$ git clone -n https://src.fedoraproject.org/rpms/fros.git /var/lib/mock/f41-build-side-2-python-2681099-29819/root/chroot_tmpdir/scmroot/fros
Cloning into '/var/lib/mock/f41-build-side-2-python-2681099-29819/root/chroot_tmpdir/scmroot/fros'...
$ git fetch origin 90ff1c990343fa01291a270fab1fe441b1ce4d58:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/fros
 * [new ref]         90ff1c990343fa01291a270fab1fe441b1ce4d58 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 90ff1c9 convert GPLv2+ license to SPDX