hgweb.cgi

hgweb: compatibility of hgweb.cgi template with Python 3

When running Mercurial on Python 3 hgweb expects the config variable to be a
bytestring.
The solution proposed by Anton Shestakov is to use a byteprefix to the literal
string defined cgi script as provided in this patch for hgweb.cgi,
contrib/hgweb.fcgi and contrib/hgweb.wsgi.
I am not sure whether this covers all relevant templates, but I couldn't find
others.

Differential Revision: https://phab.mercurial-scm.org/D8978

#!/usr/bin/env python
#
# An example hgweb CGI script, edit as necessary
# See also https://mercurial-scm.org/wiki/PublishingRepositories

# Path to repo or hgweb config to serve (see 'hg help hgweb')
config = b"/path/to/repo/or/config"

# Uncomment and adjust if Mercurial is not installed system-wide
# (consult "installed modules" path from 'hg debuginstall'):
# import sys; sys.path.insert(0, "/path/to/python/lib")

# Uncomment to send python tracebacks to the browser if an error occurs:
# import cgitb; cgitb.enable()

from mercurial import demandimport

demandimport.enable()
from mercurial.hgweb import hgweb, wsgicgi

application = hgweb(config)
wsgicgi.launch(application)