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mergestate: extract overridable methods for making/restoring file backups

In-memory merge currently still uses on-disk mergestate. That's mostly
harmless (I don't think I've seen any problem it's actually
caused). It's still a little weird. I'm planning to add an in-memory
mergestate, which will be used with `overlayworkingctx`. This patch
prepares for that by extracting that logic, so it's easier to change
per subclass.

Differential Revision: https://phab.mercurial-scm.org/D9038

#!/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)