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#!/bin/bash
#
# mkusbimg - creates a bootable disk image
# Copyright (C) 2008 Simo Leone <simo@archlinux.org>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
# usage(exitvalue)
# outputs a usage message and exits with value
APPNAME=$(basename "${0}")
usage()
{
echo "usage: ${APPNAME} <imageroot> <imagefile>"
exit $1
}
##################################################
if [ $# -ne 2 ]; then
usage 1
fi
DISKIMG="${2}"
IMGROOT="${1}"
TMPDIR=$(mktemp -d)
FSIMG=$(mktemp)
# ext2 overhead's upper bound is 6%
# empirically tested up to 1GB
rootsize=$(du -bs ${IMGROOT}|cut -f1)
IMGSZ=$(( (${rootsize}*106)/100/512 + 1)) # image size in sectors
# create the filesystem image file
dd if=/dev/zero of="$FSIMG" bs=512 count="$IMGSZ"
# create a filesystem on the image
mke2fs -m 0 -F "$FSIMG"
# mount the filesystem and copy data
modprobe loop
mount -o loop "$FSIMG" "$TMPDIR"
cp -a "$IMGROOT"/* "$TMPDIR"
# unmount filesystem
umount "$TMPDIR"
# add sectors 0-62, then glue together
dd if=/dev/zero of="$DISKIMG" bs=512 count=63
cat "$FSIMG" >> "$DISKIMG"
# create a partition table
# if this looks like voodoo, it's because it is
sfdisk -uS -f "$DISKIMG" << EOF
63,$IMGSZ,83,*
0,0,00
0,0,00
0,0,00
EOF
# install grub on the image
grub --no-floppy --batch << EOF
device (hd0) $DISKIMG
root (hd0,0)
setup (hd0)
EOF
# all done :)
rm -fr "$TMPDIR" "$FSIMG"
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