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Diffstat (limited to 'usb-and-pxe-installers/usbimg2disk.sh')
| -rw-r--r-- | usb-and-pxe-installers/usbimg2disk.sh | 278 |
1 files changed, 278 insertions, 0 deletions
diff --git a/usb-and-pxe-installers/usbimg2disk.sh b/usb-and-pxe-installers/usbimg2disk.sh new file mode 100644 index 000000000..d98e21de4 --- /dev/null +++ b/usb-and-pxe-installers/usbimg2disk.sh @@ -0,0 +1,278 @@ +#!/bin/sh +# $Id: usbimg2disk.sh,v 1.2 2009/05/14 10:29:38 eha Exp eha $ +# +# Copyright 2009 Eric Hameleers, Eindhoven, NL +# All rights reserved. +# +# Redistribution and use of this script, with or without modification, is +# permitted provided that the following conditions are met: +# +# 1. Redistributions of this script must retain the above copyright +# notice, this list of conditions and the following disclaimer. +# +# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED +# WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF +# MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO +# EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, +# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; +# OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, +# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR +# OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF +# ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + +# Paranoid as usual: +set -e + +showhelp() { + echo "# " + echo "# Purpose: to use the content of Slackware's usbboot.img and transform" + echo "# a standard USB thumb drive with a single vfat partition" + echo "# into an alternative USB boot device for the Slackware installer." + echo "# " + echo "# Reason: some computers refuse to boot from a USB thumb drive if it was" + echo "# made bootable by dumping 'usbboot.img' onto it." + echo "# " + echo "# Your USB thumb drive may contain data!" + echo "# This data will *not* be overwritten, unless you have" + echo "# explicitly chosen to format the drive by using the '-f' parameter." + echo "# " + echo "# $(basename $0) accepts the following parameters:" + echo "# -h|--help This help" + echo "# -f|--format Format the USB drive before use" + echo "# -i|--infile <filename> Full path to the usbboot.img file" + echo "# -l|--logfile <filename> Optional logfile to catch fdisk output" + echo "# -o|--outdev <filename> The device name of your USB drive" + echo "# -u|--unattended Do not ask any questions" + echo "# " + echo "# Example:" + echo "# " + echo "# $(basename $0) -i ~/download/usbboot.img -o /dev/sdX" + echo "# " +} + +reformat() { + # Commands to re-create a functional USB stick with VFAT partition: + # Only parameter: the name of the USB device to be formatted: + TOWIPE="$1" + + # Sanity checks: + if [ ! -b $TOWIPE ]; then + echo "*** Not a block device: '$TOWIPE' !" + exit 1 + fi + + # Wipe the MBR: + dd if=/dev/zero of=$TOWIPE bs=512 count=1 + + # create a FAT32 partition (type 'b') + /sbin/fdisk $TOWIPE <<EOF +n +p +1 + + +t +b +w +EOF + + # Format with a vfat filesystem: + /sbin/mkdosfs -F32 ${TOWIPE}1 +} + +makebootable() { + # Only parameter: the name of the USB device to be set bootable: + USBDRV="$1" + + # Sanity checks: + if [ ! -b $USBDRV ]; then + echo "Not a block device: '$USBDRV' !" + exit 1 + fi + + # Set the bootable flag for the first (and only...) partition: + /sbin/sfdisk $USBDRV -N1 <<EOF +,,,* +EOF +} + +# Parse the commandline parameters: +if [ -z "$1" ]; then + showhelp + exit 1 +fi +while [ ! -z "$1" ]; do + case $1 in + -f|--format) + REFORMAT=1 + shift + ;; + -h|--help) + showhelp + exit + ;; + -i|--infile) + USBIMG="$(cd $(dirname $2); pwd)/$(basename $2)" + shift 2 + ;; + -l|--logfile) + LOGFILE="$(cd $(dirname $2); pwd)/$(basename $2)" + shift 2 + ;; + -o|--outdev) + TARGET="$2" + TARGETPART="${TARGET}1" + shift 2 + ;; + -u|--unattended) + UNATTENDED=1 + shift + ;; + *) + echo "Unknown parameter '$1'!" + exit 1 + ;; + esac +done + +# Before we start: +[ -x /bin/id ] && CMD_ID="/bin/id" || CMD_ID="/usr/bin/id" +if [ "$($CMD_ID -u)" != "0" ]; then + echo "You need to be root to run $(basename $0)." + exit 1 +fi + +# Prepare the environment: +UNATTENDED=${UNATTENDED:-0} # unattended means: never ask questions. +REFORMAT=${REFORMAT:-0} # do not try to reformat by default +LOGFILE=${LOGFILE:-/dev/null} # silence by default + +# Sanity checks: +if [ -z "$TARGET" -o -z "$USBIMG" ]; then + echo "*** You must specify both the names of usbboot.img and the USB device!" + exit 1 +fi + +if [ ! -f $USBIMG ]; then + echo "*** This is not a useable file: '$USBIMG' !" + exit 1 +fi + +if [ $REFORMAT -eq 0 ]; then + if ! /sbin/blkid -t TYPE=vfat $TARGETPART 1>/dev/null 2>/dev/null ; then + echo "*** I fail to find a 'vfat' partition: '$TARGETPART' !" + echo "*** If you want to format the USB thumb drive, add the '-f' parameter." + exit 1 + fi +else + if [ ! -b $TARGET ]; then + echo "*** Not a block device: '$TARGET' !" + exit 1 + fi +fi + +if mount | grep -q $TARGETPART ; then + echo "***" + echo "*** Please un-mount $TARGETPART first, then re-run this script!" + echo "***" + exit 1 +fi + +# Check for prerequisites: +if [ ! -r /usr/lib/syslinux/mbr.bin -o ! -x /usr/bin/syslinux ]; then + echo "This script requires that the syslinux package is installed!" + exit 1 +fi + +# Show the USB device's information to the user: +if [ $UNATTENDED -eq 0 ]; then + [ $REFORMAT -eq 1 ] && DOFRMT="format and " || DOFRMT="" + + echo "" + echo "# We are going to ${DOFRMT}use this device - '$TARGET'." + /sbin/fdisk -l $TARGET | while read LINE ; do echo "# $LINE" ; done + echo "" + + echo "*** ***" + echo "*** If this is the wrong drive, then press CONTROL-C now! ***" + echo "*** ***" + + read -p "Or press ENTER to continue: " JUNK + # OK... the user was sure about the drive... +fi + +# Initialize the logfile: +cat /dev/null > $LOGFILE + +# If we need to format the USB drive, do it now: +if [ $REFORMAT -eq 1 ]; then + echo "--- Formatting $TARGET and creating VFAT partition..." + if [ $UNATTENDED -eq 0 ]; then + echo "--- Last chance! Press CTRL-C to abort!" + read -p "Or press ENTER to continue: " JUNK + fi + ( reformat $TARGET ) 1>>$LOGFILE 2>&1 +fi + +# Create a temporary mount point for the image file: +mkdir -p /mnt +MNTDIR1=$(mktemp -d -p /mnt -t img.XXXXXX) +if [ ! -d $MNTDIR1 ]; then + echo "*** Failed to create a temporary mount point for the image!" + exit 1 +else + chmod 700 $MNTDIR1 +fi + +# Create a temporary mount point for the USB thumb drive partition: +MNTDIR2=$(mktemp -d -p /mnt -t usb.XXXXXX) +if [ ! -d $MNTDIR2 ]; then + echo "*** Failed to create a temporary mount point for the usb thumb drive!" + exit 1 +else + chmod 700 $MNTDIR2 +fi + +# Mount the image file: +mount -o loop $USBIMG $MNTDIR1 + +# Mount the vfat partition +mount $TARGETPART $MNTDIR2 + +# Check available space: +USBFREE=$(df -k $TARGETPART | grep "^$TARGETPART" |tr -s ' ' | cut -d' ' -f4) +IMGSIZE=$(du -k $USBIMG | cut -f1) +echo "--- Available free space on the the USB drive is $USBFREE KB" +echo "--- Required free space: $IMGSIZE KB" + +# Exit when the image size appears larger than available space: +if [ $IMGSIZE -gt $USBFREE ]; then + echo "*** The USB thumb drive does not have enough free space!" + # Cleanup and exit: + umount -f $MNTDIR1 + umount -f $MNTDIR2 + rmdir $MNTDIR1 $MNTDIR2 + exit 1 +fi + +# Copy files to the USB disk in it's own subdirectory '/syslinux' +echo "--- Copying files to the USB drive..." +mkdir -p $MNTDIR2/syslinux +cp -a $MNTDIR1/* $MNTDIR2/syslinux/ +rm -f $MNTDIR2/syslinux/ldlinux.sys + +# Unmount everything: +umount -f $MNTDIR1 +umount -f $MNTDIR2 + +# Remove the temporary directories: +rmdir $MNTDIR1 $MNTDIR2 + +# Run syslinux and write a good MBR: +echo "--- Making the USB drive '$TARGET' bootable..." +( makebootable $TARGET ) 1>>$LOGFILE 2>&1 +/usr/bin/syslinux -s -d /syslinux $TARGETPART 1>>$LOGFILE 2>&1 +dd if=/usr/lib/syslinux/mbr.bin of=$TARGET 1>>$LOGFILE 2>&1 + +# THE END |