build: enable re-attach disconnected path by default

Ignored on Ubuntu 25.04 and abi3.0

pkg/prebuild/prepare/attach.go

@@ -0,0 +1,37 @@
+// apparmor.d - Full set of apparmor profiles
+// Copyright (C) 2021-2025 Alexandre Pujol <alexandre@pujol.io>
+// SPDX-License-Identifier: GPL-2.0-only
+
+package prepare
+
+import (
+	"strings"
+
+	"github.com/roddhjav/apparmor.d/pkg/prebuild"
+)
+
+type ReAttach struct {
+	prebuild.Base
+}
+
+func init() {
+	RegisterTask(&ReAttach{
+		Base: prebuild.Base{
+			Keyword: "attach",
+			Msg:     "Configure tunable for re-attached path",
+		},
+	})
+}
+
+func (p ReAttach) Apply() ([]string, error) {
+	res := []string{}
+
+	// Remove the @{att} tunable that is going to be defined in profile header
+	path := prebuild.RootApparmord.Join("tunables/multiarch.d/system")
+	out, err := path.ReadFileAsString()
+	if err != nil {
+		return res, err
+	}
+	out = strings.ReplaceAll(out, "@{att}=/", "# @{att}=/")
+	return res, path.WriteFile([]byte(out))
+}