$ git clone -n https://src.fedoraproject.org/rpms/racket.git /var/lib/mock/f40-build-2232420-53333/root/chroot_tmpdir/scmroot/racket
Cloning into '/var/lib/mock/f40-build-2232420-53333/root/chroot_tmpdir/scmroot/racket'...
$ git fetch origin 1af338885878f3d294fd8372f2f69709c89cc44c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/racket
 * [new ref]         1af338885878f3d294fd8372f2f69709c89cc44c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1af3388 re-enable ppc64le for epel