#! /bin/bash
# common modules for pbuilder.
#   pbuilder -- personal Debian package builder
#   Copyright (C) 2001,2002 Junichi Uekawa
#
#   This program is free software; you can redistribute it and/or modify
#   it under the terms of the GNU General Public License as published by
#   the Free Software Foundation; either version 2 of the License, or
#   (at your option) any later version.
#
#   This program is distributed in the hope that it will be useful,
#   but WITHOUT ANY WARRANTY; without even the implied warranty of
#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#   GNU General Public License for more details.
#
#   You should have received a copy of the GNU General Public License
#   along with this program; if not, write to the Free Software
#   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
#

set -e 

function cleanup_function () {
    rm -f ${INSIDE_PBUILDER}
}

#default settings -- only for me.
MY_ETH0=tuntap,,,192.168.30.62
UML_IP=192.168.30.199
UML_NETMASK=255.255.255.0
UML_NETWORK=192.168.30.0
UML_BROADCAST=255.255.255.255
UML_GATEWAY=192.168.30.1
PBUILDER_UML_IMAGE="/tmp/uml"
UML_MOUNT_TMPFS="no"

function operate_uml () {
    # opeartes on UML, and runs pbuilder $1


    # use this script file to bootstrap the pbuilder inside the UML
    INSIDE_PBUILDER=$(tempfile)
    trap cleanup_function exit

    UML_CHROOT_MOUNTPOINT=/tmp/ubd1

    cat <<EOF > ${INSIDE_PBUILDER}
#! /bin/bash
mount -t proc /proc /proc
mount -t tmpfs /tmp /tmp
mkdir /tmp/ubd1
mount -t ext2 /dev/ubd/1 ${UML_CHROOT_MOUNTPOINT}
if [ "${UML_MOUNT_TMPFS}" = "yes" ]; then
  mount -t tmpfs ${UML_CHROOT_MOUNTPOINT}/tmp ${UML_CHROOT_MOUNTPOINT}/tmp
else
  # clean up tmp before playing with it.
  rm -rf ${UML_CHROOT_MOUNTPOINT}/tmp
  mkdir ${UML_CHROOT_MOUNTPOINT}/tmp
fi

cat <<IP > ${UML_CHROOT_MOUNTPOINT}/etc/network/interfaces
auto lo
iface lo inet loopback

# The first network card - this entry was created during the Debian installation
auto eth0
iface eth0 inet static
    address $UML_IP
    netmask $UML_NETMASK
    network $UML_NETWORK
    broadcast $UML_BROADCAST
    gateway $UML_GATEWAY

IP
cat <<SHELL > ${UML_CHROOT_MOUNTPOINT}/tmp/chrootshell
#! /bin/bash
# the shell executed inside chroot inside UML
    echo Starting network inside the chroot
    /etc/init.d/networking stop
    /etc/init.d/networking start
SHELL
chmod a+x /tmp/ubd1/tmp/chrootshell
chroot /tmp/ubd1/ /tmp/chrootshell

#some variables need to be set from outside values, possibly
export PATH=/sbin:/bin:/usr/sbin:/usr/bin
export LOGNAME="${LOGNAME}"
pbuilder "$1" --buildresult "" --buildplace /tmp/ubd1/ --internal-build-uml ${BUILDING_DSC_FILE} 
EOF

    chmod a+x ${INSIDE_PBUILDER}

    linux eth0=${MY_ETH0} con0=fd:0,fd:1 con=pty ubd0=/ ubd1=${PBUILDER_UML_IMAGE} devfs=mount init=${INSIDE_PBUILDER}
}


OPERATION="$1"
shift;


while [ -n "$1" ] ; do
    case "$1" in
	--eth0)
	    MY_ETH0="$2";
	    shift; shift;
	    ;;
	--uml-ip)
	    UML_IP="$2";
	    shift; shift;
	    ;;
	--uml-netmask)
	    UML_NETMASK="$2";
	    shift; shift;
	    ;;
	--uml-network)
	    UML_NETWORK="$2";
	    shift; shift;
	    ;;
	--uml-broadcast)
	    UML_BROADCAST="$2";
	    shift; shift;
	    ;;
	--uml-gateway)
	    UML_GATEWAY="$2";
	    shift; shift;
	    ;;
	--uml-image)
	    PBUILDER_UML_IMAGE="$2";
	    shift; shift;
	    ;;
	--mount-tmpfs)
	    UML_MOUNT_TMPFS="$2";
	    shift; shift;
	    ;;
	--)
	    shift;
	    break;
	    ;;
	--*)
	    echo "Error: Unknown option [$1] was specified " >&2 
	    exit 1;
	    ;;
	*)
	    break;
	    ;;
    esac
done

BUILDING_DSC_FILE=$(readlink -f "$1")


case "${OPERATION}" in
    build)
	operate_uml build 
	;;
    update)
	operate_uml update
	;;
    login)
	operate_uml login
	;;
    create)
	rootstrap -s 100 ${PBUILDER_UML_IMAGE}
	operate_uml update
	;;
    *)
	echo "Error: Unknown option [${OPERATION}] was specified " >&2 
	;;
esac