// Copyright (C) 2008 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.server.git;
import com.google.gerrit.extensions.events.LifecycleListener;
import com.google.gerrit.lifecycle.LifecycleModule;
import com.google.gerrit.reviewdb.client.Project;
import com.google.gerrit.server.config.GerritServerConfig;
import com.google.gerrit.server.config.SitePaths;
import com.google.inject.AbstractModule;
import com.google.inject.Inject;
import com.google.inject.Singleton;
import com.jcraft.jsch.Session;
import org.eclipse.jgit.errors.RepositoryNotFoundException;
import org.eclipse.jgit.lib.Config;
import org.eclipse.jgit.lib.ConfigConstants;
import org.eclipse.jgit.lib.Constants;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.lib.RepositoryCache;
import org.eclipse.jgit.lib.RepositoryCache.FileKey;
import org.eclipse.jgit.lib.StoredConfig;
import org.eclipse.jgit.storage.file.LockFile;
import org.eclipse.jgit.storage.file.WindowCache;
import org.eclipse.jgit.storage.file.WindowCacheConfig;
import org.eclipse.jgit.transport.JschConfigSessionFactory;
import org.eclipse.jgit.transport.OpenSshConfig;
import org.eclipse.jgit.transport.SshSessionFactory;
import org.eclipse.jgit.util.FS;
import org.eclipse.jgit.util.IO;
import org.eclipse.jgit.util.RawParseUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.Collections;
import java.util.SortedSet;
import java.util.TreeSet;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
/** Manages Git repositories stored on the local filesystem. */
@Singleton
public class LocalDiskRepositoryManager implements GitRepositoryManager {
private static final Logger log =
LoggerFactory.getLogger(LocalDiskRepositoryManager.class);
private static final String UNNAMED =
"Unnamed repository; edit this file to name it for gitweb.";
public static class Module extends AbstractModule {
@Override
protected void configure() {
bind(GitRepositoryManager.class).to(LocalDiskRepositoryManager.class);
install(new LifecycleModule() {
@Override
protected void configure() {
listener().to(LocalDiskRepositoryManager.Lifecycle.class);
}
});
}
}
public static class Lifecycle implements LifecycleListener {
private final Config cfg;
@Inject
Lifecycle(@GerritServerConfig final Config cfg) {
this.cfg = cfg;
}
@Override
public void start() {
// Install our own factory which always runs in batch mode, as we
// have no UI available for interactive prompting.
SshSessionFactory.setInstance(new JschConfigSessionFactory() {
@Override
protected void configure(OpenSshConfig.Host hc, Session session) {
// Default configuration is batch mode.
}
});
final WindowCacheConfig c = new WindowCacheConfig();
c.fromConfig(cfg);
WindowCache.reconfigure(c);
}
@Override
public void stop() {
}
}
private final File basePath;
private final Lock namesUpdateLock;
private volatile SortedSet<Project.NameKey> names;
@Inject
LocalDiskRepositoryManager(final SitePaths site,
@GerritServerConfig final Config cfg) {
basePath = site.resolve(cfg.getString("gerrit", null, "basePath"));
if (basePath == null) {
throw new IllegalStateException("gerrit.basePath must be configured");
}
namesUpdateLock = new ReentrantLock(true /* fair */);
names = list();
}
/** @return base directory under which all projects are stored. */
public File getBasePath() {
return basePath;
}
private File gitDirOf(Project.NameKey name) {
return new File(getBasePath(), name.get());
}
public Repository openRepository(Project.NameKey name)
throws RepositoryNotFoundException {
if (isUnreasonableName(name)) {
throw new RepositoryNotFoundException("Invalid name: " + name);
}
if (!names.contains(name)) {
throw new RepositoryNotFoundException(gitDirOf(name));
}
final FileKey loc = FileKey.lenient(gitDirOf(name), FS.DETECTED);
try {
return RepositoryCache.open(loc);
} catch (IOException e1) {
final RepositoryNotFoundException e2;
e2 = new RepositoryNotFoundException("Cannot open repository " + name);
e2.initCause(e1);
throw e2;
}
}
public Repository createRepository(final Project.NameKey name)
throws RepositoryNotFoundException, RepositoryCaseMismatchException {
if (isUnreasonableName(name)) {
throw new RepositoryNotFoundException("Invalid name: " + name);
}
File dir = FileKey.resolve(gitDirOf(name), FS.DETECTED);
FileKey loc;
if (dir != null) {
// Already exists on disk, use the repository we found.
//
loc = FileKey.exact(dir, FS.DETECTED);
if (!names.contains(name)) {
throw new RepositoryCaseMismatchException(name);
}
} else {
// It doesn't exist under any of the standard permutations
// of the repository name, so prefer the standard bare name.
