#!/bin/bash

DEV=/dev/sdb
MNT=/media/esata-
DELAY=3

registered() {
    if [ -b "$DEV" ]; then
	return 0
    else
	return 1
    fi
}

mounted() {
    if mount | grep -q "$MNT"; then
	return 0
    else
	return 1
    fi
}

doregister() {
    registered && return 0
    scsiadd -a 1 0 0 0 >/dev/null || return 1
    sleep $DELAY
    registered && return 0 || return 0
}

domount() {
    mounted && return 0
    doregister || return 1
    mkdir -p "${MNT}1" || return 1
    mount ${DEV}1 ${MNT}1 || return 1
    mkdir -p "${MNT}2" || return 1
    mount ${DEV}2 ${MNT}2 || return 1
    return 0
}

dounregister() {
    registered || return 0
    scsiadd -r 1 0 0 0 >/dev/null || return 1
    sleep $DELAY
    registered && return 1 || return 0
}

doumount() {
    mounted || return 0
    umount ${MNT}2 || return 1
    umount ${MNT}1 || return 1
    mounted && return 1
    dounregister || return 1
    return 0
}

if [ "$1" = "mount" ]; then
    if domount; then
	echo "esata is mounted"
    else
	echo "$0: cannot mount esata" >&2
	dounregister
    fi
elif [ "$1" = "umount" -o "$1" = "unmount" ]; then
    if doumount; then
	echo "esata is unmounted"
    else
	echo "$0: cannot unmount esata" >&2
	exit 1
    fi
elif [ "$1" = "register" ]; then
    if doregister; then
	echo "esata is registered"
    else
	echo "$0: cannot register esata" >&2
	exit 1
    fi
elif [ "$1" = "status" ]; then
    if mounted; then
	echo "esata is mounted"
    elif registered; then
	echo "esata is registered but not mounted"
    else
	echo "esata is unregistered"
    fi
    #mount | grep "$DEV"
    #scsiadd -p | grep "scsi1"
else
    echo "usage: $0 [mount|umount|register|status]"
fi
exit 0