#!/bin/sh
#
# This file is part of the resolvconf package.
#

set -e

. /usr/share/debconf/confmodule

MYNAME=resolvconf.postinst
report() { echo "${MYNAME}: $*" ; }
report_err() { report "Error: $*" >&2 ; }
report_warn() { report "Warning: $*" >&2 ; }
report_info() { report "$*" >&2 ; }

OLD_RUN_DIR=/var/run

is_immutable_file() {
[ "$1" ] || return 2
[ -e "$1" ] || return 1
[ ! -L "$1" ] || return 1
local ATTR="$(lsattr "$1" 2>/dev/null || :)"
[ "$ATTR" ] || return 1
echo "$ATTR" | awk '$1 ~ /i/ { exit 0; }; { exit 1; }'
}

### Deal with obsolete configuration files ###
rm -f /etc/dhcp3/dhclient-enter-hooks.d/resolvconf
[ -f /etc/resolvconf/update.d/bind ] && mv -f /etc/resolvconf/update.d/bind /etc/resolvconf/update.d/bind.dpkg-old

### Create run-time directories and linkify ###
#
# We create the run-time directories here, in the postinst, even though
# we also do so in the preinst, because
# * the system may have rebooted since the preinst ran, causing
# everything on tmpfses to disappear;
# * multistrap doesn't run the preinst at all.
#
case "$1" in
configure)
# Linkify /etc/resolv.conf if appropriate
db_get resolvconf/linkify-resolvconf
if [ "$RET" = "true" ] ; then
if is_immutable_file /etc/resolv.conf ; then
db_input critical resolvconf/fixing-immutable
db_go || :
chattr -i /etc/resolv.conf
fi

if [ -f /etc/resolv.conf ] \
&& [ ! -L /etc/resolv.conf ]
then
# Back up original file
if [ ! -e /etc/resolvconf/resolv.conf.d/original ] ; then
cp -a /etc/resolv.conf /etc/resolvconf/resolv.conf.d/original
db_get resolvconf/link-tail-to-original
if [ "$RET" = "true" ]; then
ln -s original /etc/resolvconf/resolv.conf.d/tail
else
: > /etc/resolvconf/resolv.conf.d/tail
fi
else
cp -a /etc/resolv.conf /etc/resolv.conf.dpkg-old
fi

mkdir -p /run/resolvconf/interface

# Before creating the link, make sure that the original file is
# at the target of the link. /sbin/resolvconf will overwrite
# this when it does an update, of course.
if [ ! -e /run/resolvconf/resolv.conf ] ; then
cp -a /etc/resolv.conf /run/resolvconf/resolv.conf
fi

# Add the original file to the database so that its contents
# are included when resolvconf updates.
# Yes, this is an ugly workaround for the problem that there
# is no way to obtain nameserver information from interface
# configurers after they have done their configuration work.
cp -a /etc/resolv.conf /run/resolvconf/interface/original.resolvconf
fi

# Create the link and make sure we don't convert it again on upgrade
# The link is relative to allow for cp from outside a chroot into a chroot
# to work without overwriting the file outside the chroot (or failing)
ln -nsf ../run/resolvconf/resolv.conf /etc/resolv.conf
db_set resolvconf/linkify-resolvconf false
fi

# FHS violation; get rid of it, we use /run directly now.
if [ -e /etc/resolvconf/run ]; then
rm -rf /etc/resolvconf/run
fi
;;
# triggered)
# Don't do anything here
# ;;
# abort-upgrade)
# Don't do anything here since we don't do anything in the prerm on upgrade or on failed-upgrade
# ;;
# abort-remove)
# Don't do anything extra here since we don't deconfigure anything in the prerm on remove
# ;;
# abort-deconfigure)
# Don't do anything extra here since we don't do anything in the prerm on deconfigure
# ;;
esac

db_stop

### Notify others of our installation ###

is_installed() {
# Same function in preinst, postinst, postrm
[ "$1" ] || return 1
dpkg-query -W -f='${Status}\n' "$1" 2>/dev/null | grep -siq '^[[:alpha:]]\+ [[:alpha:]]\+ installed$' >/dev/null 2>&1
}

case "$1" in
configure)
if [ -f /run/resolvconf/packages-to-notify ] ; then
PACKAGES_TO_NOTIFY="$(cat /run/resolvconf/packages-to-notify)"
rm -f /run/resolvconf/packages-to-notify
for PKG in $PACKAGES_TO_NOTIFY ; do
if is_installed "$PKG" ; then
SCRPT="/usr/lib/resolvconf/dpkg-event.d/$PKG"
if [ -x "$SCRPT" ] ; then
"$SCRPT" install || :
fi
fi
done
fi
;;
# triggered)
# Don't do anything
# ;;
# abort-upgrade)
# Don't do anything here since we don't do anything in the prerm on upgrade or on failed-upgrade
# ;;
# abort-remove)
# Don't do anything extra here since we don't deconfigure anything in the prerm on remove
# ;;
# abort-deconfigure)
# Don't do anything extra here since we don't do anything in the prerm on deconfigure
# ;;
esac

# Automatically added by dh_installinit
if [ -x "/etc/init.d/resolvconf" ]; then
if [ ! -e "/etc/init/resolvconf.conf" ]; then
update-rc.d resolvconf defaults >/dev/null
fi
invoke-rc.d resolvconf start || exit $?
fi
# End automatically added section
# Automatically added by dh_installinit
update-rc.d -f resolvconf remove >/dev/null || exit $?
# End automatically added section


exit 0