new: [vps] updated final command to run after installation of backup

Signed-off-by: Valentin Lab <valentin.lab@kalysto.org>

bin/vps

@@ -230,11 +230,18 @@ mailcow:install-backup() {
 
     dest="$BACKUP_SERVER"
     dest="${dest%/*}"
-    dest="${dest%%:*}"
-
-    info "You should add key on '$dest' host:"
-    echo compose-add-rsync-key -R "\"$DOMAIN\"" "\"$(cat /var/lib/rsync/.ssh/id_rsa.pub)\""
+    ssh_options=()
+    if [[ "$dest" == *":"* ]]; then
+        port="${dest##*:}"
+        dest="${dest%%:*}"
+        ssh_options=(-p "$port")
+    else
+        port=""
+        dest="${dest%%:*}"
+    fi
 
+    info "You can run this following from an host having admin access to $dest:"
+    echo "ssh ${ssh_options[@]} rsync@$dest ssh-key add \"$(cat /var/lib/rsync/.ssh/id_rsa.pub)\""
 }
 
 compose:install-backup() {
@@ -302,10 +309,23 @@ $(e "$private_key" | sed -r 's/^/      /g')
 EOF
     fi
 
-    info "You can run this following command on $BACKUP_SERVER:"
-    public_key=$(ssh-keygen -y -f <(e "$private_key"$'\n'))
-    echo "compose-add-rsync-key -R '$host' '$public_key ${service_name}@$host'"
 
+    dest="$BACKUP_SERVER"
+    dest="${dest%/*}"
+    ssh_options=()
+    ssh_options=()
+    if [[ "$dest" == *":"* ]]; then
+        port="${dest##*:}"
+        dest="${dest%%:*}"
+        ssh_options=(-p "$port")
+    else
+        port=""
+        dest="${dest%%:*}"
+    fi
+
+    info "You can run this following from an host having admin access to $dest:"
+    public_key=$(ssh-keygen -y -f <(e "$private_key"$'\n'))
+    echo "ssh ${ssh_options[@]} rsync@$dest ssh-key add '$public_key ${service_name}@$host'"
 }