$ git clone -n https://src.fedoraproject.org/rpms/smoldyn.git /var/lib/mock/f41-build-side-1-2771297-32222/root/chroot_tmpdir/scmroot/smoldyn
Cloning into '/var/lib/mock/f41-build-side-1-2771297-32222/root/chroot_tmpdir/scmroot/smoldyn'...
$ git fetch origin 6bceb37929ed82b02155592d9bc4dd5e6700de30:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/smoldyn
 * [new ref]         6bceb37929ed82b02155592d9bc4dd5e6700de30 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6bceb37 convert license to SPDX