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## Description
'''How to do a basic installation of MoinMoin on your system.'''

'''Contents'''
<<TableOfContents>>

Before you can integrate Moin``Moin into your web environment, you have to install the MoinMoin source code and data files using the standard Python ''distutils'' mechanism (`setup.py`). This page explains the steps you usually need to take to do this. For more details on the ''distutils'' installation process, consult the [[http://www.python.org/doc/current/inst/inst.html|Installing Python Modules]] document in your Python documentation set.

The installation is similar on Windows and Linux (and other POSIX-type systems; for simplicity, we just say "Linux" in the docs).

 (!) We use text such as '''`> command arguments`''' to show what you have to type at the command prompt (also known as shell, terminal, etc.). In our examples "`> `" is the prompt, you don't have to type it in, you have to type what comes after it. Lines that do not begin with "`> `" are the answers to the commands you have typed. Read them carefully.

= Check if Python is working =

Moin``Moin needs Python to run, so the first step is to check if an usable version of Python is installed and correctly set-up. If this is not the case, you will have to fix that before you can proceed.

The `CHANGES` file in the Moin``Moin archive mentions what versions are supported. Python 2.3 is the minimum requirement for Moin``Moin 1.7, but we suggest you use the latest Python release version.

You can download Python at [[http://www.python.org/download/]].

If you are pretty sure an acceptable version of Python is installed but the commands below do not work, this may be because your Python files are not in the ''search path''. Correctly setting the search path is outside the scope of this document; please ask for help on your favorite Python, Linux, or Windows discussion board.

If you have shell access, checking if Python is working is very simple. Just type the following command, and look at the result:
{{{
> python -V
Python 2.4.4
}}}

If you don't have shell access, you can try using this `pythontest.cgi` script (it assumes that you are using a Linux kind of webserver). Upload the script to your `cgi-bin` directory, use `chmod a+rx pythontest.cgi` (or a similar command in your FTP program) to make it executable, and invoke it using your web browser.

{{attachment:pythontest.cgi}}

If it doesn't display "CGI scripts work", well, then CGI scripts don't work. If it doesn't show one or more Python version numbers, then Python is not correctly installed. In both cases, before you can proceed, you will have to get in touch with the administrator of the server so that the problems get corrected.

Also be sure to read ../ApacheOnLinuxFtp after you've completed the ../BasicInstallation illustrated here.

= Download MoinMoin =

To download the distribution archive, go to the [[http://moinmo.in/MoinMoinDownload|download page]] and fetch the latest archive.

The next step is to unpack the distribution archive (which you have done already if you are reading this text from your hard drive). If you read this on the web, the distribution comes in a versioned `.tar.gz` archive, which you can unpack as shown below.

 * On Windows
    * You can use recent versions of programs like [[http://www.7-zip.org/|7-Zip]], Win``Zip, Win``Rar, and Win``Ace, which handle .tar.gz kind of archives.
    * At the command prompt, you can use [[http://gnuwin32.sourceforge.net/packages/gzip.htm|GNU gzip]] and [[http://gnuwin32.sourceforge.net/packages/tar.htm|GNU tar]] for Windows.
 * On Linux
    * You can use your favorite file manager -- it should be able to unpack them.
    * At any shell prompt, you can use the `tar` command.

The distribution archive will always unpack into a directory named `moin-<version>`, for example `moin-1.7.0`.

Here is how you would unpack the archive (using GNU tar) and enter the directory with the Moin``Moin files:
{{{
> tar xzf moin-1.7.0.tar.gz
> cd moin-1.7.0
}}}

= Install MoinMoin =

You can install Moin``Moin to either:
 * a system location (if you have the necessary rights to do that -- on Linux you need to be root)
 * some specific location, like your home directory (Linux) or `C:\moin` (Windows).

The installation to a system location is easier, so choose that if possible.

/!\ If you have several versions of Python installed, please use the same version for setup and for running the wiki. Usually, the latest Python version will get the best results.

== Recommended installation command for Linux (and MacOs X) ==
As you have chosen to not use a preconfigured package for your system this time it is highly recommended that you do not install MoinMoin into the default location. This is because otherwise, if you later want to install a moin package of your distribution this will overwrite your existing installation. The most common path for your own installations is below {{{/usr/local}}} (this is called the PREFIX). A command that should be ok for most Linux distributions and also MacOS X is

{{{
> python setup.py install --prefix='/usr/local' --record=install.log
}}}

This will install the shared files to '/usr/local/share/moin' and the moin code to `/usr/local/lib/python2.x/site-packages/MoinMoin/`.

