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// Copyright (C) 2016 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.pgm.init.api;
import com.google.gerrit.reviewdb.client.Project;
import com.google.gerrit.server.GerritPersonIdentProvider;
import com.google.gerrit.server.config.SitePaths;
import com.google.gerrit.server.git.meta.VersionedMetaData;
import java.io.File;
import java.io.IOException;
import java.nio.file.Path;
import org.eclipse.jgit.errors.ConfigInvalidException;
import org.eclipse.jgit.internal.storage.file.FileRepository;
import org.eclipse.jgit.lib.CommitBuilder;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.lib.ObjectInserter;
import org.eclipse.jgit.lib.ObjectReader;
import org.eclipse.jgit.lib.PersonIdent;
import org.eclipse.jgit.lib.RefUpdate;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.lib.RepositoryCache.FileKey;
import org.eclipse.jgit.revwalk.RevTree;
import org.eclipse.jgit.revwalk.RevWalk;
import org.eclipse.jgit.util.FS;
public abstract class VersionedMetaDataOnInit extends VersionedMetaData {
protected final String project;
private final InitFlags flags;
private final SitePaths site;
private final String ref;
protected VersionedMetaDataOnInit(InitFlags flags, SitePaths site, String project, String ref) {
this.flags = flags;
this.site = site;
this.project = project;
this.ref = ref;
}
@Override
protected String getRefName() {
return ref;
}
public VersionedMetaDataOnInit load() throws IOException, ConfigInvalidException {
File path = getPath();
if (path != null) {
try (Repository repo = new FileRepository(path)) {
load(new Project.NameKey(project), repo);
}
}
return this;
}
public void save(String message) throws IOException, ConfigInvalidException {
save(new GerritPersonIdentProvider(flags.cfg).get(), message);
}
protected void save(PersonIdent ident, String msg) throws IOException, ConfigInvalidException {
File path = getPath();
if (path == null) {
throw new IOException(project + " does not exist.");
}
try (Repository repo = new FileRepository(path);
ObjectInserter i = repo.newObjectInserter();
ObjectReader r = repo.newObjectReader();
RevWalk rw = new RevWalk(r)) {
inserter = i;
reader = r;
RevTree srcTree = revision != null ? rw.parseTree(revision) : null;
newTree = readTree(srcTree);
CommitBuilder commit = new CommitBuilder();
commit.setAuthor(ident);
commit.setCommitter(ident);
commit.setMessage(msg);
onSave(commit);
ObjectId res = newTree.writeTree(inserter);
if (res.equals(srcTree)) {
return;
}
commit.setTreeId(res);
if (revision != null) {
commit.addParentId(revision);
}
ObjectId newRevision = inserter.insert(commit);
updateRef(repo, ident, newRevision, "commit: " + msg);
revision = rw.parseCommit(newRevision);
} finally {
inserter = null;
reader = null;
}
}
private void updateRef(Repository repo, PersonIdent ident, ObjectId newRevision, String refLogMsg)
throws IOException {
RefUpdate ru = repo.updateRef(getRefName());
ru.setRefLogIdent(ident);
ru.setNewObjectId(newRevision);
ru.setExpectedOldObjectId(revision);
ru.setRefLogMessage(refLogMsg, false);
RefUpdate.Result r = ru.update();
switch (r) {
case FAST_FORWARD:
case NEW:
case NO_CHANGE:
break;
case FORCED:
case IO_FAILURE:
case LOCK_FAILURE:
case NOT_ATTEMPTED:
case REJECTED:
case REJECTED_CURRENT_BRANCH:
case RENAMED:
case REJECTED_MISSING_OBJECT:
case REJECTED_OTHER_REASON:
default:
throw new IOException(
"Failed to update " + getRefName() + " of " + project + ": " + r.name());
}
}
private File getPath() {
Path basePath = site.resolve(flags.cfg.getString("gerrit", null, "basePath"));
if (basePath == null) {
throw new IllegalStateException("gerrit.basePath must be configured");
}
return FileKey.resolve(basePath.resolve(project).toFile(), FS.DETECTED);
}
}