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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.actions.FileValue;
import com.google.devtools.build.lib.analysis.BlazeDirectories;
import com.google.devtools.build.lib.analysis.RuleDefinition;
import com.google.devtools.build.lib.packages.BuildFileName;
import com.google.devtools.build.lib.packages.Rule;
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.Transience;
import com.google.devtools.build.skyframe.SkyKey;
import java.io.IOException;
import java.util.Map;
import javax.annotation.Nullable;
/**
* Access a repository on the local filesystem.
*/
public class LocalRepositoryFunction extends RepositoryFunction {
@Override
public boolean isLocal(Rule rule) {
return true;
}
@Override
public RepositoryDirectoryValue.Builder fetch(Rule rule, Path outputDirectory,
BlazeDirectories directories, Environment env, Map<String, String> markerData)
throws InterruptedException, RepositoryFunctionException {
PathFragment pathFragment = RepositoryFunction.getTargetPath(rule, directories.getWorkspace());
return LocalRepositoryFunction.symlink(outputDirectory, pathFragment, env);
}
public static RepositoryDirectoryValue.Builder symlink(
Path source, PathFragment destination, Environment env)
throws RepositoryFunctionException, InterruptedException {
try {
source.createSymbolicLink(destination);
} catch (IOException e) {
throw new RepositoryFunctionException(
new IOException("Could not create symlink to repository " + destination + ": "
+ e.getMessage(), e), Transience.TRANSIENT);
}
FileValue repositoryValue = getRepositoryDirectory(source, env);
if (repositoryValue == null) {
// TODO(bazel-team): If this returns null, we unnecessarily recreate the symlink above on the
// second execution.
return null;
}
if (!repositoryValue.isDirectory()) {
throw new RepositoryFunctionException(
new IOException(source + " must be an existing directory"), Transience.PERSISTENT);
}
// Check that the repository contains a WORKSPACE file.
// It's important to check the real path, otherwise this looks under the "external/[repo]" path
// and cause a Skyframe cycle in the lookup.
FileValue workspaceFileValue = getWorkspaceFile(repositoryValue.realRootedPath(), env);
if (workspaceFileValue == null) {
return null;
}
if (!workspaceFileValue.exists()) {
throw new RepositoryFunctionException(
new IOException("No WORKSPACE file found in " + source), Transience.PERSISTENT);
}
return RepositoryDirectoryValue.builder().setPath(source);
}
@Override
public Class<? extends RuleDefinition> getRuleDefinition() {
return LocalRepositoryRule.class;
}
@Nullable
protected static FileValue getWorkspaceFile(RootedPath directory, Environment env)
throws RepositoryFunctionException, InterruptedException {
RootedPath workspaceRootedFile =
RootedPath.toRootedPath(
directory.getRoot(),
directory
.getRootRelativePath()
.getRelative(BuildFileName.WORKSPACE.getFilenameFragment()));
SkyKey workspaceFileKey = FileValue.key(workspaceRootedFile);
FileValue value;
try {
value = (FileValue) env.getValueOrThrow(workspaceFileKey, IOException.class);
} catch (IOException e) {
throw new RepositoryFunctionException(
new IOException("Could not access " + workspaceRootedFile + ": " + e.getMessage()),
Transience.PERSISTENT);
}
return value;
}
}
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