Subsume INTEGRATED_BP2BUILD into other env modes

This refactors bazel-build mode determination logic in soong_ui so it's
clearer which of three possible modes are being used in a given
invocation (NO_BAZEL, GENERATE_BUILD_FILES, or MIXED_BUILDS).

Test: bootstrap tests
Change-Id: I41d2baebf8d560c2cc42db8daa8b936101d453e3

cmd/soong_build/main.go

@@ -174,7 +174,7 @@ func writeJsonModuleGraph(configuration android.Config, ctx *android.Context, pa
 }
 
 func doChosenActivity(configuration android.Config, extraNinjaDeps []string) string {
-	bazelConversionRequested := configuration.IsEnvTrue("GENERATE_BAZEL_FILES") || bp2buildMarker != ""
+	bazelConversionRequested := bp2buildMarker != ""
 	mixedModeBuild := configuration.BazelContext.BazelEnabled()
 	generateQueryView := bazelQueryViewDir != ""
 	jsonModuleFile := configuration.Getenv("SOONG_DUMP_JSON_MODULE_GRAPH")

tests/bootstrap_test.sh

@@ -482,14 +482,14 @@ function test_null_build_after_docs {
   fi
 }
 
-function test_integrated_bp2build_smoke {
+function test_bp2build_smoke {
   setup
-  INTEGRATED_BP2BUILD=1 run_soong
+  GENERATE_BAZEL_FILES=1 run_soong
   [[ -e out/soong/.bootstrap/bp2build_workspace_marker ]] || fail "bp2build marker file not created"
   [[ -e out/soong/workspace ]] || fail "Bazel workspace not created"
 }
 
-function test_integrated_bp2build_add_android_bp {
+function test_bp2build_add_android_bp {
   setup
 
   mkdir -p a
@@ -502,7 +502,7 @@ filegroup {
 }
 EOF
 
-  INTEGRATED_BP2BUILD=1 run_soong
+  GENERATE_BAZEL_FILES=1 run_soong
   [[ -e out/soong/bp2build/a/BUILD ]] || fail "a/BUILD not created"
   [[ -L out/soong/workspace/a/BUILD ]] || fail "a/BUILD not symlinked"
 
@@ -516,18 +516,18 @@ filegroup {
 }
 EOF
 
-  INTEGRATED_BP2BUILD=1 run_soong
+  GENERATE_BAZEL_FILES=1 run_soong
   [[ -e out/soong/bp2build/b/BUILD ]] || fail "a/BUILD not created"
   [[ -L out/soong/workspace/b/BUILD ]] || fail "a/BUILD not symlinked"
 }
 
-function test_integrated_bp2build_null_build {
+function test_bp2build_null_build {
   setup
 
-  INTEGRATED_BP2BUILD=1 run_soong
+  GENERATE_BAZEL_FILES=1 run_soong
   local mtime1=$(stat -c "%y" out/soong/build.ninja)
 
-  INTEGRATED_BP2BUILD=1 run_soong
+  GENERATE_BAZEL_FILES=1 run_soong
   local mtime2=$(stat -c "%y" out/soong/build.ninja)
 
   if [[ "$mtime1" != "$mtime2" ]]; then
@@ -535,7 +535,7 @@ function test_integrated_bp2build_null_build {
   fi
 }
 
-function test_integrated_bp2build_add_to_glob {
+function test_bp2build_add_to_glob {
   setup
 
   mkdir -p a
@@ -548,11 +548,11 @@ filegroup {
 }
 EOF
 
-  INTEGRATED_BP2BUILD=1 run_soong
+  GENERATE_BAZEL_FILES=1 run_soong
   grep -q a1.txt out/soong/bp2build/a/BUILD || fail "a1.txt not in BUILD file"
 
   touch a/a2.txt
-  INTEGRATED_BP2BUILD=1 run_soong
+  GENERATE_BAZEL_FILES=1 run_soong
   grep -q a2.txt out/soong/bp2build/a/BUILD || fail "a2.txt not in BUILD file"
 }
 
@@ -564,7 +564,7 @@ function test_dump_json_module_graph() {
   fi
 }
 
-function test_integrated_bp2build_bazel_workspace_structure {
+function test_bp2build_bazel_workspace_structure {
   setup
 
   mkdir -p a/b
@@ -578,7 +578,7 @@ filegroup {
 }
 EOF
 
-  INTEGRATED_BP2BUILD=1 run_soong
+  GENERATE_BAZEL_FILES=1 run_soong
   [[ -e out/soong/workspace ]] || fail "Bazel workspace not created"
   [[ -d out/soong/workspace/a/b ]] || fail "module directory not a directory"
   [[ -L out/soong/workspace/a/b/BUILD ]] || fail "BUILD file not symlinked"
@@ -589,7 +589,7 @@ EOF
   [[ ! -e out/soong/workspace/out ]] || fail "out directory symlinked"
 }
 
