#!/bin/sh
# postinst script for debathena-cluster-login-config
#
# see: dh_installdeb(1)

set -e

# summary of how this script can be called:
#        * <postinst> `configure' <most-recently-configured-version>
#        * <old-postinst> `abort-upgrade' <new version>
#        * <conflictor's-postinst> `abort-remove' `in-favour' <package>
#          <new-version>
#        * <postinst> `abort-remove'
#        * <deconfigured's-postinst> `abort-deconfigure' `in-favour'
#          <failed-install-package> <version> `removing'
#          <conflicting-package> <version>
# for details, see http://www.debian.org/doc/debian-policy/ or
# the debian-policy package


#DEBHELPER#

package=debathena-cluster-login-config
ours=.debathena
theirs=.debathena-orig

undivert_unlink_symlink()
{
    file="$1"
    ourfile="$2"
    theirfile="$3"
    if [ ! -L "$file" ] || \
        [ "$(readlink "$file")" != "$(basename "$ourfile")" -a \
          "$(readlink "$file")" != "$(basename "$theirfile")" ]; then
        echo "*** OMINOUS WARNING ***: $file is not linked to either $(basename "$ourfile") or $(basename "$theirfile")" >&2
    else
        rm -f "$file"
    fi
}

undivert_unlink_divert()
{
    file="$1"
    if [ ! -L "$file" ] && [ ! -e "$file" ]; then
        dpkg-divert --remove --rename --package "$package" "$file"
    else
        echo "Not removing diversion of $file by $package" >&2
    fi
}

undivert_unlink()
{
    prefix=$1
    suffix=$2

    file=$prefix$suffix
    ourfile=$prefix$ours$suffix
    theirfile=$prefix$theirs$suffix

    undivert_unlink_symlink "$file" "$ourfile" "$theirfile"
    undivert_unlink_divert "$file" "$package"
}

cleanup_old_diversion() {
    file="$1"
    if dpkg-divert --list "${file}" | grep -Fxq "diversion of ${file} to ${file}${theirs} by ${package}"; then
        undivert_unlink "$file"
    fi
}

rm_conffile() {
    local PKGNAME="$1" # Unused
    local CONFFILE="$2"
    if [ -f "$CONFFILE".dpkg-del ]; then
        rm -f "$CONFFILE".dpkg-del
    fi
}

case "$1" in
    configure)
	gdm_version="$(dpkg-query -W -f '${Version}' gdm)"
	if dpkg --compare-versions "$gdm_version" ge '2.25.2~'; then
	    cleanup_old_diversion /etc/gdm/gdm.conf.debathena
	    cleanup_old_diversion /etc/gdm/gdm.conf-custom.debathena
	fi

        if dpkg --compare-versions "$2" lt 1.24~; then
            rm_conffile debathena-cluster-login-config "/etc/event.d/ttymsg"
            rm_conffile debathena-cluster-login-config "/etc/init/ttymsg.conf"
        fi

	if dpkg --compare-versions "$2" lt '1.36.2~'; then
	    # Cleanup from previous installs
	    # /etc/apt/preferences was frobbed due to (LP:508545)
	    if grep -qxF "Package: libstdc++5" /etc/apt/preferences 2>/dev/null; then
	        rm /etc/apt/preferences
	    fi
	    # Cleanup conffiles
	    rm_conffile debathena-cluster-login-config /etc/apt/sources.list.d/debathena-backports.list
	    rm_conffile debathena-cluster-login-config /etc/apt/preferences.d/debathena-libstdcplusplus.pref
	fi

	if dpkg --compare-versions "$2" lt 1.35.2~; then
	    update-grub
	fi

	# Shut down sshd and reload gdm.
	if hash invoke-rc.d; then
	    invoke-rc.d ssh stop
            invoke-rc.d gdm reload || true
	else
	    /etc/init.d/ssh stop
            /etc/init.d/gdm reload || true
	fi

        # Make sure the gettys are running
        initctl stop ttymsg >/dev/null 2>&1 || true
        for i in $(seq 1 6); do
            initctl stop "tty$i" >/dev/null 2>&1 || true
            initctl start "tty$i" >/dev/null 2>&1 || true
        done

	# Configure dns-nameservers if they're not there
	if ! egrep -q '^[[:space:]]+dns-nameservers' /etc/network/interfaces; then
	    echo '  dns-nameservers 18.70.0.160 18.71.0.151 18.72.0.3' >>/etc/network/interfaces
	    /usr/share/update-notifier/notify-reboot-required
	fi

	# Attempt to initially set the root password.
	/usr/sbin/athena-root-password

	# Files in sudoers.d must be chmod 0440 and not contain . or ~
	# Sadly, dh_installsudoers is not a thing.
	chmod 0440 /etc/sudoers.d/debathena-cluster-login-config-sudoers

	exit 0
    ;;

    abort-upgrade|abort-remove|abort-deconfigure)
    ;;

    *)
        echo "postinst called with unknown argument \`$1'" >&2
        exit 1
    ;;
esac