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#!/bin/bash
# Author: Steven Shiau <steven _at_ clonezilla org>
# License: GPL
# Description: To get the display manager of server
# The following is borrowed from Mandrake 9.2
# we have to assume that /$SYSCONF_PATH/desktop has two variables, DESKTOP
# and DISPLAYMANAGER because administors may prefer a specific DM regardless
# of desktops.
# DISPLAYMANAGER is referenced by this script, and DESKTOP is referenced
# as system-wide default by /etc/X11/Xsession script only when X-session
# is opened by "startx" command.
# when DMs open an X-session, they send DESKTOP, which is in this case
# directly selected by users, as a commandline argument of /etc/X11/Xsession.
# actually Xsession script is only able to know by existance of its first
# argument whether it is called by DM or "startx". see the logic
# in /etc/X11/Xsession.
# If DISPLAYMANAGER is not defined, then assume that it is the same as DESKTOP
# Load DRBL setting and functions
DRBL_SCRIPT_PATH="${DRBL_SCRIPT_PATH:-/usr/share/drbl}"
. $DRBL_SCRIPT_PATH/sbin/drbl-conf-functions
#
usage() {
echo "Usage:"
echo "To get the default display manager:"
echo "`basename $0` [OPTION]"
echo " Options:"
echo " -h, --host IP_ADDRESS: get the default display manager of the host with IP_ADDRESS."
echo " -v, --verbose prints out verbose information"
}
# Parse command-line options
while [ $# -gt 0 ]; do
case "$1" in
-h|--host)
shift; specified_host="$1"
if [ -z "$specified_host" ]; then
usage >& 2
exit 2
fi
shift
;;
-v|--verbose)
shift; VERBOSE="on"
;;
-*) echo "${0}: ${1}: invalid option" >&2
usage >& 2
exit 2 ;;
*) break ;;
esac
done
#
if [ -z "$specified_host" ]; then
hpath=""
else
hpath="$drblroot/$specified_host"
fi
preferred=
if [ -e $hpath/etc/debian_version ]; then
# Debian
if [ -e $hpath/etc/X11/default-display-manager ]; then
# Debian
default_dm="$(cat $hpath/etc/X11/default-display-manager 2> /dev/null)"
[ -n "$default_dm" ] && preferred="$(basename $default_dm)"
fi
elif [ -e $hpath/etc/SuSE-release ]; then
# SuSE
if [ -e $hpath/$SYSCONF_PATH/displaymanager ]; then
# SuSE
. $hpath/$SYSCONF_PATH/displaymanager &>/dev/null
if [ "$DISPLAYMANAGER" = "GDM" -o "$DISPLAYMANAGER" = "gdm" -o "$DISPLAYMANAGER" = "GNOME" -o "$DISPLAYMANAGER" = "gnome" -o "$DISPLAYMANAGER" = "Gnome" ]; then
preferred=gdm
elif [ "$DISPLAYMANAGER" = "KDE" -o "$DISPLAYMANAGER" = "kde" ]; then
preferred=mdkkdm
elif [ "$DISPLAYMANAGER" = "KDM" -o "$DISPLAYMANAGER" = "kdm" ]; then
preferred=kdm
elif [ "$DISPLAYMANAGER" = "XDM" -o "$DISPLAYMANAGER" = "xdm" ] ; then
preferred=xdm
fi
fi
else
# RH-like
if [ -e $hpath/$SYSCONF_PATH/desktop ]; then
. $hpath/$SYSCONF_PATH/desktop &>/dev/null
[ -z "$DISPLAYMANAGER" ] && DISPLAYMANAGER=$DESKTOP
if [ "$DISPLAYMANAGER" = "GDM" -o "$DISPLAYMANAGER" = "gdm" -o "$DISPLAYMANAGER" = "GNOME" -o "$DISPLAYMANAGER" = "gnome" -o "$DISPLAYMANAGER" = "Gnome" ]; then
preferred=gdm
elif [ "$DISPLAYMANAGER" = "KDE" -o "$DISPLAYMANAGER" = "kde" ]; then
preferred=mdkkdm
elif [ "$DISPLAYMANAGER" = "KDM" -o "$DISPLAYMANAGER" = "kdm" ]; then
preferred=kdm
elif [ "$DISPLAYMANAGER" = "XDM" -o "$DISPLAYMANAGER" = "xdm" ] ; then
preferred=xdm
fi
fi
fi
# if the preferred dm is not found, set the default one
# For Redhat/FC, the default dm is gdm, for Mandrake, the default dm is kdm
if [ -z "$preferred" ]; then
# /etc/redhat-release & /etc/fedora-release should be the last one to test, since like MDV, it also has /etc/redhat-release.
if [ -e $hpath/etc/mandrakelinux-release -o \
-e $hpath/etc/mandrake-release -o \
-e $hpath/etc/mandriva-release ]; then
# For Mandrake, the default dm is kdm or mdkkdm, make sure it exists
if type kdm &>/dev/null; then
preferred="kdm"
elif type mdkkdm &>/dev/null; then
preferred="mdkkdm"
fi
elif [ -e $hpath/etc/debian_version ]; then
# For Debian, the default gdm, then kdm or xdm
if type gdm &>/dev/null; then
preferred="gdm"
elif type kdm &>/dev/null; then
preferred="kdm"
elif type xdm &>/dev/null; then
preferred="xdm"
fi
elif [ -e $hpath/etc/SuSE-release ]; then
# For SuSE, the default kdm, then gdm or xdm
if type kdm &>/dev/null; then
preferred="kdm"
elif type gdm &>/dev/null; then
preferred="gdm"
elif type xdm &>/dev/null; then
preferred="xdm"
fi
elif [ -e $hpath/etc/redhat-release -o -e $hpath/etc/fedora-release ]; then
# /etc/redhat-release & /etc/fedora-release should be the last one to test, since like MDV, it also has /etc/redhat-release.
# For Redhat/FC, the default dm is gdm, make sure it exists
type gdm &>/dev/null && preferred="gdm"
else
# echo "Unsupported distribution! Can NOT decide which dm is used in your system...Program terminated!"
exit 1
fi
fi
# output the results.
if [ -n "$preferred" ]; then
echo $preferred
exit 0
else
# echo "The gdm, kdm or xdm is NOT found in your system!"
exit 1
fi
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