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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 "pack.h"
#include "fetch.h"
#include "netops.h"
struct filter_payload {
git_remote *remote;
const git_refspec *spec;
git_odb *odb;
int found_head;
};
static int filter_ref__cb(git_remote_head *head, void *payload)
{
struct filter_payload *p = payload;
int error;
if (!p->found_head && strcmp(head->name, GIT_HEAD_FILE) == 0) {
p->found_head = 1;
} else {
/* If it doesn't match the refpec, we don't want it */
error = git_refspec_src_match(p->spec, head->name);
if (error == GIT_ENOMATCH)
return GIT_SUCCESS;
if (error < GIT_SUCCESS)
return git__rethrow(error, "Error matching remote ref name");
}
/* 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)
{
int error;
struct filter_payload p;
git_vector_clear(&remote->refs);
/*
* 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.spec = git_remote_fetchspec(remote);
p.found_head = 0;
p.remote = remote;
error = git_repository_odb__weakptr(&p.odb, remote->repo);
if (error < GIT_SUCCESS)
return error;
return remote->transport->ls(remote->transport, &filter_ref__cb, &p);
}
/*
* 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.length == 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);
}
/* Receiving data from a socket and storing it is pretty much the same for git and HTTP */
int git_fetch__download_pack(char **out, const char *buffered, size_t buffered_size,
GIT_SOCKET fd, git_repository *repo)
{
git_filebuf file = GIT_FILEBUF_INIT;
int error;
char buff[1024], path[GIT_PATH_MAX];
static const char suff[] = "/objects/pack/pack-received";
gitno_buffer buf;
git_path_join(path, repo->path_repository, suff);
gitno_buffer_setup(&buf, buff, sizeof(buff), fd);
if (memcmp(buffered, "PACK", strlen("PACK"))) {
return git__throw(GIT_ERROR, "The pack doesn't start with the signature");
}
error = git_filebuf_open(&file, path, GIT_FILEBUF_TEMPORARY);
if (error < GIT_SUCCESS)
goto cleanup;
/* Part of the packfile has been received, don't loose it */
error = git_filebuf_write(&file, buffered, buffered_size);
if (error < GIT_SUCCESS)
goto cleanup;
while (1) {
error = git_filebuf_write(&file, buf.data, buf.offset);
if (error < GIT_SUCCESS)
goto cleanup;
gitno_consume_n(&buf, buf.offset);
error = gitno_recv(&buf);
if (error < GIT_SUCCESS)
goto cleanup;
if (error == 0) /* Orderly shutdown */
break;
}
*out = git__strdup(file.path_lock);
if (*out == NULL) {
error = GIT_ENOMEM;
goto cleanup;
}
/* A bit dodgy, but we need to keep the pack at the temporary path */
error = git_filebuf_commit_at(&file, file.path_lock, GIT_PACK_FILE_MODE);
cleanup:
if (error < GIT_SUCCESS)
git_filebuf_cleanup(&file);
return error;
}
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