save_args

#!/bin/sh
#
# ``Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# 
# The Initial Developer of the Original Code is Ericsson Utvecklings AB.
# Portions created by Ericsson are Copyright 1999, Ericsson Utvecklings
# AB. All Rights Reserved.''
# 
#     $Id$
#

#
# Usage: save_args <argument storage filename> --- [arguments to save ...]
#

arg_file=
begin_marker=false

for arg
do
    if test "x$arg" = "x---"; then
	shift
	begin_marker=true
	break
    elif test "x$arg_file" = "x"; then
	arg_file=$arg
	shift
    else
	echo "save_args: Unknown argument: $arg" 1>&2
	exit 1
    fi
done

if test "x$arg_file" = "x"; then
    echo "save_args: Missing argument storage filename" 1>&2
    exit 1
fi

if test $begin_marker != true; then
    echo "save_args: No begin marker found" 1>&2
    exit 1
fi

new_args="$@"

if test ! -f $arg_file; then
    echo "$new_args" > $arg_file
    echo "save_args: No previusly saved arguments; created $arg_file"
else
    old_args=`cat $arg_file`
    case "$old_args" in
	"$new_args")
	    echo "save_args: Same arguments as saved; no need to update $arg_file";;
	*)
	    echo "$new_args" > $arg_file
	    echo "save_args: Not same arguments as saved; updated $arg_file";;
    esac
fi