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// Copyright 2016 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.android;
import static java.nio.file.attribute.PosixFilePermission.OWNER_EXECUTE;
import static java.nio.file.attribute.PosixFilePermission.OWNER_READ;
import static java.nio.file.attribute.PosixFilePermission.OWNER_WRITE;
import java.io.Closeable;
import java.io.IOException;
import java.nio.file.FileStore;
import java.nio.file.FileVisitResult;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.SimpleFileVisitor;
import java.nio.file.attribute.BasicFileAttributes;
import java.nio.file.attribute.DosFileAttributeView;
import java.nio.file.attribute.PosixFileAttributeView;
import java.util.EnumSet;
/**
* Creates a temporary directory that will be deleted once a scope closes. NOTE: If an error occurs
* during deletion, it will just stop rather than try and continue.
*/
final class ScopedTemporaryDirectory extends SimpleFileVisitor<Path> implements Closeable {
private static final boolean IS_WINDOWS = System.getProperty("os.name").startsWith("Windows");
private final Path path;
public ScopedTemporaryDirectory(String prefix) throws IOException {
this.path = Files.createTempDirectory(prefix);
}
public Path getPath() {
return this.path;
}
public Path subDirectoryOf(String... directories) throws IOException {
Path sub = this.path;
for (String directory : directories) {
sub = sub.resolve(directory);
}
return Files.createDirectories(sub);
}
private void makeWritable(Path file) throws IOException {
FileStore fileStore = Files.getFileStore(file);
if (IS_WINDOWS && fileStore.supportsFileAttributeView(DosFileAttributeView.class)) {
DosFileAttributeView dosAttribs =
Files.getFileAttributeView(file, DosFileAttributeView.class);
if (dosAttribs != null) {
dosAttribs.setReadOnly(false);
}
} else if (fileStore.supportsFileAttributeView(PosixFileAttributeView.class)) {
PosixFileAttributeView posixAttribs =
Files.getFileAttributeView(file, PosixFileAttributeView.class);
if (posixAttribs != null) {
posixAttribs.setPermissions(EnumSet.of(OWNER_READ, OWNER_WRITE, OWNER_EXECUTE));
}
}
}
@Override
public FileVisitResult preVisitDirectory(Path dir, BasicFileAttributes attrs) throws IOException {
if (IS_WINDOWS) {
makeWritable(dir);
}
return FileVisitResult.CONTINUE;
}
@Override
public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException {
if (IS_WINDOWS) {
makeWritable(file);
}
Files.delete(file);
return FileVisitResult.CONTINUE;
}
@Override
public FileVisitResult postVisitDirectory(Path dir, IOException exc) throws IOException {
Files.delete(dir);
return FileVisitResult.CONTINUE;
}
@Override
public void close() throws IOException {
Files.walkFileTree(path, this);
}
}
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