如何将 HEAD 签出到 libgit2 中的指定引用或标签

how to checkout HEAD to specified reference or tag in libgit2?

本文关键字：引用 标签 libgit2 HEAD      更新时间：2023-10-16

我想将我的程序降级到以前的版本。是否可以在libgit2中做到这一点？

有我的代码

string path = "C://Local//Path//to//my//repo";
string tag = "refs/tags/v0.0.4";
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_symbolic_set_target(&new_ref, ref,tag.c_str(),"message");

git_checkout_options opts = GIT_CHECKOUT_OPTIONS_INIT;
// how to specify options to use ref or tag?
git_checkout_head(repo, &opts);
git_repository_free(repo);
git_libgit2_shutdown();

认为我明白了 

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, "message");
     git_checkout_options opts = GIT_CHECKOUT_OPTIONS_INIT;
    if (0!=git_repository_set_head_detached(repo,&id)) cerr<<"problem occured while detaching head"<< endl;
    if (0 != git_checkout_head(repo, &opts)) cerr << "problem checkout head" << endl;
    git_revwalk_free(walker);
    git_repository_free(repo);
    git_libgit2_shutdown();
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