src/main/java/com/google/devtools/build/lib/rules/repository/NewLocalRepositoryFunction.java


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61

// 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.RuleDefinition;
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.skyframe.SkyFunction.Environment;
import com.google.devtools.build.skyframe.SkyFunctionException;
import com.google.devtools.build.skyframe.SkyValue;

/**
 * Create a repository from a directory on the local filesystem.
 */
public class NewLocalRepositoryFunction extends RepositoryFunction {
  @Override
  public boolean isLocal() {
    return true;
  }

  @Override
  public SkyValue fetch(Rule rule, Path outputDirectory, Environment env)
      throws SkyFunctionException {
    FileValue buildFileValue = getBuildFileValue(rule, env);
    if (env.valuesMissing()) {
      return null;
    }
    prepareLocalRepositorySymlinkTree(rule, outputDirectory);
    PathFragment pathFragment = getTargetPath(rule, getWorkspace());
    
    // Link x/y/z to /some/path/to/y/z.
    if (!symlinkLocalRepositoryContents(
        outputDirectory,
        getOutputBase().getFileSystem().getPath(pathFragment),
        env)) {
      return null;
    }

    // Link x/BUILD to <build_root>/x.BUILD.
    return symlinkBuildFile(buildFileValue, outputDirectory);
  }

  @Override
  public Class<? extends RuleDefinition> getRuleDefinition() {
    return NewLocalRepositoryRule.class;
  }
}