Re: FFmpeg considering GIT

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On Fri, 4 May 2007, Michael Niedermayer wrote:
> 
> we have a nice svn policy which explains that, also people wont receive
> write access without having submitted a few clean patches first
> so i dont know if more education would really help, the problems are IMHO
> rather caused by a mix of lazyness, arrogance and plain oversight
> but please dont missunderstand, these problems are not that common, its
> rather once every few month

[ I was away for a few days, so others probably answered already ... ]

With git, the right way to do thigns is to not ever give "write access" to 
the "standard" tree to developers, but to make each developer have their 
own tree, and then one or more developers are the ones that merge other 
peoples work. 

Since I'm the one who does the merging for the kernel, I've made damn sure 
that merging other peoples work is as easy as humanly possible, so that I 
can just sit there, sipping my foofy tropical drink, drunk as a skunk and 
enjoying every moment of seeing my peons work their little fingers to the 
bone, when I do a "git pull ..." and in two seconds I've downloaded their 
work and merged it, and I can take another sip of the Piña Colada. 

Burp.

And git also makes it really easy to see when somebody does something 
stupid. The one thing it always shows to the person doing the merging is 
the diffstat from the result, so if somebody re-indented the source base, 
the merger goes "Whaa", and assuming he's not too drunk to type, he should 
just send a sternly worded message to the developer who did the bad deed, 
and tell them that their work was unacceptable, and won't be pulled.

A simple "git reset --hard ORIG_HEAD" will undo the merge, so the 
person(s) who actually does the integration again doesn't actually have to 
work all that hard.

In other words, the proper sequence really should be to *not* let the 
horribly buggy commits into the standard version in the first place! Sure, 
individual developers will make mistakes, but the fact that they screwed 
up should in _no_ way mean that they can screw up the main repository. The 
whole point in being distributed is that developers can screw up in their 
own _private_ repositories and still have all the power of a proper SCM 
tool, but without actually getting to screw up the main repo.

(And yes, then very occasionally both the developer *and* the maintainer 
screws up, and something bad gets through, and yeah, then you need to 
revert, but the point I'm arguing is that with a fairly good flow of 
development, you don't have to worry about the more clueless people 
screwing up - they can still do development, and you can still pull from 
them, but *if* they screw up, you can tell them to clean up their mess 
*before* you actually put it into any standard tree, and the mess can be 
entirely their _local_ mistake and never visible anywhere else).

			Linus

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