Add config_options|variables to BuildMetadata

These are data columns that store runtime configuration
of build needed to execute it on runner and within pipeline.

The definition of this data is that once used, and when no longer
needed (due to retry capability) they can be freely removed.

They use `jsonb` on PostgreSQL, and `text` on MySQL (due to lacking
support for json datatype on old enough version).

1 files changed, 31 insertions, 0 deletions

diff --git a/config/initializers/ar_mysql_jsonb_support.rb b/config/initializers/ar_mysql_jsonb_support.rb
new file mode 100644
index 00000000000..63a0b05119a
--- /dev/null
+++ b/config/initializers/ar_mysql_jsonb_support.rb
@@ -0,0 +1,31 @@
+# frozen_string_literal: true
+
+require 'active_record/connection_adapters/abstract_mysql_adapter'
+require 'active_record/connection_adapters/mysql/schema_definitions'
+
+# MySQL (5.6) and MariaDB (10.1) are currently supported versions within GitLab,
+# Since they do not support native `json` datatype we force to emulate it as `text`
+
+if Gitlab::Database.mysql?
+  module ActiveRecord
+    module ConnectionAdapters
+      class AbstractMysqlAdapter
+        JSON_DATASIZE = 1.megabyte
+
+        NATIVE_DATABASE_TYPES.merge!(
+          json: { name: "text", limit: JSON_DATASIZE },
+          jsonb: { name: "text", limit: JSON_DATASIZE }
+        )
+      end
+
+      module MySQL
+        module ColumnMethods
+          # We add `jsonb` helper, as `json` is already defined for `MySQL` since Rails 5
+          def jsonb(*args, **options)
+            args.each { |name| column(name, :json, options) }
+          end
+        end
+      end
+    end
+  end
+end