This file is indexed.

/usr/share/postgresql/9.3/extension/dblink--1.0--1.1.sql is in postgresql-contrib-9.3 9.3.4-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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/* contrib/dblink/dblink--1.0--1.1.sql */

-- complain if script is sourced in psql, rather than via CREATE 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;