How to remove old source file?

[Till Maas]

On Sun, Nov 15, 2015 at 08:01:15PM +0100, Kevin Kofler wrote:

> Detecting obsolete tarballs is not what git status is for. It should only be 
> listing files that really need to be added to git (or to the lookaside 
> cache).

It also breaks git clean which is used to clean files. What is the
reason that making .gitignore append-only would be useful btw?
What is the proper way in your opinion to clean all tarball but the
required ones?

Regards
Till