$ git clone -n https://src.fedoraproject.org/rpms/tuxmath.git /var/lib/mock/f40-build-792383-138334/root/chroot_tmpdir/scmroot/tuxmath
Cloning into '/var/lib/mock/f40-build-792383-138334/root/chroot_tmpdir/scmroot/tuxmath'...
$ git fetch origin 3d4771be7f17513c6b181f287608026a3b405556:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/tuxmath
 * [new ref]         3d4771be7f17513c6b181f287608026a3b405556 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3d4771b Patch for stricter flags