Use Gitlab::Git operations for repository mirroring

app/models/concerns/repository_mirroring.rb

-module RepositoryMirroring
-  IMPORT_HEAD_REFS = '+refs/heads/*:refs/heads/*'.freeze
-  IMPORT_TAG_REFS = '+refs/tags/*:refs/tags/*'.freeze
-
-  def set_remote_as_mirror(name)
-    # This is used to define repository as equivalent as "git clone --mirror"
-    raw_repository.rugged.config["remote.#{name}.fetch"] = 'refs/*:refs/*'
-    raw_repository.rugged.config["remote.#{name}.mirror"] = true
-    raw_repository.rugged.config["remote.#{name}.prune"] = true
-  end
-
-  def set_import_remote_as_mirror(remote_name)
-    # Add first fetch with Rugged so it does not create its own.
-    raw_repository.rugged.config["remote.#{remote_name}.fetch"] = IMPORT_HEAD_REFS
-
-    add_remote_fetch_config(remote_name, IMPORT_TAG_REFS)
-
-    raw_repository.rugged.config["remote.#{remote_name}.mirror"] = true
-    raw_repository.rugged.config["remote.#{remote_name}.prune"] = true
-  end
-
-  def add_remote_fetch_config(remote_name, refspec)
-    run_git(%W[config --add remote.#{remote_name}.fetch #{refspec}])
-  end
-
-  def fetch_mirror(remote, url)
-    add_remote(remote, url)
-    set_remote_as_mirror(remote)
-    fetch_remote(remote, forced: true)
-    remove_remote(remote)
-  end
-end

app/models/repository.rb

@@ -15,7 +15,6 @@ class Repository
   ].freeze
 
   include Gitlab::ShellAdapter
-  include RepositoryMirroring
 
   attr_accessor :full_path, :disk_path, :project, :is_wiki