export wasm fails on NixOS

[skaphi]

Describe the bug

On NixOS all packages including marimo are stored in /nix/store which is read only. shutils.copytree preserves permissions, thus we get the following denied write issue

$ marimo export html-wasm noob.py -o tester/ --mode edit
Traceback (most recent call last):
  File "/nix/store/z6q0wiws633hxixrnjyshk8n641iw41m-python3.13-marimo-0.23.6/bin/.marimo-wrapped", line 9, in <module>
    sys.exit(main())
             ~~~~^^
  File "/nix/store/knzx18kqdy77ckzzd2qm94qbxdpvkay9-python3.13-click-8.3.1/lib/python3.13/site-packages/click/core.py", line 1485, in __call__
    return self.main(*args, **kwargs)
           ~~~~~~~~~^^^^^^^^^^^^^^^^^
  File "/nix/store/knzx18kqdy77ckzzd2qm94qbxdpvkay9-python3.13-click-8.3.1/lib/python3.13/site-packages/click/core.py", line 1406, in main
    rv = self.invoke(ctx)
  File "/nix/store/knzx18kqdy77ckzzd2qm94qbxdpvkay9-python3.13-click-8.3.1/lib/python3.13/site-packages/click/core.py", line 1873, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
                           ~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^
  File "/nix/store/knzx18kqdy77ckzzd2qm94qbxdpvkay9-python3.13-click-8.3.1/lib/python3.13/site-packages/click/core.py", line 1873, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
                           ~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^
  File "/nix/store/knzx18kqdy77ckzzd2qm94qbxdpvkay9-python3.13-click-8.3.1/lib/python3.13/site-packages/click/core.py", line 1269, in invoke
    return ctx.invoke(self.callback, **ctx.params)
           ~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/nix/store/knzx18kqdy77ckzzd2qm94qbxdpvkay9-python3.13-click-8.3.1/lib/python3.13/site-packages/click/core.py", line 824, in invoke
    return callback(*args, **kwargs)
  File "/nix/store/z6q0wiws633hxixrnjyshk8n641iw41m-python3.13-marimo-0.23.6/lib/python3.13/site-packages/marimo/_cli/export/commands.py", line 954, in html_wasm
    (Path(out_dir) / ".nojekyll").touch()
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^
  File "/nix/store/60m4rxhg2fldqaak400c0lry96ijrzqn-python3-3.13.13/lib/python3.13/pathlib/_local.py", line 714, in touch
    fd = os.open(self, flags, mode)
PermissionError: [Errno 13] Permission denied: 'tester/.nojekyll'

Will you submit a PR?

• Yes

Environment

Details

$ marimo env
{
  "marimo": "0.23.6",
  "editable": false,
  "location": "/nix/store/7d0xrq4c3r0kjxk5p7dnnyj7a7sz2ipw-python3.13-marimo-0.23.6/lib/python3.13/site-packages/marimo",
  "OS": "Linux",
  "OS Version": "6.18.35",
  "Processor": "",
  "Python Version": "3.13.13",
  "Locale": "--",
  "Binaries": {
    "Browser": "--",
    "Node": "v24.15.0",
    "uv": "0.11.19 (x86_64-unknown-linux-gnu)"
  },
  "Dependencies": {
    "click": "8.3.1",
    "docutils": "0.22.4",
    "itsdangerous": "2.2.0",
    "jedi": "0.20.0",
    "markdown": "3.10.2",
    "narwhals": "2.16.0",
    "packaging": "26.1",
    "psutil": "7.2.2",
    "pygments": "2.20.0",
    "pymdown-extensions": "10.21.2",
    "pyyaml": "6.0.3",
    "starlette": "0.52.1",
    "tomlkit": "0.14.0",
    "typing-extensions": "4.15.0",
    "uvicorn": "0.40.0",
    "websockets": "16.0"
  },
  "Optional Dependencies": {
    "altair": "6.1.0",
    "anywidget": "0.9.21",
    "duckdb": "1.5.2",
    "loro": "1.10.3",
    "nbformat": "5.10.4",
    "pandas": "2.3.3",
    "polars": "1.40.1",
    "pyarrow": "23.0.0",
    "python-lsp-server": "1.14.0",
    "ruff": "0.15.16",
    "sqlglot": "28.9.0",
    "watchdog": "6.0.0"
  },
  "Experimental Flags": {}
}

Code to reproduce

No response

[skaphi]

Other Nix related PR: #9942