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Write a repo mapping manifest in the runfiles directory
To ensure we can use repo mappings in the runfiles library, this change writes an extra file "my_binary_target.repo_mapping", which contains a bunch of (base_repo_canonical_name, apparent_repo_name, canonical_repo_name) triples. See https://github.com/bazelbuild/proposals/blob/main/designs/2022-07-21-locating-runfiles-with-bzlmod.md for more information. The extra file is written using a new action "RepoMappingManifestAction", and it's only executed if Bzlmod is enabled. This avoids generating a lot of extra actions that are essentially useless for monorepo setups such as Google's. Work towards #16124 PiperOrigin-RevId: 483735699 Change-Id: I885b4df093bd2c783c57d19f995f420b9b29b53c
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src/main/java/com/google/devtools/build/lib/analysis/RepoMappingManifestAction.java
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| // Copyright 2022 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 com.google.devtools.build.lib.analysis; | ||
|
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| import static java.nio.charset.StandardCharsets.ISO_8859_1; | ||
| import static java.util.Comparator.comparing; | ||
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| import com.google.auto.value.AutoValue; | ||
| import com.google.common.base.Preconditions; | ||
| import com.google.common.collect.ImmutableList; | ||
| import com.google.devtools.build.lib.actions.ActionExecutionContext; | ||
| import com.google.devtools.build.lib.actions.ActionKeyContext; | ||
| import com.google.devtools.build.lib.actions.ActionOwner; | ||
| import com.google.devtools.build.lib.actions.Artifact; | ||
| import com.google.devtools.build.lib.actions.Artifact.ArtifactExpander; | ||
| import com.google.devtools.build.lib.actions.CommandLineExpansionException; | ||
| import com.google.devtools.build.lib.actions.ExecException; | ||
| import com.google.devtools.build.lib.analysis.actions.AbstractFileWriteAction; | ||
| import com.google.devtools.build.lib.analysis.actions.DeterministicWriter; | ||
| import com.google.devtools.build.lib.cmdline.RepositoryName; | ||
| import com.google.devtools.build.lib.collect.nestedset.NestedSetBuilder; | ||
| import com.google.devtools.build.lib.collect.nestedset.Order; | ||
| import com.google.devtools.build.lib.util.Fingerprint; | ||
| import java.io.PrintWriter; | ||
| import java.util.List; | ||
| import java.util.UUID; | ||
| import javax.annotation.Nullable; | ||
| import net.starlark.java.eval.EvalException; | ||
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| /** Creates a manifest file describing the repos and mappings relevant for a runfile tree. */ | ||
| public class RepoMappingManifestAction extends AbstractFileWriteAction { | ||
| private static final UUID MY_UUID = UUID.fromString("458e351c-4d30-433d-b927-da6cddd4737f"); | ||
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|
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| private final ImmutableList<Entry> entries; | ||
| private final String workspaceName; | ||
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| /** An entry in the repo mapping manifest file. */ | ||
| @AutoValue | ||
| public abstract static class Entry { | ||
| public static Entry of( | ||
| RepositoryName sourceRepo, String targetRepoApparentName, RepositoryName targetRepo) { | ||
| return new AutoValue_RepoMappingManifestAction_Entry( | ||
| sourceRepo, targetRepoApparentName, targetRepo); | ||
| } | ||
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| public abstract RepositoryName sourceRepo(); | ||
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| public abstract String targetRepoApparentName(); | ||
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| public abstract RepositoryName targetRepo(); | ||
| } | ||
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| public RepoMappingManifestAction( | ||
| ActionOwner owner, Artifact output, List<Entry> entries, String workspaceName) { | ||
| super(owner, NestedSetBuilder.emptySet(Order.STABLE_ORDER), output, /*makeExecutable=*/ false); | ||
| this.entries = | ||
| ImmutableList.sortedCopyOf( | ||
| comparing((Entry e) -> e.sourceRepo().getName()) | ||
| .thenComparing(Entry::targetRepoApparentName), | ||
| entries); | ||
| this.workspaceName = workspaceName; | ||
| } | ||
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| @Override | ||
| public String getMnemonic() { | ||
| return "RepoMappingManifest"; | ||
| } | ||
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| @Override | ||
| protected String getRawProgressMessage() { | ||
| return "writing repo mapping manifest for " + getOwner().getLabel(); | ||
| } | ||
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| @Override | ||
| protected void computeKey( | ||
| ActionKeyContext actionKeyContext, | ||
| @Nullable ArtifactExpander artifactExpander, | ||
| Fingerprint fp) | ||
| throws CommandLineExpansionException, EvalException, InterruptedException { | ||
| fp.addUUID(MY_UUID); | ||
| fp.addString(workspaceName); | ||
| for (Entry entry : entries) { | ||
| fp.addString(entry.sourceRepo().getName()); | ||
| fp.addString(entry.targetRepoApparentName()); | ||
| fp.addString(entry.targetRepo().getName()); | ||
| } | ||
| } | ||
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| @Override | ||
| public DeterministicWriter newDeterministicWriter(ActionExecutionContext ctx) | ||
| throws InterruptedException, ExecException { | ||
| return out -> { | ||
| PrintWriter writer = new PrintWriter(out, /*autoFlush=*/ false, ISO_8859_1); | ||
| for (Entry entry : entries) { | ||
| if (entry.targetRepoApparentName().isEmpty()) { | ||
| // The apparent repo name can only be empty for the main repo. We skip this line as | ||
| // Rlocation paths can't reference an empty apparent name anyway. | ||
| Preconditions.checkArgument( | ||
| entry.sourceRepo().isMain(), | ||
| "only the main repo mapping can contain an entry with an empty apparent name"); | ||
| continue; | ||
| } | ||
| // The canonical name of the main repo is the empty string, which is not a valid name for a | ||
| // directory, so the "workspace name" is used the name of the directory under the runfiles | ||
| // tree for it. | ||
| String targetRepoDirectoryName = | ||
| entry.targetRepo().isMain() ? workspaceName : entry.targetRepo().getName(); | ||
| writer.format( | ||
| "%s,%s,%s\n", | ||
| entry.sourceRepo().getName(), entry.targetRepoApparentName(), targetRepoDirectoryName); | ||
| } | ||
| writer.flush(); | ||
| }; | ||
| } | ||
| } |
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