LinuxQuestions.org - My xorg.conf is replaced with a default xorg.conf after reboot

Thank you smoker. I prefer to do it the right way.

Below is the dexconf script.
Code:
#!/bin/sh



# dexconf: Debian X server configuration file writer

#

# This tool is a backend which uses debconf database values.  It writes an

# XFree86 X server configuration file based on the information in the database.

#

# Author: Branden Robinson



# Copyright 2000--2004 Progeny Linux Systems, Inc.

#

# This is free software; you may redistribute it and/or modify

# it under the terms of the GNU General Public License as

# published by the Free Software Foundation; either version 2,

# or (at your option) any later version.

#

# This is distributed in the hope that it will be useful, but

# WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

# GNU General Public License for more details.

#

# You should have received a copy of the GNU General Public License with

# the Debian operating system, in /usr/share/common-licenses/GPL;  if

# not, write to the Free Software Foundation, Inc., 59 Temple Place,

# Suite 330, Boston, MA 02111-1307 USA



set -e



# source debconf library

. /usr/share/debconf/confmodule



# display a usage message

usage () {

  cat <<EOF

Usage: $PROGNAME [OPTION ...]

  write an Xorg X server configuration file based on debconf database values

Options:

  -h, --help                                display this usage message and exit

  -o FILE, --output=FILE                        write configuration file to FILE

This help message is intended only as a quick reference.  For a description of

the usage of $PROGNAME, see the $PROGNAME(1) manual page.

EOF

}



# the error-out function

bomb () {

  echo "$PROGNAME: error: $*" | fold -s -w "${COLUMNS:-80}" >&2

  exit 1

}



# wrapper around db_get to ensure that the info we try to retrieve exists; it

# is (almost) always a fatal error for the values to be null

fetch () {

  db_get "$1" || true

  if [ -z "$RET" ]; then

    ERRMSG="cannot generate configuration file; $1 not set.  Aborting."

    ERRMSG="$ERRMSG  Reconfigure the X server with \"dpkg-reconfigure"

    ERRMSG="$ERRMSG xserver-xorg\" to correct this problem."

    bomb "$ERRMSG"

  fi

}



# convert a debconf comma-delimited list to a shell whitespace-delimited list

list_convert () {

  echo $(IFS=", "; set -- $RET; while [ $# -gt 0 ]; do echo \"$1\"; shift; done)

}



SERVER="xorg"

XF86CONFIG=/etc/X11/xorg.conf

PROGNAME=${0##*/}

SHOWHELP=

EARLYEXIT=



GETOPT_OUTPUT=$(getopt --options ho: \

                      --longoptions help,output: \

                      -n "$PROGNAME" -- "$@")



if [ $? -ne 0 ]; then

    bomb "error while getting options; use \"$PROGNAME --help\" for help"

fi



eval set -- "$GETOPT_OUTPUT"



while :; do

    case "$1" in

        -f|--format)

          bomb "This option, and XFree86 3.x output, are no longer supported."

          ;;

        -h|--help) SHOWHELP=yes EARLYEXIT=yes ;;

        -o|--output) XF86CONFIG="$2"; shift ;;

        --) shift; break ;;

        *)

          bomb "unrecognized option \"$1\"; use \"$PROGNAME --help\" for help"

          ;;

    esac

    shift

done



if [ -n "$SHOWHELP" ]; then

    usage

fi



if [ -n "$EARLYEXIT" ]; then

    exit 0

fi



if which laptop-detect >/dev/null 2>&1; then

  if laptop-detect > /dev/null ; then

    LAPTOP=true

  fi

fi



DEXCONFTMPDIR=



trap 'if [ -e "$DEXCONFTMPDIR/backup" ] && [ -n "$XF86CONFIG" ]; then \

        cat "$DEXCONFTMPDIR/backup" >"$XF86CONFIG"; \

      fi; \

      exec 4<&-; \

      rm -rf "$DEXCONFTMPDIR"; \

      bomb "received signal; aborting"' HUP INT QUIT TERM





# Set up a temporary directory for the files we'll be writing.

TDIR_PARENT="${TMPDIR:-/tmp}"

