$ git clone -n https://src.fedoraproject.org/rpms/rust-below-config.git /var/lib/mock/f41-build-714919-13069/root/chroot_tmpdir/scmroot/rust-below-config
Cloning into '/var/lib/mock/f41-build-714919-13069/root/chroot_tmpdir/scmroot/rust-below-config'...
$ git fetch origin 18e41f1ac6358e08571f2e59ab342edc6b8e6b73:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-below-config
 * [new ref]         18e41f1ac6358e08571f2e59ab342edc6b8e6b73 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 18e41f1 Update to 0.8.1 (rhbz#2272245)