Improve migrations using triggerscheck-trigger-permissions-mysql

This adds a bunch of checks to migrations that may create or drop
triggers. Dropping triggers/functions is done using "IF EXISTS" so we
don't throw an error if the object in question has already been dropped.
We now also raise a custom error (message) when the user does not have
TRIGGER privileges. This should prevent the schema from entering an
inconsistent state while also providing the user with enough information
on how to solve the problem.

The recommendation of using SUPERUSER permissions is a bit extreme but
we require this anyway (Omnibus also configures users with this
permission).

Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/36633

1 files changed, 8 insertions, 0 deletions

diff --git a/lib/gitlab/database.rb b/lib/gitlab/database.rb
index e001d25e7b7..a6ec75da385 100644
--- a/lib/gitlab/database.rb
+++ b/lib/gitlab/database.rb
@@ -9,6 +9,14 @@ module Gitlab
       ActiveRecord::Base.configurations[Rails.env]
     end
 
+    def self.username
+      config['username'] || ENV['USER']
+    end
+
+    def self.database_name
+      config['database']
+    end
+
     def self.adapter_name
       config['adapter']
     end