littlefs-python 0.4.0

A python wrapper for littlefs

littlefs-python provides a thin wrapper around littlefs, a filesystem targeted for small embedded systems. The wrapper provides a pythonic interface to the filesystem and allows the creation, inspection and modification of the filesystem or individual files. Even if this package uses Cython, the goal is not to provide a high performance implementation. Cython was chosen as an easy method is offered to generate the binding and the littlefs library in one step.

Quick Examples

Let’s create a image ready to transfer to a flash memory using the pythonic interface:

from littlefs import LittleFS

# Initialize the File System according to your specifications
fs = LittleFS(block_size=512, block_count=256)

# Open a file and write some content
with fs.open('first-file.txt', 'w') as fh:
    fh.write('Some text to begin with\n')

# Dump the filesystem content to a file
with open('FlashMemory.bin', 'wb') as fh:
    fh.write(fs.context.buffer)

The same can be done by using the more verbose C-Style API, which closely resembles the steps which must be performed in C:

from littlefs import lfs

cfg = lfs.LFSConfig(block_size=512, block_count=256)
fs = lfs.LFSFilesystem()

# Format and mount the filesystem
lfs.format(fs, cfg)
lfs.mount(fs, cfg)

# Open a file and write some content
fh = lfs.file_open(fs, 'first-file.txt', 'w')
lfs.file_write(fs, fh, b'Some text to begin with\n')
lfs.file_close(fs, fh)

# Dump the filesystem content to a file
with open('FlashMemory.bin', 'wb') as fh:
    fh.write(cfg.user_context.buffer)

Installation

This is as simple as it can be:

pip install littlefs-python

At the moment wheels (which require no build) are provided for the following platforms, on other platforms the source package is used and a compiler is required:

• Linux: Python 3.6 - 3.10 / 32- & 64-bit

• Windows: Python 3.6 - 3.10 / 32- & 64-bit

Development Setup

Start by checking out the source repository of littlefs-python:

git clone https://github.com/jrast/littlefs-python.git

The source code for littlefs is included as a submodule which must be checked out after the clone:

cd <littlefs-python>
git submodule update --init

this ensures that the correct version of littlefs is cloned into the littlefs folder. As a next step install the dependencies and install the package:

pip install -r requirements.txt
pip install -e .

Note

It’s highly recommended to install the package in a virtual environment!

Development Hints

• Test should be run before commiting: pytest test

• Mypy is used for typechecking. Run it also on the tests to catch more issues: mypy src test test/lfs

• Mypy stubs can be generated with stubgen src. This will create a out direcotry containing the generated stub files.

Creating a new release

• Make sure the master branch is in the state you want it.

• Create a tag with the new version number

• Wait until all builds are completed. A new release should be created automatically on github.

• Build the source distribution with python setup.py sdist

• Download all assets (using ci/download_release_files.py)

• Upload to pypi using twine: twine upload dist/*