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com.google.gerrit.server.git.LocalDiskRepositoryManager Maven / Gradle / Ivy
// 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.common.flogger.FluentLogger;
import com.google.gerrit.entities.Project;
import com.google.gerrit.entities.Project.NameKey;
import com.google.gerrit.entities.RefNames;
import com.google.gerrit.extensions.events.LifecycleListener;
import com.google.gerrit.lifecycle.LifecycleModule;
import com.google.gerrit.server.cache.PerThreadRefDbCache;
import com.google.gerrit.server.config.GerritServerConfig;
import com.google.gerrit.server.config.SitePaths;
import com.google.inject.Inject;
import com.google.inject.Singleton;
import java.io.File;
import java.io.IOException;
import java.nio.file.FileVisitOption;
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.util.Collections;
import java.util.EnumSet;
import java.util.Map;
import java.util.NavigableSet;
import java.util.TreeSet;
import java.util.concurrent.ConcurrentHashMap;
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.RepositoryCacheConfig;
import org.eclipse.jgit.lib.StoredConfig;
import org.eclipse.jgit.storage.file.WindowCacheConfig;
import org.eclipse.jgit.util.FS;
/** Manages Git repositories stored on the local filesystem. */
@Singleton
public class LocalDiskRepositoryManager implements GitRepositoryManager {
private static final FluentLogger logger = FluentLogger.forEnclosingClass();
public static class LocalDiskRepositoryManagerModule extends LifecycleModule {
@Override
protected void configure() {
listener().to(LocalDiskRepositoryManager.Lifecycle.class);
}
}
public static class Lifecycle implements LifecycleListener {
private final Config serverConfig;
@Inject
Lifecycle(@GerritServerConfig Config cfg) {
this.serverConfig = cfg;
}
@Override
public void start() {
RepositoryCacheConfig repoCacheCfg = new RepositoryCacheConfig();
repoCacheCfg.fromConfig(serverConfig);
repoCacheCfg.install();
WindowCacheConfig cfg = new WindowCacheConfig();
cfg.fromConfig(serverConfig);
if (serverConfig.getString("core", null, "streamFileThreshold") == null) {
long mx = Runtime.getRuntime().maxMemory();
int limit =
(int)
Math.min(
mx / 4, // don't use more than 1/4 of the heap.
2047 << 20); // cannot exceed array length
if ((5 << 20) < limit && limit % (1 << 20) != 0) {
// If the limit is at least 5 MiB but is not a whole multiple
// of MiB round up to the next one full megabyte. This is a very
// tiny memory increase in exchange for nice round units.
limit = ((limit / (1 << 20)) + 1) << 20;
}
String desc;
if (limit % (1 << 20) == 0) {
desc = String.format("%dm", limit / (1 << 20));
} else if (limit % (1 << 10) == 0) {
desc = String.format("%dk", limit / (1 << 10));
} else {
desc = String.format("%d", limit);
}
logger.atInfo().log("Defaulting core.streamFileThreshold to %s", desc);
cfg.setStreamFileThreshold(limit);
}
cfg.install();
}
@Override
public void stop() {}
}
private final Path basePath;
private final Map fileKeyByProject = new ConcurrentHashMap<>();
private final boolean usePerRequestRefCache;
@Inject
LocalDiskRepositoryManager(SitePaths site, @GerritServerConfig Config cfg) {
basePath = site.resolve(cfg.getString("gerrit", null, "basePath"));
if (basePath == null) {
throw new IllegalStateException("gerrit.basePath must be configured");
}
usePerRequestRefCache = cfg.getBoolean("core", null, "usePerRequestRefCache", true);
}
/**
* Return the basePath under which the specified project is stored.
*
* @param name the name of the project
* @return base directory
*/
public Path getBasePath(Project.NameKey name) {
return basePath;
}
@Override
public Status getRepositoryStatus(NameKey name) {
if (isUnreasonableName(name)) {
return Status.NON_EXISTENT;
}
Path path = getBasePath(name);
File dir = FileKey.resolve(path.resolve(name.get()).toFile(), FS.DETECTED);
if (dir == null) {
return Status.NON_EXISTENT;
}
Repository repo;
try {
// Try to open with mustExist, so that it does not attempt to create a repository.
repo = RepositoryCache.open(FileKey.lenient(dir, FS.DETECTED), /*mustExist=*/ true);
} catch (RepositoryNotFoundException e) {
return Status.NON_EXISTENT;
} catch (IOException e) {
return Status.UNAVAILABLE;
}
// If object database does not exist, the repository is unusable
return repo.getObjectDatabase().exists() ? Status.ACTIVE : Status.UNAVAILABLE;
}
@Override
public Repository openRepository(Project.NameKey name) throws RepositoryNotFoundException {
FileKey cachedLocation = fileKeyByProject.get(name);
if (cachedLocation != null) {
try {
return RepositoryCache.open(cachedLocation);
} catch (IOException e) {
fileKeyByProject.remove(name, cachedLocation);
}
}
if (isUnreasonableName(name)) {
throw new RepositoryNotFoundException("Invalid name: " + name);
}
FileKey location =
usePerRequestRefCache
? DynamicRefDbRepository.FileKey.lenient(
getBasePath(name).resolve(name.get()).toFile(),
FS.DETECTED,
(path, refDb) -> PerThreadRefDbCache.getRefDatabase(path, refDb))
: FileKey.lenient(getBasePath(name).resolve(name.get()).toFile(), FS.DETECTED);
try {
Repository repo = RepositoryCache.open(location);
fileKeyByProject.put(name, location);
return repo;
} catch (IOException e) {
throw new RepositoryNotFoundException("Cannot open repository " + name, e);
}
}
@Override
public Repository createRepository(Project.NameKey name)
throws RepositoryNotFoundException, RepositoryExistsException, IOException {
if (isUnreasonableName(name)) {
throw new RepositoryNotFoundException("Invalid name: " + name);
}
Path path = getBasePath(name);
File dir = FileKey.resolve(path.resolve(name.get()).toFile(), FS.DETECTED);
if (dir != null) {
// Already exists on disk, use the repository we found.
