#!/bin/bash
#------------------------------------------------------------------------------
# Build links from the directory $PATH1 to all subdirectories of $PATH2.
# For example, if the directories /bar/one and /bar/two existed, then:
#   build_links /foo /bar
# would build the links from /foo/one -> /bar/one, and /foo/two -> /bar/two.
#
# Bugs:
# -- We would link files in /bar are ignored, so only links to directories
#    are actually built.
# -- This script builds useless links if $PATH2 isn't a fully-qualified
#    directory, i.e. "/u/schlegel/dirname", not "dirname".
#
# $Id: build_links 17973 2012-02-10 19:06:45Z weaver $
#------------------------------------------------------------------------------
#
# Demand that both a source and destination directory are specified.
#
if [ $# != 2 ] ; then
    echo "Need to specify a source and destination directory, i.e."
    echo '  "build_links /foo /bar"'
    exit 1
fi
path1=$1
path2=$2
if [ "${path1}" = "${path2}" ] ; then
    echo "The source and destination directories cannot be the same!"
    exit 1
fi
for dirname in $(/bin/ls -d ${path2}/*); do
    if [ -d ${dirname} ]; then
        shortname=$(basename ${dirname})
        if [ -e "${path1}/${shortname}" ] ; then
            echo "Removing old link for ${path1}/${shortname}"
            /bin/rm ${path1}/${shortname}
        fi
        echo "Linking ${path1}/${shortname} -> ${path2}/${shortname}"
        /bin/ln -s ${path2}/${shortname} ${path1}/${shortname}
    fi
done