$ git clone -n https://src.fedoraproject.org/rpms/rust-nuon.git /var/lib/mock/f41-build-side-1-3007602-36769/root/chroot_tmpdir/scmroot/rust-nuon
Cloning into '/var/lib/mock/f41-build-side-1-3007602-36769/root/chroot_tmpdir/scmroot/rust-nuon'...
$ git fetch origin f5bef197afdda878e1f7a1e95805104934b1eed8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-nuon
 * [new ref]         f5bef197afdda878e1f7a1e95805104934b1eed8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f5bef19 Initial package (rhbz#2302082)