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#!/bin/sh
# lh_losetup <device> <file> <partition>
if [ -z "${1}" ]
then
DEVICE="`losetup -f`"
else
DEVICE="${1}"
fi
FILE="${2}"
PARTITION="${3}"
losetup "${DEVICE}" "${FILE}"
FDISK_OUT="`fdisk -l -u ${DEVICE} 2>&1`"
losetup -d "${DEVICE}"
LOOPDEVICE="`echo ${DEVICE}p${PARTITION:=1}`"
CYL=`echo "$FDISK_OUT" | sed -ne "s_^$LOOPDEVICE[ *]*\([0-9]*\).*_\1_p"`
#OFFSET="`expr 512 '*' ${CYL}`"
OFFSET="$((CYL*512))"
echo loop $DEVICE at offset $OFFSET
if [ "${PARTITION}" = "0" ]
then
losetup "${DEVICE}" "${FILE}"
else
losetup -o "${OFFSET}" "${DEVICE}" "${FILE}"
fi
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