gitlab-foss/config/initializers/validate_database_config.rb

# frozen_string_literal: true

if Gitlab::Utils.to_boolean(ENV['SKIP_DATABASE_CONFIG_VALIDATION'], default: false)
  return
end

if configurations = ActiveRecord::Base.configurations.configurations
  if configurations.first.name != Gitlab::Database::MAIN_DATABASE_NAME
    raise "ERROR: This installation of GitLab uses unsupported 'config/database.yml'. " \
      "The `main:` database needs to be defined as a first configuration item instead of `#{configurations.first.name}`."
  end

  all_database_names = Gitlab::Database.all_database_names
  rejected_config_names = configurations.map(&:name).to_set - all_database_names
  if rejected_config_names.any?
    raise "ERROR: This installation of GitLab uses unsupported database names " \
      "in 'config/database.yml': #{rejected_config_names.to_a.join(', ')}. The only supported ones are " \
      "#{all_database_names.join(', ')}."
  end

  replicas_config_names = configurations.select(&:replica?).map(&:name)
  if replicas_config_names.any?
    raise "ERROR: This installation of GitLab uses unsupported database configuration " \
      "with 'replica: true' parameter in 'config/database.yml' for: #{replicas_config_names.join(', ')}"
  end
end