-function test_integrated_bp2build_bazel_workspace_add_file {
+function test_bp2build_bazel_workspace_add_file {
   setup
 
   mkdir -p a
@@ -602,10 +602,10 @@ filegroup {
 }
 EOF
 
-  INTEGRATED_BP2BUILD=1 run_soong
+  GENERATE_BAZEL_FILES=1 run_soong
 
   touch a/a2.txt  # No reference in the .bp file needed
-  INTEGRATED_BP2BUILD=1 run_soong
+  GENERATE_BAZEL_FILES=1 run_soong
   [[ -L out/soong/workspace/a/a2.txt ]] || fail "a/a2.txt not symlinked"
 }
 
@@ -622,9 +622,9 @@ test_add_file_to_soong_build
 test_glob_during_bootstrapping
 test_soong_build_rerun_iff_environment_changes
 test_dump_json_module_graph
-test_integrated_bp2build_smoke
-test_integrated_bp2build_null_build
-test_integrated_bp2build_add_android_bp
-test_integrated_bp2build_add_to_glob
-test_integrated_bp2build_bazel_workspace_structure
-test_integrated_bp2build_bazel_workspace_add_file
+test_bp2build_smoke
+test_bp2build_null_build
+test_bp2build_add_android_bp
+test_bp2build_add_to_glob
+test_bp2build_bazel_workspace_structure
+test_bp2build_bazel_workspace_add_file

ui/build/build.go

@@ -258,8 +258,8 @@ func Build(ctx Context, config Config, what int) {
 		// Run Soong
 		runSoong(ctx, config)
 
-		if config.Environment().IsEnvTrue("GENERATE_BAZEL_FILES") {
-			// Return early, if we're using Soong as the bp2build converter.
+		if config.bazelBuildMode() == generateBuildFiles {
+			// Return early, if we're using Soong as solely the generator of BUILD files.
 			return
 		}
 	}

ui/build/config.go

@@ -93,6 +93,21 @@ const (
 	BUILD_MODULES
 )
 
+type bazelBuildMode int
+
+// Bazel-related build modes.
+const (
+	// Don't use bazel at all.
+	noBazel bazelBuildMode = iota
+
+	// Only generate build files (in a subdirectory of the out directory) and exit.
+	generateBuildFiles
+
+	// Generate synthetic build files and incorporate these files into a build which
+	// partially uses Bazel. Build metadata may come from Android.bp or BUILD files.
+	mixedBuild
+)
+
 // checkTopDir validates that the current directory is at the root directory of the source tree.
 func checkTopDir(ctx Context) {
 	if _, err := os.Stat(srcDirFileCheck); err != nil {
@@ -897,6 +912,16 @@ func (c *configImpl) UseBazel() bool {
 	return c.useBazel
 }
 
+func (c *configImpl) bazelBuildMode() bazelBuildMode {
+	if c.Environment().IsEnvTrue("USE_BAZEL_ANALYSIS") {
+		return mixedBuild
+	} else if c.Environment().IsEnvTrue("GENERATE_BAZEL_FILES") {
+		return generateBuildFiles
+	} else {
+		return noBazel
+	}
+}
+
 func (c *configImpl) StartRBE() bool {
 	if !c.UseRBE() {
 		return false

ui/build/soong.go

@@ -206,7 +206,8 @@ func runSoong(ctx Context, config Config) {
 		}
 	}
 
-	integratedBp2Build := config.Environment().IsEnvTrue("INTEGRATED_BP2BUILD")
+	buildMode := config.bazelBuildMode()
+	integratedBp2Build := (buildMode == mixedBuild) || (buildMode == generateBuildFiles)
 
 	// This is done unconditionally, but does not take a measurable amount of time
 	bootstrapBlueprint(ctx, config, integratedBp2Build)
@@ -312,7 +313,7 @@ func runSoong(ctx Context, config Config) {
 
 func shouldCollectBuildSoongMetrics(config Config) bool {
 	// Do not collect metrics protobuf if the soong_build binary ran as the bp2build converter.
-	return config.Environment().IsFalse("GENERATE_BAZEL_FILES")
+	return config.bazelBuildMode() != generateBuildFiles
 }
 
 func loadSoongBuildMetrics(ctx Context, config Config) *soong_metrics_proto.SoongBuildMetrics {