Assert read permissions of trac.ini to avoid misleading error messages

[sfish]

I've been running 4 projects on trac 0.9 for about a year now, recently I upgraded to 0.10.4 and were still able to run it like before. All my trac projects are using postgres as their dbms. Now, when I changed from running tracd (the standalone trac webserver) to use fastcgi and lighttpd, I get this "assert pysqlite" failure, even though I never had and still don't have (or use) (py)sqlite.

Here's the error output:

AssertionError	Python 2.4.2: /usr/local/bin/python
Sat Oct 20 13:09:58 2007

A problem occurred in a Python script. Here is the sequence of function calls leading up to the error, in the order they occurred.
 /usr/local/lib/python2.4/site-packages/trac/web/_fcgi.py in run(self=<trac.web._fcgi.Request object>)
  568         """Runs the handler, flushes the streams, and ends the request."""
  569         try:
  570             protocolStatus, appStatus = self.server.handler(self)
  571         except:
  572             traceback.print_exc(file=self.stderr)
protocolStatus undefined, appStatus undefined, self = <trac.web._fcgi.Request object>, self.server = <trac.web._fcgi.WSGIServer object>, self.server.handler = <bound method WSGIServer.handler of <trac.web._fcgi.WSGIServer object>>
 /usr/local/lib/python2.4/site-packages/trac/web/_fcgi.py in handler(self=<trac.web._fcgi.WSGIServer object>, req=<trac.web._fcgi.Request object>)
 1254         try:
 1255             try:
 1256                 result = self.application(environ, start_response)
 1257                 try:
 1258                     for data in result:
result = None, self = <trac.web._fcgi.WSGIServer object>, self.application = <function dispatch_request>, environ = {'DOCUMENT_ROOT': '/var/lhttpd/htdocs_default/', 'GATEWAY_INTERFACE': 'CGI/1.1', 'HTTPS': 'on', 'HTTP_ACCEPT': 'text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5', 'HTTP_ACCEPT_CHARSET': 'ISO-8859-1,utf-8;q=0.7,*;q=0.7', 'HTTP_ACCEPT_ENCODING': 'gzip,deflate', 'HTTP_ACCEPT_LANGUAGE': 'en-us,en;q=0.5', 'HTTP_CACHE_CONTROL': 'max-age=0', 'HTTP_CONNECTION': 'keep-alive', 'HTTP_HOST': 'www.veloci.se:7777', ...}, start_response = <function start_response>
 /usr/local/lib/python2.4/site-packages/trac/web/main.py in dispatch_request(environ={'DOCUMENT_ROOT': '/var/lhttpd/htdocs_default/', 'GATEWAY_INTERFACE': 'CGI/1.1', 'HTTPS': 'on', 'HTTP_ACCEPT': 'text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5', 'HTTP_ACCEPT_CHARSET': 'ISO-8859-1,utf-8;q=0.7,*;q=0.7', 'HTTP_ACCEPT_ENCODING': 'gzip,deflate', 'HTTP_ACCEPT_LANGUAGE': 'en-us,en;q=0.5', 'HTTP_CACHE_CONTROL': 'max-age=0', 'HTTP_CONNECTION': 'keep-alive', 'HTTP_HOST': 'www.veloci.se:7777', ...}, start_response=<function start_response>)
  389     env = env_error = None
  390     try:
  391         env = _open_environment(env_path, run_once=run_once)
  392         if env.base_url:
  393             environ['trac.base_url'] = env.base_url
env = None, global _open_environment = <function _open_environment>, env_path = '/var/trac/projects/foo', run_once = False
 /usr/local/lib/python2.4/site-packages/trac/web/main.py in _open_environment(env_path='/var/trac/projects/foo', run_once=False)
   56     try:
   57         if not env_path in env_cache:
   58             env_cache[env_path] = open_environment(env_path)
   59         env = env_cache[env_path]
   60     finally:
global env_cache = {}, env_path = '/var/trac/projects/foo', global open_environment = <function open_environment>
 /usr/local/lib/python2.4/site-packages/trac/env.py in open_environment(env_path='/var/trac/projects/foo')
  461 
  462     env = Environment(env_path)
  463     if env.needs_upgrade():
  464         raise TracError, 'The Trac Environment needs to be upgraded. Run ' \
  465                          'trac-admin %s upgrade"' % env_path
env = <trac.env.Environment object>, env.needs_upgrade = <bound method Environment.needs_upgrade of <trac.env.Environment object>>
 /usr/local/lib/python2.4/site-packages/trac/env.py in needs_upgrade(self=<trac.env.Environment object>)
  339     def needs_upgrade(self):
