freebsd-dev/release/i386/make-memstick.sh
Ed Maste bf249c5a0a switch i386 memstick installer images to MBR
Some BIOSes have trouble booting from GPT in non-UEFI mode.  This is
commonly reported with Lenovo laptops, including my x220.  As we do not
currently support booting FreeBSD/i386 via UEFI there's no reason to
prefer GPT.

The "vestigial swap partition" was added in r265017 to work around an
issue with loader's GPT support, so we should not need it when using
MBR.

We may want to make the same change to amd64, although the issue there is
mitigated by such systems booting via UEFI in the common case.

PR:		227422
Reviewed by:	gjb
MFC after:	3 weeks
Relnotes:	Yes
Sponsored by:	The FreeBSD Foundation
2018-04-12 19:00:22 +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>
#
# $FreeBSD$
#
set -e
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 -o version=2 ${2}.part ${1}
rm ${1}/etc/fstab
rm ${1}/etc/rc.conf.local
mkimg -s mbr \
-b ${1}/boot/mbr \
-p freebsd:-"mkimg -s bsd -b ${1}/boot/boot -p freebsd-ufs:=${2}.part" \
-o ${2}
rm ${2}.part