lkhh-mount

#! /bin/bash

_rootdir=${_rootdir:-"$(dirname "$(readlink -f "$0")")"}
_ver="0.0.1-dev"
#_author="Wei Peng <me@1pengw.com>"

source "${_rootdir}/_shared_prologue"

#
# parameters
#
declare -i nbd=${nbd:-1}
declare image=${image:-arch}
declare part=${part:-2}

#
# getopt processing
#
function my_getopt_cont () {
    local n_shift=1 # number of shifts in the outer loop; shift by 1 by default
    case "$1" in
        -n|--nbd)
            shift
            nbd=$1
            n_shift=2
            ;;
        -i|--image)
            shift
            image=$1
            n_shift=2
            ;;
        -p|--part)
            shift
            part=$1
            n_shift=2
            ;;
    esac
    return $n_shift
}

my_getopt "n:i:p:" "nbd:,image:,part:" "my_getopt_cont" "Mount OS root partition from image." "$(
cat <<END
[-n|--nbd=<nbd>] [-i|--image=<image>] [-p|--part=<partition>]
END
)" "$(
cat <<END
-n	--nbd		Network Block Device (NBD) for loop-mount the image (default: $nbd).
-i	--image		Image (.img) under $LKHH_IMAGE that hosts the OS (default: $image).
-p	--part		Root partition number inside the image (default: $part).
END
)" "$@"
ret=$?
eval set -- "$_getopt"
shift $ret 

# sanity check
vecho 0 <<END
$(
dumpparam <<END1
$(
for name in nbd image part; do
    echo "$name=$(echo $(eval "echo \$$name"))"
done
)
END1
)
END

image_path="$LKHH_IMAGE/$image.img"
[[ -f "$image_path" ]] || die 1 <<END
ERROR: $image_path is not an existing regular file.
END

nbd_device="/dev/nbd${nbd}"
[[ -b "$nbd_device" ]] || die 1 <<END
ERROR: $nbd_device is not a block special device.
END

mnt="$LKHH_IMAGE/mnt/$nbd"
mkdir -p "$mnt" 
[[ -d "$mnt" ]] || die 1 <<END
ERROR: $mnt is not an existing directory.
END

for exe in qemu-nbd partprobe sudo; do
    type -p $exe >/dev/null || die 1 <<END
ERROR: $exe is not on PATH.
END
done

vecho 0 <<END
sudo qemu-nbd -c "$nbd_device" "$image_path"
sudo partprobe "$nbd_device"
sudo mount "${nbd_device}p${part}" "$mnt"
END

sudo qemu-nbd -c "$nbd_device" "$image_path"
sudo partprobe "$nbd_device"
sudo mount "${nbd_device}p${part}" "$mnt"