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com.google.gerrit.server.restapi.change.Rebase Maven / Gradle / Ivy
// Copyright (C) 2013 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.restapi.change;
import static com.google.gerrit.server.project.ProjectCache.illegalState;
import com.google.common.collect.ImmutableListMultimap;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Sets;
import com.google.gerrit.common.Nullable;
import com.google.gerrit.entities.BranchNameKey;
import com.google.gerrit.entities.Change;
import com.google.gerrit.entities.PatchSet;
import com.google.gerrit.extensions.api.changes.RebaseInput;
import com.google.gerrit.extensions.client.ListChangesOption;
import com.google.gerrit.extensions.common.ChangeInfo;
import com.google.gerrit.extensions.restapi.AuthException;
import com.google.gerrit.extensions.restapi.ResourceConflictException;
import com.google.gerrit.extensions.restapi.Response;
import com.google.gerrit.extensions.restapi.RestApiException;
import com.google.gerrit.extensions.restapi.RestModifyView;
import com.google.gerrit.extensions.restapi.UnprocessableEntityException;
import com.google.gerrit.extensions.webui.UiAction;
import com.google.gerrit.server.ChangeUtil;
import com.google.gerrit.server.PatchSetUtil;
import com.google.gerrit.server.change.ChangeJson;
import com.google.gerrit.server.change.ChangeResource;
import com.google.gerrit.server.change.NotifyResolver;
import com.google.gerrit.server.change.RebaseChangeOp;
import com.google.gerrit.server.change.RebaseUtil;
import com.google.gerrit.server.change.RebaseUtil.Base;
import com.google.gerrit.server.change.RevisionResource;
import com.google.gerrit.server.git.CodeReviewCommit;
import com.google.gerrit.server.git.GitRepositoryManager;
import com.google.gerrit.server.permissions.ChangePermission;
import com.google.gerrit.server.permissions.PermissionBackend;
import com.google.gerrit.server.permissions.PermissionBackendException;
import com.google.gerrit.server.project.NoSuchChangeException;
import com.google.gerrit.server.project.ProjectCache;
import com.google.gerrit.server.update.BatchUpdate;
import com.google.gerrit.server.update.UpdateException;
import com.google.gerrit.server.util.time.TimeUtil;
import com.google.inject.Inject;
import com.google.inject.Singleton;
import java.io.IOException;
import java.util.Map;
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.Repository;
import org.eclipse.jgit.revwalk.RevCommit;
import org.eclipse.jgit.revwalk.RevWalk;
@Singleton
public class Rebase
implements RestModifyView, UiAction {
private static final ImmutableSet OPTIONS =
Sets.immutableEnumSet(ListChangesOption.CURRENT_REVISION, ListChangesOption.CURRENT_COMMIT);
private final BatchUpdate.Factory updateFactory;
private final GitRepositoryManager repoManager;
private final RebaseChangeOp.Factory rebaseFactory;
private final RebaseUtil rebaseUtil;
private final ChangeJson.Factory json;
private final PermissionBackend permissionBackend;
private final ProjectCache projectCache;
private final PatchSetUtil patchSetUtil;
@Inject
public Rebase(
BatchUpdate.Factory updateFactory,
GitRepositoryManager repoManager,
RebaseChangeOp.Factory rebaseFactory,
RebaseUtil rebaseUtil,
ChangeJson.Factory json,
PermissionBackend permissionBackend,
ProjectCache projectCache,
PatchSetUtil patchSetUtil) {
this.updateFactory = updateFactory;
this.repoManager = repoManager;
this.rebaseFactory = rebaseFactory;
this.rebaseUtil = rebaseUtil;
this.json = json;
this.permissionBackend = permissionBackend;
this.projectCache = projectCache;
this.patchSetUtil = patchSetUtil;
}
@Override
public Response apply(RevisionResource rsrc, RebaseInput input)
throws UpdateException, RestApiException, IOException, PermissionBackendException {
// Not allowed to rebase if the current patch set is locked.
patchSetUtil.checkPatchSetNotLocked(rsrc.getNotes());
rsrc.permissions().check(ChangePermission.REBASE);
projectCache
.get(rsrc.getProject())
.orElseThrow(illegalState(rsrc.getProject()))
.checkStatePermitsWrite();
Change change = rsrc.getChange();
try (Repository repo = repoManager.openRepository(change.getProject());
ObjectInserter oi = repo.newObjectInserter();
ObjectReader reader = oi.newReader();
RevWalk rw = CodeReviewCommit.newRevWalk(reader);
BatchUpdate bu =
updateFactory.create(change.getProject(), rsrc.getUser(), TimeUtil.now())) {
if (!change.isNew()) {
throw new ResourceConflictException("change is " + ChangeUtil.status(change));
} else if (!hasOneParent(rw, rsrc.getPatchSet())) {
throw new ResourceConflictException(
"cannot rebase merge commits or commit with no ancestor");
}
RebaseChangeOp rebaseOp =
rebaseFactory
.create(rsrc.getNotes(), rsrc.getPatchSet(), findBaseRev(repo, rw, rsrc, input))
.setForceContentMerge(true)
.setAllowConflicts(input.allowConflicts)
.setValidationOptions(getValidateOptionsAsMultimap(input.validationOptions))
.setFireRevisionCreated(true);
// TODO(dborowitz): Why no notification? This seems wrong; dig up blame.
