/usr/share/postgresql/10/extension/file_fdw--1.0.sql is in postgresql-10 10.3-1.
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 16 17 18 | /* contrib/file_fdw/file_fdw--1.0.sql */
-- complain if script is sourced in psql, rather than via CREATE EXTENSION
\echo Use "CREATE EXTENSION file_fdw" to load this file. \quit
CREATE FUNCTION file_fdw_handler()
RETURNS fdw_handler
AS 'MODULE_PATHNAME'
LANGUAGE C STRICT;
CREATE FUNCTION file_fdw_validator(text[], oid)
RETURNS void
AS 'MODULE_PATHNAME'
LANGUAGE C STRICT;
CREATE FOREIGN DATA WRAPPER file_fdw
HANDLER file_fdw_handler
VALIDATOR file_fdw_validator;
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