$ git clone -n https://src.fedoraproject.org/rpms/fedora-rpm-macros.git /var/lib/mock/f40-build-1996306-44002/root/chroot_tmpdir/scmroot/fedora-rpm-macros
Cloning into '/var/lib/mock/f40-build-1996306-44002/root/chroot_tmpdir/scmroot/fedora-rpm-macros'...
$ git fetch origin 34f926a4e45c9ba88d25041eb8dc7763e334c797:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/fedora-rpm-macros
 * [new ref]         34f926a4e45c9ba88d25041eb8dc7763e334c797 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 34f926a Migrate to SPDX license