add and options

examples/tunasync.conf

@@ -31,6 +31,7 @@ provider = "shell"
 command = "sleep 10"
 local_dir = "/mnt/sdb1/mirror/archlinux/current/"
 # log_file = "/dev/null"
+exec_post_sync = "/bin/bash -c 'date --utc \"+%s\" > ${TUNASYNC_WORKING_DIR}/.timestamp'"
 
 [[mirrors]]
 name = "arch2"