如何在 libgit2 中使用 git_clone() 克隆特定标签

Question

我想从 bitbucket 中的存储库克隆特定标签。现在我可以克隆整个存储库。我应该在代码中添加什么来克隆特定标签？

我看过这个，但它并没有真正帮助我：

https://github.com/libgit2/git2go/issues/126

---

git_libgit2_init();

int 数字 = 0;

git_clone_optionsclone_opts = GIT_CLONE_OPTIONS_INIT;

git_checkout_options checkout_opts = GIT_CHECKOUT_OPTIONS_INIT;

clone_opts.checkout_opts = checkout_opts;

clone_opts.fetch_opts.callbacks.credentials = cred_acquire_cb;

git_repository *cloned_repo = NULL;

int错误 = git_clone(&cloned_repo, all_urls.at(num).c_str(), clone_to.at(num).c_str(), &clone_opts);

如果（错误！= 0）{

const git_error *err = giterr_last();

cerr << "error in clone num " << num << " -> message :" << err->message << endl;

}

否则算了<< endl << "Clone " << num << " succesful" << "(from url : " << all_urls.at(num) << " " << "to path : " << clone_to.at(num) << ")" << endl;

git_repository_free(cloned_repo);

git_libgit2_shutdown();

---

感谢您的宝贵时间

Answer 1

您可能需要创建本地存储库并手动从远程 URL 同步。
“克隆”的方式： git init -> 添加远程 url -> git fetch $refspec -> git checkout

通过使用 libgit2，示例代码如下：

// libgit version v1.7.0 (last release version) 

// INPUT args
string git_address = "https://github.com/<org>/<repo>.git"
string branch, tag;

// start
git_repository *repo = nullptr;
git_remote   *remote = nullptr;

// create a bare local repository
git_repository_init(&repo, "/your/local/path/", false);

// set remote url
git_remote_create(&remote, repo, "origin", git_address.c_str());

// generate refspec
// http://git-scm.com/docs/git-rev-parse.html#_specifying_revisions
std::string refspec;  // for git fetch
std::string revspec;  // for git checkout
if (branch.size()) {
    refspec = "+refs/heads/" + branch + ":refs/remotes/origin/" + branch;
    revspec = "refs/remotes/origin/" + branch;
}
if (tag.size()) {
    refspec = "+refs/tags/" + tag + ":refs/tags/" + tag;
    revspec = "refs/tags/" + tag;
}

// construct fetch_opts and run fetch
// for libgit:v1.7.0 the GIT_FETCH_OPTIONS_INIT was
// missing some field, so we must assign then manually.
char *refspec_addr[] = {refspec.data()};
git_strarray refspecs{refspec_addr, 1};

git_fetch_options fetch_opt = GIT_FETCH_OPTIONS_INIT;
fetch_opt.proxy_opts.type  = GIT_PROXY_AUTO;
fetch_opt.depth            = 1;
fetch_opt.follow_redirects = GIT_REMOTE_REDIRECT_INITIAL;
fetch_opt.custom_headers   = git_strarray{nullptr, 0};
git_remote_fetch(remote, &refspecs, &fetch_opt, NULL);

// find revision
git_object *rev;
git_revparse_single(&rev, repo, revspec.c_str());

// git checkout $branch
// git checkout tags/$tag
git_checkout_options checkout_opts = GIT_CHECKOUT_OPTIONS_INIT;
checkout_opts.checkout_strategy = GIT_CHECKOUT_SAFE;
git_checkout_tree(repo, rev, &checkout_opts);

// finally close
git_remote_free(remote);
git_repository_free(repo);

附注：支持Http代理。 （在您的系统/用户配置 .gitconfig 中）