Allow tracd to select environment with Host header

[rob.nikander@…]

It would be nice to run one instance of tracd, for multiple projects, and have it serve them from URLs that differ only in hostname, like:

• http://apples.domain.com/
• http://bananas.domain.com/

[Jun Omae]

You could use custom trac.wsgi script with an wsgi container (e.g. mod_wsgi) like this:

#! /usr/bin/python
# -*- coding: utf-8 -*-

import os
import re

from trac.web.main import dispatch_request


_envs_dir = '/path/to/trac'

_host_re = re.compile(r'([A-Za-z._-]+)(?::[0-9]+)?\Z')


def _get_env_path(environ):
    host = environ.get('HTTP_HOST')
    if not host:
        return None
    match = _host_re.match(host)
    if not match:
        return None
    host = match.group(1).rstrip('.').lower()
    if not host:
        return None
    env_path = os.path.join(_envs_dir, host)
    if not os.path.isdir(env_path):
        return None
    return env_path


def application(environ, start_request):
    if 'PYTHON_EGG_CACHE' in environ:
        os.environ['PYTHON_EGG_CACHE'] = environ['PYTHON_EGG_CACHE']

    env_path = _get_env_path(environ)
    if env_path:
        environ['trac.env_path'] = env_path
        return dispatch_request(environ, start_request)
    else:
        status = '404 Not Found'
        output = 'Not Found'
        headers = [('Content-Type', 'text/plain'),
                   ('Content-Length', str(len(output)))]
        start_request(status, headers)
        return [output]

Also, I recommend to use an wsgi container rather than tracd.

[rob.nikander@…]

I'm using nginx for a webserver, and the TracNginxRecipe recommends I use tracd. No mention on that page of wsgi and I'm guessing that's only for Apache. ?

[Jun Omae]

You can use ​pypi:uWSGI with nginx.

[Ryan J Ollos]

If the custom trac.wsgi script (comment:1) is generally useful, it could be a good addition to the CookBook.