Merge pull request #647 from infosiftr/help

Check for "help" to short circuit server starting (since they break when passed to pg_ctl)

docker-entrypoint.sh

@@ -229,13 +229,30 @@ docker_temp_server_stop() {
 	pg_ctl -D "$PGDATA" -m fast -w stop
 }
 
+# check arguments for an option that would cause postgres to stop
+# return true if there is one
+_pg_want_help() {
+	local arg
+	for arg; do
+		case "$arg" in
+			# postgres --help | grep 'then exit'
+			# leaving out -C on purpose since it always fails and is unhelpful:
+			# postgres: could not access the server configuration file "/var/lib/postgresql/data/postgresql.conf": No such file or directory
+			-'?'|--help|--describe-config|-V|--version)
+				return 0
+				;;
+		esac
+	done
+	return 1
+}
+
 _main() {
 	# if first arg looks like a flag, assume we want to run postgres server
 	if [ "${1:0:1}" = '-' ]; then
 		set -- postgres "$@"
 	fi
 
-	if [ "$1" = 'postgres' ]; then
+	if [ "$1" = 'postgres' ] && ! _pg_want_help "$@"; then
 		docker_setup_env
 		# setup data directories and permissions (when run as root)
 		docker_create_db_directories