# vim: set ft=sh:

find_dev_by_path () {
    local path="${1}"
    local tmp_mnt=/tmp_mnt
    local _mnt
    local a d
    local device

    [[ "$path" ]] || return 1

    mkdir -p "${tmp_mnt}"

    for a in 1 2 3; do
        for d in $(awk '{ print "/dev/"$4 }' /proc/partitions); do

            # If the device is already mounted, it shouldn't be
            # unmounted after the check.

            grep -q "^$d " /proc/mounts && {
                _mnt=$(grep "^$d " /proc/mounts | cut -d ' ' -f 2)
                unmount=
            } || {
                mount -r -t auto "${d}" "${tmp_mnt}" 2> /dev/null || continue
                _mnt="${tmp_mnt}"
                unmount=true
            }

            # File exists in $d. Save $d on $device.

            [[ -f "${_mnt}/${path}" ]] && device="${d}"
            [[ "${unmount}" ]] && umount "${tmp_mnt}" 2> /dev/null || true
            [[ "${device}" ]] && {
                echo "${device}"
                return
            }

        done
        sleep 1
    done
    return 1
}

run_hook () {
    [[ -z "${img_flags}" ]] && img_flags="defaults"
    if [[ "${img_loop}" ]]; then
        img_dev=$(find_dev_by_path "${img_loop}")
        mount_handler="miso_loop_mount_handler"
    fi
}

miso_loop_mount_handler () {
    newroot="${1}"

    local _dev_loop

    msg ":: Setup a loop device from ${img_loop} located at device ${img_dev}"
    _mnt_dev "${img_dev}" "/run/miso/img_dev" "-r" "${img_flags}"
    if [[ "${copytoram}" != "y" ]]; then
        echo $(readlink -f ${img_dev}) >> /run/miso/used_block_devices
    fi

    if _dev_loop=$(losetup --find --show --read-only "/run/miso/img_dev/${img_loop}"); then
        misodevice="${_dev_loop}"
    else
        echo "ERROR: Setting loopback device for file '/run/miso/img_dev/${img_loop}'"
        launch_interactive_shell
    fi

    miso_mount_handler ${newroot}

    if [[ "${copytoram}" == "y" ]]; then
        losetup -d ${_dev_loop} 2>/dev/null
        umount /run/miso/img_dev
    else
        echo $(readlink -f ${img_dev}) >> /run/miso/used_block_devices
    fi
}