git: Improve tagging script

It seems to be failing, and I'm not sure where the regression is, or if
there is a race. Sorry roidelapluie.

.ackrc

@@ -1,2 +1,3 @@
 --ignore-dir=old/
 --ignore-dir=tmp/
+--ignore-dir=vendor/

.dockerignore

@@ -0,0 +1 @@
+docker

.editorconfig

@@ -0,0 +1,19 @@
+; This file is for unifying the coding style for different editors and IDEs.
+; Plugins are available for notepad++, emacs, vim, gedit,
+; textmate, visual studio, and more.
+;
+; See http://editorconfig.org for details.
+
+# Top-most EditorConfig file.
+root = true
+
+[*]
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.go]
+indent_style = tab
+
+[Makefile]
+indent_style = tab

.github/ISSUE_TEMPLATE.md

@@ -0,0 +1,9 @@
+## Versions:
+
+* mgmt version (eg: `mgmt --version`):
+
+* operating system/distribution (eg: `uname -a`):
+
+* golang version (eg: `go version`):
+
+## Description:

.gitignore

@@ -1,9 +1,11 @@
+.idea/
 .omv/
 .ssh/
 .vagrant/
-mgmt-documentation.pdf
 old/
 tmp/
 *_stringer.go
 mgmt
+mgmt.static
+mgmt.iml
 rpmbuild/

.gitmodules

@@ -0,0 +1,18 @@
+[submodule "vendor/github.com/coreos/etcd"]
+	path = vendor/github.com/coreos/etcd
+	url = https://github.com/coreos/etcd/
+[submodule "vendor/google.golang.org/grpc"]
+	path = vendor/google.golang.org/grpc
+	url = https://github.com/grpc/grpc-go
+[submodule "vendor/github.com/grpc-ecosystem/grpc-gateway"]
+	path = vendor/github.com/grpc-ecosystem/grpc-gateway
+	url = https://github.com/grpc-ecosystem/grpc-gateway
+[submodule "vendor/gopkg.in/fsnotify.v1"]
+	path = vendor/gopkg.in/fsnotify.v1
+	url = https://gopkg.in/fsnotify.v1
+[submodule "vendor/github.com/purpleidea/go-systemd"]
+	path = vendor/github.com/purpleidea/go-systemd
+	url = https://github.com/purpleidea/go-systemd
+[submodule "vendor/honnef.co/go/augeas"]
+	path = vendor/honnef.co/go/augeas
+	url = https://github.com/dominikh/go-augeas/

.travis.yml

@@ -1,15 +1,22 @@
 language: go
 go:
-  - 1.4.3
+  - 1.6.x
-  - 1.5.2
+  - 1.7.x
+  - 1.8.x
   - tip
+go_import_path: github.com/purpleidea/mgmt
+sudo: true
 dist: trusty
-sudo: required
+before_install:
+  - sudo apt update
+  - git fetch --unshallow
 install: 'make deps'
 script: 'make test'
 matrix:
+  fast_finish: true
   allow_failures:
     - go: tip
+    - go: 1.8.x
 notifications:
   irc:
     channels:
@@ -22,4 +29,7 @@ notifications:
     use_notice: false
     skip_join: false
   email:
+    recipients:
       - travis-ci@shubin.ca
+    on_failure: change
+    on_success: change

AUTHORS

@@ -4,4 +4,7 @@ If you appreciate the work of one of the contributors, thank them a beverage!
 For a more exhaustive list please run: git log --format='%aN' | sort -u
 This list is sorted alphabetically by first name.
 
+Felix Frank
 James Shubin
+Julien Pivotto
+Paul Morgan

COPYRIGHT

@@ -1,5 +1,5 @@
 Mgmt
-Copyright (C) 2013-2016+ James Shubin and the project contributors
+Copyright (C) 2013-2017+ James Shubin and the project contributors
 Written by James Shubin <james@shubin.ca> and the project contributors
 
 This program is free software: you can redistribute it and/or modify

DOCUMENTATION.md

@@ -1,143 +0,0 @@
-#mgmt
-
-<!--
-Mgmt
-Copyright (C) 2013-2016+ James Shubin and the project contributors
-Written by James Shubin <james@shubin.ca> and the project contributors
-
-This program is free software: you can redistribute it and/or modify
-it under the terms of the GNU Affero General Public License as published by
-the Free Software Foundation, either version 3 of the License, or
-(at your option) any later version.
-
-This program is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-GNU Affero General Public License for more details.
-
-You should have received a copy of the GNU Affero General Public License
-along with this program.  If not, see <http://www.gnu.org/licenses/>.
--->
-
-##mgmt by [James](https://ttboj.wordpress.com/)
-####Available from:
-####[https://github.com/purpleidea/mgmt/](https://github.com/purpleidea/mgmt/)
-
-####This documentation is available in: [Markdown](https://github.com/purpleidea/mgmt/blob/master/DOCUMENTATION.md) or [PDF](https://pdfdoc-purpleidea.rhcloud.com/pdf/https://github.com/purpleidea/mgmt/blob/master/DOCUMENTATION.md) format.
-
-####Table of Contents
-
-1. [Overview](#overview)
-2. [Project description - What the project does](#project-description)
-3. [Setup - Getting started with mgmt](#setup)
-4. [Usage/FAQ - Notes on usage and frequently asked questions](#usage-and-frequently-asked-questions)
-5. [Reference - Detailed reference](#reference)
-	* [graph.yaml](#graph.yaml)
-	* [Command line](#command-line)
-6. [Examples - Example configurations](#examples)
-7. [Development - Background on module development and reporting bugs](#development)
-8. [Authors - Authors and contact information](#authors)
-
-##Overview
-
-The `mgmt` tool is a research prototype to demonstrate next generation config
-management techniques. Hopefully it will evolve into a useful, robust tool.
-
-##Project Description
-
-The mgmt tool is a distributed, event driven, config management tool, that
-supports parallel execution, and librarification to be used as the management
-foundation in and for, new and existing software.
-
-##Setup
-
-During this prototype phase, the tool can be run out of the source directory.
-You'll probably want to use ```./run.sh run --file examples/graph1.yaml``` to
-get started. Beware that this _can_ cause data loss. Understand what you're
-doing first, or perform these actions in a virtual environment such as the one
-provided by [Oh-My-Vagrant](https://github.com/purpleidea/oh-my-vagrant).
-
-##Usage and frequently asked questions
-(Send your questions as a patch to this FAQ! I'll review it, merge it, and
-respond by commit with the answer.)
-
-###Why did you start this project?
-
-I wanted a next generation config management solution that didn't have all of
-the design flaws or limitations that the current generation of tools do, and no
-tool existed!
-
-###Why did you use etcd? What about consul?
-
-Etcd and consul are both written in golang, which made them the top two
-contenders for my prototype. Ultimately a choice had to be made, and etcd was
-chosen, but it was also somewhat arbitrary. If there is available interest,
-good reasoning, *and* patches, then we would consider either switching or
-supporting both, but this is not a high priority at this time.
-
-###You didn't answer my question, or I have a question!
-
-It's best to ask on [IRC](https://webchat.freenode.net/?channels=#mgmtconfig)
-to see if someone can help you. Once we get a big enough community going, we'll
-add a mailing list. If you don't get any response from the above, you can
-contact me through my [technical blog](https://ttboj.wordpress.com/contact/)
-and I'll do my best to help. If you have a good question, please add it as a
-patch to this documentation. I'll merge your question, and add a patch with the
-answer!
-
-##Reference
-Please note that there are a number of undocumented options. For more
-information on these options, please view the source at:
-[https://github.com/purpleidea/mgmt/](https://github.com/purpleidea/mgmt/).
-If you feel that a well used option needs documenting here, please patch it!
-
-###Overview of reference
-* [graph.yaml](#graph.yaml): Main graph definition file.
-* [Command line](#command-line): Command line parameters.
-
-###graph.yaml
-This is the compiled graph definition file. The format is currently
-undocumented, but by looking through the [examples/](https://github.com/purpleidea/mgmt/tree/master/examples)
-you can probably figure out most of it, as it's fairly intuitive.
-
-###Command line
-The main interface to the `mgmt` tool is the command line. For the most recent
-documentation, please run `mgmt --help`.
-
-####`--file <graph.yaml>`
-Point to a graph file to run.
-
-####`--converged-timeout <seconds>`
-Exit if the machine has converged for approximately this many seconds.
-
-####`--max-runtime <seconds>`
-Exit when the agent has run for approximately this many seconds. This is not
-generally recommended, but may be useful for users who know what they're doing.
-
-##Examples
-For example configurations, please consult the [examples/](https://github.com/purpleidea/mgmt/tree/master/examples) directory in the git
-source repository. It is available from:
-
-[https://github.com/purpleidea/mgmt/tree/master/examples](https://github.com/purpleidea/mgmt/tree/master/examples)
-
-##Development
-
-This is a project that I started in my free time in 2013. Development is driven
-by all of our collective patches! Dive right in, and start hacking!
-Please contact me if you'd like to invite me to speak about this at your event.
-
-You can follow along [on my technical blog](https://ttboj.wordpress.com/).
-
-To report any bugs, please file a ticket at: [https://github.com/purpleidea/mgmt/issues](https://github.com/purpleidea/mgmt/issues).
-
-##Authors
-
-Copyright (C) 2013-2016+ James Shubin and the project contributors
-
-Please see the
-[AUTHORS](https://github.com/purpleidea/mgmt/tree/master/AUTHORS) file
-for more information.
-
-* [github](https://github.com/purpleidea/)
-* [&#64;purpleidea](https://twitter.com/#!/purpleidea)
-* [https://ttboj.wordpress.com/](https://ttboj.wordpress.com/)

Makefile

@@ -1,5 +1,5 @@
 # Mgmt
-# Copyright (C) 2013-2016+ James Shubin and the project contributors
+# Copyright (C) 2013-2017+ James Shubin and the project contributors
 # Written by James Shubin <james@shubin.ca> and the project contributors
 #
 # This program is free software: you can redistribute it and/or modify
@@ -15,29 +15,71 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-SHELL = /bin/bash
+SHELL = /usr/bin/env bash
-.PHONY: all version program path deps run race build clean test format docs rpmbuild rpm srpm spec tar upload upload-sources upload-srpms upload-rpms copr
+.PHONY: all art cleanart version program path deps run race generate build clean test gofmt yamlfmt format docs rpmbuild mkdirs rpm srpm spec tar upload upload-sources upload-srpms upload-rpms copr
 .SILENT: clean
 
-SVERSION := $(shell git describe --match '[0-9]*\.[0-9]*\.[0-9]*' --tags --dirty --always)
+SVERSION := $(or $(SVERSION),$(shell git describe --match '[0-9]*\.[0-9]*\.[0-9]*' --tags --dirty --always))
-VERSION := $(shell git describe --match '[0-9]*\.[0-9]*\.[0-9]*' --tags --abbrev=0)
+VERSION := $(or $(VERSION),$(shell git describe --match '[0-9]*\.[0-9]*\.[0-9]*' --tags --abbrev=0))
-PROGRAM := $(shell basename --suffix=-$(VERSION) $(notdir $(CURDIR)))
+PROGRAM := $(shell echo $(notdir $(CURDIR)) | cut -f1 -d"-")
+OLDGOLANG := $(shell go version | grep -E 'go1.3|go1.4')
 ifeq ($(VERSION),$(SVERSION))
 	RELEASE = 1
 else
 	RELEASE = untagged
 endif
-ARCH = $(shell arch)
+ARCH = $(uname -m)
-SPEC = rpmbuild/SPECS/mgmt.spec
+SPEC = rpmbuild/SPECS/$(PROGRAM).spec
-SOURCE = rpmbuild/SOURCES/mgmt-$(VERSION).tar.bz2
+SOURCE = rpmbuild/SOURCES/$(PROGRAM)-$(VERSION).tar.bz2
-SRPM = rpmbuild/SRPMS/mgmt-$(VERSION)-$(RELEASE).src.rpm
+SRPM = rpmbuild/SRPMS/$(PROGRAM)-$(VERSION)-$(RELEASE).src.rpm
-SRPM_BASE = mgmt-$(VERSION)-$(RELEASE).src.rpm
+SRPM_BASE = $(PROGRAM)-$(VERSION)-$(RELEASE).src.rpm
-RPM = rpmbuild/RPMS/mgmt-$(VERSION)-$(RELEASE).$(ARCH).rpm
+RPM = rpmbuild/RPMS/$(PROGRAM)-$(VERSION)-$(RELEASE).$(ARCH).rpm
 USERNAME := $(shell cat ~/.config/copr 2>/dev/null | grep username | awk -F '=' '{print $$2}' | tr -d ' ')
 SERVER = 'dl.fedoraproject.org'
-REMOTE_PATH = 'pub/alt/$(USERNAME)/mgmt'
+REMOTE_PATH = 'pub/alt/$(USERNAME)/$(PROGRAM)'
+ifneq ($(GOTAGS),)
+    BUILD_FLAGS = -tags '$(GOTAGS)'
+endif
 
-all: docs
+default: build
+
+#
+#	art
+#
+art: art/mgmt_logo_default_symbol.png art/mgmt_logo_default_tall.png art/mgmt_logo_default_wide.png art/mgmt_logo_reversed_symbol.png art/mgmt_logo_reversed_tall.png art/mgmt_logo_reversed_wide.png art/mgmt_logo_white_symbol.png art/mgmt_logo_white_tall.png art/mgmt_logo_white_wide.png
+
+cleanart:
+	rm -f art/mgmt_logo_default_symbol.png art/mgmt_logo_default_tall.png art/mgmt_logo_default_wide.png art/mgmt_logo_reversed_symbol.png art/mgmt_logo_reversed_tall.png art/mgmt_logo_reversed_wide.png art/mgmt_logo_white_symbol.png art/mgmt_logo_white_tall.png art/mgmt_logo_white_wide.png
+
+# NOTE: the widths are arbitrary
+art/mgmt_logo_default_symbol.png: art/mgmt_logo_default_symbol.svg
+	inkscape --export-background='#ffffff' --without-gui --export-png "$@" --export-width 300 $(@:png=svg)
+
+art/mgmt_logo_default_tall.png: art/mgmt_logo_default_tall.svg
+	inkscape --export-background='#ffffff' --without-gui --export-png "$@" --export-width 400 $(@:png=svg)
+
+art/mgmt_logo_default_wide.png: art/mgmt_logo_default_wide.svg
+	inkscape --export-background='#ffffff' --without-gui --export-png "$@" --export-width 800 $(@:png=svg)
+
+art/mgmt_logo_reversed_symbol.png: art/mgmt_logo_reversed_symbol.svg
+	inkscape --export-background='#231f20' --without-gui --export-png "$@" --export-width 300 $(@:png=svg)
+
+art/mgmt_logo_reversed_tall.png: art/mgmt_logo_reversed_tall.svg
+	inkscape --export-background='#231f20' --without-gui --export-png "$@" --export-width 400 $(@:png=svg)
+
+art/mgmt_logo_reversed_wide.png: art/mgmt_logo_reversed_wide.svg
+	inkscape --export-background='#231f20' --without-gui --export-png "$@" --export-width 800 $(@:png=svg)
+
+art/mgmt_logo_white_symbol.png: art/mgmt_logo_white_symbol.svg
+	inkscape --export-background='#231f20' --without-gui --export-png "$@" --export-width 300 $(@:png=svg)
+
+art/mgmt_logo_white_tall.png: art/mgmt_logo_white_tall.svg
+	inkscape --export-background='#231f20' --without-gui --export-png "$@" --export-width 400 $(@:png=svg)
+
+art/mgmt_logo_white_wide.png: art/mgmt_logo_white_wide.svg
+	inkscape --export-background='#231f20' --without-gui --export-png "$@" --export-width 800 $(@:png=svg)
+
+all: docs $(PROGRAM).static
 
 # show the current version
 version:
@@ -53,39 +95,56 @@ deps:
 	./misc/make-deps.sh
 
 run:
-	find -maxdepth 1 -type f -name '*.go' -not -name '*_test.go' | xargs go run -ldflags "-X main.program=$(PROGRAM) -X main.version=$(SVERSION)"
+	find . -maxdepth 1 -type f -name '*.go' -not -name '*_test.go' | xargs go run -ldflags "-X main.program=$(PROGRAM) -X main.version=$(SVERSION)"
 
 # include race flag
 race:
-	find -maxdepth 1 -type f -name '*.go' -not -name '*_test.go' | xargs go run -race -ldflags "-X main.program=$(PROGRAM) -X main.version=$(SVERSION)"
+	find . -maxdepth 1 -type f -name '*.go' -not -name '*_test.go' | xargs go run -race -ldflags "-X main.program=$(PROGRAM) -X main.version=$(SVERSION)"
 
-build: mgmt
+generate:
-
-mgmt: main.go
-	@echo "Building: $(PROGRAM), version: $(SVERSION)."
 	go generate
-	# avoid equals sign in old golang versions eg in: -X foo=bar
+
-	if go version | grep -qE 'go1.3|go1.4'; then \
+build: $(PROGRAM)
-		go build -ldflags "-X main.program $(PROGRAM) -X main.version $(SVERSION)" -o mgmt; \
+
-	else \
+$(PROGRAM): main.go
-		go build -ldflags "-X main.program=$(PROGRAM) -X main.version=$(SVERSION)" -o mgmt; \
+	@echo "Building: $(PROGRAM), version: $(SVERSION)..."
-	fi
+ifneq ($(OLDGOLANG),)
+	@# avoid equals sign in old golang versions eg in: -X foo=bar
+	time go build -ldflags "-X main.program $(PROGRAM) -X main.version $(SVERSION)" -o $(PROGRAM) $(BUILD_FLAGS);
+else
+	time go build -i -ldflags "-X main.program=$(PROGRAM) -X main.version=$(SVERSION)" -o $(PROGRAM) $(BUILD_FLAGS);
+endif
+
+$(PROGRAM).static: main.go
+	@echo "Building: $(PROGRAM).static, version: $(SVERSION)..."
+	go generate
+ifneq ($(OLDGOLANG),)
+	@# avoid equals sign in old golang versions eg in: -X foo=bar
+	go build -a -installsuffix cgo -tags netgo -ldflags '-extldflags "-static" -X main.program $(PROGRAM) -X main.version $(SVERSION)' -o $(PROGRAM).static $(BUILD_FLAGS);
+else
+	go build -a -installsuffix cgo -tags netgo -ldflags '-extldflags "-static" -X main.program=$(PROGRAM) -X main.version=$(SVERSION)' -o $(PROGRAM).static $(BUILD_FLAGS);
+endif
 
 clean:
-	[ ! -e mgmt ] || rm mgmt
+	[ ! -e $(PROGRAM) ] || rm $(PROGRAM)
 	rm -f *_stringer.go	# generated by `go generate`
+	rm -f *_mock.go		# generated by `go generate`
 
 test:
 	./test.sh
 
-format:
+gofmt:
-	find -type f -name '*.go' -not -path './old/*' -not -path './tmp/*' -exec gofmt -w {} \;
+	find . -maxdepth 3 -type f -name '*.go' -not -path './old/*' -not -path './tmp/*' -exec gofmt -w {} \;
-	find -type f -name '*.yaml' -not -path './old/*' -not -path './tmp/*' -not -path './omv.yaml' -exec ruby -e "require 'yaml'; x=YAML.load_file('{}').to_yaml.each_line.map(&:rstrip).join(10.chr)+10.chr; File.open('{}', 'w').write x" \;
 
-docs: mgmt-documentation.pdf
+yamlfmt:
+	find . -maxdepth 3 -type f -name '*.yaml' -not -path './old/*' -not -path './tmp/*' -not -path './omv.yaml' -exec ruby -e "require 'yaml'; x=YAML.load_file('{}').to_yaml.each_line.map(&:rstrip).join(10.chr)+10.chr; File.open('{}', 'w').write x" \;
 
-mgmt-documentation.pdf: DOCUMENTATION.md
+format: gofmt yamlfmt
-	pandoc DOCUMENTATION.md -o 'mgmt-documentation.pdf'
+
+docs: $(PROGRAM)-documentation.pdf
+
+$(PROGRAM)-documentation.pdf: docs/documentation.md
+	pandoc docs/documentation.md -o docs/'$(PROGRAM)-documentation.pdf'
 
 #
 #	build aliases
@@ -116,21 +175,21 @@ upload: upload-sources upload-srpms upload-rpms
 $(RPM): $(SPEC) $(SOURCE)
 	@echo Running rpmbuild -bb...
 	rpmbuild --define '_topdir $(shell pwd)/rpmbuild' -bb $(SPEC) && \
-	mv rpmbuild/RPMS/$(ARCH)/mgmt-$(VERSION)-$(RELEASE).*.rpm $(RPM)
+	mv rpmbuild/RPMS/$(ARCH)/$(PROGRAM)-$(VERSION)-$(RELEASE).*.rpm $(RPM)
 
 $(SRPM): $(SPEC) $(SOURCE)
 	@echo Running rpmbuild -bs...
 	rpmbuild --define '_topdir $(shell pwd)/rpmbuild' -bs $(SPEC)
 	# renaming is not needed because we aren't using the dist variable
-	#mv rpmbuild/SRPMS/mgmt-$(VERSION)-$(RELEASE).*.src.rpm $(SRPM)
+	#mv rpmbuild/SRPMS/$(PROGRAM)-$(VERSION)-$(RELEASE).*.src.rpm $(SRPM)
 
 #
 #	spec
 #
-$(SPEC): rpmbuild/ mgmt.spec.in
+$(SPEC): rpmbuild/ spec.in
 	@echo Running templater...
-	#cat mgmt.spec.in > $(SPEC)
+	cat spec.in > $(SPEC)
-	sed -e s/__VERSION__/$(VERSION)/ -e s/__RELEASE__/$(RELEASE)/ < mgmt.spec.in > $(SPEC)
+	sed -e s/__PROGRAM__/$(PROGRAM)/g -e s/__VERSION__/$(VERSION)/g -e s/__RELEASE__/$(RELEASE)/g < spec.in > $(SPEC)
 	# append a changelog to the .spec file
 	git log --format="* %cd %aN <%aE>%n- (%h) %s%d%n" --date=local | sed -r 's/[0-9]+:[0-9]+:[0-9]+ //' >> $(SPEC)
 
@@ -140,7 +199,7 @@ $(SPEC): rpmbuild/ mgmt.spec.in
 $(SOURCE): rpmbuild/
 	@echo Running git archive...
 	# use HEAD if tag doesn't exist yet, so that development is easier...
-	git archive --prefix=mgmt-$(VERSION)/ -o $(SOURCE) $(VERSION) 2> /dev/null || (echo 'Warning: $(VERSION) does not exist. Using HEAD instead.' && git archive --prefix=mgmt-$(VERSION)/ -o $(SOURCE) HEAD)
+	git archive --prefix=$(PROGRAM)-$(VERSION)/ -o $(SOURCE) $(VERSION) 2> /dev/null || (echo 'Warning: $(VERSION) does not exist. Using HEAD instead.' && git archive --prefix=$(PROGRAM)-$(VERSION)/ -o $(SOURCE) HEAD)
 	# TODO: if git archive had a --submodules flag this would easier!
 	@echo Running git archive submodules...
 	# i thought i would need --ignore-zeros, but it doesn't seem necessary!
@@ -149,14 +208,14 @@ $(SOURCE): rpmbuild/
 		temp="$${temp#\'}"; \
 		path=$$temp; \
 		[ "$$path" = "" ] && continue; \
-		(cd $$path && git archive --prefix=mgmt-$(VERSION)/$$path/ HEAD > $$p/rpmbuild/tmp.tar && tar --concatenate --file=$$p/$(SOURCE) $$p/rpmbuild/tmp.tar && rm $$p/rpmbuild/tmp.tar); \
+		(cd $$path && git archive --prefix=$(PROGRAM)-$(VERSION)/$$path/ HEAD > $$p/rpmbuild/tmp.tar && tar --concatenate --file=$$p/$(SOURCE) $$p/rpmbuild/tmp.tar && rm $$p/rpmbuild/tmp.tar); \
 	done
 
 # TODO: ensure that each sub directory exists
 rpmbuild/:
 	mkdir -p rpmbuild/{BUILD,BUILDROOT,RPMS,SOURCES,SPECS,SRPMS}
 
-rpmbuild:
+mkdirs:
 	mkdir -p rpmbuild/{BUILD,BUILDROOT,RPMS,SOURCES,SPECS,SRPMS}
 
 #

README.md

@@ -1,65 +1,83 @@
-# *mgmt*: This is: mgmt!
+# *mgmt*: next generation config management!
 
-[![Build Status](https://secure.travis-ci.org/purpleidea/mgmt.png?branch=master)](http://travis-ci.org/purpleidea/mgmt)
+[![mgmt!](art/mgmt.png)](art/)
-[![Documentation](https://img.shields.io/docs/markdown.png)](DOCUMENTATION.md)
+
-[![IRC](https://img.shields.io/irc/%23mgmtconfig.png)](https://webchat.freenode.net/?channels=#mgmtconfig)
+[![Go Report Card](https://goreportcard.com/badge/github.com/purpleidea/mgmt?style=flat-square)](https://goreportcard.com/report/github.com/purpleidea/mgmt)
-[![Jenkins](https://img.shields.io/jenkins/status.png)](https://ci.centos.org/job/purpleidea-mgmt/)
+[![Build Status](https://img.shields.io/travis/purpleidea/mgmt/master.svg?style=flat-square)](http://travis-ci.org/purpleidea/mgmt)
-[![COPR](https://img.shields.io/copr/builds.png)](https://copr.fedoraproject.org/coprs/purpleidea/mgmt/)
+[![GoDoc](https://img.shields.io/badge/godoc-reference-5272B4.svg?style=flat-square)](https://godoc.org/github.com/purpleidea/mgmt)
+[![IRC](https://img.shields.io/badge/irc-%23mgmtconfig-brightgreen.svg?style=flat-square)](https://webchat.freenode.net/?channels=#mgmtconfig)
+[![Jenkins](https://img.shields.io/badge/jenkins-status-brightgreen.svg?style=flat-square)](https://ci.centos.org/job/purpleidea-mgmt/)
 
 ## Community:
-Come join us on IRC in [#mgmtconfig](https://webchat.freenode.net/?channels=#mgmtconfig) on Freenode!
+Come join us in the `mgmt` community!
-You may like the [#mgmtconfig](https://twitter.com/hashtag/mgmtconfig) hashtag if you're on [Twitter](https://twitter.com/#!/purpleidea).
 
