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/*

* Copyright (C) the libgit2 contributors. All rights reserved.

*

* 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/oid.h"

#include "git2/refs.h"

#include "git2/revwalk.h"

#include "git2/transport.h"

#include "common.h"

#include "remote.h"

#include "refspec.h"

#include "pack.h"

#include "fetch.h"

#include "netops.h"

#include "repository.h"

#include "refs.h"

struct filter_payload {

git_remote *remote;

const git_refspec *spec, *tagspec;

git_odb *odb;

int found_head;

};

static int filter_ref__cb(git_remote_head *head, void *payload)

{

struct filter_payload *p = payload;

int match = 0;

if (!git_reference_is_valid_name(head->name))

return 0;

if (!p->found_head && strcmp(head->name, GIT_HEAD_FILE) == 0)

p->found_head = 1;

else if (p->remote->download_tags == GIT_REMOTE_DOWNLOAD_TAGS_ALL) {

/*

* If tagopt is --tags, then we only use the default

* tags refspec and ignore the remote's

*/

if (git_refspec_src_matches(p->tagspec, head->name))

match = 1;

else

return 0;

} else if (git_remote__matching_refspec(p->remote, head->name))

match = 1;

if (!match)

return 0;

/* If we have the object, mark it so we don't ask for it */

if (git_odb_exists(p->odb, &head->oid))

head->local = 1;

else

p->remote->need_pack = 1;

return git_vector_insert(&p->remote->refs, head);

}

static int filter_wants(git_remote *remote)

{

struct filter_payload p;

git_refspec tagspec;

int error = -1;

git_vector_clear(&remote->refs);

if (git_refspec__parse(&tagspec, GIT_REFSPEC_TAGS, true) < 0)

return error;

/*

* 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.

*/

p.tagspec = &tagspec;

p.found_head = 0;

p.remote = remote;

if (git_repository_odb__weakptr(&p.odb, remote->repo) < 0)

goto cleanup;

error = git_remote_ls(remote, filter_ref__cb, &p);

cleanup:

git_refspec__free(&tagspec);

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)

{

git_transport *t = remote->transport;

if (filter_wants(remote) < 0) {

giterr_set(GITERR_NET, "Failed to filter the reference list for wants");

return -1;

}

/* Don't try to negotiate when we don't want anything */

if (remote->refs.length == 0 || !remote->need_pack)

return 0;

/*

* 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,

(const git_remote_head * const *)remote->refs.contents,

remote->refs.length);

}

int git_fetch_download_pack(

git_remote *remote,

git_transfer_progress_callback progress_cb,

void *progress_payload)

{

git_transport *t = remote->transport;

if(!remote->need_pack)

return 0;

return t->download_pack(t, remote->repo, &remote->stats, progress_cb, progress_payload);

}