#! /bin/sh

if [ $# -le 0 ]; then
  echo -n "Current scheme: "
  cat /etc/network/schemes/current
  exit 0
fi

newscheme=$1
echo "Changing scheme to $newscheme"

ifupdown() {
  iface=$1
  if grep -q "iface $iface" /etc/network/interfaces; then
    ifconfig $iface up
  else
    ifconfig $iface down
  fi
}

/etc/init.d/networking stop

echo $newscheme >/etc/network/schemes/current

if [ -f /etc/network/schemes/interfaces-$newscheme ]; then
  cp /etc/network/schemes/interfaces-$newscheme /etc/network/interfaces
  if [ -f /etc/network/schemes/resolv.conf-$newscheme ]; then
    cp /etc/network/schemes/resolv.conf-$newscheme /etc/resolv.conf
  fi
else
  echo -n "No scheme '$newscheme' -- create one for that essid?"
  read ans
  if [ x$ans = xn ]; then
    exit 0
  fi
  cat >/etc/network/interfaces <<EOF1
auto lo
iface lo inet loopback

auto eth1
allow-hotplug eth1
iface eth1 inet dhcp
EOF1
  echo "wireless-essid $newscheme" >>/etc/network/interfaces
fi

# On a laptop with built-in wifi and wired,
# ubuntu won't automatically disable one and enable the other.
# So do it manually (sigh):

ifupdown eth0
ifupdown eth1

/etc/init.d/networking start