You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
56 lines
1.4 KiB
Plaintext
56 lines
1.4 KiB
Plaintext
7 years ago
|
#!/bin/sh
|
||
|
|
|
||
|
|
set -e
|
||
|
|
|
||
|
|
# Systemd systems use a systemd timer unit which is preferable to
|
||
|
|
# run. We want to randomize the apt update and unattended-upgrade
|
||
|
|
# runs as much as possible to avoid hitting the mirrors all at the
|
||
|
|
# same time. The systemd time is better at this than the fixed
|
||
|
|
# cron.daily time
|
||
|
|
if [ -d /run/systemd/system ]; then
|
||
|
|
exit 0
|
||
|
|
fi
|
||
|
|
|
||
|
|
check_power()
|
||
|
|
{
|
||
|
|
# laptop check, on_ac_power returns:
|
||
|
|
# 0 (true) System is on main power
|
||
|
|
# 1 (false) System is not on main power
|
||
|
|
# 255 (false) Power status could not be determined
|
||
|
|
# Desktop systems always return 255 it seems
|
||
|
|
if which on_ac_power >/dev/null 2>&1; then
|
||
|
|
on_ac_power
|
||
|
|
POWER=$?
|
||
|
|
if [ $POWER -eq 1 ]; then
|
||
|
|
return 1
|
||
|
|
fi
|
||
|
|
fi
|
||
|
|
return 0
|
||
|
|
}
|
||
|
|
|
||
|
|
# sleep for a random interval of time (default 30min)
|
||
|
|
# (some code taken from cron-apt, thanks)
|
||
|
|
random_sleep()
|
||
|
|
{
|
||
|
|
RandomSleep=1800
|
||
|
|
eval $(apt-config shell RandomSleep APT::Periodic::RandomSleep)
|
||
|
|
if [ $RandomSleep -eq 0 ]; then
|
||
|
|
return
|
||
|
|
fi
|
||
|
|
if [ -z "$RANDOM" ] ; then
|
||
|
|
# A fix for shells that do not have this bash feature.
|
||
|
|
RANDOM=$(( $(dd if=/dev/urandom bs=2 count=1 2> /dev/null | cksum | cut -d' ' -f1) % 32767 ))
|
||
|
|
fi
|
||
|
|
TIME=$(($RANDOM % $RandomSleep))
|
||
|
|
sleep $TIME
|
||
|
|
}
|
||
|
|
|
||
|
|
# delay the job execution by a random amount of time
|
||
|
|
random_sleep
|
||
|
|
|
||
|
|
# ensure we don't do this on battery
|
||
|
|
check_power || exit 0
|
||
|
|
|
||
|
|
# run daily job
|
||
|
|
exec /usr/lib/apt/apt.systemd.daily
|