$ git clone -n https://src.fedoraproject.org/rpms/sleef.git /var/lib/mock/f42-build-3384173-45084/root/chroot_tmpdir/scmroot/sleef
Cloning into '/var/lib/mock/f42-build-3384173-45084/root/chroot_tmpdir/scmroot/sleef'...
$ git fetch origin 8104d17ba54a903b9905f072e2e5e44ba8480205:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/sleef
 * [new ref]         8104d17ba54a903b9905f072e2e5e44ba8480205 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8104d17 Use %{x86_64}/%{arm64} instead of x86_64/aarch64, for generality