/*
* Copyright (C) 2009-2012 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 <assert.h>
#ifndef GIT_WIN32
#include <dirent.h>
#endif
#include "git2/clone.h"
#include "git2/remote.h"
#include "git2/revparse.h"
#include "git2/branch.h"
#include "git2/config.h"
#include "git2/checkout.h"
#include "git2/commit.h"
#include "git2/tree.h"
#include "common.h"
#include "remote.h"
#include "fileops.h"
#include "refs.h"
#include "path.h"
GIT_BEGIN_DECL
struct HeadInfo {
git_repository *repo;
git_oid remote_head_oid;
git_buf branchname;
};
static int create_tracking_branch(git_repository *repo, const git_oid *target, const char *name)
{
git_object *head_obj = NULL;
git_reference *branch_ref;
int retcode = GIT_ERROR;
/* Find the target commit */
if (git_object_lookup(&head_obj, repo, target, GIT_OBJ_ANY) < 0)
return GIT_ERROR;
/* Create the new branch */
if (!git_branch_create(&branch_ref, repo, name, head_obj, 0)) {
git_config *cfg;
git_reference_free(branch_ref);
/* Set up tracking */
if (!git_repository_config(&cfg, repo)) {
git_buf remote = GIT_BUF_INIT;
git_buf merge = GIT_BUF_INIT;
git_buf merge_target = GIT_BUF_INIT;
if (!git_buf_printf(&remote, "branch.%s.remote", name) &&
!git_buf_printf(&merge, "branch.%s.merge", name) &&
!git_buf_printf(&merge_target, "refs/heads/%s", name) &&
!git_config_set_string(cfg, git_buf_cstr(&remote), "origin") &&
!git_config_set_string(cfg, git_buf_cstr(&merge), git_buf_cstr(&merge_target))) {
retcode = 0;
}
git_buf_free(&remote);
git_buf_free(&merge);
git_buf_free(&merge_target);
git_config_free(cfg);
}
}
git_object_free(head_obj);
return retcode;
}
static int reference_matches_remote_head(const char *head_name, void *payload)
{
struct HeadInfo *head_info = (struct HeadInfo *)payload;
git_oid oid;
/* Stop looking if we've already found a match */
if (git_buf_len(&head_info->branchname) > 0) return 0;
if (!git_reference_name_to_oid(&oid, head_info->repo, head_name) &&
!git_oid_cmp(&head_info->remote_head_oid, &oid)) {
git_buf_puts(&head_info->branchname,
head_name+strlen("refs/remotes/origin/"));
}
return 0;
}
static int update_head_to_new_branch(git_repository *repo, const git_oid *target, const char *name)
{
int retcode = GIT_ERROR;
if (!create_tracking_branch(repo, target, name)) {
git_reference *head;
if (!git_reference_lookup(&head, repo, GIT_HEAD_FILE)) {
git_buf targetbuf = GIT_BUF_INIT;
if (!git_buf_printf(&targetbuf, "refs/heads/%s", name)) {
retcode = git_reference_set_target(head, git_buf_cstr(&targetbuf));
}
git_buf_free(&targetbuf);
git_reference_free(head);
}
}
return retcode;
}
static int update_head_to_remote(git_repository *repo, git_remote *remote)
{
int retcode = GIT_ERROR;
git_remote_head *remote_head;
git_oid oid;
struct HeadInfo head_info;
/* Get the remote's HEAD. This is always the first ref in remote->refs. */
remote_head = remote->refs.contents[0];
git_oid_cpy(&head_info.remote_head_oid, &remote_head->oid);
git_buf_init(&head_info.branchname, 16);
head_info.repo = repo;
/* Check to see if "master" matches the remote head */
if (!git_reference_name_to_oid(&oid, repo, "refs/remotes/origin/master") &&
!git_oid_cmp(&remote_head->oid, &oid)) {
retcode = update_head_to_new_branch(repo, &oid, "master");
}
/* Not master. Check all the other refs. */
else if (!git_reference_foreach(repo, GIT_REF_LISTALL,
reference_matches_remote_head,
&head_info) &&
git_buf_len(&head_info.branchname) > 0) {
retcode = update_head_to_new_branch(repo, &head_info.remote_head_oid,
git_buf_cstr(&head_info.branchname));
}
git_buf_free(&head_info.branchname);
return retcode;
}
/*
* submodules?
*/
static int setup_remotes_and_fetch(git_repository *repo,
const char *origin_url,
git_indexer_stats *fetch_stats)
{
int retcode = GIT_ERROR;
git_remote *origin = NULL;
git_off_t bytes = 0;
git_indexer_stats dummy_stats;
if (!fetch_stats) fetch_stats = &dummy_stats;
/* Create the "origin" remote */
if (!git_remote_add(&origin, repo, "origin", origin_url)) {
/* Connect and download everything */
if (!git_remote_connect(origin, GIT_DIR_FETCH)) {
if (!git_remote_download(origin, &bytes, fetch_stats)) {
/* Create "origin/foo" branches for all remote branches */
if (!git_remote_update_tips(origin)) {
/* Point HEAD to the same ref as the remote's head */
if (!update_head_to_remote(repo, origin)) {
retcode = 0;
}
}
}
git_remote_disconnect(origin);
}
git_remote_free(origin);
}
return retcode;
}
static bool path_is_okay(const char *path)
{
/* The path must either not exist, or be an empty directory */
if (!git_path_exists(path)) return true;
if (!git_path_is_empty_dir(path)) {
giterr_set(GITERR_INVALID,
"'%s' exists and is not an empty directory", path);
return false;
}
return true;
}
static int clone_internal(git_repository **out,
const char *origin_url,
const char *path,
git_indexer_stats *fetch_stats,
int is_bare)
{
int retcode = GIT_ERROR;
git_repository *repo = NULL;
git_indexer_stats dummy_stats;
if (!fetch_stats) fetch_stats = &dummy_stats;
if (!path_is_okay(path)) {
return GIT_ERROR;
}
if (!(retcode = git_repository_init(&repo, path, is_bare))) {
if ((retcode = setup_remotes_and_fetch(repo, origin_url, fetch_stats)) < 0) {
/* Failed to fetch; clean up */
git_repository_free(repo);
git_futils_rmdir_r(path, GIT_DIRREMOVAL_FILES_AND_DIRS);
} else {
*out = repo;
retcode = 0;
}
}
return retcode;
}
int git_clone_bare(git_repository **out,
const char *origin_url,
const char *dest_path,
git_indexer_stats *fetch_stats)
{
assert(out && origin_url && dest_path);
return clone_internal(out, origin_url, dest_path, fetch_stats, 1);
}
int git_clone(git_repository **out,
const char *origin_url,
const char *workdir_path,
git_indexer_stats *fetch_stats,
git_indexer_stats *checkout_stats,
git_checkout_opts *checkout_opts)
{
int retcode = GIT_ERROR;
assert(out && origin_url && workdir_path);
if (!(retcode = clone_internal(out, origin_url, workdir_path, fetch_stats, 0))) {
retcode = git_checkout_head(*out, checkout_opts, checkout_stats);
}
return retcode;
}
GIT_END_DECL
