| // 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); |
| } |
| } |