UNIX for Advanced & Expert Users

mount-img <image-file> <partition-number> <mount-point>

#!/bin/sh

eval MI_IMAGE="$1"

if [ ! -e "$MI_IMAGE" ]; then
   echo "${0##*/}: No such file or directory"
   exit
elif [ -d "$MI_IMAGE" ]; then
   echo "$1: Is a directory"
   exit
elif [ ! "$2" ]; then
   echo "${0##*/}: partition number not specified"
   exit
elif [ ! "$2" -ge "1" 2>/dev/null ]; then
   echo "${0##*/}: invalid partition number"
   exit
fi

MI_PART=$(( $2 + 1 ))
MI_INFO=`/sbin/fdisk -ul "$MI_IMAGE" 2>/dev/null | grep -E "Sector size \(logical/physical\):|^$MI_IMAGE"`
MI_SECTOR="${MI_INFO#*: }"
MI_SECTOR="${MI_SECTOR%% bytes*}"

if [ "$MI_PART" -gt "`echo "$MI_INFO" | wc -l`" ]; then
   echo "${0##*/}: partition number too high"
   exit
elif [ ! "$3" ]; then
   echo "${0##*/}: mount point not specified"
   exit
elif [ ! -e "$3" ]; then
   echo "${0##*/}: mount point $3 does not exist"
   exit
elif [ ! -d "$3" ]; then
   echo "${0##*/}: mount point $3 is not a directory"
   exit
fi

MI_OPTS=`echo "$MI_INFO" | awk -v l="$MI_PART" 'NR==l {printf "%s/%s",$(NF-4),$(NF-3)}'`
MI_OFFSET=$(( ${MI_OPTS%/*} * $MI_SECTOR  ))
MI_LIMIT=$(( (${MI_OPTS#*/} - ${MI_OPTS%/*}) * $MI_SECTOR  ))
mount -o loop,offset=$MI_OFFSET,sizelimit=$MI_LIMIT "$1" "$3"

elif [ ! "$3" ]; then