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// Copyright 2015 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.bazel.repository;
import com.google.common.base.Optional;
import com.google.devtools.build.lib.bazel.repository.DecompressorValue.Decompressor;
import com.google.devtools.build.lib.rules.repository.RepositoryFunction.RepositoryFunctionException;
import com.google.devtools.build.lib.util.OS;
import com.google.devtools.build.lib.vfs.FileSystemUtils;
import com.google.devtools.build.lib.vfs.Path;
import com.google.devtools.build.lib.vfs.PathFragment;
import com.google.devtools.build.skyframe.SkyFunctionException.Transience;
import java.io.IOException;
import java.io.InputStream;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.nio.file.StandardCopyOption;
import java.util.Date;
import org.apache.commons.compress.archivers.tar.TarArchiveEntry;
import org.apache.commons.compress.archivers.tar.TarArchiveInputStream;
/**
* Common code for unarchiving a compressed TAR file.
*/
public abstract class CompressedTarFunction implements Decompressor {
protected abstract InputStream getDecompressorStream(DecompressorDescriptor descriptor)
throws IOException;
@Override
public Path decompress(DecompressorDescriptor descriptor) throws RepositoryFunctionException {
Optional<String> prefix = descriptor.prefix();
boolean foundPrefix = false;
try (InputStream decompressorStream = getDecompressorStream(descriptor)) {
TarArchiveInputStream tarStream = new TarArchiveInputStream(decompressorStream);
TarArchiveEntry entry;
while ((entry = tarStream.getNextTarEntry()) != null) {
StripPrefixedPath entryPath = StripPrefixedPath.maybeDeprefix(entry.getName(), prefix);
foundPrefix = foundPrefix || entryPath.foundPrefix();
if (entryPath.skip()) {
continue;
}
Path filename = descriptor.repositoryPath().getRelative(entryPath.getPathFragment());
FileSystemUtils.createDirectoryAndParents(filename.getParentDirectory());
if (entry.isDirectory()) {
FileSystemUtils.createDirectoryAndParents(filename);
} else {
if (entry.isSymbolicLink() || entry.isLink()) {
PathFragment linkName = PathFragment.create(entry.getLinkName());
boolean wasAbsolute = linkName.isAbsolute();
// Strip the prefix from the link path if set.
linkName =
StripPrefixedPath.maybeDeprefix(linkName.getPathString(), prefix).getPathFragment();
if (wasAbsolute) {
// Recover the path to an absolute path as maybeDeprefix() relativize the path
// even if the prefix is not set
linkName = descriptor.repositoryPath().getRelative(linkName).asFragment();
}
if (filename.exists()) {
filename.delete();
}
if (entry.isSymbolicLink()) {
FileSystemUtils.ensureSymbolicLink(filename, linkName);
} else {
FileSystemUtils.createHardLink(
filename, descriptor.repositoryPath().getRelative(linkName));
}
} else {
if (OS.getCurrent() == OS.DARWIN) {
// On Darwin, Files interprets file names as utf8, regardless of the standard
// encoding, so we have to create a unicode string that, when ecoded utf-8 gives
// the same octets back; in this way, we can have Files.copy to behave consistent
// with the file name interpretation of com.google.devtools.build.lib.vfs.
String filenameForFiles =
new String(
filename.getPathFile().toPath().toString().getBytes("ISO-8859-1"), "UTF-8");
Files.copy(
tarStream, Paths.get(filenameForFiles), StandardCopyOption.REPLACE_EXISTING);
} else {
Files.copy(
tarStream, filename.getPathFile().toPath(), StandardCopyOption.REPLACE_EXISTING);
}
filename.chmod(entry.getMode());
// This can only be done on real files, not links, or it will skip the reader to
// the next "real" file to try to find the mod time info.
Date lastModified = entry.getLastModifiedDate();
filename.setLastModifiedTime(lastModified.getTime());
}
}
}
} catch (IOException e) {
throw new RepositoryFunctionException(e, Transience.TRANSIENT);
}
if (prefix.isPresent() && !foundPrefix) {
throw new RepositoryFunctionException(
new IOException("Prefix " + prefix.get() + " was given, but not found in the archive"),
Transience.PERSISTENT);
}
return descriptor.repositoryPath();
}
}
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