123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149 |
- // 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)
- }
|