$ git clone -n https://src.fedoraproject.org/rpms/rust-pyo3_0.15.git /var/lib/mock/f38-build-side-42-init-devel-1394943-31050/root/chroot_tmpdir/scmroot/rust-pyo3_0.15
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1394943-31050/root/chroot_tmpdir/scmroot/rust-pyo3_0.15'...
$ git fetch origin a9e8e73605567f23ab517686d7c84d7db9982a7d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-pyo3_0.15
 * [new ref]         a9e8e73605567f23ab517686d7c84d7db9982a7d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a9e8e73 Allow warnings in doctests to fix tests with Rust 1.70