20-propagator-rescue-hash-grub

#!/bin/sh
# postprocess grub configuration
# to add rescue image hash, if any
# (for propagator in forensic mode)

cd "$WORKDIR"
cfg='boot/grub/grub.cfg'

[ -f "$cfg" ] || exit 0

find -maxdepth 1 -type f -name rescue \
| while read image; do
	rescue_hash="$(sha256sum -b "$image" | cut -f1 -d' ')"
	sed -i "s,@rescue_hash@,$rescue_hash," $cfg
done