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Source Repository: https://github.com/chrissimpkins/shellescape
Description
-----------
The shellescape Python module defines the ``shellescape.quote()`` function that returns a shell-escaped version of a Python string. This is a backport of the ``shlex.quote()`` function from Python 3.4.3 that makes it accessible to users of Python 3 versions < 3.3 and all Python 2.x versions.
quote(s)
--------
From the Python documentation:
Return a shell-escaped version of the string s. The returned value is a string that can safely be used as one token in a shell command line, for cases where you cannot use a list.
This idiom would be unsafe:
.. code-block:: python
>>> filename = 'somefile; rm -rf ~'
>>> command = 'ls -l {}'.format(filename)
>>> print(command) # executed by a shell: boom!
ls -l somefile; rm -rf ~
``quote()`` lets you plug the security hole:
.. code-block:: python
>>> command = 'ls -l {}'.format(quote(filename))
>>> print(command)
ls -l 'somefile; rm -rf ~'
>>> remote_command = 'ssh home {}'.format(quote(command))
>>> print(remote_command)
ssh home 'ls -l '"'"'somefile; rm -rf ~'"'"''
The quoting is compatible with UNIX shells and with ``shlex.split()``:
.. code-block:: python
>>> remote_command = split(remote_command)
>>> remote_command
['ssh', 'home', "ls -l 'somefile; rm -rf ~'"]
>>> command = split(remote_command[-1])
>>> command
['ls', '-l', 'somefile; rm -rf ~']
Usage
-----
Include ``shellescape`` in your project setup.py file ``install_requires`` dependency definition list:
.. code-block:: python
setup(
...
install_requires=['shellescape'],
...
)
Then import the ``quote`` function into your module(s) and use it as needed:
.. code-block:: python
#!/usr/bin/env python
# -*- coding: utf-8 -*-
from shellescape import quote
filename = "somefile; rm -rf ~"
escaped_shell_command = 'ls -l {}'.format(quote(filename))
Issue Reporting
---------------
Issue reporting is available on the `GitHub repository <https://github.com/chrissimpkins/shellescape/issues>`_
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