#!/bin/sh
#
# Auto-poweroff
#
timeup=3600
overtime=1800
lastlog=/var/local/ltime
zzzflg=/var/local/zzz
#
btime=`sed -e 's/btime  *//p;d' /proc/stat`
uptime=$(expr "$(cat /proc/uptime)" : '\([0-9]*\)')
ctime=$(expr ${btime} + ${uptime})
users=$(loginctl list-users --no-legend | wc -l)
pty=`cat /proc/sys/kernel/pty/nr`
tcp=`awk 'BEGIN {c = 0} {if ($4 == "01") c++} END {print c}' /proc/net/tcp`
cpu=`fgrep -c 'processor' /proc/cpuinfo`
loadavg=$(expr "$(cat /proc/loadavg)" : '\([0-9]*\)')
load=$(expr ${loadavg} / ${cpu})
zzz=$(test -f ${zzzflg} && echo 1 || echo 0)
#
if [ ${uptime} -le ${timeup} ]
then
  echo "Uptime is within the time limit.(${timeup}sec)" 1>&2
  if [ -f ${lastlog} ]
  then
    if [ -f ${zzzflg} ]
    then
      test ${zzzflg} -ot ${lastlog} && rm ${zzzflg}
    fi
    rm ${lastlog}
  fi
  exit 0
elif [ ${users} -eq 0 -a ${pty} -eq 0 -a ${tcp} -eq 0 -a ${load} -eq 0 -a ${zzz} -eq 1 ]
then
  ltime=$(<${lastlog})
  ltime=$(expr ${ltime} + ${overtime})
  test ${ctime} -le ${ltime} && exit 2
  echo "Power-off uptime=${uptime}/${timeup}s" | tee /dev/stderr | logger -t "auto-poweroff"
  test -f ${lastlog} && rm ${lastlog}
  test -f ${zzz} && rm ${zzz}
  /sbin/poweroff
else
  echo "Defer uptime=${uptime}/${timeup}s users=${users} pty=${pty} tcp=${tcp} loadavg=${loadavg}/${cpu} zzz=${zzz}" | tee /dev/stderr | logger -t "auto-poweroff"
  echo ${ctime} > ${lastlog}
  exit 2
fi

### END ###