$ git clone -n https://gitee.com/fundawang/libgit2.git /var/lib/mock/dist-an23-build-286404-64832/root/chroot_tmpdir/scmroot/libgit2
Cloning into '/var/lib/mock/dist-an23-build-286404-64832/root/chroot_tmpdir/scmroot/libgit2'...
$ git fetch origin 566aac7d498986ef7269b3c93d8a8528b83ef522:KOJI_FETCH_HEAD
From https://gitee.com/fundawang/libgit2
 * [new ref]         566aac7d498986ef7269b3c93d8a8528b83ef522 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 566aac7 1.6.4