Linus on the BK withdrawal [LWN.net]

Linus on the BK withdrawal

Posted Apr 7, 2005 20:31 UTC (Thu) by kasperd (guest, #11842)
In reply to: Linus on the BK withdrawal by hppnq
Parent article: Linus on the BK withdrawal

> he won't do anything to actively help anyone reverse engineer the inner magic of BitKeeper.

What is this inner magic of which he talks? Good heuristics to merge branches and avoid conflicts? I don't think there is much magic in software. Good heuristics is what looks most like magic to me.

Reverse engineering the formats and protocols isn't necesarilly the same as reverse engineering the heuristics. But of course when you do reverse engineering it may not be possible to reverse engineer exactly the right corner of the code, and you may end find out a lot more than what you really needed.

Had formats and protocols been published the reverse engineering rights had no longer applied. And maybe that way BitMover could have forbidden me to reverse engineer the code.

So in some sense publishing more information could have made it harder to (legally) reverse engineer the inner magic of BitKeeper.

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Linus on the BK withdrawal

Posted Apr 7, 2005 22:06 UTC (Thu) by hppnq (subscriber, #14462) [Link]

I can't really follow you here, I'm afraid. Maybe it's because I'm much too lazy to reverse engineer a program, I'd much rather spend my time trying to reverse engineer the programmer who wrote the program, for instance, and start from there (not that I am particularly good at it ;-). Or is that what you call "reverse engineering heuristics"?

You seem to suggest that it can't be that hard to write a non-trivial piece of software. I'm quite sure any kernel hacker would agree with me that, looking at random bits and pieces of an OS kernel, none would look too complicated. The general operation of an OS kernel is no rocket science either. Getting everything right all the time, however, that's much more like black magic. (Funnily enough, in physics the exact same problem is related to "degrees of freedom". The similarity doesn't end there, but I won't bore you with that. ;-)

(The term "inner magic", by the way, is not Larry's, as far as I know, if that is of some importance to you.)