$ git clone -n https://gitee.com/wenyuzifang/nss-altfiles.git /var/lib/mock/dist-an23-build-469914-74027/root/chroot_tmpdir/scmroot/nss-altfiles
Cloning into '/var/lib/mock/dist-an23-build-469914-74027/root/chroot_tmpdir/scmroot/nss-altfiles'...
$ git fetch origin a42507568792a03b0452a7a584e190618b6bfd76:KOJI_FETCH_HEAD
From https://gitee.com/wenyuzifang/nss-altfiles
 * [new ref]         a42507568792a03b0452a7a584e190618b6bfd76 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a425075 Update code from upstream