$ git clone -n https://src.fedoraproject.org/rpms/ghc-shakespeare.git /var/lib/mock/f41-build-side-1-2883190-34500/root/chroot_tmpdir/scmroot/ghc-shakespeare
Cloning into '/var/lib/mock/f41-build-side-1-2883190-34500/root/chroot_tmpdir/scmroot/ghc-shakespeare'...
$ git fetch origin 37b41fe66018c373991b6acd1d84a7a177934c82:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-shakespeare
 * [new ref]         37b41fe66018c373991b6acd1d84a7a177934c82 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 37b41fe https://hackage.haskell.org/package/shakespeare-2.1.0.1/changelog