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// Copyright 2014 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.actions;
import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.devtools.build.lib.actions.AbstractAction;
import com.google.devtools.build.lib.actions.ActionExecutionContext;
import com.google.devtools.build.lib.actions.ActionExecutionException;
import com.google.devtools.build.lib.actions.ActionKeyContext;
import com.google.devtools.build.lib.actions.ActionOwner;
import com.google.devtools.build.lib.actions.ActionResult;
import com.google.devtools.build.lib.actions.Artifact;
import com.google.devtools.build.lib.concurrent.ThreadSafety.Immutable;
import com.google.devtools.build.lib.util.Fingerprint;
import com.google.devtools.build.lib.vfs.Path;
import javax.annotation.Nullable;
/**
* Action responsible for the symlink tree creation.
* Used to generate runfiles and fileset symlink farms.
*/
@Immutable
public final class SymlinkTreeAction extends AbstractAction {
private static final String GUID = "63412bda-4026-4c8e-a3ad-7deb397728d4";
private final Artifact inputManifest;
private final Artifact outputManifest;
private final boolean filesetTree;
private final ImmutableMap<String, String> shellEnvironment;
private final boolean enableRunfiles;
/**
* Creates SymlinkTreeAction instance.
* @param owner action owner
* @param inputManifest the input runfiles manifest
* @param artifactMiddleman the middleman artifact representing all the files the symlinks
* point to (on Windows we need to know if the target of a "symlink" is
* a directory or a file so we need to build it before)
* @param outputManifest the generated symlink tree manifest
* (must have "MANIFEST" base name). Symlink tree root
* will be set to the artifact's parent directory.
* @param filesetTree true if this is fileset symlink tree,
* @param enableRunfiles true is the actual symlink tree needs to be created.
*/
public SymlinkTreeAction(
ActionOwner owner,
Artifact inputManifest,
@Nullable Artifact artifactMiddleman,
Artifact outputManifest,
boolean filesetTree,
ImmutableMap<String, String> shellEnvironment,
boolean enableRunfiles) {
super(owner, computeInputs(inputManifest, artifactMiddleman), ImmutableList.of(outputManifest));
Preconditions.checkArgument(outputManifest.getPath().getBaseName().equals("MANIFEST"));
this.inputManifest = inputManifest;
this.outputManifest = outputManifest;
this.filesetTree = filesetTree;
this.shellEnvironment = shellEnvironment;
this.enableRunfiles = enableRunfiles;
}
private static ImmutableList<Artifact> computeInputs(
Artifact inputManifest, Artifact artifactMiddleman) {
ImmutableList.Builder<Artifact> result = ImmutableList.<Artifact>builder()
.add(inputManifest);
if (artifactMiddleman != null) {
Path path = artifactMiddleman.getPath();
if (!path.getFileSystem().supportsSymbolicLinksNatively(path)) {
result.add(artifactMiddleman);
}
}
return result.build();
}
public Artifact getInputManifest() {
return inputManifest;
}
public Artifact getOutputManifest() {
return outputManifest;
}
public boolean isFilesetTree() {
return filesetTree;
}
@Override
public String getMnemonic() {
return "SymlinkTree";
}
@Override
protected String getRawProgressMessage() {
return (filesetTree ? "Creating Fileset tree " : "Creating runfiles tree ")
+ outputManifest.getExecPath().getParentDirectory().getPathString();
}
@Override
protected String computeKey(ActionKeyContext actionKeyContext) {
Fingerprint f = new Fingerprint();
f.addString(GUID);
f.addInt(filesetTree ? 1 : 0);
return f.hexDigestAndReset();
}
@Override
public ActionResult execute(ActionExecutionContext actionExecutionContext)
throws ActionExecutionException, InterruptedException {
return ActionResult.create(
actionExecutionContext
.getContext(SymlinkTreeActionContext.class)
.createSymlinks(this, actionExecutionContext, shellEnvironment, enableRunfiles));
}
}
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