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Add doc for building pyOpenSSL.

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Signed-off-by: Daira Hopwood <daira@jacaranda.org>
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Daira Hopwood 2015-05-01 18:45:19 +01:00
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Building pyOpenSSL on Windows-7 (64-bit)
========================================
This document details the steps to build an pyOpenSSL egg with embedded
OpenSSL library, for use by Tahoe-LAFS on Windows.
The instructions were tried on Windows-7 64-bit. Building on a 32-bit machine
shouldn't be too different.
Download and install Microsoft Visual C++ compiler for Python 2.7
-----------------------------------------------------------------
For reasons detailed in `the Python documentation`_, Python extension modules
need to be built using a compiler compatible with the same version of Visual C++
that was used to build Python itself. Until recently, this meant downloading
Microsoft Visual Studio 2008 Express Edition and Windows SDK 3.5. The recent
release of the Microsoft Visual C++ compiler for Python 2.7 made things a lot
simpler.
So, the first step is to download and install the C++ compiler from Microsoft
from `this link`_.
.. _the Python documentation: https://docs.python.org/2/extending/windows.html
.. _this link: https://www.microsoft.com/en-us/download/details.aspx?id=44266
Download and install Perl
-------------------------
Download and install ActiveState Perl:
* go to `the ActiveState Perl download page`_.
* identify the correct link and manually change it from http to https.
.. _the ActiveState Perl download page: https://www.activestate.com/activeperl/downloads
Download and install the latest OpenSSL version
-----------------------------------------------
* Download the latest OpenSSL from `the OpenSSL source download page`_ and untar it.
At the time of writing, the latest version was OpenSSL 1.0.1m.
* Set up the build environment::
"%USERPROFILE%\AppData\Local\Programs\Common\Microsoft\Visual C++ for Python\9.0\vcvarsall.bat" amd64
* Go to the untar'ed OpenSSL source base directory and run the following commands::
mkdir c:\dist
perl Configure VC-WIN64A --prefix=c:\dist\openssl64 no-asm enable-tlsext
ms\do_win64a.bat
nmake -f ms\ntdll.mak
nmake -f ms\ntdll.mak install
To check that it is working, run ``c:\dist\openssl64\bin\openssl version``.
.. _the OpenSSL source download page: https://www.openssl.org/source/
Building PyOpenSSL
------------------
* Download and untar pyOpenSSL 0.13.1 (see `ticket #2221`_ for why we
currently use this version). The MD5 hash of pyOpenSSL-0.13.1.tar.gz is
e27a3b76734c39ea03952ca94cc56715.
* Set up the build environment::
"%USERPROFILE%\AppData\Local\Programs\Common\Microsoft\Visual C++ for Python\9.0\vcvarsall.bat" amd64
* Set OpenSSL ``LIB``, ``INCLUDE`` and ``PATH``::
set LIB=c:\dist\openssl64\lib;%LIB%
set INCLUDE=c:\dist\openssl64\include;%INCLUDE%
set PATH=c:\dist\openssl64\bin;%PATH%
* A workaround is needed to ensure that the setuptools ``bdist_egg`` command
is available. Edit pyOpenSSL's ``setup.py`` around line 13 as follows::
< from distutils.core import Extension, setup
---
> from setuptools import setup
> from distutils.core import Extension
* Run ``python setup.py bdist_egg``
The generated egg will be in the ``dist`` directory. It is a good idea
to check that Tahoe-LAFS is able to use it before uploading the egg to
tahoe-lafs.org. This can be done by putting it in the ``tahoe-deps`` directory
of a Tahoe-LAFS checkout or release, then running ``python setup.py test``.
.. _ticket #2221: https://tahoe-lafs.org/trac/tahoe-lafs/ticket/2221