解决 GitLab 使用第三方 SSO OAuth 登录后，external user 不符合后台配置的问题

gitlab-oauth.patch

--- user.rb	2019-10-08 18:55:14.014163674 +0800
+++ user-patched.rb 	2019-10-08 19:04:01.748236038 +0800
@@ -48,7 +48,7 @@

           gl_user.block if block_after_save

-          log.info "(#{provider}) saving user #{auth_hash.email} from login with admin => #{gl_user.admin}, extern_uid => #{auth_hash.uid}"
+          log.info "(#{provider}) saving user #{auth_hash.email} from login with admin => #{gl_user.admin}, extern_uid => #{auth_hash.uid}, primary email => #{gl_user.email}, user.external => #{gl_user.external}"
           gl_user
         rescue ActiveRecord::RecordInvalid => e
           log.info "(#{provider}) Error saving user #{auth_hash.uid} (#{auth_hash.email}): #{gl_user.errors.full_messages}"
@@ -67,7 +67,8 @@
           user ||= find_or_build_ldap_user if auto_link_ldap_user?
           user ||= build_new_user if signup_enabled?

-          user.external = true if external_provider? && user&.new_record?
+          settings = Gitlab::CurrentSettings.current_application_settings
+          user.external = settings.user_default_internal_regex_enabled? ? settings.user_default_internal_regex_instance.match(auth_hash.email).nil? : false

           user
         end