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/*
* Copyright (C) 2009-2011 the libgit2 contributors
*
* This file is part of libgit2, distributed under the GNU GPL v2 with
* a Linking Exception. For full terms see the included COPYING file.
*/
#include "git2/remote.h"
#include "git2/oid.h"
#include "git2/refs.h"
#include "git2/revwalk.h"
#include "common.h"
#include "transport.h"
#include "remote.h"
#include "refspec.h"
#include "fetch.h"
static int filter_wants(git_remote *remote)
{
git_vector list;
git_headarray refs;
git_remote_head *head;
git_transport *t = remote->transport;
git_repository *repo = remote->repo;
const git_refspec *spec;
int error;
unsigned int i = 0;
error = git_vector_init(&list, 16, NULL);
if (error < GIT_SUCCESS)
return error;
error = t->ls(t, &refs);
if (error < GIT_SUCCESS) {
error = git__rethrow(error, "Failed to get remote ref list");
goto cleanup;
}
/*
* The fetch refspec can be NULL, and what this means is that the
* user didn't specify one. This is fine, as it means that we're
* not interested in any particular branch but just the remote's
* HEAD, which will be stored in FETCH_HEAD after the fetch.
*/
spec = git_remote_fetchspec(remote);
/*
* We need to handle HEAD separately, as we always want it, but it
* probably won't matcht he refspec.
*/
head = refs.heads[0];
if (refs.len > 0 && !strcmp(head->name, GIT_HEAD_FILE)) {
if (git_odb_exists(repo->db, &head->oid))
head->local = 1;
else
remote->need_pack = 1;
i = 1;
error = git_vector_insert(&list, refs.heads[0]);
if (error < GIT_SUCCESS)
goto cleanup;
}
for (; i < refs.len; ++i) {
head = refs.heads[i];
/* If it doesn't match the refpec, we don't want it */
error = git_refspec_src_match(spec, head->name);
if (error == GIT_ENOMATCH)
continue;
if (error < GIT_SUCCESS) {
error = git__rethrow(error, "Error matching remote ref name");
goto cleanup;
}
/* If we have the object, mark it so we don't ask for it */
if (git_odb_exists(repo->db, &head->oid))
head->local = 1;
else
remote->need_pack = 1;
error = git_vector_insert(&list, head);
if (error < GIT_SUCCESS)
goto cleanup;
}
remote->refs.len = list.length;
remote->refs.heads = (git_remote_head **) list.contents;
return GIT_SUCCESS;
cleanup:
git_vector_free(&list);
return error;
}
/*
* In this first version, we push all our refs in and start sending
* them out. When we get an ACK we hide that commit and continue
* traversing until we're done
*/
int git_fetch_negotiate(git_remote *remote)
{
int error;
git_transport *t = remote->transport;
error = filter_wants(remote);
if (error < GIT_SUCCESS)
return git__rethrow(error, "Failed to filter the reference list for wants");
/* Don't try to negotiate when we don't want anything */
if (remote->refs.len == 0)
return GIT_SUCCESS;
if (!remote->need_pack)
return GIT_SUCCESS;
/*
* Now we have everything set up so we can start tell the server
* what we want and what we have.
*/
return t->negotiate_fetch(t, remote->repo, &remote->refs);
}
int git_fetch_download_pack(char **out, git_remote *remote)
{
if(!remote->need_pack) {
*out = NULL;
return GIT_SUCCESS;
}
return remote->transport->download_pack(out, remote->transport, remote->repo);
}
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