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provides atomic and durable writes on a posix file system.

Project description


posixfs provides context managers and functions to manipulate files on a POSIX file system with atomicity and durability. The module is intended to be simple and straightforward to use.

The module is written in Python 3 with types annotated and using pathlib.Path.


import pathlib

import posixfs

# write bytes to a file atomically and durably
pth = pathlib.Path("/some/file.txt")
posixfs.atomic_write_bytes(path=pth, data=b"hello", durable=True)

# write text to a file atomically and durably
posixfs.atomic_write_bytes(path=pth, text="hello", durable=True)

# use context manager
with posixfs.AtomicWritingText(path=pth, durable=True) as file:
    file.write('how do you do?\n')


  • Create a virtual environment:

python3 -m venv venv3
  • Activate it:

source venv3/bin/activate
  • Install posixfs with pip:

pip3 install posixfs


  • Check out the repository.

  • In the repository root, create the virtual environment:

python3 -m venv venv3
  • Activate the virtual environment:

source venv3/bin/activate
  • Install the development dependencies:

pip3 install -e .[dev]
  • We use tox for testing and packaging the distribution. Assuming that the virtual environment has been activated and the development dependencies have been installed, run:

  • We also provide a set of pre-commit checks that lint and check code for formatting. Run them locally from an activated virtual environment with development dependencies:

  • The pre-commit script can also automatically format the code:

./  --overwrite


We follow Semantic Versioning. The version X.Y.Z indicates:

  • X is the major version (backward-incompatible),

  • Y is the minor version (backward-compatible), and

  • Z is the patch version (backward-compatible bug fix).

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