  340         """Return whether the environment needs to be upgraded."""
  341         db = self.get_db_cnx()
  342         for participant in self.setup_participants:
  343             if participant.environment_needs_upgrade(db):
db undefined, self = <trac.env.Environment object>, self.get_db_cnx = <bound method Environment.get_db_cnx of <trac.env.Environment object>>
 /usr/local/lib/python2.4/site-packages/trac/env.py in get_db_cnx(self=<trac.env.Environment object>)
  201     def get_db_cnx(self):
  202         """Return a database connection from the connection pool."""
  203         return DatabaseManager(self).get_connection()
  204 
  205     def shutdown(self, tid=None):
global DatabaseManager = <class 'trac.db.api.DatabaseManager'>, self = <trac.env.Environment object>, ).get_connection undefined
 /usr/local/lib/python2.4/site-packages/trac/db/api.py in get_connection(self=<trac.db.api.DatabaseManager object>)
   74             connector, args = self._get_connector()
   75             self._cnx_pool = ConnectionPool(5, connector, **args)
   76         return self._cnx_pool.get_cnx(self.timeout or None)
   77 
   78     def shutdown(self, tid=None):
self = <trac.db.api.DatabaseManager object>, self._cnx_pool = <trac.db.pool.ConnectionPool object>, self._cnx_pool.get_cnx = <bound method ConnectionPool.get_cnx of <trac.db.pool.ConnectionPool object>>, self.timeout = 20, builtin None = None
 /usr/local/lib/python2.4/site-packages/trac/db/pool.py in get_cnx(self=<trac.db.pool.ConnectionPool object>, timeout=20)
   99                         self._cursize -= 1
  100                 elif self._maxsize and self._cursize < self._maxsize:
  101                     cnx = self._connector.get_connection(**self._kwargs)
  102                     self._cursize += 1
  103                     break
cnx undefined, self = <trac.db.pool.ConnectionPool object>, self._connector = <trac.db.sqlite_backend.SQLiteConnector object>, self._connector.get_connection = <bound method SQLiteConnector.get_connection of <trac.db.sqlite_backend.SQLiteConnector object>>, self._kwargs = {'path': u'/var/trac/projects/foo/db/trac.db'}
 /usr/local/lib/python2.4/site-packages/trac/db/sqlite_backend.py in get_connection(self=<trac.db.sqlite_backend.SQLiteConnector object>, path=u'/var/trac/projects/foo/db/trac.db', params={})
  111 
  112     def get_connection(self, path, params={}):
  113         return SQLiteConnection(path, params)
  114 
  115     def init_db(cls, path, params={}):
global SQLiteConnection = <class 'trac.db.sqlite_backend.SQLiteConnection'>, path = u'/var/trac/projects/foo/db/trac.db', params = {}
 /usr/local/lib/python2.4/site-packages/trac/db/sqlite_backend.py in __init__(self=<trac.db.sqlite_backend.SQLiteConnection object>, path=u'/var/trac/projects/foo/db/trac.db', params={})
  138 
  139     def __init__(self, path, params={}):
  140         assert have_pysqlite > 0
  141         self.cnx = None
  142         if path != ':memory:':
global have_pysqlite = 0

AssertionError:
      args = () 

[sfish]

After doing some research in the trac source code I realized that for some reason trac doesn't read the trac.ini. It appeared to me that tracd was ran by the trac user, while lighttpd is ran by the lighttpd user, and since permissions to the trac projects are restricted to trac user only, the lighttpd user wasn't able to read there.

Therefore I suggest that you add some read permission check, so this kind of problems may be resolved faster and without adding unnecessary tickets.

And by the way, thanks for a great project management tool!

[ThurnerRupert]

close as requested …

[Emmanuel Blot]

Replying to ThurnerRupert:

close as requested …

? The author of the ticket has updated the ticket summary to reflect a new need, I don't understand why you closed this ticket.

[ThurnerRupert]

oh .. must have been too bold that one :)

where would you adjust this?

• here: ​http://trac.edgewall.org/browser/trunk/trac/env.py?rev=6006#L297
• or here: ​http://trac.edgewall.org/browser/trunk/trac/config.py?rev=6006#L176

[Emmanuel Blot]

This is a duplicate of #5535.