$ git clone -n https://src.fedoraproject.org/rpms/cdw.git /var/lib/mock/f40-build-1992419-43597/root/chroot_tmpdir/scmroot/cdw
Cloning into '/var/lib/mock/f40-build-1992419-43597/root/chroot_tmpdir/scmroot/cdw'...
$ git fetch origin d2d97dda729d63875864a0ecf734181d29b97ba2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/cdw
 * [new ref]         d2d97dda729d63875864a0ecf734181d29b97ba2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d2d97dd migrate spec to autochangelog