avoid githooks if annex commit is pushed to normal branch

lib/gitlab/git_access.rb

@@ -213,6 +213,7 @@ module Gitlab
           end
 
         commits.each do |commit|
+          next if commit_from_annex_sync?(commit, ref)
           if status_object = check_commit(commit, git_hook)
             return status_object
           end
@@ -364,5 +365,12 @@ module Gitlab
 
       true
     end
+
+    def commit_from_annex_sync?(rev, ref)
+      return false unless Gitlab.config.gitlab_shell.git_annex_enabled
+
+      # Commit present in synced/current_branch, so avoid checking git hooks on this
+      project.repository.branch_names_contains(rev).contains? "synced/#{ref}"
+    end
   end
 end