$ git clone -n https://src.fedoraproject.org/rpms/racket.git /var/lib/mock/f41-build-846635-163159/root/chroot_tmpdir/scmroot/racket
Cloning into '/var/lib/mock/f41-build-846635-163159/root/chroot_tmpdir/scmroot/racket'...
$ git fetch origin e3083f85c60c3a7710051031da2c834c7caeda69:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/racket
 * [new ref]         e3083f85c60c3a7710051031da2c834c7caeda69 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e3083f8 Update to 8.14 release