Output informational messages only when BP2BUILD_VERBOSE is set.

Test: manual
Change-Id: Ieeb00a002e07b04449d70614ce205c47c1dd7bce

bp2build/bp2build.go

@@ -40,7 +40,7 @@ func Codegen(ctx *CodegenContext) CodegenMetrics {
 		fmt.Printf("ERROR: Encountered %d error(s): \nERROR: %s", len(errs), strings.Join(errMsgs, "\n"))
 		os.Exit(1)
 	}
-	bp2buildFiles := CreateBazelFiles(nil, res.buildFileToTargets, ctx.mode)
+	bp2buildFiles := CreateBazelFiles(ctx.Config(), nil, res.buildFileToTargets, ctx.mode)
 	writeFiles(ctx, bp2buildDir, bp2buildFiles)
 
 	soongInjectionDir := android.PathForOutput(ctx, bazel.SoongInjectionDirName)

bp2build/bzl_conversion_test.go

@@ -189,7 +189,7 @@ func TestGenerateSoongModuleBzl(t *testing.T) {
 			content: "irrelevant",
 		},
 	}
-	files := CreateBazelFiles(ruleShims, make(map[string]BazelTargets), QueryView)
+	files := CreateBazelFiles(android.NullConfig("out", "out/soong"), ruleShims, make(map[string]BazelTargets), QueryView)
 
 	var actualSoongModuleBzl BazelFile
 	for _, f := range files {

bp2build/conversion.go

@@ -50,6 +50,7 @@ func convertedModules(convertedModules []string) string {
 }
 
 func CreateBazelFiles(
+	cfg android.Config,
 	ruleShims map[string]RuleShim,
 	buildToTargets map[string]BazelTargets,
 	mode CodegenMode) []BazelFile {
@@ -74,16 +75,19 @@ func CreateBazelFiles(
 		files = append(files, newFile(bazelRulesSubDir, "soong_module.bzl", generateSoongModuleBzl(ruleShims)))
 	}
 
-	files = append(files, createBuildFiles(buildToTargets, mode)...)
+	files = append(files, createBuildFiles(cfg, buildToTargets, mode)...)
 
 	return files
 }
 
-func createBuildFiles(buildToTargets map[string]BazelTargets, mode CodegenMode) []BazelFile {
+func createBuildFiles(cfg android.Config, buildToTargets map[string]BazelTargets, mode CodegenMode) []BazelFile {
 	files := make([]BazelFile, 0, len(buildToTargets))
+	warnNotWriting := cfg.IsEnvTrue("BP2BUILD_VERBOSE")
 	for _, dir := range android.SortedStringKeys(buildToTargets) {
 		if mode == Bp2Build && android.ShouldKeepExistingBuildFileForDir(dir) {
-			fmt.Printf("[bp2build] Not writing generated BUILD file for dir: '%s'\n", dir)
+			if warnNotWriting {
+				fmt.Printf("[bp2build] Not writing generated BUILD file for dir: '%s'\n", dir)
+			}
 			continue
 		}
 		targets := buildToTargets[dir]

bp2build/conversion_test.go

@@ -27,7 +27,8 @@ type bazelFilepath struct {
 }
 
 func TestCreateBazelFiles_QueryView_AddsTopLevelFiles(t *testing.T) {
-	files := CreateBazelFiles(map[string]RuleShim{}, map[string]BazelTargets{}, QueryView)
+	files := CreateBazelFiles(android.NullConfig("out", "out/soong"),
+		map[string]RuleShim{}, map[string]BazelTargets{}, QueryView)
 	expectedFilePaths := []bazelFilepath{
 		{
 			dir:      "",

bp2build/metrics.go

@@ -116,8 +116,6 @@ func (metrics *CodegenMetrics) Write(dir string) {
 	}
 	if _, err := os.Stat(metricsFile); err != nil {
 		fail(err, "MISSING BP2BUILD METRICS OUTPUT: Failed to `stat` %s", metricsFile)
-	} else {
-		fmt.Printf("\nWrote bp2build metrics to: %s\n", metricsFile)
 	}
 }
 

