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// Copyright (C) 2012 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.submit;
import static com.google.common.base.Preconditions.checkState;
import static com.google.common.collect.ImmutableList.toImmutableList;
import static com.google.gerrit.server.submit.CommitMergeStatus.EMPTY_COMMIT;
import static com.google.gerrit.server.submit.CommitMergeStatus.SKIPPED_IDENTICAL_TREE;
import com.google.common.collect.ImmutableList;
import com.google.gerrit.entities.BooleanProjectConfig;
import com.google.gerrit.entities.PatchSet;
import com.google.gerrit.exceptions.StorageException;
import com.google.gerrit.extensions.restapi.BadRequestException;
import com.google.gerrit.extensions.restapi.MergeConflictException;
import com.google.gerrit.extensions.restapi.ResourceConflictException;
import com.google.gerrit.extensions.restapi.RestApiException;
import com.google.gerrit.server.ChangeUtil;
import com.google.gerrit.server.change.RebaseChangeOp;
import com.google.gerrit.server.git.CodeReviewCommit;
import com.google.gerrit.server.git.MergeTip;
import com.google.gerrit.server.permissions.PermissionBackendException;
import com.google.gerrit.server.project.InvalidChangeOperationException;
import com.google.gerrit.server.project.NoSuchChangeException;
import com.google.gerrit.server.update.ChangeContext;
import com.google.gerrit.server.update.PostUpdateContext;
import com.google.gerrit.server.update.RepoContext;
import java.io.IOException;
import java.util.Collection;
import java.util.List;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.lib.PersonIdent;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.revwalk.RevCommit;
/** This strategy covers RebaseAlways and RebaseIfNecessary ones. */
public class RebaseSubmitStrategy extends SubmitStrategy {
private final boolean rebaseAlways;
RebaseSubmitStrategy(SubmitStrategy.Arguments args, boolean rebaseAlways) {
super(args);
this.rebaseAlways = rebaseAlways;
}
@Override
public ImmutableList buildOps(Collection toMerge) {
List sorted;
try {
sorted = args.rebaseSorter.sort(toMerge);
} catch (IOException | StorageException e) {
throw new StorageException("Commit sorting failed", e);
}
// We cannot rebase merge commits. This is why we integrate merge changes into the target branch
// the same way as if MERGE_IF_NECESSARY was the submit strategy. This means if needed we create
// a merge commit that integrates the merge change into the target branch.
// If we integrate a change series that consists out of a normal change and a merge change,
// where the merge change depends on the normal change, we must skip rebasing the normal change,
// because it already gets integrated by merging the merge change. If the rebasing of the normal
// change is not skipped, it would appear twice in the history after the submit is done (once
// through its rebased commit, and once through its original commit which is a parent of the
// merge change that was merged into the target branch. To skip the rebasing of the normal
// change, we call MergeUtil#reduceToMinimalMerge, as it excludes commits which will be
// implicitly integrated by merging the series. Then we use the MergeIfNecessaryOp to integrate
// the whole series.
// If on the other hand, we integrate a change series that consists out of a merge change and a
// normal change, where the normal change depends on the merge change, we can first integrate
// the merge change by a merge and then integrate the normal change by a rebase. In this case we
// do not want to call MergeUtil#reduceToMinimalMerge as we are not intending to integrate the
// whole series by a merge, but rather do the integration of the commits one by one.
boolean foundNonMerge = false;
for (CodeReviewCommit c : sorted) {
if (c.getParentCount() > 1) {
if (!foundNonMerge) {
// found a merge change, but it doesn't depend on a normal change, this means we are not
// required to merge the whole series at once
continue;
}
// found a merge commit that depends on a normal change, this means we are required to merge
// the whole series at once
sorted = args.mergeUtil.reduceToMinimalMerge(args.mergeSorter, sorted);
return sorted.stream().map(n -> new MergeIfNecessaryOp(n)).collect(toImmutableList());
}
foundNonMerge = true;
}
ImmutableList.Builder ops =
ImmutableList.builderWithExpectedSize(sorted.size());
boolean first = true;
while (!sorted.isEmpty()) {
CodeReviewCommit n = sorted.remove(0);
if (first && args.mergeTip.getInitialTip() == null) {
// TODO(tandrii): Cherry-Pick strategy does this too, but it's wrong
// and can be fixed.
