77 lines
2.8 KiB
Go
77 lines
2.8 KiB
Go
// Copyright 2020 Google Inc. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package bp2build
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import (
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"fmt"
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"os"
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"strings"
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"android/soong/android"
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"android/soong/bazel"
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)
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// Codegen is the backend of bp2build. The code generator is responsible for
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// writing .bzl files that are equivalent to Android.bp files that are capable
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// of being built with Bazel.
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func Codegen(ctx *CodegenContext) CodegenMetrics {
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// This directory stores BUILD files that could be eventually checked-in.
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bp2buildDir := android.PathForOutput(ctx, "bp2build")
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if err := android.RemoveAllOutputDir(bp2buildDir); err != nil {
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fmt.Printf("ERROR: Encountered error while cleaning %s: %s", bp2buildDir, err.Error())
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}
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res, errs := GenerateBazelTargets(ctx, true)
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if len(errs) > 0 {
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errMsgs := make([]string, len(errs))
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for i, err := range errs {
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errMsgs[i] = fmt.Sprintf("%q", err)
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}
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fmt.Printf("ERROR: Encountered %d error(s): \nERROR: %s", len(errs), strings.Join(errMsgs, "\n"))
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os.Exit(1)
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}
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bp2buildFiles := CreateBazelFiles(ctx.Config(), nil, res.buildFileToTargets, ctx.mode)
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writeFiles(ctx, bp2buildDir, bp2buildFiles)
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soongInjectionDir := android.PathForOutput(ctx, bazel.SoongInjectionDirName)
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writeFiles(ctx, soongInjectionDir, CreateSoongInjectionFiles(ctx.Config(), res.metrics))
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return res.metrics
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}
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// Get the output directory and create it if it doesn't exist.
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func getOrCreateOutputDir(outputDir android.OutputPath, ctx android.PathContext, dir string) android.OutputPath {
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dirPath := outputDir.Join(ctx, dir)
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if err := android.CreateOutputDirIfNonexistent(dirPath, os.ModePerm); err != nil {
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fmt.Printf("ERROR: path %s: %s", dirPath, err.Error())
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}
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return dirPath
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}
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// writeFiles materializes a list of BazelFile rooted at outputDir.
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func writeFiles(ctx android.PathContext, outputDir android.OutputPath, files []BazelFile) {
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for _, f := range files {
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p := getOrCreateOutputDir(outputDir, ctx, f.Dir).Join(ctx, f.Basename)
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if err := writeFile(p, f.Contents); err != nil {
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panic(fmt.Errorf("Failed to write %q (dir %q) due to %q", f.Basename, f.Dir, err))
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}
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}
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}
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func writeFile(pathToFile android.OutputPath, content string) error {
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// These files are made editable to allow users to modify and iterate on them
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// in the source tree.
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return android.WriteFileToOutputDir(pathToFile, []byte(content), 0644)
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}
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