rpimount

#!/bin/bash

set -e

basedir=$(cd $(dirname $0) && pwd)
mountpoint=

export PATH=$basedir:$PATH

function _cleanup {
    if test -n "$mountpoint"; then
	mount | grep -q $mountpoint/boot && \
	    $su umount $mountpoint/boot
	mount | grep -q $mountpoint && \
	    $su umount $mountpoint
    fi
}

function _usage {
    echo "Usage: $0 [-s,-h] /path/to/img mountpoint"
    echo -e "\t-s:    start a shell"
    echo -e "\t-h:    display help"
}

function _mount {
    i=$1
    $su mount -o offset=$(blkoffset $image 2),ro -t ext4 $image $mountpoint
    $su mount -o offset=$(blkoffset $image 1),ro -t vfat $image $mountpoint/boot
}

shell=
while getopts ":s" opt; do
    case $opt in
	s)
	    trap _cleanup EXIT
	    shell=1
	    shift $((OPTIND-1))
	    ;;
	h)
	    _usage
	    exit 0
	    ;;
	\?)
	    _usage
	    exit 1
    esac
done

if test $# -lt 2; then
    _usage
    exit 1
fi

if test ! -e $1; then
    echo "E: Can not find image file: "$1
    exit 1
fi
image=$1

if test ! -d $2; then
    echo "E: Please create mountpoint with 'mkdir -p $2'"
    exit 1
fi
mountpoint=$(cd $2 && pwd)

if test  `id -u` = 0; then
    su=""
else
    su="sudo "
fi

_mount

if test "x$shell" = "x1"; then
    /bin/bash
fi

exit 0