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// Copyright (C) 2014 The Android Open Source Project
//
// 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.gerrit.common;
import com.google.common.annotations.GwtIncompatible;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.Arrays;
import org.eclipse.jgit.lib.Constants;
import org.eclipse.jgit.storage.file.FileBasedConfig;
import org.eclipse.jgit.util.IO;
@GwtIncompatible("Unemulated classes in java.io, java.nio and JGit")
public class FileUtil {
public static boolean modified(FileBasedConfig cfg) throws IOException {
byte[] curVers;
try {
curVers = IO.readFully(cfg.getFile());
} catch (FileNotFoundException notFound) {
return true;
}
byte[] newVers = Constants.encode(cfg.toText());
return !Arrays.equals(curVers, newVers);
}
public static void mkdir(File path) {
if (!path.isDirectory() && !path.mkdir()) {
throw new Die("Cannot make directory " + path);
}
}
public static void chmod(int mode, Path path) {
// TODO(dborowitz): Is there a portable way to do this with NIO?
chmod(mode, path.toFile());
}
public static void chmod(int mode, File path) {
path.setReadable(false, false /* all */);
path.setWritable(false, false /* all */);
path.setExecutable(false, false /* all */);
path.setReadable((mode & 0400) == 0400, true /* owner only */);
path.setWritable((mode & 0200) == 0200, true /* owner only */);
if (path.isDirectory() || (mode & 0100) == 0100) {
path.setExecutable(true, true /* owner only */);
}
if ((mode & 0044) == 0044) {
path.setReadable(true, false /* all */);
}
if ((mode & 0011) == 0011) {
path.setExecutable(true, false /* all */);
}
}
/**
* Get the last modified time of a path.
*
* <p>Equivalent to {@code File#lastModified()}, returning 0 on errors, including file not found.
* Callers that prefer exceptions can use {@link Files#getLastModifiedTime(Path,
* java.nio.file.LinkOption...)}.
*
* @param p path.
* @return last modified time, in milliseconds since epoch.
*/
public static long lastModified(Path p) {
try {
return Files.getLastModifiedTime(p).toMillis();
} catch (IOException e) {
return 0;
}
}
public static Path mkdirsOrDie(Path p, String errMsg) {
try {
if (!Files.isDirectory(p)) {
Files.createDirectories(p);
}
return p;
} catch (IOException e) {
throw new Die(errMsg + ": " + p, e);
}
}
private FileUtil() {}
}
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