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   to=`cd $temp && /bin/pwd`
  31   to="$to/`echo $1 | sed 's%.*/\([^/][^/]*\)$%\1%'`"
  32 fi
  33 to=`echo $to | sed 's%^/%%'`
  34
  35 if test -d $2; then
  36   from=`echo $2 | sed 's%/*$%%'`
  37 else
  38   from=`echo $2 | sed 's%/*[^/]*$%%'`
  39 fi
  40
  41 if test -z "$from"; then
  42   from=`/bin/pwd | sed 's%^/%%'`
  43 else
  44   from=`cd $from && /bin/pwd | sed 's%^/%%'`
  45 fi
  46
  47 while test -n "$to" && test -n "$from"; do
  48   preto=`echo $to | sed 's%^\([^/]*\)/.*%\1%'`
  49   prefrom=`echo $from | sed 's%^\([^/]*\)/.*%\1%'`
  50
  51   test "$preto" != "$prefrom" && break
  52
  53   to=`echo $to | sed 's%^[^/]*/*\(.*\)$%\1%'`
  54   from=`echo $from | sed 's%^[^/]*/*\(.*\)$%\1%'`
  55 done
  56
  57 while test -n "$from"; do
  58   rfrom="../$rfrom"
  59   from=`echo $from | sed 's%^[^/]*/*%%'`
  60 done
  61
  62 ln -s $rfrom$to $2