TDIR="${TMPDIR:-/tmp}/dexconf-tmp-$$"



if [ ! -d "$TDIR_PARENT" ]; then

  bomb "cannot create temporary work directory; \"$TDIR_PARENT\" does not" \

    "exist or is not a directory"

fi



if [ ! -w "$TDIR_PARENT" ]; then

  bomb "cannot create temporary work directory in \"$TDIR_PARENT\"; directory" \

    "not writable"

fi



rm -rf "$TDIR"



if mkdir -m 0700 "$TDIR"; then

  DEXCONFTMPDIR="$TDIR"

else

  bomb "creation of temporary work directory \"$TDIR\" failed"

fi



# xorg.conf sections:

#  Files          File pathnames

#  ServerFlags    Server flags                      NOT USED BY DEXCONF

#  Module        Dynamic module loading            NOT USED BY DEXCONF

#  InputDevice    Input device description

#  Device        Graphics device description

#  VideoAdaptor  Xv video adaptor description      NOT USED BY DEXCONF

#  Monitor        Monitor description

#  Modes          Video modes descriptions          NOT USED BY DEXCONF

#  Screen        Screen configuration

#  ServerLayout  Overall layout                    NOT USED BY DEXCONF

#  DRI            DRI-specific configuration        NOT USED BY DEXCONF

#  Vendor        Vendor-specific configuration    NOT USED BY DEXCONF



### HEADER



# Because debconf hijacks standard output and its confmodule uses file

# descriptor 3 for its own purposes, we will write our output to file descriptor

# 4 instead of standard output.



exec 4>"$DEXCONFTMPDIR/Header"

cat >&4 <<SECTION

# xorg.conf (X.Org X Window System server configuration file)

#

# This file was generated by dexconf, the Debian X Configuration tool, using

# values from the debconf database.

#

# Edit this file with caution, and see the xorg.conf manual page.

# (Type "man xorg.conf" at the shell prompt.)

#

# This file is automatically updated on xserver-xorg package upgrades *only*

# if it has not been modified since the last upgrade of the xserver-xorg

# package.

#

# If you have edited this file but would like it to be automatically updated

# again, run the following command:

#  sudo dpkg-reconfigure -phigh xserver-xorg

SECTION



### KEYBOARD / INPUTDEVICE



fetch xserver-$SERVER/config/inputdevice/keyboard/rules

XKB_RULES="$RET"

fetch xserver-$SERVER/config/inputdevice/keyboard/model

XKB_MODEL="$RET"

fetch xserver-$SERVER/config/inputdevice/keyboard/layout

XKB_LAYOUT="$RET"

# XkbVariant and XkbOptions are permitted to be null.

db_get xserver-$SERVER/config/inputdevice/keyboard/variant

XKB_VARIANT="$RET"

db_get xserver-$SERVER/config/inputdevice/keyboard/options

XKB_OPTIONS="$RET"



exec 4>"$DEXCONFTMPDIR/InputDeviceKeyboard"

cat >&4 <<SECTION

Section "InputDevice"

        Identifier        "Generic Keyboard"

        Driver                "kbd"

        Option                "XkbRules"        "$XKB_RULES"

        Option                "XkbModel"        "$XKB_MODEL"

        Option                "XkbLayout"        "$XKB_LAYOUT"

SECTION

if [ -n "$XKB_VARIANT" ]; then

  printf "\tOption\t\t\"XkbVariant\"\t\"$XKB_VARIANT\"\n" >&4

fi

if [ -n "$XKB_OPTIONS" ]; then

  printf "\tOption\t\t\"XkbOptions\"\t\"$XKB_OPTIONS\"\n" >&4

fi

printf "EndSection\n" >&4



### MOUSE / INPUTDEVICE



DO_EMULATE3BUTTONS=



fetch xserver-$SERVER/config/inputdevice/mouse/emulate3buttons

if [ "$RET" = "true" ]; then

  DO_EMULATE3BUTTONS=true

fi



MOUSE_DRIVER=mouse

IS_VIRT=

if which vmmouse_detect >/dev/null 2>&1; then

  if vmmouse_detect > /dev/null ; then

    MOUSE_DRIVER=vmmouse

    IS_VIRT=true

  fi

fi



exec 4>"$DEXCONFTMPDIR/InputDeviceMouse"

cat >&4 <<SECTION

Section "InputDevice"

        Identifier        "Configured Mouse"

        Driver                "$MOUSE_DRIVER"

        Option                "CorePointer"

SECTION

if [ -n "$DO_EMULATE3BUTTONS" ]; then

  printf "\tOption\t\t\"Emulate3Buttons\"\t\"true\"\n" >&4

fi

if [ -n "$IS_VIRT" ]; then

  printf "\tOption\t\t\"Device\"\t\"/dev/input/mice\"\n" >&4

fi

printf "EndSection\n" >&4



if [ -n "$LAPTOP" ]; then

  cat >&4 <<SECTION



Section "InputDevice"

        Identifier        "Synaptics Touchpad"

        Driver                "synaptics"

        Option                "SendCoreEvents"        "true"

        Option                "Device"                "/dev/psaux"

        Option                "Protocol"                "auto-dev"

        Option                "HorizEdgeScroll"        "0"

