$ git clone -n https://src.fedoraproject.org/rpms/google-cpu_features.git /var/lib/mock/f45-build-12863-444/root/chroot_tmpdir/scmroot/google-cpu_features
Cloning into '/var/lib/mock/f45-build-12863-444/root/chroot_tmpdir/scmroot/google-cpu_features'...
$ git fetch origin 01e934a96bf80c87b13f2fae64f3b2cb10d3ea5a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/google-cpu_features
 * [new ref]         01e934a96bf80c87b13f2fae64f3b2cb10d3ea5a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 01e934a Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild