[type/__postgres_conf] Reverse state logic (decide based on source first)

cdist/conf/type/__postgres_conf/explorer/state

@@ -200,23 +200,24 @@ psql_exec 'SELECT 1' >/dev/null || {
 	exit 1
 }
 
-if psql_conf_cmp "${conf_name}" "$(cat "${__object:?}/parameter/value")"
+case $(psql_conf_source "${conf_name}")
-then
+in
-	echo present
+	('')
-else
+		printf 'Invalid configuration parameter: %s\n' "${conf_name}" >&2
-	case $(psql_conf_source "${conf_name}")
+		exit 1
-	in
+		;;
-		('')
+	(default)
-			# invalid configuration parameter
+		echo absent
-			# (error message was already printed by SHOW command above.
+		;;
-			#  Yes, it's a hack)
+	(*)
-			exit 1
+		if ! test -f "${__object:?}/parameter/value"
-			;;
+		then
-		(default)
+			echo present
-			echo absent
+		elif psql_conf_cmp "${conf_name}" "$(cat "${__object:?}/parameter/value")"
-			;;
+		then
-		(*)
+			echo present
+		else
 			echo different
-			;;
+		fi
-	esac
+		;;
-fi
+esac