fixed errors in nc-mntuser

src/nextcloud/assets/bin/nc-mntuser

@@ -4,6 +4,7 @@ if [[ -z $1 ]]; then
         echo "Usage: $0 user"
         exit 2
 fi
+user=$1
 
 intdir=/srv/nextcloud/data
 extdir=/vol/files
@@ -14,7 +15,10 @@ nc-occ maintenance:mode --on
 
 mkdir -p $intdir/$user/files
 chown -R www-data:www-data $intdir/$user
-echo "$extdir/$user $intdir/$user/files none defaults,bind 0 0" >> /etc/fstab
+line="$extdir/$user $intdir/$user/files none defaults,bind,nofail 0 0"
+if ! grep -q "$line" /etc/fstab ; then
+    echo "$line" >> /etc/fstab
+fi
 mount -a
 
 nc-occ maintenance:mode --off