Update littlefs-python requirement from >=0.9.0 to >=0.18.0

[dependabot]

Updates the requirements on littlefs-python to permit the latest version.

Release notes

Sourced from littlefs-python's releases.

v0.18.0

UTF-8 filenames by default

The default filename encoding has changed from ASCII to UTF-8 (littlefs.lfs.FILENAME_ENCODING).

littlefs stores names as opaque byte strings, so the API-level encoding is a free choice. Previously the ASCII default rejected any non-ASCII filename with a UnicodeEncodeError (and decoded directory entries as ASCII as well). Now non-ASCII names — Latin-1, CJK, emoji, etc. — round-trip cleanly through open, stat, listdir/scandir, mkdir, rename, and remove.

This change is backward compatible: ASCII is a strict subset of UTF-8, so all existing filenames encode and decode identically. New regression tests cover Latin-1, CJK, and astral-plane (emoji) filenames.

Thanks to @​slash-proc for their first contribution! (PR #168)

Configurable per-instance filename encoding

Building on the UTF-8 default, the filename encoding is now selectable per filesystem instead of relying solely on the process-wide lfs.FILENAME_ENCODING global:

# Read an image whose names were written with a non-UTF-8 codec
fs = LittleFS(..., filename_encoding="shift-jis")

• LittleFS(filename_encoding=...) threads the chosen encoding through every path-handling call (open, stat, listdir/scandir, mkdir, remove, rename, and the *attr methods).
• The low-level lfs.* functions accept an optional filename_encoding argument that falls back to the module global, so existing callers are unaffected.
• Useful for images whose names were written with a non-UTF-8 encoding (e.g. latin-1, shift-jis) that would otherwise mis-decode or raise.

New CLI options

The littlefs-python CLI gained several options on the shared parser, available to the create, extract, list, and repl commands:

• --attr-max — maximum custom attribute size per file.
• --file-max — maximum file size.
• --inline-max — maximum inline file size (limiting this can improve flash usage); 0 uses the library default.
• --filename-encoding — encode/decode image filenames with a non-UTF-8 codec (e.g. latin-1, shift-jis); defaults to UTF-8.

Note the distinction surfaced in the help text and docs:

• --name-max, --attr-max, and --file-max are stored in the image superblock and must match when mounting an existing image.
• --inline-max is a format-time option.
• --filename-encoding is a host-side encode/decode choice that is never stored in the image. You must extract an image with the same --filename-encoding that was used to create it, otherwise filenames will fail to decode or come out as mojibake.

Thanks to @​amgross for the additional CLI options! (PR #160)

Bug Fixes

• scandir directory-handle leak: directory iteration is now wrapped in try/finally so the underlying handle is always closed via dir_close, even if a read raises mid-iteration (e.g. a UnicodeDecodeError from a mismatched filename encoding).
• lfs.file_sync return value: now returns the error code, matching its -> int type stub and the behavior of every other file_* function (it was the lone outlier returning None).
• Type stubs: lfs.dir_read is now annotated as returning Optional[LFSStat] (it returns None at end-of-directory).

CI / Dependencies

... (truncated)

Commits

• fcd02ba Merge pull request #168 from slash-proc/utf8-filename-encoding
• d1957b9 Address Copilot review: stub/return fixes and scandir handle leak
• 0c98531 Document that name_max is a byte limit in filename_encoding docstring
• 50c4a36 Expose --filename-encoding on the CLI
• a100817 Add per-instance filename_encoding option
• ce3a789 Use UTF-8 for filename encoding instead of ASCII
• d386238 Bump pypa/gh-action-pypi-publish from 1.13.0 to 1.14.0
• 19350e5 Bump pypa/cibuildwheel from 3.3.1 to 3.4.1
• 7fa189d Merge pull request #160 from amgross/add_cli_options
• e98a2f2 Add more needed options to CLI
• Additional commits viewable in compare view

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