| // 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.BuildFileName; |
| import com.google.devtools.build.lib.packages.Rule; |
| import com.google.devtools.build.lib.skyframe.FileValue; |
| 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; |
| } |
| } |