I get the error 'Branch name is invalid' when mirroring projects.
Summary
Version GitLab: GitLab Enterprise Edition 12.4.0-ee
When I try to mirror a project from atlassian bitbucket to Gitlab, I get the error 'Branch name is invalid'.
I created a new project, set up Mirroring repositories, data from a remote repository appeared in the project. However, when I try to synchronize, I get the error “Invalid branch name”, but new changes appear in my project in Gitlab, Last update attempt = Last saccessful update.
Steps to reproduce
Log gitlab/logs/sidekiq/current:
{"severity":"INFO","time":"2019-11-07T07:19:35.572Z","class":"RepositoryUpdateMirrorWorker","retry":false,"queue":"repository_update_mirror","status_expiration":54000,"jid":"e158c69b327333b2722d07d5","created_at":"2019-11-07T07:19:35.492694Z","correlation_id":"RJp9uCnXxr2","enqueued_at":"2019-11-07T07:19:35.492979Z","pid":427,"message":"RepositoryUpdateMirrorWorker JID-e158c69b327333b2722d07d5: start","job_status":"start","scheduling_latency_s":0.079386}
{"severity":"WARN","time":"2019-11-07T07:19:38.099Z","class":"RepositoryUpdateMirrorWorker","retry":false,"queue":"repository_update_mirror","status_expiration":54000,"jid":"e158c69b327333b2722d07d5","created_at":"2019-11-07T07:19:35.492694Z","correlation_id":"RJp9uCnXxr2","enqueued_at":"2019-11-07T07:19:35.492979Z","pid":427,"message":"RepositoryUpdateMirrorWorker JID-e158c69b327333b2722d07d5: fail: 2.526801 sec","job_status":"fail","scheduling_latency_s":0.079386,"duration":2.526801,"cpu_s":0.078801,"completed_at":"2019-11-07T07:19:38.098997Z","error_message":"Branch name is invalid","error_class":"RepositoryUpdateMirrorWorker::UpdateError"}
{"severity":"WARN","time":"2019-11-07T07:19:38.102Z","error_class":"RepositoryUpdateMirrorWorker::UpdateError","error_message":"Branch name is invalid","context":"Job raised exception","jobstr":"{\"class\":\"RepositoryUpdateMirrorWorker\",\"args\":[358],\"retry\":false,\"queue\":\"repository_update_mirror\",\"status_expiration\":54000,\"jid\":\"e158c69b327333b2722d07d5\",\"created_at\":1573111175.4926944,\"correlation_id\":\"RJp9uCnXxr2\",\"enqueued_at\":1573111175.4929793}","class":"RepositoryUpdateMirrorWorker","args":[358],"retry":false,"queue":"repository_update_mirror","status_expiration":54000,"jid":"e158c69b327333b2722d07d5","created_at":1573111175.4926944,"correlation_id":"RJp9uCnXxr2","enqueued_at":1573111175.4929793,"error_backtrace":["ee/app/workers/repository_update_mirror_worker.rb:25:in `perform'","lib/gitlab/sidekiq_daemon/monitor.rb:43:in `within_job'"]}