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# frozen_string_literal: true
module Gitlab
module Database
class SchemaCleaner
attr_reader :original_schema
def initialize(original_schema)
@original_schema = original_schema
end
def clean(io)
structure = original_schema.dup
# Remove noise
structure.gsub!(/^COMMENT ON EXTENSION.*/, '')
structure.gsub!(/^SET.+/, '')
structure.gsub!(/^SELECT pg_catalog\.set_config\('search_path'.+/, '')
structure.gsub!(/^--.*/, "\n")
# We typically don't assume we're working with the public schema.
# pg_dump uses fully qualified object names though, since we have multiple schemas
# in the database.
#
# The intention here is to not introduce an assumption about the standard schema,
# unless we have a good reason to do so.
structure.gsub!(/public\.(\w+)/, '\1')
structure.gsub!(/CREATE EXTENSION IF NOT EXISTS (\w+) WITH SCHEMA public;/, 'CREATE EXTENSION IF NOT EXISTS \1;')
structure.gsub!(/\n{3,}/, "\n\n")
io << structure.strip
io << <<~MSG
-- schema_migrations.version information is no longer stored in this file,
-- but instead tracked in the db/schema_migrations directory
-- see https://gitlab.com/gitlab-org/gitlab/-/issues/218590 for details
MSG
nil
end
end
end
end
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