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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.runfiles/_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. Work towards #16124 PiperOrigin-RevId: 475820334 Change-Id: I885b4df093bd2c783c57d19f995f420b9b29b53c
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src/main/java/com/google/devtools/build/lib/analysis/RepoMappingManifestAction.java
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|---|---|---|
| @@ -0,0 +1,122 @@ | ||
| // 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; | ||
|
|
||
| import static java.nio.charset.StandardCharsets.ISO_8859_1; | ||
|
|
||
| import com.google.common.collect.ImmutableSortedMap; | ||
| import com.google.common.collect.Maps; | ||
| 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.RepositoryMapping; | ||
| 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 com.google.devtools.build.lib.vfs.OsPathPolicy; | ||
| import java.io.BufferedWriter; | ||
| import java.io.OutputStreamWriter; | ||
| import java.io.Writer; | ||
| import java.util.Map; | ||
| import java.util.Map.Entry; | ||
| import java.util.UUID; | ||
| import javax.annotation.Nullable; | ||
| import net.starlark.java.eval.EvalException; | ||
|
|
||
| /** 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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| private final ImmutableSortedMap<RepositoryName, ImmutableSortedMap<String, RepositoryName>> | ||
| reposAndMappings; | ||
| private final String workspaceName; | ||
|
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| public RepoMappingManifestAction( | ||
| ActionOwner owner, | ||
| Artifact output, | ||
| Map<RepositoryName, RepositoryMapping> reposAndMappings, | ||
| String workspaceName) { | ||
| super(owner, NestedSetBuilder.emptySet(Order.STABLE_ORDER), output, /*makeExecutable=*/ false); | ||
| this.reposAndMappings = | ||
| ImmutableSortedMap.copyOf( | ||
| Maps.transformValues( | ||
| reposAndMappings, repoMapping -> ImmutableSortedMap.copyOf(repoMapping.entries())), | ||
| (a, b) -> OsPathPolicy.getFilePathOs().compare(a.getName(), b.getName())); | ||
| 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<RepositoryName, ImmutableSortedMap<String, RepositoryName>> repoAndMapping : | ||
| reposAndMappings.entrySet()) { | ||
| fp.addString(repoAndMapping.getKey().getName()); | ||
| fp.addInt(repoAndMapping.getValue().size()); | ||
| for (Entry<String, RepositoryName> mappingEntry : repoAndMapping.getValue().entrySet()) { | ||
| fp.addString(mappingEntry.getKey()); | ||
| fp.addString(mappingEntry.getValue().getName()); | ||
| } | ||
| } | ||
| } | ||
|
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||
| @Override | ||
| public DeterministicWriter newDeterministicWriter(ActionExecutionContext ctx) | ||
| throws InterruptedException, ExecException { | ||
| return out -> { | ||
| Writer writer = new BufferedWriter(new OutputStreamWriter(out, ISO_8859_1)); | ||
| for (Entry<RepositoryName, ImmutableSortedMap<String, RepositoryName>> repoAndMapping : | ||
| reposAndMappings.entrySet()) { | ||
| for (Entry<String, RepositoryName> mappingEntry : repoAndMapping.getValue().entrySet()) { | ||
| if (mappingEntry.getKey().isEmpty()) { | ||
| // The apparent repo name can only be empty for the main repo. We skip this line. | ||
| continue; | ||
| } | ||
| writer.write(repoAndMapping.getKey().getName()); | ||
| writer.write(','); | ||
| writer.write(mappingEntry.getKey()); | ||
| writer.write(','); | ||
| if (mappingEntry.getValue().isMain()) { | ||
| writer.write(workspaceName); | ||
| } else { | ||
| writer.write(mappingEntry.getValue().getName()); | ||
| } | ||
| writer.write('\n'); | ||
| } | ||
| } | ||
| writer.flush(); | ||
| }; | ||
| } | ||
| } |
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