$ git clone -n https://gitee.com/fundawang/libgit2.git /var/lib/mock/dist-an23-build-296839-65797/root/chroot_tmpdir/scmroot/libgit2
Cloning into '/var/lib/mock/dist-an23-build-296839-65797/root/chroot_tmpdir/scmroot/libgit2'...
$ git fetch origin 9bd4f33b78bd2b7b139a5687bd90cef3c99754b0:KOJI_FETCH_HEAD
From https://gitee.com/fundawang/libgit2
 * [new ref]         9bd4f33b78bd2b7b139a5687bd90cef3c99754b0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9bd4f33 1.6.4