utils/watchcat/files/watchcat.sh

   1 #!/bin/sh
   2
   3 mode="$1"
   4
   5 shutdown_now() {
   6         local forcedelay="$1"
   7
   8         reboot &
   9
  10         [ "$forcedelay" -ge 1 ] && {
  11                 sleep "$forcedelay"
  12
  13                 echo b > /proc/sysrq-trigger # Will immediately reboot the system without syncing or unmounting your disks.
  14         }
  15 }
  16
  17 watchcat_allways() {
  18         local period="$1"; local forcedelay="$2"
  19
  20         sleep "$period" && shutdown_now "$forcedelay"
  21 }
  22
  23 watchcat_ping() {
  24         local period="$1"; local forcedelay="$2"; local pinghosts="$3"; local pingperiod="$4"
  25
  26         time_now="$(cat /proc/uptime)"
  27         time_now="${time_now%%.*}"
  28         time_last="$time_now"
  29
  30         while true
  31         do
  32                 sleep "$pingperiod"
  33
  34                 time_now="$(cat /proc/uptime)"
  35                 time_now="${time_now%%.*}"
  36
  37                 for host in "$pinghosts"
  38                 do
  39                         if ping -c 1 "$host" &> /dev/null
  40                         then
  41                                 time_last="$time_now"
  42                         else
  43                                 time_diff="$((time_now-time_last))"
  44                                 logger -p daemon.info -t "watchcat[$$]" "no internet connectivity for $time_diff seconds. Reseting when reaching $period"
  45                         fi
  46                 done
  47
  48                 time_diff="$((time_now-time_last))"
  49                 [ "$time_diff" -ge "$period" ] && shutdown_now "$forcedelay"
  50
  51         done
  52 }
  53
  54         if [ "$mode" = "allways" ]
  55         then
  56                 watchcat_allways "$2" "$3"
  57         else
  58                 watchcat_ping "$2" "$3" "$4" "$5"
  59         fi