$ git clone -n https://src.fedoraproject.org/rpms/fossil.git /var/lib/mock/f41-build-side-1-2786505-32612/root/chroot_tmpdir/scmroot/fossil
Cloning into '/var/lib/mock/f41-build-side-1-2786505-32612/root/chroot_tmpdir/scmroot/fossil'...
$ git fetch origin 6f89b582fa4d01c5c14d7dda97a7a5838525df58:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/fossil
 * [new ref]         6f89b582fa4d01c5c14d7dda97a7a5838525df58 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6f89b58 convert license to SPDX