init/random.conf

   1 description "Save random entropy on shutdown and restore it at boot time"
   2
   3 start on pld.sysinit-done
   4 stop on pld.shutdown-started
   5
   6 env SEED_FILE=/var/run/random-seed
   7
   8 pre-start script
   9         poolfile=/proc/sys/kernel/random/poolsize
  10         [ -r $poolfile ] && bytes="$(cat $poolfile)" || bytes=512
  11         if [ -f $SEED_FILE ]; then
  12                 cat $SEED_FILE >/dev/urandom
  13         else
  14                 touch $SEED_FILE
  15         fi
  16         chmod 600 $SEED_FILE
  17         dd if=/dev/urandom of=$SEED_FILE count=1 bs=$bytes 2>/dev/null
  18 end script
  19
  20 post-stop script
  21         poolfile=/proc/sys/kernel/random/poolsize
  22         [ -r $poolfile ] && bytes="$(cat $poolfile)" || bytes=512
  23         touch $SEED_FILE
  24         chmod 600 $SEED_FILE
  25         dd if=/dev/urandom of=$SEED_FILE count=1 bs=$bytes 2>/dev/null
  26 end script
  27