com.google.gerrit.server.edit.ChangeEditUtil Maven / Gradle / Ivy
// Copyright (C) 2014 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.edit;
import static com.google.common.base.Preconditions.checkArgument;
import com.google.gerrit.entities.Change;
import com.google.gerrit.entities.PatchSet;
import com.google.gerrit.entities.RefNames;
import com.google.gerrit.exceptions.StorageException;
import com.google.gerrit.extensions.client.ChangeKind;
import com.google.gerrit.extensions.restapi.AuthException;
import com.google.gerrit.extensions.restapi.ResourceConflictException;
import com.google.gerrit.extensions.restapi.RestApiException;
import com.google.gerrit.git.LockFailureException;
import com.google.gerrit.server.ChangeUtil;
import com.google.gerrit.server.CurrentUser;
import com.google.gerrit.server.IdentifiedUser;
import com.google.gerrit.server.PatchSetUtil;
import com.google.gerrit.server.change.ChangeKindCache;
import com.google.gerrit.server.change.NotifyResolver;
import com.google.gerrit.server.change.PatchSetInserter;
import com.google.gerrit.server.git.GitRepositoryManager;
import com.google.gerrit.server.index.change.ChangeIndexer;
import com.google.gerrit.server.notedb.ChangeNotes;
import com.google.gerrit.server.update.BatchUpdate;
import com.google.gerrit.server.update.BatchUpdateOp;
import com.google.gerrit.server.update.RepoContext;
import com.google.gerrit.server.update.UpdateException;
import com.google.gerrit.server.util.time.TimeUtil;
import com.google.inject.Inject;
import com.google.inject.Provider;
import com.google.inject.Singleton;
import java.io.IOException;
import java.util.Optional;
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.Ref;
import org.eclipse.jgit.lib.RefUpdate;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.revwalk.RevCommit;
import org.eclipse.jgit.revwalk.RevWalk;
/**
* Utility functions to manipulate change edits.
*
* This class contains methods to retrieve, publish and delete edits. For changing edits see
* {@link ChangeEditModifier}.
*/
@Singleton
public class ChangeEditUtil {
private final GitRepositoryManager gitManager;
private final PatchSetInserter.Factory patchSetInserterFactory;
private final ChangeIndexer indexer;
private final Provider userProvider;
private final ChangeKindCache changeKindCache;
private final PatchSetUtil psUtil;
@Inject
ChangeEditUtil(
GitRepositoryManager gitManager,
PatchSetInserter.Factory patchSetInserterFactory,
ChangeIndexer indexer,
Provider userProvider,
ChangeKindCache changeKindCache,
PatchSetUtil psUtil) {
this.gitManager = gitManager;
this.patchSetInserterFactory = patchSetInserterFactory;
this.indexer = indexer;
this.userProvider = userProvider;
this.changeKindCache = changeKindCache;
this.psUtil = psUtil;
}
/**
* Retrieve edit for a given change.
*
* At most one change edit can exist per user and change.
*
* @param notes change notes of change to retrieve change edits for.
* @return edit for this change for this user, if present.
* @throws AuthException if this is not a logged-in user.
* @throws IOException if an error occurs.
*/
public Optional byChange(ChangeNotes notes) throws AuthException, IOException {
return byChange(notes, userProvider.get());
}
/**
* Retrieve edit for a change and the given user.
*
* At most one change edit can exist per user and change.
*
* @param notes change notes of change to retrieve change edits for.
* @param user user to retrieve edits as.
* @return edit for this change for this user, if present.
* @throws AuthException if this is not a logged-in user.
* @throws IOException if an error occurs.
*/
public Optional byChange(ChangeNotes notes, CurrentUser user)
throws AuthException, IOException {
if (!user.isIdentifiedUser()) {
throw new AuthException("Authentication required");
}
IdentifiedUser u = user.asIdentifiedUser();
Change change = notes.getChange();
try (Repository repo = gitManager.openRepository(change.getProject())) {
int n = change.currentPatchSetId().get();
String[] refNames = new String[n];
for (int i = n; i > 0; i--) {
refNames[i - 1] =
RefNames.refsEdit(u.getAccountId(), change.getId(), PatchSet.id(change.getId(), i));
}
Ref ref = repo.getRefDatabase().firstExactRef(refNames);
if (ref == null) {
return Optional.empty();
}
try (RevWalk rw = new RevWalk(repo)) {
RevCommit commit = rw.parseCommit(ref.getObjectId());
PatchSet basePs = getBasePatchSet(notes, ref);
return Optional.of(new ChangeEdit(change, ref.getName(), commit, basePs));
}
}
}
/**
* Promote change edit to patch set, by squashing the edit into its parent.
*
* @param updateFactory factory for creating updates.
* @param notes the {@code ChangeNotes} of the change to which the change edit belongs
* @param user the current user
* @param edit change edit to publish
* @param notify Notify handling that defines to whom email notifications should be sent after the
* change edit is published.
