freebsd-skq/release/amd64/make-memstick.sh
gjb ea7f4bcbda Prevent memstick installation medium from attempting to mount
the root filesystem read-write.  This causes problems booting
the memstick installation medium from write-protected USB flash
drives.

Submitted by:	A.J. Kehoe IV [1], Oliver Jones [2]
PR:		187161 [1], 205886 [2]
MFC after:	1 week
Sponsored by:	The FreeBSD Foundation
2016-01-05 03:20:45 +00:00

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#!/bin/sh
#
# This script generates a "memstick image" (image that can be copied to a
# USB memory stick) from a directory tree. Note that the script does not
# clean up after itself very well for error conditions on purpose so the
# problem can be diagnosed (full filesystem most likely but ...).
#
# Usage: make-memstick.sh <directory tree> <image filename>
#
# $FreeBSD$
#
PATH=/bin:/usr/bin:/sbin:/usr/sbin
export PATH
if [ $# -ne 2 ]; then
echo "make-memstick.sh /path/to/directory /path/to/image/file"
exit 1
fi
if [ ! -d ${1} ]; then
echo "${1} must be a directory"
exit 1
fi
if [ -e ${2} ]; then
echo "won't overwrite ${2}"
exit 1
fi
echo '/dev/ufs/FreeBSD_Install / ufs ro,noatime 1 1' > ${1}/etc/fstab
echo 'root_rw_mount="NO"' > ${1}/etc/rc.conf.local
makefs -B little -o label=FreeBSD_Install ${2}.part ${1}
if [ $? -ne 0 ]; then
echo "makefs failed"
exit 1
fi
rm ${1}/etc/fstab
rm ${1}/etc/rc.conf.local
mkimg -s gpt -b ${1}/boot/pmbr -p efi:=${1}/boot/boot1.efifat -p freebsd-boot:=${1}/boot/gptboot -p freebsd-ufs:=${2}.part -p freebsd-swap::1M -o ${2}
rm ${2}.part