Backfill wiki repositories

app/services/geo/repository_backfill_service.rb

@@ -10,7 +10,7 @@ module Geo
 
     def execute
       try_obtain_lease do
-        synchronize do |started_at, finished_at|
+        fetch_repositories do |started_at, finished_at|
           registry = Geo::ProjectRegistry.find_or_create_by(project_id: project.id)
           registry.last_repository_synced_at = started_at
           registry.last_repository_successful_sync_at = finished_at if finished_at
@@ -21,7 +21,7 @@ module Geo
 
     private
 
-    def synchronize
+    def fetch_repositories
       started_at  = DateTime.now
       finished_at = nil
 
@@ -29,6 +29,12 @@ module Geo
         project.create_repository unless project.repository_exists?
         project.repository.after_create if project.empty_repo?
         project.repository.fetch_geo_mirror(ssh_url_to_repo)
+
+        # Second .wiki call returns a Gollum::Wiki, and it will always create the physical repository when not found
+        if project.wiki_enabled? && project.wiki.wiki.exist?
+          project.wiki.repository.fetch_geo_mirror(ssh_url_to_wiki)
+        end
+
         project.repository.expire_all_method_caches
         project.repository.expire_branch_cache
         project.repository.expire_content_cache
@@ -59,8 +65,16 @@ module Geo
       @key ||= "repository_backfill_service:#{project.id}"
     end
 
+    def primary_ssh_path_prefix
+      Gitlab::Geo.primary_ssh_path_prefix
+    end
+
     def ssh_url_to_repo
-      "#{Gitlab::Geo.primary_ssh_path_prefix}#{project.path_with_namespace}.git"
+      "#{primary_ssh_path_prefix}#{project.path_with_namespace}.git"
+    end
+
+    def ssh_url_to_wiki
+      "#{primary_ssh_path_prefix}#{project.path_with_namespace}.wiki.git"
     end
   end
 end