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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"

static int maybe_want(git_remote *remote, git_remote_head *head, git_odb *odb, git_refspec *tagspec)

{

int match = 0;

if (!git_reference_is_valid_name(head->name))

return 0;

if (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(tagspec, head->name))

match = 1;

else

return 0;

} else if (git_remote__matching_refspec(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(odb, &head->oid)) {

head->local = 1;

}

else

remote->need_pack = 1;

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

}

static int filter_wants(git_remote *remote)

{

git_remote_head **heads;

git_refspec tagspec, head;

int error = 0;

git_odb *odb;

size_t i, heads_len;

git_vector_clear(&remote->refs);

if ((error = 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.

*/

if (remote->active_refspecs.length == 0) {

if ((error = git_refspec__parse(&head, "HEAD", true)) < 0)

goto cleanup;

error = git_refspec__dwim_one(&remote->active_refspecs, &head, &remote->refs);

git_refspec__free(&head);

if (error < 0)

goto cleanup;

}

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

goto cleanup;

if (git_remote_ls((const git_remote_head ***)&heads, &heads_len, remote) < 0)

goto cleanup;

for (i = 0; i < heads_len; i++) {

if ((error = maybe_want(remote, heads[i], odb, &tagspec)) < 0)

break;

}

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;

remote->need_pack = 0;

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->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_transport *t = remote->transport;

if (!remote->need_pack)

return 0;

return t->download_pack(t, remote->repo, &remote->stats,

remote->callbacks.transfer_progress, remote->callbacks.payload);

}