-## Questions:
+| Medium | Link |
-Please join the [#mgmtconfig](https://webchat.freenode.net/?channels=#mgmtconfig) IRC community!
+|---|---|---|
-If you have a well phrased question that might benefit others, consider asking it by sending a patch to the documentation [FAQ](https://github.com/purpleidea/mgmt/blob/master/DOCUMENTATION.md#usage-and-frequently-asked-questions) section. I'll merge your question, and a patch with the answer!
+| IRC | [#mgmtconfig](https://webchat.freenode.net/?channels=#mgmtconfig) on Freenode |
+| Twitter | [@mgmtconfig](https://twitter.com/mgmtconfig) & [#mgmtconfig](https://twitter.com/hashtag/mgmtconfig) |
+| Mailing list | [mgmtconfig-list@redhat.com](https://www.redhat.com/mailman/listinfo/mgmtconfig-list) |
 
-## Quick start:
+## Status:
-* Either get the golang dependencies on your own, or run `make deps` if you're comfortable with how we install them.
+Mgmt is a fairly new project.
-* Run `make build` to get a fresh built `mgmt` binary.
+We're working towards being minimally useful for production environments.
-* Run `cd $(mktemp --tmpdir -d tmp.XXX) && etcd` to get etcd running. The `mgmt` software will do this automatically for you in the future.
+We aren't feature complete for what we'd consider a 1.x release yet.
-* Run `time ./mgmt run --file examples/graph0.yaml --converged-timeout=1` to try out a very simple example!
+With your help you'll be able to influence our design and get us there sooner!
-* To run continuously in the default mode of operation, omit the `--converged-timeout` option.
-* Have fun hacking on our future technology!
-
-## Examples:
-Please look in the [examples/](examples/) folder for more examples!
 
 ## Documentation:
-Please see: [DOCUMENTATION.md](DOCUMENTATION.md) or [PDF](https://pdfdoc-purpleidea.rhcloud.com/pdf/https://github.com/purpleidea/mgmt/blob/master/DOCUMENTATION.md).
+Please read, enjoy and help improve our documentation!
+
+| Documentation | Additional Notes |
+|---|---|
+| [general documentation](docs/documentation.md) | for everyone |
+| [quick start guide](docs/quick-start-guide.md) | for mgmt developers |
+| [resource guide](docs/resource-guide.md) | for mgmt developers |
+| [godoc API reference](https://godoc.org/github.com/purpleidea/mgmt) | for mgmt developers |
+| [prometheus guide](docs/prometheus.md) | for everyone |
+| [puppet guide](docs/puppet-guide.md) | for puppet sysadmins |
+
+## Questions:
+Please ask in the [community](#community)!
+If you have a well phrased question that might benefit others, consider asking it by sending a patch to the documentation [FAQ](https://github.com/purpleidea/mgmt/blob/master/docs/documentation.md#usage-and-frequently-asked-questions) section. I'll merge your question, and a patch with the answer!
 
 ## Roadmap:
 Please see: [TODO.md](TODO.md) for a list of upcoming work and TODO items.
 Please get involved by working on one of these items or by suggesting something else!
+Feel free to grab one of the straightforward [#mgmtlove](https://github.com/purpleidea/mgmt/labels/mgmtlove) issues if you're a first time contributor to the project or if you're unsure about what to hack on!
 
 ## Bugs:
 Please set the `DEBUG` constant in [main.go](https://github.com/purpleidea/mgmt/blob/master/main.go) to `true`, and post the logs when you report the [issue](https://github.com/purpleidea/mgmt/issues).
 Bonus points if you provide a [shell](https://github.com/purpleidea/mgmt/tree/master/test/shell) or [OMV](https://github.com/purpleidea/mgmt/tree/master/test/omv) reproducible test case.
-
+Feel free to read my article on [debugging golang programs](https://ttboj.wordpress.com/2016/02/15/debugging-golang-programs/).
-## Dependencies:
-* golang 1.4 or higher (required, available in most distros)
-* golang libraries (required, available with `go get`)
-
-        go get github.com/coreos/etcd/client
-        go get gopkg.in/yaml.v2
-        go get gopkg.in/fsnotify.v1
-        go get github.com/codegangsta/cli
-        go get github.com/coreos/go-systemd/dbus
-        go get github.com/coreos/go-systemd/util
-
-* stringer (required for building), available as a package on some platforms, otherwise via `go get`
-
-        go get golang.org/x/tools/cmd/stringer
-
-* pandoc (optional, for building a pdf of the documentation)
-* graphviz (optional, for building a visual representation of the graph)
 
 ## Patches:
 We'd love to have your patches! Please send them by email, or as a pull request.
 
 ## On the web:
-* Introductory blog post: [https://ttboj.wordpress.com/2016/01/18/next-generation-configuration-mgmt/](https://ttboj.wordpress.com/2016/01/18/next-generation-configuration-mgmt/)
+| Author | Format | Subject |
-* Julian Dunn at Cfgmgmtcamp 2016 [https://www.youtube.com/watch?v=kfF9IATUask&t=1949&html5=1](https://www.youtube.com/watch?v=kfF9IATUask&t=1949&html5=1)
+|---|---|---|
+| James Shubin | blog | [Next generation configuration mgmt](https://ttboj.wordpress.com/2016/01/18/next-generation-configuration-mgmt/) |
+| James Shubin | video | [Introductory recording from DevConf.cz 2016](https://www.youtube.com/watch?v=GVhpPF0j-iE&html5=1) |
+| James Shubin | video | [Introductory recording from CfgMgmtCamp.eu 2016](https://www.youtube.com/watch?v=fNeooSiIRnA&html5=1) |
+| Julian Dunn | video | [On mgmt at CfgMgmtCamp.eu 2016](https://www.youtube.com/watch?v=kfF9IATUask&t=1949&html5=1) |
+| Walter Heck | slides | [On mgmt at CfgMgmtCamp.eu 2016](http://www.slideshare.net/olindata/configuration-management-time-for-a-4th-generation/3) |
+| Marco Marongiu | blog | [On mgmt](http://syslog.me/2016/02/15/leap-or-die/) |
+| Felix Frank | blog | [From Catalog To Mgmt (on puppet to mgmt "transpiling")](https://ffrank.github.io/features/2016/02/18/from-catalog-to-mgmt/) |
+| James Shubin | blog | [Automatic edges in mgmt (...and the pkg resource)](https://ttboj.wordpress.com/2016/03/14/automatic-edges-in-mgmt/) |
+| James Shubin | blog | [Automatic grouping in mgmt](https://ttboj.wordpress.com/2016/03/30/automatic-grouping-in-mgmt/) |
+| John Arundel | tweet | [“Puppet’s days are numbered.”](https://twitter.com/bitfield/status/732157519142002688) |
+| Felix Frank | blog | [Puppet, Meet Mgmt (on puppet to mgmt internals)](https://ffrank.github.io/features/2016/06/12/puppet,-meet-mgmt/) |
+| Felix Frank | blog | [Puppet Powered Mgmt (puppet to mgmt tl;dr)](https://ffrank.github.io/features/2016/06/19/puppet-powered-mgmt/) |
+| James Shubin | blog | [Automatic clustering in mgmt](https://ttboj.wordpress.com/2016/06/20/automatic-clustering-in-mgmt/) |
+| James Shubin | video | [Recording from CoreOSFest 2016](https://www.youtube.com/watch?v=KVmDCUA42wc&html5=1) |
+| James Shubin | video | [Recording from DebConf16](http://meetings-archive.debian.net/pub/debian-meetings/2016/debconf16/Next_Generation_Config_Mgmt.webm) ([Slides](https://annex.debconf.org//debconf-share/debconf16/slides/15-next-generation-config-mgmt.pdf)) |
+| Felix Frank | blog | [Edging It All In (puppet and mgmt edges)](https://ffrank.github.io/features/2016/07/12/edging-it-all-in/) |
+| Felix Frank | blog | [Translating All The Things (puppet to mgmt translation warnings)](https://ffrank.github.io/features/2016/08/19/translating-all-the-things/) |
+| James Shubin | video | [Recording from systemd.conf 2016](https://www.youtube.com/watch?v=jB992Zb3nH0&html5=1) |
+| James Shubin | blog | [Remote execution in mgmt](https://ttboj.wordpress.com/2016/10/07/remote-execution-in-mgmt/) |
+| James Shubin | video | [Recording from High Load Strategy 2016](https://vimeo.com/191493409) |
+| James Shubin | video | [Recording from NLUUG 2016](https://www.youtube.com/watch?v=MmpwOQAb_SE&html5=1) |
+| James Shubin | blog | [Send/Recv in mgmt](https://ttboj.wordpress.com/2016/12/07/sendrecv-in-mgmt/) |
+| James Shubin | blog | [Metaparameters in mgmt](https://ttboj.wordpress.com/2017/03/01/metaparameters-in-mgmt/) |
 
 ##
 

THANKS

@@ -9,10 +9,16 @@ Chris Wright - For encouraging me to continue work on my prototype.
 
 Daniel Riek - For supporting and sheltering this project from bureaucracy.
 
+Diego Ongaro - For good chats, particularly around distributed systems.
+
+Felix Frank - For taking a difficult problem and building an inspiring solution.
+
 Ira Cooper - For having an algorithmic design discussion with me.
 
 Jeff Darcy - For some algorithm recommendations, and NACKing my TopoSort idea!
 
 Red Hat, inc. - For paying my salary, thus financially supporting my hacking.
 
+Samuel Gélineau - For help with programming language theory and design.
+
 And many others...

TODO.md

@@ -3,27 +3,54 @@ If you're looking for something to do, look here!
 Let us know if you're working on one of the items.
 
 ## Package resource
-- [ ] base type [bug](https://github.com/purpleidea/mgmt/issues/11)
+- [ ] getfiles support on debian [bug](https://github.com/hughsie/PackageKit/issues/118)
+- [ ] directory info on fedora [bug](https://github.com/hughsie/PackageKit/issues/117)
 - [ ] dnf blocker [bug](https://github.com/hughsie/PackageKit/issues/110)
 - [ ] install signal blocker [bug](https://github.com/hughsie/PackageKit/issues/109)
 
-## File resource
+## File resource [bug](https://github.com/purpleidea/mgmt/issues/64) [:heart:](https://github.com/purpleidea/mgmt/labels/mgmtlove)
-- [ ] ability to make/delete folders
+- [ ] chown/chmod support [:heart:](https://github.com/purpleidea/mgmt/labels/mgmtlove)
-- [ ] recursive argument (can recursively watch/modify contents)
+- [ ] user/group support [:heart:](https://github.com/purpleidea/mgmt/labels/mgmtlove)
-- [ ] force argument (can cause switch from file <-> folder)
+- [ ] recurse limit support [:heart:](https://github.com/purpleidea/mgmt/labels/mgmtlove)
 - [ ] fanotify support [bug](https://github.com/go-fsnotify/fsnotify/issues/114)
 
+## Svc resource
+- [ ] base resource improvements
+
 ## Exec resource
 - [ ] base resource improvements
 
 ## Timer resource
+- [ ] increment algorithm (linear, exponential, etc...) [:heart:](https://github.com/purpleidea/mgmt/labels/mgmtlove)
+
+## User/Group resource
+- [ ] base resource [:heart:](https://github.com/purpleidea/mgmt/labels/mgmtlove)
+- [ ] automatic edges to file resource [:heart:](https://github.com/purpleidea/mgmt/labels/mgmtlove)
+
+## Virt (libvirt) resource
+- [ ] base resource improvements [:heart:](https://github.com/purpleidea/mgmt/labels/mgmtlove)
+- [ ] port to upstream https://github.com/libvirt/libvirt-go [:heart:](https://github.com/purpleidea/mgmt/labels/mgmtlove)
+
+## Net (systemd-networkd) resource
 - [ ] base resource
-- [ ] reset on recompile
+
-- [ ] increment algorithm (linear, exponential, etc...)
+## Nspawn (systemd-nspawn) resource
+- [ ] base resource [:heart:](https://github.com/purpleidea/mgmt/labels/mgmtlove)
+
+## Mount (systemd-mount) resource
+- [ ] base resource [:heart:](https://github.com/purpleidea/mgmt/labels/mgmtlove)
+
+## Cron (systemd-timer) resource
+- [ ] base resource [:heart:](https://github.com/purpleidea/mgmt/labels/mgmtlove)
+
+## Http resource
+- [ ] base resource [:heart:](https://github.com/purpleidea/mgmt/labels/mgmtlove)
 
 ## Etcd improvements
-- [ ] embedded etcd master
+- [ ] fix embedded etcd master race
-- [ ] capnslog fixes [bug](https://github.com/coreos/etcd/issues/4115)
+
+## Torrent/dht file transfer
+- [ ] base plumbing
 
 ## Language improvements
 - [ ] language design
@@ -35,9 +62,6 @@ Let us know if you're working on one of the items.
 
 ## Other
 - [ ] better error/retry handling
-- [ ] resource grouping
-- [ ] automatic dependency adding (eg: packagekit file dependencies)
-- [ ] rpm package target in Makefile
 - [ ] deb package target in Makefile
 - [ ] reproducible builds
 - [ ] add your suggestions!

Vagrantfile

@@ -0,0 +1,38 @@
+Vagrant.configure(2) do |config|
+	config.ssh.forward_agent = true
+	config.ssh.username = 'vagrant'
+	config.vm.network "private_network", ip: "192.168.219.2"
+
+	config.vm.synced_folder ".", "/vagrant", disabled: true
+
+	config.vm.define "mgmt-dev" do |instance|
+		instance.vm.box = "fedora/24-cloud-base"
+	end
+
+	config.vm.provider "virtualbox" do |v|
+		v.memory = 1536
+		v.cpus = 2
+	end
+
+	config.vm.provision "file", source: "vagrant/motd", destination: ".motd"
+	config.vm.provision "shell", inline: "cp ~vagrant/.motd /etc/motd"
+
+	config.vm.provision "file", source: "vagrant/mgmt.bashrc", destination: ".mgmt.bashrc"
+	config.vm.provision "file", source: "~/.gitconfig", destination: ".gitconfig"
+
+	# copied from make-deps.sh (with added git)
+	config.vm.provision "shell", inline: "dnf install -y libvirt-devel golang golang-googlecode-tools-stringer hg git"
+
+	# set up vagrant home
+	script = <<-SCRIPT
+		grep -q 'mgmt\.bashrc' ~/.bashrc || echo '. ~/.mgmt.bashrc' >>~/.bashrc
+		. ~/.mgmt.bashrc
+		go get -u github.com/purpleidea/mgmt
+		cd ~/gopath/src/github.com/purpleidea/mgmt
+		make deps
+	SCRIPT
+	config.vm.provision "shell" do |shell|
+		shell.privileged = false
+		shell.inline = script
+	end
+end

art/.gitignore

@@ -0,0 +1,2 @@
+*.png
+misc/

art/mgmt_logo_default_symbol.svg

@@ -0,0 +1,94 @@
+<?xml version="1.0" encoding="utf-8"?>
+<svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
+	 viewBox="0 0 120 107.1" style="enable-background:new 0 0 120 107.1;" xml:space="preserve">
+<style type="text/css">
+	.st0{fill:#FFFFFF;}
+	.st1{fill:#E22434;}
+	.st2{display:none;}
+	.st3{fill:#1B3663;}
+	.st4{fill:#00B1D1;}
+	.st5{fill:#BFE6EF;}
+	.st6{fill:#69CBE0;}
+	.st7{fill:#0080BD;}
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+	.st9{fill:#183660;}
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+</style>
+<g id="Layer_2">
+</g>
+<g id="Layer_1">
+	<g>
+		<g>
+			<g>
+				<line class="st10" x1="29.2" y1="24.1" x2="52.1" y2="42.8"/>
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+				</g>
+			</g>
+		</g>
+		<circle class="st5" cx="16.1" cy="12.2" r="12.1"/>
+		<g>
+			<g>
+				<line class="st10" x1="52.1" y1="42.1" x2="74.1" y2="80"/>
+				<g>
+					<polygon class="st9" points="70.1,80.9 76.9,84.8 76.8,77.1 					"/>
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+			</g>
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+		<g>
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+				<g>
+					<polygon class="st9" points="69.7,50.7 63.9,45.6 71.3,43.2 					"/>
+				</g>
+			</g>
+		</g>
+		<g>
+			<g>
+				<line class="st10" x1="52.1" y1="42.8" x2="71.9" y2="30.1"/>
+				<g>
+					<polygon class="st9" points="73.1,34 76.6,27.1 68.9,27.5 					"/>
+				</g>
+			</g>
+		</g>
+		<g>
+			<g>
+				<line class="st10" x1="16.8" y1="49.6" x2="34.8" y2="46.5"/>
+				<g>
+					<polygon class="st9" points="34.3,50.5 40.3,45.6 33,42.9 					"/>
+				</g>
+			</g>
+		</g>
+		<g>
+			<g>
+				<line class="st10" x1="92.3" y1="79.5" x2="107.8" y2="54.2"/>
+				<g>
+					<polygon class="st9" points="96.1,80.6 89.3,84.3 89.5,76.5 					"/>
+				</g>
+			</g>
+		</g>
+		<g>
+			<g>
+				<line class="st10" x1="97.3" y1="36.5" x2="107.8" y2="54.2"/>
+				<g>
+					<polygon class="st9" points="94.6,39.4 94.5,31.7 101.2,35.5 					"/>
+				</g>
+			</g>
+		</g>
+		<circle class="st3" cx="52.1" cy="42.8" r="12.1"/>
+		<circle class="st4" cx="12.2" cy="50.8" r="12.1"/>
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+		<circle class="st6" cx="107.8" cy="54.2" r="12.1"/>
+	</g>
+</g>
+</svg>

art/mgmt_logo_default_tall.svg

@@ -0,0 +1,132 @@
+<?xml version="1.0" encoding="utf-8"?>
+<svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
+	 viewBox="0 0 168.3 131.6" style="enable-background:new 0 0 168.3 131.6;" xml:space="preserve">
+<style type="text/css">
+	.st0{fill:#FFFFFF;}
+	.st1{fill:#E22434;}
+	.st2{display:none;}
+	.st3{fill:#1B3663;}
+	.st4{fill:#00B1D1;}
+	.st5{fill:#BFE6EF;}
+	.st6{fill:#69CBE0;}
+	.st7{fill:#0080BD;}
+	.st8{fill:#005DAB;}
+	.st9{fill:#183660;}
+	.st10{fill:none;stroke:#183660;stroke-width:1.9441;stroke-miterlimit:10;}
+	.st11{fill:none;stroke:#183660;stroke-width:1.6201;stroke-miterlimit:10;}
+	.st12{fill:none;stroke:#183660;stroke-width:1.2961;stroke-miterlimit:10;}
+	.st13{fill:none;stroke:#C0E6EF;stroke-width:1.9441;stroke-miterlimit:10;}
+	.st14{fill:#C0E6EF;}
+	.st15{fill:none;stroke:#C0E6EF;stroke-width:1.2961;stroke-miterlimit:10;}
+	.st16{fill:none;stroke:#C0E6EF;stroke-width:1.6201;stroke-miterlimit:10;}
+	.st17{fill:none;stroke:#FFFFFF;stroke-width:1.9441;stroke-miterlimit:10;}
+	.st18{fill:none;stroke:#FFFFFF;stroke-width:1.2961;stroke-miterlimit:10;}
+	.st19{fill:none;stroke:#FFFFFF;stroke-width:1.6201;stroke-miterlimit:10;}
+</style>
+<g id="Layer_2">
+</g>
+<g id="Layer_1">
+	<g>
+		<g>
+			<g>
+				<path class="st3" d="M4.7,105l0.1,1.8c1.1-1.4,2.6-2.1,4.4-2.1c1.9,0,3.2,0.9,4,2.6c1.1-1.7,2.6-2.6,4.7-2.6
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art/mgmt_logo_reversed_symbol.svg

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art/mgmt_logo_reversed_tall.svg

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art/mgmt_logo_reversed_wide.svg

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art/mgmt_logo_white_symbol.svg

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art/mgmt_logo_white_tall.svg

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+			<circle class="st0" cx="124.4" cy="45.2" r="10.1"/>
+		</g>
+	</g>
+</g>
+</svg>

art/mgmt_logo_white_wide.svg

@@ -0,0 +1,132 @@
+<?xml version="1.0" encoding="utf-8"?>
+<svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
+	 viewBox="0 0 260.4 71.4" style="enable-background:new 0 0 260.4 71.4;" xml:space="preserve">
+<style type="text/css">
+	.st0{fill:#FFFFFF;}
+	.st1{fill:#E22434;}
+	.st2{display:none;}
+	.st3{fill:#1B3663;}
+	.st4{fill:#00B1D1;}
+	.st5{fill:#BFE6EF;}
+	.st6{fill:#69CBE0;}
+	.st7{fill:#0080BD;}
+	.st8{fill:#005DAB;}
+	.st9{fill:#183660;}
+	.st10{fill:none;stroke:#183660;stroke-width:1.9441;stroke-miterlimit:10;}
+	.st11{fill:none;stroke:#183660;stroke-width:1.6201;stroke-miterlimit:10;}
+	.st12{fill:none;stroke:#183660;stroke-width:1.2961;stroke-miterlimit:10;}
+	.st13{fill:none;stroke:#C0E6EF;stroke-width:1.9441;stroke-miterlimit:10;}
+	.st14{fill:#C0E6EF;}
+	.st15{fill:none;stroke:#C0E6EF;stroke-width:1.2961;stroke-miterlimit:10;}
+	.st16{fill:none;stroke:#C0E6EF;stroke-width:1.6201;stroke-miterlimit:10;}
+	.st17{fill:none;stroke:#FFFFFF;stroke-width:1.9441;stroke-miterlimit:10;}
+	.st18{fill:none;stroke:#FFFFFF;stroke-width:1.2961;stroke-miterlimit:10;}
+	.st19{fill:none;stroke:#FFFFFF;stroke-width:1.6201;stroke-miterlimit:10;}
+</style>
+<g id="Layer_2">
+</g>
+<g id="Layer_1">
+	<g>
+		<g>
+			<g>
+				<path class="st0" d="M96.7,26l0.1,1.8c1.1-1.4,2.6-2.1,4.4-2.1c1.9,0,3.2,0.9,4,2.6c1.1-1.7,2.6-2.6,4.7-2.6
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+				<path class="st0" d="M240.1,20.5c0-0.4,0.1-0.7,0.3-1s0.5-0.4,0.9-0.4s0.7,0.1,1,0.4s0.3,0.6,0.3,1s-0.1,0.7-0.3,1
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+				</g>
+			</g>
+			<circle class="st0" cx="34.7" cy="28.5" r="8.1"/>
+			<circle class="st0" cx="8.1" cy="33.9" r="8.1"/>
+			<circle class="st0" cx="58.3" cy="14.5" r="8.1"/>
+			<circle class="st0" cx="55.7" cy="63.3" r="8.1"/>
+			<circle class="st0" cx="71.9" cy="36.1" r="8.1"/>
+		</g>
+	</g>
+</g>
+</svg>