ops.add(new FastForwardOp(args, n));
} else if (n.getParentCount() == 0) {
ops.add(new RebaseRootOp(n));
} else if (n.getParentCount() == 1) {
ops.add(new RebaseOneOp(n));
} else {
ops.add(new MergeIfNecessaryOp(n));
}
first = false;
}
return ops.build();
}
private class RebaseRootOp extends SubmitStrategyOp {
private RebaseRootOp(CodeReviewCommit toMerge) {
super(RebaseSubmitStrategy.this.args, toMerge);
}
@Override
public void updateRepoImpl(RepoContext ctx) {
// Refuse to merge a root commit into an existing branch, we cannot obtain
// a delta for the cherry-pick to apply.
toMerge.setStatusCode(CommitMergeStatus.CANNOT_REBASE_ROOT);
}
}
private class RebaseOneOp extends SubmitStrategyOp {
private RebaseChangeOp rebaseOp;
private CodeReviewCommit newCommit;
private PatchSet.Id newPatchSetId;
private RebaseOneOp(CodeReviewCommit toMerge) {
super(RebaseSubmitStrategy.this.args, toMerge);
}
@Override
public void updateRepoImpl(RepoContext ctx)
throws InvalidChangeOperationException, RestApiException, IOException,
PermissionBackendException {
if (args.mergeUtil.canFastForward(
args.mergeSorter, args.mergeTip.getCurrentTip(), args.rw, toMerge)) {
if (!rebaseAlways) {
if (args.project.is(BooleanProjectConfig.REJECT_EMPTY_COMMIT)
&& toMerge.getTree().equals(toMerge.getParent(0).getTree())) {
toMerge.setStatusCode(EMPTY_COMMIT);
return;
}
args.mergeTip.moveTipTo(amendGitlink(toMerge), toMerge);
toMerge.setStatusCode(CommitMergeStatus.CLEAN_MERGE);
acceptMergeTip(args.mergeTip);
return;
}
// RebaseAlways means we modify commit message.
args.rw.parseBody(toMerge);
newPatchSetId =
ChangeUtil.nextPatchSetIdFromChangeRefs(
ctx.getRepoView().getRefs(getId().toRefPrefix()).keySet(),
toMerge.change().currentPatchSetId());
RevCommit mergeTip = args.mergeTip.getCurrentTip();
args.rw.parseBody(mergeTip);
String cherryPickCmtMsg = args.mergeUtil.createCommitMessageOnSubmit(toMerge, mergeTip);
PersonIdent committer = ctx.newCommitterIdent(args.caller);
try {
newCommit =
args.mergeUtil.createCherryPickFromCommit(
ctx.getInserter(),
ctx.getRepoView().getConfig(),
args.mergeTip.getCurrentTip(),
toMerge,
committer,
cherryPickCmtMsg,
args.rw,
0,
true,
false);
} catch (MergeConflictException mce) {
// Unlike in Cherry-pick case, this should never happen.
toMerge.setStatusCode(CommitMergeStatus.REBASE_MERGE_CONFLICT);
throw new IllegalStateException(
"MergeConflictException on message edit must not happen", mce);
} catch (MergeIdenticalTreeException mie) {
// this should not happen
toMerge.setStatusCode(SKIPPED_IDENTICAL_TREE);
return;
}
ctx.addRefUpdate(ObjectId.zeroId(), newCommit, newPatchSetId.toRefName());
} else {
// Stale read of patch set is ok; see comments in RebaseChangeOp.
PatchSet origPs = args.psUtil.get(toMerge.getNotes(), toMerge.getPatchsetId());
rebaseOp =
args.rebaseFactory
.create(toMerge.notes(), origPs, args.mergeTip.getCurrentTip())
.setFireRevisionCreated(false)
// Bypass approval copier since SubmitStrategyOp copy all approvals
// later anyway.
.setValidate(false)
.setCheckAddPatchSetPermission(false)
// RebaseAlways should set always modify commit message like
// Cherry-Pick strategy.
.setDetailedCommitMessage(rebaseAlways)
// Do not post message after inserting new patchset because there
// will be one about change being merged already.
.setPostMessage(false)
.setSendEmail(false)
.setMatchAuthorToCommitterDate(
args.project.is(BooleanProjectConfig.MATCH_AUTHOR_TO_COMMITTER_DATE))
// The votes are automatically copied and they don't count as copied votes. See
// method's javadoc.
