$ git clone -n https://gitee.com/wency_cn/nss-altfiles.git /var/lib/mock/dist-an23-build-491110-74530/root/chroot_tmpdir/scmroot/nss-altfiles
Cloning into '/var/lib/mock/dist-an23-build-491110-74530/root/chroot_tmpdir/scmroot/nss-altfiles'...
$ git fetch origin 4ecc525e901b1852a0e1fb4d9c8bc6c61abeeb0a:KOJI_FETCH_HEAD
From https://gitee.com/wency_cn/nss-altfiles
 * [new ref]         4ecc525e901b1852a0e1fb4d9c8bc6c61abeeb0a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4ecc525 Update code from upstream