/usr/share/postgresql/9.5/extension/pgespresso--1.0.sql is in postgresql-9.5-pgespresso 1.0-3.
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 | -- pgespresso - PostgreSQL extension for Barman (www.pgbarman.org)
-- complain if script is sourced in psql, rather than via CREATE EXTENSION
\echo Use "CREATE EXTENSION pgespresso" to load this file. \quit
CREATE FUNCTION pgespresso_start_backup(label TEXT, fast BOOL) RETURNS TEXT
AS 'MODULE_PATHNAME'
LANGUAGE C STRICT;
CREATE FUNCTION pgespresso_stop_backup(label_content TEXT) RETURNS TEXT
AS 'MODULE_PATHNAME'
LANGUAGE C STRICT;
CREATE FUNCTION pgespresso_abort_backup() RETURNS VOID
AS 'MODULE_PATHNAME'
LANGUAGE C STRICT;
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