.setStoreCopiedVotes(/* storeCopiedVotes = */ false);
try {
rebaseOp.updateRepo(ctx);
} catch (MergeConflictException | NoSuchChangeException e) {
toMerge.setStatusCode(CommitMergeStatus.REBASE_MERGE_CONFLICT);
throw new IntegrationConflictException(
"Cannot rebase " + toMerge.name() + ": " + e.getMessage(), e);
}
newCommit = args.rw.parseCommit(rebaseOp.getRebasedCommit());
newPatchSetId = rebaseOp.getPatchSetId();
}
if (args.project.is(BooleanProjectConfig.REJECT_EMPTY_COMMIT)
&& newCommit.getTree().equals(newCommit.getParent(0).getTree())) {
toMerge.setStatusCode(EMPTY_COMMIT);
return;
}
newCommit = amendGitlink(newCommit);
newCommit.copyFrom(toMerge);
newCommit.setPatchsetId(newPatchSetId);
newCommit.setStatusCode(CommitMergeStatus.CLEAN_REBASE);
args.mergeTip.moveTipTo(newCommit, newCommit);
args.commitStatus.put(args.mergeTip.getCurrentTip());
acceptMergeTip(args.mergeTip);
}
@Override
public PatchSet updateChangeImpl(ChangeContext ctx)
throws NoSuchChangeException, ResourceConflictException, IOException, BadRequestException {
if (newCommit == null) {
checkState(!rebaseAlways, "RebaseAlways must never fast forward");
// otherwise, took the fast-forward option, nothing to do.
return null;
}
PatchSet newPs;
if (rebaseOp != null) {
rebaseOp.updateChange(ctx);
newPs = rebaseOp.getPatchSet();
} else {
// CherryPick
PatchSet prevPs = args.psUtil.current(ctx.getNotes());
newPs =
args.psUtil.insert(
ctx.getRevWalk(),
ctx.getUpdate(newPatchSetId),
newPatchSetId,
newCommit,
prevPs != null ? prevPs.groups() : ImmutableList.of(),
null,
null);
}
ctx.getChange()
.setCurrentPatchSet(
args.patchSetInfoFactory.get(ctx.getRevWalk(), newCommit, newPatchSetId));
newCommit.setNotes(ctx.getNotes());
return newPs;
}
@Override
public void postUpdateImpl(PostUpdateContext ctx) {
if (rebaseOp != null) {
rebaseOp.postUpdate(ctx);
}
}
}
private class MergeIfNecessaryOp extends SubmitStrategyOp {
private MergeIfNecessaryOp(CodeReviewCommit toMerge) {
super(RebaseSubmitStrategy.this.args, toMerge);
}
@Override
public void updateRepoImpl(RepoContext ctx) throws IntegrationConflictException, IOException {
// There are multiple parents, so this is a merge commit. We don't want
// to rebase the merge as clients can't easily rebase their history with
// that merge present and replaced by an equivalent merge with a different
// first parent. So instead behave as though MERGE_IF_NECESSARY was
// configured.
// TODO(tandrii): this is not in spirit of RebaseAlways strategy because
// the commit messages can not be modified in the process. It's also
// possible to implement rebasing of merge commits. E.g., the Cherry Pick
// REST endpoint already supports cherry-picking of merge commits.
// For now, users of RebaseAlways strategy for whom changed commit footers
// are important would be well advised to prohibit uploading patches with
// merge commits.
MergeTip mergeTip = args.mergeTip;
if (args.rw.isMergedInto(mergeTip.getCurrentTip(), toMerge)
&& !args.subscriptionGraph.hasSubscription(args.destBranch)) {
mergeTip.moveTipTo(toMerge, toMerge);
} else {
PersonIdent caller = ctx.newCommitterIdent();
CodeReviewCommit newTip =
args.mergeUtil.mergeOneCommit(
caller,
caller,
args.rw,
ctx.getInserter(),
ctx.getRepoView().getConfig(),
args.destBranch,
mergeTip.getCurrentTip(),
toMerge);
mergeTip.moveTipTo(amendGitlink(newTip), toMerge);
}
args.mergeUtil.markCleanMerges(
args.rw, args.canMergeFlag, mergeTip.getCurrentTip(), args.alreadyAccepted);
acceptMergeTip(mergeTip);
}
}
private void acceptMergeTip(MergeTip mergeTip) {
args.alreadyAccepted.add(mergeTip.getCurrentTip());
}
static boolean dryRun(
SubmitDryRun.Arguments args,
Repository repo,
CodeReviewCommit mergeTip,
CodeReviewCommit toMerge) {
// Test for merge instead of cherry pick to avoid false negatives
// on commit chains.
return args.mergeUtil.canMerge(args.mergeSorter, repo, mergeTip, toMerge);
}
}
