Check supported version when migrating

Set the mininum supported migration version to be the schema version as
of 11.11.0, and errors you if that is not detected during
gitlab:db:configure

2 files changed, 8 insertions, 0 deletions

diff --git a/lib/gitlab/database.rb b/lib/gitlab/database.rb
index e4d4779ba9a..5e5b79b8e99 100644
--- a/lib/gitlab/database.rb
+++ b/lib/gitlab/database.rb
@@ -11,6 +11,10 @@ module Gitlab
     # https://dev.mysql.com/doc/refman/5.7/en/datetime.html
     MAX_TIMESTAMP_VALUE = Time.at((1 << 31) - 1).freeze
 
+    # Minimum schema version from which migrations are be supported
+    # Migrations before this version may have been removed
+    MIN_SCHEMA_VERSION = 20190506135400
+
     def self.config
       ActiveRecord::Base.configurations[Rails.env]
     end
diff --git a/lib/tasks/gitlab/db.rake b/lib/tasks/gitlab/db.rake
index 4e7a8adbef6..3a371de5bb7 100644
--- a/lib/tasks/gitlab/db.rake
+++ b/lib/tasks/gitlab/db.rake
@@ -53,6 +53,10 @@ namespace :gitlab do
       # Check if we have existing db tables
       # The schema_migrations table will still exist if drop_tables was called
       if ActiveRecord::Base.connection.tables.count > 1
+        if ActiveRecord::Migrator.current_version < Gitlab::Database::MIN_SCHEMA_VERSION
+          raise "Your current database version is too old to be migrated. Please see https://docs.gitlab.com/ee/policy/maintenance.html#upgrade-recommendations"
+        end
+
         Rake::Task['db:migrate'].invoke
       else
         # Add post-migrate paths to ensure we mark all migrations as up