$ git clone -n https://src.fedoraproject.org/rpms/transactional-update.git /var/lib/mock/f41-build-side-1-2778902-32448/root/chroot_tmpdir/scmroot/transactional-update
Cloning into '/var/lib/mock/f41-build-side-1-2778902-32448/root/chroot_tmpdir/scmroot/transactional-update'...
$ git fetch origin 8dd18d86f99db31ebf22bac7f22d22d5ea49d098:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/transactional-update
 * [new ref]         8dd18d86f99db31ebf22bac7f22d22d5ea49d098 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8dd18d8 convert GPLv2+ license to SPDX