== Debugging setup process ==

If you have problems with the `setup.py` install step, try using the command:
{{{
> python -v setup.py --quiet install --record=install.log
}}}

The additional `-v` flag should provide you detailed verbose messages every step of the way.

/!\ On Linux, if you get an error like `Invalid Python installation: cannot find /usr/lib/Python2.x/config/Makefile`, you may not have the python module '''`distutils`''' installed, it's usually a part of the '''Python development libarary (`python-dev`)'''. Some Linux distributions may not have installed it by default. For example, on Mandrake you need to install the '''`python-devel`''' package, on Debian it's called '''`python-dev`'''.

== Installing to the default system location ==

{{{
> python setup.py --quiet install --record=install.log
}}}

This installs Moin``Moin to the default system location (typically the Python directory, for example on Linux, inside `/usr/lib/python2.x/site-packages/MoinMoin` and `/usr/share/moin`). Look at the `install.log` file to see what was installed, and where.



== Installing in the home directory or another specific location ==

Linux example, installing in the home directory:
{{{
> python setup.py --quiet install --prefix=$HOME --record=install.log
}}}

Windows example, installing in the `C:\moin` directory:
{{{
> python setup.py --quiet install --prefix="C:\moin" --record=install.log
}}}

All Moin``Moin files will then be installed inside those directories, see `install.log` to know which files were installed, and where.

'''Note:''' You will likely see the following warning:

    `warning: install: modules installed to 'C:\moin\', which`<<BR>>
    `is not in Python's module search path (sys.path) -- you'll`<<BR>>
    `have to change the search path yourself`

This means exactly what it says, you need to add your install directory to the search path of Python, or it won't find the Moin``Moin code.

For example, if you are running using a webserver and standard CGI, edit `moin.cgi` and add your installation directory to the Python path, like this:
{{{
import sys
sys.path.insert(0, 'C:/moin')
}}}

= Test installation =

As a final step, if you have access to the shell or the command prompt, you can check that everything is correctly installed and ready to run. Start Python and type `import MoinMoin`. Nothing should be displayed in response to this command. Example:

{{{
> python
Python 2.4.4 (...)
Type "help", "copyright", "credits" or "license" for more information.
>>> import MoinMoin
>>>
}}}

If you get this instead:

{{{
>>> import MoinMoin
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
ImportError: No module named MoinMoin
>>>
}}}

then you have to tune your installation. Try modifying `sys.path`, as described above.

= What has been installed =

So, you have a ready-to-work Moin``Moin installation now. Congratulations! Before you go on to configuring it, take a look at the various files and directories that have been installed.

/!\ It is important that you understand the different locations used in a Moin``Moin setup, so read this carefully.

In the following descriptions, `PREFIX` is what you used with the `setup.py` command, or a default location if you didn't use the `--prefix` option. (Typical default values on Linux are `/usr` and `/usr/local`.) `X.Y` is the version of Python. Typically, this is `2.3`, `2.4` or `2.5`.

Look into `install.log` to find out about following important locations:

 * '''`MoinMoin` directory''', usually `PREFIX/lib/pythonX.Y/site-packages/MoinMoin` -- this is where the Moin``Moin '''source code''' is located
 * '''`share` directory''', usually `PREFIX/share/moin` - this is where the ''templates'' are located
  * '''`data`''' directory (wiki pages, users, etc.) - only Moin``Moin should access this
  * '''`underlay`''' directory (wiki pages) - only Moin``Moin should access this
  * '''`htdocs`''' directory with html support files (images for the various themes, etc.) - the web server will need to access this
  * '''`server`''' - Moin``Moin example startup files (like `moin.cgi` for CGI, and other files for other startup methods)
  * '''`config`''' - Moin``Moin example configuration files (like `wikiconfig.py`)
 * '''`bin`''' directory with some scripts that help you use the Moin``Moin shell commands

We talk of ''templates'' in the `share` directory because you usually will not use those files at that location, but copy them elsewhere when you need them. This way, you can set-up several wikis without problems, and easily upgrade to new Moin``Moin versions. Please see WikiInstanceCreation
