refractor(build): move prepare tasks to the prepare sub package.

pkg/prebuild/prepare/merge.go

@@ -0,0 +1,61 @@
+// apparmor.d - Full set of apparmor profiles
+// Copyright (C) 2021-2024 Alexandre Pujol <alexandre@pujol.io>
+// SPDX-License-Identifier: GPL-2.0-only
+
+package prepare
+
+import (
+	"os"
+	"path/filepath"
+
+	"github.com/arduino/go-paths-helper"
+	"github.com/roddhjav/apparmor.d/pkg/prebuild/cfg"
+)
+
+type Merge struct {
+	cfg.Base
+}
+
+func init() {
+	RegisterTask(&Merge{
+		Base: cfg.Base{
+			Keyword: "merge",
+			Msg:     "Merge all profiles into a unified apparmor.d directory",
+		},
+	})
+}
+
+func (p Merge) Apply() ([]string, error) {
+	res := []string{}
+	dirToMerge := []string{
+		"groups/*/*", "groups",
+		"profiles-*-*/*", "profiles-*",
+	}
+
+	idx := 0
+	for idx < len(dirToMerge)-1 {
+		dirMoved, dirRemoved := dirToMerge[idx], dirToMerge[idx+1]
+		files, err := filepath.Glob(cfg.RootApparmord.Join(dirMoved).String())
+		if err != nil {
+			return res, err
+		}
+		for _, file := range files {
+			err := os.Rename(file, cfg.RootApparmord.Join(filepath.Base(file)).String())
+			if err != nil {
+				return res, err
+			}
+		}
+
+		files, err = filepath.Glob(cfg.RootApparmord.Join(dirRemoved).String())
+		if err != nil {
+			return []string{}, err
+		}
+		for _, file := range files {
+			if err := paths.New(file).RemoveAll(); err != nil {
+				return res, err
+			}
+		}
+		idx = idx + 2
+	}
+	return res, nil
+}