hgext/narrow/narrowrepo.py

rust: Align DirstateEntry internals with Python/C DirstateItem

This propagate to this Rust struct the similar change that was made recently
to the Python classe and C struct. Namely, instead of storing a four-valued
`state` field we now store seven (bit-packed) booleans that give lower-level
information.

Additionally, the marker values -1 and -2 for mtime and size should not
be used internally anymore. They are replaced by some combinations of booleans

For now, all uses of of `DirstateEntry` still use the compatibility APIs
with `state` and marker values. Later the Rust API for DirstateMap
will be increasingly updated to the new style.

Also change the expected result of the test_non_normal_other_parent_entries
unit test. Only a `DirstateEntry` with `size == -2 && mtime != -1` is
affected, but this case never occurs outside of unit tests.
`size == -2` was the marker value for "from other parent" entries,
where no meaningful mtime is stored.

Differential Revision: https://phab.mercurial-scm.org/D11484

# narrowrepo.py - repository which supports narrow revlogs, lazy loading
#
# Copyright 2017 Google, Inc.
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.

from __future__ import absolute_import

from mercurial import wireprototypes

from . import narrowdirstate


def wraprepo(repo):
    """Enables narrow clone functionality on a single local repository."""

    class narrowrepository(repo.__class__):
        def _makedirstate(self):
            dirstate = super(narrowrepository, self)._makedirstate()
            return narrowdirstate.wrapdirstate(self, dirstate)

        def peer(self):
            peer = super(narrowrepository, self).peer()
            peer._caps.add(wireprototypes.NARROWCAP)
            peer._caps.add(wireprototypes.ELLIPSESCAP)
            return peer

    repo.__class__ = narrowrepository