Only use --link-dest when backing up populated directories

Author: lildude

share/github-backup-utils/ghe-backup-userdata

@@ -26,9 +26,9 @@ ghe_remote_version_required "$host"
 # to an older version of GHE or no data has been added to this directory yet.
 ghe-ssh "$host" -- "[ -d '$GHE_REMOTE_DATA_USER_DIR/$dirname' ]" || exit 0
 
-# If we have a previous increment, avoid transferring existing files via rsync's
+# If we have a previous increment and it is not empty, avoid transferring existing files via rsync's
 # --link-dest support. This also decreases physical space usage considerably.
-if [ -d "$GHE_DATA_DIR/current/$dirname" ]; then
+if [ -d "$GHE_DATA_DIR/current/$dirname" ] && [ "$(ls -A $GHE_DATA_DIR/current/$dirname)" ]; then
     link_dest="--link-dest=../../current/$dirname"
 fi