Tests if hgweb can run without touching sys.stdin, as is required

by the WSGI standard and strictly implemented by mod_wsgi.

  $ mkdir repo

  $ cd repo

  $ hg init

  $ echo foo > bar

  $ hg add bar

  $ hg commit -m "test"

  $ cat > request.py <<EOF

  > from mercurial import dispatch

  > from mercurial.hgweb.hgweb_mod import hgweb

  > from mercurial.ui import ui

  > from mercurial import hg

  > from StringIO import StringIO

  > import os, sys

  > 

  > class FileLike(object):

  >     def __init__(self, real):

  >         self.real = real

  >     def fileno(self):

  >         print >> sys.__stdout__, 'FILENO'

  >         return self.real.fileno()

  >     def read(self):

  >         print >> sys.__stdout__, 'READ'

  >         return self.real.read()

  >     def readline(self):

  >         print >> sys.__stdout__, 'READLINE'

  >         return self.real.readline()

  > 

  > sys.stdin = FileLike(sys.stdin)

  > errors = StringIO()

  > input = StringIO()

  > output = StringIO()

  > 

  > def startrsp(status, headers):

  > 

  > env = {

  > }

  > 

  > i = hgweb('.')

  > i(env, startrsp)

  > print '---- ERRORS'

  > print errors.getvalue()

  > print '---- OS.ENVIRON wsgi variables'

  > print sorted([x for x in os.environ if x.startswith('wsgi')])

  > print '---- request.ENVIRON wsgi variables'

  > print sorted([x for x in i.repo.ui.environ if x.startswith('wsgi')])

  > EOF

  $ python request.py

  ---- STATUS

  200 Script output follows

  ---- HEADERS

  [('Content-Type', 'text/html; charset=ascii')]

  ---- DATA

  ---- ERRORS

  ---- OS.ENVIRON wsgi variables

  []

  ---- request.ENVIRON wsgi variables

  ['wsgi.errors', 'wsgi.input', 'wsgi.multiprocess', 'wsgi.multithread', 'wsgi.run_once', 'wsgi.url_scheme', 'wsgi.version']