On Fri, 16 Jun 2006, Goo GGooo wrote:
>
> That's confusing - I believed all protocols should behave the same way...?
Not really. The primary protocol is the native git one, and the others try
to do a best effort, but the http protocol really can't do a very good
job unless the server side has run "git update-server-info" to help the
http client along.
I suspect that the -mm git tree simply doesn't do that. In fact, even the
main tree didn't use to do it, but I finally just broke down and added the
proper hook to make it always do it automatically when I push.
(In case Andrew wants to do that, the way to do it is:
echo -e "#!/bin/sh\nexec git-update-server-info" > hooks/post-update
chmod +x hooks/post-update
inside the git repository - all it will do is always execute that script,
and this "git-update-server-info", after you've updated the repo).
Finally, the rsync protocol just copies all objects over, and since it
doesn't even know _which_ objects it is getting, it doesn't do the normal
tag following that the native git protocol does.
So to recap:
- http is fundamentally weaker, and needs some server-side help to work
- rsync is fine for the initial clone, but doesn't actually know what
it's doing, so the end result can actually even be a corrupted
repository, because you happened to rsync just as it was updating.
- the native git protocol generally should be considered the golden
standard, where the other ones are just fallbacks in case of problems
(like firewalls that don't let git:// through, or more commonly hosted
servers that don't do the git protocol at all).
Which hopefully clarifies the issue a bit.
Linus
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