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466 lines (375 loc) · 10.8 KB
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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 <assert.h>
#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"
static int create_branch(
git_reference **branch,
git_repository *repo,
const git_oid *target,
const char *name)
{
git_commit *head_obj = NULL;
git_reference *branch_ref = NULL;
int error;
/* Find the target commit */
if ((error = git_commit_lookup(&head_obj, repo, target)) < 0)
return error;
/* Create the new branch */
error = git_branch_create(&branch_ref, repo, name, head_obj, 0);
git_commit_free(head_obj);
if (!error)
*branch = branch_ref;
else
git_reference_free(branch_ref);
return error;
}
static int setup_tracking_config(
git_repository *repo,
const char *branch_name,
const char *remote_name,
const char *merge_target)
{
git_config *cfg;
git_buf remote_key = GIT_BUF_INIT, merge_key = GIT_BUF_INIT;
int error = -1;
if (git_repository_config__weakptr(&cfg, repo) < 0)
return -1;
if (git_buf_printf(&remote_key, "branch.%s.remote", branch_name) < 0)
goto cleanup;
if (git_buf_printf(&merge_key, "branch.%s.merge", branch_name) < 0)
goto cleanup;
if (git_config_set_string(cfg, git_buf_cstr(&remote_key), remote_name) < 0)
goto cleanup;
if (git_config_set_string(cfg, git_buf_cstr(&merge_key), merge_target) < 0)
goto cleanup;
error = 0;
cleanup:
git_buf_free(&remote_key);
git_buf_free(&merge_key);
return error;
}
static int create_tracking_branch(
git_reference **branch,
git_repository *repo,
const git_oid *target,
const char *branch_name)
{
int error;
if ((error = create_branch(branch, repo, target, branch_name)) < 0)
return error;
return setup_tracking_config(
repo,
branch_name,
GIT_REMOTE_ORIGIN,
git_reference_name(*branch));
}
struct head_info {
git_repository *repo;
git_oid remote_head_oid;
git_buf branchname;
const git_refspec *refspec;
bool found;
};
static int reference_matches_remote_head(
const char *reference_name,
void *payload)
{
struct head_info *head_info = (struct head_info *)payload;
git_oid oid;
/* TODO: Should we guard against references
* which name doesn't start with refs/heads/ ?
*/
/* Stop looking if we've already found a match */
if (head_info->found)
return 0;
if (git_reference_name_to_id(
&oid,
head_info->repo,
reference_name) < 0) {
/* If the reference doesn't exists, it obviously cannot match the expected oid. */
giterr_clear();
return 0;
}
if (git_oid_cmp(&head_info->remote_head_oid, &oid) == 0) {
/* Determine the local reference name from the remote tracking one */
if (git_refspec_transform_l(
&head_info->branchname,
head_info->refspec,
reference_name) < 0)
return -1;
if (git_buf_len(&head_info->branchname) > 0) {
if (git_buf_sets(
&head_info->branchname,
git_buf_cstr(&head_info->branchname) + strlen(GIT_REFS_HEADS_DIR)) < 0)
return -1;
head_info->found = 1;
}
}
return 0;
}
static int update_head_to_new_branch(
git_repository *repo,
const git_oid *target,
const char *name)
{
git_reference *tracking_branch = NULL;
int error;
if ((error = create_tracking_branch(
&tracking_branch,
repo,
target,
name)) < 0)
return error;
error = git_repository_set_head(repo, git_reference_name(tracking_branch));
git_reference_free(tracking_branch);
return error;
}
static int get_head_callback(git_remote_head *head, void *payload)
{
git_remote_head **destination = (git_remote_head **)payload;
/* Save the first entry, and terminate the enumeration */
*destination = head;
return 1;
}
static int update_head_to_remote(git_repository *repo, git_remote *remote)
{
int retcode = -1;
git_remote_head *remote_head;
struct head_info head_info;
git_buf remote_master_name = GIT_BUF_INIT;
/* Did we just clone an empty repository? */
if (remote->refs.length == 0) {
return setup_tracking_config(
repo,
"master",
GIT_REMOTE_ORIGIN,
GIT_REFS_HEADS_MASTER_FILE);
}
/* Get the remote's HEAD. This is always the first ref in remote->refs. */
remote_head = NULL;
if (!remote->transport->ls(remote->transport, get_head_callback, &remote_head))
return -1;
assert(remote_head);
git_oid_cpy(&head_info.remote_head_oid, &remote_head->oid);
git_buf_init(&head_info.branchname, 16);
head_info.repo = repo;
head_info.refspec = git_remote_fetchspec(remote);
head_info.found = 0;
/* Determine the remote tracking reference name from the local master */
if (git_refspec_transform_r(
&remote_master_name,
head_info.refspec,
GIT_REFS_HEADS_MASTER_FILE) < 0)
return -1;
/* Check to see if the remote HEAD points to the remote master */
if (reference_matches_remote_head(git_buf_cstr(&remote_master_name), &head_info) < 0)
goto cleanup;
if (head_info.found) {
retcode = update_head_to_new_branch(
repo,
&head_info.remote_head_oid,
git_buf_cstr(&head_info.branchname));
goto cleanup;
}
/* Not master. Check all the other refs. */
if (git_reference_foreach(
repo,
GIT_REF_LISTALL,
reference_matches_remote_head,
&head_info) < 0)
goto cleanup;
if (head_info.found) {
retcode = update_head_to_new_branch(
repo,
&head_info.remote_head_oid,
git_buf_cstr(&head_info.branchname));
goto cleanup;
} else {
retcode = git_repository_set_head_detached(
repo,
&head_info.remote_head_oid);
goto cleanup;
}
cleanup:
git_buf_free(&remote_master_name);
git_buf_free(&head_info.branchname);
return retcode;
}
static int update_head_to_branch(
git_repository *repo,
const git_clone_options *options)
{
int retcode;
git_buf remote_branch_name = GIT_BUF_INIT;
git_reference* remote_ref = NULL;
assert(options->checkout_branch);
if ((retcode = git_buf_printf(&remote_branch_name, GIT_REFS_REMOTES_DIR "%s/%s",
options->remote_name, options->checkout_branch)) < 0 )
goto cleanup;
if ((retcode = git_reference_lookup(&remote_ref, repo, git_buf_cstr(&remote_branch_name))) < 0)
goto cleanup;
retcode = update_head_to_new_branch(repo, git_reference_target(remote_ref),
options->checkout_branch);
cleanup:
git_reference_free(remote_ref);
git_buf_free(&remote_branch_name);
return retcode;
}
/*
* submodules?
