rust: Update the memmap2 crate to version 0.4.0
This version:
* Optionally implements the `StableDeref` trait, removing the need
for a wrapper type doing that
* Adds support for mapping empty files, which can routinely happen
for dirstate-v2 data files. This was a cause of some failing tests
when running with `run-tests.py --rhg --extra-config-opt rhg.status=1`
Differential Revision: https://phab.mercurial-scm.org/D11446
# Copyright 2010-2011 Fog Creek Software
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.
'''largefile store working over Mercurial's wire protocol'''
from __future__ import absolute_import
from . import (
lfutil,
remotestore,
)
class wirestore(remotestore.remotestore):
def __init__(self, ui, repo, remote):
cap = remote.capable(b'largefiles')
if not cap:
raise lfutil.storeprotonotcapable([])
storetypes = cap.split(b',')
if b'serve' not in storetypes:
raise lfutil.storeprotonotcapable(storetypes)
self.remote = remote
super(wirestore, self).__init__(ui, repo, remote.url())
def _put(self, hash, fd):
return self.remote.putlfile(hash, fd)
def _get(self, hash):
return self.remote.getlfile(hash)
def _stat(self, hashes):
"""For each hash, return 0 if it is available, other values if not.
It is usually 2 if the largefile is missing, but might be 1 the server
has a corrupted copy."""
with self.remote.commandexecutor() as e:
fs = []
for hash in hashes:
fs.append(
(
hash,
e.callcommand(
b'statlfile',
{
b'sha': hash,
},
),
)
)
return {hash: f.result() for hash, f in fs}