Don't enter an endless loop if remote hg doesn't answer, show remote noise.
The endless loop is not only triggered if the remote shell is too noisy, but
even if the local ssh command dies due to an error.
#!/usr/bin/env python
#
# An example CGI script to use hgweb, edit as necessary
import cgitb, os, sys
cgitb.enable()
# sys.path.insert(0, "/path/to/python/lib") # if not a system-wide install
from mercurial import hgweb
h = hgweb.hgweb("/path/to/repo", "repository name")
h.run()