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// Copyright 2016 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.rules.cpp;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableSortedMap;
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.skyframe.serialization.autocodec.AutoCodec;
import com.google.devtools.build.lib.util.Fingerprint;
import com.google.devtools.build.lib.vfs.FileSystem;
import com.google.devtools.build.lib.vfs.FileSystemUtils;
import com.google.devtools.build.lib.vfs.Path;
import com.google.devtools.build.lib.vfs.Symlinks;
import java.io.IOException;
import java.util.Map;
import java.util.SortedMap;
/** This action creates a set of symbolic links. */
@AutoCodec
@Immutable
public final class CreateIncSymlinkAction extends AbstractAction {
private final ImmutableSortedMap<Artifact, Artifact> symlinks;
private final Path includePath;
/**
* Creates a new instance. The symlinks map maps symlinks to their targets, i.e. the symlink paths
* must be unique, but several of them can point to the same target. All outputs must be under
* {@code includePath}.
*/
public CreateIncSymlinkAction(
ActionOwner owner, Map<Artifact, Artifact> symlinks, Path includePath) {
super(owner, ImmutableList.copyOf(symlinks.values()), ImmutableList.copyOf(symlinks.keySet()));
this.symlinks = ImmutableSortedMap.copyOf(symlinks, Artifact.EXEC_PATH_COMPARATOR);
this.includePath = includePath;
}
@Override
public void prepare(FileSystem fileSystem, Path execRoot) throws IOException {
if (includePath.isDirectory(Symlinks.NOFOLLOW)) {
FileSystemUtils.deleteTree(includePath);
}
super.prepare(fileSystem, execRoot);
}
@Override
public ActionResult execute(ActionExecutionContext actionExecutionContext)
throws ActionExecutionException {
try {
for (Map.Entry<Artifact, Artifact> entry : symlinks.entrySet()) {
Path symlink = actionExecutionContext.getInputPath(entry.getKey());
symlink.createSymbolicLink(actionExecutionContext.getInputPath(entry.getValue()));
}
} catch (IOException e) {
String message = "IO Error while creating symlink";
throw new ActionExecutionException(message, e, this, false);
}
return ActionResult.EMPTY;
}
@VisibleForTesting
public SortedMap<Artifact, Artifact> getSymlinks() {
return symlinks;
}
@Override
public void computeKey(ActionKeyContext actionKeyContext, Fingerprint fp) {
for (Map.Entry<Artifact, Artifact> entry : symlinks.entrySet()) {
fp.addPath(entry.getKey().getExecPath());
fp.addPath(entry.getValue().getExecPath());
}
}
@Override
protected String getRawProgressMessage() {
return null; // users don't really want to know about inc symlinks.
}
@Override
public String getMnemonic() {
return "Symlink";
}
}
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