aports - zzz.sh

 1#!/bin/sh
 2# zzz - really simple suspend script.
 3# Copied from void linux (licensed under public domain).
 4
 5# Fixed PATH, makes it a bit saner to allow execution of this via sudoers.
 6export PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
 7
 8USAGE="Usage: ${0##*/} [-nSzZR]
 9   -n   dry run (sleep for 5s instead of suspend/hibernate)
10   -S   Low-power idle (ACPI S0)
11   -z   suspend to RAM (ACPI S3) (default)
12   -Z   hibernate to disk & power off (ACPI S4)
13   -R   hibernate to disk & reboot"
14
15fail() { echo ${0##*/}: 1>&2 "$*"; exit 1; }
16
17export ZZZ_MODE=suspend
18export ZZZ_HIBERNATE_MODE=platform
19
20while getopts hnSzRZ: opt; do
21  case "$opt" in
22    n) ZZZ_MODE=noop ;;
23    S) ZZZ_MODE=standby ;;
24    z) ZZZ_MODE=suspend ;;
25    Z) ZZZ_MODE=hibernate ;;
26    R) ZZZ_MODE=hibernate; ZZZ_HIBERNATE_MODE=reboot ;;
27    *) fail "$USAGE" ;;
28  esac
29done
30shift $((OPTIND - 1))
31
32case "$ZZZ_MODE" in
33  suspend) grep -q mem /sys/power/state || fail "suspend not supported";;
34  hibernate) grep -q disk /sys/power/state || fail "hibernate not supported";;
35esac
36
37[ -w /sys/power/state ] || fail "sleep permission denied"
38
39(
40flock -n 9 || fail "another instance of zzz is running"
41
42case "$ZZZ_MODE" in
43  standby) printf freeze >/sys/power/state || fail "standby failed";;
44  suspend) printf mem >/sys/power/state || fail "suspend failed";;
45  hibernate)
46    echo $ZZZ_HIBERNATE_MODE >/sys/power/disk
47    printf disk >/sys/power/state || fail "hibernate failed";;
48  noop) sleep 5;;
49esac
50) 9</sys/power
51
52# vim: et:sw=2:sts=2