Implement timeout for krb5 ticket retrieval during VPN connections

roles/lmn_vpn/files/10-lmn-mount.sh

@@ -13,12 +13,17 @@ if [[ "$CONNECTION_ID" = "VPN-Schule" ]]; then
     # Exit if server is already mounted
     findmnt /srv/samba/schools/default-school > /dev/null && exit 0
 
-    if ! klist -s  -c "${KRB5CCNAME}"; then
+    counter=1
+    while ! klist -s -c "${KRB5CCNAME}"; do
+      (( counter > 30 )) && exit 0
+      echo "KRB5-Ticket is expired. Sleep 1 seconds and hope it will be renewed after." >&2
+      # if (( counter == 10 )); then
       #   echo "try to renew KRB5-Ticket" >&2
       #   sudo -u "${USERNAME}" kinit -R -c "${KRB5CCNAME}"
-      echo "KRB5-Ticket is expired. Sleep 3 seconds and hope it will be renewed after." >&2
-      sleep 3
-    fi
+      # fi
+      sleep 1
+      ((counter++))
+    done
 
     echo "prepare mountpoints" >&2
     umask 0002