bu.setNotify(NotifyResolver.Result.none());
bu.setRepository(repo, rw, oi);
bu.addOp(change.getId(), rebaseOp);
bu.execute();
ChangeInfo changeInfo = json.create(OPTIONS).format(change.getProject(), change.getId());
changeInfo.containsGitConflicts =
!rebaseOp.getRebasedCommit().getFilesWithGitConflicts().isEmpty() ? true : null;
return Response.ok(changeInfo);
}
}
private ObjectId findBaseRev(
Repository repo, RevWalk rw, RevisionResource rsrc, RebaseInput input)
throws RestApiException, IOException, NoSuchChangeException, AuthException,
PermissionBackendException {
BranchNameKey destRefKey = rsrc.getChange().getDest();
if (input == null || input.base == null) {
return rebaseUtil.findBaseRevision(rsrc.getPatchSet(), destRefKey, repo, rw);
}
Change change = rsrc.getChange();
String str = input.base.trim();
if (str.equals("")) {
// Remove existing dependency to other patch set.
Ref destRef = repo.exactRef(destRefKey.branch());
if (destRef == null) {
throw new ResourceConflictException(
"can't rebase onto tip of branch " + destRefKey.branch() + "; branch doesn't exist");
}
return destRef.getObjectId();
}
Base base;
try {
base = rebaseUtil.parseBase(rsrc, str);
if (base == null) {
throw new ResourceConflictException(
"base revision is missing from the destination branch: " + str);
}
} catch (NoSuchChangeException e) {
throw new UnprocessableEntityException(
String.format("Base change not found: %s", input.base), e);
}
PatchSet.Id baseId = base.patchSet().id();
if (change.getId().equals(baseId.changeId())) {
throw new ResourceConflictException("cannot rebase change onto itself");
}
permissionBackend.user(rsrc.getUser()).change(base.notes()).check(ChangePermission.READ);
Change baseChange = base.notes().getChange();
if (!baseChange.getProject().equals(change.getProject())) {
throw new ResourceConflictException(
"base change is in wrong project: " + baseChange.getProject());
} else if (!baseChange.getDest().equals(change.getDest())) {
throw new ResourceConflictException(
"base change is targeting wrong branch: " + baseChange.getDest());
} else if (baseChange.isAbandoned()) {
throw new ResourceConflictException("base change is abandoned: " + baseChange.getKey());
} else if (isMergedInto(rw, rsrc.getPatchSet(), base.patchSet())) {
throw new ResourceConflictException(
"base change "
+ baseChange.getKey()
+ " is a descendant of the current change - recursion not allowed");
}
return base.patchSet().commitId();
}
private boolean isMergedInto(RevWalk rw, PatchSet base, PatchSet tip) throws IOException {
ObjectId baseId = base.commitId();
ObjectId tipId = tip.commitId();
return rw.isMergedInto(rw.parseCommit(baseId), rw.parseCommit(tipId));
}
private boolean hasOneParent(RevWalk rw, PatchSet ps) throws IOException {
// Prevent rebase of exotic changes (merge commit, no ancestor).
RevCommit c = rw.parseCommit(ps.commitId());
return c.getParentCount() == 1;
}
@Override
public UiAction.Description getDescription(RevisionResource rsrc) throws IOException {
UiAction.Description description =
new UiAction.Description()
.setLabel("Rebase")
.setTitle(
"Rebase onto tip of branch or parent change. Makes you the uploader of this "
+ "change which can affect validity of approvals.")
.setVisible(false);
Change change = rsrc.getChange();
if (!(change.isNew() && rsrc.isCurrent())) {
return description;
}
if (!projectCache
.get(rsrc.getProject())
.orElseThrow(illegalState(rsrc.getProject()))
.statePermitsWrite()) {
return description;
}
if (patchSetUtil.isPatchSetLocked(rsrc.getNotes())) {
return description;
}
boolean enabled = false;
try (Repository repo = repoManager.openRepository(change.getDest().project());
RevWalk rw = new RevWalk(repo)) {
if (hasOneParent(rw, rsrc.getPatchSet())) {
enabled = rebaseUtil.canRebase(rsrc.getPatchSet(), change.getDest(), repo, rw);
}
}
if (rsrc.permissions().testOrFalse(ChangePermission.REBASE)) {
return description.setVisible(true).setEnabled(enabled);
}
return description;
}
private static ImmutableListMultimap getValidateOptionsAsMultimap(
@Nullable Map validationOptions) {
if (validationOptions == null) {
return ImmutableListMultimap.of();
}
ImmutableListMultimap.Builder validationOptionsBuilder =
ImmutableListMultimap.builder();
validationOptions
.entrySet()
.forEach(e -> validationOptionsBuilder.put(e.getKey(), e.getValue()));
return validationOptionsBuilder.build();
}
public static class CurrentRevision implements RestModifyView {
private final PatchSetUtil psUtil;
private final Rebase rebase;
@Inject
CurrentRevision(PatchSetUtil psUtil, Rebase rebase) {
this.psUtil = psUtil;
this.rebase = rebase;
}
@Override
public Response apply(ChangeResource rsrc, RebaseInput input)
throws RestApiException, UpdateException, IOException, PermissionBackendException {
PatchSet ps = psUtil.current(rsrc.getNotes());
if (ps == null) {
throw new ResourceConflictException("current revision is missing");
}
return Response.ok(rebase.apply(new RevisionResource(rsrc, ps), input).value());
}
}
}
