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@ejucovy
Created October 16, 2013 13:35
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Trac WSGI script that sets database uri from environment variable
import os
import trac.web.main
from trac.env import open_environment, Environment
from trac.util import translation
import gc
import threading
def application(environ, start_response):
req = trac.web.main.RequestWithSession(environ, start_response)
run_once = environ['wsgi.run_once']
env = env_error = None
try:
env = Environment(os.environ['TRAC_ENV'])
if env.base_url_for_redirect:
environ['trac.base_url'] = env.base_url
# Web front-end type and version information
if not hasattr(env, 'webfrontend'):
mod_wsgi_version = environ.get('mod_wsgi.version')
if mod_wsgi_version:
mod_wsgi_version = (
"%s (WSGIProcessGroup %s WSGIApplicationGroup %s)" %
('.'.join([str(x) for x in mod_wsgi_version]),
environ.get('mod_wsgi.process_group'),
environ.get('mod_wsgi.application_group') or
'%{GLOBAL}'))
environ.update({
'trac.web.frontend': 'mod_wsgi',
'trac.web.version': mod_wsgi_version})
env.webfrontend = environ.get('trac.web.frontend')
if env.webfrontend:
env.systeminfo.append((env.webfrontend,
environ['trac.web.version']))
except Exception, e:
env_error = e
print "Persistent database setting is %s" % env.config.get("trac", "database")
if 'TRAC_DATABASE' in os.environ:
env.config.set("trac", "database", os.environ['TRAC_DATABASE'])
print "Overriding persistent database setting with %s" % env.config.get("trac", "database")
translation.make_activable(lambda: req.locale, env.path if env else None)
try:
return trac.web.main._dispatch_request(req, env, env_error)
finally:
translation.deactivate()
if env and not run_once:
env.shutdown(threading._get_ident())
unreachable = gc.collect()
@ejucovy
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ejucovy commented Oct 16, 2013

I had to instantiate an Environment() directly instead of using open_environment() because the latter sets up a database connection in order to check if the environment needs to be upgraded .. so then it doesn't have any effect if I change the database config value after the connection has been opened.

But, this way the site will probably fail to check setup participants' environment_needs_upgrade functions .. so that probably needs to be added back in somewhere.

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