//
String n = name.get();
if (!n.endsWith(Constants.DOT_GIT_EXT)) {
n = n + Constants.DOT_GIT_EXT;
}
loc = FileKey.exact(new File(basePath, n), FS.DETECTED);
}
try {
Repository db = RepositoryCache.open(loc, false);
db.create(true /* bare */);
StoredConfig config = db.getConfig();
config.setBoolean(ConfigConstants.CONFIG_CORE_SECTION,
null, ConfigConstants.CONFIG_KEY_LOGALLREFUPDATES, true);
config.save();
onCreateProject(name);
return db;
} catch (IOException e1) {
final RepositoryNotFoundException e2;
e2 = new RepositoryNotFoundException("Cannot create repository " + name);
e2.initCause(e1);
throw e2;
}
}
private void onCreateProject(final Project.NameKey newProjectName) {
namesUpdateLock.lock();
try {
SortedSet<Project.NameKey> n = new TreeSet<Project.NameKey>(names);
n.add(newProjectName);
names = Collections.unmodifiableSortedSet(n);
} finally {
namesUpdateLock.unlock();
}
}
public String getProjectDescription(final Project.NameKey name)
throws RepositoryNotFoundException, IOException {
final Repository e = openRepository(name);
try {
return getProjectDescription(e);
} finally {
e.close();
}
}
private String getProjectDescription(final Repository e) throws IOException {
final File d = new File(e.getDirectory(), "description");
String description;
try {
description = RawParseUtils.decode(IO.readFully(d));
} catch (FileNotFoundException err) {
return null;
}
if (description != null) {
description = description.trim();
if (description.isEmpty()) {
description = null;
}
if (UNNAMED.equals(description)) {
description = null;
}
}
return description;
}
public void setProjectDescription(final Project.NameKey name,
final String description) {
// Update git's description file, in case gitweb is being used
//
try {
final Repository e = openRepository(name);
try {
final String old = getProjectDescription(e);
if ((old == null && description == null)
|| (old != null && old.equals(description))) {
return;
}
final LockFile f = new LockFile(new File(e.getDirectory(), "description"), FS.DETECTED);
if (f.lock()) {
String d = description;
if (d != null) {
d = d.trim();
if (d.length() > 0) {
d += "\n";
}
} else {
d = "";
}
f.write(Constants.encode(d));
f.commit();
}
} finally {
e.close();
}
} catch (RepositoryNotFoundException e) {
log.error("Cannot update description for " + name, e);
} catch (IOException e) {
log.error("Cannot update description for " + name, e);
}
}
private boolean isUnreasonableName(final Project.NameKey nameKey) {
final String name = nameKey.get();
if (name.length() == 0) return true; // no empty paths
if (name.charAt(name.length() -1) == '/') return true; // no suffix
if (name.indexOf('\\') >= 0) return true; // no windows/dos stlye paths
if (name.charAt(0) == '/') return true; // no absolute paths
if (new File(name).isAbsolute()) return true; // no absolute paths
if (name.startsWith("../")) return true; // no "l../etc/passwd"
if (name.contains("/../")) return true; // no "foo/../etc/passwd"
if (name.contains("/./")) return true; // "foo/./foo" is insane to ask
if (name.contains("//")) return true; // windows UNC path can be "//..."
return false; // is a reasonable name
}
@Override
public SortedSet<Project.NameKey> list() {
// The results of this method are cached by ProjectCacheImpl. Control only
// enters here if the cache was flushed by the administrator to force
// scanning the filesystem. Don't rely on the cached names collection.
namesUpdateLock.lock();
try {
SortedSet<Project.NameKey> n = new TreeSet<Project.NameKey>();
scanProjects(basePath, "", n);
names = Collections.unmodifiableSortedSet(n);
return n;
} finally {
namesUpdateLock.unlock();
}
}
private void scanProjects(final File dir, final String prefix,
final SortedSet<Project.NameKey> names) {
final File[] ls = dir.listFiles();
if (ls == null) {
return;
}
for (File f : ls) {
String fileName = f.getName();
if (FileKey.isGitRepository(f, FS.DETECTED)) {
Project.NameKey nameKey = getProjectName(prefix, fileName);
if (isUnreasonableName(nameKey)) {
log.warn("Ignoring unreasonably named repository " + f.getAbsolutePath());
} else {
names.add(nameKey);
}
} else if (f.isDirectory()) {
scanProjects(f, prefix + f.getName() + "/", names);
}
}
}
private Project.NameKey getProjectName(final String prefix,
final String fileName) {
final String projectName;
if (fileName.equals(Constants.DOT_GIT)) {
projectName = prefix.substring(0, prefix.length() - 1);
} else if (fileName.endsWith(Constants.DOT_GIT_EXT)) {
int newLen = fileName.length() - Constants.DOT_GIT_EXT.length();
projectName = prefix + fileName.substring(0, newLen);
} else {
projectName = prefix + fileName;
}
return new Project.NameKey(projectName);
}
}