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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.rules.repository;
import com.google.devtools.build.lib.analysis.BlazeDirectories;
import com.google.devtools.build.lib.analysis.RuleDefinition;
import com.google.devtools.build.lib.packages.Rule;
import com.google.devtools.build.lib.skyframe.DirectoryListingValue;
import com.google.devtools.build.lib.skyframe.InconsistentFilesystemException;
import com.google.devtools.build.lib.vfs.FileSystem;
import com.google.devtools.build.lib.vfs.Path;
import com.google.devtools.build.lib.vfs.PathFragment;
import com.google.devtools.build.lib.vfs.RootedPath;
import com.google.devtools.build.skyframe.SkyFunction.Environment;
import com.google.devtools.build.skyframe.SkyFunctionException;
import com.google.devtools.build.skyframe.SkyKey;
import com.google.devtools.build.skyframe.SkyValue;
import java.io.IOException;
/**
* Create a repository from a directory on the local filesystem.
*/
public class NewLocalRepositoryFunction extends RepositoryFunction {
@Override
public boolean isLocal(Rule rule) {
return true;
}
@Override
public SkyValue fetch(
Rule rule, Path outputDirectory, BlazeDirectories directories, Environment env)
throws SkyFunctionException, InterruptedException {
NewRepositoryBuildFileHandler buildFileHandler =
new NewRepositoryBuildFileHandler(directories.getWorkspace());
if (!buildFileHandler.prepareBuildFile(rule, env)) {
return null;
}
PathFragment pathFragment = getTargetPath(rule, directories.getWorkspace());
FileSystem fs = directories.getOutputBase().getFileSystem();
Path path = fs.getPath(pathFragment);
// fetch() creates symlinks to each child under 'path' and DiffAwareness handles checking all
// of these files and directories for changes. However, if a new file/directory is added
// directly under 'path', Bazel doesn't know that this has to be symlinked in. Thus, this
// creates a dependency on the contents of the 'path' directory.
SkyKey dirKey = DirectoryListingValue.key(
RootedPath.toRootedPath(fs.getRootDirectory(), path));
DirectoryListingValue directoryValue;
try {
directoryValue = (DirectoryListingValue) env.getValueOrThrow(
dirKey, InconsistentFilesystemException.class);
} catch (InconsistentFilesystemException e) {
throw new RepositoryFunctionException(
new IOException(e), SkyFunctionException.Transience.PERSISTENT);
}
if (directoryValue == null) {
return null;
}
// Link x/y/z to /some/path/to/y/z.
if (!symlinkLocalRepositoryContents(outputDirectory, fs.getPath(pathFragment))) {
return null;
}
buildFileHandler.finishBuildFile(outputDirectory);
// If someone specified *new*_local_repository, we can assume they didn't want the existing
// repository info.
Path workspaceFile = outputDirectory.getRelative("WORKSPACE");
if (workspaceFile.exists()) {
try {
workspaceFile.delete();
} catch (IOException e) {
throw new RepositoryFunctionException(e, SkyFunctionException.Transience.TRANSIENT);
}
}
createWorkspaceFile(outputDirectory, rule.getTargetKind(), rule.getName());
return RepositoryDirectoryValue.createWithSourceDirectory(outputDirectory, directoryValue);
}
@Override
public Class<? extends RuleDefinition> getRuleDefinition() {
return NewLocalRepositoryRule.class;
}
}
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