#! /bin/sh
# xinit-auth --- start X with authorization cookies

# Copyright (C) 1995 Noah S. Friedman

# Author: Noah Friedman <friedman@prep.ai.mit.edu>
# Created: 1995-07-10

# $Id: xinit-auth,v 1.3 1996/06/26 17:27:08 friedman Exp $

# This program is free software; you can 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 program 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
# along with this program; if not, you can either send email to this
# program's maintainer or write to: The Free Software Foundation,
# Inc.; 59 Temple Place, Suite 330; Boston, MA 02111-1307, USA.

# Commentary:
# Code:

# Name by which this script was invoked.
progname=`echo "$0" | sed -e 's/[^\/]*\///g'`

# To prevent hairy quoting and escaping later.
bq='`'
eq="'"

usage="Usage: $progname {options}

Options are:
-D, --debug                  Turn on shell debugging ($bq${bq}set -x$eq$eq).
-h, --help                   You're looking at it.
-l, --long-option    ARG     Example option that takes gratuitous argument.
-v, --verbose                Be verbose.
"

# Initialize variables.
# Don't use `unset' since old bourne shells don't have this command.
# Instead, assign them an empty value.
debug=
verbose=

# Clever way to save arguments whilst preserving quoting.
# Note that only one set of args can be saved at a time.
# Usage: eval "$save_current_args"
#        eval "$restore_saved_args"
save_current_args='
  {
    _saved_args=
    while : ; do
      case $# in 0 ) break ;; esac
      eval _saved_args$#=\$1
      _saved_args="$_saved_args \"\$_saved_args$#\""
      shift
    done
    eval "$restore_saved_args"
  }'
restore_saved_args='
  {
    eval '\''{ eval set fnord $_saved_args ; }'\''
    shift
  }'

# Usage: eval "$getopt"; value=$optarg
# or     optarg_optional=t; eval "$getopt"; value=$optarg
#
# This function automatically shifts the positional args as appropriate.
# The argument to an option is optional if the variable `optarg_optional'
# is non-empty.  Otherwise, the argument is required and getopt will cause
# the program to exit on an error.  optarg_optional is reset to be empty
# after every call to getopt.  The argument (if any) is stored in the
# variable `optarg'.
#
# Long option syntax is `--foo=bar' or `--foo bar'.  2nd argument
# won't get used if first long option syntax was used.
#
# Note: because of broken bourne shells, using --foo=bar syntax can
# actually screw the quoting of args that end with trailing newlines.
# Specifically, most shells strip trailing newlines from substituted
# output, regardless of quoting.
getopt='
  {
    optarg=
    case "$1" in
      --*=* )
        optarg=`echo "$1" | sed -e "1s/^[^=]*=//"`
        shift
       ;;
      * )
        case ${2+set} in
          set )
            optarg="$2"
            shift
            shift
           ;;
          * )
            case "$optarg_optional" in
              "" )
                case "$1" in
                  --*=* ) option=`echo "$1" | sed -e "1s/=.*//;q"` ;;
                  * ) option="$1" ;;
                esac
                exec 1>&2
                echo "$progname: option $bq$option$eq requires argument."
                echo "$progname: use $bq--help$eq to list option syntax."
                exit 1
               ;;
           esac
         ;;
        esac
     ;;
    esac
    optarg_optional=
  }'

# Parse command line arguments.
# Make sure that all wildcarded options are long enough to be unambiguous.
# It's a good idea to document the full long option name in each case.
# Long options which take arguments will need a `*' appended to the
# canonical name to match the value appended after the `=' character.
while : ; do
  case $# in 0) break ;; esac
  case "$1" in
    -D | --debug | --d* )
      debug=t
      shift
     ;;
    -h | --help | --h )
      echo "$usage" 1>&2
      exit 0
     ;;
    # Provided as an example of how to process options with arguments
    -l | --long-option* | --l* )
      eval "$getopt"
      option_arg=$optarg
     ;;
    -v | --verbose | --v* )
      verbose=t
      shift
     ;;
    -- )     # Stop option processing
      shift
      break
     ;;
    -* )
      case "$1" in
        --*=* ) arg=`echo "$1" | sed -e 's/=.*//'` ;;
        * )     arg="$1" ;;
      esac
      exec 1>&2
      echo "$progname: unknown or ambiguous option $bq$arg$eq"
      echo "$progname: Use $bq--help$eq for a list of options."
      exit 1
     ;;
    * )
      break
     ;;
  esac
done

case "$debug" in t ) set -x ;; esac

# Find out if any server options were already specified on the command
# line.  If not, add -- before the -auth option.
server_option_separator='--'
for f in ${1+"$@"} ; do
  case "$f" in
    -- )
      server_option_separator=
      break
     ;;
  esac
done

XAUTHORITY=${XAUTHORITY-$HOME/.Xauthority}
set fnord ${1+"$@"} $server_option_separator -auth $XAUTHORITY

case "$server_options_p" in
  t ) : ;;
  * ) set fnord ${1+"$@"}
# TODO: finish this
 ;;
esac


randomkey=`perl -e '
  for (1..10)
    {
      srand(time+$$+$seed);
      printf ("%4.4lx", ($seed = int (rand (65536))));
    }
  print "\n";
'`

HOSTNAME=${HOSTNAME-`hostname`}
xauth add ${HOSTNAME}/unix:0 . "$randomkey"
xauth add ${HOSTNAME}:0 . "$randomkey"

exec xinit ${1+"$@"}

# xinit-auth ends here