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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"
#include "odb.h"
static int clone_local_into(git_repository *repo, git_remote *remote, const git_fetch_options *fetch_opts, const git_checkout_options *co_opts, const char *branch, int link);
static int create_branch(
git_reference **branch,
git_repository *repo,
const git_oid *target,
const char *name,
const char *log_message)
{
git_commit *head_obj = NULL;
git_reference *branch_ref = NULL;
git_buf refname = GIT_BUF_INIT;
int error;
/* Find the target commit */
if ((error = git_commit_lookup(&head_obj, repo, target)) < 0)
return error;
/* Create the new branch */
if ((error = git_buf_printf(&refname, GIT_REFS_HEADS_DIR "%s", name)) < 0)
return error;
error = git_reference_create(&branch_ref, repo, git_buf_cstr(&refname), target, 0, log_message);
git_buf_free(&refname);
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,
const char *log_message)
{
int error;
if ((error = create_branch(branch, repo, target, branch_name, log_message)) < 0)
return error;
return setup_tracking_config(
repo,
branch_name,
GIT_REMOTE_ORIGIN,
git_reference_name(*branch));
}
static int update_head_to_new_branch(
git_repository *repo,
const git_oid *target,
const char *name,
const char *reflog_message)
{
git_reference *tracking_branch = NULL;
int error;
if (!git__prefixcmp(name, GIT_REFS_HEADS_DIR))
name += strlen(GIT_REFS_HEADS_DIR);
error = create_tracking_branch(&tracking_branch, repo, target, name,
reflog_message);
if (!error)
error = git_repository_set_head(
repo, git_reference_name(tracking_branch));
git_reference_free(tracking_branch);
/* if it already existed, then the user's refspec created it for us, ignore it' */
if (error == GIT_EEXISTS)
error = 0;
return error;
}
static int update_head_to_remote(
git_repository *repo,
git_remote *remote,
const char *reflog_message)
{
int error = 0;
size_t refs_len;
git_refspec *refspec;
const git_remote_head *remote_head, **refs;
const git_oid *remote_head_id;
git_buf remote_master_name = GIT_BUF_INIT;
git_buf branch = GIT_BUF_INIT;
if ((error = git_remote_ls(&refs, &refs_len, remote)) < 0)
return error;
/* We cloned an empty repository or one with an unborn HEAD */
if (refs_len == 0 || strcmp(refs[0]->name, GIT_HEAD_FILE))
return setup_tracking_config(
repo, "master", GIT_REMOTE_ORIGIN, GIT_REFS_HEADS_MASTER_FILE);
/* We know we have HEAD, let's see where it points */
remote_head = refs[0];
assert(remote_head);
remote_head_id = &remote_head->oid;
error = git_remote_default_branch(&branch, remote);
if (error == GIT_ENOTFOUND) {
error = git_repository_set_head_detached(
repo, remote_head_id);
goto cleanup;
}
refspec = git_remote__matching_refspec(remote, git_buf_cstr(&branch));
if (refspec == NULL) {
giterr_set(GITERR_NET, "the remote's default branch does not fit the refspec configuration");
error = GIT_EINVALIDSPEC;
goto cleanup;
}
/* Determine the remote tracking reference name from the local master */
if ((error = git_refspec_transform(
&remote_master_name,
refspec,
git_buf_cstr(&branch))) < 0)
goto cleanup;
error = update_head_to_new_branch(
repo,
remote_head_id,
git_buf_cstr(&branch),
reflog_message);
cleanup:
git_buf_free(&remote_master_name);
git_buf_free(&branch);
return error;
}
static int update_head_to_branch(
git_repository *repo,
const char *remote_name,
const char *branch,
const char *reflog_message)
{
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,
reflog_message);
cleanup:
git_reference_free(remote_ref);
git_buf_free(&remote_branch_name);
return retcode;
}
static int default_repository_create(git_repository **out, const char *path, int bare, void *payload)
{
GIT_UNUSED(payload);
return git_repository_init(out, path, bare);
}
static int default_remote_create(
git_remote **out,
git_repository *repo,
const char *name,
const char *url,
void *payload)
{
GIT_UNUSED(payload);
return git_remote_create(out, repo, name, url);
}
/*
* 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;
char buf[GIT_PATH_MAX];
git_remote_create_cb remote_create = options->remote_cb;
void *payload = options->remote_cb_payload;
/* If the path exists and is a dir, the url should be the absolute path */
if (git_path_root(url) < 0 && git_path_exists(url) && git_path_isdir(url)) {
if (p_realpath(url, buf) == NULL)
return -1;
url = buf;
}
if (!remote_create) {
remote_create = default_remote_create;
payload = NULL;
}
if ((error = remote_create(&origin, repo, "origin", url, payload)) < 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_options *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);
}
static int checkout_branch(git_repository *repo, git_remote *remote, const git_checkout_options *co_opts, const char *branch, const char *reflog_message)
{
int error;
if (branch)
error = update_head_to_branch(repo, git_remote_name(remote), branch,
reflog_message);
/* Point HEAD to the same ref as the remote's head */
else
error = update_head_to_remote(repo, remote, reflog_message);
if (!error && should_checkout(repo, git_repository_is_bare(repo), co_opts))
error = git_checkout_head(repo, co_opts);
return error;
}
