[chef] Newbie question about installing custom software

[< >]

Hello,

I've just started evaluating Chef - so this may be something that's already
covered in the documentation. However, I've not been able to find it - so
asking here.

I've a set of custom software packages (let's say that can be downloaded from 
a
certain location on Amazon S3) which I want to install as part of my automated
machine setup. These are not available as part of any Linux distro's standard
repository, so apt-get/yum won't work.

What is the fastest way to get this working? As I see it, it boils down to
running a custom script. How easy or how hard is it to do in Chef?

- H