lang: funcs: Added a function to detect Debian and RedHat like systems

lang/funcs/core/os/family_func.go

@@ -0,0 +1,63 @@
+// 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 coreos
+
+import (
+	"os"
+
+	"github.com/purpleidea/mgmt/lang/funcs/simple"
+	"github.com/purpleidea/mgmt/lang/types"
+)
+
+func init() {
+	// TODO: Create a family method that will return a giant struct.
+	simple.ModuleRegister(moduleName, "is_debian", &types.FuncValue{
+		T: types.NewType("func() bool"),
+		V: IsDebian,
+	})
+	simple.ModuleRegister(moduleName, "is_redhat", &types.FuncValue{
+		T: types.NewType("func() bool"),
+		V: IsRedHat,
+	})
+}
+
+// IsDebian detects if the os family is debian.
+// TODO: Detect OS changes.
+func IsDebian(input []types.Value) (types.Value, error) {
+	exists := true
+	_, err := os.Stat("/etc/debian_version")
+	if os.IsNotExist(err) {
+		exists = false
+	}
+	return &types.BoolValue{
+		V: exists,
+	}, nil
+}
+
+// IsRedHat detects if the os family is redhat.
+// TODO: Detect OS changes.
+func IsRedHat(input []types.Value) (types.Value, error) {
+	exists := true
+	_, err := os.Stat("/etc/redhat-release")
+	if os.IsNotExist(err) {
+		exists = false
+	}
+	return &types.BoolValue{
+		V: exists,
+	}, nil
+}