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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/>.
# next_avail_loop()
# prints the next available loopback device
# returns 0 on success
# 1 on failure
# XXX: this is only necessary because
# the cryptoloop patch for losetup
# destroys losetup -f
next_avail_loop()
{
for i in /dev/loop/*; do
echo $(losetup -a|cut -d':' -f1) | grep -q $i
if [ $? -eq 1 ]; then
echo $i
return 0
fi
done
return 1
}
# usage(exitvalue)
# outputs a usage message and exits with value
APPNAME=$(basename "${0}")
usage()
{
echo "usage: ${APPNAME} <imageroot> <imagefile>"
exit $1
}
##################################################
if [ $# -ne 2 ]; then
usage 1
fi
IMG="${2}"
IMGROOT="${1}"
LOOPDEV=$(next_avail_loop)
TMPDIR=$(mktemp -d)
# TODO: there are better ways to do this
# than adding 25% to the rootsize
# XXX: doesn't seem to boot if we cut it too
# close. even if everything fits...
# IMGSZ >= filesystem overhead + rootsize + 512bytes
# must hold or there will be insufficient space
rootsize=$(du -bs ${IMGROOT}|cut -f1)
IMGSZ=$(( (${rootsize}*5)/4 + 512 ))
# create the image file
dd if=/dev/zero of="$IMG" bs="$IMGSZ" count=1
# loop mount the disk image
losetup "$LOOPDEV" "$IMG"
# create a partition table
# if this looks like voodoo, it's because it is
echo "63,,,*,"|sfdisk -uS "$LOOPDEV"
# loop mount the partition we just made
# that magic number (offset in bytes to first partition) is more voodoo
losetup -d "$LOOPDEV"
losetup -o32256 "$LOOPDEV" "$IMG"
# create a filesystem on our partition
mke2fs -m 0 "$LOOPDEV"
# mount the filesystem and copy data
mount "$LOOPDEV" "$TMPDIR"
cp -a "$IMGROOT"/* "$TMPDIR"
# unmount filesystem and loopback
umount "$TMPDIR"
losetup -d "$LOOPDEV"
# install grub on the image
grub --no-floppy --batch << EOF
device (hd0) $IMG
root (hd0,0)
setup (hd0)
EOF
# all done :)
rm -fr "$TMPDIR"
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