#!/bin/sh
#
# rsh_status
# 
# AUTHOR:
#   Dan Harkless                                                    <opensource@
#   http://harkless.org/dan/software/                              harkless.org>
# 
# COPYRIGHT:
#   This file is Copyright (C) 1998 by Dan Harkless, and is released under the
#   GNU General Public License <http://www.gnu.org/copyleft/gpl.html>.
#
# USAGE:
#   % rsh_status <hostname> [-l <login>] [-n] <remote_command>
#
# DESCRIPTION:
#   rsh/remsh is not as useful as one would like in a script, since the status
#   returned is not the status from the remote command, but from the rsh itself,
#   so unless the machine name or login info was bad, the status is always 0.
#   rsh_status behaves like rsh but returns the exit status from the command on
#   the other end, allowing for the writing of much more fault-tolerant scripts.
#
#   To make this magic happen, rsh_status needs to have an NFS-mounted directory
#   that's available on both systems, and is world-writable (unless you don't
#   use -l, in which case it just needs to be writable by you).  If
#   $RSH_STATUS_DIR is set, that directory will be used.  If not, $HOME/public
#   is assumed.
#
# DATE        MODIFICATION
# ==========  ==================================================================
# 1998-02-25  On AT&T UNIX, rsh is BSD's Rsh, so use remsh, which works on both.
# 1996-12-06  Original.

if [ $# -lt 2 ]; then
    echo "usage: rsh_status <hostname> [-l <login>] [-n] <remote_command>"
    exit 1
fi

rsh_host=$1
shift

using_dash_l=0

while [ "`echo $1 | awk '{print substr($1, 1, 1)}'`" = "-" ]; do
    rsh_options="$rsh_options $1"
    if [ X$1 = X-l ]; then
	using_dash_l=1
	shift
	rsh_options="$rsh_options $1"
    fi
    shift
done

rsh_status_dir=${RSH_STATUS_DIR-$HOME/public}
rsh_status_file=.rsh_status.$HOST.$$

if [ ! -d $rsh_status_dir ]; then
    echo "rsh_status: $rsh_status_dir directory does not exist."
    echo 'rsh_status: Create it or set $RSH_STATUS_DIR to another directory'\
         'and re-run.'
    exit 1
fi

if [ $using_dash_l = 1 ]; then
    if [ `ls -dl $rsh_status_dir | fgrep -c rwxrwxrwx` != 1 ]; then
	echo "rsh_status: $rsh_status_dir must be world-writable.  Aborting."
	exit 1
    fi
else # using -l
    if [ ! -w $rsh_status_dir ]; then
	echo "rsh_status: $rsh_status_dir must be writable.  Aborting."
	exit 1
    fi
fi

trap "rm -f $rsh_status_dir/$rsh_status_file" 0 1 2 3 15
remsh $rsh_host $rsh_options "$*; echo "'$?'" >$rsh_status_dir/$rsh_status_file"
rsh_status=`cat $rsh_status_dir/$rsh_status_file`
exit $rsh_status