$ git clone -n https://src.fedoraproject.org/rpms/ghc-chunked-data.git /var/lib/mock/f40-build-2074812-49440/root/chroot_tmpdir/scmroot/ghc-chunked-data
Cloning into '/var/lib/mock/f40-build-2074812-49440/root/chroot_tmpdir/scmroot/ghc-chunked-data'...
$ git fetch origin 37e5c26989fb209cc012df872c27ad56dc608773:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-chunked-data
 * [new ref]         37e5c26989fb209cc012df872c27ad56dc608773 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 37e5c26 bump release