$ git clone -n https://src.fedoraproject.org/rpms/buildbox.git /var/lib/mock/f41-build-837671-159310/root/chroot_tmpdir/scmroot/buildbox
Cloning into '/var/lib/mock/f41-build-837671-159310/root/chroot_tmpdir/scmroot/buildbox'...
$ git fetch origin 0a52143170a3c25eccf56f44beb1b395ee47033f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/buildbox
 * [new ref]         0a52143170a3c25eccf56f44beb1b395ee47033f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0a52143 Disable i686 build