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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
BLOCKSIZE=10240
if [ $# -ne 2 ]; then
echo "make-memstick.sh /path/to/directory /path/to/image/file"
exit 1
fi
tempfile="${2}.$$"
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/gpt/FreeBSD_Install / ufs rw,noatime 1 1' > ${1}/etc/fstab
rm -f ${tempfile}
makefs -B little ${tempfile} ${1}
if [ $? -ne 0 ]; then
echo "makefs failed"
exit 1
fi
rm ${1}/etc/fstab
#
# Use $BLOCKSIZE for transfers to improve efficiency. When calculating
# how many blocks to transfer "+ 2" is to account for truncation in the
# division and to provide space for the label.
#
filesize=`stat -f "%z" ${tempfile}`
blocks=$(($filesize / ${BLOCKSIZE} + 256))
dd if=/dev/zero of=${2} bs=${BLOCKSIZE} count=${blocks}
if [ $? -ne 0 ]; then
echo "creation of image file failed"
exit 1
fi
unit=`mdconfig -a -t vnode -f ${2}`
if [ $? -ne 0 ]; then
echo "mdconfig failed"
exit 1
fi
gpart create -s GPT ${unit}
gpart add -t freebsd-boot -s 64K ${unit}
gpart bootcode -b ${1}/boot/pmbr -p ${1}/boot/gptboot -i 1 ${unit}
gpart add -t freebsd-ufs -l FreeBSD_Install ${unit}
dd if=${tempfile} of=/dev/${unit}p2 bs=$BLOCKSIZE conv=sync
if [ $? -ne 0 ]; then
echo "copying filesystem into image file failed"
exit 1
fi
mdconfig -d -u ${unit}
rm -f ${tempfile}
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