Educated guess the VBGuest.iso

config.rb

    
def autodetect_iso!
  if !@iso_path

    iso_path = if Vagrant::Util::Platform.linux?
      "/usr/share/virtualbox/VBoxGuestAdditions.iso"
    elsif Vagrant::Util::Platform.darwin?
      "/Applications/VirtualBox.app/Contents/MacOS/VBoxGuestAdditions.iso"
    elsif Vagrant::Util::Platform.windows?
      "%PROGRAMFILES%/VirtualBox/VBoxGuestAdditions.iso"
    end
    
    if !File.exists?(iso_path)
      dvd = VirtualBox::DVD.all.find do |d|
        !!(d.location =~ /VBoxGuestAdditions.iso$/)
      end
      iso_path = dvd.location if dvd
    end
  
  end
end

• can we use windows environment variables ?
• where exactly is the iso located on windows ?
• do we want to allow an array of possible locations, say ["/usr/share/...", "/opt/..."] for linux ?
• what about generic darvin, *bsd?