#!/bin/sh
#
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# $FreeBSD: stable/11/sys/tools/embed_mfs.sh 312082 2017-01-13 19:22:22Z lwhsu $ 
#
# Embed the MFS image into the kernel body (expects space reserved via 
# MD_ROOT_SIZE)
#
# $1: kernel filename
# $2: MFS image filename
#

setglobal mfs_size = $[stat -f '%z' $2 !2 > /dev/null]
# If we can't determine MFS image size - bail.
test -z $(mfs_size) && echo "Can't determine MFS image size" && exit 1

setglobal sec_info = $[elfdump -c $1 !2 > /dev/null | grep -A 5 -E "sh_name: oldmfs$]
# If we can't find the mfs section within the given kernel - bail.
test -z $(sec_info) && echo "Can't locate mfs section within kernel" && exit 1

setglobal sec_size = $[echo $(sec_info) | awk '/sh_size/ {print $2}' !2 > /dev/null]
setglobal sec_start = $[echo $(sec_info) | awk '/sh_offset/ {print $2}' !2 > /dev/null]

# If the mfs section size is smaller than the mfs image - bail.
test $(sec_size) -lt $(mfs_size) && echo "MFS image too large" && exit 1

# Dump the mfs image into the mfs section
dd if=$2 ibs=8192 of=$1 obs=$(sec_start) oseek=1 conv=notrunc !2 > /dev/null && \
    echo "MFS image embedded into kernel" && exit 0