localrepo: use file API via vfs while ensuring repository directory
As a part of migration to vfs, this patch invokes some file API
indirectly via vfs, while ensuring repository directory in the
constructor of "localrepository" class.
New file API are added to "scmutil.abstractopener" class, because they
are also used via other derived classes than "scmutil.opener".
But "join()" is not yet defined other than "scmutil.opener" class,
because it should not be used via other opener classes yet.
#!/usr/bin/env python
#
# An example hgweb CGI script, edit as necessary
# See also http://mercurial.selenic.com/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)