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#! /bin/sh
# rellns-sh - Simplified ln program to generate relative symbolic link.
# Copyright (C) 1996, 1997 Free Software Foundation, Inc.
# Written by Ulrich Drepper <drepper@cygnus.com>, October 1996
#
# 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, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
if test $# -ne 2; then
echo "Usage: rellns SOURCE DEST" >&2
exit 1
fi
# A problem with this script is that we must be able to handle symbolic
# links somewhere in the paths of either path. To resolve symlinks we use
# the `pwd' program. But some `pwd' programs are no real programs but
# instead aliases (defined by the user) or builtins (as in bash-2). Both
# kinds have in common that they might not give the correct result. E.g.,
# the builtin in bash-2 returns the path which was used to change to the
# directory and not the real path.
#
# To prevent this problem we make sure the real `pwd' somewhere in the
# path is used. Currently there is only support for bash-2 available.
# If other shells also have problems we have to add more code here.
if test "$BASH_VERSINFO" = "2"; then
unalias pwd
unset pwd
enable -n pwd
fi
# Make both paths absolute.
if test -d $1; then
to=`cd $1 && pwd`
else
temp=`echo $1 | sed 's%/*[^/]*$%%'`
to=`cd $temp && pwd`
to="$to/`echo $1 | sed 's%.*/\([^/][^/]*\)$%\1%'`"
fi
to=`echo $to | sed 's%^/%%'`
if test -d $2; then
from=`echo $2 | sed 's%/*$%%'`
else
from=`echo $2 | sed 's%/*[^/]*$%%'`
fi
if test -z "$from"; then
from=`pwd`;
fi
from=`cd $from && pwd | sed 's%^/%%'`
while test -n "$to" && test -n "$from"; do
preto=`echo $to | sed 's%^\([^/]*\)/.*%\1%'`
prefrom=`echo $from | sed 's%^\([^/]*\)/.*%\1%'`
test "$preto" != "$prefrom" && break
to=`echo $to | sed 's%^[^/]*/*\(.*\)$%\1%'`
from=`echo $from | sed 's%^[^/]*/*\(.*\)$%\1%'`
done
while test -n "$from"; do
rfrom="../$rfrom"
from=`echo $from | sed 's%^[^/]*/*%%'`
done
ln -s $rfrom$to $2
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