*/
public void publish(
BatchUpdate.Factory updateFactory,
ChangeNotes notes,
CurrentUser user,
ChangeEdit edit,
NotifyResolver.Result notify)
throws IOException, RestApiException, UpdateException {
Change change = edit.getChange();
try (Repository repo = gitManager.openRepository(change.getProject());
ObjectInserter oi = repo.newObjectInserter();
ObjectReader reader = oi.newReader();
RevWalk rw = new RevWalk(reader)) {
PatchSet basePatchSet = edit.getBasePatchSet();
if (!basePatchSet.id().equals(change.currentPatchSetId())) {
throw new ResourceConflictException("only edit for current patch set can be published");
}
RevCommit squashed = squashEdit(rw, oi, edit.getEditCommit(), basePatchSet);
PatchSet.Id psId = ChangeUtil.nextPatchSetId(repo, change.currentPatchSetId());
PatchSetInserter inserter =
patchSetInserterFactory
.create(notes, psId, squashed)
.setSendEmail(!change.isWorkInProgress());
StringBuilder message =
new StringBuilder("Patch Set ").append(inserter.getPatchSetId().get()).append(": ");
// Previously checked that the base patch set is the current patch set.
ObjectId prior = basePatchSet.commitId();
ChangeKind kind =
changeKindCache.getChangeKind(change.getProject(), rw, repo.getConfig(), prior, squashed);
if (kind == ChangeKind.NO_CODE_CHANGE) {
message.append("Commit message was updated.");
inserter.setDescription("Edit commit message");
} else {
message.append("Published edit on patch set ").append(basePatchSet.number()).append(".");
}
try (BatchUpdate bu = updateFactory.create(change.getProject(), user, TimeUtil.now())) {
bu.setRepository(repo, rw, oi);
bu.setNotify(notify);
bu.addOp(change.getId(), inserter.setMessage(message.toString()));
bu.addOp(
change.getId(),
new BatchUpdateOp() {
@Override
public void updateRepo(RepoContext ctx) throws Exception {
ctx.addRefUpdate(edit.getEditCommit().copy(), ObjectId.zeroId(), edit.getRefName());
}
});
bu.execute();
}
}
}
/**
* Delete change edit.
*
* @param edit change edit to delete
*/
public void delete(ChangeEdit edit) throws IOException {
Change change = edit.getChange();
try (Repository repo = gitManager.openRepository(change.getProject())) {
deleteRef(repo, edit);
}
indexer.index(change);
}
private PatchSet getBasePatchSet(ChangeNotes notes, Ref ref) throws IOException {
try {
int pos = ref.getName().lastIndexOf('/');
checkArgument(pos > 0, "invalid edit ref: %s", ref.getName());
String psId = ref.getName().substring(pos + 1);
return psUtil.get(notes, PatchSet.id(notes.getChange().getId(), Integer.parseInt(psId)));
} catch (StorageException | NumberFormatException e) {
throw new IOException(e);
}
}
private RevCommit squashEdit(
RevWalk rw, ObjectInserter inserter, RevCommit edit, PatchSet basePatchSet)
throws IOException, ResourceConflictException {
RevCommit parent = rw.parseCommit(basePatchSet.commitId());
if (parent.getTree().equals(edit.getTree())
&& edit.getFullMessage().equals(parent.getFullMessage())) {
throw new ResourceConflictException("identical tree and message");
}
return writeSquashedCommit(rw, inserter, parent, edit);
}
private static void deleteRef(Repository repo, ChangeEdit edit) throws IOException {
String refName = edit.getRefName();
RefUpdate ru = repo.updateRef(refName, true);
ru.setExpectedOldObjectId(edit.getEditCommit());
ru.setForceUpdate(true);
RefUpdate.Result result = ru.delete();
switch (result) {
case FORCED:
case NEW:
case NO_CHANGE:
break;
case LOCK_FAILURE:
throw new LockFailureException(String.format("Failed to delete ref %s", refName), ru);
case FAST_FORWARD:
case IO_FAILURE:
case NOT_ATTEMPTED:
case REJECTED:
case REJECTED_CURRENT_BRANCH:
case RENAMED:
case REJECTED_MISSING_OBJECT:
case REJECTED_OTHER_REASON:
default:
throw new IOException(String.format("Failed to delete ref %s: %s", refName, result));
}
}
private static RevCommit writeSquashedCommit(
RevWalk rw, ObjectInserter inserter, RevCommit parent, RevCommit edit) throws IOException {
CommitBuilder mergeCommit = new CommitBuilder();
for (int i = 0; i < parent.getParentCount(); i++) {
mergeCommit.addParentId(parent.getParent(i));
}
mergeCommit.setAuthor(parent.getAuthorIdent());
mergeCommit.setMessage(edit.getFullMessage());
mergeCommit.setCommitter(edit.getCommitterIdent());
mergeCommit.setTreeId(edit.getTree());
return rw.parseCommit(commit(inserter, mergeCommit));
}
private static ObjectId commit(ObjectInserter inserter, CommitBuilder mergeCommit)
throws IOException {
ObjectId id = inserter.insert(mergeCommit);
inserter.flush();
return id;
}
}