| // 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.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.util.Fingerprint; |
| import com.google.devtools.build.lib.util.Preconditions; |
| 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 |
| 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; |
| } |
| } |