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#!/bin/sh
# This script assumes it is being run by bash
# ======= needed functions ======
# abspath relpath curentpath
abspath ()
{
# treat "./" as a special case
if expr "$1" : '\./' >/dev/null; then
b=`echo $1 | sed 's@\./@@'`
echo $2/$b
return 0
fi
b=$1
a=$2
# for each "../" we remove one directory from the current path
# and leading "../" from the relative path
# until we have the unique part in b and the abs prefix in a
while expr "$b" : '\.\./' >/dev/null
do
b=`echo $b | sed 's@\.\./@@'`
a=`echo $a | sed 's@/[^/]*$@@'`
done
# return the completed absolute path
echo $a/$b
}
# relpath abspath curentpath
relpath ()
{
# take "/" off beginning
a=`echo $1 | sed 's@^/@@'`
# take "/" off beginning and add to end
b=`echo $2 | sed 's@^/@@;s@$@/@'`
while true
do
if [ "$b" = "" ]; then
break;
fi
a1=`echo $a | sed 's@\([^/]*\)/.*@\1@'`
b1=`echo $b | sed 's@\([^/]*\)/.*@\1@'`
if [ "$a1" != "$b1" ]; then
break;
fi
a=`echo $a | sed 's@[^/]*/@@'`
b=`echo $b | sed 's@[^/]*/@@'`
done
# a now has the unique part of the path
c=""
# c will have the required number of "../"'s
while [ "$b" != "" ]
do
c="../$c"
b=`echo $b | sed 's@[^/]*/@@'`
done
# return the completed relative path
echo "$c$a"
}
# ====== MAIN ======
# Assume any relative path passed in is relative to the current directory
# Given $1 is a path to the source file
# Given $2 is a path of the link to be created
# Create a link that has the relative path to the source file
# That is, $1 converted relative to $2
# Check if $1 is absolute or already relative
#echo add_rel_link.sh $1 $2
if expr "$1" : '\/' >/dev/null; then
# The source path is absolute, this is the expected case
# Check if $2 is absolute or relative
if expr "$2" : '\/' >/dev/null; then
# The link path is already absolute, so just use it
lpath=$2
else
# The link path is relative, this is the expected case
# WARNING: don't use $PWD here, it won't work right
# WARNING: pwd may be a shell alias. Use /bin/pwd.
cur=`/bin/pwd`
lpath=`abspath $2 $cur`
fi
# take name off the end of the dest
ldir=`echo $lpath | sed 's@/[^/]*$@@'`
# If the original path and the ldir do not originate in the same
# directory tree, we should just use absolute paths
if [ "`echo $1 | cut -d/ -f2`" != "`echo $ldir | cut -d/ -f2`" ]; then
spath=$1
else
spath=`relpath $1 $ldir`
fi
# use the completed relative path and the given destignation path
echo ln -s $spath $2
ln -s $spath $2
else
# The source path is already relative, so just use it
echo ln -s $1 $2
ln -s $1 $2
fi
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