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