#!/bin/sh -x
#
# USB drive hotplug agent for 2.6 kernels
#
#	ACTION=add
#	DEVPATH=/block/*
#

cd /etc/hotplug
. ./hotplug.functions

SourceIfNotEmpty /etc/sysconfig/hotplug

if [ "$HOTPLUG" == "no" -o "$USBPLUG" == "no" ];then
    exit 0
fi

STATEPATH=/var/lib/hotplug

UNIONTAB=/etc/uniontab
UNIONCTL=/usr/sbin/unionctl
MOUNT=/bin/mount
USBROOT=/media/storage_usbroot

[ -x $UNIONCTL -a -x $MOUNT ] || exit 1

function restart_services() {
    mesg "Restarting services with \"usbroot\" settings..."
    [ -s $USBROOT/etc/sysconfig/clock ] && /sbin/service clock start
    [ -d $USBROOT/etc/net ] && /sbin/service network restart
}

function add_unionfs_branches_to_usbroot() {
    mesg "Adding unionfs branches to $USBROOT"
    grep -ve '^\(#\|$\)' $UNIONTAB |while read mntpt; do
        if [ -d $mntpt ]; then
	    mkdir -p $USBROOT/$mntpt
	    mesg "Adding unionfs rw branch for $mntpt to $USBROOT/$mntpt ..."
	    $UNIONCTL $mntpt --add --mode rw $USBROOT/$mntpt && 	    mesg "Successfully added unionfs branch for $mntpt" || 	    mesg "Adding unionfs branch for $mntpt failed."
	fi
	[ $mntpt == /etc ] && restart_services
    done
}

function mount_usbroot() {
    /bin/mkdir $USBROOT
    mesg "Trying to mount /dev/$NAME to $USBROOT ..."
    $MOUNT /dev/$NAME $USBROOT -o sync && mesg "Successfully mounted." || exit 1
    mesg "Removing $USBROOT/etc/mtab"
    rm -f $USBROOT/etc/mtab
    if [ -s $UNIONTAB ]; then
	add_unionfs_branches_to_usbroot
    fi
}

case $ACTION in

add)
# FIXME: how to detect LABEL from udev (or HAL) ?
    NAME=`udevinfo -q name -p $DEVPATH`
# FIXME: remove trailing space from blkid output ?
    LABEL=`blkid /dev/$NAME -s LABEL | cut -d '=' -f2`
    [ $LABEL == \"usbroot\" ] || exit 0
    mesg "Found label $LABEL on $DEVPATH"
    mount_usbroot
    exit 0
    ;;
remove)
# FIXME: udevinfo not works without device
    NAME=`udevinfo -q name -p $DEVPATH`
    umount /dev/$NAME
    exit 0
    ;;
*)
    debug_mesg USB drive $ACTION event not supported
    exit 1
    ;;

esac