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#! /usr/bin/env python
#
# Copyright (C) 1998 by the Free Software Foundation, Inc.
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
# Useful for debugging. When an error occurs, this attaches the file name to
# the exception string and re-raises (using the bogus Python 1.5 semantics)
# this may be unnecessary in Python 1.5.2
## realopen = open
## def open(filename, mode='r', bufsize=-1, realopen=realopen):
## try:
## return realopen(filename, mode, bufsize)
## except IOError, e:
## strerror = e.strerror + ': ' + filename
## e.strerror = strerror
## e.args = (e.args[0], strerror)
## # Python 1.5
## import sys
## raise e, None, sys.exc_info()[2]
## # Python 1.5.1
## #raise
## import __builtin__
## __builtin__.__dict__['open'] = open
# This standard driver script is used to run CGI programs, wrapped in code
# that catches errors, and displays them as HTML. This guarantees that
# (almost) any problems in the Mailman software doesn't result in a Web server
# error. It is much more helpful to generate and show a traceback, which the
# user could send to the administrator, than to display a server error and
# have to trudge through server logs.
# Note: this isn't 100% perfect! Here are some things that can go wrong that
# are not caught and reported as traceback-containing HTML:
#
# - This file could contain a syntax error. In that case, you would indeed
# get a Web server error since this file wouldn't even compile, and there's
# no way to catch that.
#
# - The sys module could be royally screwed. Either we couldn't import it, or
# it didn't have a sys.stderr attribute. Both those would indicate serious
# problems in the Python installation. These won't generate Web server
# errors, but neither will they give meaningful tracebacks.
#
# - We couldn't import the traceback module, or traceback.print_exc()
# failed. Same diagnosis and effect as with sys being broken.
#
# I consider all these pretty unlikely. Note that it is also possible that
# the environment variables wouldn't be printed, perhaps because os couldn't
# be imported or there was some problem with os.environ. Again, not likely.
def run_main():
try:
# These will ensure that even if something between now and the
# creation of the real logger below fails, we can still get
# *something* meaningful
logger = sys.stderr
multi = sys.stderr
# insert the relative path to the parent of the Mailman package
# directory, so we can pick up the Utils module
import os
# sys gets imported at module level below
sys.path.insert(0, os.pardir)
# map stderr to a logger, if possible
from Mailman.Logging.StampedLogger import StampedLogger
from Mailman.Logging.MultiLogger import MultiLogger
logger = StampedLogger('error',
label='admin',
manual_reprime=1,
nofail=0)
multi = MultiLogger(sys.__stdout__, logger)
# The name of the module to run is passed in argv[1]. What we
# actually do is import the module named by argv[1] that lives in the
# Mailman.Cgi package. That module must have a main() function, which
# we dig out and call.
#
scriptname = sys.argv[1]
# See the reference manual for why we have to do things this way.
# Note that importing should have no side-effects!
pkg = __import__('Mailman.Cgi', globals(), locals(), [scriptname])
module = getattr(pkg, scriptname)
main = getattr(module, 'main')
try:
main()
except SystemExit:
# this is a valid way for the function to exit
pass
except:
print_traceback(logger, multi)
print_environment(logger)
def print_traceback(logger, multi):
print """\
Content-type: text/html
<p><h3>We're sorry, we hit a bug!</h3>
<p>If you would like to help us identify the problem, please
email a copy of this page to the webmaster for this site with
a description of what happened. Thanks!
<h4>Traceback:</h4>
<p><pre>
"""
logger.write('[----- Traceback ------]\n')
try:
import traceback
# in normal situation, this will get logged to the MultiLogger created
# above, which will write the data to both the real live stdout, and
# the StampedLogger
traceback.print_exc(file=multi)
except:
multi.write('[failed to get a traceback]\n')
print '\n\n</pre>'
def print_environment(logger):
try:
import os
print '''\
<p><hr><h4>Environment variables:</h4>
<p><table>
<tr><td><strong>Variable</strong></td>
<td><strong>Value</strong></td></tr>
'''
logger.write('[----- Environment Variables -----]\n')
for varname, value in os.environ.items():
print '<tr><td>', varname, '</td><td>', value, '</td></tr>'
logger.write('\t%s: %s\n' % (varname, value))
print '</table>'
except:
print '<p><hr>[environment variables are not available]'
try:
import sys
try:
run_main()
finally:
# this is probably not strictly necessary since the script is exiting
# soon anyway
sys.stderr = sys.__stderr__
except:
# Jeez, we couldn't even import sys, or sys didn't have a stderr
# attribute!
print """\
Content-type: text/html
<p><h3>We're sorry, we hit a bug!</h3>
Mailman experienced a very low level failure and could not even generate
a useful traceback. Please report this to the Mailman administrator at
this site.
"""
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