config.go

@@ -1,229 +0,0 @@
-// Mgmt
-// Copyright (C) 2013-2016+ James Shubin and the project contributors
-// Written by James Shubin <james@shubin.ca> and the project contributors
-//
-// This program is free software: you can redistribute it and/or modify
-// it under the terms of the GNU Affero General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-//
-// This program is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-// GNU Affero General Public License for more details.
-//
-// You should have received a copy of the GNU Affero General Public License
-// along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
-package main
-
-import (
-	"errors"
-	"gopkg.in/yaml.v2"
-	"io/ioutil"
-	"log"
-	"strings"
-)
-
-type collectorTypeConfig struct {
-	Type    string `yaml:"type"`
-	Pattern string `yaml:"pattern"` // XXX: Not Implemented
-}
-
-type vertexConfig struct {
-	Type string `yaml:"type"`
-	Name string `yaml:"name"`
-}
-
-type edgeConfig struct {
-	Name string       `yaml:"name"`
-	From vertexConfig `yaml:"from"`
-	To   vertexConfig `yaml:"to"`
-}
-
-type GraphConfig struct {
-	Graph string `yaml:"graph"`
-	Types struct {
-		Noop    []NoopType    `yaml:"noop"`
-		File    []FileType    `yaml:"file"`
-		Service []ServiceType `yaml:"service"`
-		Exec    []ExecType    `yaml:"exec"`
-	} `yaml:"types"`
-	Collector []collectorTypeConfig `yaml:"collect"`
-	Edges     []edgeConfig          `yaml:"edges"`
-	Comment   string                `yaml:"comment"`
-}
-
-func (c *GraphConfig) Parse(data []byte) error {
-	if err := yaml.Unmarshal(data, c); err != nil {
-		return err
-	}
-	if c.Graph == "" {
-		return errors.New("Graph config: invalid `graph`")
-	}
-	return nil
-}
-
-func ParseConfigFromFile(filename string) *GraphConfig {
-	data, err := ioutil.ReadFile(filename)
-	if err != nil {
-		log.Printf("Error: Config: ParseConfigFromFile: File: %v", err)
-		return nil
-	}
-
-	var config GraphConfig
-	if err := config.Parse(data); err != nil {
-		log.Printf("Error: Config: ParseConfigFromFile: Parse: %v", err)
-		return nil
-	}
-
-	return &config
-}
-
-// XXX: we need to fix this function so that it either fails without modifying
-// the graph, passes successfully and modifies it, or basically panics i guess
-// this way an invalid compilation can leave the old graph running, and we we
-// don't modify a partial graph. so we really need to validate, and then perform
-// whatever actions are necessary
-// finding some way to do this on a copy of the graph, and then do a graph diff
-// and merge the new data into the old graph would be more appropriate, in
-// particular if we can ensure the graph merge can't fail. As for the putting
-// of stuff into etcd, we should probably store the operations to complete in
-// the new graph, and keep retrying until it succeeds, thus blocking any new
-// etcd operations until that time.
-func UpdateGraphFromConfig(config *GraphConfig, hostname string, g *Graph, etcdO *EtcdWObject) bool {
-
-	var NoopMap = make(map[string]*Vertex)
-	var FileMap = make(map[string]*Vertex)
-	var ServiceMap = make(map[string]*Vertex)
-	var ExecMap = make(map[string]*Vertex)
-
-	var lookup = make(map[string]map[string]*Vertex)
-	lookup["noop"] = NoopMap
-	lookup["file"] = FileMap
-	lookup["service"] = ServiceMap
-	lookup["exec"] = ExecMap
-
-	//log.Printf("%+v", config) // debug
-
-	g.SetName(config.Graph) // set graph name
-
-	var keep []*Vertex // list of vertex which are the same in new graph
-
-	for _, t := range config.Types.Noop {
-		obj := NewNoopType(t.Name)
-		v := g.GetVertexMatch(obj)
-		if v == nil { // no match found
-			v = NewVertex(obj)
-			g.AddVertex(v) // call standalone in case not part of an edge
-		}
-		NoopMap[obj.Name] = v  // used for constructing edges
-		keep = append(keep, v) // append
-	}
-
-	for _, t := range config.Types.File {
-		// XXX: should we export based on a @@ prefix, or a metaparam
-		// like exported => true || exported => (host pattern)||(other pattern?)
-		if strings.HasPrefix(t.Name, "@@") { // exported resource
-			// add to etcd storage...
-			t.Name = t.Name[2:] //slice off @@
-			if !etcdO.EtcdPut(hostname, t.Name, "file", t) {
-				log.Printf("Problem exporting file resource %v.", t.Name)
-				continue
-			}
-		} else {
-			obj := NewFileType(t.Name, t.Path, t.Dirname, t.Basename, t.Content, t.State)
-			v := g.GetVertexMatch(obj)
-			if v == nil { // no match found
-				v = NewVertex(obj)
-				g.AddVertex(v) // call standalone in case not part of an edge
-			}
-			FileMap[obj.Name] = v  // used for constructing edges
-			keep = append(keep, v) // append
-		}
-	}
-
-	for _, t := range config.Types.Service {
-		obj := NewServiceType(t.Name, t.State, t.Startup)
-		v := g.GetVertexMatch(obj)
-		if v == nil { // no match found
-			v = NewVertex(obj)
-			g.AddVertex(v) // call standalone in case not part of an edge
-		}
-		ServiceMap[obj.Name] = v // used for constructing edges
-		keep = append(keep, v)   // append
-	}
-
-	for _, t := range config.Types.Exec {
-		obj := NewExecType(t.Name, t.Cmd, t.Shell, t.Timeout, t.WatchCmd, t.WatchShell, t.IfCmd, t.IfShell, t.PollInt, t.State)
-		v := g.GetVertexMatch(obj)
-		if v == nil { // no match found
-			v = NewVertex(obj)
-			g.AddVertex(v) // call standalone in case not part of an edge
-		}
-		ExecMap[obj.Name] = v  // used for constructing edges
-		keep = append(keep, v) // append
-	}
-
-	// lookup from etcd graph
-	// do all the graph look ups in one single step, so that if the etcd
-	// database changes, we don't have a partial state of affairs...
-	nodes, ok := etcdO.EtcdGet()
-	if ok {
-		for _, t := range config.Collector {
-			// XXX: use t.Type and optionally t.Pattern to collect from etcd storage
-			log.Printf("Collect: %v; Pattern: %v", t.Type, t.Pattern)
-
-			for _, x := range etcdO.EtcdGetProcess(nodes, "file") {
-				var obj *FileType
-				if B64ToObj(x, &obj) != true {
-					log.Printf("Collect: File: %v not collected!", x)
-					continue
-				}
-				if t.Pattern != "" { // XXX: currently the pattern for files can only override the Dirname variable :P
-					obj.Dirname = t.Pattern
-				}
-
-				log.Printf("Collect: File: %v collected!", obj.GetName())
-
-				// XXX: similar to file add code:
-				v := g.GetVertexMatch(obj)
-				if v == nil { // no match found
-					obj.Init() // initialize go channels or things won't work!!!
-					v = NewVertex(obj)
-					g.AddVertex(v) // call standalone in case not part of an edge
-				}
-				FileMap[obj.GetName()] = v // used for constructing edges
-				keep = append(keep, v)     // append
-
-			}
-
-		}
-	}
-
-	// get rid of any vertices we shouldn't "keep" (that aren't in new graph)
-	for _, v := range g.GetVertices() {
-		if !HasVertex(v, keep) {
-			// wait for exit before starting new graph!
-			v.Type.SendEvent(eventExit, true, false)
-			g.DeleteVertex(v)
-		}
-	}
-
-	for _, e := range config.Edges {
-		if _, ok := lookup[e.From.Type]; !ok {
-			return false
-		}
-		if _, ok := lookup[e.To.Type]; !ok {
-			return false
-		}
-		if _, ok := lookup[e.From.Type][e.From.Name]; !ok {
-			return false
-		}
-		if _, ok := lookup[e.To.Type][e.To.Name]; !ok {
-			return false
-		}
-		g.AddEdge(lookup[e.From.Type][e.From.Name], lookup[e.To.Type][e.To.Name], NewEdge(e.Name))
-	}
-	return true
-}

configwatch.go

@@ -1,155 +0,0 @@
-// Mgmt
-// Copyright (C) 2013-2016+ James Shubin and the project contributors
-// Written by James Shubin <james@shubin.ca> and the project contributors
-//
-// This program is free software: you can redistribute it and/or modify
-// it under the terms of the GNU Affero General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-//
-// This program is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-// GNU Affero General Public License for more details.
-//
-// You should have received a copy of the GNU Affero General Public License
-// along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
-package main
-
-import (
-	"gopkg.in/fsnotify.v1"
-	//"github.com/go-fsnotify/fsnotify" // git master of "gopkg.in/fsnotify.v1"
-	"log"
-	"math"
-	"path"
-	"strings"
-	"syscall"
-)
-
-// XXX: it would be great if we could reuse code between this and the file type
-// XXX: patch this to submit it as part of go-fsnotify if they're interested...
-func ConfigWatch(file string) chan bool {
-	ch := make(chan bool)
-	go func() {
-		var safename = path.Clean(file) // no trailing slash
-
-		watcher, err := fsnotify.NewWatcher()
-		if err != nil {
-			log.Fatal(err)
-		}
-		defer watcher.Close()
-
-		patharray := PathSplit(safename) // tokenize the path
-		var index = len(patharray)       // starting index
-		var current string               // current "watcher" location
-		var deltaDepth int               // depth delta between watcher and event
-		var send = false                 // send event?
-
-		for {
-			current = strings.Join(patharray[0:index], "/")
-			if current == "" { // the empty string top is the root dir ("/")
-				current = "/"
-			}
-			log.Printf("Watching: %v", current) // attempting to watch...
-
-			// initialize in the loop so that we can reset on rm-ed handles
-			err = watcher.Add(current)
-			if err != nil {
-				if err == syscall.ENOENT {
-					index-- // usually not found, move up one dir
-				} else if err == syscall.ENOSPC {
-					// XXX: occasionally: no space left on device,
-					// XXX: probably due to lack of inotify watches
-					log.Printf("Lack of watches for config(%v) error: %+v", file, err.Error) // 0x408da0
-					log.Fatal(err)
-				} else {
-					log.Printf("Unknown config(%v) error:", file)
-					log.Fatal(err)
-				}
-				index = int(math.Max(1, float64(index)))
-				continue
-			}
-
-			select {
-			case event := <-watcher.Events:
-				// the deeper you go, the bigger the deltaDepth is...
-				// this is the difference between what we're watching,
-				// and the event... doesn't mean we can't watch deeper
-				if current == event.Name {
-					deltaDepth = 0 // i was watching what i was looking for
-
-				} else if HasPathPrefix(event.Name, current) {
-					deltaDepth = len(PathSplit(current)) - len(PathSplit(event.Name)) // -1 or less
-
-				} else if HasPathPrefix(current, event.Name) {
-					deltaDepth = len(PathSplit(event.Name)) - len(PathSplit(current)) // +1 or more
-
-				} else {
-					// TODO different watchers get each others events!
-					// https://github.com/go-fsnotify/fsnotify/issues/95
-					// this happened with two values such as:
-					// event.Name: /tmp/mgmt/f3 and current: /tmp/mgmt/f2
-					continue
-				}
-				//log.Printf("The delta depth is: %v", deltaDepth)
-
-				// if we have what we wanted, awesome, send an event...
-				if event.Name == safename {
-					//log.Println("Event!")
-					send = true
-
-					// file removed, move the watch upwards
-					if deltaDepth >= 0 && (event.Op&fsnotify.Remove == fsnotify.Remove) {
-						//log.Println("Removal!")
-						watcher.Remove(current)
-						index--
-					}
-
-					// we must be a parent watcher, so descend in
-					if deltaDepth < 0 {
-						watcher.Remove(current)
-						index++
-					}
-
-					// if safename starts with event.Name, we're above, and no event should be sent
-				} else if HasPathPrefix(safename, event.Name) {
-					//log.Println("Above!")
-
-					if deltaDepth >= 0 && (event.Op&fsnotify.Remove == fsnotify.Remove) {
-						log.Println("Removal!")
-						watcher.Remove(current)
-						index--
-					}
-
-					if deltaDepth < 0 {
-						log.Println("Parent!")
-						if PathPrefixDelta(safename, event.Name) == 1 { // we're the parent dir
-							//send = true
-						}
-						watcher.Remove(current)
-						index++
-					}
-
-					// if event.Name startswith safename, send event, we're already deeper
-				} else if HasPathPrefix(event.Name, safename) {
-					//log.Println("Event2!")
-					//send = true
-				}
-
-			case err := <-watcher.Errors:
-				log.Println("error:", err)
-				log.Fatal(err)
-
-			}
-
-			// do our event sending all together to avoid duplicate msgs
-			if send {
-				send = false
-				ch <- true
-			}
-		}
-		//close(ch)
-	}()
-	return ch
-}

converger/converger.go

@@ -0,0 +1,386 @@
+// Mgmt
+// Copyright (C) 2013-2017+ James Shubin and the project contributors
+// Written by James Shubin <james@shubin.ca> and the project contributors
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+// Package converger is a facility for reporting the converged state.
+package converger
+
+import (
+	"fmt"
+	"sync"
+	"time"
+
+	"github.com/purpleidea/mgmt/util"
+)
+
+// TODO: we could make a new function that masks out the state of certain
+// UID's, but at the moment the new Timer code has obsoleted the need...
+
+// Converger is the general interface for implementing a convergence watcher.
+type Converger interface { // TODO: need a better name
+	Register() UID
+	IsConverged(UID) bool         // is the UID converged ?
+	SetConverged(UID, bool) error // set the converged state of the UID
+	Unregister(UID)
+	Start()
+	Pause()
+	Loop(bool)
+	ConvergedTimer(UID) <-chan time.Time
+	Status() map[uint64]bool
+	Timeout() int                // returns the timeout that this was created with
+	SetStateFn(func(bool) error) // sets the stateFn
+}
+
+// UID is the interface resources can use to notify with if converged. You'll
+// need to use part of the Converger interface to Register initially too.
+type UID interface {
+	ID() uint64   // get Id
+	Name() string // get a friendly name
+	SetName(string)
+	IsValid() bool // has Id been initialized ?
+	InvalidateID() // set Id to nil
+	IsConverged() bool
+	SetConverged(bool) error
+	Unregister()
+	ConvergedTimer() <-chan time.Time
+	StartTimer() (func() error, error) // cancellable is the same as StopTimer()
+	ResetTimer() error                 // resets counter to zero
+	StopTimer() error
+}
+
+// converger is an implementation of the Converger interface.
+type converger struct {
+	timeout   int              // must be zero (instant) or greater seconds to run
+	stateFn   func(bool) error // run on converged state changes with state bool
+	converged bool             // did we converge (state changes of this run Fn)
+	channel   chan struct{}    // signal here to run an isConverged check
+	control   chan bool        // control channel for start/pause
+	mutex     sync.RWMutex     // used for controlling access to status and lastid
+	lastid    uint64
+	status    map[uint64]bool
+}
+
+// cuid is an implementation of the UID interface.
+type cuid struct {
+	converger Converger
+	id        uint64
+	name      string // user defined, friendly name
+	mutex     sync.Mutex
+	timer     chan struct{}
+	running   bool // is the above timer running?
+	wg        sync.WaitGroup
+}
+
+// NewConverger builds a new converger struct.
+func NewConverger(timeout int, stateFn func(bool) error) *converger {
+	return &converger{
+		timeout: timeout,
+		stateFn: stateFn,
+		channel: make(chan struct{}),
+		control: make(chan bool),
+		lastid:  0,
+		status:  make(map[uint64]bool),
+	}
+}
+
+// Register assigns a UID to the caller.
+func (obj *converger) Register() UID {
+	obj.mutex.Lock()
+	defer obj.mutex.Unlock()
+	obj.lastid++
+	obj.status[obj.lastid] = false // initialize as not converged
+	return &cuid{
+		converger: obj,
+		id:        obj.lastid,
+		name:      fmt.Sprintf("%d", obj.lastid), // some default
+		timer:     nil,
+		running:   false,
+	}
+}
+
+// IsConverged gets the converged status of a uid.
+func (obj *converger) IsConverged(uid UID) bool {
+	if !uid.IsValid() {
+		panic(fmt.Sprintf("the ID of UID(%s) is nil", uid.Name()))
+	}
+	obj.mutex.RLock()
+	isConverged, found := obj.status[uid.ID()] // lookup
+	obj.mutex.RUnlock()
+	if !found {
+		panic("the ID of UID is unregistered")
+	}
+	return isConverged
+}
+
+// SetConverged updates the converger with the converged state of the UID.
+func (obj *converger) SetConverged(uid UID, isConverged bool) error {
+	if !uid.IsValid() {
+		return fmt.Errorf("the ID of UID(%s) is nil", uid.Name())
+	}
+	obj.mutex.Lock()
+	if _, found := obj.status[uid.ID()]; !found {
+		panic("the ID of UID is unregistered")
+	}
+	obj.status[uid.ID()] = isConverged // set
+	obj.mutex.Unlock()                 // unlock *before* poke or deadlock!
+	if isConverged != obj.converged {  // only poke if it would be helpful
+		// run in a go routine so that we never block... just queue up!
+		// this allows us to send events, even if we haven't started...
+		go func() { obj.channel <- struct{}{} }()
+	}
+	return nil
+}
+
+// isConverged returns true if *every* registered uid has converged.
+func (obj *converger) isConverged() bool {
+	obj.mutex.RLock() // take a read lock
+	defer obj.mutex.RUnlock()
+	for _, v := range obj.status {
+		if !v { // everyone must be converged for this to be true
+			return false
+		}
+	}
+	return true
+}
+
+// Unregister dissociates the ConvergedUID from the converged checking.
+func (obj *converger) Unregister(uid UID) {
+	if !uid.IsValid() {
+		panic(fmt.Sprintf("the ID of UID(%s) is nil", uid.Name()))
+	}
+	obj.mutex.Lock()
+	uid.StopTimer() // ignore any errors
+	delete(obj.status, uid.ID())
+	obj.mutex.Unlock()
+	uid.InvalidateID()
+}
+
+// Start causes a Converger object to start or resume running.
+func (obj *converger) Start() {
+	obj.control <- true
+}
+
+// Pause causes a Converger object to stop running temporarily.
+func (obj *converger) Pause() { // FIXME: add a sync ACK on pause before return
+	obj.control <- false
+}
+
+// Loop is the main loop for a Converger object. It usually runs in a goroutine.
+// TODO: we could eventually have each resource tell us as soon as it converges,
+// and then keep track of the time delays here, to avoid callers needing select.
+// NOTE: when we have very short timeouts, if we start before all the resources
+// have joined the map, then it might appear as if we converged before we did!
+func (obj *converger) Loop(startPaused bool) {
+	if obj.control == nil {
+		panic("converger not initialized correctly")
+	}
+	if startPaused { // start paused without racing
+		select {
+		case e := <-obj.control:
+			if !e {
+				panic("converger expected true")
+			}
+		}
+	}
+	for {
+		select {
+		case e := <-obj.control: // expecting "false" which means pause!
+			if e {
+				panic("converger expected false")
+			}
+			// now i'm paused...
+			select {
+			case e := <-obj.control:
+				if !e {
+					panic("converger expected true")
+				}
+				// restart
+				// kick once to refresh the check...
+				go func() { obj.channel <- struct{}{} }()
+				continue
+			}
+
+		case <-obj.channel:
+			if !obj.isConverged() {
+				if obj.converged { // we're doing a state change
+					if obj.stateFn != nil {
+						// call an arbitrary function
+						if err := obj.stateFn(false); err != nil {
+							// FIXME: what to do on error ?
+						}
+					}
+				}
+				obj.converged = false
+				continue
+			}
+
+			// we have converged!
+			if obj.timeout >= 0 { // only run if timeout is valid
+				if !obj.converged { // we're doing a state change
+					if obj.stateFn != nil {
+						// call an arbitrary function
+						if err := obj.stateFn(true); err != nil {
+							// FIXME: what to do on error ?
+						}
+					}
+				}
+			}
+			obj.converged = true
+			// loop and wait again...
+		}
+	}
+}
+
+// ConvergedTimer adds a timeout to a select call and blocks until then.
+// TODO: this means we could eventually have per resource converged timeouts
+func (obj *converger) ConvergedTimer(uid UID) <-chan time.Time {
+	// be clever: if i'm already converged, this timeout should block which
+	// avoids unnecessary new signals being sent! this avoids fast loops if
+	// we have a low timeout, or in particular a timeout == 0
+	if uid.IsConverged() {
+		// blocks the case statement in select forever!
+		return util.TimeAfterOrBlock(-1)
+	}
+	return util.TimeAfterOrBlock(obj.timeout)
+}
+
+// Status returns a map of the converged status of each UID.
+func (obj *converger) Status() map[uint64]bool {
+	status := make(map[uint64]bool)
+	obj.mutex.RLock() // take a read lock
+	defer obj.mutex.RUnlock()
+	for k, v := range obj.status { // make a copy to avoid the mutex
+		status[k] = v
+	}
+	return status
+}
+
+// Timeout returns the timeout in seconds that converger was created with. This
+// is useful to avoid passing in the timeout value separately when you're
+// already passing in the Converger struct.
+func (obj *converger) Timeout() int {
+	return obj.timeout
+}
+
+// SetStateFn sets the state function to be run on change of converged state.
+func (obj *converger) SetStateFn(stateFn func(bool) error) {
+	obj.stateFn = stateFn
+}
+
+// ID returns the unique id of this UID object.
+func (obj *cuid) ID() uint64 {
+	return obj.id
+}
+
+// Name returns a user defined name for the specific cuid.
+func (obj *cuid) Name() string {
+	return obj.name
+}
+
+// SetName sets a user defined name for the specific cuid.
+func (obj *cuid) SetName(name string) {
+	obj.name = name
+}
+
+// IsValid tells us if the id is valid or has already been destroyed.
+func (obj *cuid) IsValid() bool {
+	return obj.id != 0 // an id of 0 is invalid
+}
+
+// InvalidateID marks the id as no longer valid.
+func (obj *cuid) InvalidateID() {
+	obj.id = 0 // an id of 0 is invalid
+}
+
+// IsConverged is a helper function to the regular IsConverged method.
+func (obj *cuid) IsConverged() bool {
+	return obj.converger.IsConverged(obj)
+}
+
+// SetConverged is a helper function to the regular SetConverged notification.
+func (obj *cuid) SetConverged(isConverged bool) error {
+	return obj.converger.SetConverged(obj, isConverged)
+}
+
+// Unregister is a helper function to unregister myself.
+func (obj *cuid) Unregister() {
+	obj.converger.Unregister(obj)
+}
+
+// ConvergedTimer is a helper around the regular ConvergedTimer method.
+func (obj *cuid) ConvergedTimer() <-chan time.Time {
+	return obj.converger.ConvergedTimer(obj)
+}
+
+// StartTimer runs an invisible timer that automatically converges on timeout.
+func (obj *cuid) StartTimer() (func() error, error) {
+	obj.mutex.Lock()
+	if !obj.running {
+		obj.timer = make(chan struct{})
+		obj.running = true
+	} else {
+		obj.mutex.Unlock()
+		return obj.StopTimer, fmt.Errorf("timer already started")
+	}
+	obj.mutex.Unlock()
+	obj.wg.Add(1)
+	go func() {
+		defer obj.wg.Done()
+		for {
+			select {
+			case _, ok := <-obj.timer: // reset signal channel
+				if !ok { // channel is closed
+					return // false to exit
+				}
+				obj.SetConverged(false)
+
+			case <-obj.ConvergedTimer():
+				obj.SetConverged(true) // converged!
+				select {
+				case _, ok := <-obj.timer: // reset signal channel
+					if !ok { // channel is closed
+						return // false to exit
+					}
+				}
+			}
+		}
+	}()
+	return obj.StopTimer, nil
+}
+
+// ResetTimer resets the counter to zero if using a StartTimer internally.
+func (obj *cuid) ResetTimer() error {
+	obj.mutex.Lock()
+	defer obj.mutex.Unlock()
+	if obj.running {
+		obj.timer <- struct{}{} // send the reset message
+		return nil
+	}
+	return fmt.Errorf("timer hasn't been started")
+}
+
+// StopTimer stops the running timer permanently until a StartTimer is run.
+func (obj *cuid) StopTimer() error {
+	obj.mutex.Lock()
+	defer obj.mutex.Unlock()
+	if !obj.running {
+		return fmt.Errorf("timer isn't running")
+	}
+	close(obj.timer)
+	obj.wg.Wait()
+	obj.running = false
+	return nil
+}

doc.go

@@ -1,5 +1,5 @@
 // Mgmt
-// Copyright (C) 2013-2016+ James Shubin and the project contributors
+// Copyright (C) 2013-2017+ James Shubin and the project contributors
 // Written by James Shubin <james@shubin.ca> and the project contributors
 //
 // This program is free software: you can redistribute it and/or modify
@@ -15,12 +15,5 @@
 // You should have received a copy of the GNU Affero General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+// Package main provides the main entrypoint for using the `mgmt` software.
 package main
-
-import (
-//"testing"
-)
-
-//func TestT1(t *testing.T) {
-
-//}

docker/Dockerfile

@@ -0,0 +1,22 @@
+FROM golang:1.6.2
+
+MAINTAINER Michał Czeraszkiewicz <contact@czerasz.com>
+
+# Set the reset cache variable
+# Read more here: http://czerasz.com/2014/11/13/docker-tip-and-tricks/#use-refreshedat-variable-for-better-cache-control
+ENV REFRESHED_AT 2016-05-10
+
+# Update the package list to be able to use required packages
+RUN apt-get update
+
+# Change the working directory
+WORKDIR /go/src/mgmt
+
+# Copy all the files to the working directory
+COPY . /go/src/mgmt
+
+# Install dependencies
+RUN make deps
+
+# Build the binary
+RUN make build

docker/Dockerfile.development

@@ -0,0 +1,31 @@
+FROM golang:1.6.2
+
+MAINTAINER Michał Czeraszkiewicz <contact@czerasz.com>
+
+# Set the reset cache variable
+# Read more here: http://czerasz.com/2014/11/13/docker-tip-and-tricks/#use-refreshedat-variable-for-better-cache-control
+ENV REFRESHED_AT 2016-05-14
+
+RUN apt-get update
+
+# Setup User to match Host User
+# Give the nre user superuser permissions
+ARG USER_ID=1000
+ARG GROUP_ID=1000
+ARG USER_NAME=mgmt
+ARG GROUP_NAME=$USER_NAME
+RUN groupadd --gid $GROUP_ID $GROUP_NAME && \
+	useradd --create-home --home /home/$USER_NAME --uid ${USER_ID} --gid $GROUP_NAME --groups sudo $USER_NAME && \
+	echo "$USER_NAME ALL=(ALL) NOPASSWD:ALL" >> /etc/sudoers
+
+# Copy all the files to the working directory
+COPY . /home/$USER_NAME/mgmt
+
+# Change working directory
+WORKDIR /home/$USER_NAME/mgmt
+
+# Install dependencies
+RUN make deps
+
+# Change user
+USER ${USER_NAME}

