rust-nodemap: input/output primitives
These allow to initiate a `NodeTree` from an immutable opaque
sequence of bytes, which could be passed over from Python
(extracted from a `PyBuffer`) or directly mmapped from a file.
Conversely, we can consume
a `NodeTree`, extracting the bytes that express what
has been added to the immutable part, together with the
original immutable part.
This gives callers the choice to start a new Nodetree.
After writing to disk, some would prefer to reread for
best guarantees (very cheap if mmapping), some others will
find it more convenient to grow the memory that was considered
immutable in the `NodeTree` and continue from there.
This is enough to build examples running on real data and
start gathering performance hints.
Differential Revision: https://phab.mercurial-scm.org/D7796
# -*- coding: utf-8 -*-
# Copyright (C) 2007 Daniel Holth <dholth@fastmail.fm>
# This is a stripped-down version of the original bzr-svn transport.py,
# Copyright (C) 2006 Jelmer Vernooij <jelmer@samba.org>
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
# You should have received a copy of the GNU General Public License
# along with this program; if not, see <http://www.gnu.org/licenses/>.
from __future__ import absolute_import
import svn.client
import svn.core
import svn.ra
Pool = svn.core.Pool
SubversionException = svn.core.SubversionException
from mercurial.pycompat import getattr
from mercurial import util
# Some older versions of the Python bindings need to be
# explicitly initialized. But what we want to do probably
# won't work worth a darn against those libraries anyway!
svn.ra.initialize()
svn_config = None
def _create_auth_baton(pool):
"""Create a Subversion authentication baton. """
import svn.client
# Give the client context baton a suite of authentication
# providers.h
providers = [
svn.client.get_simple_provider(pool),
svn.client.get_username_provider(pool),
svn.client.get_ssl_client_cert_file_provider(pool),
svn.client.get_ssl_client_cert_pw_file_provider(pool),
svn.client.get_ssl_server_trust_file_provider(pool),
]
# Platform-dependent authentication methods
getprovider = getattr(
svn.core, 'svn_auth_get_platform_specific_provider', None
)
if getprovider:
# Available in svn >= 1.6
for name in (b'gnome_keyring', b'keychain', b'kwallet', b'windows'):
for type in (b'simple', b'ssl_client_cert_pw', b'ssl_server_trust'):
p = getprovider(name, type, pool)
if p:
providers.append(p)
else:
if util.safehasattr(svn.client, b'get_windows_simple_provider'):
providers.append(svn.client.get_windows_simple_provider(pool))
return svn.core.svn_auth_open(providers, pool)
class NotBranchError(SubversionException):
pass
class SvnRaTransport(object):
"""
Open an ra connection to a Subversion repository.
"""
def __init__(self, url=b"", ra=None):
self.pool = Pool()
self.svn_url = url
self.username = b''
self.password = b''
# Only Subversion 1.4 has reparent()
if ra is None or not util.safehasattr(svn.ra, b'reparent'):
self.client = svn.client.create_context(self.pool)
ab = _create_auth_baton(self.pool)
self.client.auth_baton = ab
global svn_config
if svn_config is None:
svn_config = svn.core.svn_config_get_config(None)
self.client.config = svn_config
try:
self.ra = svn.client.open_ra_session(
self.svn_url, self.client, self.pool
)
except SubversionException as xxx_todo_changeme:
(inst, num) = xxx_todo_changeme.args
if num in (
svn.core.SVN_ERR_RA_ILLEGAL_URL,
svn.core.SVN_ERR_RA_LOCAL_REPOS_OPEN_FAILED,
svn.core.SVN_ERR_BAD_URL,
):
raise NotBranchError(url)
raise
else:
self.ra = ra
svn.ra.reparent(self.ra, self.svn_url.encode('utf8'))
class Reporter(object):
def __init__(self, reporter_data):
self._reporter, self._baton = reporter_data
def set_path(self, path, revnum, start_empty, lock_token, pool=None):
svn.ra.reporter2_invoke_set_path(
self._reporter,
self._baton,
path,
revnum,
start_empty,
lock_token,
pool,
)
def delete_path(self, path, pool=None):
svn.ra.reporter2_invoke_delete_path(
self._reporter, self._baton, path, pool
)
def link_path(
self, path, url, revision, start_empty, lock_token, pool=None
):
svn.ra.reporter2_invoke_link_path(
self._reporter,
self._baton,
path,
url,
revision,
start_empty,
lock_token,
pool,
)
def finish_report(self, pool=None):
svn.ra.reporter2_invoke_finish_report(
self._reporter, self._baton, pool
)
def abort_report(self, pool=None):
svn.ra.reporter2_invoke_abort_report(
self._reporter, self._baton, pool
)
def do_update(self, revnum, path, *args, **kwargs):
return self.Reporter(
svn.ra.do_update(self.ra, revnum, path, *args, **kwargs)
)