97ed563f00
mkusbimg creates bootable raw disk images that can be written to USB devices. It's intended to be on the same functional level as mkisofs. Signed-off-by: Simo Leone <simo@archlinux.org>
99 lines
2.5 KiB
Bash
Executable File
99 lines
2.5 KiB
Bash
Executable File
#!/bin/bash
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#
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# mkusbimg - creates a bootable disk image
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# Copyright (C) 2008 Simo Leone <simo@archlinux.org>
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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# next_avail_loop()
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# prints the next available loopback device
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# returns 0 on success
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# 1 on failure
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# XXX: this is only necessary because
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# the cryptoloop patch for losetup
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# destroys losetup -f
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next_avail_loop()
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{
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for i in /dev/loop/*; do
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echo `losetup -a|cut -d':' -f1` | grep -q $i
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if [ $? -eq 1 ]; then
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echo $i
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return 0
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fi
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done
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return 1
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}
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# usage(exitvalue)
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# outputs a usage message and exits with value
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APPNAME=$(basename "${0}")
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usage()
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{
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echo "usage: ${APPNAME} <imageroot> <imagefile>"
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exit $1
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}
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##################################################
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if [ $# -ne 2 ]; then
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usage 1
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fi
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IMG="${2}"
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IMGROOT="${1}"
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LOOPDEV=$(next_avail_loop)
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TMPDIR=$(mktemp -d)
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# TODO: there are better ways to do this
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# than adding 5MB to the rootsize
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# IMGSZ >= filesystem overhead + rootsize + 512bytes
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# must hold or there will be insufficient space
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IMGSZ=$(( $(du -ms ${IMGROOT}|cut -f1) + 5 ))
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# create the image file
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dd if=/dev/zero of="$IMG" bs=1M count="$IMGSZ"
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# loop mount the disk image
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losetup "$LOOPDEV" "$IMG"
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# create a partition table
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# if this looks like voodoo, it's because it is
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echo "63,,,*,"|sfdisk -uS "$LOOPDEV"
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# loop mount the partition we just made
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# that magic number (offset in bytes to first partition) is more voodoo
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losetup -d "$LOOPDEV"
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losetup -o32256 "$LOOPDEV" "$IMG"
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# create a filesystem on our partition
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mke2fs -m 0 "$LOOPDEV"
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# mount the filesystem and copy data
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mount "$LOOPDEV" "$TMPDIR"
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cp -a "$IMGROOT"/* "$TMPDIR"
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# unmount filesystem and loopback
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umount "$TMPDIR"
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losetup -d "$LOOPDEV"
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# install grub on the image
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grub --no-floppy --batch << EOF
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device (hd0) $IMG
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root (hd0,0)
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setup (hd0)
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EOF
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# all done :)
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rm -fr "$TMPDIR"
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