如何切换到指定版本

How to switch to specified version

本文关键字：版本 何切换      更新时间：2023-10-16

我想将克隆的存储库切换到某个指定的版本。当我运行此代码时，它无法按我想要的方式工作。它意识到我落后于或高于主的提交次数，但它并没有真正切换项目。

例如，如果我有包含一些 txt 文档的 1.0 版，以及不包含此 txt 文档的 1.1 版。Master 指向 1.1 版

首先，我克隆整个存储库(目标文件夹不包含 txt 文档)。

然后我执行此代码，我希望 txt 文档出现在目标文件夹中。

当我尝试这个时：

使用 Git 下载特定标签

它的工作，我希望我的代码也这样做，

git_libgit2_init();
const char * REPO_PATH = path.c_str();
git_repository * repo = nullptr;
git_repository_open(&repo, REPO_PATH);
git_reference *ref;
git_reference_lookup(&ref, repo, "refs/heads/master");      // "refs/remotes/origin/HEAD"
git_reference *new_ref;
git_reference_lookup(&new_ref, repo, tag.c_str());
git_revwalk *walker;
git_revwalk_new(&walker, repo);
git_revwalk_push_ref(walker, tag.c_str());
git_oid id;
git_revwalk_next(&id, walker);
git_reference_set_target(&new_ref, ref, &id, NULL);
if (0 != git_repository_set_head_detached(repo, &id)) cerr << "problem occured while detaching head" << endl;
git_revwalk_free(walker);
git_repository_free(repo);
git_libgit2_shutdown();

我也尝试过这样的事情，但这在 git_annotated_commit_from_ref() 处失败了

这是我的第二个实现：

git_libgit2_init();
const char * REPO_PATH = path.c_str();
git_repository * repo = nullptr;
git_repository_open(&repo, REPO_PATH);
git_reference *ref;
git_reference_lookup(&ref, repo, tag.c_str());
git_annotated_commit *out;
if (0 != git_annotated_commit_from_ref(&out,repo,ref)) cerr << "error creating annotated commit" << endl;
if (0 != git_repository_set_head_detached_from_annotated(repo, out)) cerr << "problem occured while detaching head" << endl;
git_repository_free(repo);
git_libgit2_shutdown();

我明白了

设置结帐策略以GIT_CHECKOUT_FORCE需要

git_libgit2_init();
const char * REPO_PATH = path.c_str();
git_repository * repo = nullptr;
git_repository_open(&repo, REPO_PATH);
git_reference *ref;
git_reference_lookup(&ref, repo, "refs/heads/master");      
git_reference *new_ref;
git_reference_lookup(&new_ref, repo, tag.c_str());
git_revwalk *walker;
git_revwalk_new(&walker, repo);
git_revwalk_push_ref(walker, tag.c_str());
git_oid id;
git_revwalk_next(&id, walker);
git_reference_set_target(&new_ref, ref, &id,NULL);
if (0 != git_repository_set_head_detached(repo, &id)) cerr << "problem occured while detaching head" << endl;

git_checkout_options opts = GIT_CHECKOUT_OPTIONS_INIT;
opts.checkout_strategy = GIT_CHECKOUT_FORCE;
if (0 != git_checkout_head(repo, &opts)) cout << "problem checkout head" << endl;
git_revwalk_free(walker);
git_repository_free(repo);
git_libgit2_shutdown();

void checkout_progress(
const char *path,
size_t cur,
size_t tot,
void *payload)
{
printf("Checking out: %s    %d/%d n",
path, (int)cur, (int)tot);
}
std::string path = "/some/repo/dir";
std::string sha = "a9e1e91f";
git_repository *repo = NULL;
err = git_repository_open(&repo, path.c_str());
git_checkout_options checkout_opts = GIT_CHECKOUT_OPTIONS_INIT;
checkout_opts.checkout_strategy = GIT_CHECKOUT_FORCE ;
checkout_opts.progress_cb = checkout_progress;
git_object * treeish = NULL;
auto git_path = std::string("refs/heads/master/").append(sha);
err = git_revparse_single(&treeish, repo,sha.c_str());
err = git_repository_set_head(repo, git_path.c_str());
err = git_checkout_tree(repo, treeish, &checkout_opts);
git_object_free(treeish);
git_repository_free(repo);
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