rust-index: use interior mutability in head revs and caches
For upcoming changes in `hg-cpython` switching to the `hg-core` index in
ancestors iterators, we will need to avoid excessive mutability, restricting
the use of mutable references on `hg::index::Index` to methods that actually
logically mutate it, whereas the maintenance of caches such as `head_revs`
clearly does not. We illustrate that immediately by switching to immutable
borrows in the corresponding methods of `hg-cpython::MixedIndex`
#!/usr/bin/env python3
#
# 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")
from mercurial import demandimport
demandimport.enable()
from mercurial.hgweb import hgweb, wsgicgi
application = hgweb(config)
wsgicgi.launch(application)