Re: More problems...

[Petr Baudis <pasky@ucw.cz>]

Dear diary, on Tue, May 03, 2005 at 12:19:16AM CEST, I got a letter
where Linus Torvalds <torvalds@osdl.org> told me that...
> But for "normal" situations, where you have a tree or two, the hardlinking 
> win might not be big enough to warrant the maintenance headache. With 
> hardlinking, you _do_ need to "trust" the other trees to some degree.

As long as the trees aren't yours and you aren't doing something really
horrible with them...

$ time git-local-pull -a -l $(cat ~/git-devel/.git/HEAD) ~/git-devel/.git/
real    0m0.332s

$ time git-local-pull -a $(cat ~/git-devel/.git/HEAD) ~/git-devel/.git/
real    0m4.306s

And this is only 13M Cogito objects database. I think one of the
important things is to encourage branching, therefore it must be fast
enough; that's why I really wanted to do hardlinks. The disk space is
important, but the speed hit probably equally (if not more) so.

BTW, the object database files should have 0444 or such; they really
_are_ read-only and making them so mode-wise could help against some
mistakes too.

It's clear that Cogito should have a way to choose whether to hardlink
or copy; the question is which one should be the default one and how
should it be specified.  I thought about using file:// vs. just local
path to differentiate between copy and hardlinking, but that'd be
totally non-obvious, therefore bad UI-wise.

BTW, I've just committed support for pulling from remote repositories
over the HTTP and SSH protocols (http://your.git/repo,
git+ssh://root@git.nasa.gov/srv/git/mars) (note that I was unable to
test the SSH stuff properly now; success reports or patches welcome).
Also, the local hardlinking access is now done over git-local-pull,
therefore the cp errors should go away now.

I'm not yet decided whether locations like

	kernel.org:/pub/scm/cogito/cogito.git

should invoke rsync, rpull, throw an error or print a fortune cookie.

-- 
				Petr "Pasky" Baudis
Stuff: http://pasky.or.cz/
C++: an octopus made by nailing extra legs onto a dog. -- Steve Taylor