/usr/share/postgres-xc/extension/refint--1.0.sql is in postgres-xc-contrib 1.1-2ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 | /* contrib/spi/refint--1.0.sql */
-- complain if script is sourced in psql, rather than via CREATE EXTENSION
\echo Use "CREATE EXTENSION refint" to load this file. \quit
CREATE FUNCTION check_primary_key()
RETURNS trigger
AS 'MODULE_PATHNAME'
LANGUAGE C;
CREATE FUNCTION check_foreign_key()
RETURNS trigger
AS 'MODULE_PATHNAME'
LANGUAGE C;
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