nc-restore: check btrfs command

bin/ncp/BACKUPS/nc-restore.sh

@@ -110,7 +110,7 @@ if [[ $( ls "$TMPDIR" | wc -l ) -eq $NUMFILES ]]; then
   echo "restore datadir to $DATADIR..."
   
   mkdir -p "$DATADIR"
-  [[ "$( stat -fc%T "$DATADIR" )" == "btrfs" ]] && {
+  [[ "$( stat -fc%T "$DATADIR" )" == "btrfs" ]] && which btrfs &>/dev/null && {
     rmdir "$DATADIR"                  || exit 1
     btrfs subvolume create "$DATADIR" || exit 1
   }

update.sh

@@ -170,6 +170,7 @@ EOF
 
   # update nc-backup
   install_app nc-backup
+  install_app nc-restore
 
   # create UPDATES section
   updates_dir=/usr/local/bin/ncp/UPDATES