$ git clone -n https://src.fedoraproject.org/rpms/heffte.git /var/lib/mock/f42-build-3350079-45010/root/chroot_tmpdir/scmroot/heffte
Cloning into '/var/lib/mock/f42-build-3350079-45010/root/chroot_tmpdir/scmroot/heffte'...
$ git fetch origin f835547c2054e6489b156df9dad017fb696dbf85:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/heffte
 * [new ref]         f835547c2054e6489b156df9dad017fb696dbf85 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f835547 Add missing fftw-devel dep for devel pkg