$ git clone -n https://src.fedoraproject.org/rpms/ghc-shakespeare.git /var/lib/mock/f39-build-2515516-61728/root/chroot_tmpdir/scmroot/ghc-shakespeare
Cloning into '/var/lib/mock/f39-build-2515516-61728/root/chroot_tmpdir/scmroot/ghc-shakespeare'...
$ git fetch origin 003d0333a84cf8a9125af7e80411cec0f60dc7c5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-shakespeare
 * [new ref]         003d0333a84cf8a9125af7e80411cec0f60dc7c5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 003d033 https://hackage.haskell.org/package/shakespeare-2.1.0/changelog