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|
#!/bin/bash
default_capacity_threshold=50
capacity_threshold_file=$HOME/.config/powerloss-handler/capacity_threshold
battery_dir=/sys/class/power_supply/BAT0
status_file=$battery_dir/status
capacity_file=$battery_dir/capacity
UNIT=powerloss-handler
CMD=$0
FORCE_SUSPEND=
self_install()
{
if systemctl --user is-active "$UNIT" >/dev/null
then
systemctl --user stop "$UNIT"
fi
systemctl --user reset-failed "$UNIT" 2>/dev/null
systemd-run --user \
--unit "$UNIT" \
--property Restart="on-failure" \
-- "$CMD"
}
self_test()
{
FORCE_SUSPEND=y
go
echo
}
do_suspend()
{
systemctl suspend
}
go()
{
read capacity < "$capacity_file" || return
case "$capacity" in
'' | *[^0-9]*)
echo "Error: unexpected value for battery capacity: $capacity" >&2
return 1 ;;
esac
read status < "$status_file" || return
if [ "$FORCE_SUSPEND" ]
then
status=Discharging
capacity=0
echo 'Warning: test: pretending battery is discharging at 0% capacity' >&2
fi
if [ -t 2 ]
then
printf '\r %20s %.2d%%\r' "$status" "$capacity" >&2
fi
if [ -f "$capacity_threshold_file" ]
then
read capacity_threshold < "$capacity_threshold_file"
else
capacity_threshold=$default_capacity_threshold
fi
[ "$status" = Discharging ] || return 0
if [ "$capacity" -lt "$capacity_threshold" ]
then
do_suspend
fi
}
main()
{
if [ -e /usr/lib/bash/sleep ]
then
enable -f /usr/lib/bash/sleep sleep
else
echo 'Warning: not found: /usr/lib/bash/sleep (try: "sudo apt install bash-builtins")' >&2
fi
while true
do
go
sleep 1
done
}
if [ $# = 0 ]
then
main
else
case "$1" in
run) main ;;
install) self_install ;;
test) self_test ;;
*) echo "Error: unknown command: $*" >&2
echo "Valid commands: run install test" >&2
exit 1
;;
esac
fi
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