If GL_USER set with some garbage - reset it

Author: dzaporozhets

lib/gitlab_update.rb

@@ -18,6 +18,13 @@ def exec
  # without validation of access
  exit 0 if @key_id.nil?
 
+ # Also skip update hook for non-gitlab keys
+ # and reset GL_USER env
+ unless @key_id =~ /\Akey\-\d+\Z/
+ ENV['GL_USER'] = nil
+ exit 0
+ end
+
  if api.allowed?('git-receive-pack', @repo_name, @key_id, @refname)
  exit 0
  else