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// 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 (
"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)
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)
}
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