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==========
Installing
==========
Paramiko itself
===============
The recommended way to get Invoke is to **install the latest stable release**
via `pip <http://pip-installer.org>`_::
$ pip install paramiko
.. note::
Users who want the bleeding edge can install the development version via
``pip install paramiko==dev``.
We currently support **Python 2.5/2.6/2.7**, with support for Python 3 coming
soon. Users on Python 2.4 or older are urged to upgrade. Paramiko *may* work on
Python 2.4 still, but there is no longer any support guarantee.
Paramiko has two dependencies: the pure-Python ECDSA module `ecdsa`, and the
PyCrypto C extension. `ecdsa` is easily installable from wherever you
obtained Paramiko's package; PyCrypto may require more work. Read on for
details.
PyCrypto
========
`PyCrypto <https://www.dlitz.net/software/pycrypto/>`_ provides the low-level
(C-based) encryption algorithms we need to implement the SSH protocol. There
are a couple gotchas associated with installing PyCrypto: its compatibility
with Python's package tools, and the fact that it is a C-based extension.
.. _pycrypto-and-pip:
Possible gotcha on older Python and/or pip versions
---------------------------------------------------
We strongly recommend using ``pip`` to as it is newer and generally better than
``easy_install``. However, a combination of bugs in specific (now rather old)
versions of Python, ``pip`` and PyCrypto can prevent installation of PyCrypto.
Specifically:
* Python = 2.5.x
* PyCrypto >= 2.1 (required for most modern versions of Paramiko)
* ``pip`` < 0.8.1
When all three criteria are met, you may encounter ``No such file or
directory`` IOErrors when trying to ``pip install paramiko`` or ``pip install
PyCrypto``.
The fix is to make sure at least one of the above criteria is not met, by doing
the following (in order of preference):
* Upgrade to ``pip`` 0.8.1 or above, e.g. by running ``pip install -U pip``.
* Upgrade to Python 2.6 or above.
* Downgrade to Paramiko 1.7.6 or 1.7.7, which do not require PyCrypto >= 2.1,
and install PyCrypto 2.0.1 (the oldest version on PyPI which works with
Paramiko 1.7.6/1.7.7)
C extension
-----------
Unless you are installing from a precompiled source such as a Debian apt
repository or RedHat RPM, or using :ref:`pypm <pypm>`, you will also need the
ability to build Python C-based modules from source in order to install
PyCrypto. Users on **Unix-based platforms** such as Ubuntu or Mac OS X will
need the traditional C build toolchain installed (e.g. Developer Tools / XCode
Tools on the Mac, or the ``build-essential`` package on Ubuntu or Debian Linux
-- basically, anything with ``gcc``, ``make`` and so forth) as well as the
Python development libraries, often named ``python-dev`` or similar.
For **Windows** users we recommend using :ref:`pypm`, installing a C
development environment such as `Cygwin <http://cygwin.com>`_ or obtaining a
precompiled Win32 PyCrypto package from `voidspace's Python modules page
<http://www.voidspace.org.uk/python/modules.shtml#pycrypto>`_.
.. note::
Some Windows users whose Python is 64-bit have found that the PyCrypto
dependency ``winrandom`` may not install properly, leading to ImportErrors.
In this scenario, you'll probably need to compile ``winrandom`` yourself
via e.g. MS Visual Studio. See `Fabric #194
<https://github.com/fabric/fabric/issues/194>`_ for info.
.. _pypm:
ActivePython and PyPM
=====================
Windows users who already have ActiveState's `ActivePython
<http://www.activestate.com/activepython/downloads>`_ distribution installed
may find Paramiko is best installed with `its package manager, PyPM
<http://code.activestate.com/pypm/>`_. Below is example output from an
installation of Paramiko via ``pypm``::
C:\> pypm install paramiko
The following packages will be installed into "%APPDATA%\Python" (2.7):
paramiko-1.7.8 pycrypto-2.4
Get: [pypm-free.activestate.com] paramiko 1.7.8
Get: [pypm-free.activestate.com] pycrypto 2.4
Installing paramiko-1.7.8
Installing pycrypto-2.4
C:\>
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