relay-cmd

   1 #!/bin/bash
   2
   3 trap 'echo "$0:$LINENO:error: \"$BASH_COMMAND\" returned $?" >&2' ERR
   4
   5 usage() {
   6   cat <<EOF
   7 Usage: relay-cmd poweroff|poweron|reboot HOSTNAME|CHANNEL [RELAY_ID]
   8
   9 For CHANNEL and RELAY_ID, run hidusb-relay-cmd and hidusb-relay-cmd state.
  10 I recommend writing a config to use HOSTNAME instead. Config is /etc/relay-cmd.conf
  11 Example config:
  12
  13 # This config is just bash that gets sourced.
  14 # relay_id is not needed if only 1 relay is connected.
  15 cephserver3_channel=1
  16 cephserver3_relay_id=HURTM
  17 EOF
  18   exit $1
  19 }
  20
  21
  22 if (( $# < 2 )); then
  23   usage
  24 fi
  25
  26 read action chan relay_id  <<<"$@"
  27
  28 if [[ -e /etc/relay-cmd.conf ]]; then
  29   source /etc/relay-cmd.conf
  30 fi
  31
  32 if [[ $chan != [0-9]* ]]; then
  33   chan_var=${chan}_channel
  34   chan=${!chan_var}
  35   if [[ ! $chan ]]; then
  36     echo "error: channel not found in /etc/relay-cmd.conf" >&2
  37     exit 1
  38   fi
  39   if [[ ! $relay_id ]]; then
  40     relay_id_var=${chan}_relay_id
  41     relay=${!relay_id_var}
  42   fi
  43 fi
  44
  45
  46 if hidusb-relay-cmd state | grep ON; then
  47   printf "%s\n" "WARNING: output from hidusb-relay-cmd state shows an ON relay. this could mean another command instance is running, or it got stuck on due to an uncompleted command." >&2
  48 fi
  49
  50
  51 case $(hidusb-relay-cmd state|wc -l) in
  52   0)
  53     echo "error: got 0 lines from running hidusb-relay-cmd state" >&2
  54     exit 1
  55     ;;
  56   1) : ;;
  57   *)
  58     if [[ ! $relay_id ]]; then
  59       echo "error: more than 1 relay device, so passing its id is required" >&2
  60       exit 1
  61     fi
  62     ;;
  63 esac
  64
  65
  66 if [[ $relay_id ]]; then
  67   # leave this as an empty var if its not passed
  68   relay_id_arg="id=$relay_id"
  69 fi
  70
  71 # verbose command
  72 v() {
  73   printf "+ %s\n" "$*"
  74   "$@"
  75 }
  76
  77
  78 # ignore hup so we complete even if there is a connection problem.
  79 trap '' HUP
  80 echo "$0: doing $action. shell commands are printed to the terminal:"
  81 case $action in
  82   poweroff)
  83     v hidusb-relay-cmd $relay_id_arg on $chan
  84     v sleep 6
  85     v hidusb-relay-cmd $relay_id_arg off $chan
  86     ;;
  87   poweron)
  88     v hidusb-relay-cmd $relay_id_arg on $chan
  89     v sleep 1
  90     v hidusb-relay-cmd $relay_id_arg off $chan
  91     ;;
  92   reboot)
  93     v hidusb-relay-cmd $relay_id_arg on $chan
  94     v sleep 6
  95     v hidusb-relay-cmd $relay_id_arg off $chan
  96     v sleep 1
  97     v hidusb-relay-cmd $relay_id_arg on $chan
  98     v sleep 1
  99     v hidusb-relay-cmd $relay_id_arg off $chan
 100     ;;
 101   *)
 102     echo "error: action arg not supported" >&2
 103     exit 1
 104 esac
 105 echo "$0: script ended. exiting"