Dump bazel product config in Soong

Bug: 187862880
Test: build/bazel/ci/bp2build.sh
Test: build/soong/tests/bp2build_bazel_test.sh
Change-Id: I24b09baad973e25bec4476e1ea4a7692b72b7d20

android/bazel_handler.go

@@ -567,7 +567,7 @@ func (p *bazelPaths) intermediatesDir() string {
 // Returns the path where the contents of the @soong_injection repository live.
 // It is used by Soong to tell Bazel things it cannot over the command line.
 func (p *bazelPaths) injectedFilesDir() string {
-	return filepath.Join(p.buildDir, "soong_injection")
+	return filepath.Join(p.buildDir, bazel.SoongInjectionDirName)
 }
 
 // Returns the path of the synthetic Bazel workspace that contains a symlink

android/config.go

@@ -35,6 +35,7 @@ import (
 	"github.com/google/blueprint/proptools"
 
 	"android/soong/android/soongconfig"
+	"android/soong/bazel"
 	"android/soong/remoteexec"
 )
 
@@ -169,7 +170,7 @@ func loadConfig(config *config) error {
 
 // loadFromConfigFile loads and decodes configuration options from a JSON file
 // in the current working directory.
-func loadFromConfigFile(configurable jsonConfigurable, filename string) error {
+func loadFromConfigFile(configurable *productVariables, filename string) error {
 	// Try to open the file
 	configFileReader, err := os.Open(filename)
 	defer configFileReader.Close()
@@ -194,13 +195,20 @@ func loadFromConfigFile(configurable jsonConfigurable, filename string) error {
 		}
 	}
 
-	// No error
-	return nil
+	if Bool(configurable.GcovCoverage) && Bool(configurable.ClangCoverage) {
+		return fmt.Errorf("GcovCoverage and ClangCoverage cannot both be set")
+	}
+
+	configurable.Native_coverage = proptools.BoolPtr(
+		Bool(configurable.GcovCoverage) ||
+			Bool(configurable.ClangCoverage))
+
+	return saveToBazelConfigFile(configurable, filepath.Dir(filename))
 }
 
 // atomically writes the config file in case two copies of soong_build are running simultaneously
 // (for example, docs generation and ninja manifest generation)
-func saveToConfigFile(config jsonConfigurable, filename string) error {
+func saveToConfigFile(config *productVariables, filename string) error {
 	data, err := json.MarshalIndent(&config, "", "    ")
 	if err != nil {
 		return fmt.Errorf("cannot marshal config data: %s", err.Error())
@@ -229,6 +237,35 @@ func saveToConfigFile(config jsonConfigurable, filename string) error {
 	return nil
 }
 
+func saveToBazelConfigFile(config *productVariables, outDir string) error {
+	dir := filepath.Join(outDir, bazel.SoongInjectionDirName, "product_config")
+	err := createDirIfNonexistent(dir, os.ModePerm)
+	if err != nil {
+		return fmt.Errorf("Could not create dir %s: %s", dir, err)
+	}
+
+	data, err := json.MarshalIndent(&config, "", "    ")
+	if err != nil {
+		return fmt.Errorf("cannot marshal config data: %s", err.Error())
+	}
+
+	bzl := []string{
+		bazel.GeneratedBazelFileWarning,
+		fmt.Sprintf(`_product_vars = json.decode("""%s""")`, data),
+		"product_vars = _product_vars\n",
+	}
+	err = ioutil.WriteFile(filepath.Join(dir, "product_variables.bzl"), []byte(strings.Join(bzl, "\n")), 0644)
+	if err != nil {
+		return fmt.Errorf("Could not write .bzl config file %s", err)
+	}
+	err = ioutil.WriteFile(filepath.Join(dir, "BUILD"), []byte(bazel.GeneratedBazelFileWarning), 0644)
+	if err != nil {
+		return fmt.Errorf("Could not write BUILD config file %s", err)
+	}
+
+	return nil
+}
+
 // NullConfig returns a mostly empty Config for use by standalone tools like dexpreopt_gen that
 // use the android package.
 func NullConfig(buildDir string) Config {
@@ -448,14 +485,6 @@ func NewConfig(srcDir, buildDir string, moduleListFile string, availableEnv map[
 		config.AndroidFirstDeviceTarget = firstTarget(config.Targets[Android], "lib64", "lib32")[0]
 	}
 
-	if Bool(config.productVariables.GcovCoverage) && Bool(config.productVariables.ClangCoverage) {
-		return Config{}, fmt.Errorf("GcovCoverage and ClangCoverage cannot both be set")
-	}
-
-	config.productVariables.Native_coverage = proptools.BoolPtr(
-		Bool(config.productVariables.GcovCoverage) ||
-			Bool(config.productVariables.ClangCoverage))
-
 	config.BazelContext, err = NewBazelContext(config)
 	config.bp2buildPackageConfig = bp2buildDefaultConfig
 	config.bp2buildModuleTypeConfig = make(map[string]bool)

android/paths.go

@@ -1990,6 +1990,10 @@ func RemoveAllOutputDir(path WritablePath) error {
 
 func CreateOutputDirIfNonexistent(path WritablePath, perm os.FileMode) error {
 	dir := absolutePath(path.String())
+	return createDirIfNonexistent(dir, perm)
+}
+
+func createDirIfNonexistent(dir string, perm os.FileMode) error {
 	if _, err := os.Stat(dir); os.IsNotExist(err) {
 		return os.MkdirAll(dir, os.ModePerm)
 	} else {

android/variable.go

@@ -282,7 +282,7 @@ type productVariables struct {
 	NativeCoverageExcludePaths []string `json:",omitempty"`
 
 	// Set by NewConfig
-	Native_coverage *bool
+	Native_coverage *bool `json:",omitempty"`
 
 	SanitizeHost       []string `json:",omitempty"`
 	SanitizeDevice     []string `json:",omitempty"`

bazel/constants.go

@@ -18,6 +18,10 @@ const (
 
 	// Run bazel as a ninja executer
 	BazelNinjaExecRunName = RunName("bazel-ninja-exec")
+
+	SoongInjectionDirName = "soong_injection"
+
+	GeneratedBazelFileWarning = "# GENERATED FOR BAZEL FROM SOONG. DO NOT EDIT"
 )
 
 // String returns the name of the run.

bp2build/bp2build.go

@@ -16,6 +16,7 @@ package bp2build
 
 import (
 	"android/soong/android"
+	"android/soong/bazel"
 	"fmt"
 	"os"
 )
@@ -32,7 +33,7 @@ func Codegen(ctx *CodegenContext) CodegenMetrics {
 	bp2buildFiles := CreateBazelFiles(nil, buildToTargets, ctx.mode)
 	writeFiles(ctx, bp2buildDir, bp2buildFiles)
 
-	soongInjectionDir := android.PathForOutput(ctx, "soong_injection")
+	soongInjectionDir := android.PathForOutput(ctx, bazel.SoongInjectionDirName)
 	writeFiles(ctx, soongInjectionDir, CreateSoongInjectionFiles())
 
 	return metrics

tests/lib.sh

@@ -114,6 +114,7 @@ function create_mock_bazel() {
   symlink_directory prebuilts/jdk
 
   symlink_file WORKSPACE
+  symlink_file BUILD
   symlink_file tools/bazel
 }