#!/bin/sh
set -e

. /usr/share/debconf/confmodule

MYNAME="${0##*/}"

report() { echo "${MYNAME}: $*" ; }
report_warn() { report "Warning: $*" >&2 ; }
report_err() { report "Error: $*" >&2 ; }

ATTEMPT_CONVERSION=false
if [ "$1" = "configure" ] && [ "$2" != "" ] &&
        dpkg --compare-versions "$2" le "0.6.2pr-3"
then
  # Get answers to questions
  db_get ifupdown/convert-interfaces;    ATTEMPT_CONVERSION="$RET"
fi

# Update /etc/network/interfaces from "noauto" to "auto"
if [ "$ATTEMPT_CONVERSION" = "true" ]; then
  echo
  echo -n "Automatically converting /etc/network/interfaces"
  (
    cd /etc/network;
    if /usr/share/ifupdown/upgrade-from-0.5.x.pl \
      < interfaces > interfaces.dpkg-new 2>/dev/null
    then
      echo " succeeded."
      mv interfaces interfaces.dpkg-old
      mv interfaces.dpkg-new interfaces
      echo "Old interfaces file saved as interfaces.dpkg-old."
    else
      echo " failed."
      echo
      echo "If you wish to reattempt the conversion you may run"
      echo "    cat /etc/network/interfaces |"
      echo "         /usr/share/ifupdown/upgrade-from-0.5.x.pl"
      echo
    fi
  )
fi


ATTEMPT_CONVERSION=false
if [ "$1" = "configure" ] && [ "$2" != "" ] &&
	dpkg --compare-versions "$2" lt "0.6.7ubuntu7"
then
  # Get answers to questions
  db_get ifupdown/convert-interfaces-hotplug;    ATTEMPT_CONVERSION="$RET"
fi

# Update /etc/network/interfaces from "mapping hotplug" to "auto"
if [ "$ATTEMPT_CONVERSION" = "true" ]; then
  echo
  echo -n "Automatically converting /etc/network/interfaces"
  (
    cd /etc/network;
    if /usr/share/ifupdown/upgrade-from-hotplug.pl \
      < interfaces > interfaces.dpkg-new 2>/dev/null
    then
      echo " succeeded."
      mv interfaces interfaces.dpkg-old
      mv interfaces.dpkg-new interfaces
      echo "Old interfaces file saved as interfaces.dpkg-old."
    else
      echo " failed."
      echo
      echo "If you wish to reattempt the conversion you may run"
      echo "    cat /etc/network/interfaces |"
      echo "         /usr/share/ifupdown/upgrade-from-hotplug.pl"
      echo
    fi
  )
fi


# For every active ifupdown-controlled dhclient interface, copy
# /var/run/dhclient.pid, so that the new ifdown is able to kill
# dhclient.
#
# the old version had a bug with more than one DHCP iface anyway,
# so we don't know which one the PID file actually belongs to.
if [ "$1" = "configure" -a "$2" != "" ] &&
     dpkg --compare-versions "$2" le "0.6.4-4.1" &&
     [ -f /etc/network/run/ifstate -a -x /sbin/dhclient ]
then

  sed -e 's/^.*=//' /etc/network/run/ifstate |
    while read iface; do
      # handle \<newline>-continued lines
      if sed -e '/^[[:space:]]*#/b;:g /\\$/{N;s/\\\n//;bg;}' /etc/network/interfaces | grep -qe "^[[:space:]]*iface[[:space:]]*\\b${iface}\\b[[:space:]]*.*\\bdhcp\\b.*" &&
          [ -f "/var/run/dhclient.pid" ] &&
          [ ! -f "/var/run/dhclient.${iface}.pid" ]
      then
        # copy original file.  If dhclient was started
        # manually, one can still use dhclient.pid, if started
        # by ifupdown, the new ifupdown can take it down with 
        # dhclient.${iface}.pid.  Obsolete files are removed during
        # next boot (bootmisc.sh).
        cp /var/run/dhclient.pid "/var/run/dhclient.${iface}.pid"
      fi
    done
fi