bp2build/symlink_forest.go

@@ -1,6 +1,7 @@
 package bp2build
 
 import (
+	"android/soong/android"
 	"fmt"
 	"io/ioutil"
 	"os"
@@ -114,7 +115,7 @@ func isDir(path string, fi os.FileInfo) bool {
 // contain every file in buildFilesDir and srcDir excluding the files in
 // exclude. Collects every directory encountered during the traversal of srcDir
 // into acc.
-func plantSymlinkForestRecursive(topdir string, forestDir string, buildFilesDir string, srcDir string, exclude *node, acc *[]string, okay *bool) {
+func plantSymlinkForestRecursive(cfg android.Config, topdir string, forestDir string, buildFilesDir string, srcDir string, exclude *node, acc *[]string, okay *bool) {
 	if exclude != nil && exclude.excluded {
 		// This directory is not needed, bail out
 		return
@@ -179,7 +180,7 @@ func plantSymlinkForestRecursive(topdir string, forestDir string, buildFilesDir
 			if bDir && excludeChild != nil {
 				// Not in the source tree, but we have to exclude something from under
 				// this subtree, so descend
-				plantSymlinkForestRecursive(topdir, forestChild, buildFilesChild, srcChild, excludeChild, acc, okay)
+				plantSymlinkForestRecursive(cfg, topdir, forestChild, buildFilesChild, srcChild, excludeChild, acc, okay)
 			} else {
 				// Not in the source tree, symlink BUILD file
 				symlinkIntoForest(topdir, forestChild, buildFilesChild)
@@ -188,19 +189,21 @@ func plantSymlinkForestRecursive(topdir string, forestDir string, buildFilesDir
 			if sDir && excludeChild != nil {
 				// Not in the build file tree, but we have to exclude something from
 				// under this subtree, so descend
-				plantSymlinkForestRecursive(topdir, forestChild, buildFilesChild, srcChild, excludeChild, acc, okay)
+				plantSymlinkForestRecursive(cfg, topdir, forestChild, buildFilesChild, srcChild, excludeChild, acc, okay)
 			} else {
 				// Not in the build file tree, symlink source tree, carry on
 				symlinkIntoForest(topdir, forestChild, srcChild)
 			}
 		} else if sDir && bDir {
 			// Both are directories. Descend.
-			plantSymlinkForestRecursive(topdir, forestChild, buildFilesChild, srcChild, excludeChild, acc, okay)
+			plantSymlinkForestRecursive(cfg, topdir, forestChild, buildFilesChild, srcChild, excludeChild, acc, okay)
 		} else if !sDir && !bDir {
 			// Neither is a directory. Prioritize BUILD files generated by bp2build
 			// over any BUILD file imported into external/.
-			fmt.Fprintf(os.Stderr, "Both '%s' and '%s' exist, symlinking the former to '%s'\n",
-				buildFilesChild, srcChild, forestChild)
+			if cfg.IsEnvTrue("BP2BUILD_VERBOSE") {
+				fmt.Fprintf(os.Stderr, "Both '%s' and '%s' exist, symlinking the former to '%s'\n",
+					buildFilesChild, srcChild, forestChild)
+			}
 			symlinkIntoForest(topdir, forestChild, buildFilesChild)
 		} else {
 			// Both exist and one is a file. This is an error.
@@ -216,12 +219,12 @@ func plantSymlinkForestRecursive(topdir string, forestDir string, buildFilesDir
 // "srcDir" while excluding paths listed in "exclude". Returns the set of paths
 // under srcDir on which readdir() had to be called to produce the symlink
 // forest.
-func PlantSymlinkForest(topdir string, forest string, buildFiles string, srcDir string, exclude []string) []string {
+func PlantSymlinkForest(cfg android.Config, topdir string, forest string, buildFiles string, srcDir string, exclude []string) []string {
 	deps := make([]string, 0)
 	os.RemoveAll(shared.JoinPath(topdir, forest))
 	excludeTree := treeFromExcludePathList(exclude)
 	okay := true
-	plantSymlinkForestRecursive(topdir, forest, buildFiles, srcDir, excludeTree, &deps, &okay)
+	plantSymlinkForestRecursive(cfg, topdir, forest, buildFiles, srcDir, excludeTree, &deps, &okay)
 	if !okay {
 		os.Exit(1)
 	}

cmd/soong_build/main.go

@@ -552,7 +552,7 @@ func runBp2Build(configuration android.Config, extraNinjaDeps []string) {
 		excludes = append(excludes, getTemporaryExcludes()...)
 
 		symlinkForestDeps := bp2build.PlantSymlinkForest(
-			topDir, workspaceRoot, generatedRoot, ".", excludes)
+			configuration, topDir, workspaceRoot, generatedRoot, ".", excludes)
 
 		ninjaDeps = append(ninjaDeps, codegenContext.AdditionalNinjaDeps()...)
 		ninjaDeps = append(ninjaDeps, symlinkForestDeps...)
@@ -566,7 +566,9 @@ func runBp2Build(configuration android.Config, extraNinjaDeps []string) {
 	// Only report metrics when in bp2build mode. The metrics aren't relevant
 	// for queryview, since that's a total repo-wide conversion and there's a
 	// 1:1 mapping for each module.
-	metrics.Print()
+	if configuration.IsEnvTrue("BP2BUILD_VERBOSE") {
+		metrics.Print()
+	}
 	writeBp2BuildMetrics(&metrics, configuration, eventHandler)
 }
 

cmd/soong_build/queryview.go

@@ -32,7 +32,8 @@ func createBazelQueryView(ctx *bp2build.CodegenContext, bazelQueryViewDir string
 		panic(err)
 	}
 
-	filesToWrite := bp2build.CreateBazelFiles(ruleShims, res.BuildDirToTargets(), bp2build.QueryView)
+	filesToWrite := bp2build.CreateBazelFiles(ctx.Config(), ruleShims, res.BuildDirToTargets(),
+		bp2build.QueryView)
 	for _, f := range filesToWrite {
 		if err := writeReadOnlyFile(bazelQueryViewDir, f); err != nil {
 			return err