//
Project.NameKey onDiskName = getProjectName(path, dir.getCanonicalFile().toPath());
if (!onDiskName.equals(name)) {
throw new RepositoryCaseMismatchException(name);
}
throw new RepositoryExistsException(name);
}
// It doesn't exist under any of the standard permutations
// of the repository name, so prefer the standard bare name.
//
String n = name.get() + Constants.DOT_GIT_EXT;
FileKey loc = FileKey.exact(path.resolve(n).toFile(), 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();
// JGit only writes to the reflog for refs/meta/config if the log file
// already exists.
//
File metaConfigLog = new File(db.getDirectory(), "logs/" + RefNames.REFS_CONFIG);
if (!metaConfigLog.getParentFile().mkdirs() || !metaConfigLog.createNewFile()) {
logger.atSevere().log(
"Failed to create ref log for %s in repository %s", RefNames.REFS_CONFIG, name);
}
return db;
} catch (IOException e) {
throw new RepositoryNotFoundException("Cannot create repository " + name, e);
}
}
@Override
public Boolean canPerformGC() {
return true;
}
private boolean isUnreasonableName(Project.NameKey nameKey) {
final String name = nameKey.get();
return name.length() == 0 // no empty paths
|| name.charAt(name.length() - 1) == '/' // no suffix
|| name.indexOf('\\') >= 0 // no windows/dos style paths
|| name.charAt(0) == '/' // no absolute paths
|| new File(name).isAbsolute() // no absolute paths
|| name.startsWith("../") // no "l../etc/passwd"
|| name.contains("/../") // no "foo/../etc/passwd"
|| name.contains("/./") // "foo/./foo" is insane to ask
|| name.contains("//") // windows UNC path can be "//..."
|| name.contains(".git/") // no path segments that end with '.git' as "foo.git/bar"
|| name.contains("?") // common unix wildcard
|| name.contains("%") // wildcard or string parameter
|| name.contains("*") // wildcard
|| name.contains(":") // Could be used for absolute paths in windows?
|| name.contains("<") // redirect input
|| name.contains(">") // redirect output
|| name.contains("|") // pipe
|| name.contains("$") // dollar sign
|| name.contains("\r") // carriage return
|| name.contains("/+") // delimiter in /changes/
|| name.contains("~"); // delimiter in /changes/
}
@Override
public NavigableSet list() {
ProjectVisitor visitor = new ProjectVisitor(basePath);
scanProjects(visitor);
return Collections.unmodifiableNavigableSet(visitor.found);
}
protected void scanProjects(ProjectVisitor visitor) {
try {
Files.walkFileTree(
visitor.startFolder,
EnumSet.of(FileVisitOption.FOLLOW_LINKS),
Integer.MAX_VALUE,
visitor);
} catch (IOException e) {
logger.atSevere().withCause(e).log(
"Error walking repository tree %s", visitor.startFolder.toAbsolutePath());
}
}
private static Project.NameKey getProjectName(Path startFolder, Path p) {
String projectName = startFolder.relativize(p).toString();
if (File.separatorChar != '/') {
projectName = projectName.replace(File.separatorChar, '/');
}
if (projectName.endsWith(Constants.DOT_GIT_EXT)) {
int newLen = projectName.length() - Constants.DOT_GIT_EXT.length();
projectName = projectName.substring(0, newLen);
}
return Project.nameKey(projectName);
}
protected class ProjectVisitor extends SimpleFileVisitor {
private final NavigableSet found = new TreeSet<>();
private Path startFolder;
public ProjectVisitor(Path startFolder) {
setStartFolder(startFolder);
}
public void setStartFolder(Path startFolder) {
this.startFolder = startFolder;
}
@Override
public FileVisitResult preVisitDirectory(Path dir, BasicFileAttributes attrs)
throws IOException {
if (!dir.equals(startFolder) && isRepo(dir)) {
addProject(dir);
return FileVisitResult.SKIP_SUBTREE;
}
return FileVisitResult.CONTINUE;
}
@Override
public FileVisitResult visitFileFailed(Path file, IOException e) {
logger.atWarning().log("%s", e.getMessage());
return FileVisitResult.CONTINUE;
}
private boolean isRepo(Path p) {
String name = p.getFileName().toString();
return !name.equals(Constants.DOT_GIT)
&& (name.endsWith(Constants.DOT_GIT_EXT)
|| FileKey.isGitRepository(p.toFile(), FS.DETECTED));
}
private void addProject(Path p) {
Project.NameKey nameKey = getProjectName(startFolder, p);
if (getBasePath(nameKey).equals(startFolder)) {
if (isUnreasonableName(nameKey)) {
logger.atWarning().log("Ignoring unreasonably named repository %s", p.toAbsolutePath());
} else {
found.add(nameKey);
}
}
}
}
}
