view mercurial/pure/__init__.py @ 39605:23f2299e9e53

unionrepo: dynamically create repository type from base repository

This is basically the same thing we just did for bundlerepo except
for union repositories.

.. api::

   ``unionrepo.unionrepository()`` is no longer usable on its own.

   To instantiate an instance, call ``unionrepo.instance()`` or
   ``unionrepo.makeunionrepository()``.

Differential Revision: https://phab.mercurial-scm.org/D4556