Make LDAP sync time configurable.

app/models/user.rb

@@ -419,7 +419,7 @@ class User < ActiveRecord::Base
     if !Gitlab.config.ldap.enabled
       false
     elsif ldap_user?
-      !last_credential_check_at || (last_credential_check_at + 1.hour) < Time.now
+      !last_credential_check_at || (last_credential_check_at + Gitlab.config.ldap['sync_time']) < Time.now
     else
       false
     end

config/gitlab.yml.example

@@ -134,6 +134,12 @@ production: &base
     method: 'ssl' # "tls" or "ssl" or "plain"
     bind_dn: '_the_full_dn_of_the_user_you_will_bind_with'
     password: '_the_password_of_the_bind_user'
+
+    # This setting is used to change how often LDAP group membership is updated.
+    # WARNING! Be advised that changing this setting can have severe performance consequences!
+    # Default: 1 hour.
+    # sync_time: 3600
+
     # If allow_username_or_email_login is enabled, GitLab will ignore everything
     # after the first '@' in the LDAP username submitted by the user on login.
     #

config/initializers/1_settings.rb

@@ -57,6 +57,7 @@ end
 Settings['ldap'] ||= Settingslogic.new({})
 Settings.ldap['enabled'] = false if Settings.ldap['enabled'].nil?
 Settings.ldap['allow_username_or_email_login'] = false if Settings.ldap['allow_username_or_email_login'].nil?
+Settings.ldap['sync_time'] = 3600 if Settings.ldap['sync_time'].nil?
 
 
 Settings['omniauth'] ||= Settingslogic.new({})