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Fix PermissionError when checking template paths on shared filesystems - #2252
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Handle PermissionError that can occur when calling Path.exists() on template paths in _get_conf(). This issue can happen sporadically on shared/distributed filesystems (e.g., CephFS, NFS) due to: - Transient permission errors during metadata operations - Metadata cache coherency operations - Concurrent access to shared directories The fix mirrors the existing PermissionError handling in _template_paths() (lines 576-577 and 584-585) by wrapping the exists() check in a try/except block to gracefully skip paths that cannot be accessed. This resolves sporadic failures when running jupyter nbconvert in environments where JUPYTER_PATH contains shared filesystem directories.
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The sole failing check is saying 
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krassowski
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Jan 29, 2026
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It makes sense, indeed in Python older than 3.14 this could happen, as documented here:
https://docs.python.org/3/library/pathlib.html#querying-file-type-and-status
It is also in line with #2162
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PermissionError when checking template paths on shared filesystems
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Handle PermissionError that can occur when calling Path.exists() on template paths in _get_conf(). This issue can happen sporadically on shared/distributed filesystems (e.g., CephFS, NFS) due to:
The fix mirrors the existing PermissionError handling in _template_paths() (lines 576-577 and 584-585) by wrapping the exists() check in a try/except block to gracefully skip paths that cannot be accessed.
This resolves sporadic failures when running jupyter nbconvert in environments where JUPYTER_PATH contains shared filesystem directories.