#!/bin/bash

# Builtin filesystems
BUILTIN_FS="iso9660 ext2 vfat"

mountit(){
# Usage: mountit src dst "options"
# Uses builtin mount of ash.grml
  for fs in $BUILTIN_FS; do
  test -b $1 && mount -t $fs $3 $1 $2 >/dev/null 2>&1 && return 0
  done
  return 1
}

DEVICES="$(< /proc/partitions tail +3 | awk '{print "/dev/"$4}' | tr "\n" " ")"
DEVICES="$DEVICES $(ls /dev/mapper/*)"
FOUND_DEBNET=""

for i in $DEVICES; do
  echo -n "Looking for Debian network configuration on $i... "
  if mountit $i /mnt "-o ro" >/dev/null 2>&1; then
    echo -n "mounted... "
    if [ -f /mnt/etc/network/interfaces ]; then
      echo "found."
      FOUND_DEBNET="$i"
      break
    else
      echo -n "not found. umounting... "
    fi
    umount /mnt
    echo "done."
  else
    echo "not mounted."
  fi
done

if [ -n "$FOUND_DEBNET" ]; then
  pump -k
  /etc/init.d/networking stop
  echo -n "Copying Debian network configuration from $FOUND_DEBNET... "
  rm -rf /etc/network/run
  cp -a /mnt/etc/network /etc
  rm -rf /etc/network/run
  mkdir /etc/network/run
  echo "done."

  echo -n "Umounting $FOUND_DEBNET... "
  umount /mnt
  echo "done."
  /etc/init.d/networking start
fi