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#!/bin/sh
set -e
# wdm versions before 1.28-4 updated display manager list in ${wdmconfig}
# conffile everytime wdm is installed, upgraded or run. That causes unneeded
# queries during upgrade. This was fixed in 1.28-4. This file tries to smooth
# upgrades from previous versions (1.28-2 and above). Checks if the only change
# is display manager line and then checks if change was not blessed by sysadmin,
# reverting automatic changes if so. See Debian bugs #582612 and #606788
# md5sums for pristine wdm-config with DisplayManager*wdmWm stripped
# wdm_1.28-2 (as well as lenny wdm_1.28-3)
pristine_stripped_md5="b903cf9c29cad13e3931ff30e6da7b96"
# Intermediate wdm_1.28-3.5
pristine_stripped_md5_alt="3ec0efa2089101552b0874ff63884292"
# pristine wdm-config DisplayManager*wdmWm string
pristine_string='! DisplayManager*wdmWm: twm:wmaker:afterstep'
wdmconfig="/etc/X11/wdm/wdm-config"
wdmconfig_tmp="${wdmconfig}.dpkg-tmp"
# Do nothing if this is first installation
if [ -f "$wdmconfig" ]; then
wdmconfig_stripped_md5=$(grep -v 'DisplayManager\*wdmWm:' "${wdmconfig}" | md5sum | sed 's/ .*//')
# First check if "$wdmconfig" matches old pristine files for everything but Displaymanager line.
if [ "$wdmconfig_stripped_md5" = "$pristine_stripped_md5" ] ||
[ "$wdmconfig_stripped_md5" = "$pristine_stripped_md5_alt" ]; then
wdmconfig_dpkg_md5sum=$(dpkg-query -W -f='${Conffiles}' wdm | grep "$wdmconfig" | awk '{print $2}')
sed -e 's/.*DisplayManager\*wdmWm:.*/'"$pristine_string"'/' "$wdmconfig" > "${wdmconfig_tmp}"
wdmconfig_new_md5=$(md5sum "${wdmconfig_tmp}" | sed 's/ .*//')
# Check now if re-created file md5 sum matches that registered by dpkg. Otherwise
# new file may have been explicitly accepted by sysadmin during upgrade.
if [ "$wdmconfig_new_md5" = "$wdmconfig_dpkg_md5sum" ]; then
echo "Reverting unblessed automatic changes to ${wdmconfig}." >&2
mv -f "${wdmconfig_tmp}" "$wdmconfig"
else
rm -f "${wdmconfig_tmp}"
fi
fi
fi
#DEBHELPER#
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