It does execute the task "lib/tasks/gitlab/import.rake
" which contains the comment:
# How to use:
#
# 1. copy the bare repos under the repos_path (commonly /home/git/repositories)
# 2. run: bundle exec rake gitlab:import:repos RAILS_ENV=production
Its full documentation is at "doc/raketasks/import.md
"
So there is no special arguments to pass to that command: simply copy the bare repos where they need to be for GitLab to manage them, and complete the import process with that command.