test, integration: Add an integration test framework

This adds an initial implementation of an integration test framework for
writing more complicated tests. In particular this also makes some small
additions to the mgmt core so that testing is easier.

lib/converged.go

@@ -0,0 +1,38 @@
+// Mgmt
+// Copyright (C) 2013-2018+ 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 <http://www.gnu.org/licenses/>.
+
+package lib
+
+import (
+	"fmt"
+	"os"
+)
+
+// appendConvergedStatus appends the converged status to a file.
+func appendConvergedStatus(filename string, status bool) error {
+	// create or append to the file, in write only mode
+	f, err := os.OpenFile(filename, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
+	if err != nil {
+		return err
+	}
+	// TODO: add a timestamp?
+	byt := []byte(fmt.Sprintf("%t\n", status))
+	if _, err := f.Write(byt); err != nil {
+		return err
+	}
+	return f.Close()
+}