docker/scripts/build

@@ -0,0 +1,26 @@
+#!/bin/bash
+
+script_directory="$( cd "$( dirname "$0" )" && pwd )"
+project_directory=$script_directory/../..
+
+# Specify the Docker image name
+image_name='purpleidea/mgmt'
+
+# Build the image which contains the compiled binary
+docker build -t $image_name \
+	--file=$project_directory/docker/Dockerfile $project_directory
+
+# Remove the container if it already exists
+docker rm -f mgmt-export 2> /dev/null
+
+# Start the container in background so we can "copy out" the binary
+docker run -d --name=mgmt-export $image_name bash -c 'while true; sleep 1000; done'
+
+# Remove the current binary
+rm $project_directory/mgmt 2> /dev/null
+
+# Get the binary from the container
+docker cp mgmt-export:/go/src/mgmt/mgmt $project_directory/mgmt
+
+# Remove the container
+docker rm -f mgmt-export 2> /dev/null

docker/scripts/build-development

@@ -0,0 +1,14 @@
+#!/bin/bash
+
+# Stop on any error
+set -e
+
+script_directory="$( cd "$( dirname "$0" )" && pwd )"
+project_directory=$script_directory/../..
+
+# Specify the Docker image name
+image_name='purpleidea/mgmt:development'
+
+# Build the image
+docker build -t $image_name \
+	--file=$project_directory/docker/Dockerfile.development $project_directory

docker/scripts/run-development

@@ -0,0 +1,15 @@
+#!/bin/bash
+
+# Stop on any error
+set -e
+
+script_directory="$( cd "$( dirname "$0" )" && pwd )"
+project_directory=$script_directory/../..
+
+# Specify the Docker image name
+image_name='purpleidea/mgmt:development'
+
+# Run container in development mode
+docker run --rm --name=mgm_development --user=mgmt \
+	-v $project_directory:/home/mgmt/mgmt \
+	-it $image_name bash

docs/.gitignore

@@ -0,0 +1,2 @@
+mgmt-documentation.pdf
+_build

docs/Makefile

@@ -0,0 +1,20 @@
+# Minimal makefile for Sphinx documentation
+#
+
+# You can set these variables from the command line.
+SPHINXOPTS    =
+SPHINXBUILD   = sphinx-build
+SPHINXPROJ    = mgmt
+SOURCEDIR     = .
+BUILDDIR      = _build
+
+# Put it first so that "make" without argument is like "make help".
+help:
+	@$(SPHINXBUILD) -M help "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O)
+
+.PHONY: help Makefile
+
+# Catch-all target: route all unknown targets to Sphinx using the new
+# "make mode" option.  $(O) is meant as a shortcut for $(SPHINXOPTS).
+%: Makefile
+	@$(SPHINXBUILD) -M $@ "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O)

docs/conf.py

@@ -0,0 +1,158 @@
+# -*- coding: utf-8 -*-
+#
+# mgmt documentation build configuration file, created by
+# sphinx-quickstart on Wed Feb 15 21:34:09 2017.
+#
+# This file is execfile()d with the current directory set to its
+# containing dir.
+#
+# Note that not all possible configuration values are present in this
+# autogenerated file.
+#
+# All configuration values have a default; values that are commented out
+# serve to show the default.
+
+# If extensions (or modules to document with autodoc) are in another directory,
+# add these directories to sys.path here. If the directory is relative to the
+# documentation root, use os.path.abspath to make it absolute, like shown here.
+#
+# import os
+# import sys
+# sys.path.insert(0, os.path.abspath('.'))
+
+from recommonmark.parser import CommonMarkParser
+
+# -- General configuration ------------------------------------------------
+
+# If your documentation needs a minimal Sphinx version, state it here.
+#
+# needs_sphinx = '1.0'
+
+# Add any Sphinx extension module names here, as strings. They can be
+# extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
+# ones.
+extensions = []
+
+# Add any paths that contain templates here, relative to this directory.
+templates_path = ['_templates']
+
+# The suffix(es) of source filenames.
+# You can specify multiple suffix as a list of string:
+#
+
+source_parsers = {
+        '.md': CommonMarkParser,
+}
+
+source_suffix = ['.rst', '.md']
+
+# The master toctree document.
+master_doc = 'index'
+
+# General information about the project.
+project = u'mgmt'
+copyright = u'2013-2017+ James Shubin and the project contributors'
+author = u'James Shubin'
+
+# The version info for the project you're documenting, acts as replacement for
+# |version| and |release|, also used in various other places throughout the
+# built documents.
+#
+# The short X.Y version.
+version = u''
+# The full version, including alpha/beta/rc tags.
+release = u''
+
+# The language for content autogenerated by Sphinx. Refer to documentation
+# for a list of supported languages.
+#
+# This is also used if you do content translation via gettext catalogs.
+# Usually you set "language" from the command line for these cases.
+language = None
+
+# List of patterns, relative to source directory, that match files and
+# directories to ignore when looking for source files.
+# This patterns also effect to html_static_path and html_extra_path
+exclude_patterns = ['_build', 'Thumbs.db', '.DS_Store', 'venv']
+
+# The name of the Pygments (syntax highlighting) style to use.
+pygments_style = 'sphinx'
+
+# If true, `todo` and `todoList` produce output, else they produce nothing.
+todo_include_todos = False
+
+
+# -- Options for HTML output ----------------------------------------------
+
+# The theme to use for HTML and HTML Help pages.  See the documentation for
+# a list of builtin themes.
+#
+#html_theme = 'alabaster'
+
+# Theme options are theme-specific and customize the look and feel of a theme
+# further.  For a list of options available for each theme, see the
+# documentation.
+#
+# html_theme_options = {}
+
+# Add any paths that contain custom static files (such as style sheets) here,
+# relative to this directory. They are copied after the builtin static files,
+# so a file named "default.css" will overwrite the builtin "default.css".
+html_static_path = ['_static']
+
+
+# -- Options for HTMLHelp output ------------------------------------------
+
+# Output file base name for HTML help builder.
+htmlhelp_basename = 'mgmtdoc'
+
+
+# -- Options for LaTeX output ---------------------------------------------
+
+latex_elements = {
+    # The paper size ('letterpaper' or 'a4paper').
+    #
+    # 'papersize': 'letterpaper',
+
+    # The font size ('10pt', '11pt' or '12pt').
+    #
+    # 'pointsize': '10pt',
+
+    # Additional stuff for the LaTeX preamble.
+    #
+    # 'preamble': '',
+
+    # Latex figure (float) alignment
+    #
+    # 'figure_align': 'htbp',
+}
+
+# Grouping the document tree into LaTeX files. List of tuples
+# (source start file, target name, title,
+#  author, documentclass [howto, manual, or own class]).
+latex_documents = [
+    (master_doc, 'mgmt.tex', u'mgmt Documentation',
+     u'James Shubin', 'manual'),
+]
+
+
+# -- Options for manual page output ---------------------------------------
+
+# One entry per manual page. List of tuples
+# (source start file, name, description, authors, manual section).
+man_pages = [
+    (master_doc, 'mgmt', u'mgmt Documentation',
+     [author], 1)
+]
+
+
+# -- Options for Texinfo output -------------------------------------------
+
+# Grouping the document tree into Texinfo files. List of tuples
+# (source start file, target name, title, author,
+#  dir menu entry, description, category)
+texinfo_documents = [
+    (master_doc, 'mgmt', u'mgmt Documentation',
+     author, 'mgmt', 'A next generation config management prototype!',
+     'Miscellaneous'),
+]

docs/documentation.md

@@ -0,0 +1,646 @@
+# mgmt
+
+Available from:
+[https://github.com/purpleidea/mgmt/](https://github.com/purpleidea/mgmt/)
+
+This documentation is available in: [Markdown](https://github.com/purpleidea/mgmt/blob/master/docs/documentation.md) or [PDF](https://pdfdoc-purpleidea.rhcloud.com/pdf/https://github.com/purpleidea/mgmt/blob/master/docs/documentation.md) format.
+
+## Overview
+
+The `mgmt` tool is a next generation config management prototype. It's not yet
+ready for production, but we hope to get there soon. Get involved today!
+
+## Project Description
+
+The mgmt tool is a distributed, event driven, config management tool, that
+supports parallel execution, and librarification to be used as the management
+foundation in and for, new and existing software.
+
+For more information, you may like to read some blog posts from the author:
+
+* [Next generation config mgmt](https://ttboj.wordpress.com/2016/01/18/next-generation-configuration-mgmt/)
+* [Automatic edges in mgmt](https://ttboj.wordpress.com/2016/03/14/automatic-edges-in-mgmt/)
+* [Automatic grouping in mgmt](https://ttboj.wordpress.com/2016/03/30/automatic-grouping-in-mgmt/)
+* [Automatic clustering in mgmt](https://ttboj.wordpress.com/2016/06/20/automatic-clustering-in-mgmt/)
+* [Remote execution in mgmt](https://ttboj.wordpress.com/2016/10/07/remote-execution-in-mgmt/)
+* [Send/Recv in mgmt](https://ttboj.wordpress.com/2016/12/07/sendrecv-in-mgmt/)
+* [Metaparameters in mgmt](https://ttboj.wordpress.com/2017/03/01/metaparameters-in-mgmt/)
+
+There is also an [introductory video](http://meetings-archive.debian.net/pub/debian-meetings/2016/debconf16/Next_Generation_Config_Mgmt.webm) available.
+Older videos and other material [is available](https://github.com/purpleidea/mgmt/#on-the-web).
+
+## Setup
+
+During this prototype phase, the tool can be run out of the source directory.
+You'll probably want to use ```./run.sh run --yaml examples/graph1.yaml``` to
+get started. Beware that this _can_ cause data loss. Understand what you're
+doing first, or perform these actions in a virtual environment such as the one
+provided by [Oh-My-Vagrant](https://github.com/purpleidea/oh-my-vagrant).
+
+## Features
+
+This section details the numerous features of mgmt and some caveats you might
+need to be aware of.
+
+### Autoedges
+
+Automatic edges, or AutoEdges, is the mechanism in mgmt by which it will
+automatically create dependencies for you between resources. For example,
+since mgmt can discover which files are installed by a package it will
+automatically ensure that any file resource you declare that matches a
+file installed by your package resource will only be processed after the
+package is installed.
+
+#### Controlling autoedges
+
+Though autoedges is likely to be very helpful and avoid you having to declare
+all dependencies explicitly, there are cases where this behaviour is
+undesirable.
+
+Some distributions allow package installations to automatically start the
+service they ship. This can be problematic in the case of packages like MySQL
+as there are configuration options that need to be set before MySQL is ever
+started for the first time (or you'll need to wipe the data directory). In
+order to handle this situation you can disable autoedges per resource and
+explicitly declare that you want `my.cnf` to be written to disk before the
+installation of the `mysql-server` package.
+
+You can disable autoedges for a resource by setting the `autoedge` key on
+the meta attributes of that resource to `false`.
+
+#### Blog post
+
+You can read the introductory blog post about this topic here:
+[https://ttboj.wordpress.com/2016/03/14/automatic-edges-in-mgmt/](https://ttboj.wordpress.com/2016/03/14/automatic-edges-in-mgmt/)
+
+### Autogrouping
+
+Automatic grouping or AutoGroup is the mechanism in mgmt by which it will
+automatically group multiple resource vertices into a single one. This is
+particularly useful for grouping multiple package resources into a single
+resource, since the multiple installations can happen together in a single
+transaction, which saves a lot of time because package resources typically have
+a large fixed cost to running (downloading and verifying the package repo) and
+if they are grouped they share this fixed cost. This grouping feature can be
+used for other use cases too.
+
+You can disable autogrouping for a resource by setting the `autogroup` key on
+the meta attributes of that resource to `false`.
+
+#### Blog post
+
+You can read the introductory blog post about this topic here:
+[https://ttboj.wordpress.com/2016/03/30/automatic-grouping-in-mgmt/](https://ttboj.wordpress.com/2016/03/30/automatic-grouping-in-mgmt/)
+
+### Automatic clustering
+
+Automatic clustering is a feature by which mgmt automatically builds, scales,
+and manages the embedded etcd cluster which is compiled into mgmt itself. It is
+quite helpful for rapidly bootstrapping clusters and avoiding the extra work to
+setup etcd.
+
+If you prefer to avoid this feature. you can always opt to use an existing etcd
+cluster that is managed separately from mgmt by pointing your mgmt agents at it
+with the `--seeds` variable.
+
+#### Blog post
+
+You can read the introductory blog post about this topic here:
+[https://ttboj.wordpress.com/2016/06/20/automatic-clustering-in-mgmt/](https://ttboj.wordpress.com/2016/06/20/automatic-clustering-in-mgmt/)
+
+### Remote ("agent-less") mode
+
+Remote mode is a special mode that lets you kick off mgmt runs on one or more
+remote machines which are only accessible via SSH. In this mode the initiating
+host connects over SSH, copies over the `mgmt` binary, opens an SSH tunnel, and
+runs the remote program while simultaneously passing the etcd traffic back
+through the tunnel so that the initiators etcd cluster can be used to exchange
+resource data.
+
+The interesting benefit of this architecture is that multiple hosts which can't
+connect directly use the initiator to pass the important traffic through to each
+other. Once the cluster has converged all the remote programs can shutdown
+leaving no residual agent.
+
+This mode can also be useful for bootstrapping a new host where you'd like to
+have the service run continuously and as part of an mgmt cluster normally.
+
+In particular, when combined with the `--converged-timeout` parameter, the
+entire set of running mgmt agents will need to all simultaneously converge for
+the group to exit. This is particularly useful for bootstrapping new clusters
+which need to exchange information that is only available at run time.
+
+#### Blog post
+
+You can read the introductory blog post about this topic here:
+[https://ttboj.wordpress.com/2016/10/07/remote-execution-in-mgmt/](https://ttboj.wordpress.com/2016/10/07/remote-execution-in-mgmt/)
+
+### Puppet support
+
+You can supply a Puppet manifest instead of creating the (YAML) graph manually.
+Puppet must be installed and in `mgmt`'s search path. You also need the
+[ffrank-mgmtgraph Puppet module](https://forge.puppet.com/ffrank/mgmtgraph).
+
+Invoke `mgmt` with the `--puppet` switch, which supports 3 variants:
+
+1. Request the configuration from the Puppet Master (like `puppet agent` does)
+
+        mgmt run --puppet agent
+
+2. Compile a local manifest file (like `puppet apply`)
+
+        mgmt run --puppet /path/to/my/manifest.pp
+
+3. Compile an ad hoc manifest from the commandline (like `puppet apply -e`)
+
+        mgmt run --puppet 'file { "/etc/ntp.conf": ensure => file }'
+
+For more details and caveats see [Puppet.md](Puppet.md).
+
+#### Blog post
+
+An introductory post on the Puppet support is on
+[Felix's blog](http://ffrank.github.io/features/2016/06/19/puppet-powered-mgmt/).
+
+## Resources
+
+This section lists all the built-in resources and their properties. The
+resource primitives in `mgmt` are typically more powerful than resources in
+other configuration management systems because they can be event based which
+lets them respond in real-time to converge to the desired state. This property
+allows you to build more complex resources that you probably hadn't considered
+in the past.
+
+In addition to the resource specific properties, there are resource properties
+(otherwise known as parameters) which can apply to every resource. These are
+called [meta parameters](#meta-parameters) and are listed separately. Certain
+meta parameters aren't very useful when combined with certain resources, but
+in general, it should be fairly obvious, such as when combining the `noop` meta
+parameter with the [Noop](#Noop) resource.
+
+* [Augeas](#Augeas): Manipulate files using augeas.
+* [Exec](#Exec): Execute shell commands on the system.
+* [File](#File): Manage files and directories.
+* [Hostname](#Hostname): Manages the hostname on the system.
+* [KV](#KV): Set a key value pair in our shared world database.
+* [Msg](#Msg): Send log messages.
+* [Noop](#Noop): A simple resource that does nothing.
+* [Nspawn](#Nspawn): Manage systemd-machined nspawn containers.
+* [Password](#Password): Create random password strings.
+* [Pkg](#Pkg):  Manage system packages with PackageKit.
+* [Svc](#Svc): Manage system systemd services.
+* [Timer](#Timer): Manage system systemd services.
+* [Virt](#Virt): Manage virtual machines with libvirt.
+
+
+### Augeas
+
+The augeas resource uses [augeas](http://augeas.net/) commands to manipulate
+files.
+
+### Exec
+
+The exec resource can execute commands on your system.
+
+### File
+
+The file resource manages files and directories. In `mgmt`, directories are
+identified by a trailing slash in their path name. File have no such slash.
+
+It has the following properties:
+
+- `path`: file path (directories have a trailing slash here)
+- `content`: raw file content
+- `state`: either `exists` (the default value) or `absent`
+- `mode`: octal unix file permissions
+- `owner`: username or uid for the file owner
+- `group`: group name or gid for the file group
+
+#### Path
+
+The path property specifies the file or directory that we are managing.
+
+#### Content
+
+The content property is a string that specifies the desired file contents.
+
+#### Source
+
+The source property points to a source file or directory path that we wish to
+copy over and use as the desired contents for our resource.
+
+#### State
+
+The state property describes the action we'd like to apply for the resource. The
+possible values are: `exists` and `absent`.
+
+#### Recurse
+
+The recurse property limits whether file resource operations should recurse into
+and monitor directory contents with a depth greater than one.
+
+#### Force
+
+The force property is required if we want the file resource to be able to change
+a file into a directory or vice-versa. If such a change is needed, but the force
+property is not set to `true`, then this file resource will error.
+
+### Hostname
+
+The hostname resource manages static, transient/dynamic and pretty hostnames
+on the system and watches them for changes.
+
+#### static_hostname
+The static hostname is the one configured in /etc/hostname or a similar
+file.
+It is chosen by the local user. It is not always in sync with the current
+host name as returned by the gethostname() system call.
+
+#### transient_hostname
+The transient / dynamic hostname is the one configured via the kernel's
+sethostbyname().
+It can be different from the static hostname in case DHCP or mDNS have been
+configured to change the name based on network information.
+
+#### pretty_hostname
+The pretty hostname is a free-form UTF8 host name for presentation to the user.
+
+#### hostname
+Hostname is the fallback value for all 3 fields above, if only `hostname` is
+specified, it will set all 3 fields to this value.
+
+### KV
+
+The KV resource sets a key and value pair in the global world database. This is
+quite useful for setting a flag after a number of resources have run. It will
+ignore database updates to the value that are greater in compare order than the
+requested key if the `SkipLessThan` parameter is set to true. If we receive a
+refresh, then the stored value will be reset to the requested value even if the
+stored value is greater.
+
+#### Key
+The string key used to store the key.
+
+#### Value
+The string value to set. This can also be set via Send/Recv.
+
+#### SkipLessThan
+If this parameter is set to `true`, then it will ignore updating the value as
+long as the database versions are greater than the requested value. The compare
+operation used is based on the `SkipCmpStyle` parameter.
+
+#### SkipCmpStyle
+By default this converts the string values to integers and compares them as you
+would expect.
+
+### Msg
+
+The msg resource sends messages to the main log, or an external service such
+as systemd's journal.
+
+### Noop
+
+The noop resource does absolutely nothing. It does have some utility in testing
+`mgmt` and also as a placeholder in the resource graph.
+
+### Nspawn
+
+The nspawn resource is used to manage systemd-machined style containers.
+
+### Password
+
+The password resource can generate a random string to be used as a password. It
+will re-generate the password if it receives a refresh notification.
+
+### Pkg
+
+The pkg resource is used to manage system packages. This resource works on many
+different distributions because it uses the underlying packagekit facility which
+supports different backends for different environments. This ensures that we
+have great Debian (deb/dpkg) and Fedora (rpm/dnf) support simultaneously.
+
+### Svc
+
+The service resource is still very WIP. Please help us my improving it!
+
+### Timer
+
+This resource needs better documentation. Please help us my improving it!
+
+### Virt
+
+The virt resource can manage virtual machines via libvirt.
+
+## Usage and frequently asked questions
+(Send your questions as a patch to this FAQ! I'll review it, merge it, and
+respond by commit with the answer.)
+
+### Why did you start this project?
+
+I wanted a next generation config management solution that didn't have all of
+the design flaws or limitations that the current generation of tools do, and no
+tool existed!
+
+### Why did you use etcd? What about consul?
+
+Etcd and consul are both written in golang, which made them the top two
+contenders for my prototype. Ultimately a choice had to be made, and etcd was
+chosen, but it was also somewhat arbitrary. If there is available interest,
+good reasoning, *and* patches, then we would consider either switching or
+supporting both, but this is not a high priority at this time.
+
+### Can I use an existing etcd cluster instead of the automatic embedded servers?
+
+Yes, it's possible to use an existing etcd cluster instead of the automatic,
+elastic embedded etcd servers. To do so, simply point to the cluster with the
+`--seeds` variable, the same way you would if you were seeding a new member to
+an existing mgmt cluster.
+
+The downside to this approach is that you won't benefit from the automatic
+elastic nature of the embedded etcd servers, and that you're responsible if you
+accidentally break your etcd cluster, or if you use an unsupported version.
+
+### What does the error message about an inconsistent dataDir mean?
+
+If you get an error message similar to:
+
+```
+Etcd: Connect: CtxError...
+Etcd: CtxError: Reason: CtxDelayErr(5s): No endpoints available yet!
+Etcd: Connect: Endpoints: []
+Etcd: The dataDir (/var/lib/mgmt/etcd) might be inconsistent or corrupt.
+```
+
+This happens when there are a series of fatal connect errors in a row. This can
+happen when you start `mgmt` using a dataDir that doesn't correspond to the
+current cluster view. As a result, the embedded etcd server never finishes
+starting up, and as a result, a default endpoint never gets added. The solution
+is to either reconcile the mistake, and if there is no important data saved, you
+can remove the etcd dataDir. This is typically `/var/lib/mgmt/etcd/member/`.
+
+### Why do resources have both a `Compare` method and an `IFF` (on the UID) method?
+
+The `Compare()` methods are for determining if two resources are effectively the
+same, which is used to make graph change delta's efficient. This is when we want
+to change from the current running graph to a new graph, but preserve the common
+vertices. Since we want to make this process efficient, we only update the parts
+that are different, and leave everything else alone. This `Compare()` method can
+tell us if two resources are the same.
+
+The `IFF()` method is part of the whole UID system, which is for discerning if a
+resource meets the requirements another expects for an automatic edge. This is
+because the automatic edge system assumes a unified UID pattern to test for
+equality. In the future it might be helpful or sane to merge the two similar
+comparison functions although for now they are separate because they are
+actually answer different questions.
+
+### Did you know that there is a band named `MGMT`?
+
+I didn't realize this when naming the project, and it is accidental. After much
+anguishing, I chose the name because it was short and I thought it was
+appropriately descriptive. If you need a less ambiguous search term or phrase,
+you can try using `mgmtconfig` or `mgmt config`.
+
+### You didn't answer my question, or I have a question!
+
+It's best to ask on [IRC](https://webchat.freenode.net/?channels=#mgmtconfig)
+to see if someone can help you. Once we get a big enough community going, we'll
+add a mailing list. If you don't get any response from the above, you can
+contact me through my [technical blog](https://ttboj.wordpress.com/contact/)
+and I'll do my best to help. If you have a good question, please add it as a
+patch to this documentation. I'll merge your question, and add a patch with the
+answer!
+
+## Reference
+Please note that there are a number of undocumented options. For more
+information on these options, please view the source at:
+[https://github.com/purpleidea/mgmt/](https://github.com/purpleidea/mgmt/).
+If you feel that a well used option needs documenting here, please patch it!
+
+### Overview of reference
+* [Meta parameters](#meta-parameters): List of available resource meta parameters.
+* [Graph definition file](#graph-definition-file): Main graph definition file.
+* [Command line](#command-line): Command line parameters.
+* [Compilation options](#compilation-options): Compilation options.
+
+### Meta parameters
+These meta parameters are special parameters (or properties) which can apply to
+any resource. The usefulness of doing so will depend on the particular meta
+parameter and resource combination.
+
+#### AutoEdge
+Boolean. Should we generate auto edges for this resource?
+
+#### AutoGroup
+Boolean. Should we attempt to automatically group this resource with others?
+
+#### Noop
+Boolean. Should the Apply portion of the CheckApply method of the resource
+make any changes? Noop is a concatenation of no-operation.
+
+#### Retry
+Integer. The number of times to retry running the resource on error. Use -1 for
+infinite. This currently applies for both the Watch operation (which can fail)
+and for the CheckApply operation. While they could have separate values, I've
+decided to use the same ones for both until there's a proper reason to want to
+do something differently for the Watch errors.
+
+#### Delay
+Integer. Number of milliseconds to wait between retries. The same value is
+shared between the Watch and CheckApply retries. This currently applies for both
+the Watch operation (which can fail) and for the CheckApply operation. While
+they could have separate values, I've decided to use the same ones for both
+until there's a proper reason to want to do something differently for the Watch
+errors.
+
+#### Poll
+Integer. Number of seconds to wait between `CheckApply` checks. If this is
+greater than zero, then the standard event based `Watch` mechanism for this
+resource is replaced with a simple polling mechanism. In general, this is not
+recommended, unless you have a very good reason for doing so.
+
+Please keep in mind that if you have a resource which changes every `I` seconds,
+and you poll it every `J` seconds, and you've asked for a converged timeout of
+`K` seconds, and `I <= J <= K`, then your graph will likely never converge.
+
+When polling, the system detects that a resource is not converged if its
+`CheckApply` method returns false. This allows a resource which changes every
+`I` seconds, and which is polled every `J` seconds, and with a converged timeout
+of `K` seconds to still converge when `J <= K`, as long as `I > J || I > K`,
+which is another way of saying that if the resource finally settles down to give
+the graph enough time, it can probably converge.
+
+#### Limit
+Float. Maximum rate of `CheckApply` runs started per second. Useful to limit
+an especially _eventful_ process from causing excessive checks to run. This
+defaults to `+Infinity` which adds no limiting. If you change this value, you
+will also need to change the `Burst` value to a non-zero value. Please see the
+[rate](https://godoc.org/golang.org/x/time/rate) package for more information.
+
+#### Burst
+Integer. Burst is the maximum number of runs which can happen without invoking
+the rate limiter as designated by the `Limit` value. If the `Limit` is not set
+to `+Infinity`, this must be a non-zero value. Please see the
+[rate](https://godoc.org/golang.org/x/time/rate) package for more information.
+
+#### Sema
+List of string ids. Sema is a P/V style counting semaphore which can be used to
+limit parallelism during the CheckApply phase of resource execution. Each
+resource can have `N` different semaphores which share a graph global namespace.
+Each semaphore has a maximum count associated with it. The default value of the
+size is 1 (one) if size is unspecified. Each string id is the unique id of the
+semaphore. If the id contains a trailing colon (:) followed by a positive
+integer, then that value is the max size for that semaphore. Valid semaphore
+id's include: `some_id`, `hello:42`, `not:smart:4` and `:13`. It is expected
+that the last bare example be only used by the engine to add a global semaphore.
+
+### Graph definition file
+graph.yaml is the compiled graph definition file. The format is currently
+undocumented, but by looking through the [examples/](https://github.com/purpleidea/mgmt/tree/master/examples)
+you can probably figure out most of it, as it's fairly intuitive.
+
+### Command line
+The main interface to the `mgmt` tool is the command line. For the most recent
+documentation, please run `mgmt --help`.
+
+#### `--yaml <graph.yaml>`
+Point to a graph file to run.
+
+#### `--converged-timeout <seconds>`
+Exit if the machine has converged for approximately this many seconds.
+
+#### `--max-runtime <seconds>`
+Exit when the agent has run for approximately this many seconds. This is not
+generally recommended, but may be useful for users who know what they're doing.
+
+#### `--noop`
+Globally force all resources into no-op mode. This also disables the export to
+etcd functionality, but does not disable resource collection, however all
+resources that are collected will have their individual noop settings set.
+
+#### `--sema <size>`
+Globally add a counting semaphore of this size to each resource in the graph.
+The semaphore will get given an id of `:size`. In other words if you specify a
+size of 42, you can expect a semaphore if named: `:42`. It is expected that
+consumers of the semaphore metaparameter always include a prefix to avoid a
+collision with this globally defined semaphore. The size value must be greater
+than zero at this time. The traditional non-parallel execution found in config
+management tools such as `Puppet` can be obtained with `--sema 1`.
+
+#### `--remote <graph.yaml>`
+Point to a graph file to run on the remote host specified within. This parameter
+can be used multiple times if you'd like to remotely run on multiple hosts in
+parallel.
+
+#### `--allow-interactive`
+Allow interactive prompting for SSH passwords if there is no authentication
+method that works.
+
+#### `--ssh-priv-id-rsa`
+Specify the path for finding SSH keys. This defaults to `~/.ssh/id_rsa`. To
+never use this method of authentication, set this to the empty string.
+
+#### `--cconns`
+The maximum number of concurrent remote ssh connections to run. This defaults
+to `0`, which means unlimited.
+
+#### `--no-caching`
+Don't allow remote caching of the remote execution binary. This will require
+the binary to be copied over for every remote execution, but it limits the
+likelihood that there is leftover information from the configuration process.
+
+#### `--prefix <path>`
+Specify a path to a custom working directory prefix. This directory will get
+created if it does not exist. This usually defaults to `/var/lib/mgmt/`. This
+can't be combined with the `--tmp-prefix` option. It can be combined with the
+`--allow-tmp-prefix` option.
+
+#### `--tmp-prefix`
+If this option is specified, a temporary prefix will be used instead of the
+default prefix. This can't be combined with the `--prefix` option.
+
+#### `--allow-tmp-prefix`
+If this option is specified, we will attempt to fall back to a temporary prefix
+if the primary prefix couldn't be created. This is useful for avoiding failures
+in environments where the primary prefix may or may not be available, but you'd
+like to try. The canonical example is when running `mgmt` with `--remote` there
+might be a cached copy of the binary in the primary prefix, but in case there's
+no binary available continue working in a temporary directory to avoid failure.
+
+### Compilation options
+
+You can control some compilation variables by using environment variables.
+
+#### Disable libvirt support
+
+If you wish to compile mgmt without libvirt, you can use the following command:
+
+```
+GOTAGS=novirt make build
+```
+
+#### Disable augeas support
+
+If you wish to compile mgmt without augeas support, you can use the following command:
+
+```
+GOTAGS=noaugeas make build
+```
+
+#### Combining compile-time flags
+
+You can combine multiple tags by using a space-separated list:
+
+```
+GOTAGS="noaugeas novirt" make build
+```
+
+## Examples
+For example configurations, please consult the [examples/](https://github.com/purpleidea/mgmt/tree/master/examples) directory in the git
+source repository. It is available from:
+
+[https://github.com/purpleidea/mgmt/tree/master/examples](https://github.com/purpleidea/mgmt/tree/master/examples)
+
+### Systemd:
+See [`misc/mgmt.service`](misc/mgmt.service) for a sample systemd unit file.
+This unit file is part of the RPM.
+
+To specify your custom options for `mgmt` on a systemd distro:
+
+```bash
+sudo mkdir -p /etc/systemd/system/mgmt.service.d/
+
+cat > /etc/systemd/system/mgmt.service.d/env.conf <<EOF
+# Environment variables:
+MGMT_SEEDS=http://127.0.0.1:2379
+MGMT_CONVERGED_TIMEOUT=-1
+MGMT_MAX_RUNTIME=0
+
+# Other CLI options if necessary.
+#OPTS="--max-runtime=0"
+EOF
+
+sudo systemctl daemon-reload
+```
+
+## Development
+
+This is a project that I started in my free time in 2013. Development is driven
+by all of our collective patches! Dive right in, and start hacking!
+Please contact me if you'd like to invite me to speak about this at your event.
+
+You can follow along [on my technical blog](https://ttboj.wordpress.com/).
+
+To report any bugs, please file a ticket at: [https://github.com/purpleidea/mgmt/issues](https://github.com/purpleidea/mgmt/issues).
+
+## Authors
+
+Copyright (C) 2013-2017+ James Shubin and the project contributors
+
+Please see the
+[AUTHORS](https://github.com/purpleidea/mgmt/tree/master/AUTHORS) file
+for more information.
+
+* [github](https://github.com/purpleidea/)
+* [&#64;purpleidea](https://twitter.com/#!/purpleidea)
+* [https://ttboj.wordpress.com/](https://ttboj.wordpress.com/)

