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420 lines (333 loc) · 9.74 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"
#include "repository.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;
int error;
/* TODO: Should we guard against references
* which name doesn't start with refs/heads/ ?
*/
error = git_reference_name_to_id(&oid, head_info->repo, reference_name);
if (error == GIT_ENOTFOUND) {
/* If the reference doesn't exists, it obviously cannot match the
* expected oid. */
giterr_clear();
return 0;
}
if (!error && !git_oid__cmp(&head_info->remote_head_oid, &oid)) {
/* Determine the local reference name from the remote tracking one */
error = git_refspec_transform_l(
&head_info->branchname, head_info->refspec, reference_name);
if (!error &&
git_buf_len(&head_info->branchname) > 0 &&
!(error = git_buf_sets(
&head_info->branchname,
git_buf_cstr(&head_info->branchname) +
strlen(GIT_REFS_HEADS_DIR))))
{
head_info->found = true;
error = GIT_ITEROVER;
}
}
return error;
}
static int update_head_to_new_branch(
git_repository *repo,
const git_oid *target,
const char *name)
{
git_reference *tracking_branch = NULL;
int error = create_tracking_branch(&tracking_branch, repo, target, name);
if (!error)
error = git_repository_set_head(
repo, git_reference_name(tracking_branch));
git_reference_free(tracking_branch);
return error;
}
static int update_head_to_remote(git_repository *repo, git_remote *remote)
{
int error = 0;
size_t refs_len;
git_refspec dummy_spec;
const git_remote_head *remote_head, **refs;
struct head_info head_info;
git_buf remote_master_name = GIT_BUF_INIT;
if ((error = git_remote_ls(&refs, &refs_len, remote)) < 0)
return error;
/* Did we just clone an empty repository? */
if (refs_len == 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 the list. */
remote_head = refs[0];
assert(remote_head);
memset(&head_info, 0, sizeof(head_info));
git_oid_cpy(&head_info.remote_head_oid, &remote_head->oid);
head_info.repo = repo;
head_info.refspec =
git_remote__matching_refspec(remote, GIT_REFS_HEADS_MASTER_FILE);
if (head_info.refspec == NULL) {
memset(&dummy_spec, 0, sizeof(git_refspec));
head_info.refspec = &dummy_spec;
}
/* Determine the remote tracking reference name from the local master */
if ((error = git_refspec_transform_r(
&remote_master_name,
head_info.refspec,
GIT_REFS_HEADS_MASTER_FILE)) < 0)
return error;
/* Check to see if the remote HEAD points to the remote master */
error = reference_matches_remote_head(
git_buf_cstr(&remote_master_name), &head_info);
if (error < 0 && error != GIT_ITEROVER)
goto cleanup;
if (head_info.found) {
error = 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. */
error = git_reference_foreach_name(
repo, reference_matches_remote_head, &head_info);
if (error < 0 && error != GIT_ITEROVER)
goto cleanup;
if (head_info.found) {
error = update_head_to_new_branch(
repo,
&head_info.remote_head_oid,
git_buf_cstr(&head_info.branchname));
} else {
error = git_repository_set_head_detached(
repo, &head_info.remote_head_oid);
}
cleanup:
git_buf_free(&remote_master_name);
git_buf_free(&head_info.branchname);
return error;
}
static int update_head_to_branch(
git_repository *repo,
const char *remote_name,
const char *branch)
{
int retcode;
git_buf remote_branch_name = GIT_BUF_INIT;
git_reference* remote_ref = NULL;
assert(remote_name && branch);
if ((retcode = git_buf_printf(&remote_branch_name, GIT_REFS_REMOTES_DIR "%s/%s",
remote_name, 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), 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;
const char *name;
name = options->remote_name ? options->remote_name : "origin";
if ((error = git_remote_create(&origin, repo, name, url)) < 0)
goto on_error;
if (options->ignore_cert_errors)
git_remote_check_cert(origin, 0);
if ((error = git_remote_set_callbacks(origin, &options->remote_callbacks)) < 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 bool should_checkout(
git_repository *repo,
bool is_bare,
const 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_unborn(repo);
}
int git_clone_into(git_repository *repo, git_remote *remote, const git_checkout_opts *co_opts, const char *branch)
{
int error = 0, old_fetchhead;
git_strarray refspecs;
assert(repo && remote);
if (!git_repository_is_empty(repo)) {
giterr_set(GITERR_INVALID, "the repository is not empty");
return -1;
}
if ((error = git_remote_get_fetch_refspecs(&refspecs, remote)) < 0)
return error;
if ((error = git_remote_add_fetch(remote, "refs/tags/*:refs/tags/*")) < 0)
return error;
old_fetchhead = git_remote_update_fetchhead(remote);
git_remote_set_update_fetchhead(remote, 0);
if ((error = git_remote_fetch(remote)) != 0)
goto cleanup;
if (branch)
error = update_head_to_branch(repo, git_remote_name(remote), branch);
/* Point HEAD to the same ref as the remote's head */
else
error = update_head_to_remote(repo, remote);
if (!error && should_checkout(repo, git_repository_is_bare(repo), co_opts))
error = git_checkout_head(repo, co_opts);
cleanup:
git_remote_set_update_fetchhead(remote, old_fetchhead);
/* Go back to the original refspecs */
{
int error_alt = git_remote_set_fetch_refspecs(remote, &refspecs);
if (!error)
error = error_alt;
}
git_strarray_free(&refspecs);
return error;
}
int git_clone(
git_repository **out,
const char *url,
const char *local_path,
const git_clone_options *_options)
{
int error = 0;
git_repository *repo = NULL;
git_remote *origin;
git_clone_options options = GIT_CLONE_OPTIONS_INIT;
uint32_t rmdir_flags = GIT_RMDIR_REMOVE_FILES;
assert(out && url && local_path);
if (_options)
memcpy(&options, _options, sizeof(git_clone_options));
GITERR_CHECK_VERSION(&options, GIT_CLONE_OPTIONS_VERSION, "git_clone_options");
/* Only clone to a new directory or an empty directory */
if (git_path_exists(local_path) && !git_path_is_empty_dir(local_path)) {
giterr_set(GITERR_INVALID,
"'%s' exists and is not an empty directory", local_path);
return GIT_EEXISTS;
}
/* Only remove the root directory on failure if we create it */
if (git_path_exists(local_path))
rmdir_flags |= GIT_RMDIR_SKIP_ROOT;
if ((error = git_repository_init(&repo, local_path, options.bare)) < 0)
return error;
if (!(error = create_and_configure_origin(&origin, repo, url, &options))) {
error = git_clone_into(
repo, origin, &options.checkout_opts, options.checkout_branch);
git_remote_free(origin);
}
if (error != 0) {
git_repository_free(repo);
repo = NULL;
(void)git_futils_rmdir_r(local_path, NULL, rmdir_flags);
}
*out = repo;
return error;
}
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