# Move /etc/network/ifstate or /etc/network/run/ifstate to
# /var/run/network/ifstate if that has been turned into a tmpfs already
if [ "$1" = configure -a "$2" != "" ] &&
     dpkg --compare-versions "$2" lt "0.6.7ubuntu4"
then
    if mountpoint -q /var/run; then
	[ -d /var/run/network ] || mkdir /var/run/network
	[ ! -e /etc/network/ifstate ] || mv -f /etc/network/ifstate /var/run/network/ifstate
	[ ! -e /etc/network/run/ifstate ] || mv -f /etc/network/run/ifstate /var/run/network/ifstate
    else
	# Yes, this will break things, but only until reboot <g>
	rm -f /etc/network/ifstate /etc/network/run/ifstate
	if [ -x /usr/share/update-notifier/notify-reboot-required ]; then
	    /usr/share/update-notifier/notify-reboot-required
	fi
    fi
    [ ! -d /etc/network/run ] || rmdir /etc/network/run 2>/dev/null || true
fi

# Remove the ifupdown and ifupdown-clean init script symlinks
if [ "$1" = "configure" -a "$2" != "" ] &&
     dpkg --compare-versions "$2" lt "0.6.7ubuntu4"
then
    rm -f /etc/init.d/ifupdown /etc/init.d/ifupdown-clean
    rm -f /etc/default/ifupdown
	
    update-rc.d -f ifupdown remove
    update-rc.d -f ifupdown-clean remove
fi

# Remove the loopback init script symlinks
if [ "$1" = "configure" -a "$2" != "" ] &&
     dpkg --compare-versions "$2" lt "0.6.8ubuntu19"
then
    update-rc.d -f loopback remove
fi

# Generic stuff done on all configurations
if [ "$1" = "configure" ] ; then
  if [ -f /etc/network/interfaces ] ; then
    # TODO: This should be handled with debconf and the script
    # could introduce the line there directly
    if ! grep -q "^[[:space:]]*iface[[:space:]]\+lo[[:space:]]\+inet[[:space:]]\+loopback\>" /etc/network/interfaces ; then
      report_warn "No 'iface lo' definition found in /etc/network/interfaces"
      report_warn " adding it for you"
      if ! grep -q "^[[:space:]]*auto[[:space:]].*\<lo\>" /etc/network/interfaces ; then
        # both are missing? add the whole block
        report_warn "No 'auto lo' statement found in /etc/network/interfaces"
        report_warn " adding it for you"
cat >> /etc/network/interfaces <<EOF

# The loopback network interface
auto lo
iface lo inet loopback
EOF
      else
        sed -i -e'/^[[:space:]]*auto[[:space:]].*\<lo\>/a\
iface lo inet loopback' /etc/network/interfaces
      fi
    fi
    if ! grep -q "^[[:space:]]*auto[[:space:]].*\<lo\>" /etc/network/interfaces ; then
      report_warn "No 'auto lo' statement found in /etc/network/interfaces"
      report_warn " adding it for you"
      sed -i -e'/^[[:space:]]*iface[[:space:]]\+lo[[:space:]]\+inet[[:space:]]\+loopback\>/i\
auto lo' /etc/network/interfaces
    fi
  else  # ! -f /etc/network/interfaces
    echo "Creating /etc/network/interfaces."
    echo "# interfaces(5) file used by ifup(8) and ifdown(8)" > /etc/network/interfaces
    echo "auto lo" >> /etc/network/interfaces
    echo "iface lo inet loopback" >> /etc/network/interfaces
  fi
fi

db_stop

# Automatically added by dh_installinit
if [ -e "/etc/init/network-interface-security.conf" ]; then
	# start fails if already running
	start network-interface-security || :
fi
# End automatically added section