rellns-sh

   1 #! /bin/sh
   2 # rellns-sh - Simplified ln program to generate relative symbolic link.
   3 # Copyright (C) 1996, 1997 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" >&2
  22   exit 1
  23 fi
  24
  25 # Make both paths absolute.
  26 if test -d $1; then
  27   to=`cd $1 && /bin/pwd`
  28 else
  29   temp=`echo $1 | sed 's%/*[^/]*$%%'`
  30   if test -z "$temp"; then
  31     to=`/bin/pwd`
  32   else
  33     to=`cd $temp && /bin/pwd`
  34   fi
  35   to="$to/`echo $1 | sed 's%.*/\([^/][^/]*\)$%\1%'`"
  36 fi
  37 to=`echo $to | sed 's%^/%%'`
  38
  39 if test -d $2; then
  40   from=`echo $2 | sed 's%/*$%%'`
  41 else
  42   from=`echo $2 | sed 's%/*[^/]*$%%'`
  43 fi
  44
  45 if test -z "$from"; then
  46   from=`/bin/pwd | sed 's%^/%%'`
  47 else
  48   from=`cd $from && /bin/pwd | sed 's%^/%%'`
  49 fi
  50
  51 while test -n "$to" && test -n "$from"; do
  52   preto=`echo $to | sed 's%^\([^/]*\)/.*%\1%'`
  53   prefrom=`echo $from | sed 's%^\([^/]*\)/.*%\1%'`
  54
  55   test "$preto" != "$prefrom" && break
  56
  57   to=`echo $to | sed 's%^[^/]*/*\(.*\)$%\1%'`
  58   from=`echo $from | sed 's%^[^/]*/*\(.*\)$%\1%'`
  59 done
  60
  61 while test -n "$from"; do
  62   rfrom="../$rfrom"
  63   from=`echo $from | sed 's%^[^/]*/*%%'`
  64 done
  65
  66 ln -s $rfrom$to $2