$ git clone -n https://src.fedoraproject.org/rpms/rust-cpufeatures.git /var/lib/mock/f45-build-41003-778/root/chroot_tmpdir/scmroot/rust-cpufeatures
Cloning into '/var/lib/mock/f45-build-41003-778/root/chroot_tmpdir/scmroot/rust-cpufeatures'...
$ git fetch origin 906a475fe489aaf29ef96323d0f9d920159a6e05:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-cpufeatures
 * [new ref]         906a475fe489aaf29ef96323d0f9d920159a6e05 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 906a475 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild