$ git clone -n https://src.fedoraproject.org/rpms/ghc-data-hash.git /var/lib/mock/f41-build-837483-159153/root/chroot_tmpdir/scmroot/ghc-data-hash
Cloning into '/var/lib/mock/f41-build-837483-159153/root/chroot_tmpdir/scmroot/ghc-data-hash'...
$ git fetch origin a893bdf3619cdcc0afe81f2a3a8ecfddf20af42f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-data-hash
 * [new ref]         a893bdf3619cdcc0afe81f2a3a8ecfddf20af42f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a893bdf bump release