| // 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) |
| } |