StGIT repository not clonable?

StGIT repository not clonable?

[Horst H. von Brand]

I'm trying to update my StGIT repo here, and get a crash from
git-http-fetch (git 1.4.3.4). Trying to clone it anew gives:


[vonbrand@laptop13 tmp]$ git-clone http://homepage.ntlworld.com/cmarinas/stgit.git
error: Unable to start request
error: Could not interpret heads/master as something to pull

What am I doing wrong?
-- 
Dr. Horst H. von Brand                   User #22616 counter.li.org
Departamento de Informatica                    Fono: +56 32 2654431
Universidad Tecnica Federico Santa Maria             +56 32 2654239

Re: StGIT repository not clonable?

[Karl Hasselström]

On 2006-11-11 00:56:47 -0300, Horst H. von Brand wrote:

> I'm trying to update my StGIT repo here, and get a crash from
> git-http-fetch (git 1.4.3.4). Trying to clone it anew gives:
>
> [vonbrand@laptop13 tmp]$ git-clone http://homepage.ntlworld.com/cmarinas/stgit.git
> error: Unable to start request
> error: Could not interpret heads/master as something to pull
>
> What am I doing wrong?

It works for me, with

  $ git --version
  git version 1.4.3.3.g8387

But it's horribly slow. Catalin, have you ever packed that repository?

-- 
Karl Hasselström, kha@treskal.com

Re: StGIT repository not clonable?

[Catalin Marinas]

On 11/11/06, Karl Hasselström <kha@treskal.com> wrote:
> On 2006-11-11 00:56:47 -0300, Horst H. von Brand wrote:
> > I'm trying to update my StGIT repo here, and get a crash from
> > git-http-fetch (git 1.4.3.4). Trying to clone it anew gives:
>
> It works for me, with
>
>   $ git --version
>   git version 1.4.3.3.g8387
>
> But it's horribly slow. Catalin, have you ever packed that repository?

I've never packed it. IIRC, there was some advise in some GIT document
or e-mail saying that you shouldn't pack if the export is over a dumb
protocol. That's good for people pulling regularly but bad for
cloning.

Anyway, thanks to Pasky, you can now pull/clone it over the git
protocol directly - git://repo.or.cz/stgit.git. This repository is up
to date. I have a plan to move the main StGIT repository to Pasky's
server but I'm a bit busy with other things at the moment.

-- 

Re: StGIT repository not clonable?

[Karl Hasselström]

On 2006-11-11 21:59:32 +0000, Catalin Marinas wrote:

> I've never packed it. IIRC, there was some advise in some GIT
> document or e-mail saying that you shouldn't pack if the export is
> over a dumb protocol. That's good for people pulling regularly but
> bad for cloning.

It's _extremely_ bad when cloning. There's a separate HTTP request for
each object in the repository, which means lots of time and lots of
web server load. It's just about doable to clone the StGIT repository
now because it's so small.

-- 
Karl Hasselström, kha@treskal.com

Re: StGIT repository not clonable?

[Jakub Narebski]

Catalin Marinas wrote:

> IIRC, there was some advise in some GIT document
> or e-mail saying that you shouldn't pack if the export is over a dumb
> protocol. That's good for people pulling regularly but bad for
> cloning.

By the way, does dumb protocols download _whole_ packs only? Or do they
download parts of packs (curl can do that, I think)?
-- 
Jakub Narebski
Warsaw, Poland
ShadeHawk on #git

Re: StGIT repository not clonable?

[Petr Baudis]

On Sat, Nov 11, 2006 at 11:48:04PM CET, Jakub Narebski wrote:
> Catalin Marinas wrote:
> 
> > IIRC, there was some advise in some GIT document
> > or e-mail saying that you shouldn't pack if the export is over a dumb
> > protocol. That's good for people pulling regularly but bad for
> > cloning.
> 
> By the way, does dumb protocols download _whole_ packs only? Or do they
> download parts of packs (curl can do that, I think)?

curl can, but it might very easily get even much more expensive than
downloading the whole patch unless your latency is very small and
bandwidth very tight, which would be quite a unusual situation.

