Do not load Android.mk files from the directories defined in the list.

This intial list contains the directories that don't have any Android.mk file, and this will prevent new Android.mk file being added in these directories.

Bug: 318428689
Test: CIs
Change-Id: Ifde1b77ad17b8bb2e7ba962229cee6ba267d6316

OWNERS

@@ -12,4 +12,6 @@ lamontjones@google.com
 mrziwang@google.com
 spandandas@google.com
 weiwli@google.com
-yudiliu@google.com
+yudiliu@google.com
+
+per-file build/soong/ui/build/androidmk_denylist.go = joeo@google.com, weiwli@google.com

ui/build/Android.bp

@@ -35,6 +35,7 @@ bootstrap_go_package {
         "blueprint",
         "blueprint-bootstrap",
         "blueprint-microfactory",
+        "soong-android",
         "soong-finder",
         "soong-remoteexec",
         "soong-shared",
@@ -46,6 +47,7 @@ bootstrap_go_package {
         "soong-ui-tracer",
     ],
     srcs: [
+        "androidmk_denylist.go",
         "build.go",
         "cleanbuild.go",
         "config.go",

ui/build/androidmk_denylist.go

@@ -0,0 +1,44 @@
+// Copyright 2024 Google Inc. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//	http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package build
+
+import (
+	"strings"
+
+	"android/soong/android"
+)
+
+var androidmk_denylist []string = []string{
+	"chained_build_config/",
+	"cts/",
+	"dalvik/",
+	"developers/",
+	"kernel/",
+	"libcore/",
+	"libnativehelper/",
+	"pdk/",
+	"toolchain/",
+}
+
+func blockAndroidMks(androidMks []string) []string {
+	return android.FilterListPred(androidMks, func(s string) bool {
+		for _, d := range androidmk_denylist {
+			if strings.HasPrefix(s, d) {
+				return false
+			}
+		}
+		return true
+	})
+}

ui/build/finder.go

@@ -128,6 +128,7 @@ func FindSources(ctx Context, config Config, f *finder.Finder) {
 
 	// Stop searching a subdirectory recursively after finding an Android.mk.
 	androidMks := f.FindFirstNamedAt(".", "Android.mk")
+	androidMks = blockAndroidMks(androidMks)
 	err := dumpListToFile(ctx, config, androidMks, filepath.Join(dumpDir, "Android.mk.list"))
 	if err != nil {
 		ctx.Fatalf("Could not export module list: %v", err)