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go_repository: add 'clean' build_file_generation
Before bzlmod, repositories were global, and BUILD files inside upstream repositories could load from the repositories defined at the root-level WORKSPACE file. With the introduction of visibility rules, these result in errors that cannot trivially be worked around. One pattern that has emerged is ignoring existing build files by specifying `gazelle:build_file_name BUILD.bazel`, however this does not work for anything already using BUILD.bazel filenames. This does affect real-world users: an example is github.com/google/go-jsonnet which has a BUILD.bazel file to `genrule` its AST. The module is pure-go, but the build step contains cpp code, and when imported under bzlmod-gazelle will not work because the cpp code is invoked. As a workaround, there is now a 'jsonnet' BCR module. This patch introduces a `build_file_generation = clean` option, which removes existing build files before generating new ones. It allows loading the jsonnet code once again, and also makes it possible to load some of the complex protobuf repositories.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,37 @@ | ||
| /* Copyright 2024 The Bazel Authors. 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 main | ||
|
|
||
| import ( | ||
| "io/fs" | ||
| "os" | ||
| "path/filepath" | ||
| ) | ||
|
|
||
| func cleanBuildFiles(path string) error { | ||
| return filepath.Walk(*dest, func(path string, info fs.FileInfo, err error) error { | ||
| if err != nil { | ||
| return err | ||
| } | ||
| if info.IsDir() { | ||
| return nil | ||
| } | ||
| if info.Name() == "BUILD" || info.Name() == "BUILD.bazel" { | ||
| return os.Remove(path) | ||
| } | ||
| return nil | ||
| }) | ||
| } |
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