Merge "Reject submitting change if its destination branch does not exist"

gerrit-httpd/src/main/java/com/google/gerrit/httpd/rpc/changedetail/ChangeDetailFactory.java

@@ -152,7 +152,8 @@ public class ChangeDetailFactory extends Handler<ChangeDetail> {
       }
       if (detail.getChange().getStatus().isOpen()
           && rec.status == SubmitRecord.Status.OK
-          && control.getRefControl().canSubmit()) {
+          && control.getRefControl().canSubmit()
+          && ProjectUtil.branchExists(repoManager, change.getDest())) {
         detail.setCanSubmit(true);
       }
     }

gerrit-server/src/main/java/com/google/gerrit/server/changedetail/Submit.java

@@ -24,6 +24,8 @@ import com.google.gerrit.reviewdb.client.PatchSetApproval;
 import com.google.gerrit.reviewdb.server.ReviewDb;
 import com.google.gerrit.server.ChangeUtil;
 import com.google.gerrit.server.IdentifiedUser;
+import com.google.gerrit.server.ProjectUtil;
+import com.google.gerrit.server.git.GitRepositoryManager;
 import com.google.gerrit.server.git.MergeOp;
 import com.google.gerrit.server.git.MergeQueue;
 import com.google.gerrit.server.project.ChangeControl;
@@ -34,6 +36,7 @@ import com.google.gwtorm.server.OrmException;
 import com.google.inject.Inject;
 import com.google.inject.assistedinject.Assisted;
 
+import java.io.IOException;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
@@ -49,6 +52,7 @@ public class Submit implements Callable<ReviewResult> {
   private final MergeOp.Factory opFactory;
   private final MergeQueue merger;
   private final ReviewDb db;
+  private final GitRepositoryManager repoManager;
   private final IdentifiedUser currentUser;
 
   private final PatchSet.Id patchSetId;
@@ -56,12 +60,13 @@ public class Submit implements Callable<ReviewResult> {
   @Inject
   Submit(final ChangeControl.Factory changeControlFactory,
       final MergeOp.Factory opFactory, final MergeQueue merger,
-      final ReviewDb db, final IdentifiedUser currentUser,
-      @Assisted final PatchSet.Id patchSetId) {
+      final ReviewDb db, final GitRepositoryManager repoManager,
+      final IdentifiedUser currentUser, @Assisted final PatchSet.Id patchSetId) {
     this.changeControlFactory = changeControlFactory;
     this.opFactory = opFactory;
     this.merger = merger;
     this.db = db;
+    this.repoManager = repoManager;
     this.currentUser = currentUser;
 
     this.patchSetId = patchSetId;
@@ -69,7 +74,8 @@ public class Submit implements Callable<ReviewResult> {
 
   @Override
   public ReviewResult call() throws IllegalStateException,
-      InvalidChangeOperationException, NoSuchChangeException, OrmException {
+      InvalidChangeOperationException, NoSuchChangeException, OrmException,
+      IOException {
     final ReviewResult result = new ReviewResult();
 
     final PatchSet patch = db.patchSets().get(patchSetId);
@@ -151,6 +157,14 @@ public class Submit implements Callable<ReviewResult> {
       }
     }
 
+    if (!ProjectUtil.branchExists(repoManager, control.getChange().getDest())) {
+      result.addError(new ReviewResult.Error(
+          ReviewResult.Error.Type.DEST_BRANCH_NOT_FOUND,
+          "Destination branch \"" + control.getChange().getDest().get()
+              + "\" not found."));
+      return result;
+    }
+
     // Submit the change if we can
     if (result.getErrors().isEmpty()) {
       final List<PatchSetApproval> allApprovals =

gerrit-server/src/main/java/com/google/gerrit/server/git/MergeOp.java

@@ -355,6 +355,21 @@ public class MergeOp {
         branchTip = null;
       }
 
+      try {
+        final Ref destRef = repo.getRef(destBranch.get());
+        if (destRef != null) {
+          branchUpdate.setExpectedOldObjectId(destRef.getObjectId());
+        } else if (repo.getFullBranch().equals(destBranch.get())) {
+          branchUpdate.setExpectedOldObjectId(ObjectId.zeroId());
+        } else {
+          throw new MergeException("Destination branch \""
+              + branchUpdate.getRef().getName() + "\" does not exist");
+        }
+      } catch (IOException e) {
+        throw new MergeException(
+            "Failed to check existence of destination branch", e);
+      }
+
       for (final Ref r : repo.getAllRefs().values()) {
         if (r.getName().startsWith(Constants.R_HEADS)
             || r.getName().startsWith(Constants.R_TAGS)) {