live-build/helpers/lh_losetup

#!/bin/sh

# lh_losetup - wrapper around losetup
# Copyright (C) 2006-2007 Daniel Baumann <daniel@debian.org>
#
# live-helper comes with ABSOLUTELY NO WARRANTY; for details see COPYING.
# This is free software, and you are welcome to redistribute it
# under certain conditions; see COPYING for details.

set -e

# Including common functions
LH_BASE="${LH_BASE:-/usr/share/live-helper}"

for FUNCTION in "${LH_BASE}"/functions/*.sh
do
	. "${FUNCTION}"
done

# Setting static variables
DESCRIPTION="wrapper around losetup"
HELP=""
USAGE="${PROGRAM} DEVICE FILE [PARTITION]"

Arguments "${@}"

# Reading configuration files
Read_conffile config/common
Read_conffile config/bootstrap
Read_conffile config/chroot
Read_conffile config/binary
Read_conffile config/source
Read_conffile "${LH_CONFIG}"
Set_defaults

DEVICE="${1}"
FILE="${2}"
PARTITION="${3:=1}"

${LH_ROOT_COMMAND} ${LH_LOSETUP} "${DEVICE}" "${FILE}"
FDISK_OUT="`fdisk -l -u ${DEVICE} 2>&1`"
${LH_ROOT_COMMAND} ${LH_LOSETUP} -d "${DEVICE}"

LOOPDEVICE="`echo ${DEVICE}p${PARTITION}`"

if [ "${PARTITION}" = "0" ]
then
	Echo_message "Mounting ${DEVICE} with offset 0"

	${LH_ROOT_COMMAND} ${LH_LOSETUP} "${DEVICE}" "${FILE}"
else
	CYLINDERS="`echo "$FDISK_OUT" | sed -ne "s_^$LOOPDEVICE[ *]*\([0-9]*\).*_\1_p"`"
	OFFSET="`expr ${CYLINDERS} '*' 512`"

	Echo_message "Mounting ${DEVICE} with offset ${OFFSET}"

	${LH_ROOT_COMMAND} ${LH_LOSETUP} -o "${OFFSET}" "${DEVICE}" "${FILE}"
fi