$ git clone -n https://src.fedoraproject.org/rpms/goffice.git /var/lib/mock/f40-build-763388-122475/root/chroot_tmpdir/scmroot/goffice
Cloning into '/var/lib/mock/f40-build-763388-122475/root/chroot_tmpdir/scmroot/goffice'...
$ git fetch origin fcbbd76677ea9b9eee270bc679805ffd9ab4d85f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/goffice
 * [new ref]         fcbbd76677ea9b9eee270bc679805ffd9ab4d85f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fcbbd76 Drop i686 architecture