Replace an iTunes Library with one song. Use at your own risk!

gistfile1.rb

#!/usr/bin/ruby

require 'fileutils'
include FileUtils::Verbose

$rickRollFile="/Volumes/Media/.RickRoll.mp3"

def rickRollDir(sourceDir, destDir)
    for filename in Dir.entries(sourceDir)
        next if filename=~/\.\.?$/
        sourcePath = File.join(sourceDir, filename)
        destPath = File.join(destDir, filename)
        fstat = File.stat(sourcePath)
        case fstat.ftype
            when "file"
                if (filename=~/\.xml$/ || filename=~/iTunes Library$/)
                    copy(sourcePath, destPath)
                    next
                end
                if filename=~/\.m(p3|4a)$/
                    sourcePath = $rickRollFile
                end
                printf("Linking %s to %s\n", sourcePath, destPath)
                begin
                    File.symlink(sourcePath, destPath)
                rescue SystemCallError

                end
            when "directory"
                printf("Creating dir: %s\n", destPath)
                makedirs(destPath)
                rickRollDir(sourcePath, destPath)
        end
    end
end

rickRollDir("/Users/sucker/Music", "/Users/sucker/RRMusic")