dulwich-users team mailing list archive

[Andi McClure <andi.m.mcclure@xxxxxxxxx>]

Thanks! What I'm personally trying to do is interface with Github. I don't
know what extensions they do or don't support.

So, I'm not sure I understand what to do here. ZERO_SHA1 is just 160 bits
of 0x00, right? I tried this and it didn't seem to work. What I'm doing is
again, the "changed" function which is my second argument to send_pack,
when this function is called it gets in a mapping of all git repository
heads to their corresponding git shas, I change the value associated with
(for example) "refs/heads/bullet279" in this dictionary to ("00"*20) and
return the modified dictionary. As far as I can tell (?) returning this
dictionary rewrites what all the ref names point to during the pack-- the
only point of the generate_pack_contents on the other hand seems (?) to be
to return object files given a sha (the shas returned by
determine_wants??). However when I set one of these to the 20-bytes-of-zero
hash and return it, it appears to have no effect on the Github side. I
don't get an error or anything, just... nothing happens. Any idea what I
might be doing wrong, or how to debug this further? I'm using Dulwich 0.8.2.

By the way, there might be room for improvement in the documentation here.
If you look at the GitClient documentation:
http://www.samba.org/~jelmer/dulwich/apidocs/dulwich.client.GitClient.html#send_pack
send_pack does not have its "determine_wants" argument documented at all.
The fetch() method documents an argument by that name with "Optional
function to determine what refs to fetch", but this doesn't seem to answer
questions like, what are the arguments to this optional function and what
does it return? The description of the generate_pack_contents argument of
send_pack is similarly vague in terms of what this function takes as an
argument and what it returns (I'm afraid I'm misunderstanding what it does
completely...).

Thanks again.

On Wed, Jul 4, 2012 at 3:34 PM, Jelmer Vernooij <jelmer@xxxxxxxxx> wrote:

> On Tue, Jul 03, 2012 at 11:04:30PM -0700, Andi McClure wrote:
> > Hello, I am trying to patch the "hg-git" project, which is based on
> > Dulwich. I do not understand very much about what I am doing and am
> mostly
> > working by studying the surrounding code. What I am trying to do is add a
> > feature where I delete a remote branch by name.
>
> > As far as I can tell, the way I'm meant to communicate with the server is
> > to call
> > client.send_pack(path, changed, genpack)
> > where client is a GitClient object, path is the appropriate git path,
> > "changed" is a method taking a dictionary of branch-name
> > ->branch-points-to-rev and returning a new dictionary describing same,
> and
> > "genpack" is dulwich.object_store.BaseObjectStore.generate_pack_contents.
> > The existing hg-git code uses this interface to upload objects and assign
> > refs.
>
> > How can I use the GitClient object to *delete* a ref, though?
> You should be able to do this by setting a particular ref to the
> ZERO_SHA1.
>
> Note that the server has to support the 'delete-refs' capability for
> this to work.
>
> Cheers,
>
> Jelmer
>