#!/bin/sh
set -e

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

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

# Hack for bug #1181856: dpkg can't be trusted to correctly handle the
# conffile transition between netbase and ifupdown and changing from an
# upstart-job symlink to a real conffile, so we have to hack around it in
# the preinst and postinst.
# NOTE: This can be dropped after 14.04 LTS
if dpkg --compare-versions "$2" lt-nl 0.7.5ubuntu4; then
CONFFILE=/etc/init.d/networking
if ([ ! -e "$CONFFILE" ] && [ -e "$CONFFILE".dpkg-dist ]) \
|| [ $(readlink -f "$CONFFILE") = /lib/init/upstart-job ]
then
rm -f "$CONFFILE"
if [ -e "$CONFFILE".dpkg-new ]; then
mv "$CONFFILE".dpkg-new "$CONFFILE"
elif [ -e "$CONFFILE".dpkg-dist ]; then
mv "$CONFFILE".dpkg-dist "$CONFFILE"
fi
fi
fi

if [ "$1" = configure ]; then
addgroup --quiet --system netdev || true
fi

# Create /etc/network/run
if [ "$1" = configure -a ! -d /etc/network/run ]; then
if [ -e /etc/network/run -o -L /etc/network/run ]; then
echo "Removing non-directory /etc/network/run..."
rm -f /etc/network/run
fi

# The best choice is to use /run/network
# That must be supported everywhere

if [ ! -d /run/network ]; then
mkdir -p /run/network
chown root:netdev /run/network
fi
ln -s /run/network /etc/network/run
fi

[ -L /etc/network/run.dpkg-old ] && echo "Removing old symlink /etc/network/run.dpkg-old..." && rm -f /etc/network/run.dpkg-old

# Move /etc/network/ifstate to /etc/network/run/ifstate
if [ "$1" = configure -a "$2" != "" -a -e /etc/network/ifstate ] &&
dpkg --compare-versions "$2" lt "0.6.5"
then
if [ ! -e /etc/network/run/ifstate ] || ! diff /etc/network/ifstate /etc/network/run/ifstate >/dev/null
then
echo "Moving /etc/network/ifstate to /etc/network/run/ifstate"
if [ ! -L /etc/network/ifstate ]; then
mv /etc/network/ifstate /etc/network/run/ifstate
else
cat /etc/network/ifstate >/etc/network/run/ifstate
mv /etc/network/ifstate /etc/network/ifstate.dpkg-old
fi
fi
fi

l=$(readlink /etc/network/run || echo /etc/network/run)

# Migrate /etc/network/run to /run/network
if [ "$1" = configure -a "$2" != "" -a -e /etc/network/run -a "$l" != "/run/network" ]
then
echo "Migrating network state directory from $l to /run/network..."
[ -d /run/network ] || mkdir /run/network
if [ -e /etc/network/run/ifstate ]
then
echo "Moving /etc/network/run/ifstate to /run/network/ifstate"
if [ ! -L /etc/network/run/ifstate ]; then
mv -f /etc/network/run/ifstate /run/network/ifstate
else
# we do this thing with .dpkg-new just so we don't truncate the
# state file in the case of crazy symlinked or mount-bound setup
cat /etc/network/run/ifstate >/run/network/ifstate.dpkg-new
mv -f /etc/network/run/ifstate /run/network/ifstate.dpkg-old
mv -f /run/network/ifstate.dpkg-new /run/network/ifstate
fi
fi
mv -f /etc/network/run /etc/network/run.dpkg-old || true
ln -s /run/network /etc/network/run
[ -L /etc/network/run.dpkg-old ] && rm -f /etc/network/run.dpkg-old || true
[ -d /etc/network/run.dpkg-old ] && rmdir /etc/network/run.dpkg-old 2>/dev/null || report_warn "Not removing the old contents of /etc/network/run: directory not empty; renamed into /etc/network/run.dpkg-old."
fi


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
# 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.

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

# Generic stuff done on all configurations
if [ "$1" = "configure" ] ; then
# We don't need loopback interface definition anymore as
# ifupdown handles loopback interface on its own from now
if [ ! -f /etc/network/interfaces ] ; then
if [ -z "$2" ]; then
echo "Creating /etc/network/interfaces."
echo "# interfaces(5) file used by ifup(8) and ifdown(8)" > /etc/network/interfaces
echo "# Include files from /etc/network/interfaces.d:" >> /etc/network/interfaces
echo "source-directory /etc/network/interfaces.d" >> /etc/network/interfaces
else
report_warn "/etc/network/interfaces does not exist"
fi
fi
fi

if dpkg --compare-versions "$2" lt "0.7" ; then
update-rc.d -f ifupdown remove >/dev/null || true
update-rc.d -f ifupdown-clean remove >/dev/null || true
fi

# Automatically added by dh_installdeb
dpkg-maintscript-helper rm_conffile /etc/default/ifupdown 0.7~+ ifupdown -- "$@"
# End automatically added section
# Automatically added by dh_installdeb
dpkg-maintscript-helper rm_conffile /etc/init.d/ifupdown 0.7~+ ifupdown -- "$@"
# End automatically added section
# Automatically added by dh_installdeb
dpkg-maintscript-helper rm_conffile /etc/init.d/ifupdown-clean 0.7~beta1 ifupdown -- "$@"
# End automatically added section