$ git clone -n https://src.fedoraproject.org/rpms/why3.git /var/lib/mock/f41-build-1037874-18820/root/chroot_tmpdir/scmroot/why3
Cloning into '/var/lib/mock/f41-build-1037874-18820/root/chroot_tmpdir/scmroot/why3'...
$ git fetch origin 356eda9812df2a090b2453d7483e90a1eaa10537:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/why3
 * [new ref]         356eda9812df2a090b2453d7483e90a1eaa10537 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 356eda9 Rebuild for apron 0.9.15