cli, tools, util, modules: Add a grow util and module

This builds in some functionality for growing the filesystem for new
machines. It also gets wrapped with an mcl module for ease of use.

tools/grow.go

@@ -0,0 +1,68 @@
+// Mgmt
+// Copyright (C) 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 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 General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+// Additional permission under GNU GPL version 3 section 7
+//
+// If you modify this program, or any covered work, by linking or combining it
+// with embedded mcl code and modules (and that the embedded mcl code and
+// modules which link with this program, contain a copy of their source code in
+// the authoritative form) containing parts covered by the terms of any other
+// license, the licensors of this program grant you additional permission to
+// convey the resulting work. Furthermore, the licensors of this program grant
+// the original author, James Shubin, additional permission to update this
+// additional permission if he deems it necessary to achieve the goals of this
+// additional permission.
+
+package tools
+
+import (
+	"context"
+
+	cliUtil "github.com/purpleidea/mgmt/cli/util"
+	growUtil "github.com/purpleidea/mgmt/util/grow"
+)
+
+// Grow is the standalone entry program for the grow tools component.
+type Grow struct {
+	*cliUtil.ToolsGrowArgs // embedded config
+	Config                 // embedded Config
+
+	// Program is the name of this program, usually set at compile time.
+	Program string
+
+	// Version is the version of this program, usually set at compile time.
+	Version string
+
+	// Debug represents if we're running in debug mode or not.
+	Debug bool
+
+	// Logf is a logger which should be used.
+	Logf func(format string, v ...interface{})
+}
+
+// Main runs everything for this tools item.
+func (obj *Grow) Main(ctx context.Context) error {
+
+	g := &growUtil.Grow{
+		Noop:  !obj.Exec,
+		Done:  obj.Done,
+		Debug: obj.Debug,
+		Logf:  obj.Logf,
+	}
+
+	return g.Run(ctx, obj.Mount)
+}

tools/tools.go

@@ -0,0 +1,48 @@
+// Mgmt
+// Copyright (C) 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 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 General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+// Additional permission under GNU GPL version 3 section 7
+//
+// If you modify this program, or any covered work, by linking or combining it
+// with embedded mcl code and modules (and that the embedded mcl code and
+// modules which link with this program, contain a copy of their source code in
+// the authoritative form) containing parts covered by the terms of any other
+// license, the licensors of this program grant you additional permission to
+// convey the resulting work. Furthermore, the licensors of this program grant
+// the original author, James Shubin, additional permission to update this
+// additional permission if he deems it necessary to achieve the goals of this
+// additional permission.
+
+// Package tools provides some simple standalone tools to help with things.
+package tools
+
+import (
+	"context"
+)
+
+// API is the simple interface we expect for any tools items.
+type API interface {
+	// Main runs everything for this tools item.
+	Main(context.Context) error
+}
+
+// Config is a struct of all the configuration values which are shared by all of
+// the tools utilities. By including this as a separate struct, it can be used
+// as part of the API if we want.
+type Config struct {
+	//Foo string `arg:"--foo,env:MGMT_TOOLS_FOO" help:"Foo..."` // TODO: foo
+}