FIX: fetch static sample data files via pyfetch when DriveFS is unavailable in JupyterLite

Author: natinew77-creator

doc/conf.py

@@ -634,6 +634,35 @@
         "    else '/tmp/mne_data'\n"
         ")\n"
         "os.makedirs(mne_data_path, exist_ok=True)\n"
+        "if mne_data_path == '/tmp/mne_data':\n"
+        "    from pyodide.http import pyfetch\n"
+        "    sample_dir = os.path.join(mne_data_path, 'MNE-sample-data')\n"
+        "    for req in [\n"
+        "        'version.txt',\n"
+        "        'MEG/sample/sample_audvis_raw.fif',\n"
+        "        'MEG/sample/sample_audvis_filt-0-40_raw.fif',\n"
+        "        'MEG/sample/sample_audvis_raw-eve.fif',\n"
+        "        'MEG/sample/sample_audvis-ave.fif',\n"
+        "        'MEG/sample/sample_audvis-cov.fif',\n"
+        "        'MEG/sample/sample_audvis-meg-eeg-oct-6-fwd.fif',\n"
+        "        'MEG/sample/sample_audvis-meg-oct-6-meg-inv.fif',\n"
+        "        'subjects/sample/mri/T1.mgz',\n"
+        "        'subjects/sample/bem/sample-oct-6-src.fif',\n"
+        "        'subjects/sample/bem/sample-5120-5120-5120-bem-sol.fif',\n"
+        "        'subjects/sample/surf/rh.pial',\n"
+        "        'subjects/sample/surf/lh.pial',\n"
+        "    ]:\n"
+        "        dest = os.path.join(sample_dir, req)\n"
+        "        if not os.path.exists(dest):\n"
+        "            os.makedirs(os.path.dirname(dest), exist_ok=True)\n"
+        "            try:\n"
+        "                res = await pyfetch(\n"
+        "                    f'../files/mne_data/MNE-sample-data/{req}'\n"
+        "                )\n"
+        "                with open(dest, 'wb') as f:\n"
+        "                    f.write(await res.bytes())\n"
+        "            except Exception as e:\n"
+        "                print(f'Failed to fetch {req}: {e}')\n"
         "os.environ['MNE_DATA'] = mne_data_path\n"
         "os.environ['MNE_DATASETS_SAMPLE_PATH'] = mne_data_path\n"
         "\n"