$ git clone -n https://src.fedoraproject.org/rpms/python-niaclass.git /var/lib/mock/f40-build-2246506-53818/root/chroot_tmpdir/scmroot/python-niaclass
Cloning into '/var/lib/mock/f40-build-2246506-53818/root/chroot_tmpdir/scmroot/python-niaclass'...
$ git fetch origin c1db731fe03cd39c87bae9504218fdaa6aac1284:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-niaclass
 * [new ref]         c1db731fe03cd39c87bae9504218fdaa6aac1284 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c1db731 Drop a needles BuildRequires on python3-pep517