mirror of git://sourceware.org/git/glibc.git
80 lines
2.5 KiB
Bash
Executable File
80 lines
2.5 KiB
Bash
Executable File
#! /bin/sh
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# rellns-sh - Simplified ln program to generate relative symbolic link.
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# Copyright (C) 1996, 1997 Free Software Foundation, Inc.
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# Written by Ulrich Drepper <drepper@cygnus.com>, October 1996
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2, or (at your option)
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# any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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if test $# -ne 2; then
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echo "Usage: rellns SOURCE DEST" >&2
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exit 1
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fi
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# A problem with this script is that we must be able to handle symbolic
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# links somewhere in the paths of either path. To resolve symlinks we use
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# the `pwd' program. But some `pwd' programs are no real programs but
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# instead aliases (defined by the user) or builtins (as in bash-2). Both
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# kinds have in common that they might not give the correct result. E.g.,
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# the builtin in bash-2 returns the path which was used to change to the
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# directory and not the real path.
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#
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# To prevent this problem we make sure the real `pwd' somewhere in the
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# path is used. Currently there is only support for bash-2 available.
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# If other shells also have problems we have to add more code here.
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if test "$BASH_VERSINFO" = "2"; then
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unalias pwd
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unset pwd
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enable -n pwd
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fi
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# Make both paths absolute.
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if test -d $1; then
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to=`cd $1 && pwd`
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else
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temp=`echo $1 | sed 's%/*[^/]*$%%'`
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to=`cd $temp && pwd`
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to="$to/`echo $1 | sed 's%.*/\([^/][^/]*\)$%\1%'`"
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fi
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to=`echo $to | sed 's%^/%%'`
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if test -d $2; then
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from=`echo $2 | sed 's%/*$%%'`
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else
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from=`echo $2 | sed 's%/*[^/]*$%%'`
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fi
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if test -z "$from"; then
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from=`pwd`;
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fi
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from=`cd $from && pwd | sed 's%^/%%'`
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while test -n "$to" && test -n "$from"; do
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preto=`echo $to | sed 's%^\([^/]*\)/.*%\1%'`
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prefrom=`echo $from | sed 's%^\([^/]*\)/.*%\1%'`
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test "$preto" != "$prefrom" && break
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to=`echo $to | sed 's%^[^/]*/*\(.*\)$%\1%'`
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from=`echo $from | sed 's%^[^/]*/*\(.*\)$%\1%'`
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done
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while test -n "$from"; do
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rfrom="../$rfrom"
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from=`echo $from | sed 's%^[^/]*/*%%'`
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done
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ln -s $rfrom$to $2
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