- #!/bin/sh
- #
- # Copyright (C) 2010 segal.di.ubi.pt
- #
- # This is free software, licensed under the GNU General Public License v2.
- #
-
- reboot_now() {
- reboot &
-
- [ "$1" -ge 1 ] && {
- sleep "$1"
- echo 1 > /proc/sys/kernel/sysrq
- echo b > /proc/sysrq-trigger # Will immediately reboot the system without syncing or unmounting your disks.
- }
- }
-
- watchcat_always() {
- local period="$1"; local forcedelay="$2"
-
- sleep "$period" && reboot_now "$forcedelay"
- }
-
- watchcat_ping() {
- local period="$1"; local forcedelay="$2"; local pinghosts="$3"; local pingperiod="$4"; local nopingtime="$5"
-
- local time_now="$(cat /proc/uptime)";time_now="${time_now%%.*}"
-
- [ "$time_now" -lt "$nopingtime" ] && sleep "$((nopingtime-time_now))"
-
- time_now="$(cat /proc/uptime)";time_now="${time_now%%.*}"
- local time_lastcheck="$time_now"
- local time_lastcheck_withinternet="$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%%.*}"
- local time_diff="$((time_now-time_lastcheck))"
-
- [ "$time_diff" -lt "$pingperiod" ] && sleep "$((pingperiod-time_diff))"
-
- 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
- logger -p daemon.info -t "watchcat[$$]" "no internet connectivity for $((time_now-time_lastcheck_withinternet)). Reseting when reaching $period"
- fi
- done
-
- [ "$((time_now-time_lastcheck_withinternet))" -ge "$period" ] && reboot_now "$forcedelay"
- done
- }
-
- if [ "$1" = "always" ]
- then
- watchcat_always "$2" "$3"
- else
- watchcat_ping "$2" "$3" "$4" "$5" "$6"
- fi
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