This is a pre-production deployment of Warehouse, however changes made here WILL affect the production instance of PyPI.
Latest Version Dependencies status unknown Test status unknown Test coverage unknown
Project Description

fslib is a wrapper around Python’s os.* low-level functions, aiming to:

  • Provide more pythonic APIs for low-level primitives
  • Merge various physical locations into a simple pseudo-filesystem for the application
  • Handle UnionFS-like features, including transparent write overlay on top of read-only paths

fslib supports Python 2.7 and 3.3+; it requires only the standard Python library.

Download

PyPI: https://pypi.python.org/pypi/fslib/

$ pip install fslib

Source: https://github.com/rbarrois/fslib/

$ git clone git://github.com/rbarrois/fslib/
$ python setup.py install

Usage

Replacing import os

>>> import fslib
>>>
>>> fs = fslib.FileSystem(fslib.OSFS('/'))
>>> fs.dir_exists('/etc/')
True
>>> fs.listdir('/')
['/etc', '/dev', '/proc']

Forcing read-only

In order to ensure that user code doesn’t change any physical file, fslib provides a simple wrapper that prevents writing to the filesystem.

>>> import fslib
>>> import fslib.stacking
>>>
>>> fs = fslib.FileSystem(fslib.stacking.ReadOnlyFS(fslib.OSFS('/')))
>>> fs.read_one_line('/etc/hostname')
"ithor"
>>> fs.open('/tmp/x', 'w')
OSError: [Errno 30] Read-only file system: '/tmp/x'

UnionFS-like mounting

fslib provides a UnionFS-like wrapper as fslib.stacking.UnionFS. This backend will provide a merged view of several branch, redirecting all writes to the branch(es) declared writable=True.

>>> import fslib, fslib.builders, fslib.stacking
>>>
>>> mem_fs = fslib.builders.make_memory_fake()
>>> union_fs = fslib.stacking.UnionFS()
>>> union_fs.add_branch(mem_fs, ref='memory', rank=0, writable=True)
>>> union_fs.add_branch(fslib.stacking.ReadOnlyFS(fslib.OSFS('/')), ref='os', rank=1)
>>>
>>> fs = fslib.FileSystem(backend=union_fs)
>>> fs.writelines('/tmp/x', ['aa', 'bb'])
>>>
>>> open('/tmp/x', 'r')
IOError: [Errno 2] No such file or directory: '/tmp/x'
>>> fs.file_exists('/tmp/x')
True
>>> fs.readlines('/tmp/x')
['aa', 'bb']
>>> fs.access('/tmp/x', os.F_OK)
True

Unix-like filesystem tree

It is possible to “overlay” physical or virtual file systems to present a simple, unified structure to the program.

>>> import fslib, fslib.stacking
>>> mnt = fslib.MountFS()
>>> mnt.mount_fs('/', fslib.stacking.ReadOnlyFS(fslib.OSFS('/')))
>>> mnt.mount_fs('/home/xelnor/.myapp', fslib.stacking.MemoryFS())
>>> mnt.mount_fs('/home/xelnor/.myapp/cache', fslib.OSFS('/tmp/myapp/shared_cache'))

With this setup:

  • All reads/writes to /home/xelnor/.myapp/cache will actually occur within /tmp/myapp/shared_cache
  • All reads/writes within /home/xelnor/.myapp (except for /cache) will occur in memory
  • No write will be permitted anywhere else.
Release History

Release History

0.2.1

This version

History Node

TODO: Figure out how to actually get changelog content.

Changelog content for this version goes here.

Donec et mollis dolor. Praesent et diam eget libero egestas mattis sit amet vitae augue. Nam tincidunt congue enim, ut porta lorem lacinia consectetur. Donec ut libero sed arcu vehicula ultricies a non tortor. Lorem ipsum dolor sit amet, consectetur adipiscing elit.

Show More

0.2.0

History Node

TODO: Figure out how to actually get changelog content.

Changelog content for this version goes here.

Donec et mollis dolor. Praesent et diam eget libero egestas mattis sit amet vitae augue. Nam tincidunt congue enim, ut porta lorem lacinia consectetur. Donec ut libero sed arcu vehicula ultricies a non tortor. Lorem ipsum dolor sit amet, consectetur adipiscing elit.

Show More

Download Files

Download Files

TODO: Brief introduction on what you do with files - including link to relevant help section.

File Name & Checksum SHA256 Checksum Help Version File Type Upload Date
fslib-0.2.1.tar.gz (14.8 kB) Copy SHA256 Checksum SHA256 Source Jan 3, 2014

Supported By

WebFaction WebFaction Technical Writing Elastic Elastic Search Pingdom Pingdom Monitoring Dyn Dyn DNS HPE HPE Development Sentry Sentry Error Logging CloudAMQP CloudAMQP RabbitMQ Heroku Heroku PaaS Kabu Creative Kabu Creative UX & Design Fastly Fastly CDN DigiCert DigiCert EV Certificate Rackspace Rackspace Cloud Servers DreamHost DreamHost Log Hosting