$ git clone -n https://src.fedoraproject.org/rpms/dl-fedora.git /var/lib/mock/f41-build-side-1-3049434-37886/root/chroot_tmpdir/scmroot/dl-fedora
Cloning into '/var/lib/mock/f41-build-side-1-3049434-37886/root/chroot_tmpdir/scmroot/dl-fedora'...
$ git fetch origin 66d434f039b4cd7600baf69bbf26e23e064ceb0a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/dl-fedora
 * [new ref]         66d434f039b4cd7600baf69bbf26e23e064ceb0a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 66d434f https://hackage.haskell.org/package/dl-fedora-1.2.1/changelog