$ git clone -n https://src.fedoraproject.org/rpms/rust-below-render.git /var/lib/mock/f42-build-side-1-3505138-45989/root/chroot_tmpdir/scmroot/rust-below-render
Cloning into '/var/lib/mock/f42-build-side-1-3505138-45989/root/chroot_tmpdir/scmroot/rust-below-render'...
$ git fetch origin bae9fda683ac268af0642bcfba1463d94e0f4671:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-below-render
 * [new ref]         bae9fda683ac268af0642bcfba1463d94e0f4671 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bae9fda Update to 0.9.0; Fixes: RHBZ#2347637