Move finalizer in its own struct

Also distinguish when we run in a root target dir ("/") or when we want
to run the commands in a separate folder

pkg/installer/finalizer.go

@@ -0,0 +1,76 @@
+// Copyright © 2019 Ettore Di Giacinto <mudler@gentoo.org>
+//
+// 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 2 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 installer
+
+import (
+	"os/exec"
+
+	"github.com/ghodss/yaml"
+	box "github.com/mudler/luet/pkg/box"
+	. "github.com/mudler/luet/pkg/logger"
+
+	"github.com/pkg/errors"
+)
+
+type LuetFinalizer struct {
+	Install   []string `json:"install"`
+	Uninstall []string `json:"uninstall"` // TODO: Where to store?
+}
+
+func (f *LuetFinalizer) RunInstall(s *System) error {
+	for _, c := range f.Install {
+		if s.Target == "/" {
+
+			Info("finalizer on / :", "sh", "-c", c)
+			cmd := exec.Command("sh", "-c", c)
+			stdoutStderr, err := cmd.CombinedOutput()
+			if err != nil {
+				return errors.Wrap(err, "Failed running command: "+string(stdoutStderr))
+			}
+			Info(string(stdoutStderr))
+		} else {
+			b := box.NewBox("sh", []string{"-c", c}, s.Target, false, true, true)
+			err := b.Run()
+			if err != nil {
+				return errors.Wrap(err, "Failed running command ")
+			}
+		}
+	}
+	return nil
+}
+
+// TODO: We don't store uninstall finalizers ?!
+func (f *LuetFinalizer) RunUnInstall() error {
+	for _, c := range f.Uninstall {
+		Debug("finalizer:", "sh", "-c", c)
+		cmd := exec.Command("sh", "-c", c)
+		stdoutStderr, err := cmd.CombinedOutput()
+		if err != nil {
+			return errors.Wrap(err, "Failed running command: "+string(stdoutStderr))
+		}
+		Info(string(stdoutStderr))
+	}
+	return nil
+}
+
+func NewLuetFinalizerFromYaml(data []byte) (*LuetFinalizer, error) {
+	var p LuetFinalizer
+	err := yaml.Unmarshal(data, &p)
+	if err != nil {
+		return &p, err
+	}
+	return &p, err
+}