emacs: do not change the current env in update-from-overlay.py

            "-A",

            f"emacsPackages.{nix_attr}",

        ]

        environment = os.environ

        environment["NIXPKGS_ALLOW_BROKEN"] = "1"

        env = os.environ.copy()

        env["NIXPKGS_ALLOW_BROKEN"] = "1"

        logging.info(f"Testing {nix_attr}")

        # TODO: capture the output (to put it in the logfile).

        result = subprocess.run(cmdline, capture_output=True, text=True, check=True)

        result = subprocess.run(

            cmdline, capture_output=True, text=True, check=True, env=env

        )

        logging.debug(f"""

Shell Command: {result.args}

Output: