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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.Iterables;
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.ActionOwner;
import com.google.devtools.build.lib.actions.Artifact;
import com.google.devtools.build.lib.actions.Executor;
import com.google.devtools.build.lib.actions.ResourceSet;
import com.google.devtools.build.lib.util.Fingerprint;
import com.google.devtools.build.lib.vfs.Path;
import com.google.devtools.build.lib.vfs.PathFragment;
import java.io.IOException;
/**
* Action to create a symbolic link.
*/
public class SymlinkAction extends AbstractAction {
private static final String GUID = "349675b5-437c-4da8-891a-7fb98fba6ab5";
private final PathFragment inputPath;
private final Artifact output;
private final String progressMessage;
/**
* Creates a new SymlinkAction instance.
*
* @param owner the action owner.
* @param input the Artifact that will be the src of the symbolic link.
* @param output the Artifact that will be created by executing this Action.
* @param progressMessage the progress message.
*/
public SymlinkAction(ActionOwner owner, Artifact input, Artifact output,
String progressMessage) {
// These actions typically have only one input and one output, which
// become the sole and primary in their respective lists.
this(owner, input.getExecPath(), input, output, progressMessage);
}
/**
* Creates a new SymlinkAction instance, where the inputPath
* may be different than that input artifact's path. This is
* only useful when dealing with runfiles trees where
* link target is a directory.
*
* @param owner the action owner.
* @param inputPath the Path that will be the src of the symbolic link.
* @param input the Artifact that is required to build the inputPath.
* @param output the Artifact that will be created by executing this Action.
* @param progressMessage the progress message.
*/
public SymlinkAction(ActionOwner owner, PathFragment inputPath, Artifact input,
Artifact output, String progressMessage) {
super(owner, ImmutableList.of(input), ImmutableList.of(output));
this.inputPath = Preconditions.checkNotNull(inputPath);
this.output = Preconditions.checkNotNull(output);
this.progressMessage = progressMessage;
}
public PathFragment getInputPath() {
return inputPath;
}
public Path getOutputPath() {
return output.getPath();
}
@Override
public void execute(ActionExecutionContext actionExecutionContext)
throws ActionExecutionException {
try {
getOutputPath().createSymbolicLink(
actionExecutionContext.getExecutor().getExecRoot().getRelative(inputPath));
} catch (IOException e) {
throw new ActionExecutionException("failed to create symbolic link '"
+ Iterables.getOnlyElement(getOutputs()).prettyPrint()
+ "' to the '" + Iterables.getOnlyElement(getInputs()).prettyPrint()
+ "' due to I/O error: " + e.getMessage(), e, this, false);
}
}
@Override
public ResourceSet estimateResourceConsumption(Executor executor) {
return ResourceSet.createWithRamCpuIo(/*memoryMb=*/0, /*cpuUsage=*/0, /*ioUsage=*/0.0);
}
@Override
protected String computeKey() {
Fingerprint f = new Fingerprint();
f.addString(GUID);
// We don't normally need to add inputs to the key. In this case, however, the inputPath can be
// different from the actual input artifact.
f.addPath(inputPath);
return f.hexDigestAndReset();
}
@Override
public String getMnemonic() {
return "Symlink";
}
@Override
protected String getRawProgressMessage() {
return progressMessage;
}
@Override
public String describeStrategy(Executor executor) {
return "local";
}
}
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