tests: do not use system hg if it does not have "files" command
Ancient hg does not have "hg files" so test-check-*.t will fail with
"unknown command 'files'":
$ hg files
hg: unknown command 'files'
$ hg --version
Mercurial Distributed SCM (version 2.6.2)
Test "hg files" and give up using syshg if it does not have "files" command.
#!/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 = "/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)