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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 "fetch.h"
#include "git2/oid.h"
#include "git2/refs.h"
#include "git2/revwalk.h"
#include "git2/transport.h"
#include "remote.h"
#include "refspec.h"
#include "pack.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, git_remote_autotag_option_t tagopt)
{
int match = 0;
if (!git_reference_is_valid_name(head->name))
return 0;
if (tagopt == GIT_REMOTE_DOWNLOAD_TAGS_ALL) {
/*
* If tagopt is --tags, always request tags
* in addition to the remote's refspecs
*/
if (git_refspec_src_matches(tagspec, head->name))
match = 1;
}
if (!match && 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, const git_fetch_options *opts)
{
git_remote_head **heads;
git_refspec tagspec, head;
int error = 0;
git_odb *odb;
size_t i, heads_len;
git_remote_autotag_option_t tagopt = remote->download_tags;
if (opts && opts->download_tags != GIT_REMOTE_DOWNLOAD_TAGS_UNSPECIFIED)
tagopt = opts->download_tags;
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__dispose(&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, tagopt)) < 0)
break;
}
cleanup:
git_refspec__dispose(&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, const git_fetch_options *opts)
{
git_transport *t = remote->transport;
remote->need_pack = 0;
if (filter_wants(remote, opts) < 0) {
git_error_set(GIT_ERROR_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, const git_remote_callbacks *callbacks)
{
git_transport *t = remote->transport;
git_transfer_progress_cb progress = NULL;
void *payload = NULL;
if (!remote->need_pack)
return 0;
if (callbacks) {
progress = callbacks->transfer_progress;
payload = callbacks->payload;
}
return t->download_pack(t, remote->repo, &remote->stats, progress, payload);
}
int git_fetch_init_options(git_fetch_options *opts, unsigned int version)
{
GIT_INIT_STRUCTURE_FROM_TEMPLATE(
opts, version, git_fetch_options, GIT_FETCH_OPTIONS_INIT);
return 0;
}
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