docs/index.rst

@@ -0,0 +1,17 @@
+.. mgmt documentation master file, created by
+   sphinx-quickstart on Wed Feb 15 21:34:09 2017.
+   You can adapt this file completely to your liking, but it should at least
+   contain the root `toctree` directive.
+
+Welcome to mgmt's documentation!
+================================
+
+.. toctree::
+   :maxdepth: 2
+   :caption: Contents:
+
+   documentation
+   quick-start-guide
+   resource-guide
+   prometheus
+   puppet-guide

docs/prometheus.md

@@ -0,0 +1,66 @@
+# Prometheus support
+
+Mgmt comes with a built-in prometheus support. It is disabled by default, and
+can be enabled with the `--prometheus` command line switch.
+
+By default, the prometheus instance will listen on [`127.0.0.1:9233`][pd]. You
+can change this setting by using the `--prometheus-listen` cli option:
+
+To have mgmt prometheus bind interface on 0.0.0.0:45001, use:
+`./mgmt r --prometheus --prometheus-listen :45001`
+
+## Metrics
+
+Mgmt exposes three kinds of resources: _go_ metrics, _etcd_ metrics and _mgmt_
+metrics.
+
+### go metrics
+
+We use the [prometheus go_collector][pgc] to expose go metrics. Those metrics
+are mainly useful for debugging and perf testing.
+
+### etcd metrics
+
+mgmt exposes etcd metrics. Read more in the [upstream documentation][etcdm]
+
+### mgmt metrics
+
+Here is a list of the metrics we provide:
+
+- `mgmt_resources_total`: The number of resources that mgmt is managing
+- `mgmt_checkapply_total`: The number of CheckApply's that mgmt has run
+- `mgmt_failures_total`: The number of resources that have failed
+- `mgmt_failures_current`: The number of resources that have failed
+- `mgmt_graph_start_time_seconds`: Start time of the current graph since unix epoch in seconds
+
+For each metric, you will get some extra labels:
+
+- `kind`: The kind of mgmt resource
+
+For `mgmt_checkapply_total`, those extra labels are set:
+
+- `eventful`: "true" or "false", if the CheckApply triggered some changes
+- `errorful`: "true" or "false", if the CheckApply reported an error
+- `apply`: "true" or "false", if the CheckApply ran in apply or noop mode
+
+## Alerting
+
+You can use prometheus to alert you upon changes or failures. We do not provide
+such templates yet, but we plan to provide some examples in this repository.
+Patches welcome!
+
+## Grafana
+
+We do not have grafana dashboards yet. Patches welcome!
+
+## External resources
+
+- [prometheus website](https://prometheus.io/)
+- [prometheus documentation](https://prometheus.io/docs/introduction/overview/)
+- [prometheus best practices regarding metrics
+  naming](https://prometheus.io/docs/practices/naming/)
+- [grafana website](http://grafana.org/)
+
+[pgc]: https://github.com/prometheus/client_golang/blob/master/prometheus/go_collector.go
+[etcdm]: https://coreos.com/etcd/docs/latest/metrics.html
+[pd]: https://github.com/prometheus/prometheus/wiki/Default-port-allocation

docs/puppet-guide.md

@@ -0,0 +1,166 @@
+# Puppet guide
+
+`mgmt` can use Puppet as its source for the configuration graph.
+This document goes into detail on how this works, and lists
+some pitfalls and limitations.
+
+For basic instructions on how to use the Puppet support, see
+the [main documentation](documentation.md#puppet-support).
+
+## Prerequisites
+
+You need Puppet installed in your system. It is not important how you
+get it. On the most common Linux distributions, you can use packages
+from the OS maintainer, or upstream Puppet repositories. An alternative
+that will also work on OSX is the `puppet` Ruby gem. It also has the
+advantage that you can install any desired version in your home directory
+or any other location.
+
+Any release of Puppet's 3.x and 4.x series should be suitable for use with
+`mgmt`. Most importantly, make sure to install the `ffrank-mgmtgraph` Puppet
+module (referred to below as "the translator module").
+
+```
+puppet module install ffrank-mgmtgraph
+```
+
+Please note that the module is not required on your Puppet master (if you
+use a master/agent setup). It's needed on the machine that runs `mgmt`.
+You can install the module on the master anyway, so that it gets distributed
+to your agents through Puppet's `pluginsync` mechanism.
+
+### Testing the Puppet side
+
+The following command should run successfully and print a YAML hash on your
+terminal:
+
+```puppet
+puppet mgmtgraph print --code 'file { "/tmp/mgmt-test": ensure => present }'
+```
+
+You can use this CLI to test any manifests before handing them straight
+to `mgmt`.
+
+## Writing a suitable manifest
+
+### Unsupported attributes
+
+`mgmt` inherited its resource module from Puppet, so by and large, it's quite
+possible to express `mgmt` graphs in terms of Puppet manifests. However,
+there isn't (and likely never will be) full feature parity between the
+respective resource types. In consequence, a manifest can have semantics that
+cannot be transferred to `mgmt`.
+
+For example, at the time of writing this, the `file` type in `mgmt` had no
+notion of permissions (the file `mode`) yet. This lead to the following
+warning (among others that will be discussed below):
+
+```
+$ puppet mgmtgraph print --code 'file { "/tmp/foo": mode => "0600" }'
+Warning: cannot translate: File[/tmp/foo] { mode => "600" } (attribute is ignored)
+```
+
+This is a heads-up for the user, because the resulting `mgmt` graph will
+in fact not pass this information to the `/tmp/foo` file resource, and
+`mgmt` will ignore this file's permissions. Including such attributes in
+manifests that are written expressly for `mgmt` is not sensible and should
+be avoided.
+
+### Unsupported resources
+
+Puppet has a fairly large number of
+[built-in types](https://docs.puppet.com/puppet/latest/reference/type.html),
+and countless more are available through
+[modules](https://forge.puppet.com/). It's unlikely that all of them will
+eventually receive native counterparts in `mgmt`.
+
+When encountering an unknown resource, the translator module will replace
+it with an `exec` resource in its output. This resource will run the equivalent
+of a `puppet resource` command to make Puppet apply the original resource
+itself. This has quite abysmal performance, because processing such a
+resource requires the forking of at least one Puppet process (two if it
+is found to be out of sync). This comes with considerable overhead.
+On most systems, starting up any Puppet command takes several seconds.
+Compared to the split second that the actual work usually takes,
+this overhead can amount to several orders of magnitude.
+
+Avoid Puppet types that `mgmt` does not implement (yet).
+
+### Avoiding common warnings
+
+Many resource parameters in Puppet take default values. For the most part,
+the translator module just ignores them. However, there are cases in which
+Puppet will default to convenient behavior that `mgmt` cannot quite replicate.
+For example, translating a plain `file` resource will lead to a warning message:
+
+```
+$ puppet mgmtgraph print --code 'file { "/tmp/mgmt-test": }'
+Warning: File[/tmp/mgmt-test] uses the 'puppet' file bucket, which mgmt cannot do. There will be no backup copies!
+```
+
+The reason is that per default, Puppet assumes the following parameter value
+(among others)
+
+```puppet
+file { "/tmp/mgmt-test":
+	backup => 'puppet',
+}
+```
+
+To avoid this, specify the parameter explicitly:
+
+```
+$ puppet mgmtgraph print --code 'file { "/tmp/mgmt-test": backup => false }'
+```
+
+This is tedious in a more complex manifest. A good simplification is the
+following [resource default](https://docs.puppet.com/puppet/latest/reference/lang_defaults.html)
+anywhere on the top scope of your manifest:
+
+```puppet
+File { backup => false }
+```
+
+If you encounter similar warnings from other types and/or parameters,
+use the same approach to silence them if possible.
+
+## Configuring Puppet
+
+Since `mgmt` uses an actual Puppet CLI behind the scenes, you might
+need to tweak some of Puppet's runtime options in order to make it
+do what you want. Reasons for this could be among the following:
+
+* You use the `--puppet agent` variant and need to configure
+`servername`, `certname` and other master/agent-related options.
+* You don't want runtime information to end up in the `vardir`
+that is used by your regular `puppet agent`.
+* You install specific Puppet modules for `mgmt` in a non-standard
+location.
+
+`mgmt` exposes only one Puppet option in order to allow you to
+control all of them, through its `--puppet-conf` option. It allows
+you to specify which `puppet.conf` file should be used during
+translation.
+
+```
+mgmt run --puppet /opt/my-manifest.pp --puppet-conf /etc/mgmt/puppet.conf
+```
+
+Within this file, you can just specify any needed options in the
+`[main]` section:
+
+```
+[main]
+server=mgmt-master.example.net
+vardir=/var/lib/mgmt/puppet
+```
+
+## Caveats
+
+Please see the [README](https://github.com/ffrank/puppet-mgmtgraph/blob/master/README.md)
+of the translator module for the current state of supported and unsupported
+language features.
+
+You should probably make sure to always use the latest release of
+both `ffrank-mgmtgraph` and `ffrank-yamlresource` (the latter is
+getting pulled in as a dependency of the former).

docs/quick-start-guide.md

@@ -0,0 +1,93 @@
+# Quick start guide
+
+## Introduction
+This guide is intended for developers. Once `mgmt` is minimally viable, we'll
+publish a quick start guide for users too. In the meantime, please contribute!
+If you're brand new to `mgmt`, it's probably a good idea to start by reading the
+[introductory article](https://ttboj.wordpress.com/2016/01/18/next-generation-configuration-mgmt/)
+or to watch an [introductory video](https://github.com/purpleidea/mgmt/#on-the-web).
+Once you're familiar with the general idea, please start hacking...
+
+## Vagrant
+If you would like to avoid doing the following steps manually, we have prepared
+a [Vagrant](https://www.vagrantup.com/) environment for your convenience. From
+the project directory, run a `vagrant up`, and then a `vagrant status`. From
+there, you can `vagrant ssh` into the `mgmt` machine. The MOTD will explain the
+rest.
+
+## Dependencies
+Software projects have a few different kinds of dependencies. There are _build_
+dependencies, _runtime_ dependencies, and additionally, a few extra dependencies
+required for running the _test_ suite.
+
+### Build
+* `golang` 1.6 or higher (required, available in most distros)
+* golang libraries (required, available with `go get ./...`) a partial list includes:
+```
+github.com/coreos/etcd/client
+gopkg.in/yaml.v2
+gopkg.in/fsnotify.v1
+github.com/urfave/cli
+github.com/coreos/go-systemd/dbus
+github.com/coreos/go-systemd/util
+github.com/libvirt/libvirt-go
+```
+* `stringer` (optional), available as a package on some platforms, otherwise via `go get`
+```
+golang.org/x/tools/cmd/stringer
+```
+* `pandoc` (optional), for building a pdf of the documentation
+
+### Runtime
+A relatively modern GNU/Linux system should be able to run `mgmt` without any
+problems. Since `mgmt` runs as a single statically compiled binary, all of the
+library dependencies are included. It is expected, that certain advanced
+resources require host specific facilities to work. These requirements are
+listed below:
+
+| Resource | Dependency        | Version |
+|----------|-------------------|---------|
+| file     | inotify           | ?       |
+| hostname | systemd-hostnamed | ?       |
+| nspawn   | systemd-nspawn    | ?       |
+| pkg      | packagekitd       | ?       |
+| svc      | systemd           | ?       |
+| virt     | libvirtd          | ?       |
+
+For building a visual representation of the graph, `graphviz` is required.
+
+### Testing
+* golint `github.com/golang/lint/golint`
+
+## Quick start
+* Make sure you have golang version 1.6 or greater installed.
+* If you do not have a GOPATH yet, create one and export it:
+```
+mkdir $HOME/gopath
+export GOPATH=$HOME/gopath
+```
+* You might also want to add the GOPATH to your `~/.bashrc` or `~/.profile`.
+* For more information you can read the [GOPATH documentation](https://golang.org/cmd/go/#hdr-GOPATH_environment_variable).
+* Next download the mgmt code base, and switch to that directory:
+```
+mkdir -p $GOPATH/src/github.com/purpleidea/
+cd $GOPATH/src/github.com/purpleidea/
+git clone --recursive https://github.com/purpleidea/mgmt/
+cd $GOPATH/src/github.com/purpleidea/mgmt
+```
+* Run `make deps` to install system and golang dependencies. Take a look at `misc/make-deps.sh` for details.
+* Run `make build` to get a freshly built `mgmt` binary.
+* Run `time ./mgmt run --yaml examples/graph0.yaml --converged-timeout=5 --tmp-prefix` to try out a very simple example!
+* To run continuously in the default mode of operation, omit the `--converged-timeout` option.
+* Have fun hacking on our future technology!
+
+## Examples
+Please look in the [examples/](../examples/) folder for some examples!
+
+## Installation
+Installation of `mgmt` from distribution packages currently needs improvement.
+At the moment we have:
+* [COPR](https://copr.fedoraproject.org/coprs/purpleidea/mgmt/)
+* [Arch](https://aur.archlinux.org/packages/mgmt/)
+
+Please contribute more! We'd especially like to see a Debian package!