*/
static int create_and_configure_origin(
git_remote **out,
git_repository *repo,
const char *url,
const git_clone_options *options)
{
int error;
git_remote *origin = NULL;
if ((error = git_remote_create(&origin, repo, options->remote_name, url)) < 0)
goto on_error;
git_remote_set_cred_acquire_cb(origin, options->cred_acquire_cb,
options->cred_acquire_payload);
git_remote_set_autotag(origin, options->remote_autotag);
/*
* Don't write FETCH_HEAD, we'll check out the remote tracking
* branch ourselves based on the server's default.
*/
git_remote_set_update_fetchhead(origin, 0);
if (options->remote_callbacks &&
(error = git_remote_set_callbacks(origin, options->remote_callbacks)) < 0)
goto on_error;
if (options->fetch_spec &&
(error = git_remote_set_fetchspec(origin, options->fetch_spec)) < 0)
goto on_error;
if (options->push_spec &&
(error = git_remote_set_pushspec(origin, options->push_spec)) < 0)
goto on_error;
if (options->pushurl &&
(error = git_remote_set_pushurl(origin, options->pushurl)) < 0)
goto on_error;
if ((error = git_remote_save(origin)) < 0)
goto on_error;
*out = origin;
return 0;
on_error:
git_remote_free(origin);
return error;
}
static int setup_remotes_and_fetch(
git_repository *repo,
const char *url,
const git_clone_options *options)
{
int retcode = GIT_ERROR;
git_remote *origin;
/* Construct an origin remote */
if (!create_and_configure_origin(&origin, repo, url, options)) {
git_remote_set_update_fetchhead(origin, 0);
/* Connect and download everything */
if (!git_remote_connect(origin, GIT_DIRECTION_FETCH)) {
if (!(retcode = git_remote_download(origin, options->fetch_progress_cb,
options->fetch_progress_payload))) {
/* Create "origin/foo" branches for all remote branches */
if (!git_remote_update_tips(origin)) {
/* Point HEAD to the requested branch */
if (options->checkout_branch) {
if (!update_head_to_branch(repo, options))
retcode = 0;
}
/* Point HEAD to the same ref as the remote's head */
else 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 bool should_checkout(
git_repository *repo,
bool is_bare,
git_checkout_opts *opts)
{
if (is_bare)
return false;
if (!opts)
return false;
if (opts->checkout_strategy == GIT_CHECKOUT_NONE)
return false;
return !git_repository_head_orphan(repo);
}
static void normalize_options(git_clone_options *dst, const git_clone_options *src)
{
git_clone_options default_options = GIT_CLONE_OPTIONS_INIT;
if (!src) src = &default_options;
*dst = *src;
/* Provide defaults for null pointers */
if (!dst->remote_name) dst->remote_name = "origin";
if (!dst->remote_autotag) dst->remote_autotag = GIT_REMOTE_DOWNLOAD_TAGS_ALL;
}
int git_clone(
git_repository **out,
const char *url,
const char *local_path,
const git_clone_options *options)
{
int retcode = GIT_ERROR;
git_repository *repo = NULL;
git_clone_options normOptions;
int remove_directory_on_failure = 0;
assert(out && url && local_path);
normalize_options(&normOptions, options);
GITERR_CHECK_VERSION(&normOptions, GIT_CLONE_OPTIONS_VERSION, "git_clone_options");
if (!path_is_okay(local_path)) {
return GIT_ERROR;
}
/* Only remove the directory on failure if we create it */
remove_directory_on_failure = !git_path_exists(local_path);
if (!(retcode = git_repository_init(&repo, local_path, normOptions.bare))) {
if ((retcode = setup_remotes_and_fetch(repo, url, &normOptions)) < 0) {
/* Failed to fetch; clean up */
git_repository_free(repo);
if (remove_directory_on_failure)
git_futils_rmdir_r(local_path, NULL, GIT_RMDIR_REMOVE_FILES);
else
git_futils_cleanupdir_r(local_path);
} else {
*out = repo;
retcode = 0;
}
}
if (!retcode && should_checkout(repo, normOptions.bare, &normOptions.checkout_opts))
retcode = git_checkout_head(*out, &normOptions.checkout_opts);
return retcode;
}
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