[type/__postgres_conf] Restart PostgreSQL server based on pending_restart column of pg_settings

cdist/conf/type/__postgres_conf/explorer/context

@@ -1,43 +0,0 @@
-#!/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/>.
-#
-# Returns the "context" of the configuration setting.
-# cf. also https://www.postgresql.org/docs/10/view-pg-settings.html
-
-os=$("${__explorer:?}/os")
-
-case ${os}
-in
-	(openbsd)
-		postgres_user='_postgresql'
-		;;
-	(devuan)
-		postgres_user='postgres'
-		;;
-	(*)
-		echo "Unsupported OS: ${os}" >&2
-		exit 1
-		;;
-esac
-
-conf_name=${__object_id:?}
-
-# NOTE: SHOW/SET are case-insentitive, so this command should also be.
-su - "${postgres_user}" -c "psql postgres -twAc \"SELECT context FROM pg_settings WHERE lower(name) = lower('${conf_name}')\""

cdist/conf/type/__postgres_conf/gencode-remote

@@ -98,15 +98,11 @@ in
 		;;
 esac
 
-# check success (makes only sense if setting to a non-default value)
-# and restart server if needed
-if test "${state_should}" = 'present'
-then
-	cat <<-EOF
+# Restart PostgreSQL server if required to apply new configuration value
+cat <<EOF
 
-	$(psql_cmd postgres -twAc "SHOW ${conf_name}") \\
-	| cmp -s "\${__object:?}/parameter/value" - || {
-		${restart_command}
-	}
-	EOF
+if test 't' = "\$($(psql_cmd postgres -twAc "SELECT pending_restart FROM pg_settings WHERE lower(name) = lower('${conf_name}')"))"
+then
+	${restart_command}
 fi
+EOF