$ git clone -n https://src.fedoraproject.org/rpms/ghc-singleton-bool.git /var/lib/mock/f41-build-838915-159871/root/chroot_tmpdir/scmroot/ghc-singleton-bool
Cloning into '/var/lib/mock/f41-build-838915-159871/root/chroot_tmpdir/scmroot/ghc-singleton-bool'...
$ git fetch origin 4c50596f05c7691fe99be20cfa4c4c8e5a630646:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-singleton-bool
 * [new ref]         4c50596f05c7691fe99be20cfa4c4c8e5a630646 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4c50596 update to 0.1.8