debian/apt.apt-compat.cron.daily

   1 #!/bin/sh
   2
   3 set -e
   4
   5 # Systemd systems use a systemd timer unit which is preferable to
   6 # run. We want to randomize the apt update and unattended-upgrade
   7 # runs as much as possible to avoid hitting the mirrors all at the
   8 # same time. The systemd time is better at this than the fixed
   9 # cron.daily time
  10 if [ -d /run/systemd/system ]; then
  11     exit 0
  12 fi
  13
  14 # sleep for a random interval of time (default 30min)
  15 # (some code taken from cron-apt, thanks)
  16 random_sleep()
  17 {
  18     RandomSleep=1800
  19     eval $(apt-config shell RandomSleep APT::Periodic::RandomSleep)
  20     if [ $RandomSleep -eq 0 ]; then
  21         return
  22     fi
  23     if [ -z "$RANDOM" ] ; then
  24         # A fix for shells that do not have this bash feature.
  25         RANDOM=$(( $(dd if=/dev/urandom bs=2 count=1 2> /dev/null | cksum | cut -d' ' -f1) % 32767 ))
  26     fi
  27     TIME=$(($RANDOM % $RandomSleep))
  28     sleep $TIME
  29 }
  30
  31 # run daily job
  32 random_sleep
  33 exec /usr/lib/apt/apt.systemd.daily