utils/svc_wrapper.sh

   1 #!/bin/bash
   2
   3 # `snapctl get services` returns a JSON array, example:
   4 #{
   5 #"n6801": {
   6 #   "listen": 6801,
   7 #   "vnc": "localhost:5901"
   8 #},
   9 #"n6802": {
  10 #    "listen": 6802,
  11 #   "vnc": "localhost:5902"
  12 #}
  13 #}
  14 snapctl get services | jq -c '.[]' | while read service; do # for each service the user sepcified..
  15     # get the important data for the service (listen port, VNC host:port)
  16     listen_port="$(echo $service | jq --raw-output '.listen')"
  17     vnc_host_port="$(echo $service | jq --raw-output '.vnc')" # --raw-output removes any quotation marks from the output
  18
  19     # check whether those values are valid
  20     expr "$listen_port" : '^[0-9]\+$' > /dev/null
  21     listen_port_valid=$?
  22     if [ ! $listen_port_valid ] || [ -z "$vnc_host_port" ]; then
  23         # invalid values mean the service is disabled, do nothing except for printing a message (logged in /var/log/system or systemd journal)
  24         echo "novnc: not starting service ${service} with listen_port ${listen_port} and vnc_host_port ${vnc_host_port}"
  25     else
  26         # start (and fork with '&') the service using the specified listen port and VNC host:port
  27         $SNAP/utils/launch.sh --listen $listen_port --vnc $vnc_host_port &
  28     fi
  29 done