Generate a BUILD file for every Android.bp file in api_bp2build

workspace.

This is necessary to solve bazel package boundary issues where the api
file might exist in a different directory

Test: m api_bp2build && build/bazel/bin/bazel build --config=android
--config=api_bp2build //build/orchestrator/apis:system
Test: multitree_build system/nothing (in multitree)

Change-Id: Id64085d65a1943bdb394ea80c875db96ca373839

cmd/soong_build/main.go

@@ -136,7 +136,7 @@ func runQueryView(queryviewDir, queryviewMarker string, ctx *android.Context) {
 	ctx.EventHandler.Begin("queryview")
 	defer ctx.EventHandler.End("queryview")
 	codegenContext := bp2build.NewCodegenContext(ctx.Config(), ctx, bp2build.QueryView, topDir)
-	err := createBazelWorkspace(codegenContext, shared.JoinPath(topDir, queryviewDir))
+	err := createBazelWorkspace(codegenContext, shared.JoinPath(topDir, queryviewDir), false)
 	maybeQuit(err, "")
 	touch(shared.JoinPath(topDir, queryviewMarker))
 }
@@ -174,7 +174,28 @@ func runApiBp2build(ctx *android.Context, extraNinjaDeps []string) string {
 	// Run codegen to generate BUILD files
 	codegenContext := bp2build.NewCodegenContext(ctx.Config(), ctx, bp2build.ApiBp2build, topDir)
 	absoluteApiBp2buildDir := shared.JoinPath(topDir, cmdlineArgs.BazelApiBp2buildDir)
-	err := createBazelWorkspace(codegenContext, absoluteApiBp2buildDir)
+	// Always generate bp2build_all_srcs filegroups in api_bp2build.
+	// This is necessary to force each Android.bp file to create an equivalent BUILD file
+	// and prevent package boundray issues.
+	// e.g.
+	// Source
+	// f/b/Android.bp
+	// java_library{
+	//   name: "foo",
+	//   api: "api/current.txt",
+	// }
+	//
+	// f/b/api/Android.bp <- will cause package boundary issues
+	//
+	// Gen
+	// f/b/BUILD
+	// java_contribution{
+	//   name: "foo.contribution",
+	//   api: "//f/b/api:current.txt",
+	// }
+	//
+	// If we don't generate f/b/api/BUILD, foo.contribution will be unbuildable.
+	err := createBazelWorkspace(codegenContext, absoluteApiBp2buildDir, true)
 	maybeQuit(err, "")
 	ninjaDeps = append(ninjaDeps, codegenContext.AdditionalNinjaDeps()...)
 

cmd/soong_build/queryview.go

@@ -25,11 +25,11 @@ import (
 )
 
 // A helper function to generate a Read-only Bazel workspace in outDir
-func createBazelWorkspace(ctx *bp2build.CodegenContext, outDir string) error {
+func createBazelWorkspace(ctx *bp2build.CodegenContext, outDir string, generateFilegroups bool) error {
 	os.RemoveAll(outDir)
 	ruleShims := bp2build.CreateRuleShims(android.ModuleTypeFactories())
 
-	res, err := bp2build.GenerateBazelTargets(ctx, false)
+	res, err := bp2build.GenerateBazelTargets(ctx, generateFilegroups)
 	if err != nil {
 		panic(err)
 	}