/usr/share/postgresql/10/extension/dblink--1.0--1.1.sql is in postgresql-10 10.6-0ubuntu0.18.04.1.
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/dblink/dblink--1.0--1.1.sql */
-- complain if script is sourced in psql, rather than via ALTER EXTENSION
\echo Use "ALTER EXTENSION dblink UPDATE TO '1.1'" to load this file. \quit
CREATE FUNCTION dblink_fdw_validator(
options text[],
catalog oid
)
RETURNS void
AS 'MODULE_PATHNAME', 'dblink_fdw_validator'
LANGUAGE C STRICT;
CREATE FOREIGN DATA WRAPPER dblink_fdw VALIDATOR dblink_fdw_validator;
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