libremanage

   1 #!/bin/bash
   2
   3 trap 'echo "$0:$LINENO:error: \"$BASH_COMMAND\" returned $?" >&2' ERR
   4 set -eE -o pipefail
   5
   6 # verbose command
   7 v() {
   8   printf "$0 running: %s\n" "$*"
   9   "$@"
  10 }
  11
  12
  13 usage() {
  14   cat <<EOF
  15 Usage: libremanage poweroff|poweron|reboot HOSTNAME|CHANNEL [BOARD_ID]
  16
  17 BOARD_ID is not needed if only 1 relay device is connected.  To
  18 understand CHANNEL and BOARD_ID, run hidusb-relay-cmd and
  19 hidusb-relay-cmd state.
  20
  21 Using a configuration (/etc/libremanage.conf) allows you to use HOSTNAME
  22 instead of CHANNEL and BOARD_ID.
  23
  24 Note, the relay's channels default state when plugged in are off.
  25
  26 WARNING: If you lose access to the machine controlling a relay and a
  27 relay channel is stuck on, you will need to manually replug usb power to
  28 the relay so the channel goes back to its default off state before you
  29 can turn on the server it is connected to, because its as if the servers
  30 power button is stuck being held down. That is why this script runs
  31 locally and ignores signals when its running.
  32
  33 Example config:
  34
  35 # This config is sourced from bash, so make sure its valid bash.
  36 # board_id is not needed if only 1 relay device is connected.
  37 cephserver3_channel=1
  38 cephserver3_board_id=HURTM
  39 cephserver2_channel=2
  40 cephserver2_board_id=HURTM
  41
  42 EOF
  43   if [[ -e /etc/libremanage.conf ]]; then
  44     echo "Current config:"
  45     v cat /etc/libremanage.conf
  46   else
  47     echo "Note: /etc/libremanage.conf does not exist on the current machine"
  48   fi
  49   exit 0
  50 }
  51
  52
  53 if (( $# < 2 )); then
  54   usage
  55 fi
  56
  57 read action chan board_id  <<<"$@"
  58
  59 if [[ -e /etc/libremanage.conf ]]; then
  60   source /etc/libremanage.conf
  61 fi
  62
  63 # we know HOSTNAME is given if it doesn't start with a number.
  64 if [[ $chan != [0-9]* ]]; then
  65   if [[ ! $board_id ]]; then
  66     board_id_var=${chan}_board_id
  67     board_id=${!board_id_var}
  68   fi
  69   chan_var=${chan}_channel
  70   chan=${!chan_var}
  71
  72   if [[ ! $chan ]]; then
  73     echo "error: channel not found in /etc/libremanage.conf" >&2
  74     exit 1
  75   fi
  76 fi
  77
  78
  79 if hidusb-relay-cmd state | grep ON; then
  80   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
  81   # TODO: exit in this case and print out the command to turn it off.
  82 fi
  83
  84
  85 case $(hidusb-relay-cmd state|wc -l) in
  86   0)
  87     echo "error: got 0 lines from running hidusb-relay-cmd state" >&2
  88     exit 1
  89     ;;
  90   1) : ;;
  91   *)
  92     if [[ ! $board_id ]]; then
  93       echo "error: more than 1 relay device, so passing its id is required" >&2
  94       exit 1
  95     fi
  96     ;;
  97 esac
  98
  99
 100 if [[ $board_id ]]; then
 101   # leave this as an empty var if its not passed
 102   board_id_arg="id=$board_id"
 103 fi
 104
 105 # ignore errors and continue on if a command fails from here
 106 set +eE +o pipefail
 107 # ignore hup so we complete even if there is a connection problem, and
 108 # force anyone to kill -9 so we might complete in more cases, for
 109 # example if a reboot is happening
 110 trap '' HUP INT QUIT TERM
 111 echo "$0: doing $action. shell commands will be printed to the terminal."
 112 case $action in
 113   poweroff)
 114     v hidusb-relay-cmd $board_id_arg on $chan
 115     v sleep 6
 116     v hidusb-relay-cmd $board_id_arg off $chan
 117     ;;
 118   poweron)
 119     v hidusb-relay-cmd $board_id_arg on $chan
 120     v sleep 1
 121     v hidusb-relay-cmd $board_id_arg off $chan
 122     ;;
 123   reboot)
 124     v hidusb-relay-cmd $board_id_arg on $chan
 125     v sleep 6
 126     v hidusb-relay-cmd $board_id_arg off $chan
 127     v sleep 1
 128     v hidusb-relay-cmd $board_id_arg on $chan
 129     v sleep 1
 130     v hidusb-relay-cmd $board_id_arg off $chan
 131     ;;
 132   *)
 133     echo "error: action arg not supported" >&2
 134     exit 1
 135 esac
 136 echo "$0: script ended. exiting"