Merge branch '35709-update-squash-commit-sha-only-on-successful-merge' into 'master'

Update squash_commit_sha only on successful merge

See merge request gitlab-org/gitlab!19688

app/services/merge_requests/ff_merge_service.rb

@@ -11,19 +11,21 @@ module MergeRequests
     private
 
     def commit
-      repository.ff_merge(current_user,
-                          source,
-                          merge_request.target_branch,
-                          merge_request: merge_request)
+      ff_merge = repository.ff_merge(current_user,
+                                     source,
+                                     merge_request.target_branch,
+                                     merge_request: merge_request)
+
+      if merge_request.squash
+        merge_request.update_column(:squash_commit_sha, merge_request.in_progress_merge_commit_sha)
+      end
+
+      ff_merge
     rescue Gitlab::Git::PreReceiveError => e
       raise MergeError, e.message
     rescue StandardError => e
       raise MergeError, "Something went wrong during merge: #{e.message}"
     ensure
-      if merge_request.squash
-        merge_request.update_column(:squash_commit_sha, merge_request.in_progress_merge_commit_sha)
-      end
-
       merge_request.update(in_progress_merge_commit_sha: nil)
     end
   end

changelogs/unreleased/35709-update-squash-commit-sha-only-on-successful-merge.yml

+---
+title: Update squash_commit_sha only on successful merge
+merge_request: 19688
+author:
+type: fixed

spec/services/merge_requests/ff_merge_service_spec.rb

@@ -24,33 +24,63 @@ describe MergeRequests::FfMergeService do
     context 'valid params' do
       let(:service) { described_class.new(project, user, valid_merge_params) }
 
-      before do
-        allow(service).to receive(:execute_hooks)
-
+      def execute_ff_merge
         perform_enqueued_jobs do
           service.execute(merge_request)
         end
       end
 
+      before do
+        allow(service).to receive(:execute_hooks)
+      end
+
       it "does not create merge commit" do
+        execute_ff_merge
+
         source_branch_sha = merge_request.source_project.repository.commit(merge_request.source_branch).sha
         target_branch_sha = merge_request.target_project.repository.commit(merge_request.target_branch).sha
+
         expect(source_branch_sha).to eq(target_branch_sha)
       end
 
-      it { expect(merge_request).to be_valid }
-      it { expect(merge_request).to be_merged }
+      it 'keeps the merge request valid' do
+        expect { execute_ff_merge }
+          .not_to change { merge_request.valid? }
+      end
+
+      it 'updates the merge request to merged' do
+        expect { execute_ff_merge }
+          .to change { merge_request.merged? }
+          .from(false)
+          .to(true)
+      end
 
       it 'sends email to user2 about merge of new merge_request' do
+        execute_ff_merge
+
         email = ActionMailer::Base.deliveries.last
         expect(email.to.first).to eq(user2.email)
         expect(email.subject).to include(merge_request.title)
       end
 
       it 'creates system note about merge_request merge' do
+        execute_ff_merge
+
         note = merge_request.notes.last
         expect(note.note).to include 'merged'
       end
+
+      it 'does not update squash_commit_sha if it is not a squash' do
+        expect { execute_ff_merge }.not_to change { merge_request.squash_commit_sha }
+      end
+
+      it 'updates squash_commit_sha if it is a squash' do
+        merge_request.update!(squash: true)
+
+        expect { execute_ff_merge }
+          .to change { merge_request.squash_commit_sha }
+          .from(nil)
+      end
     end
 
     context 'error handling' do
@@ -83,6 +113,16 @@ describe MergeRequests::FfMergeService do
         expect(merge_request.merge_error).to include(error_message)
         expect(Rails.logger).to have_received(:error).with(a_string_matching(error_message))
       end
+
+      it 'does not update squash_commit_sha if squash merge is not successful' do
+        merge_request.update!(squash: true)
+
+        expect(project.repository.raw).to receive(:ff_merge) do
+          raise 'Merge error'
+        end
+
+        expect { service.execute(merge_request) }.not_to change { merge_request.squash_commit_sha }
+      end
     end
   end
 end