#!/bin/sh -e
# -*- mode: sh; indent-tabs-mode: t -*-
#
# 2021 Dennis Camera (dennis.camera at ssrq-sds-fds.ch)
#
# This file is part of cdist.
#
# cdist is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# cdist is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with cdist. If not, see <http://www.gnu.org/licenses/>.
#

os=$("${__explorer:?}/os")

case ${os}
in
	(alpine)
		echo 'postgres'
		;;
	(centos|rhel|scientific)
		echo 'postgres'
		;;
	(debian|devuan|ubuntu)
		echo 'postgres'
		;;
	(freebsd)
		test -x /usr/local/etc/rc.d/postgresql || {
			printf 'could not find postgresql rc script./n' >&2
			exit 1
		}
		pg_status=$(/usr/local/etc/rc.d/postgresql onestatus) || {
			printf 'postgresql daemon is not running.\n' >&2
			exit 1
		}
		pg_pid=$(printf '%s\n' "${pg_status}" \
			| sed -n 's/^pg_ctl:.*(PID: *\([0-9]*\))$/\1/p')

		# PostgreSQL < 9.6: pgsql
		# PostgreSQL >= 9.6: postgres
		ps -o user -p "${pg_pid}" | sed -n '2p'
		;;
	(netbsd)
		echo 'pgsql'
		;;
	(openbsd)
		echo '_postgresql'
		;;
	(suse)
		echo 'postgres'
		;;
	(*)
		echo "Unsupported OS: ${os}" >&2
		exit 1
		;;
esac