$ git clone -n https://src.fedoraproject.org/rpms/why3.git /var/lib/mock/f40-build-1292789-23380/root/chroot_tmpdir/scmroot/why3
Cloning into '/var/lib/mock/f40-build-1292789-23380/root/chroot_tmpdir/scmroot/why3'...
$ git fetch origin 8000f2ad4af141f76026c5822c8ec889dba63864:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/why3
 * [new ref]         8000f2ad4af141f76026c5822c8ec889dba63864 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8000f2a Version 1.7.2