#! /bin/sh

set -e

# source debconf library
. /usr/share/debconf/confmodule

# debconf is not a registry, so we only fiddle with the default file if it
# does not exist
DEFAULT_DISPLAY_MANAGER_FILE=/etc/X11/default-display-manager
if [ ! -e "$DEFAULT_DISPLAY_MANAGER_FILE" ]; then
  DEFAULT_DISPLAY_MANAGER=
  if db_get shared/default-x-display-manager; then
    DEFAULT_DISPLAY_MANAGER="$RET"
  fi
  if [ -n "$DEFAULT_DISPLAY_MANAGER" ]; then
    DAEMON_NAME=
    if db_get "$DEFAULT_DISPLAY_MANAGER"/daemon_name; then
      DAEMON_NAME="$RET"
    fi
    if [ ! -n "$DAEMON_NAME" ]; then
      # if we were unable to determine the name of the selected daemon (for
      # instance, if the selected default display manager doesn't provide a
      # daemon_name question), guess
      DAEMON_NAME=$(which "$DEFAULT_DISPLAY_MANAGER" 2>/dev/null)
      if [ ! -n "$DAEMON_NAME" ]; then
        echo .
        # FIXME - redo this part uses shell-lib.sh from xfree86
        #warn "unable to determine path to default X display manager" \
        #     "$DEFAULT_DISPLAY_MANAGER; not updating" \
        #     "$DEFAULT_DISPLAY_MANAGER_FILE"
      fi
    fi
    if [ -n "$DAEMON_NAME" ]; then
      # FIXME - redo this part uses shell-lib.sh from xfree86
      #observe "committing change of default X display manager"
      echo "$DAEMON_NAME" > "$DEFAULT_DISPLAY_MANAGER_FILE"
    fi
  fi
fi

# remove the displaced old default display manager file if it exists
if [ -e "$DEFAULT_DISPLAY_MANAGER_FILE.dpkg-tmp" ]; then
  rm "$DEFAULT_DISPLAY_MANAGER_FILE.dpkg-tmp"
fi

# restarting the daemon may cause output to stdout
db_stop

# don't start kdm if we are upgrading without stopping it
NOSTART=
if [ -e /var/run/kdm-trinity.upgrade ]; then
  NOSTART=yes
fi
# or if we're currently in X on the display it attempts to manage by default
for HOST in "" \
            "localhost" \
            "$(hostname 2> /dev/null)" \
            "$(hostname -f 2> /dev/null)"; do
  if echo "$DISPLAY" | grep -q "^$HOST:0.*"; then
    NOSTART=yes
    break
  fi
done
# or if it's already running
if start-stop-daemon --stop --quiet --signal 0 --pid /var/run/kdm.pid --name kdm-trinity; then
  NOSTART=yes
fi
# or if the options file says not to
if ! grep -qs ^restart-on-upgrade /etc/trinity/kdm/kdm.options; then
  NOSTART=yes
fi


# md5sum of the stock Xservers shipped with KDE 3.3.2, which shipped with Sarge
SARGEXSERVERS=d3ab063f564492e0e31830f56ccd350e

CONFIGLEVEL=`grep -s ^ConfigVersion= /etc/trinity/kdm/kdmrc | sed s/^ConfigVersion=//`

if [ -e /etc/trinity/kdm/kdmrc ]; then
  if dpkg --compare-versions "$CONFIGLEVEL" ge "2.3"; then
    KDMRCUPDATED=yes
  fi
fi

if [ -e /etc/trinity/kdm/Xservers ]; then
  if [ `md5sum /etc/trinity/kdm/Xservers | sed s/\ .*$//` = $SARGEXSERVERS ]; then
    XSERVERSUNCHANGED=yes
  fi
fi

# With KDE 3.4, /etc/trinity/kdm/Xservers is no longer required, so we remove it, if
# the user has updated their kdmrc (if they haven't, kdm notices and keeps using
# Xservers), and if it wasn't touched, i.e. there are no local changes the user
# will want to merge into kdmrc.

case "$1" in

  configure)

    if [ ! -z $KDMRCUPDATED ] && [ ! -z $XSERVERSUNCHANGED ]; then
      echo "Removing obsolete /etc/trinity/kdm/Xservers (detected no user changes)."
      rm -f /etc/trinity/kdm/Xservers
    elif [ ! -z $KDMRCUPDATED ] && [ -e /etc/trinity/kdm/Xservers ]; then
      echo "Note that /etc/trinity/kdm/Xservers is no longer used by KDM."
      echo "You must merge your changes (if any) into /etc/trinity/kdm/kdmrc manually."
      echo "Otherwise, /etc/trinity/kdm/Xservers is safe to remove."
    fi

    
    

  ;;

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

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

esac

if [ -x "/etc/init.d/kdm-trinity" ]; then
  update-rc.d kdm-trinity defaults 13 01 >/dev/null
fi

if [ -n "$NOSTART" ]; then
  exit 0
else
  if [ -x "`which invoke-rc.d 2>/dev/null`" ]; then
    invoke-rc.d kdm-trinity start || true
  else
    /etc/init.d/kdm-trinity start || true
  fi
fi

exit 0
