/usr/share/postgresql/10/extension/uuid-ossp--unpackaged--1.0.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 15 | /* contrib/uuid-ossp/uuid-ossp--unpackaged--1.0.sql */
-- complain if script is sourced in psql, rather than via CREATE EXTENSION
\echo Use '''CREATE EXTENSION "uuid-ossp" FROM unpackaged''' to load this file. \quit
ALTER EXTENSION "uuid-ossp" ADD function uuid_nil();
ALTER EXTENSION "uuid-ossp" ADD function uuid_ns_dns();
ALTER EXTENSION "uuid-ossp" ADD function uuid_ns_url();
ALTER EXTENSION "uuid-ossp" ADD function uuid_ns_oid();
ALTER EXTENSION "uuid-ossp" ADD function uuid_ns_x500();
ALTER EXTENSION "uuid-ossp" ADD function uuid_generate_v1();
ALTER EXTENSION "uuid-ossp" ADD function uuid_generate_v1mc();
ALTER EXTENSION "uuid-ossp" ADD function uuid_generate_v3(namespace uuid, name text);
ALTER EXTENSION "uuid-ossp" ADD function uuid_generate_v4();
ALTER EXTENSION "uuid-ossp" ADD function uuid_generate_v5(namespace uuid, name text);
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