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-rw-r--r--debian/apt.apt-compat.cron.daily55
1 files changed, 55 insertions, 0 deletions
diff --git a/debian/apt.apt-compat.cron.daily b/debian/apt.apt-compat.cron.daily
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+++ b/debian/apt.apt-compat.cron.daily
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+#!/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 command -v on_ac_power >/dev/null; then
+ if on_ac_power; then
+ :
+ elif [ $? -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