$ git clone -n https://src.fedoraproject.org/rpms/rust-pyo3.git /var/lib/mock/f40-build-2702313-70612/root/chroot_tmpdir/scmroot/rust-pyo3
Cloning into '/var/lib/mock/f40-build-2702313-70612/root/chroot_tmpdir/scmroot/rust-pyo3'...
$ git fetch origin 03904caab119689524011e14938e33c2f9c27237:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-pyo3
 * [new ref]         03904caab119689524011e14938e33c2f9c27237 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 03904ca Drop deny(warnings) from doctests to fix building with recent Rust