|
|
- #!/bin/sh
- #
- # Copyright (C) 2010 segal.di.ubi.pt
- #
- # This is free software, licensed under the GNU General Public License v2.
- #
-
- mode="$1"
-
- shutdown_now() {
- local forcedelay="$1"
-
- reboot &
-
- [ "$forcedelay" -ge 1 ] && {
- sleep "$forcedelay"
-
- echo b > /proc/sysrq-trigger # Will immediately reboot the system without syncing or unmounting your disks.
- }
- }
-
- watchcat_allways() {
- local period="$1"; local forcedelay="$2"
-
- sleep "$period" && shutdown_now "$forcedelay"
- }
-
- watchcat_ping() {
- local period="$1"; local forcedelay="$2"; local pinghosts="$3"; local pingperiod="$4"
-
- time_now="$(cat /proc/uptime)"
- time_now="${time_now%%.*}"
- time_lastcheck="$time_now"
- time_lastcheck_withinternet="$time_now"
-
- while true
- do
- # account for the time ping took to return. With a ping time of 5s, ping might take more than that, so it is important to avoid even more delay.
- time_now="$(cat /proc/uptime)"
- time_now="${time_now%%.*}"
- time_diff="$((time_now-time_lastcheck))"
-
- [ "$time_diff" -lt "$pingperiod" ] && {
- sleep_time="$((pingperiod-time_diff))"
- sleep "$sleep_time"
- }
-
- time_now="$(cat /proc/uptime)"
- time_now="${time_now%%.*}"
- time_lastcheck="$time_now"
-
- for host in "$pinghosts"
- do
- if ping -c 1 "$host" &> /dev/null
- then
- time_lastcheck_withinternet="$time_now"
- else
- time_diff="$((time_now-time_lastcheck_withinternet))"
- logger -p daemon.info -t "watchcat[$$]" "no internet connectivity for $time_diff seconds. Reseting when reaching $period"
- fi
- done
-
- time_diff="$((time_now-time_lastcheck_withinternet))"
- [ "$time_diff" -ge "$period" ] && shutdown_now "$forcedelay"
-
- done
- }
-
- if [ "$mode" = "allways" ]
- then
- watchcat_allways "$2" "$3"
- else
- watchcat_ping "$2" "$3" "$4" "$5"
- fi
|
