Merge branch 'sh-fix-wrong-commit-count-in-push' into 'master'

Fix wrong commit count in push event payload

Closes #49971

See merge request gitlab-org/gitlab-ce!21338

app/services/git_push_service.rb

@@ -158,7 +158,7 @@ class GitPushService < BaseService
   end
 
   def process_default_branch
-    offset = [push_commits_count - PROCESS_COMMIT_LIMIT, 0].max
+    offset = [push_commits_count_for_ref - PROCESS_COMMIT_LIMIT, 0].max
     @push_commits = project.repository.commits(params[:newrev], offset: offset, limit: PROCESS_COMMIT_LIMIT)
 
     project.after_create_default_branch
@@ -172,7 +172,7 @@ class GitPushService < BaseService
       params[:newrev],
       params[:ref],
       @push_commits,
-      commits_count: push_commits_count)
+      commits_count: commits_count)
   end
 
   def push_to_existing_branch?
@@ -213,8 +213,14 @@ class GitPushService < BaseService
     end
   end
 
-  def push_commits_count
-    strong_memoize(:push_commits_count) do
+  def commits_count
+    return push_commits_count_for_ref if default_branch? && push_to_new_branch?
+
+    Array(@push_commits).size
+  end
+
+  def push_commits_count_for_ref
+    strong_memoize(:push_commits_count_for_ref) do
       project.repository.commit_count_for_ref(params[:ref])
     end
   end

changelogs/unreleased/sh-fix-wrong-commit-count-in-push.yml

+---
+title: Fix wrong commit count in push event payload
+merge_request: 21338
+author:
+type: fixed

spec/services/git_push_service_spec.rb

@@ -204,16 +204,37 @@ describe GitPushService, services: true do
   end
 
   describe "Push Event" do
-    let!(:push_data) { push_data_from_service(project, user, oldrev, newrev, ref) }
-    let(:event) { Event.find_by_action(Event::PUSHED) }
+    context "with an existing branch" do
+      let!(:push_data) { push_data_from_service(project, user, oldrev, newrev, ref) }
+      let(:event) { Event.find_by_action(Event::PUSHED) }
 
-    it { expect(event).to be_an_instance_of(PushEvent) }
-    it { expect(event.project).to eq(project) }
-    it { expect(event.action).to eq(Event::PUSHED) }
-    it { expect(event.push_event_payload).to be_an_instance_of(PushEventPayload) }
-    it { expect(event.push_event_payload.commit_from).to eq(oldrev) }
-    it { expect(event.push_event_payload.commit_to).to eq(newrev) }
-    it { expect(event.push_event_payload.ref).to eq('master') }
+      it 'generates a push event with one commit' do
+        expect(event).to be_an_instance_of(PushEvent)
+        expect(event.project).to eq(project)
+        expect(event.action).to eq(Event::PUSHED)
+        expect(event.push_event_payload).to be_an_instance_of(PushEventPayload)
+        expect(event.push_event_payload.commit_from).to eq(oldrev)
+        expect(event.push_event_payload.commit_to).to eq(newrev)
+        expect(event.push_event_payload.ref).to eq('master')
+        expect(event.push_event_payload.commit_count).to eq(1)
+      end
+    end
+
+    context "with a new branch" do
+      let!(:new_branch_data) { push_data_from_service(project, user, Gitlab::Git::BLANK_SHA, newrev, ref) }
+      let(:event) { Event.find_by_action(Event::PUSHED) }
+
+      it 'generates a push event with more than one commit' do
+        expect(event).to be_an_instance_of(PushEvent)
+        expect(event.project).to eq(project)
+        expect(event.action).to eq(Event::PUSHED)
+        expect(event.push_event_payload).to be_an_instance_of(PushEventPayload)
+        expect(event.push_event_payload.commit_from).to be_nil
+        expect(event.push_event_payload.commit_to).to eq(newrev)
+        expect(event.push_event_payload.ref).to eq('master')
+        expect(event.push_event_payload.commit_count).to be > 1
+      end
+    end
 
     context "Updates merge requests" do
       it "when pushing a new branch for the first time" do
@@ -224,6 +245,7 @@ describe GitPushService, services: true do
     end
 
     describe 'system hooks' do
+      let!(:push_data) { push_data_from_service(project, user, oldrev, newrev, ref) }
       let(:system_hooks_service) { SystemHooksService.new }
 
       it "sends a system hook after pushing a branch" do