rellns-sh

   1 #! /bin/sh
   2 # rellns-sh - Simplified ln program to generate relative symbolic link.
   3 # Copyright (C) 1996 Free Software Foundation, Inc.
   4 # Written by Ulrich Drepper <drepper@cygnus.com>, October 1996
   5 #
   6 # This program is free software; you can redistribute it and/or modify
   7 # it under the terms of the GNU General Public License as published by
   8 # the Free Software Foundation; either version 2, or (at your option)
   9 # any later version.
  10 #
  11 # This program is distributed in the hope that it will be useful,
  12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 # GNU General Public License for more details.
  15 #
  16 # You should have received a copy of the GNU General Public License
  17 # along with this program; if not, write to the Free Software
  18 # Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19
  20 if test $# -ne 2; then
  21   echo "Usage: rellns SOURCE DEST"
  22   exit 1
  23 fi
  24
  25 case $1 in
  26 /*)
  27   # Make both paths absolute.
  28   to=`echo $1 | sed 's%^/%%'`
  29
  30   if test -d $2; then
  31     from=`echo $2 | sed 's%/*$%%'`
  32   else
  33     from=`echo $2 | sed 's%/*[^/]*$%%'`
  34   fi
  35
  36   case "$from" in
  37   /*) from=`echo $from | sed 's%^/*%%'` ;;
  38   ?*) from=`cd $from && pwd | sed 's%^/%%'` ;;
  39   *) from=`pwd | sed 's%^/%%'` ;;
  40   esac
  41
  42   while test -n "$to" && test -n "$from"; do
  43     preto=`echo $to | sed 's%^\([^/]*\)/.*%\1%'`
  44     prefrom=`echo $from | sed 's%^\([^/]*\)/.*%\1%'`
  45
  46     test "$preto" != "$prefrom" && break
  47
  48     to=`echo $to | sed 's%^[^/]*/*\(.*\)$%\1%'`
  49     from=`echo $from | sed 's%^[^/]*/*\(.*\)$%\1%'`
  50   done
  51
  52   while test -n "$from"; do
  53     rfrom="../$rfrom"
  54     from=`echo $from | sed 's%^[^/]*/*%%'`
  55   done
  56
  57   ln -s $rfrom$to $2
  58   ;;
  59 *)
  60   # Nothing to do, the path is already relative.
  61   ln -s $1 $2
  62   ;;
  63 esac