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