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/*
* Copyright (C) 2009, Google Inc. and others
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Distribution License v. 1.0 which is available at
* https://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
package org.eclipse.jgit.internal.storage.file;
import java.io.File;
import java.io.IOException;
import org.eclipse.jgit.lib.Constants;
import org.eclipse.jgit.util.FS;
import org.eclipse.jgit.util.FileUtils;
/**
* Keeps track of a {@link org.eclipse.jgit.internal.storage.file.PackFile}'s
* associated <code>.keep</code> file.
*/
public class PackLock {
private final File keepFile;
/**
* Create a new lock for a pack file.
*
* @param packFile
* location of the <code>pack-*.pack</code> file.
* @param fs
* the filesystem abstraction used by the repository.
*/
public PackLock(File packFile, FS fs) {
final File p = packFile.getParentFile();
final String n = packFile.getName();
keepFile = new File(p, n.substring(0, n.length() - 5) + ".keep"); //$NON-NLS-1$
}
/**
* Create the <code>pack-*.keep</code> file, with the given message.
*
* @param msg
* message to store in the file.
* @return true if the keep file was successfully written; false otherwise.
* @throws java.io.IOException
* the keep file could not be written.
*/
public boolean lock(String msg) throws IOException {
if (msg == null)
return false;
if (!msg.endsWith("\n")) //$NON-NLS-1$
msg += "\n"; //$NON-NLS-1$
final LockFile lf = new LockFile(keepFile);
if (!lf.lock())
return false;
lf.write(Constants.encode(msg));
return lf.commit();
}
/**
* Remove the <code>.keep</code> file that holds this pack in place.
*
* @throws java.io.IOException
* if deletion of .keep file failed
*/
public void unlock() throws IOException {
FileUtils.delete(keepFile);
}
}
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