private static FileValue createSymbolicLink(Path from, Path to, Environment env)
throws RepositoryFunctionException {
try {
if (!from.exists()) {
from.createSymbolicLink(to);
}
} catch (IOException e) {
throw new RepositoryFunctionException(
new IOException(
String.format(
"Error creating symbolic link from %s to %s: %s", from, to, e.getMessage())),
Transience.TRANSIENT);
}
SkyKey outputDirectoryKey =
FileValue.key(RootedPath.toRootedPath(from, PathFragment.EMPTY_FRAGMENT));
try {
return (FileValue)
env.getValueOrThrow(
outputDirectoryKey,
IOException.class,
FileSymlinkException.class,
InconsistentFilesystemException.class);
} catch (IOException | FileSymlinkException | InconsistentFilesystemException e) {
throw new RepositoryFunctionException(
new IOException(String.format("Could not access %s: %s", from, e.getMessage())),
Transience.PERSISTENT);
}
}
@Override
public SkyValue fetch(Rule rule, Path outputDirectory, Environment env)
throws SkyFunctionException {
AggregatingAttributeMapper mapper = AggregatingAttributeMapper.of(rule);
PathFragment pathFragment = new PathFragment(mapper.get("path", Type.STRING));
try {
FileSystem fs = outputDirectory.getFileSystem();
if (fs.supportsSymbolicLinksNatively()) {
outputDirectory.createSymbolicLink(pathFragment);
} else {
FileSystemUtils.createDirectoryAndParents(outputDirectory);
FileSystemUtils.copyTreesBelow(
fs.getPath(getTargetPath(rule, getWorkspace())), outputDirectory);
}
} catch (IOException e) {
throw new RepositoryFunctionException(
new IOException(
"Could not create symlink to repository " + pathFragment + ": " + e.getMessage()),
Transience.TRANSIENT);
}
FileValue repositoryValue = getRepositoryDirectory(outputDirectory, 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(rule + " must specify an existing directory"), Transience.TRANSIENT);
}
return RepositoryValue.create(outputDirectory);
}
@Override
public void setUp() throws Exception {
super.setUp();
input = scratch.file("input.txt", "Hello, world.");
inputArtifact = getSourceArtifact("input.txt");
Path linkedInput = directories.getExecRoot().getRelative("input.txt");
FileSystemUtils.createDirectoryAndParents(linkedInput.getParentDirectory());
linkedInput.createSymbolicLink(input);
outputArtifact = getBinArtifactWithNoOwner("destination.txt");
output = outputArtifact.getPath();
FileSystemUtils.createDirectoryAndParents(output.getParentDirectory());
action = new SymlinkAction(NULL_ACTION_OWNER, inputArtifact, outputArtifact, "Symlinking test");
}