#! /bin/sh
#
# Preserve the random seed between reboots. See urandom(4).
#
# This script can be called multiple times during operation (e.g. with
# "reload" argument) to refresh the seed.

# The following arguments can be added to SEEDRNG_ARGS in
# /etc/default/seedrng:
#   --seed-dir=/path/to/seed/directory
#     Path to the directory where the seed and the lock files are stored.
#     for optimal operation, this should be a persistent, writeable
#     location. Default is /var/lib/seedrng
#
#  --skip-credit
#     Set this to true only if you do not want seed files to actually
#     credit the RNG, for example if you plan to replicate this file
#     system image and do not have the wherewithal to first delete the
#     contents of /var/lib/seedrng.
#
# Example:
# SEEDRNG_ARGS="--seed-dir=/data/seedrng --skip-credit"
#

DAEMON="seedrng"
SEEDRNG_ARGS=""

# shellcheck source=/dev/null
[ -r "/etc/default/$DAEMON" ] && . "/etc/default/$DAEMON"

case "$1" in
	start|stop|restart|reload)
		# Never fail, as this isn't worth making a fuss
		# over if it doesn't go as planned.
		# shellcheck disable=SC2086 # we need the word splitting
		seedrng $SEEDRNG_ARGS || true;;
	*)
		echo "Usage: $0 {start|stop|restart|reload}"
		exit 1
esac