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# Copyright (C) 2005, 2006, 2007, 2009, 2010 Canonical Ltd
#
# 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, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
"""Serializer factory for reading and writing bundles.
"""
from __future__ import absolute_import
import base64
import re
from ... import (
errors,
registry,
)
from ...diff import internal_diff
from ...revision import NULL_REVISION
from ...sixish import (
BytesIO,
)
# For backwards-compatibility
from ...timestamp import unpack_highres_date, format_highres_date
# New bundles should try to use this header format
BUNDLE_HEADER = b'# Bazaar revision bundle v'
BUNDLE_HEADER_RE = re.compile(
br'^# Bazaar revision bundle v(?P<version>\d+[\w.]*)(?P<lineending>\r?)\n$')
CHANGESET_OLD_HEADER_RE = re.compile(
br'^# Bazaar-NG changeset v(?P<version>\d+[\w.]*)(?P<lineending>\r?)\n$')
serializer_registry = registry.Registry()
def _get_bundle_header(version):
return b''.join([BUNDLE_HEADER, version.encode('ascii'), b'\n'])
def _get_filename(f):
return getattr(f, 'name', '<unknown>')
def read_bundle(f):
"""Read in a bundle from a filelike object.
:param f: A file-like object
:return: A list of Bundle objects
"""
version = None
for line in f:
m = BUNDLE_HEADER_RE.match(line)
if m:
if m.group('lineending') != b'':
raise errors.UnsupportedEOLMarker()
version = m.group('version')
break
elif line.startswith(BUNDLE_HEADER):
raise errors.MalformedHeader(
'Extra characters after version number')
m = CHANGESET_OLD_HEADER_RE.match(line)
if m:
version = m.group('version')
raise errors.BundleNotSupported(version,
'old format bundles not supported')
if version is None:
raise errors.NotABundle('Did not find an opening header')
return get_serializer(version.decode('ascii')).read(f)
def get_serializer(version):
try:
serializer = serializer_registry.get(version)
except KeyError:
raise errors.BundleNotSupported(version,
'unknown bundle format')
return serializer(version)
def write(source, revision_ids, f, version=None, forced_bases={}):
"""Serialize a list of bundles to a filelike object.
:param source: A source for revision information
:param revision_ids: The list of revision ids to serialize
:param f: The file to output to
:param version: [optional] target serialization version
"""
with source.lock_read():
return get_serializer(version).write(source, revision_ids,
forced_bases, f)
def write_bundle(repository, revision_id, base_revision_id, out, format=None):
"""Write a bundle of revisions.
:param repository: Repository containing revisions to serialize.
:param revision_id: Head revision_id of the bundle.
:param base_revision_id: Revision assumed to be present in repositories
applying the bundle.
:param out: Output file.
:return: List of revision ids written
"""
with repository.lock_read():
return get_serializer(format).write_bundle(repository, revision_id,
base_revision_id, out)
class BundleSerializer(object):
"""The base class for Serializers.
Common functionality should be included here.
"""
def __init__(self, version):
self.version = version
def read(self, f):
"""Read the rest of the bundles from the supplied file.
:param f: The file to read from
:return: A list of bundle trees
"""
raise NotImplementedError
def write_bundle(self, repository, target, base, fileobj):
"""Write the bundle to the supplied file.
:param repository: The repository to retrieve revision data from
:param target: The revision to provide data for
:param base: The most recent of ancestor of the revision that does not
need to be included in the bundle
:param fileobj: The file to output to
:return: List of revision ids written
"""
raise NotImplementedError
def binary_diff(old_filename, old_lines, new_filename, new_lines, to_file):
temp = BytesIO()
internal_diff(old_filename, old_lines, new_filename, new_lines, temp,
allow_binary=True)
temp.seek(0)
base64.encode(temp, to_file)
to_file.write(b'\n')
serializer_registry.register_lazy('0.8', 'breezy.bundle.serializer.v08', 'BundleSerializerV08')
serializer_registry.register_lazy('0.9', 'breezy.bundle.serializer.v09', 'BundleSerializerV09')
serializer_registry.register_lazy('4', 'breezy.bundle.serializer.v4',
'BundleSerializerV4')
serializer_registry.default_key = '4'
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