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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 "git2/sys/remote.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_refspec *tagspec, git_remote_autotag_option_t tagopt)
{
int match = 0, valid;
if (git_reference_name_is_valid(&valid, head->name) < 0)
return -1;
if (!valid)
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;
return git_vector_insert(&remote->refs, head);
}
static int mark_local(git_remote *remote)
{
git_remote_head *head;
git_odb *odb;
size_t i;
if (git_repository_odb__weakptr(&odb, remote->repo) < 0)
return -1;
git_vector_foreach(&remote->refs, i, head) {
/* 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 0;
}
static int maybe_want_oid(git_remote *remote, git_refspec *spec)
{
git_remote_head *oid_head;
oid_head = git__calloc(1, sizeof(git_remote_head));
GIT_ERROR_CHECK_ALLOC(oid_head);
git_oid_fromstr(&oid_head->oid, spec->src, GIT_OID_SHA1);
if (spec->dst) {
oid_head->name = git__strdup(spec->dst);
GIT_ERROR_CHECK_ALLOC(oid_head->name);
}
if (git_vector_insert(&remote->local_heads, oid_head) < 0 ||
git_vector_insert(&remote->refs, oid_head) < 0)
return -1;
return 0;
}
static int filter_wants(git_remote *remote, const git_fetch_options *opts)
{
git_remote_head **heads;
git_refspec tagspec, head, *spec;
int error = 0;
git_odb *odb;
size_t i, heads_len;
unsigned int remote_caps;
unsigned int oid_mask = GIT_REMOTE_CAPABILITY_TIP_OID |
GIT_REMOTE_CAPABILITY_REACHABLE_OID;
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 ((error = git_repository_odb__weakptr(&odb, remote->repo)) < 0)
goto cleanup;
if ((error = git_remote_ls((const git_remote_head ***)&heads, &heads_len, remote)) < 0 ||
(error = git_remote_capabilities(&remote_caps, remote)) < 0)
goto cleanup;
/* Handle remote heads */
for (i = 0; i < heads_len; i++) {
if ((error = maybe_want(remote, heads[i], &tagspec, tagopt)) < 0)
goto cleanup;
}
/* Handle explicitly specified OID specs */
git_vector_foreach(&remote->active_refspecs, i, spec) {
if (!git_oid__is_hexstr(spec->src, GIT_OID_SHA1))
continue;
if (!(remote_caps & oid_mask)) {
git_error_set(GIT_ERROR_INVALID, "cannot fetch a specific object from the remote repository");
error = -1;
goto cleanup;
}
if ((error = maybe_want_oid(remote, spec)) < 0)
goto cleanup;
}
error = mark_local(remote);
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)
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);
}
int git_fetch_options_init(git_fetch_options *opts, unsigned int version)
{
GIT_INIT_STRUCTURE_FROM_TEMPLATE(
opts, version, git_fetch_options, GIT_FETCH_OPTIONS_INIT);
return 0;
}
#ifndef GIT_DEPRECATE_HARD
int git_fetch_init_options(git_fetch_options *opts, unsigned int version)
{
return git_fetch_options_init(opts, version);
}
#endif
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