~bzr-pqm/bzr/bzr.dev : contents of bzrlib/bundle/serializer/v4.py at revision 6575

~bzr-pqm/bzr/bzr.dev : (revision 6575)
# Copyright (C) 2007-2010 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

from __future__ import absolute_import

from cStringIO import StringIO
import bz2
import re

from bzrlib import (
    errors,
    iterablefile,
    lru_cache,
    multiparent,
    osutils,
    pack,
    revision as _mod_revision,
    serializer,
    trace,
    ui,
    versionedfile as _mod_versionedfile,
    )
from bzrlib.bundle import bundle_data, serializer as bundle_serializer
from bzrlib.i18n import ngettext
from bzrlib import bencode


class _MPDiffInventoryGenerator(_mod_versionedfile._MPDiffGenerator):
    """Generate Inventory diffs serialized inventories."""

    def __init__(self, repo, inventory_keys):
        super(_MPDiffInventoryGenerator, self).__init__(repo.inventories,
            inventory_keys)
        self.repo = repo
        self.sha1s = {}

    def iter_diffs(self):
        """Compute the diffs one at a time."""
        # This is instead of compute_diffs() since we guarantee our ordering of
        # inventories, we don't have to do any buffering
        self._find_needed_keys()
        # We actually use a slightly different ordering. We grab all of the
        # parents first, and then grab the ordered requests.
        needed_ids = [k[-1] for k in self.present_parents]
        needed_ids.extend([k[-1] for k in self.ordered_keys])
        inv_to_str = self.repo._serializer.write_inventory_to_string
        for inv in self.repo.iter_inventories(needed_ids):
            revision_id = inv.revision_id
            key = (revision_id,)
            if key in self.present_parents:
                # Not a key we will transmit, which is a shame, since because
                # of that bundles don't work with stacked branches
                parent_ids = None
            else:
                parent_ids = [k[-1] for k in self.parent_map[key]]
            as_bytes = inv_to_str(inv)
            self._process_one_record(key, (as_bytes,))
            if parent_ids is None:
                continue
            diff = self.diffs.pop(key)
            sha1 = osutils.sha_string(as_bytes)
            yield revision_id, parent_ids, sha1, diff


class BundleWriter(object):
    """Writer for bundle-format files.

    This serves roughly the same purpose as ContainerReader, but acts as a
    layer on top of it.

    Provides ways of writing the specific record types supported this bundle
    format.
    """

    def __init__(self, fileobj):
        self._container = pack.ContainerWriter(self._write_encoded)
        self._fileobj = fileobj
        self._compressor = bz2.BZ2Compressor()

    def _write_encoded(self, bytes):
        """Write bzip2-encoded bytes to the file"""
        self._fileobj.write(self._compressor.compress(bytes))

    def begin(self):
        """Start writing the bundle"""
        self._fileobj.write(bundle_serializer._get_bundle_header(
            bundle_serializer.v4_string))
        self._fileobj.write('#\n')
        self._container.begin()

    def end(self):
        """Finish writing the bundle"""
        self._container.end()
        self._fileobj.write(self._compressor.flush())

    def add_multiparent_record(self, mp_bytes, sha1, parents, repo_kind,
                               revision_id, file_id):
        """Add a record for a multi-parent diff

        :mp_bytes: A multi-parent diff, as a bytestring
        :sha1: The sha1 hash of the fulltext
        :parents: a list of revision-ids of the parents
        :repo_kind: The kind of object in the repository.  May be 'file' or
            'inventory'
        :revision_id: The revision id of the mpdiff being added.
        :file_id: The file-id of the file, or None for inventories.
        """
        metadata = {'parents': parents,
                    'storage_kind': 'mpdiff',
                    'sha1': sha1}
        self._add_record(mp_bytes, metadata, repo_kind, revision_id, file_id)

    def add_fulltext_record(self, bytes, parents, repo_kind, revision_id):
        """Add a record for a fulltext

        :bytes: The fulltext, as a bytestring
        :parents: a list of revision-ids of the parents
        :repo_kind: The kind of object in the repository.  May be 'revision' or
            'signature'
        :revision_id: The revision id of the fulltext being added.
        """
        metadata = {'parents': parents,
                    'storage_kind': 'mpdiff'}
        self._add_record(bytes, {'parents': parents,
            'storage_kind': 'fulltext'}, repo_kind, revision_id, None)

    def add_info_record(self, **kwargs):
        """Add an info record to the bundle

        Any parameters may be supplied, except 'self' and 'storage_kind'.
        Values must be lists, strings, integers, dicts, or a combination.
        """
        kwargs['storage_kind'] = 'header'
        self._add_record(None, kwargs, 'info', None, None)

    @staticmethod
    def encode_name(content_kind, revision_id, file_id=None):
        """Encode semantic ids as a container name"""
        if content_kind not in ('revision', 'file', 'inventory', 'signature',
                'info'):
            raise ValueError(content_kind)
        if content_kind == 'file':
            if file_id is None:
                raise AssertionError()
        else:
            if file_id is not None:
                raise AssertionError()
        if content_kind == 'info':
            if revision_id is not None:
                raise AssertionError()
        elif revision_id is None:
            raise AssertionError()
        names = [n.replace('/', '//') for n in
                 (content_kind, revision_id, file_id) if n is not None]
        return '/'.join(names)

    def _add_record(self, bytes, metadata, repo_kind, revision_id, file_id):
        """Add a bundle record to the container.

        Most bundle records are recorded as header/body pairs, with the
        body being nameless.  Records with storage_kind 'header' have no
        body.
        """
        name = self.encode_name(repo_kind, revision_id, file_id)
        encoded_metadata = bencode.bencode(metadata)
        self._container.add_bytes_record(encoded_metadata, [(name, )])
        if metadata['storage_kind'] != 'header':
            self._container.add_bytes_record(bytes, [])


class BundleReader(object):
    """Reader for bundle-format files.

    This serves roughly the same purpose as ContainerReader, but acts as a
    layer on top of it, providing metadata, a semantic name, and a record
    body
    """

    def __init__(self, fileobj, stream_input=True):
        """Constructor

        :param fileobj: a file containing a bzip-encoded container
        :param stream_input: If True, the BundleReader stream input rather than
            reading it all into memory at once.  Reading it into memory all at
            once is (currently) faster.
        """
        line = fileobj.readline()
        if line != '\n':
            fileobj.readline()
        self.patch_lines = []
        if stream_input:
            source_file = iterablefile.IterableFile(self.iter_decode(fileobj))
        else:
            source_file = StringIO(bz2.decompress(fileobj.read()))
        self._container_file = source_file

    @staticmethod
    def iter_decode(fileobj):
        """Iterate through decoded fragments of the file"""
        decompressor = bz2.BZ2Decompressor()
        for line in fileobj:
            try:
                yield decompressor.decompress(line)
            except EOFError:
                return

    @staticmethod
    def decode_name(name):
        """Decode a name from its container form into a semantic form

        :retval: content_kind, revision_id, file_id
        """
        segments = re.split('(//?)', name)
        names = ['']
        for segment in segments:
            if segment == '//':
                names[-1] += '/'
            elif segment == '/':
                names.append('')
            else:
                names[-1] += segment
        content_kind = names[0]
        revision_id = None
        file_id = None
        if len(names) > 1:
            revision_id = names[1]
        if len(names) > 2:
            file_id = names[2]
        return content_kind, revision_id, file_id

    def iter_records(self):
        """Iterate through bundle records

        :return: a generator of (bytes, metadata, content_kind, revision_id,
            file_id)
        """
        iterator = pack.iter_records_from_file(self._container_file)
        for names, bytes in iterator:
            if len(names) != 1:
                raise errors.BadBundle('Record has %d names instead of 1'
                                       % len(names))
            metadata = bencode.bdecode(bytes)
            if metadata['storage_kind'] == 'header':
                bytes = None
            else:
                _unused, bytes = iterator.next()
            yield (bytes, metadata) + self.decode_name(names[0][0])


class BundleSerializerV4(bundle_serializer.BundleSerializer):
    """Implement the high-level bundle interface"""

    def write(self, repository, revision_ids, forced_bases, fileobj):
        """Write a bundle to a file-like object

        For backwards-compatibility only
        """
        write_op = BundleWriteOperation.from_old_args(repository, revision_ids,
                                                      forced_bases, fileobj)
        return write_op.do_write()

    def write_bundle(self, repository, target, base, fileobj):
        """Write a bundle to a file object

        :param repository: The repository to retrieve revision data from
        :param target: The head revision to include ancestors of
        :param base: The ancestor of the target to stop including acestors
            at.
        :param fileobj: The file-like object to write to
        """
        write_op =  BundleWriteOperation(base, target, repository, fileobj)
        return write_op.do_write()

    def read(self, file):
        """return a reader object for a given file"""
        bundle = BundleInfoV4(file, self)
        return bundle

    @staticmethod
    def get_source_serializer(info):
        """Retrieve the serializer for a given info object"""
        return serializer.format_registry.get(info['serializer'])


class BundleWriteOperation(object):
    """Perform the operation of writing revisions to a bundle"""

    @classmethod
    def from_old_args(cls, repository, revision_ids, forced_bases, fileobj):
        """Create a BundleWriteOperation from old-style arguments"""
        base, target = cls.get_base_target(revision_ids, forced_bases,
                                           repository)
        return BundleWriteOperation(base, target, repository, fileobj,
                                    revision_ids)

    def __init__(self, base, target, repository, fileobj, revision_ids=None):
        self.base = base
        self.target = target
        self.repository = repository
        bundle = BundleWriter(fileobj)
        self.bundle = bundle
        if revision_ids is not None:
            self.revision_ids = revision_ids
        else:
            graph = repository.get_graph()
            revision_ids = graph.find_unique_ancestors(target, [base])
            # Strip ghosts
            parents = graph.get_parent_map(revision_ids)
            self.revision_ids = [r for r in revision_ids if r in parents]
        self.revision_keys = set([(revid,) for revid in self.revision_ids])

    def do_write(self):
        """Write all data to the bundle"""
        trace.note(ngettext('Bundling %d revision.', 'Bundling %d revisions.',
                            len(self.revision_ids)), len(self.revision_ids))
        self.repository.lock_read()
        try:
            self.bundle.begin()
            self.write_info()
            self.write_files()
            self.write_revisions()
            self.bundle.end()
        finally:
            self.repository.unlock()
        return self.revision_ids

    def write_info(self):
        """Write format info"""
        serializer_format = self.repository.get_serializer_format()
        supports_rich_root = {True: 1, False: 0}[
            self.repository.supports_rich_root()]
        self.bundle.add_info_record(serializer=serializer_format,
                                    supports_rich_root=supports_rich_root)

    def write_files(self):
        """Write bundle records for all revisions of all files"""
        text_keys = []
        altered_fileids = self.repository.fileids_altered_by_revision_ids(
                self.revision_ids)
        for file_id, revision_ids in altered_fileids.iteritems():
            for revision_id in revision_ids:
                text_keys.append((file_id, revision_id))
        self._add_mp_records_keys('file', self.repository.texts, text_keys)

    def write_revisions(self):
        """Write bundle records for all revisions and signatures"""
        inv_vf = self.repository.inventories
        topological_order = [key[-1] for key in multiparent.topo_iter_keys(
                                inv_vf, self.revision_keys)]
        revision_order = topological_order
        if self.target is not None and self.target in self.revision_ids:
            # Make sure the target revision is always the last entry
            revision_order = list(topological_order)
            revision_order.remove(self.target)
            revision_order.append(self.target)
        if self.repository._serializer.support_altered_by_hack:
            # Repositories that support_altered_by_hack means that
            # inventories.make_mpdiffs() contains all the data about the tree
            # shape. Formats without support_altered_by_hack require
            # chk_bytes/etc, so we use a different code path.
            self._add_mp_records_keys('inventory', inv_vf,
                                      [(revid,) for revid in topological_order])
        else:
            # Inventories should always be added in pure-topological order, so
            # that we can apply the mpdiff for the child to the parent texts.
            self._add_inventory_mpdiffs_from_serializer(topological_order)
        self._add_revision_texts(revision_order)

    def _add_inventory_mpdiffs_from_serializer(self, revision_order):
        """Generate mpdiffs by serializing inventories.

        The current repository only has part of the tree shape information in
        the 'inventories' vf. So we use serializer.write_inventory_to_string to
        get a 'full' representation of the tree shape, and then generate
        mpdiffs on that data stream. This stream can then be reconstructed on
        the other side.
        """
        inventory_key_order = [(r,) for r in revision_order]
        generator = _MPDiffInventoryGenerator(self.repository,
                                              inventory_key_order)
        for revision_id, parent_ids, sha1, diff in generator.iter_diffs():
            text = ''.join(diff.to_patch())
            self.bundle.add_multiparent_record(text, sha1, parent_ids,
                                               'inventory', revision_id, None)

    def _add_revision_texts(self, revision_order):
        parent_map = self.repository.get_parent_map(revision_order)
        revision_to_str = self.repository._serializer.write_revision_to_string
        revisions = self.repository.get_revisions(revision_order)
        for revision in revisions:
            revision_id = revision.revision_id
            parents = parent_map.get(revision_id, None)
            revision_text = revision_to_str(revision)
            self.bundle.add_fulltext_record(revision_text, parents,
                                       'revision', revision_id)
            try:
                self.bundle.add_fulltext_record(
                    self.repository.get_signature_text(
                    revision_id), parents, 'signature', revision_id)
            except errors.NoSuchRevision:
                pass

    @staticmethod
    def get_base_target(revision_ids, forced_bases, repository):
        """Determine the base and target from old-style revision ids"""
        if len(revision_ids) == 0:
            return None, None
        target = revision_ids[0]
        base = forced_bases.get(target)
        if base is None:
            parents = repository.get_revision(target).parent_ids
            if len(parents) == 0:
                base = _mod_revision.NULL_REVISION
            else:
                base = parents[0]
        return base, target

    def _add_mp_records_keys(self, repo_kind, vf, keys):
        """Add multi-parent diff records to a bundle"""
        ordered_keys = list(multiparent.topo_iter_keys(vf, keys))
        mpdiffs = vf.make_mpdiffs(ordered_keys)
        sha1s = vf.get_sha1s(ordered_keys)
        parent_map = vf.get_parent_map(ordered_keys)
        for mpdiff, item_key, in zip(mpdiffs, ordered_keys):
            sha1 = sha1s[item_key]
            parents = [key[-1] for key in parent_map[item_key]]
            text = ''.join(mpdiff.to_patch())
            # Infer file id records as appropriate.
            if len(item_key) == 2:
                file_id = item_key[0]
            else:
                file_id = None
            self.bundle.add_multiparent_record(text, sha1, parents, repo_kind,
                                               item_key[-1], file_id)


class BundleInfoV4(object):

    """Provide (most of) the BundleInfo interface"""
    def __init__(self, fileobj, serializer):
        self._fileobj = fileobj
        self._serializer = serializer
        self.__real_revisions = None
        self.__revisions = None

    def install(self, repository):
        return self.install_revisions(repository)

    def install_revisions(self, repository, stream_input=True):
        """Install this bundle's revisions into the specified repository

        :param target_repo: The repository to install into
        :param stream_input: If True, will stream input rather than reading it
            all into memory at once.  Reading it into memory all at once is
            (currently) faster.
        """
        repository.lock_write()
        try:
            ri = RevisionInstaller(self.get_bundle_reader(stream_input),
                                   self._serializer, repository)
            return ri.install()
        finally:
            repository.unlock()

    def get_merge_request(self, target_repo):
        """Provide data for performing a merge

        Returns suggested base, suggested target, and patch verification status
        """
        return None, self.target, 'inapplicable'

    def get_bundle_reader(self, stream_input=True):
        """Return a new BundleReader for the associated bundle

        :param stream_input: If True, the BundleReader stream input rather than
            reading it all into memory at once.  Reading it into memory all at
            once is (currently) faster.
        """
        self._fileobj.seek(0)
        return BundleReader(self._fileobj, stream_input)

    def _get_real_revisions(self):
        if self.__real_revisions is None:
            self.__real_revisions = []
            bundle_reader = self.get_bundle_reader()
            for bytes, metadata, repo_kind, revision_id, file_id in \
                bundle_reader.iter_records():
                if repo_kind == 'info':
                    serializer =\
                        self._serializer.get_source_serializer(metadata)
                if repo_kind == 'revision':
                    rev = serializer.read_revision_from_string(bytes)
                    self.__real_revisions.append(rev)
        return self.__real_revisions
    real_revisions = property(_get_real_revisions)

    def _get_revisions(self):
        if self.__revisions is None:
            self.__revisions = []
            for revision in self.real_revisions:
                self.__revisions.append(
                    bundle_data.RevisionInfo.from_revision(revision))
        return self.__revisions

    revisions = property(_get_revisions)

    def _get_target(self):
        return self.revisions[-1].revision_id

    target = property(_get_target)


class RevisionInstaller(object):
    """Installs revisions into a repository"""

    def __init__(self, container, serializer, repository):
        self._container = container
        self._serializer = serializer
        self._repository = repository
        self._info = None

    def install(self):
        """Perform the installation.

        Must be called with the Repository locked.
        """
        self._repository.start_write_group()
        try:
            result = self._install_in_write_group()
        except:
            self._repository.abort_write_group()
            raise
        self._repository.commit_write_group()
        return result

    def _install_in_write_group(self):
        current_file = None
        current_versionedfile = None
        pending_file_records = []
        inventory_vf = None
        pending_inventory_records = []
        added_inv = set()
        target_revision = None
        for bytes, metadata, repo_kind, revision_id, file_id in\
            self._container.iter_records():
            if repo_kind == 'info':
                if self._info is not None:
                    raise AssertionError()
                self._handle_info(metadata)
            if (pending_file_records and
                (repo_kind, file_id) != ('file', current_file)):
                # Flush the data for a single file - prevents memory
                # spiking due to buffering all files in memory.
                self._install_mp_records_keys(self._repository.texts,
                    pending_file_records)
                current_file = None
                del pending_file_records[:]
            if len(pending_inventory_records) > 0 and repo_kind != 'inventory':
                self._install_inventory_records(pending_inventory_records)
                pending_inventory_records = []
            if repo_kind == 'inventory':
                pending_inventory_records.append(((revision_id,), metadata, bytes))
            if repo_kind == 'revision':
                target_revision = revision_id
                self._install_revision(revision_id, metadata, bytes)
            if repo_kind == 'signature':
                self._install_signature(revision_id, metadata, bytes)
            if repo_kind == 'file':
                current_file = file_id
                pending_file_records.append(((file_id, revision_id), metadata, bytes))
        self._install_mp_records_keys(self._repository.texts, pending_file_records)
        return target_revision

    def _handle_info(self, info):
        """Extract data from an info record"""
        self._info = info
        self._source_serializer = self._serializer.get_source_serializer(info)
        if (info['supports_rich_root'] == 0 and
            self._repository.supports_rich_root()):
            self.update_root = True
        else:
            self.update_root = False

    def _install_mp_records(self, versionedfile, records):
        if len(records) == 0:
            return
        d_func = multiparent.MultiParent.from_patch
        vf_records = [(r, m['parents'], m['sha1'], d_func(t)) for r, m, t in
                      records if r not in versionedfile]
        versionedfile.add_mpdiffs(vf_records)

    def _install_mp_records_keys(self, versionedfile, records):
        d_func = multiparent.MultiParent.from_patch
        vf_records = []
        for key, meta, text in records:
            # Adapt to tuple interface: A length two key is a file_id,
            # revision_id pair, a length 1 key is a
            # revision/signature/inventory. We need to do this because
            # the metadata extraction from the bundle has not yet been updated
            # to use the consistent tuple interface itself.
            if len(key) == 2:
                prefix = key[:1]
            else:
                prefix = ()
            parents = [prefix + (parent,) for parent in meta['parents']]
            vf_records.append((key, parents, meta['sha1'], d_func(text)))
        versionedfile.add_mpdiffs(vf_records)

    def _get_parent_inventory_texts(self, inventory_text_cache,
                                    inventory_cache, parent_ids):
        cached_parent_texts = {}
        remaining_parent_ids = []
        for parent_id in parent_ids:
            p_text = inventory_text_cache.get(parent_id, None)
            if p_text is None:
                remaining_parent_ids.append(parent_id)
            else:
                cached_parent_texts[parent_id] = p_text
        ghosts = ()
        # TODO: Use inventory_cache to grab inventories we already have in
        #       memory
        if remaining_parent_ids:
            # first determine what keys are actually present in the local
            # inventories object (don't use revisions as they haven't been
            # installed yet.)
            parent_keys = [(r,) for r in remaining_parent_ids]
            present_parent_map = self._repository.inventories.get_parent_map(
                                        parent_keys)
            present_parent_ids = []
            ghosts = set()
            for p_id in remaining_parent_ids:
                if (p_id,) in present_parent_map:
                    present_parent_ids.append(p_id)
                else:
                    ghosts.add(p_id)
            to_string = self._source_serializer.write_inventory_to_string
            for parent_inv in self._repository.iter_inventories(
                                    present_parent_ids):
                p_text = to_string(parent_inv)
                inventory_cache[parent_inv.revision_id] = parent_inv
                cached_parent_texts[parent_inv.revision_id] = p_text
                inventory_text_cache[parent_inv.revision_id] = p_text

        parent_texts = [cached_parent_texts[parent_id]
                        for parent_id in parent_ids
                         if parent_id not in ghosts]
        return parent_texts

    def _install_inventory_records(self, records):
        if (self._info['serializer'] == self._repository._serializer.format_num
            and self._repository._serializer.support_altered_by_hack):
            return self._install_mp_records_keys(self._repository.inventories,
                records)
        # Use a 10MB text cache, since these are string xml inventories. Note
        # that 10MB is fairly small for large projects (a single inventory can
        # be >5MB). Another possibility is to cache 10-20 inventory texts
        # instead
        inventory_text_cache = lru_cache.LRUSizeCache(10*1024*1024)
        # Also cache the in-memory representation. This allows us to create
        # inventory deltas to apply rather than calling add_inventory from
        # scratch each time.
        inventory_cache = lru_cache.LRUCache(10)
        pb = ui.ui_factory.nested_progress_bar()
        try:
            num_records = len(records)
            for idx, (key, metadata, bytes) in enumerate(records):
                pb.update('installing inventory', idx, num_records)
                revision_id = key[-1]
                parent_ids = metadata['parents']
                # Note: This assumes the local ghosts are identical to the
                #       ghosts in the source, as the Bundle serialization
                #       format doesn't record ghosts.
                p_texts = self._get_parent_inventory_texts(inventory_text_cache,
                                                           inventory_cache,
                                                           parent_ids)
                # Why does to_lines() take strings as the source, it seems that
                # it would have to cast to a list of lines, which we get back
                # as lines and then cast back to a string.
                target_lines = multiparent.MultiParent.from_patch(bytes
                            ).to_lines(p_texts)
                inv_text = ''.join(target_lines)
                del target_lines
                sha1 = osutils.sha_string(inv_text)
                if sha1 != metadata['sha1']:
                    raise errors.BadBundle("Can't convert to target format")
                # Add this to the cache so we don't have to extract it again.
                inventory_text_cache[revision_id] = inv_text
                target_inv = self._source_serializer.read_inventory_from_string(
                    inv_text)
                self._handle_root(target_inv, parent_ids)
                parent_inv = None
                if parent_ids:
                    parent_inv = inventory_cache.get(parent_ids[0], None)
                try:
                    if parent_inv is None:
                        self._repository.add_inventory(revision_id, target_inv,
                                                       parent_ids)
                    else:
                        delta = target_inv._make_delta(parent_inv)
                        self._repository.add_inventory_by_delta(parent_ids[0],
                            delta, revision_id, parent_ids)
                except errors.UnsupportedInventoryKind:
                    raise errors.IncompatibleRevision(repr(self._repository))
                inventory_cache[revision_id] = target_inv
        finally:
            pb.finished()

    def _handle_root(self, target_inv, parent_ids):
        revision_id = target_inv.revision_id
        if self.update_root:
            text_key = (target_inv.root.file_id, revision_id)
            parent_keys = [(target_inv.root.file_id, parent) for
                parent in parent_ids]
            self._repository.texts.add_lines(text_key, parent_keys, [])
        elif not self._repository.supports_rich_root():
            if target_inv.root.revision != revision_id:
                raise errors.IncompatibleRevision(repr(self._repository))

    def _install_revision(self, revision_id, metadata, text):
        if self._repository.has_revision(revision_id):
            return
        revision = self._source_serializer.read_revision_from_string(text)
        self._repository.add_revision(revision.revision_id, revision)

    def _install_signature(self, revision_id, metadata, text):
        transaction = self._repository.get_transaction()
        if self._repository.has_signature_for_revision_id(revision_id):
            return
        self._repository.add_signature_text(revision_id, text)
5374.2.5 by John Arbash Meinel Rework things a bit so the logic can be shared.	1	# Copyright (C) 2007-2010 Canonical Ltd
2520.4.85 by Aaron Bentley Get all test passing (which just proves there aren't enough tests!)	2	#
	3	# This program is free software; you can redistribute it and/or modify
	4	# it under the terms of the GNU General Public License as published by
	5	# the Free Software Foundation; either version 2 of the License, or
	6	# (at your option) any later version.
	7	#
	8	# This program is distributed in the hope that it will be useful,
	9	# but WITHOUT ANY WARRANTY; without even the implied warranty of
	10	# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	11	# GNU General Public License for more details.
	12	#
	13	# You should have received a copy of the GNU General Public License
	14	# along with this program; if not, write to the Free Software
4183.7.1 by Sabin Iacob update FSF mailing address	15	# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
2520.4.85 by Aaron Bentley Get all test passing (which just proves there aren't enough tests!)	16
6379.6.3 by Jelmer Vernooij Use absolute_import.	17	from __future__ import absolute_import
6379.6.3 by Jelmer Vernooij Use absolute_import.	18
2520.4.20 by Aaron Bentley Compress and base64-encode bundle contents	19	from cStringIO import StringIO
2520.4.26 by Aaron Bentley Make decompression reasonably memory-efficient	20	import bz2
2520.4.130 by Aaron Bentley Finish tweaking decode_name	21	import re
2520.4.20 by Aaron Bentley Compress and base64-encode bundle contents	22
2520.4.13 by Aaron Bentley Use real container implementation	23	from bzrlib import (
2520.4.34 by Aaron Bentley Add signature support	24	errors,
2520.4.26 by Aaron Bentley Make decompression reasonably memory-efficient	25	iterablefile,
4543.2.16 by John Arbash Meinel Adding an inventory text cache.	26	lru_cache,
2520.4.13 by Aaron Bentley Use real container implementation	27	multiparent,
2520.4.97 by Aaron Bentley Hack in support for inventory conversion	28	osutils,
2520.4.13 by Aaron Bentley Use real container implementation	29	pack,
2520.4.40 by Aaron Bentley Add human-readable diff to bundles	30	revision as _mod_revision,
4543.2.16 by John Arbash Meinel Adding an inventory text cache.	31	serializer,
2520.4.45 by Aaron Bentley Handle inconsistencies in last-modified-revision between vf and inventory	32	trace,
4543.2.16 by John Arbash Meinel Adding an inventory text cache.	33	ui,
5374.2.5 by John Arbash Meinel Rework things a bit so the logic can be shared.	34	versionedfile as _mod_versionedfile,
2520.4.13 by Aaron Bentley Use real container implementation	35	)
4237.3.1 by Jelmer Vernooij Add new module with generic serializer information; keep XML-specific bits in	36	from bzrlib.bundle import bundle_data, serializer as bundle_serializer
6164.1.1 by Jelmer Vernooij Move file_ids_altered_by to VersionedFileRepository.	37	from bzrlib.i18n import ngettext
2694.5.1 by Alexander Belchenko pyrex bencode (without benchmarks)	38	from bzrlib import bencode
2520.4.14 by Aaron Bentley Get most tests passing, use format header	39
2520.4.4 by Aaron Bentley Get basis support for a new bundle format in place	40