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#!/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
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 NOT USED BY DEXCONF
# ServerFlags Server flags NOT USED BY DEXCONF
# Module Dynamic module loading NOT USED BY DEXCONF
# InputDevice Input device description NOT USED BY DEXCONF
# Device Graphics device description
# VideoAdaptor Xv video adaptor description NOT USED BY DEXCONF
# Monitor Monitor description NOT USED BY DEXCONF
# Modes Video modes descriptions NOT USED BY DEXCONF
# Screen Screen configuration NOT USED BY DEXCONF
# 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>"$DEXCONFTMPDIR/Header"
cat >&4 <<SECTION
# xorg.conf (X.Org X Window System server configuration file)
#
# This file was generated by dexconf, the Debian X Configuration tool, using
# values from the debconf database.
#
# Edit this file with caution, and see the xorg.conf manual page.
# (Type "man xorg.conf" at the shell prompt.)
#
# This file is automatically updated on xserver-xorg package upgrades *only*
# if it has not been modified since the last upgrade of the xserver-xorg
# package.
#
# If you have edited this file but would like it to be automatically updated
# again, run the following command:
# sudo dpkg-reconfigure -phigh xserver-xorg
SECTION
### DEVICE
db_get xserver-$SERVER/config/device/bus_id
DEVICE_BUSID="$RET"
exec 4>"$DEXCONFTMPDIR/Device"
cat >&4 <<SECTION
Section "Device"
Identifier "Configured Video Device"
SECTION
if [ -n "$DEVICE_BUSID" ]; then
printf "\tBusID\t\t\"$DEVICE_BUSID\"\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 Device ; 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:
|