docs/resource-guide.md

@@ -0,0 +1,575 @@
+# Resource guide
+
+## Overview
+
+The `mgmt` tool has built-in resource primitives which make up the building
+blocks of any configuration. Each instance of a resource is mapped to a single
+vertex in the resource [graph](https://en.wikipedia.org/wiki/Directed_acyclic_graph).
+This guide is meant to instruct developers on how to write a brand new resource.
+Since `mgmt` and the core resources are written in golang, some prior golang
+knowledge is assumed.
+
+## Theory
+
+Resources in `mgmt` are similar to resources in other systems in that they are
+[idempotent](https://en.wikipedia.org/wiki/Idempotence). Our resources are
+uniquely different in that they can detect when their state has changed, and as
+a result can run to revert or repair this change instantly. For some background
+on this design, please read the
+[original article](https://ttboj.wordpress.com/2016/01/18/next-generation-configuration-mgmt/)
+on the subject.
+
+## Resource API
+
+To implement a resource in `mgmt` it must satisfy the
+[`Res`](https://github.com/purpleidea/mgmt/blob/master/resources/resources.go)
+interface. What follows are each of the method signatures and a description of
+each.
+
+### Default
+```golang
+Default() Res
+```
+
+This returns a populated resource struct as a `Res`. It shouldn't populate any
+values which already have the correct default as the golang zero value. In
+general it is preferable if the zero values make for the correct defaults.
+
+#### Example
+```golang
+// Default returns some sensible defaults for this resource.
+func (obj *FooRes) Default() Res {
+	return &FooRes{
+		Answer: 42, // sometimes, defaults shouldn't be the zero value
+	}
+}
+```
+
+### Validate
+```golang
+Validate() error
+```
+
+This method is used to validate if the populated resource struct is a valid
+representation of the resource kind. If it does not conform to the resource
+specifications, it should generate an error. If you notice that this method is
+quite large, it might be an indication that you should reconsider the parameter
+list and interface to this resource. This method is called _before_ `Init`.
+
+#### Example
+```golang
+// Validate reports any problems with the struct definition.
+func (obj *FooRes) Validate() error {
+	if obj.Answer != 42 { // validate whatever you want
+		return fmt.Errorf("expected an answer of 42")
+	}
+	return obj.BaseRes.Validate() // remember to call the base method!
+}
+```
+
+### Init
+```golang
+Init() error
+```
+
+This is called to initialize the resource. If something goes wrong, it should
+return an error. It should set the resource `kind`, do any resource specific
+work, and finish by calling the `Init` method of the base resource.
+
+#### Example
+```golang
+// Init initializes the Foo resource.
+func (obj *FooRes) Init() error {
+	obj.BaseRes.kind = "foo" // must lower case resource kind
+	// run the resource specific initialization, and error if anything fails
+	if some_error {
+		return err // something went wrong!
+	}
+	return obj.BaseRes.Init() // call the base resource init
+}
+```
+
+This method is always called after `Validate` has run successfully, with the
+exception that we can't prevent a malicious or buggy `libmgmt` user to not run
+this. In other words, you should expect `Validate` to have run first, but you
+shouldn't allow `Init` to dangerously `rm -rf /$the_world` if your code only
+checks `$the_world` in `Validate`. Remember to always program safely!
+
+### Close
+```golang
+Close() error
+```
+
+This is called to cleanup after the resource. It is usually not necessary, but
+can be useful if you'd like to properly close a persistent connection that you
+opened in the `Init` method and were using throughout the resource.
+
+#### Example
+```golang
+// Close runs some cleanup code for this resource.
+func (obj *FooRes) Close() error {
+	err := obj.conn.Close() // close some internal connection
+
+	// call base close, b/c we're overriding
+	if e := obj.BaseRes.Close(); err == nil {
+		err = e
+	} else if e != nil {
+		err = multierr.Append(err, e) // list of errors
+	}
+	return err
+}
+```
+
+You should probably check the return errors of your internal methods, and pass
+on an error if something went wrong. Remember to always call the base `Close`
+method! If you plan to return early if you hit an internal error, then at least
+call it with a defer!
+
+### CheckApply
+```golang
+CheckApply(apply bool) (checkOK bool, err error)
+```
+
+`CheckApply` is where the real _work_ is done. Under normal circumstances, this
+function should check if the state of this resource is correct, and if so, it
+should return: `(true, nil)`. If the `apply` variable is set to `true`, then
+this means that we should then proceed to run the changes required to bring the
+resource into the correct state. If the `apply` variable is set to `false`, then
+the resource is operating in _noop_ mode and _no operations_ should be executed!
+
+After having executed the necessary operations to bring the resource back into
+the desired state, or after having detected that the state was incorrect, but
+that changes can't be made because `apply` is `false`, you should then return
+`(false, nil)`.
+
+You must cause the resource to converge during a single execution of this
+function. If you cannot, then you must return an error! The exception to this
+rule is that if an external force changes the state of the resource while it is
+being remedied, it is possible to return from this function even though the
+resource isn't now converged. This is not a bug, as the resources `Watch`
+facility will detect the change, ultimately resulting in a subsequent call to
+`CheckApply`.
+
+#### Example
+```golang
+// CheckApply does the idempotent work of checking and applying resource state.
+func (obj *FooRes) CheckApply(apply bool) (bool, error) {
+	// check the state
+	if state_is_okay { return true, nil } // done early! :)
+	// state was bad
+	if !apply { return false, nil } // don't apply; !stateok, nil
+	// do the apply!
+	return false, nil // after success applying
+	if any_error { return false, err } // anytime there's an err!
+}
+```
+
+The `CheckApply` function is called by the `mgmt` engine when it believes a call
+is necessary. Under certain conditions when a `Watch` call does not invalidate
+the state of the resource, and no refresh call was sent, its execution might be
+skipped. This is an engine optimization, and not a bug. It is mentioned here in
+the documentation in case you are confused as to why a debug message you've
+added to the code isn't always printed.
+
+#### Refresh notifications
+Some resources may choose to support receiving refresh notifications. In general
+these should be avoided if possible, but nevertheless, they do make sense in
+certain situations. Resources that support these need to verify if one was sent
+during the CheckApply phase of execution. This is accomplished by calling the
+`Refresh() bool` method of the resource, and inspecting the return value. This
+is only necessary if you plan to perform a refresh action. Refresh actions
+should still respect the `apply` variable, and no system changes should be made
+if it is `false`. Refresh notifications are generated by any resource when an
+action is applied by that resource and are transmitted through graph edges which
+have enabled their propagation. Resources that currently perform some refresh
+action include `svc`, `timer`, and `password`.
+
+#### Paired execution
+For many resources it is not uncommon to see `CheckApply` run twice in rapid
+succession. This is usually not a pathological occurrence, but rather a healthy
+pattern which is a consequence of the event system. When the state of the
+resource is incorrect, `CheckApply` will run to remedy the state. In response to
+having just changed the state, it is usually the case that this repair will
+trigger the `Watch` code! In response, a second `CheckApply` is triggered, which
+will likely find the state to now be correct.
+
+#### Summary
+* Anytime an error occurs during `CheckApply`, you should return `(false, err)`.
+* If the state is correct and no changes are needed, return `(true, nil)`.
+* You should only make changes to the system if `apply` is set to `true`.
+* After checking the state and possibly applying the fix, return `(false, nil)`.
+* Returning `(true, err)` is a programming error and will cause a `Fatal`.
+
+### Watch
+```golang
+Watch(chan *Event) error
+```
+
+`Watch` is a main loop that runs and sends messages when it detects that the
+state of the resource might have changed. To send a message you should write to
+the input event channel using the `Event` helper method. The Watch function
+should run continuously until a shutdown message is received. If at any time
+something goes wrong, you should return an error, and the `mgmt` engine will
+handle possibly restarting the main loop based on the `retry` meta parameters.
+
+It is better to send an event notification which turns out to be spurious, than
+to miss a possible event. Resources which can miss events are incorrect and need
+to be re-engineered so that this isn't the case. If you have an idea for a
+resource which would fit this criteria, but you can't find a solution, please
+contact the `mgmt` maintainers so that this problem can be investigated and a
+possible system level engineering fix can be found.
+
+You may have trouble deciding how much resource state checking should happen in
+the `Watch` loop versus deferring it all to the `CheckApply` method. You may
+want to put some simple fast path checking in `Watch` to avoid generating
+obviously spurious events, but in general it's best to keep the `Watch` method
+as simple as possible. Contact the `mgmt` maintainers if you're not sure.
+
+If the resource is activated in `polling` mode, the `Watch` method will not get
+executed. As a result, the resource must still work even if the main loop is not
+running.
+
+#### Select
+The lifetime of most resources `Watch` method should be spent in an infinite
+loop that is bounded by a `select` call. The `select` call is the point where
+our method hands back control to the engine (and the kernel) so that we can
+sleep until something of interest wakes us up. In this loop we must process
+events from the engine via the `<-obj.Events()` call, and receive events for our
+resource itself!
+
+#### Events
+If we receive an internal event from the `<-obj.Events()` method, we can read it
+with the ReadEvent helper function. This function tells us if we should shutdown
+our resource, and if we should generate an event. When we want to send an event,
+we use the `Event` helper function. It is also important to mark the resource
+state as `dirty` if we believe it might have changed. We do this with the
+`StateOK(false)` function.
+
+#### Startup
+Once the `Watch` function has finished starting up successfully, it is important
+to generate one event to notify the `mgmt` engine that we're now listening
+successfully, so that it can run an initial `CheckApply` to ensure we're safely
+tracking a healthy state and that we didn't miss anything when `Watch` was down
+or from before `mgmt` was running. It does this by calling the `Running` method.
+
+#### Converged
+The engine might be asked to shutdown when the entire state of the system has
+not seen any changes for some duration of time. The engine can determine this
+automatically, but each resource can block this if it is absolutely necessary.
+To do this, the `Watch` method should get the `ConvergedUID` handle that has
+been prepared for it by the engine. This is done by calling the `ConvergerUID`
+method on the resource object. The result can be used to set the converged
+status with `SetConverged`, and to notify when the particular timeout has been
+reached by waiting on `ConvergedTimer`.
+
+Instead of interacting with the `ConvergedUID` with these two methods, we can
+instead use the `StartTimer` and `ResetTimer` methods which accomplish the same
+thing, but provide a `select`-free interface for different coding situations.
+
+This particular facility is most likely not required for most resources. It may
+prove to be useful if a resource wants to start off a long operation, but avoid
+sending out erroneous `Event` messages to keep things alive until it finishes.
+
+#### Example
+```golang
+// Watch is the listener and main loop for this resource.
+func (obj *FooRes) Watch() error {
+	// setup the Foo resource
+	var err error
+	if err, obj.foo = OpenFoo(); err != nil {
+		return err // we couldn't startup
+	}
+	defer obj.whatever.CloseFoo() // shutdown our
+
+	// notify engine that we're running
+	if err := obj.Running(); err != nil {
+		return err // bubble up a NACK...
+	}
+
+	var send = false // send event?
+	var exit *error
+	for {
+		select {
+		case event := <-obj.Events():
+			// we avoid sending events on unpause
+			if exit, send = obj.ReadEvent(event); exit != nil {
+				return *exit // exit
+			}
+
+		// the actual events!
+		case event := <-obj.foo.Events:
+			if is_an_event {
+				send = true // used below
+				obj.StateOK(false) // dirty
+			}
+
+		// event errors
+		case err := <-obj.foo.Errors:
+			return err // will cause a retry or permanent failure
+		}
+
+		// do all our event sending all together to avoid duplicate msgs
+		if send {
+			send = false
+			obj.Event() // send the event!
+		}
+	}
+}
+```
+
+#### Summary
+* Remember to call the appropriate `converger` methods throughout the resource.
+* Remember to call `Startup` when the `Watch` is running successfully.
+* Remember to process internal events and shutdown promptly if asked to.
+* Ensure the design of your resource is well thought out.
+* Have a look at the existing resources for a rough idea of how this all works.
+
+### Compare
+```golang
+Compare(Res) bool
+```
+
+Each resource must have a `Compare` method. This takes as input another resource
+and must return whether they are identical or not. This is used for identifying
+if an existing resource can be used in place of a new one with a similar set of
+parameters. In particular, when switching from one graph to a new (possibly
+identical) graph, this avoids recomputing the state for resources which don't
+change or that are sufficiently similar that they don't need to be swapped out.
+
+In general if all the resource properties are identical, then they usually don't
+need to be changed. On occasion, not all of them need to be compared, in
+particular if they store some generated state, or if they aren't significant in
+some way.
+
+#### Example
+```golang
+// Compare two resources and return if they are equivalent.
+func (obj *FooRes) Compare(res Res) bool {
+	switch res.(type) {
+	case *FooRes: // only compare to other resources of the Foo kind!
+		res := res.(*FileRes)
+		if !obj.BaseRes.Compare(res) { // call base Compare
+			return false
+		}
+		if obj.Name != res.Name {
+			return false
+		}
+		if obj.whatever != res.whatever {
+			return false
+		}
+		if obj.Flag != res.Flag {
+			return false
+		}
+	default:
+		return false // different kind of resource
+	}
+	return true // they must match!
+}
+```
+
+### UIDs
+```golang
+UIDs() []ResUID
+```
+
+The `UIDs` method returns a list of `ResUID` interfaces that represent the
+particular resource uniquely. This is used with the AutoEdges API to determine
+if another resource can match a dependency to this one.
+
+### AutoEdges
+```golang
+AutoEdges() AutoEdge
+```
+
+This returns a struct that implements the `AutoEdge` interface. This struct
+is used to match other resources that might be relevant dependencies for this
+resource.
+
+### CollectPattern
+```golang
+CollectPattern() string
+```
+
+This is currently a stub and will be updated once the DSL is further along.
+
+### UnmarshalYAML
+```golang
+UnmarshalYAML(unmarshal func(interface{}) error) error // optional
+```
+
+This is optional, but recommended for any resource that will have a YAML
+accessible struct, and an entry in the `GraphConfig` struct. It is not required
+because to do so would mean that third-party or custom resources (such as those
+someone writes to use with `libmgmt`) would have to implement this needlessly.
+
+The signature intentionally matches what is required to satisfy the `go-yaml`
+[Unmarshaler](https://godoc.org/gopkg.in/yaml.v2#Unmarshaler) interface.
+
+#### Example
+```golang
+// UnmarshalYAML is the custom unmarshal handler for this struct.
+// It is primarily useful for setting the defaults.
+func (obj *FooRes) UnmarshalYAML(unmarshal func(interface{}) error) error {
+	type rawRes FooRes // indirection to avoid infinite recursion
+
+	def := obj.Default()     // get the default
+	res, ok := def.(*FooRes) // put in the right format
+	if !ok {
+		return fmt.Errorf("could not convert to FooRes")
+	}
+	raw := rawRes(*res) // convert; the defaults go here
+
+	if err := unmarshal(&raw); err != nil {
+		return err
+	}
+
+	*obj = FooRes(raw) // restore from indirection with type conversion!
+	return nil
+}
+```
+
+## Further considerations
+There is some additional information that any resource writer will need to know.
+Each issue is listed separately below!
+
+### Resource struct
+Each resource will implement methods as pointer receivers on a resource struct.
+The resource struct must include an anonymous reference to the `BaseRes` struct.
+The naming convention for resources is that they end with a `Res` suffix. If
+you'd like your resource to be accessible by the `YAML` graph API (GAPI), then
+you'll need to include the appropriate YAML fields as shown below.
+
+#### Example
+```golang
+type FooRes struct {
+	BaseRes `yaml:",inline"` // base properties
+
+	Whatever string `yaml:"whatever"` // you pick!
+	Bar int // no yaml, used as public output value for send/recv
+	Baz bool `yaml:"baz"` // something else
+
+	something string // some private field
+}
+```
+
+### YAML
+In addition to labelling your resource struct with YAML fields, you must also
+add an entry to the internal `GraphConfig` struct. It is a fairly straight
+forward one line patch.
+
+```golang
+type GraphConfig struct {
+// [snip...]
+	Resources struct {
+		Noop []*resources.NoopRes `yaml:"noop"`
+		File []*resources.FileRes `yaml:"file"`
+		// [snip...]
+		Foo []*resources.FooRes `yaml:"foo"` // tada :)
+	}
+}
+```
+
+It's also recommended that you add the [UnmarshalYAML](#unmarshalyaml) method to
+your resources so that unspecified values are given sane defaults.
+
+### Gob registration
+All resources must be registered with the `golang` _gob_ module so that they can
+be encoded and decoded. Make sure to include the following code snippet for this
+to work.
+
+```golang
+import "encoding/gob"
+func init() { // special golang method that runs once
+	gob.Register(&FooRes{}) // substitude your resource here
+}
+```
+
+## Automatic edges
+Automatic edges in `mgmt` are well described in [this article](https://ttboj.wordpress.com/2016/03/14/automatic-edges-in-mgmt/).
+The best example of this technique can be seen in the `svc` resource.
+Unfortunately no further documentation about this subject has been written. To
+expand this section, please send a patch! Please contact us if you'd like to
+work on a resource that uses this feature, or to add it to an existing one!
+
+## Automatic grouping
+Automatic grouping in `mgmt` is well described in [this article](https://ttboj.wordpress.com/2016/03/30/automatic-grouping-in-mgmt/).
+The best example of this technique can be seen in the `pkg` resource.
+Unfortunately no further documentation about this subject has been written. To
+expand this section, please send a patch! Please contact us if you'd like to
+work on a resource that uses this feature, or to add it to an existing one!
+
+
+## Send/Recv
+In `mgmt` there is a novel concept called _Send/Recv_. For some background,
+please [read the introductory article](https://ttboj.wordpress.com/2016/12/07/sendrecv-in-mgmt/).
+When using this feature, the engine will automatically send the user specified
+value to the intended destination without requiring any resource specific code.
+Any time that one of the destination values is changed, the engine automatically
+marks the resource state as `dirty`. To detect if a particular value was
+received, and if it changed (during this invocation of CheckApply) from the
+previous value, you can query the Recv parameter. It will contain a `map` of all
+the keys which can be received on, and the value has a `Changed` property which
+will indicate whether the value was updated on this particular `CheckApply`
+invocation. The type of the sending key must match that of the receiving one.
+This can _only_ be done inside of the `CheckApply` function!
+
+```golang
+// inside CheckApply, probably near the top
+if val, exists := obj.Recv["SomeKey"]; exists {
+	log.Printf("SomeKey was sent to us from: %s[%s].%s", val.Res.Kind(), val.Res.GetName(), val.Key)
+	if val.Changed {
+		log.Printf("SomeKey was just updated!")
+		// you may want to invalidate some local cache
+	}
+}
+```
+
+Astute readers will note that there isn't anything that prevents a user from
+sending an identically typed value to some arbitrary (public) key that the
+resource author hadn't considered! While this is true, resources should probably
+work within this problem space anyways. The rule of thumb is that any public
+parameter which is normally used in a resource can be used safely.
+
+One subtle scenario is that if a resource creates a local cache or stores a
+computation that depends on the value of a public parameter and will require
+invalidation should that public parameter change, then you must detect that
+scenario and invalidate the cache when it occurs. This *must* be processed
+before there is a possibility of failure in CheckApply, because if we fail (and
+possibly run again) the subsequent send->recv transfer might not have a new
+value to copy, and therefore we won't see this notification of change.
+Therefore, it is important to process these promptly, if they must not be lost,
+such as for cache invalidation.
+
+Remember, `Send/Recv` only changes your resource code if you cache state.
+
+## Composite resources
+Composite resources are resources which embed one or more existing resources.
+This is useful to prevent code duplication in higher level resource scenarios.
+The best example of this technique can be seen in the `nspawn` resource which
+can be seen to partially embed a `svc` resource, but without its `Watch`.
+Unfortunately no further documentation about this subject has been written. To
+expand this section, please send a patch! Please contact us if you'd like to
+work on a resource that uses this feature, or to add it to an existing one!
+
+## Frequently asked questions
+(Send your questions as a patch to this FAQ! I'll review it, merge it, and
+respond by commit with the answer.)
+
+### Can I write resources in a different language?
+Currently `golang` is the only supported language for built-in resources. We
+might consider allowing external resources to be imported in the future. This
+will likely require a language that can expose a C-like API, such as `python` or
+`ruby`. Custom `golang` resources are already possible when using mgmt as a lib.
+Higher level resource collections will be possible once the `mgmt` DSL is ready.
+
+### What new resource primitives need writing?
+There are still many ideas for new resources that haven't been written yet. If
+you'd like to contribute one, please contact us and tell us about your idea!
+
+### Where can I find more information about mgmt?
+Additional blog posts, videos and other material [is available!](https://github.com/purpleidea/mgmt/#on-the-web).
+
+## Suggestions
+If you have any ideas for API changes or other improvements to resource writing,
+please let us know! We're still pre 1.0 and pre 0.1 and happy to break API in
+order to get it right!

etcd.go

@@ -1,300 +0,0 @@
-// Mgmt
-// Copyright (C) 2013-2016+ James Shubin and the project contributors
-// Written by James Shubin <james@shubin.ca> and the project contributors
-//
-// This program is free software: you can redistribute it and/or modify
-// it under the terms of the GNU Affero General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-//
-// This program is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-// GNU Affero General Public License for more details.
-//
-// You should have received a copy of the GNU Affero General Public License
-// along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
-package main
-
-import (
-	"fmt"
-	etcd_context "github.com/coreos/etcd/Godeps/_workspace/src/golang.org/x/net/context"
-	etcd "github.com/coreos/etcd/client"
-	"log"
-	"math"
-	"strings"
-	"time"
-)
-
-//go:generate stringer -type=etcdMsg -output=etcdmsg_stringer.go
-type etcdMsg int
-
-const (
-	etcdStart etcdMsg = iota
-	etcdEvent
-	etcdFoo
-	etcdBar
-)
-
-//go:generate stringer -type=etcdConvergedState -output=etcdconvergedstate_stringer.go
-type etcdConvergedState int
-
-const (
-	etcdConvergedNil etcdConvergedState = iota
-	//etcdConverged
-	etcdConvergedTimeout
-)
-
-type EtcdWObject struct { // etcd wrapper object
-	seed           string
-	ctimeout       int
-	converged      chan bool
-	kapi           etcd.KeysAPI
-	convergedState etcdConvergedState
-}
-
-func (etcdO *EtcdWObject) GetConvergedState() etcdConvergedState {
-	return etcdO.convergedState
-}
-
-func (etcdO *EtcdWObject) SetConvergedState(state etcdConvergedState) {
-	etcdO.convergedState = state
-}
-
-func (etcdO *EtcdWObject) GetKAPI() etcd.KeysAPI {
-	if etcdO.kapi != nil { // memoize
-		return etcdO.kapi
-	}
-
-	cfg := etcd.Config{
-		Endpoints: []string{etcdO.seed},
-		Transport: etcd.DefaultTransport,
-		// set timeout per request to fail fast when the target endpoint is unavailable
-		HeaderTimeoutPerRequest: time.Second,
-	}
-
-	var c etcd.Client
-	var err error
-
-	c, err = etcd.New(cfg)
-	if err != nil {
-		// XXX: not sure if this ever errors
-		if cerr, ok := err.(*etcd.ClusterError); ok {
-			// XXX: not sure if this part ever matches
-			// not running or disconnected
-			if cerr == etcd.ErrClusterUnavailable {
-				log.Fatal("XXX: etcd: ErrClusterUnavailable")
-			} else {
-				log.Fatal("XXX: etcd: Unknown")
-			}
-		}
-		log.Fatal(err) // some unhandled error
-	}
-	etcdO.kapi = etcd.NewKeysAPI(c)
-	return etcdO.kapi
-}
-
-type EtcdChannelWatchResponse struct {
-	resp *etcd.Response
-	err  error
-}
-
-// wrap the etcd watcher.Next blocking function inside of a channel
-func (etcdO *EtcdWObject) EtcdChannelWatch(watcher etcd.Watcher, context etcd_context.Context) chan *EtcdChannelWatchResponse {
-	ch := make(chan *EtcdChannelWatchResponse)
-	go func() {
-		for {
-			resp, err := watcher.Next(context) // blocks here
-			ch <- &EtcdChannelWatchResponse{resp, err}
-		}
-	}()
-	return ch
-}
-
-func (etcdO *EtcdWObject) EtcdWatch() chan etcdMsg {
-	kapi := etcdO.GetKAPI()
-	ctimeout := etcdO.ctimeout
-	converged := etcdO.converged
-	// XXX: i think we need this buffered so that when we're hanging on the
-	// channel, which is inside the EtcdWatch main loop, we still want the
-	// calls to Get/Set on etcd to succeed, so blocking them here would
-	// kill the whole thing
-	ch := make(chan etcdMsg, 1) // XXX: buffer of at least 1 is required
-	go func(ch chan etcdMsg) {
-		tmin := 500   // initial (min) delay in ms
-		t := tmin     // current time
-		tmult := 2    // multiplier for exponential delay
-		tmax := 16000 // max delay
-		watcher := kapi.Watcher("/exported/", &etcd.WatcherOptions{Recursive: true})
-		etcdch := etcdO.EtcdChannelWatch(watcher, etcd_context.Background())
-		for {
-			log.Printf("Etcd: Watching...")
-			var resp *etcd.Response // = nil by default
-			var err error
-			select {
-			case out := <-etcdch:
-				etcdO.SetConvergedState(etcdConvergedNil)
-				resp, err = out.resp, out.err
-
-			case _ = <-TimeAfterOrBlock(ctimeout):
-				etcdO.SetConvergedState(etcdConvergedTimeout)
-				converged <- true
-				continue
-			}
-
-			if err != nil {
-				if err == etcd_context.Canceled {
-					// ctx is canceled by another routine
-					log.Fatal("Canceled")
-				} else if err == etcd_context.DeadlineExceeded {
-					// ctx is attached with a deadline and it exceeded
-					log.Fatal("Deadline")
-				} else if cerr, ok := err.(*etcd.ClusterError); ok {
-					// not running or disconnected
-					// TODO: is there a better way to parse errors?
-					for _, e := range cerr.Errors {
-						if strings.HasSuffix(e.Error(), "getsockopt: connection refused") {
-							t = int(math.Min(float64(t*tmult), float64(tmax)))
-							log.Printf("Etcd: Waiting %d ms for connection...", t)
-							time.Sleep(time.Duration(t) * time.Millisecond) // sleep for t ms
-
-						} else if e.Error() == "unexpected EOF" {
-							log.Printf("Etcd: Unexpected disconnect...")
-
-						} else if e.Error() == "EOF" {
-							log.Printf("Etcd: Disconnected...")
-
-						} else if strings.HasPrefix(e.Error(), "unsupported protocol scheme") {
-							// usually a bad peer endpoint value
-							log.Fatal("Bad peer endpoint value?")
-
-						} else {
-							log.Fatal("Woops: ", e.Error())
-						}
-					}
-				} else {
-					// bad cluster endpoints, which are not etcd servers
-					log.Fatal("Woops: ", err)
-				}
-			} else {
-				//log.Print(resp)
-				//log.Printf("Watcher().Node.Value(%v): %+v", key, resp.Node.Value)
-				// FIXME: we should actually reset when the server comes back, not here on msg!
-				//XXX: can we fix this with one of these patterns?: https://blog.golang.org/go-concurrency-patterns-timing-out-and
-				t = tmin // reset timer
-
-				// don't trigger event if nothing changed
-				if n, p := resp.Node, resp.PrevNode; resp.Action == "set" && p != nil {
-					if n.Key == p.Key && n.Value == p.Value {
-						continue
-					}
-				}
-
-				// FIXME: we get events on key/type/value changes for
-				// each type directory... ignore the non final ones...
-				// IOW, ignore everything except for the value or some
-				// field which gets set last... this could be the max count field thing...
-
-				log.Printf("Etcd: Value: %v", resp.Node.Value) // event
-				ch <- etcdEvent                                // event
-			}
-
-		} // end for loop
-		//close(ch)
-	}(ch) // call go routine
-	return ch
-}
-
-// helper function to store our data in etcd
-func (etcdO *EtcdWObject) EtcdPut(hostname, key, typ string, obj interface{}) bool {
-	kapi := etcdO.GetKAPI()
-	output, ok := ObjToB64(obj)
-	if !ok {
-		log.Printf("Etcd: Could not encode %v key.", key)
-		return false
-	}
-
-	path := fmt.Sprintf("/exported/%s/types/%s/type", hostname, key)
-	_, err := kapi.Set(etcd_context.Background(), path, typ, nil)
-	// XXX validate...
-
-	path = fmt.Sprintf("/exported/%s/types/%s/value", hostname, key)
-	resp, err := kapi.Set(etcd_context.Background(), path, output, nil)
-	if err != nil {
-		if cerr, ok := err.(*etcd.ClusterError); ok {
-			// not running or disconnected
-			for _, e := range cerr.Errors {
-				if strings.HasSuffix(e.Error(), "getsockopt: connection refused") {
-				}
-				//if e == etcd.ErrClusterUnavailable
-			}
-		}
-		log.Printf("Etcd: Could not store %v key.", key)
-		return false
-	}
-	log.Print("Etcd: ", resp) // w00t... bonus
-	return true
-}
-
-// lookup /exported/ node hierarchy
-func (etcdO *EtcdWObject) EtcdGet() (etcd.Nodes, bool) {
-	kapi := etcdO.GetKAPI()
-	// key structure is /exported/<hostname>/types/...
-	resp, err := kapi.Get(etcd_context.Background(), "/exported/", &etcd.GetOptions{Recursive: true})
-	if err != nil {
-		return nil, false // not found
-	}
-	return resp.Node.Nodes, true
-}
-
-func (etcdO *EtcdWObject) EtcdGetProcess(nodes etcd.Nodes, typ string) []string {
-	//path := fmt.Sprintf("/exported/%s/types/", h)
-	top := "/exported/"
-	log.Printf("Etcd: Get: %+v", nodes) // Get().Nodes.Nodes
-	var output []string
-
-	for _, x := range nodes { // loop through hosts
-		if !strings.HasPrefix(x.Key, top) {
-			log.Fatal("Error!")
-		}
-		host := x.Key[len(top):]
-		//log.Printf("Get().Nodes[%v]: %+v ==> %+v", -1, host, x.Nodes)
-		//log.Printf("Get().Nodes[%v]: %+v ==> %+v", i, x.Key, x.Nodes)
-		types, ok := EtcdGetChildNodeByKey(x, "types")
-		if !ok {
-			continue
-		}
-		for _, y := range types.Nodes { // loop through types
-			//key := y.Key # UUID?
-			//log.Printf("Get(%v): TYPE[%v]", host, y.Key)
-			t, ok := EtcdGetChildNodeByKey(y, "type")
-			if !ok {
-				continue
-			}
-			if typ != "" && typ != t.Value {
-				continue
-			} // filter based on type
-
-			v, ok := EtcdGetChildNodeByKey(y, "value") // B64ToObj this
-			if !ok {
-				continue
-			}
-			log.Printf("Etcd: Hostname: %v; Get: %v", host, t.Value)
-
-			output = append(output, v.Value)
-		}
-	}
-	return output
-}
-
-// TODO: wrap this somehow so it's a method of *etcd.Node
-// helper function that returns the node for a particular key under a node
-func EtcdGetChildNodeByKey(node *etcd.Node, key string) (*etcd.Node, bool) {
-	for _, x := range node.Nodes {
-		if x.Key == fmt.Sprintf("%s/%s", node.Key, key) {
-			return x, true
-		}
-	}
-	return nil, false // not found
-}

etcd/str.go

@@ -0,0 +1,115 @@
+// Mgmt
+// Copyright (C) 2013-2017+ James Shubin and the project contributors
+// Written by James Shubin <james@shubin.ca> and the project contributors
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package etcd
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/purpleidea/mgmt/util"
+
+	etcd "github.com/coreos/etcd/clientv3"
+	errwrap "github.com/pkg/errors"
+)
+
+// WatchStr returns a channel which spits out events on key activity.
+// FIXME: It should close the channel when it's done, and spit out errors when
+// something goes wrong.
+func WatchStr(obj *EmbdEtcd, key string) chan error {
+	// new key structure is /$NS/strings/$key/$hostname = $data
+	path := fmt.Sprintf("/%s/strings/%s", NS, key)
+	ch := make(chan error, 1)
+	// FIXME: fix our API so that we get a close event on shutdown.
+	callback := func(re *RE) error {
+		// TODO: is this even needed? it used to happen on conn errors
+		//log.Printf("Etcd: Watch: Path: %v", path) // event
+		if re == nil || re.response.Canceled {
+			return fmt.Errorf("watch is empty") // will cause a CtxError+retry
+		}
+		if len(ch) == 0 { // send event only if one isn't pending
+			ch <- nil // event
+		}
+		return nil
+	}
+	_, _ = obj.AddWatcher(path, callback, true, false, etcd.WithPrefix()) // no need to check errors
+	return ch
+}
+
+// GetStr collects all of the strings which match a namespace in etcd.
+func GetStr(obj *EmbdEtcd, hostnameFilter []string, key string) (map[string]string, error) {
+	// old key structure is /$NS/strings/$hostname/$key = $data
+	// new key structure is /$NS/strings/$key/$hostname = $data
+	// FIXME: if we have the $key as the last token (old key structure), we
+	// can allow the key to contain the slash char, otherwise we need to
+	// verify that one isn't present in the input string.
+	path := fmt.Sprintf("/%s/strings/%s", NS, key)
+	keyMap, err := obj.Get(path, etcd.WithPrefix(), etcd.WithSort(etcd.SortByKey, etcd.SortAscend))
+	if err != nil {
+		return nil, errwrap.Wrapf(err, "could not get strings in: %s", key)
+	}
+	result := make(map[string]string)
+	for key, val := range keyMap {
+		if !strings.HasPrefix(key, path) { // sanity check
+			continue
+		}
+
+		str := strings.Split(key[len(path):], "/")
+		if len(str) != 2 {
+			return nil, fmt.Errorf("unexpected chunk count of %d", len(str))
+		}
+		_, hostname := str[0], str[1]
+
+		if hostname == "" {
+			return nil, fmt.Errorf("unexpected chunk length of %d", len(hostname))
+		}
+
+		// FIXME: ideally this would be a server side filter instead!
+		if len(hostnameFilter) > 0 && !util.StrInList(hostname, hostnameFilter) {
+			continue
+		}
+		//log.Printf("Etcd: GetStr(%s): (Hostname, Data): (%s, %s)", key, hostname, val)
+		result[hostname] = val
+	}
+	return result, nil
+}
+
+// SetStr sets a key and hostname pair to a certain value. If the value is nil,
+// then it deletes the key. Otherwise the value should point to a string.
+// TODO: TTL or delete disconnect?
+func SetStr(obj *EmbdEtcd, hostname, key string, data *string) error {
+	// key structure is /$NS/strings/$key/$hostname = $data
+	path := fmt.Sprintf("/%s/strings/%s/%s", NS, key, hostname)
+	ifs := []etcd.Cmp{} // list matching the desired state
+	ops := []etcd.Op{}  // list of ops in this transaction (then)
+	els := []etcd.Op{}  // list of ops in this transaction (else)
+	if data == nil {    // perform a delete
+		// TODO: use https://github.com/coreos/etcd/pull/7417 if merged
+		//ifs = append(ifs, etcd.KeyExists(path))
+		ifs = append(ifs, etcd.Compare(etcd.Version(path), ">", 0))
+		ops = append(ops, etcd.OpDelete(path))
+	} else {
+		data := *data                                                // get the real value
+		ifs = append(ifs, etcd.Compare(etcd.Value(path), "=", data)) // desired state
+		els = append(els, etcd.OpPut(path, data))
+	}
+
+	// it's important to do this in one transaction, and atomically, because
+	// this way, we only generate one watch event, and only when it's needed
+	_, err := obj.Txn(ifs, ops, els) // TODO: do we need to look at response?
+	return errwrap.Wrapf(err, "could not set strings in: %s", key)
+}

etcd/world.go

@@ -0,0 +1,64 @@
+// Mgmt
+// Copyright (C) 2013-2017+ James Shubin and the project contributors
+// Written by James Shubin <james@shubin.ca> and the project contributors
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package etcd
+
+import (
+	"github.com/purpleidea/mgmt/resources"
+)
+
+// World is an etcd backed implementation of the World interface.
+type World struct {
+	Hostname string // uuid for the consumer of these
+	EmbdEtcd *EmbdEtcd
+}
+
+// ResExport exports a list of resources under our hostname namespace.
+// Subsequent calls replace the previously set collection atomically.
+func (obj *World) ResExport(resourceList []resources.Res) error {
+	return SetResources(obj.EmbdEtcd, obj.Hostname, resourceList)
+}
+
+// ResCollect gets the collection of exported resources which match the filter.
+// It does this atomically so that a call always returns a complete collection.
+func (obj *World) ResCollect(hostnameFilter, kindFilter []string) ([]resources.Res, error) {
+	// XXX: should we be restricted to retrieving resources that were
+	// exported with a tag that allows or restricts our hostname? We could
+	// enforce that here if the underlying API supported it... Add this?
+	return GetResources(obj.EmbdEtcd, hostnameFilter, kindFilter)
+}
+
+// SetWatch returns a channel which spits out events on possible string changes.
+func (obj *World) StrWatch(namespace string) chan error {
+	return WatchStr(obj.EmbdEtcd, namespace)
+}
+
+// StrGet returns a map of hostnames to values in the given namespace.
+func (obj *World) StrGet(namespace string) (map[string]string, error) {
+	return GetStr(obj.EmbdEtcd, []string{}, namespace)
+}
+
+// StrSet sets the namespace value to a particular string under the identity of
+// its own hostname.
+func (obj *World) StrSet(namespace, value string) error {
+	return SetStr(obj.EmbdEtcd, obj.Hostname, namespace, &value)
+}
+
+// StrDel deletes the value in a particular namespace.
+func (obj *World) StrDel(namespace string) error {
+	return SetStr(obj.EmbdEtcd, obj.Hostname, namespace, nil)
+}

event.go

@@ -1,55 +0,0 @@
-// Mgmt
-// Copyright (C) 2013-2016+ James Shubin and the project contributors
-// Written by James Shubin <james@shubin.ca> and the project contributors
-//
-// This program is free software: you can redistribute it and/or modify
-// it under the terms of the GNU Affero General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-//
-// This program is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-// GNU Affero General Public License for more details.
-//
-// You should have received a copy of the GNU Affero General Public License
-// along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
-package main
-
-//go:generate stringer -type=eventName -output=eventname_stringer.go
-type eventName int
-
-const (
-	eventExit eventName = iota
-	eventStart
-	eventPause
-	eventPoke
-	eventBackPoke
-)
-
-type Event struct {
-	Name eventName
-	Resp chan bool // channel to send an ack response on, nil to skip
-	//Wg   *sync.WaitGroup // receiver barrier to Wait() for everyone else on
-	Msg      string // some words for fun
-	Activity bool   // did something interesting happen?
-}
-
-// send a single acknowledgement on the channel if one was requested
-func (event *Event) ACK() {
-	if event.Resp != nil { // if they've requested an ACK
-		event.Resp <- true // send ACK
-	}
-}
-
-func (event *Event) NACK() {
-	if event.Resp != nil { // if they've requested an ACK
-		event.Resp <- false // send NACK
-	}
-}
-
-// get the activity value
-func (event *Event) GetActivity() bool {
-	return event.Activity
-}

event/event.go

@@ -0,0 +1,119 @@
+// Mgmt
+// Copyright (C) 2013-2017+ James Shubin and the project contributors
+// Written by James Shubin <james@shubin.ca> and the project contributors
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+// Package event provides some primitives that are used for message passing.
+package event
+
+import (
+	"fmt"
+)
+
+//go:generate stringer -type=Kind -output=kind_stringer.go
+
+// Kind represents the type of event being passed.
+type Kind int
+
+// The different event kinds are used in different contexts.
+const (
+	EventNil Kind = iota
+	EventExit
+	EventStart
+	EventPause
+	EventPoke
+	EventBackPoke
+)
+
+// Resp is a channel to be used for boolean responses. A nil represents an ACK,
+// and a non-nil represents a NACK (false). This also lets us use custom errors.
+type Resp chan error
+
+// Event is the main struct that stores event information and responses.
+type Event struct {
+	Kind Kind
+	Resp Resp // channel to send an ack response on, nil to skip
+	//Wg   *sync.WaitGroup // receiver barrier to Wait() for everyone else on
+	Err error // store an error in our event
+}
+
+// ACK sends a single acknowledgement on the channel if one was requested.
+func (event *Event) ACK() {
+	if event.Resp != nil { // if they've requested an ACK
+		event.Resp.ACK()
+	}
+}
+
+// NACK sends a negative acknowledgement message on the channel if one was requested.
+func (event *Event) NACK() {
+	if event.Resp != nil { // if they've requested a NACK
+		event.Resp.NACK()
+	}
+}
+
+// ACKNACK sends a custom ACK or NACK message on the channel if one was requested.
+func (event *Event) ACKNACK(err error) {
+	if event.Resp != nil { // if they've requested a NACK
+		event.Resp.ACKNACK(err)
+	}
+}
+
+// NewResp is just a helper to return the right type of response channel.
+func NewResp() Resp {
+	resp := make(chan error)
+	return resp
+}
+
+// ACK sends a true value to resp.
+func (resp Resp) ACK() {
+	if resp != nil {
+		resp <- nil // TODO: close instead?
+	}
+}
+
+// NACK sends a false value to resp.
+func (resp Resp) NACK() {
+	if resp != nil {
+		resp <- fmt.Errorf("NACK")
+	}
+}
+
+// ACKNACK sends a custom ACK or NACK. The ACK value is always nil, the NACK can
+// be any non-nil error value.
+func (resp Resp) ACKNACK(err error) {
+	if resp != nil {
+		resp <- err
+	}
+}
+
+// Wait waits for any response from a Resp channel and returns it.
+func (resp Resp) Wait() error {
+	return <-resp
+}
+
+// ACKWait waits for a +ive Ack from a Resp channel.
+func (resp Resp) ACKWait() {
+	for {
+		// wait until true value
+		if resp.Wait() == nil {
+			return
+		}
+	}
+}
+
+// Error returns the stored error value.
+func (event *Event) Error() error {
+	return event.Err
+}

examples/augeas1.yaml

@@ -0,0 +1,11 @@
+---
+graph: mygraph
+resources:
+  augeas:
+  - name: sshd_config
+    lens: Sshd.lns
+    file: "/etc/ssh/sshd_config"
+    sets:
+    - path: X11Forwarding
+      value: false
+edges:

examples/autoedges1.yaml

@@ -0,0 +1,19 @@
+---
+graph: mygraph
+resources:
+  file:
+  - name: file1
+    meta:
+      autoedge: true
+    path: "/tmp/foo/bar/f1"
+    content: |
+      i am f1
+    state: exists
+  - name: file2
+    meta:
+      autoedge: true
+    path: "/tmp/foo/"
+    content: |
+      i am f2
+    state: exists
+edges: []

examples/autoedges2.yaml

@@ -0,0 +1,24 @@
+---
+graph: mygraph
+resources:
+  file:
+  - name: file1
+    meta:
+      autoedge: true
+    path: "/etc/drbd.conf"
+    content: |
+      # this is an mgmt test
+    state: exists
+  - name: file2
+    meta:
+      autoedge: true
+    path: "/tmp/foo/"
+    content: |
+      i am f2
+    state: exists
+  pkg:
+  - name: drbd-utils
+    meta:
+      autoedge: true
+    state: installed
+edges: []

examples/autoedges3.yaml

@@ -0,0 +1,32 @@
+---
+graph: mygraph
+resources:
+  pkg:
+  - name: drbd-utils
+    meta:
+      autoedge: true
+      noop: true
+    state: installed
+  file:
+  - name: file1
+    meta:
+      autoedge: true
+      noop: true
+    path: "/etc/drbd.conf"
+    content: |
+      # this is an mgmt test
+    state: exists
+  - name: file2
+    meta:
+      autoedge: true
+      noop: true
+    path: "/etc/drbd.d/"
+    source: /dev/null
+    state: exists
+  svc:
+  - name: drbd
+    meta:
+      autoedge: true
+      noop: true
+    state: stopped
+edges: []

examples/autogroup1.yaml

@@ -0,0 +1,21 @@
+---
+graph: mygraph
+resources:
+  pkg:
+  - name: drbd-utils
+    meta:
+      autogroup: false
+    state: installed
+  - name: powertop
+    meta:
+      autogroup: true
+    state: installed
+  - name: sl
+    meta:
+      autogroup: true
+    state: installed
+  - name: cowsay
+    meta:
+      autogroup: true
+    state: installed
+edges: []

examples/autogroup2.yaml

@@ -0,0 +1,17 @@
+---
+graph: mygraph
+resources:
+  pkg:
+  - name: powertop
+    meta:
+      autogroup: true
+    state: installed
+  - name: sl
+    meta:
+      autogroup: true
+    state: installed
+  - name: cowsay
+    meta:
+      autogroup: true
+    state: installed
+edges: []

examples/deep-dirs.yaml

@@ -0,0 +1,9 @@
+---
+graph: mygraph
+resources:
+  file:
+  - name: file1
+    path: "/tmp/mgmt/a/b/c/f1"
+    content: |
+      i am f1
+    state: exists

examples/etcd1a.yaml

@@ -0,0 +1,13 @@
+---
+graph: mygraph
+resources:
+  file:
+  - name: "@@filea"
+    path: "/tmp/mgmtA/fA"
+    content: |
+      i am fA, exported from host A
+    state: exists
+collect:
+- kind: file
+  pattern: "/tmp/mgmtA/"
+edges: []

examples/etcd1b.yaml

@@ -0,0 +1,13 @@
+---
+graph: mygraph
+resources:
+  file:
+  - name: "@@fileb"
+    path: "/tmp/mgmtB/fB"
+    content: |
+      i am fB, exported from host B
+    state: exists
+collect:
+- kind: file
+  pattern: "/tmp/mgmtB/"
+edges: []

examples/etcd1c.yaml

@@ -0,0 +1,13 @@
+---
+graph: mygraph
+resources:
+  file:
+  - name: "@@filec"
+    path: "/tmp/mgmtC/fC"
+    content: |
+      i am fC, exported from host C
+    state: exists
+collect:
+- kind: file
+  pattern: "/tmp/mgmtC/"
+edges: []

examples/etcd1d.yaml

@@ -0,0 +1,13 @@
+---
+graph: mygraph
+resources:
+  file:
+  - name: "@@filed"
+    path: "/tmp/mgmtD/fD"
+    content: |
+      i am fD, exported from host D
+    state: exists
+collect:
+- kind: file
+  pattern: "/tmp/mgmtD/"
+edges: []

examples/etcd1e.yaml

@@ -0,0 +1,13 @@
+---
+graph: mygraph
+resources:
+  file:
+  - name: "@@filee"
+    path: "/tmp/mgmtE/fE"
+    content: |
+      i am fE, exported from host E
+    state: exists
+collect:
+- kind: file
+  pattern: "/tmp/mgmtE/"
+edges: []

examples/exec1.yaml

@@ -1,6 +1,6 @@
 ---
 graph: mygraph
-types:
+resources:
   exec:
   - name: exec1
     cmd: sleep 10s
@@ -45,15 +45,15 @@ types:
 edges:
 - name: e1
   from:
-    type: exec
+    kind: exec
     name: exec1
   to:
-    type: exec
+    kind: exec
     name: exec2
 - name: e2
   from:
-    type: exec
+    kind: exec
     name: exec2
   to:
-    type: exec
+    kind: exec
     name: exec3

examples/exec1a.yaml

@@ -1,6 +1,6 @@
 ---
 graph: mygraph
-types:
+resources:
   exec:
   - name: exec1
     cmd: sleep 10s
@@ -25,8 +25,8 @@ types:
 edges:
 - name: e1
   from:
-    type: exec
+    kind: exec
     name: exec1
   to:
-    type: exec
+    kind: exec
     name: exec2

examples/exec1b.yaml

@@ -1,6 +1,6 @@
 ---
 graph: mygraph
-types:
+resources:
   exec:
   - name: exec1
     cmd: sleep 10s
@@ -25,8 +25,8 @@ types:
 edges:
 - name: e1
   from:
-    type: exec
+    kind: exec
     name: exec1
   to:
-    type: exec
+    kind: exec
     name: exec2

examples/exec1c.yaml

@@ -1,6 +1,6 @@
 ---
 graph: mygraph
-types:
+resources:
   exec:
   - name: exec1
     cmd: echo hello from exec1
@@ -25,8 +25,8 @@ types:
 edges:
 - name: e1
   from:
-    type: exec
+    kind: exec
     name: exec1
   to:
-    type: exec
+    kind: exec
     name: exec2

examples/exec1d.yaml

@@ -1,6 +1,6 @@
 ---
 graph: mygraph
-types:
+resources:
   exec:
   - name: exec1
     cmd: echo hello from exec1

examples/exec2.yaml

@@ -0,0 +1,83 @@
+---
+graph: mygraph
+resources:
+  exec:
+  - name: exec1
+    cmd: sleep 10s
+    shell: ''
+    timeout: 0
+    watchcmd: ''
+    watchshell: ''
+    ifcmd: ''
+    ifshell: ''
+    pollint: 0
+    state: present
+  - name: exec2
+    cmd: sleep 10s
+    shell: ''
+    timeout: 0
+    watchcmd: ''
+    watchshell: ''
+    ifcmd: ''
+    ifshell: ''
+    pollint: 0
+    state: present
+  - name: exec3
+    cmd: sleep 10s
+    shell: ''
+    timeout: 0
+    watchcmd: ''
+    watchshell: ''
+    ifcmd: ''
+    ifshell: ''
+    pollint: 0
+    state: present
+  - name: exec4
+    cmd: sleep 10s
+    shell: ''
+    timeout: 0
+    watchcmd: ''
+    watchshell: ''
+    ifcmd: ''
+    ifshell: ''
+    pollint: 0
+    state: present
+  - name: exec5
+    cmd: sleep 15s
+    shell: ''
+    timeout: 0
+    watchcmd: ''
+    watchshell: ''
+    ifcmd: ''
+    ifshell: ''
+    pollint: 0
+    state: present
+edges:
+- name: e1
+  from:
+    kind: exec
+    name: exec1
+  to:
+    kind: exec
+    name: exec2
+- name: e2
+  from:
+    kind: exec
+    name: exec1
+  to:
+    kind: exec
+    name: exec3
+- name: e3
+  from:
+    kind: exec
+    name: exec2
+  to:
+    kind: exec
+    name: exec4
+- name: e4
+  from:
+    kind: exec
+    name: exec3
+  to:
+    kind: exec
+    name: exec4

examples/exec3-sema.yaml

@@ -0,0 +1,67 @@
+---
+graph: parallel
+resources:
+  exec:
+  - name: pkg10
+    meta:
+      sema: ['mylock:1', 'otherlock:42']
+    cmd: sleep 10s
+    shell: ''
+    timeout: 0
+    watchcmd: ''
+    watchshell: ''
+    ifcmd: ''
+    ifshell: ''
+    pollint: 0
+    state: present
+  - name: svc10
+    meta:
+      sema: ['mylock:1']
+    cmd: sleep 10s
+    shell: ''
+    timeout: 0
+    watchcmd: ''
+    watchshell: ''
+    ifcmd: ''
+    ifshell: ''
+    pollint: 0
+    state: present
+  - name: exec10
+    meta:
+      sema: ['mylock:1']
+    cmd: sleep 10s
+    shell: ''
+    timeout: 0
+    watchcmd: ''
+    watchshell: ''
+    ifcmd: ''
+    ifshell: ''
+    pollint: 0
+    state: present
+  - name: pkg15
+    meta:
+      sema: ['mylock:1', 'otherlock:42']
+    cmd: sleep 15s
+    shell: ''
+    timeout: 0
+    watchcmd: ''
+    watchshell: ''
+    ifcmd: ''
+    ifshell: ''
+    pollint: 0
+    state: present
+edges:
+- name: e1
+  from:
+    kind: exec
+    name: pkg10
+  to:
+    kind: exec
+    name: svc10
+- name: e2
+  from:
+    kind: exec
+    name: svc10
+  to:
+    kind: exec
+    name: exec10

examples/exec3.yaml

@@ -0,0 +1,59 @@
+---
+graph: parallel
+resources:
+  exec:
+  - name: pkg10
+    cmd: sleep 10s
+    shell: ''
+    timeout: 0
+    watchcmd: ''
+    watchshell: ''
+    ifcmd: ''
+    ifshell: ''
+    pollint: 0
+    state: present
+  - name: svc10
+    cmd: sleep 10s
+    shell: ''
+    timeout: 0
+    watchcmd: ''
+    watchshell: ''
+    ifcmd: ''
+    ifshell: ''
+    pollint: 0
+    state: present
+  - name: exec10
+    cmd: sleep 10s
+    shell: ''
+    timeout: 0
+    watchcmd: ''
+    watchshell: ''
+    ifcmd: ''
+    ifshell: ''
+    pollint: 0
+    state: present
+  - name: pkg15
+    cmd: sleep 15s
+    shell: ''
+    timeout: 0
+    watchcmd: ''
+    watchshell: ''
+    ifcmd: ''
+    ifshell: ''
+    pollint: 0
+    state: present
+edges:
+- name: e1
+  from:
+    kind: exec
+    name: pkg10
+  to:
+    kind: exec
+    name: svc10
+- name: e2
+  from:
+    kind: exec
+    name: svc10
+  to:
+    kind: exec
+    name: exec10

examples/file1.yaml

@@ -1,6 +1,6 @@
 ---
 graph: mygraph
-types:
+resources:
   noop:
   - name: noop1
   file:
@@ -27,15 +27,15 @@ types:
 edges:
 - name: e1
   from:
-    type: file
+    kind: file
     name: file1
   to:
-    type: file
+    kind: file
     name: file2
 - name: e2
   from:
-    type: file
+    kind: file
     name: file2
   to:
-    type: file
+    kind: file
     name: file3

examples/file2.yaml

@@ -0,0 +1,13 @@
+---
+graph: mygraph
+resources:
+  noop:
+  - name: noop1
+  file:
+  - name: file1
+    path: "/tmp/mgmt/hello/"
+    source: "/var/lib/mgmt/files/some_dir/"
+    recurse: true
+    force: true
+    state: exists
+edges: []

examples/file3.yaml

@@ -0,0 +1,13 @@
+---
+graph: mygraph
+resources:
+  file:
+  - name: file1
+    meta:
+      limit: .inf
+      burst: 0
+    path: "/tmp/mgmt/hello"
+    content: |
+      i am a file
+    state: exists
+edges: []

examples/graph0.yaml

@@ -1,7 +1,7 @@
 ---
 graph: mygraph
 comment: hello world example
-types:
+resources:
   noop:
   - name: noop1
   file:
@@ -13,8 +13,8 @@ types:
 edges:
 - name: e1
   from:
-    type: noop
+    kind: noop
     name: noop1
   to:
-    type: file
+    kind: file
     name: file1

examples/graph10.yaml

@@ -1,7 +1,7 @@
 ---
 graph: mygraph
 comment: simple exec fan in to fan out example to demonstrate optimization
-types:
+resources:
   exec:
   - name: exec1
     cmd: sleep 10s
@@ -86,43 +86,43 @@ types:
 edges:
 - name: e1
   from:
-    type: exec
+    kind: exec
     name: exec1
   to:
-    type: exec
+    kind: exec
     name: exec4
 - name: e2
   from:
-    type: exec
+    kind: exec
     name: exec2
   to:
-    type: exec
+    kind: exec
     name: exec4
 - name: e3
   from:
-    type: exec
+    kind: exec
     name: exec3
   to:
-    type: exec
+    kind: exec
     name: exec4
 - name: e4
   from:
-    type: exec
+    kind: exec
     name: exec4
   to:
-    type: exec
+    kind: exec
     name: exec5
 - name: e5
   from:
-    type: exec
+    kind: exec
     name: exec4
   to:
-    type: exec
+    kind: exec
     name: exec6
 - name: e6
   from:
-    type: exec
+    kind: exec
     name: exec4
   to:
-    type: exec
+    kind: exec
     name: exec7

examples/graph1a.yaml

@@ -1,6 +1,6 @@
 ---
 graph: mygraph
-types:
+resources:
   file:
   - name: file1
     path: "/tmp/mgmt/f1"
@@ -15,8 +15,8 @@ types:
 edges:
 - name: e1
   from:
-    type: file
+    kind: file
     name: file1
   to:
-    type: file
+    kind: file
     name: file2

examples/graph1b.yaml

@@ -1,6 +1,6 @@
 ---
 graph: mygraph
-types:
+resources:
   file:
   - name: file2
     path: "/tmp/mgmt/f2"
@@ -15,8 +15,8 @@ types:
 edges:
 - name: e2
   from:
-    type: file
+    kind: file
     name: file2
   to:
-    type: file
+    kind: file
     name: file3

examples/graph3a.yaml

@@ -1,6 +1,6 @@
 ---
 graph: mygraph
-types:
+resources:
   file:
   - name: file1a
     path: "/tmp/mgmtA/f1a"
@@ -23,6 +23,6 @@ types:
       i am f4, exported from host A
     state: exists
 collect:
-- type: file
+- kind: file
   pattern: "/tmp/mgmtA/"
 edges: []