static int clone_into(git_repository *repo, git_remote *_remote, const git_fetch_options *opts, const git_checkout_options *co_opts, const char *branch)
{
int error;
git_buf reflog_message = GIT_BUF_INIT;
git_fetch_options fetch_opts;
git_remote *remote;
assert(repo && _remote);
if (!git_repository_is_empty(repo)) {
giterr_set(GITERR_INVALID, "the repository is not empty");
return -1;
}
if ((error = git_remote_dup(&remote, _remote)) < 0)
return error;
memcpy(&fetch_opts, opts, sizeof(git_fetch_options));
fetch_opts.update_fetchhead = 0;
fetch_opts.download_tags = GIT_REMOTE_DOWNLOAD_TAGS_ALL;
git_buf_printf(&reflog_message, "clone: from %s", git_remote_url(remote));
if ((error = git_remote_fetch(remote, NULL, &fetch_opts, git_buf_cstr(&reflog_message))) != 0)
goto cleanup;
error = checkout_branch(repo, remote, co_opts, branch, git_buf_cstr(&reflog_message));
cleanup:
git_remote_free(remote);
git_buf_free(&reflog_message);
return error;
}
int git_clone__should_clone_local(const char *url_or_path, git_clone_local_t local)
{
git_buf fromurl = GIT_BUF_INIT;
const char *path = url_or_path;
bool is_url, is_local;
if (local == GIT_CLONE_NO_LOCAL)
return 0;
if ((is_url = git_path_is_local_file_url(url_or_path)) != 0) {
if (git_path_fromurl(&fromurl, url_or_path) < 0) {
is_local = -1;
goto done;
}
path = fromurl.ptr;
}
is_local = (!is_url || local != GIT_CLONE_LOCAL_AUTO) &&
git_path_isdir(path);
done:
git_buf_free(&fromurl);
return is_local;
}
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;
git_repository_create_cb repository_cb;
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 (options.repository_cb)
repository_cb = options.repository_cb;
else
repository_cb = default_repository_create;
if ((error = repository_cb(&repo, local_path, options.bare, options.repository_cb_payload)) < 0)
return error;
if (!(error = create_and_configure_origin(&origin, repo, url, &options))) {
int clone_local = git_clone__should_clone_local(url, options.local);
int link = options.local != GIT_CLONE_LOCAL_NO_LINKS;
if (clone_local == 1)
error = clone_local_into(
repo, origin, &options.fetch_opts, &options.checkout_opts,
options.checkout_branch, link);
else if (clone_local == 0)
error = clone_into(
repo, origin, &options.fetch_opts, &options.checkout_opts,
options.checkout_branch);
else
error = -1;
git_remote_free(origin);
}
if (error != 0) {
git_error_state last_error = {0};
giterr_state_capture(&last_error, error);
git_repository_free(repo);
repo = NULL;
(void)git_futils_rmdir_r(local_path, NULL, rmdir_flags);
giterr_state_restore(&last_error);
}
*out = repo;
return error;
}
int git_clone_init_options(git_clone_options *opts, unsigned int version)
{
GIT_INIT_STRUCTURE_FROM_TEMPLATE(
opts, version, git_clone_options, GIT_CLONE_OPTIONS_INIT);
return 0;
}
static bool can_link(const char *src, const char *dst, int link)
{
#ifdef GIT_WIN32
GIT_UNUSED(src);
GIT_UNUSED(dst);
GIT_UNUSED(link);
return false;
#else
struct stat st_src, st_dst;
if (!link)
return false;
if (p_stat(src, &st_src) < 0)
return false;
if (p_stat(dst, &st_dst) < 0)
return false;
return st_src.st_dev == st_dst.st_dev;
#endif
}
static int clone_local_into(git_repository *repo, git_remote *remote, const git_fetch_options *fetch_opts, const git_checkout_options *co_opts, const char *branch, int link)
{
int error, flags;
git_repository *src;
git_buf src_odb = GIT_BUF_INIT, dst_odb = GIT_BUF_INIT, src_path = GIT_BUF_INIT;
git_buf reflog_message = GIT_BUF_INIT;
assert(repo && remote);
if (!git_repository_is_empty(repo)) {
giterr_set(GITERR_INVALID, "the repository is not empty");
return -1;
}
/*
* Let's figure out what path we should use for the source
* repo, if it's not rooted, the path should be relative to
* the repository's worktree/gitdir.
*/
if ((error = git_path_from_url_or_path(&src_path, git_remote_url(remote))) < 0)
return error;
/* Copy .git/objects/ from the source to the target */
if ((error = git_repository_open(&src, git_buf_cstr(&src_path))) < 0) {
git_buf_free(&src_path);
return error;
}
if (git_repository_item_path(&src_odb, src, GIT_REPOSITORY_ITEM_OBJECTS) < 0
|| git_repository_item_path(&dst_odb, repo, GIT_REPOSITORY_ITEM_OBJECTS) < 0) {
error = -1;
goto cleanup;
}
flags = 0;
if (can_link(git_repository_path(src), git_repository_path(repo), link))
flags |= GIT_CPDIR_LINK_FILES;
error = git_futils_cp_r(git_buf_cstr(&src_odb), git_buf_cstr(&dst_odb),
flags, GIT_OBJECT_DIR_MODE);
/*
* can_link() doesn't catch all variations, so if we hit an
* error and did want to link, let's try again without trying
* to link.
*/
if (error < 0 && link) {
flags &= ~GIT_CPDIR_LINK_FILES;
error = git_futils_cp_r(git_buf_cstr(&src_odb), git_buf_cstr(&dst_odb),
flags, GIT_OBJECT_DIR_MODE);
}
if (error < 0)
goto cleanup;
git_buf_printf(&reflog_message, "clone: from %s", git_remote_url(remote));
if ((error = git_remote_fetch(remote, NULL, fetch_opts, git_buf_cstr(&reflog_message))) != 0)
goto cleanup;
error = checkout_branch(repo, remote, co_opts, branch, git_buf_cstr(&reflog_message));
cleanup:
git_buf_free(&reflog_message);
git_buf_free(&src_path);
git_buf_free(&src_odb);
git_buf_free(&dst_odb);
git_repository_free(src);
return error;
}
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