// Copyright 2020 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 bp2build import ( "android/soong/starlark_import" "fmt" "os" "path/filepath" "strings" "android/soong/android" "android/soong/bazel" "android/soong/shared" ) func deleteFilesExcept(ctx *CodegenContext, rootOutputPath android.OutputPath, except []BazelFile) { // Delete files that should no longer be present. bp2buildDirAbs := shared.JoinPath(ctx.topDir, rootOutputPath.String()) filesToDelete := make(map[string]struct{}) err := filepath.Walk(bp2buildDirAbs, func(path string, info os.FileInfo, err error) error { if err != nil { return err } if !info.IsDir() { relPath, err := filepath.Rel(bp2buildDirAbs, path) if err != nil { return err } filesToDelete[relPath] = struct{}{} } return nil }) if err != nil { fmt.Printf("ERROR reading %s: %s", bp2buildDirAbs, err) os.Exit(1) } for _, bazelFile := range except { filePath := filepath.Join(bazelFile.Dir, bazelFile.Basename) delete(filesToDelete, filePath) } for f, _ := range filesToDelete { absPath := shared.JoinPath(bp2buildDirAbs, f) if err := os.RemoveAll(absPath); err != nil { fmt.Printf("ERROR deleting %s: %s", absPath, err) os.Exit(1) } } } // Codegen is the backend of bp2build. The code generator is responsible for // writing .bzl files that are equivalent to Android.bp files that are capable // of being built with Bazel. func Codegen(ctx *CodegenContext) *CodegenMetrics { // This directory stores BUILD files that could be eventually checked-in. bp2buildDir := android.PathForOutput(ctx, "bp2build") res, errs := GenerateBazelTargets(ctx, true) if len(errs) > 0 { errMsgs := make([]string, len(errs)) for i, err := range errs { errMsgs[i] = fmt.Sprintf("%q", err) } fmt.Printf("ERROR: Encountered %d error(s): \nERROR: %s", len(errs), strings.Join(errMsgs, "\n")) os.Exit(1) } bp2buildFiles := CreateBazelFiles(ctx.Config(), nil, res.buildFileToTargets, ctx.mode) writeFiles(ctx, bp2buildDir, bp2buildFiles) // Delete files under the bp2build root which weren't just written. An // alternative would have been to delete the whole directory and write these // files. However, this would regenerate files which were otherwise unchanged // since the last bp2build run, which would have negative incremental // performance implications. deleteFilesExcept(ctx, bp2buildDir, bp2buildFiles) injectionFiles, err := CreateSoongInjectionDirFiles(ctx, res.metrics) if err != nil { fmt.Printf("%s\n", err.Error()) os.Exit(1) } writeFiles(ctx, android.PathForOutput(ctx, bazel.SoongInjectionDirName), injectionFiles) starlarkDeps, err := starlark_import.GetNinjaDeps() if err != nil { fmt.Fprintf(os.Stderr, "%s\n", err) os.Exit(1) } ctx.AddNinjaFileDeps(starlarkDeps...) return &res.metrics } // Wrapper function that will be responsible for all files in soong_injection directory // This includes // 1. config value(s) that are hardcoded in Soong // 2. product_config variables func CreateSoongInjectionDirFiles(ctx *CodegenContext, metrics CodegenMetrics) ([]BazelFile, error) { var ret []BazelFile productConfigFiles, err := CreateProductConfigFiles(ctx) if err != nil { return nil, err } ret = append(ret, productConfigFiles...) injectionFiles, err := soongInjectionFiles(ctx.Config(), metrics) if err != nil { return nil, err } ret = append(ret, injectionFiles...) return ret, nil } // Get the output directory and create it if it doesn't exist. func getOrCreateOutputDir(outputDir android.OutputPath, ctx android.PathContext, dir string) android.OutputPath { dirPath := outputDir.Join(ctx, dir) if err := android.CreateOutputDirIfNonexistent(dirPath, os.ModePerm); err != nil { fmt.Printf("ERROR: path %s: %s", dirPath, err.Error()) } return dirPath } // writeFiles materializes a list of BazelFile rooted at outputDir. func writeFiles(ctx android.PathContext, outputDir android.OutputPath, files []BazelFile) { for _, f := range files { p := getOrCreateOutputDir(outputDir, ctx, f.Dir).Join(ctx, f.Basename) if err := writeFile(p, f.Contents); err != nil { panic(fmt.Errorf("Failed to write %q (dir %q) due to %q", f.Basename, f.Dir, err)) } } } func writeFile(pathToFile android.OutputPath, content string) error { // These files are made editable to allow users to modify and iterate on them // in the source tree. return android.WriteFileToOutputDir(pathToFile, []byte(content), 0644) }