examples/graph3b.yaml

@@ -1,6 +1,6 @@
 ---
 graph: mygraph
-types:
+resources:
   file:
   - name: file1b
     path: "/tmp/mgmtB/f1b"
@@ -23,6 +23,6 @@ types:
       i am f4, exported from host B
     state: exists
 collect:
-- type: file
+- kind: file
   pattern: "/tmp/mgmtB/"
 edges: []

examples/graph3c.yaml

@@ -1,6 +1,6 @@
 ---
 graph: mygraph
-types:
+resources:
   file:
   - name: file1c
     path: "/tmp/mgmtC/f1c"
@@ -23,6 +23,6 @@ types:
       i am f4, exported from host C
     state: exists
 collect:
-- type: file
+- kind: file
   pattern: "/tmp/mgmtC/"
 edges: []

examples/graph4.yaml

@@ -1,6 +1,6 @@
 ---
 graph: mygraph
-types:
+resources:
   file:
   - name: file1
     path: "/tmp/mgmt/f1"
@@ -13,6 +13,6 @@ types:
       i am f3, exported from host A
     state: exists
 collect:
-- type: file
+- kind: file
   pattern: ''
 edges:

examples/graph5.yaml

@@ -1,6 +1,6 @@
 ---
 graph: mygraph
-types:
+resources:
   file:
   - name: file1
     path: "/tmp/mgmt/f1"
@@ -8,6 +8,6 @@ types:
       i am f1
     state: exists
 collect:
-- type: file
+- kind: file
   pattern: ''
 edges:

examples/graph6.yaml

@@ -1,6 +1,6 @@
 ---
 graph: mygraph
-types:
+resources:
   noop:
   - name: noop1
 edges:

examples/graph7.yaml

@@ -1,6 +1,6 @@
 ---
 graph: mygraph
-types:
+resources:
   noop:
   - name: noop1
   exec:

examples/graph9.yaml

@@ -1,7 +1,7 @@
 ---
 graph: mygraph
 comment: simple exec fan in example to demonstrate optimization
-types:
+resources:
   exec:
   - name: exec1
     cmd: sleep 10s
@@ -56,22 +56,22 @@ types:
 edges:
 - name: e1
   from:
-    type: exec
+    kind: exec
     name: exec1
   to:
-    type: exec
+    kind: exec
     name: exec5
 - name: e2
   from:
-    type: exec
+    kind: exec
     name: exec2
   to:
-    type: exec
+    kind: exec
     name: exec5
 - name: e3
   from:
-    type: exec
+    kind: exec
     name: exec3
   to:
-    type: exec
+    kind: exec
     name: exec5

examples/hostname.yaml

@@ -0,0 +1,7 @@
+---
+graph: mygraph
+resources:
+  hostname:
+    - name: Hostname Watcher @ TestHost
+      hostname: test.hostname.example.com
+edges: []

examples/kv1.yaml

@@ -0,0 +1,8 @@
+---
+graph: mygraph
+resources:
+  kv:
+  - name: kv1
+    key: "hello"
+    value: "world"
+edges: []

examples/kv2.yaml

@@ -0,0 +1,7 @@
+---
+graph: mygraph
+resources:
+  kv:
+  - name: kv1
+    key: "iamdeleted"
+edges: []

examples/kv3.yaml

@@ -0,0 +1,9 @@
+---
+graph: mygraph
+resources:
+  kv:
+  - name: kv1
+    key: "stage"
+    value: "3"
+    skiplessthan: true
+edges: []

examples/kv4.yaml

@@ -0,0 +1,31 @@
+---
+graph: mygraph
+resources:
+  kv:
+  - name: kv1
+    key: "stage"
+    value: "1"
+    skiplessthan: true
+  - name: kv2
+    key: "stage"
+    value: "2"
+    skiplessthan: true
+  - name: kv3
+    key: "stage"
+    value: "3"
+    skiplessthan: true
+edges:
+- name: e1
+  from:
+    kind: kv
+    name: kv1
+  to:
+    kind: kv
+    name: kv2
+- name: e2
+  from:
+    kind: kv
+    name: kv2
+  to:
+    kind: kv
+    name: kv3

examples/lib/libmgmt1.go

@@ -0,0 +1,192 @@
+// libmgmt example
+package main
+
+import (
+	"fmt"
+	"log"
+	"os"
+	"os/signal"
+	"sync"
+	"syscall"
+	"time"
+
+	"github.com/purpleidea/mgmt/gapi"
+	mgmt "github.com/purpleidea/mgmt/lib"
+	"github.com/purpleidea/mgmt/pgraph"
+	"github.com/purpleidea/mgmt/resources"
+	"github.com/purpleidea/mgmt/yamlgraph"
+)
+
+// MyGAPI implements the main GAPI interface.
+type MyGAPI struct {
+	Name     string // graph name
+	Interval uint   // refresh interval, 0 to never refresh
+
+	data        gapi.Data
+	initialized bool
+	closeChan   chan struct{}
+	wg          sync.WaitGroup // sync group for tunnel go routines
+}
+
+// NewMyGAPI creates a new MyGAPI struct and calls Init().
+func NewMyGAPI(data gapi.Data, name string, interval uint) (*MyGAPI, error) {
+	obj := &MyGAPI{
+		Name:     name,
+		Interval: interval,
+	}
+	return obj, obj.Init(data)
+}
+
+// Init initializes the MyGAPI struct.
+func (obj *MyGAPI) Init(data gapi.Data) error {
+	if obj.initialized {
+		return fmt.Errorf("already initialized")
+	}
+	if obj.Name == "" {
+		return fmt.Errorf("the graph name must be specified")
+	}
+	obj.data = data // store for later
+	obj.closeChan = make(chan struct{})
+	obj.initialized = true
+	return nil
+}
+
+// Graph returns a current Graph.
+func (obj *MyGAPI) Graph() (*pgraph.Graph, error) {
+	if !obj.initialized {
+		return nil, fmt.Errorf("libmgmt: MyGAPI is not initialized")
+	}
+
+	n1, err := resources.NewNoopRes("noop1")
+	if err != nil {
+		return nil, fmt.Errorf("can't create resource: %v", err)
+	}
+
+	// we can still build a graph via the yaml method
+	gc := &yamlgraph.GraphConfig{
+		Graph: obj.Name,
+		Resources: yamlgraph.Resources{ // must redefine anonymous struct :(
+			// in alphabetical order
+			Exec:  []*resources.ExecRes{},
+			File:  []*resources.FileRes{},
+			Msg:   []*resources.MsgRes{},
+			Noop:  []*resources.NoopRes{n1},
+			Pkg:   []*resources.PkgRes{},
+			Svc:   []*resources.SvcRes{},
+			Timer: []*resources.TimerRes{},
+			Virt:  []*resources.VirtRes{},
+		},
+		//Collector: []collectorResConfig{},
+		//Edges:     []Edge{},
+		Comment: "comment!",
+	}
+
+	g, err := gc.NewGraphFromConfig(obj.data.Hostname, obj.data.World, obj.data.Noop)
+	return g, err
+}
+
+// Next returns nil errors every time there could be a new graph.
+func (obj *MyGAPI) Next() chan error {
+	if obj.data.NoWatch || obj.Interval <= 0 {
+		return nil
+	}
+	ch := make(chan error)
+	obj.wg.Add(1)
+	go func() {
+		defer obj.wg.Done()
+		defer close(ch) // this will run before the obj.wg.Done()
+		if !obj.initialized {
+			ch <- fmt.Errorf("libmgmt: MyGAPI is not initialized")
+			return
+		}
+
+		// arbitrarily change graph every interval seconds
+		ticker := time.NewTicker(time.Duration(obj.Interval) * time.Second)
+		defer ticker.Stop()
+		for {
+			select {
+			case <-ticker.C:
+				log.Printf("libmgmt: Generating new graph...")
+				select {
+				case ch <- nil: // trigger a run
+				case <-obj.closeChan:
+					return
+				}
+			case <-obj.closeChan:
+				return
+			}
+		}
+	}()
+	return ch
+}
+
+// Close shuts down the MyGAPI.
+func (obj *MyGAPI) Close() error {
+	if !obj.initialized {
+		return fmt.Errorf("libmgmt: MyGAPI is not initialized")
+	}
+	close(obj.closeChan)
+	obj.wg.Wait()
+	obj.initialized = false // closed = true
+	return nil
+}
+
+// Run runs an embedded mgmt server.
+func Run() error {
+
+	obj := &mgmt.Main{}
+	obj.Program = "libmgmt" // TODO: set on compilation
+	obj.Version = "0.0.1"   // TODO: set on compilation
+	obj.TmpPrefix = true
+	obj.IdealClusterSize = -1
+	obj.ConvergedTimeout = -1
+	obj.Noop = true
+
+	obj.GAPI = &MyGAPI{ // graph API
+		Name:     "libmgmt", // TODO: set on compilation
+		Interval: 15,        // arbitrarily change graph every 15 seconds
+	}
+
+	if err := obj.Init(); err != nil {
+		return err
+	}
+
+	// install the exit signal handler
+	exit := make(chan struct{})
+	defer close(exit)
+	go func() {
+		signals := make(chan os.Signal, 1)
+		signal.Notify(signals, os.Interrupt) // catch ^C
+		//signal.Notify(signals, os.Kill) // catch signals
+		signal.Notify(signals, syscall.SIGTERM)
+
+		select {
+		case sig := <-signals: // any signal will do
+			if sig == os.Interrupt {
+				log.Println("Interrupted by ^C")
+				obj.Exit(nil)
+				return
+			}
+			log.Println("Interrupted by signal")
+			obj.Exit(fmt.Errorf("killed by %v", sig))
+			return
+		case <-exit:
+			return
+		}
+	}()
+
+	if err := obj.Run(); err != nil {
+		return err
+	}
+	return nil
+}
+
+func main() {
+	log.Printf("Hello!")
+	if err := Run(); err != nil {
+		fmt.Println(err)
+		os.Exit(1)
+		return
+	}
+	log.Printf("Goodbye!")
+}

examples/lib/libmgmt2.go

@@ -0,0 +1,192 @@
+// libmgmt example
+package main
+
+import (
+	"fmt"
+	"log"
+	"os"
+	"os/signal"
+	"strconv"
+	"sync"
+	"syscall"
+	"time"
+
+	"github.com/purpleidea/mgmt/gapi"
+	mgmt "github.com/purpleidea/mgmt/lib"
+	"github.com/purpleidea/mgmt/pgraph"
+	"github.com/purpleidea/mgmt/resources"
+)
+
+// MyGAPI implements the main GAPI interface.
+type MyGAPI struct {
+	Name     string // graph name
+	Count    uint   // number of resources to create
+	Interval uint   // refresh interval, 0 to never refresh
+
+	data        gapi.Data
+	initialized bool
+	closeChan   chan struct{}
+	wg          sync.WaitGroup // sync group for tunnel go routines
+}
+
+// NewMyGAPI creates a new MyGAPI struct and calls Init().
+func NewMyGAPI(data gapi.Data, name string, interval uint, count uint) (*MyGAPI, error) {
+	obj := &MyGAPI{
+		Name:     name,
+		Count:    count,
+		Interval: interval,
+	}
+	return obj, obj.Init(data)
+}
+
+// Init initializes the MyGAPI struct.
+func (obj *MyGAPI) Init(data gapi.Data) error {
+	if obj.initialized {
+		return fmt.Errorf("already initialized")
+	}
+	if obj.Name == "" {
+		return fmt.Errorf("the graph name must be specified")
+	}
+	obj.data = data // store for later
+	obj.closeChan = make(chan struct{})
+	obj.initialized = true
+	return nil
+}
+
+// Graph returns a current Graph.
+func (obj *MyGAPI) Graph() (*pgraph.Graph, error) {
+	if !obj.initialized {
+		return nil, fmt.Errorf("libmgmt: MyGAPI is not initialized")
+	}
+
+	g := pgraph.NewGraph(obj.Name)
+	var vertex *pgraph.Vertex
+	for i := uint(0); i < obj.Count; i++ {
+		n, err := resources.NewNoopRes(fmt.Sprintf("noop%d", i))
+		if err != nil {
+			return nil, fmt.Errorf("can't create resource: %v", err)
+		}
+		v := pgraph.NewVertex(n)
+		g.AddVertex(v)
+		if i > 0 {
+			g.AddEdge(vertex, v, pgraph.NewEdge(fmt.Sprintf("e%d", i)))
+		}
+		vertex = v // save
+	}
+
+	//g, err := config.NewGraphFromConfig(obj.data.Hostname, obj.data.World, obj.data.Noop)
+	return g, nil
+}
+
+// Next returns nil errors every time there could be a new graph.
+func (obj *MyGAPI) Next() chan error {
+	if obj.data.NoWatch || obj.Interval <= 0 {
+		return nil
+	}
+	ch := make(chan error)
+	obj.wg.Add(1)
+	go func() {
+		defer obj.wg.Done()
+		defer close(ch) // this will run before the obj.wg.Done()
+		if !obj.initialized {
+			ch <- fmt.Errorf("libmgmt: MyGAPI is not initialized")
+			return
+		}
+
+		// arbitrarily change graph every interval seconds
+		ticker := time.NewTicker(time.Duration(obj.Interval) * time.Second)
+		defer ticker.Stop()
+		for {
+			select {
+			case <-ticker.C:
+				log.Printf("libmgmt: Generating new graph...")
+				select {
+				case ch <- nil: // trigger a run
+				case <-obj.closeChan:
+					return
+				}
+			case <-obj.closeChan:
+				return
+			}
+		}
+	}()
+	return ch
+}
+
+// Close shuts down the MyGAPI.
+func (obj *MyGAPI) Close() error {
+	if !obj.initialized {
+		return fmt.Errorf("libmgmt: MyGAPI is not initialized")
+	}
+	close(obj.closeChan)
+	obj.wg.Wait()
+	obj.initialized = false // closed = true
+	return nil
+}
+
+// Run runs an embedded mgmt server.
+func Run(count uint) error {
+
+	obj := &mgmt.Main{}
+	obj.Program = "libmgmt" // TODO: set on compilation
+	obj.Version = "0.0.1"   // TODO: set on compilation
+	obj.TmpPrefix = true
+	obj.IdealClusterSize = -1
+	obj.ConvergedTimeout = -1
+	obj.Noop = true
+
+	obj.GAPI = &MyGAPI{ // graph API
+		Name:     "libmgmt", // TODO: set on compilation
+		Count:    count,     // number of vertices to add
+		Interval: 15,        // arbitrarily change graph every 15 seconds
+	}
+
+	if err := obj.Init(); err != nil {
+		return err
+	}
+
+	// install the exit signal handler
+	exit := make(chan struct{})
+	defer close(exit)
+	go func() {
+		signals := make(chan os.Signal, 1)
+		signal.Notify(signals, os.Interrupt) // catch ^C
+		//signal.Notify(signals, os.Kill) // catch signals
+		signal.Notify(signals, syscall.SIGTERM)
+
+		select {
+		case sig := <-signals: // any signal will do
+			if sig == os.Interrupt {
+				log.Println("Interrupted by ^C")
+				obj.Exit(nil)
+				return
+			}
+			log.Println("Interrupted by signal")
+			obj.Exit(fmt.Errorf("killed by %v", sig))
+			return
+		case <-exit:
+			return
+		}
+	}()
+
+	if err := obj.Run(); err != nil {
+		return err
+	}
+	return nil
+}
+
+func main() {
+	log.Printf("Hello!")
+	var count uint = 1 // default
+	if len(os.Args) == 2 {
+		if i, err := strconv.Atoi(os.Args[1]); err == nil && i > 0 {
+			count = uint(i)
+		}
+	}
+	if err := Run(count); err != nil {
+		fmt.Println(err)
+		os.Exit(1)
+		return
+	}
+	log.Printf("Goodbye!")
+}

examples/lib/libmgmt3.go

@@ -0,0 +1,241 @@
+// libmgmt example of send->recv
+package main
+
+import (
+	"fmt"
+	"log"
+	"os"
+	"os/signal"
+	"sync"
+	"syscall"
+	"time"
+
+	"github.com/purpleidea/mgmt/gapi"
+	mgmt "github.com/purpleidea/mgmt/lib"
+	"github.com/purpleidea/mgmt/pgraph"
+	"github.com/purpleidea/mgmt/resources"
+
+	"golang.org/x/time/rate"
+)
+
+// MyGAPI implements the main GAPI interface.
+type MyGAPI struct {
+	Name     string // graph name
+	Interval uint   // refresh interval, 0 to never refresh
+
+	data        gapi.Data
+	initialized bool
+	closeChan   chan struct{}
+	wg          sync.WaitGroup // sync group for tunnel go routines
+}
+
+// NewMyGAPI creates a new MyGAPI struct and calls Init().
+func NewMyGAPI(data gapi.Data, name string, interval uint) (*MyGAPI, error) {
+	obj := &MyGAPI{
+		Name:     name,
+		Interval: interval,
+	}
+	return obj, obj.Init(data)
+}
+
+// Init initializes the MyGAPI struct.
+func (obj *MyGAPI) Init(data gapi.Data) error {
+	if obj.initialized {
+		return fmt.Errorf("already initialized")
+	}
+	if obj.Name == "" {
+		return fmt.Errorf("the graph name must be specified")
+	}
+	obj.data = data // store for later
+	obj.closeChan = make(chan struct{})
+	obj.initialized = true
+	return nil
+}
+
+// Graph returns a current Graph.
+func (obj *MyGAPI) Graph() (*pgraph.Graph, error) {
+	if !obj.initialized {
+		return nil, fmt.Errorf("libmgmt: MyGAPI is not initialized")
+	}
+
+	g := pgraph.NewGraph(obj.Name)
+
+	// FIXME: these are being specified temporarily until it's the default!
+	metaparams := resources.MetaParams{
+		Limit: rate.Inf,
+		Burst: 0,
+	}
+
+	content := "Delete me to trigger a notification!\n"
+	f0 := &resources.FileRes{
+		BaseRes: resources.BaseRes{
+			Name:       "README",
+			MetaParams: metaparams,
+		},
+		Path:    "/tmp/mgmt/README",
+		Content: &content,
+		State:   "present",
+	}
+
+	v0 := pgraph.NewVertex(f0)
+	g.AddVertex(v0)
+
+	p1 := &resources.PasswordRes{
+		BaseRes: resources.BaseRes{
+			Name:       "password1",
+			MetaParams: metaparams,
+		},
+		Length: 8,    // generated string will have this many characters
+		Saved:  true, // this causes passwords to be stored in plain text!
+	}
+	v1 := pgraph.NewVertex(p1)
+	g.AddVertex(v1)
+
+	f1 := &resources.FileRes{
+		BaseRes: resources.BaseRes{
+			Name:       "file1",
+			MetaParams: metaparams,
+			// send->recv!
+			Recv: map[string]*resources.Send{
+				"Content": {Res: p1, Key: "Password"},
+			},
+		},
+		Path: "/tmp/mgmt/secret",
+		//Content:  p1.Password, // won't work
+		State: "present",
+	}
+
+	v2 := pgraph.NewVertex(f1)
+	g.AddVertex(v2)
+
+	n1 := &resources.NoopRes{
+		BaseRes: resources.BaseRes{
+			Name:       "noop1",
+			MetaParams: metaparams,
+		},
+	}
+
+	v3 := pgraph.NewVertex(n1)
+	g.AddVertex(v3)
+
+	e0 := pgraph.NewEdge("e0")
+	e0.Notify = true // send a notification from v0 to v1
+	g.AddEdge(v0, v1, e0)
+
+	g.AddEdge(v1, v2, pgraph.NewEdge("e1"))
+
+	e2 := pgraph.NewEdge("e2")
+	e2.Notify = true // send a notification from v2 to v3
+	g.AddEdge(v2, v3, e2)
+
+	//g, err := config.NewGraphFromConfig(obj.data.Hostname, obj.data.World, obj.data.Noop)
+	return g, nil
+}
+
+// Next returns nil errors every time there could be a new graph.
+func (obj *MyGAPI) Next() chan error {
+	if obj.data.NoWatch || obj.Interval <= 0 {
+		return nil
+	}
+	ch := make(chan error)
+	obj.wg.Add(1)
+	go func() {
+		defer obj.wg.Done()
+		defer close(ch) // this will run before the obj.wg.Done()
+		if !obj.initialized {
+			ch <- fmt.Errorf("libmgmt: MyGAPI is not initialized")
+			return
+		}
+
+		// arbitrarily change graph every interval seconds
+		ticker := time.NewTicker(time.Duration(obj.Interval) * time.Second)
+		defer ticker.Stop()
+		for {
+			select {
+			case <-ticker.C:
+				log.Printf("libmgmt: Generating new graph...")
+				select {
+				case ch <- nil: // trigger a run
+				case <-obj.closeChan:
+					return
+				}
+			case <-obj.closeChan:
+				return
+			}
+		}
+	}()
+	return ch
+}
+
+// Close shuts down the MyGAPI.
+func (obj *MyGAPI) Close() error {
+	if !obj.initialized {
+		return fmt.Errorf("libmgmt: MyGAPI is not initialized")
+	}
+	close(obj.closeChan)
+	obj.wg.Wait()
+	obj.initialized = false // closed = true
+	return nil
+}
+
+// Run runs an embedded mgmt server.
+func Run() error {
+
+	obj := &mgmt.Main{}
+	obj.Program = "libmgmt" // TODO: set on compilation
+	obj.Version = "0.0.1"   // TODO: set on compilation
+	obj.TmpPrefix = true    // disable for easy debugging
+	//prefix := "/tmp/testprefix/"
+	//obj.Prefix = &p // enable for easy debugging
+	obj.IdealClusterSize = -1
+	obj.ConvergedTimeout = -1
+	obj.Noop = false // FIXME: careful!
+
+	obj.GAPI = &MyGAPI{ // graph API
+		Name:     "libmgmt", // TODO: set on compilation
+		Interval: 60 * 10,   // arbitrarily change graph every 15 seconds
+	}
+
+	if err := obj.Init(); err != nil {
+		return err
+	}
+
+	// install the exit signal handler
+	exit := make(chan struct{})
+	defer close(exit)
+	go func() {
+		signals := make(chan os.Signal, 1)
+		signal.Notify(signals, os.Interrupt) // catch ^C
+		//signal.Notify(signals, os.Kill) // catch signals
+		signal.Notify(signals, syscall.SIGTERM)
+
+		select {
+		case sig := <-signals: // any signal will do
+			if sig == os.Interrupt {
+				log.Println("Interrupted by ^C")
+				obj.Exit(nil)
+				return
+			}
+			log.Println("Interrupted by signal")
+			obj.Exit(fmt.Errorf("killed by %v", sig))
+			return
+		case <-exit:
+			return
+		}
+	}()
+
+	if err := obj.Run(); err != nil {
+		return err
+	}
+	return nil
+}
+
+func main() {
+	log.Printf("Hello!")
+	if err := Run(); err != nil {
+		fmt.Println(err)
+		os.Exit(1)
+		return
+	}
+	log.Printf("Goodbye!")
+}

examples/limit1.yaml

@@ -0,0 +1,13 @@
+---
+graph: mygraph
+resources:
+  file:
+  - name: file1
+    meta:
+      limit: 0.2
+      burst: 5
+    path: "/tmp/mgmt/limit"
+    content: |
+      i am a normal file
+    state: exists
+edges: []

examples/msg1.yaml

@@ -0,0 +1,19 @@
+---
+graph: mygraph
+comment: timer example
+resources:
+  timer:
+  - name: timer1
+    interval: 30
+  msg:
+  - name: msg1
+    body: mgmt logged this message
+    journal: true
+edges:
+- name: e1
+  from:
+    kind: timer
+    name: timer1
+  to:
+    kind: msg
+    name: msg1

examples/noop1.yaml

@@ -0,0 +1,24 @@
+---
+graph: mygraph
+comment: noop example
+resources:
+  noop:
+  - name: noop1
+    meta:
+      noop: true
+  file:
+  - name: file1
+    path: "/tmp/mgmt-hello-noop"
+    content: |
+      hello world from @purpleidea
+    state: exists
+    meta:
+      noop: true
+edges:
+- name: e1
+  from:
+    kind: noop
+    name: noop1
+  to:
+    kind: file
+    name: file1

examples/noop2.yaml

@@ -0,0 +1,30 @@
+---
+graph: mygraph
+comment: dangerous noop example
+resources:
+  noop:
+  - name: noop1
+    meta:
+      noop: true
+  file:
+  - name: file1
+    path: "/tmp/mgmt/hello-noop"
+    content: |
+      hello world from @purpleidea
+    state: exists
+    meta:
+      noop: true
+  exec:
+  - name: exec1
+    meta:
+      noop: true
+    cmd: 'rm -rf /'
+    shell: '/bin/bash'
+    timeout: 0
+    watchcmd: ''
+    watchshell: ''
+    ifcmd: ''
+    ifshell: ''
+    pollint: 0
+    state: present
+edges: []

examples/nspawn1.yaml

@@ -0,0 +1,7 @@
+---
+graph: mygraph
+resources:
+  nspawn:
+  - name: mgmt-nspawn1
+    state: running
+edges: []

examples/nspawn2.yaml

@@ -0,0 +1,7 @@
+---
+graph: mygraph
+resources:
+  nspawn:
+  - name: mgmt-nspawn2
+    state: stopped
+edges: []

examples/pkg1.yaml

@@ -0,0 +1,7 @@
+---
+graph: mygraph
+resources:
+  pkg:
+  - name: powertop
+    state: installed
+edges: []