EndSection

SECTION

fi



### DEVICE



db_get xserver-$SERVER/config/device/driver

DEVICE_DRIVER="$RET"

db_get xserver-$SERVER/config/device/bus_id

DEVICE_BUSID="$RET"

db_get xserver-$SERVER/config/device/use_fbdev

DEVICE_USE_FBDEV="$RET"



QEMU_KVM=$(grep "QEMU Virtual CPU" /proc/cpuinfo || true)

if [ -n "$QEMU_KVM" ]; then

    DEVICE_DRIVER="cirrus"

fi



exec 4>"$DEXCONFTMPDIR/Device"

cat >&4 <<SECTION

Section "Device"

        Identifier        "Configured Video Device"

SECTION

if [ -n "$DEVICE_DRIVER" ]; then

  printf "\tDriver\t\t\"$DEVICE_DRIVER\"\n" >&4

fi

PS3_FB=$(grep -i PS3 /proc/fb 2>/dev/null || true)

if [ -n "$PS3_FB" ]; then

  printf "\tOption\t\t\"ShadowFB\"\t\t\"false\"\n" >&4

fi

if [ -n "$DEVICE_BUSID" ]; then

  printf "\tBusID\t\t\"$DEVICE_BUSID\"\n" >&4

fi

if [ "$DEVICE_USE_FBDEV" = "true" ]; then

  printf "\tOption\t\t\"UseFBDev\"\t\t\"$DEVICE_USE_FBDEV\"\n" >&4

fi

printf "EndSection\n" >&4



### MONITOR



exec 4>"$DEXCONFTMPDIR/Monitor"

cat >&4 <<SECTION

Section "Monitor"

        Identifier        "Configured Monitor"

SECTION



if [ -n "$QEMU_KVM" ]; then

  printf "\tHorizSync\t30-70\n" >&4

  printf "\tVertRefresh\t50-160\n" >&4

fi

cat >&4 <<SECTION

EndSection

SECTION



### SCREEN



exec 4>"$DEXCONFTMPDIR/Screen"

cat >&4 <<SECTION

Section "Screen"

        Identifier        "Default Screen"

        Monitor                "Configured Monitor"

        Device                "Configured Video Device"

SECTION

if [ -n "$PS3_FB" ]; then

  printf "\tDefaultFbBpp 32\n" >&4

fi

if [ -n "$QEMU_KVM" ]; then

cat >&4 <<SUBSECTION

        Device                "Configured Video Device"

        DefaultDepth        24

        SubSection "Display"

                Depth        24

                Modes        "1280x800" "1152x768" "1024x768" "800x600" "640x480"

        EndSubSection

SUBSECTION

fi

printf "EndSection\n" >&4



### SERVERLAYOUT



exec 4>"$DEXCONFTMPDIR/ServerLayout"

cat >&4 <<SECTION

Section "ServerLayout"

        Identifier        "Default Layout"

        Screen                "Default Screen"

SECTION

if [ -n "$LAPTOP" ]; then

  printf "\tInputDevice\t\"Synaptics Touchpad\"\n" >&4

fi

printf "EndSection\n" >&4



# Close file descriptor 4 before we delete temporary files

exec 4<&-



# Tell debconf to stop listening to us.

db_stop



# Write the configuration file.  Put a blank line before every section we write

# except the first.



OUTFILE="$DEXCONFTMPDIR/dexconf-out"

umask 022

: >"$OUTFILE"



SPACER=

for SECTION in Header Files InputDeviceKeyboard InputDeviceMouse \

              Device Monitor Screen ServerLayout; do

  if [ -e "$DEXCONFTMPDIR/$SECTION" ]; then

    eval $SPACER

    cat "$DEXCONFTMPDIR/$SECTION" >>"$OUTFILE"

    SPACER='echo "" >>"$OUTFILE"'

  fi

done



# Ensure we can write to our destination if it already exits.

if [ -e "$XF86CONFIG" ]; then

  if [ ! -w "$XF86CONFIG" ]; then

    bomb "unable to write to \"$XF86CONFIG\""

  fi

fi



BACKUP=

# Create a backup of the existing configuration file if it already exists.

if [ -e "$XF86CONFIG" ]; then

  cat "$XF86CONFIG" >"$DEXCONFTMPDIR/backup"

  BACKUP=true

fi



# Move the new file into place.

if ! cat "$OUTFILE" >"$XF86CONFIG"; then

  # Failed; try to restore the backup.

  if [ -n "$BACKUP" ]; then

    cat "$DEXCONFTMPDIR/backup" >"$XF86CONFIG"

  fi

fi



rm -rf "$DEXCONFTMPDIR"



exit 0



# vim:set ai et sts=2 sw=2 tw=80: