Merge branch 'follow-on-mr376' into 'master'

Follow on to MR 376

Follow-on to MR 376 from @haynes . Remove unnecessary fetch of commit messages for initial push. This will reduce the memory usage significantly.

See merge request !387

CHANGELOG

@@ -2,6 +2,7 @@ Please view this file on the master branch, on stable branches it's out of date.
 
 v 7.9.0 (unreleased)
   - Update documentation for object_kind field in Webhook push and tag push Webhooks (Stan Hu)
+  - Remove unnecessary fetch of commit messages on initial push (Perforce Software)
   - Fix broken email images (Hannes Rosenögger)
   - Fix mass SQL statements on initial push (Hannes Rosenögger)
   - Add tag push notifications and normalize HipChat and Slack messages to be consistent (Stan Hu)

app/services/git_push_service.rb

@@ -29,9 +29,6 @@ class GitPushService
       elsif push_to_new_branch?(ref, oldrev)
         # Re-find the pushed commits.
         if is_default_branch?(ref)
-          # Initial push to the default branch. Take the full history of that branch as "newly pushed".
-          @push_commits = project.repository.commits(newrev)
-
           # Set protection on the default branch if configured
           if (current_application_settings.default_branch_protection != PROTECTION_NONE)
             developers_can_push = current_application_settings.default_branch_protection == PROTECTION_DEV_CAN_PUSH ? true : false