source: proiecte/PPPP/gdm/debian/gdm.preinst @ 134

#!/bin/sh -e

rm_conffile() {
  PKGNAME="gdm"
  CONFFILE="$1"

  if [ -e "$CONFFILE" ]; then
   md5sum="`md5sum \"$CONFFILE\" | sed -e \"s/ .*//\"`"
   old_md5sum="`dpkg-query -W -f='${Conffiles}' $PKGNAME | sed -n -e \"\\\\' $CONFFILE'{s/ obsolete$//;s/.* //p}\"`"
   if [ "$md5sum" != "$old_md5sum" ]; then
     echo "Obsolete conffile $CONFFILE has been modified by you."
     echo "Saving as $CONFFILE.dpkg-bak ..."
     mv -f "$CONFFILE" "$CONFFILE".dpkg-bak
   else
     echo "Removing obsolete conffile $CONFFILE ..."
     rm -f "$CONFFILE"
   fi
 fi
}

if [ "$1" = "upgrade" ] || [ "$1" = "install" ] && \
    # earlier releases used /etc/gdm/gdm.conf-custom, but upstream uses
    # custom.conf
    dpkg --compare-versions "$2" le-nl "2.26.1-0ubuntu5"; then
    if [ -f /etc/gdm/gdm.conf-custom ]; then
        echo "Renaming /etc/gdm/gdm.conf-custom to /etc/gdm/custom.conf" >&2
        mv /etc/gdm/gdm.conf-custom /etc/gdm/custom.conf
    fi

    # migrate autologin settings
    if ! egrep -q '^(Automatic|Timed)Login(Enable|Delay|)=' /etc/gdm/custom.conf; then
        settings="`egrep '^((Automatic|Timed)LoginEnable=[^f])|^((Automatic|Timed)Login=.)|^TimedLoginDelay=[^3]' /etc/gdm/gdm.conf`" || true
        if [ -n "$settings" ]; then
            echo '[daemon]' >> /etc/gdm/custom.conf
            echo "$settings" >> /etc/gdm/custom.conf
        fi
    fi

    # obsolete conffiles
    rm_conffile /etc/gdm/gdm.conf
    rm_conffile /etc/gdm/locale.conf
    rm_conffile /etc/gdm/gdmprefetchlist
    rm_conffile /etc/gdm/XKeepsCrashing
    rm_conffile /etc/gdm/modules/AccessKeyMouseEvents
    rm_conffile /etc/gdm/modules/factory-AccessKeyMouseEvents
    rm_conffile /etc/gdm/modules/AccessDwellMouseEvents
    rm_conffile /etc/gdm/modules/factory-AccessDwellMouseEvents
fi