It's true that repacking can hurt dumb protocols - if you repack often,
dumb clients will have to re-fetch the single whole patck with all the
stuff they already have plus the few additional objects they are
missing.

But at least packing once can be a huge improvement and won't hurt the
dumb clients since their problem is with incremental fetches.
Furthermore, if you do just repack, not repack -a, the cost for dumb
protocols is quite small (though it's not optimal packing strategy):

It is not unlikely at all that if you have set of unpacked objects A,
client fetches that, then you create set of objects B and then repack,
creating pack(A \cup B), this pack will still be much smaller than the
set of objects B (even if |A| >> |B|) so it's more beneficial even for
the dumb clients to refetch the A objects contained in the pack, instead
of fetching just the unpacked B objects.

By the way, in case of glibc-cvs the pack sice is 104M, and after
importing new CVS changes after few days, the repository size doubled to
200M.  git-repack -a -d brought that _back_ to 104M!

Packs are a funny thing.

-- 
				Petr "Pasky" Baudis
Stuff: http://pasky.or.cz/
#!/bin/perl -sp0777i<X+d*lMLa^*lN%0]dsXx++lMlN/dsM0<j]dsj
$/=unpack('H*',$_);$_=`echo 16dio\U$k"SK$/SM$n\EsN0p[lN*1

Re: StGIT repository not clonable?

[Horst H. von Brand]

Karl Hasselström <kha@treskal.com> wrote:
> On 2006-11-11 00:56:47 -0300, Horst H. von Brand wrote:
> > I'm trying to update my StGIT repo here, and get a crash from
> > git-http-fetch (git 1.4.3.4). Trying to clone it anew gives:
> >
> > [vonbrand@laptop13 tmp]$ git-clone http://homepage.ntlworld.com/cmarinas/stgit.git
> > error: Unable to start request
> > error: Could not interpret heads/master as something to pull
> >
> > What am I doing wrong?
> 
> It works for me, with
> 
>   $ git --version
>   git version 1.4.3.3.g8387

Here it is 1.4.3.4 or 1.4.4.rc2, selfbuilt on i386 (Fedora rawhide up to
date). On sparc, at least 1.4.3.4 works for updating.

> But it's horribly slow. Catalin, have you ever packed that repository?

That isn't the issue for me at least...
-- 
Dr. Horst H. von Brand                   User #22616 counter.li.org
Departamento de Informatica                    Fono: +56 32 2654431
Universidad Tecnica Federico Santa Maria             +56 32 2654239

Re: StGIT repository not clonable?

[Horst H. von Brand]

Catalin Marinas <catalin.marinas@gmail.com> wrote:
> On 11/11/06, Karl Hasselström <kha@treskal.com> wrote:
> > On 2006-11-11 00:56:47 -0300, Horst H. von Brand wrote:
> > > I'm trying to update my StGIT repo here, and get a crash from
> > > git-http-fetch (git 1.4.3.4). Trying to clone it anew gives:
> >
> > It works for me, with
> >
> >   $ git --version
> >   git version 1.4.3.3.g8387

[...]

> Anyway, thanks to Pasky, you can now pull/clone it over the git
> protocol directly - git://repo.or.cz/stgit.git. This repository is up
> to date. I have a plan to move the main StGIT repository to Pasky's
> server but I'm a bit busy with other things at the moment.

Thanks! But the failure to pull/clone the original would mean something is
wrong with your HTTP repo then (or my git setup). Nobody else seeing this?
Strangely, other HTTP repos (e.g., <http://jonas.nitro.dk/tig/tig.git>,
<http://www.spearce.org/projects/scm/pg.git>) work fine. Perhaps git gets
miscompiled with gcc-4.1.1-32 and CFLAGS='-O2 -fomit-frame-pointer' on
i386?
-- 
Dr. Horst H. von Brand                   User #22616 counter.li.org
Departamento de Informatica                    Fono: +56 32 2654431
Universidad Tecnica Federico Santa Maria             +56 32 2654239
Casilla 110-V, Valparaiso, Chile               Fax:  +56 32 2797513