$ git clone -n https://src.fedoraproject.org/rpms/rust-num-conv.git /var/lib/mock/f45-build-43487-803/root/chroot_tmpdir/scmroot/rust-num-conv
Cloning into '/var/lib/mock/f45-build-43487-803/root/chroot_tmpdir/scmroot/rust-num-conv'...
$ git fetch origin 66c571c85507768e4fcf0282cac0911d46b8ac9e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-num-conv
 * [new ref]         66c571c85507768e4fcf0282cac0911d46b8ac9e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 66c571c Update to version 0.2.2; Resolves RHBZ#2451092