$ git clone -n https://gitee.com/fundawang/libgit2.git /var/lib/mock/dist-an23-build-296825-65797/root/chroot_tmpdir/scmroot/libgit2
Cloning into '/var/lib/mock/dist-an23-build-296825-65797/root/chroot_tmpdir/scmroot/libgit2'...
$ git fetch origin b287e0a9d9461224a533c2e35225fab77d0e6337:KOJI_FETCH_HEAD
From https://gitee.com/fundawang/libgit2
 * [new ref]         b287e0a9d9461224a533c2e35225fab77d0e6337 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b287e0a 1.7.1