#!/bin/sh

PREREQ=""

prereqs()
{
       echo "$PREREQ"
}

case $1 in
# get pre-requisites
prereqs)
       prereqs
       exit 0
       ;;
esac

. /scripts/casper-functions
. /scripts/casper-helpers

mountpoint=/cdrom

is_updates_path() {
	# Driver packages are stored in ubuntu-drivers/<kver>/
	# subdirectory. Each package contains a module for a specific
	# kernel flavour.
	path=$1
	abi="$(uname -r)"
	kver="$(echo "$abi" | cut -d- -f1,2)"
	kbase="$(echo "$abi" | cut -d- -f1)"
	for leaf in "$abi" "$kver" "$kbase"; do
		update_dir="$path/ubuntu-drivers/$leaf"
		[ -d "$update_dir" ] || continue
		if [ "$(echo $update_dir/*_$DPKG_ARCH.deb)" != \
			"$update_dir/*_$DPKG_ARCH.deb" ]; then
			echo "$update_dir"
			return 0
		fi
	done
	return 1
}

is_nice_device() {
    sysfs_path="${1#/sys}"
    if /sbin/udevadm test-builtin path_id "${sysfs_path}" | egrep -q "ID_PATH=(usb|pci-[^-]*-(ide|scsi|usb))"; then
        return 0
    fi
    return 1
}

check_dev_updates ()
{
    sysdev="${1}"
    devname="${2}"
    if [ -z "${devname}" ]; then
        devname=$(sys2dev "${sysdev}")
    fi

    fstype=$(get_fstype "${devname}")
    if is_supported_fs ${fstype}; then
        mount -t ${fstype} -o ro "${devname}" $mountpoint || continue
        if is_updates_path $mountpoint; then
            return 0
        else
            umount $mountpoint
        fi
    fi

    return 1
}

find_driver_updates() {
    for sysblock in $(echo /sys/block/* | tr ' ' '\n' | grep -v loop | grep -v ram); do
        devname=$(sys2dev "${sysblock}")
        fstype=$(get_fstype "${devname}")
        if /lib/udev/cdrom_id ${devname} > /dev/null; then
            if check_dev_updates "null" "${devname}" ; then
                return 0
            fi
        elif is_nice_device "${sysblock}" ; then
            for dev in $(subdevices "${sysblock}"); do
                if check_dev_updates "${dev}" ; then
                    return 0
                fi
            done
        fi
    done
    return 1
}


updates="false"

for x in $(cat /proc/cmdline); do
	case $x in
		debian-installer/driver-update=*)
			updates=${x#debian-installer/driver-update=}
			;;
	esac
done

if [ "$updates" != "true" ]; then
	log_end_msg
	exit 0
fi

# Not sure what to do for network installs. I assume there isn't even a CD
# for this anyway, so fail.
if [ -n "${NETBOOT}" ]; then
	log_end_msg
	exit 0;
fi

#if chroot /root [ -f /etc/gdm/gdm-cdd.conf ]; then
#    GDMCONF=/etc/gdm/gdm-cdd.conf
#else
#    GDMCONF=/etc/gdm/gdm.conf
#fi

eject
log_wait_msg "Insert a driver CD and press ENTER ($DPKG_ARCH)"

log_begin_msg "Looking for driver update CD"

for i in 0 1 2 3 4 5 6 7 8 9 a b c d e f 10 11 12 13; do
	updates_root=$(find_driver_updates)
	if [ "${updates_root}" ]; then
		break;
	fi
	sleep 1
done

log_end_msg

if [ -z "${updates_root}" ]; then
	log_begin_msg "Could not find driver updates"
	log_wait_msg "Re-insert install CD and press ENTER"
	exit 0
fi

log_begin_msg "Copying driver updates to temporary location"

mkdir -p /tmp/driver-updates
cp $updates_root/*_$DPKG_ARCH.deb /tmp/driver-updates/
umount $mountpoint
eject

log_end_msg

log_wait_msg "Re-insert install CD and press ENTER."