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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.server.project;
import static org.eclipse.jgit.lib.Constants.R_REFS;
import static org.eclipse.jgit.lib.Constants.R_TAGS;
import com.google.common.collect.Iterables;
import com.google.gerrit.extensions.restapi.BadRequestException;
import com.google.gerrit.reviewdb.client.Project;
import com.google.gerrit.reviewdb.client.RefNames;
import java.io.IOException;
import java.util.Collections;
import org.eclipse.jgit.errors.IncorrectObjectTypeException;
import org.eclipse.jgit.errors.MissingObjectException;
import org.eclipse.jgit.errors.RevisionSyntaxException;
import org.eclipse.jgit.lib.Constants;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.lib.Ref;
import org.eclipse.jgit.lib.RefDatabase;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.revwalk.ObjectWalk;
import org.eclipse.jgit.revwalk.RevWalk;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class RefUtil {
private static final Logger log = LoggerFactory.getLogger(RefUtil.class);
public static ObjectId parseBaseRevision(
Repository repo, Project.NameKey projectName, String baseRevision)
throws InvalidRevisionException {
try {
ObjectId revid = repo.resolve(baseRevision);
if (revid == null) {
throw new InvalidRevisionException();
}
return revid;
} catch (IOException err) {
log.error(
"Cannot resolve \"" + baseRevision + "\" in project \"" + projectName.get() + "\"", err);
throw new InvalidRevisionException();
} catch (RevisionSyntaxException err) {
log.error("Invalid revision syntax \"" + baseRevision + "\"", err);
throw new InvalidRevisionException();
}
}
public static RevWalk verifyConnected(Repository repo, ObjectId revid)
throws InvalidRevisionException {
try {
ObjectWalk rw = new ObjectWalk(repo);
try {
rw.markStart(rw.parseCommit(revid));
} catch (IncorrectObjectTypeException err) {
throw new InvalidRevisionException();
}
RefDatabase refDb = repo.getRefDatabase();
Iterable<Ref> refs =
Iterables.concat(
refDb.getRefs(Constants.R_HEADS).values(), refDb.getRefs(Constants.R_TAGS).values());
Ref rc = refDb.exactRef(RefNames.REFS_CONFIG);
if (rc != null) {
refs = Iterables.concat(refs, Collections.singleton(rc));
}
for (Ref r : refs) {
try {
rw.markUninteresting(rw.parseAny(r.getObjectId()));
} catch (MissingObjectException err) {
continue;
}
}
rw.checkConnectivity();
return rw;
} catch (IncorrectObjectTypeException | MissingObjectException err) {
throw new InvalidRevisionException();
} catch (IOException err) {
log.error(
"Repository \"" + repo.getDirectory() + "\" may be corrupt; suggest running git fsck",
err);
throw new InvalidRevisionException();
}
}
public static String getRefPrefix(String refName) {
int i = refName.lastIndexOf('/');
if (i > Constants.R_HEADS.length() - 1) {
return refName.substring(0, i);
}
return Constants.R_HEADS;
}
public static String normalizeTagRef(String tag) throws BadRequestException {
String result = tag;
while (result.startsWith("/")) {
result = result.substring(1);
}
if (result.startsWith(R_REFS) && !result.startsWith(R_TAGS)) {
throw new BadRequestException("invalid tag name \"" + result + "\"");
}
if (!result.startsWith(R_TAGS)) {
result = R_TAGS + result;
}
if (!Repository.isValidRefName(result)) {
throw new BadRequestException("invalid tag name \"" + result + "\"");
}
return result;
}
/** Error indicating the revision is invalid as supplied. */
static class InvalidRevisionException extends Exception {
private static final long serialVersionUID = 1L;
public static final String MESSAGE = "Invalid Revision";
InvalidRevisionException() {
super(MESSAGE);
}
}
}
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