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.. _installing_chapter:
Installing :mod:`repoze.bfg`
============================
Before You Install
------------------
You will need `Python <http://python.org>`_ version 2.4 or better to
run :mod:`repoze.bfg`. It has been tested under Python 2.4.5, Python
2.5.2 and Python 2.6. Development of :mod:`repoze.bfg` is currently
done primarily under Python 2.4. :mod:`repoze.bfg` does *not* run
under any version of Python before 2.4, and does *not* run under
Python 3.X.
.. note:: You will need :term:`setuptools` installed
on within your Python system in order to run the ``easy_install``
command.
.. note:: As of version 0.8.0, installation of :mod:`repoze.bfg` does
not require the compilation of any C code, so you do not need to
have development tools installed on the target machine.
Although BFG is known to run properly on all Unix-like systems, at the
time of this writing, ``repoze.bfg`` is not tested on Windows systems.
It might run; it might not. There's nothing intrinsic about
:mod:`repoze.bfg` that would prevent it from running on Windows, but
none of the current developers use the platform. Likewise for
platforms like Jython, and Google App Engine; it may run, it may not.
.. note:: If you'd like to help make sure :mod:`repoze.bfg` keeps
.. running on your favorite alternate platform, we'd love to hear from
you. Please contact us via the `repoze.dev maillist
<http://lists.repoze.org/listinfo/repoze-dev>`_ if you'd like to
contribute.
Installing :mod:`repoze.bfg`
----------------------------
It is advisable to install :mod:`repoze.bfg` into a :term:`virtualenv`
in order to obtain isolation from any "system" packages you've got
installed in your Python version (and likewise, to prevent
:mod:`repoze.bfg` from globally installing versions of packages that
are not compatible with your system Python).
To set up a virtualenv to install :mod:`repoze.bfg` within, first
ensure that setuptools is installed. Invoke ``import setuptools``
within the Python interpreter you'd like to run :mod:`repoze.bfg`
under.
.. code-block:: bash
[chrism@vitaminf bfg]$ python
Python 2.4.5 (#1, Aug 29 2008, 12:27:37)
[GCC 4.0.1 (Apple Inc. build 5465)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import setuptools
If ``import setuptools`` does not raise an ``ImportError``, it means
that setuptools is already installed into your Python interpreter. If
``import setuptools`` fails, you will need to install setuptools
manually. If you are using a "system" Python (one installed by your
OS distributor or a 3rd-party packager such as Fink or MacPorts), you
can usually install a setuptools package using your system's package
manager. If you cannot do this, or if you're using a self-installed
version of Python, you will need to install setuptools "by hand".
Installing setuptools "by hand" is always a reasonable thing to do,
even if your package manager already has a pre-chewed version of
setuptools for installation.
To install setuptools by hand, first download `ez_setup.py
<http://peak.telecommunity.com/dist/ez_setup.py>`_ then invoke it
using the Python interpreter you want to install setuptools into.
.. code-block:: bash
$ python ez_setup.py
Once this command is invoked, setuptools should be installed on your
system. If the command fails due to permission errors, you may need
to be the administrative user on your system to successfully invoke
the script.
Installing the ``virtualenv`` Package
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Once you've got setuptools installed, you should install the
:term:`virtualenv` package. To install the :term:`virtualenv` package
into your setuptools-enabled Python interpreter, use the
``easy_install`` command.
.. code-block:: bash
$ easy_install virtualenv
This command should succeed, and tell you that the virtualenv package
is now installed. If it fails due to permission errors, you may need
to install it as your system's administrative user.
Creating the Virtual Python Environment
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Once the :term:`virtualenv` package is installed in your Python, you
can actually create a virtual environment. To do so, invoke the
following:
.. code-block:: bash
:linenos:
$ virtualenv --no-site-packages bfgenv
New python executable in bfgenv/bin/python
Installing setuptools.............done.
.. warning:: Using ``--no-site-packages`` when generating your
virtualenv is *very important*. This flag provides the necessary
isolation for running the set of packages required by
:mod:`repoze.bfg`. If you do not specify ``--no-site-packages``,
it's possible that :mod:`repoze.bfg` will not install properly into
the virtualenv, or, even if it does, may not run properly,
depending on the packages you've already got installed into your
Python's "main" site-packages dir.
You should perform any following commands that mention a "bin"
directory from within the ``bfgenv`` virtualenv dir.
Installing :mod:`repoze.bfg` Into the Virtual Python Environment
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
After you've got your ``bfgenv`` virtualenv installed, you may install
:mod:`repoze.bfg` itself using the following commands from within the
virtualenv (``bfgenv``) directory:
.. code-block:: bash
:linenos:
$ bin/easy_install -i http://dist.repoze.org/bfg/current/simple repoze.bfg
.. warning:: Note carefully the ``-i
http://dist.repoze.org/bfg/current/simple`` above. It is required.
:mod:`repoze.bfg` software is maintained in its own index;
:mod:`repoze.bfg` cannot be installed from PyPI.
This command will take longer than the previous ones to complete, as it
downloads and installs a number of dependencies.
What Gets Installed
~~~~~~~~~~~~~~~~~~~
When you ``easy_install`` :mod:`repoze.bfg`, various Zope libraries,
various Chameleon libraries, WebOb, Paste, PasteScript, and
PasteDeploy libraries are installed.
Additionally, as shown in the next section, PasteScript (aka *paster*)
templates will be registered that make it easy to start a new
:mod:`repoze.bfg` project.
|
