refractor(build): move builder tasks to the builder sub package. Add tests.

pkg/prebuild/builder/userspace.go

@@ -0,0 +1,43 @@
+// apparmor.d - Full set of apparmor profiles
+// Copyright (C) 2021-2024 Alexandre Pujol <alexandre@pujol.io>
+// SPDX-License-Identifier: GPL-2.0-only
+
+package builder
+
+import (
+	"regexp"
+	"strings"
+
+	"github.com/roddhjav/apparmor.d/pkg/aa"
+	"github.com/roddhjav/apparmor.d/pkg/prebuild/cfg"
+)
+
+var (
+	regAttachments = regexp.MustCompile(`(profile .* @{exec_path})`)
+)
+
+type Userspace struct {
+	cfg.Base
+}
+
+func init() {
+	RegisterBuilder(&Userspace{
+		Base: cfg.Base{
+			Keyword: "userspace",
+			Msg:     "Bypass userspace tools restriction",
+		},
+	})
+}
+
+func (b Userspace) Apply(profile string) string {
+	p := aa.DefaultTunables()
+	p.ParseVariables(profile)
+	p.ResolveAttachments()
+	att := p.NestAttachments()
+	matches := regAttachments.FindAllString(profile, -1)
+	if len(matches) > 0 {
+		strheader := strings.Replace(matches[0], "@{exec_path}", att, -1)
+		return regAttachments.ReplaceAllLiteralString(profile, strheader)
+	}
+	return profile
+}