/brz/remove-bazaar

# Copyright (C) 2005, 2006, 2007 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

from bzrlib.lazy_import import lazy_import

lazy_import(globals(), """

from bzrlib import (

    debug,

    )

from bzrlib.store import revision

from bzrlib.store.revision.knit import KnitRevisionStore

""")

from bzrlib import (

    bzrdir,

    deprecated_graph,

    errors,

    knit,

    lockable_files,

    lockdir,

    osutils,

    transactions,

    xml5,

    xml6,

    xml7,

    )

from bzrlib.decorators import needs_read_lock, needs_write_lock

from bzrlib.repository import (

    CommitBuilder,

    MetaDirRepository,

    MetaDirRepositoryFormat,

    RepositoryFormat,

    RootCommitBuilder,

    )

import bzrlib.revision as _mod_revision

from bzrlib.store.versioned import VersionedFileStore

from bzrlib.trace import mutter, mutter_callsite

from bzrlib.util import bencode

class _KnitParentsProvider(object):

    def __init__(self, knit):

        self._knit = knit

    def __repr__(self):

        return 'KnitParentsProvider(%r)' % self._knit

    def get_parents(self, revision_ids):

        parents_list = []

        for revision_id in revision_ids:

            if revision_id == _mod_revision.NULL_REVISION:

                parents = []

            else:

                try:

                    parents = self._knit.get_parents_with_ghosts(revision_id)

                except errors.RevisionNotPresent:

                    parents = None

                else:

                    if len(parents) == 0:

                        parents = [_mod_revision.NULL_REVISION]

            parents_list.append(parents)

        return parents_list

class KnitRepository(MetaDirRepository):

    """Knit format repository."""

    # These attributes are inherited from the Repository base class. Setting

    # them to None ensures that if the constructor is changed to not initialize

    # them, or a subclass fails to call the constructor, that an error will

    # occur rather than the system working but generating incorrect data.

    _commit_builder_class = None

    _serializer = None

    def __init__(self, _format, a_bzrdir, control_files, _revision_store,

        control_store, text_store, _commit_builder_class, _serializer):

        MetaDirRepository.__init__(self, _format, a_bzrdir, control_files,

            _revision_store, control_store, text_store)

        self._commit_builder_class = _commit_builder_class

        self._serializer = _serializer

        self._reconcile_fixes_text_parents = True

    def _warn_if_deprecated(self):

        # This class isn't deprecated

        pass

    def _inventory_add_lines(self, inv_vf, revid, parents, lines, check_content):

        return inv_vf.add_lines_with_ghosts(revid, parents, lines,

            check_content=check_content)[0]

    @needs_read_lock

    def _all_revision_ids(self):

        """See Repository.all_revision_ids()."""

        # Knits get the revision graph from the index of the revision knit, so

        # it's always possible even if they're on an unlistable transport.

        return self._revision_store.all_revision_ids(self.get_transaction())

    def fileid_involved_between_revs(self, from_revid, to_revid):

        """Find file_id(s) which are involved in the changes between revisions.

        This determines the set of revisions which are involved, and then

        finds all file ids affected by those revisions.

        """

        vf = self._get_revision_vf()

        from_set = set(vf.get_ancestry(from_revid))

        to_set = set(vf.get_ancestry(to_revid))

        changed = to_set.difference(from_set)

        return self._fileid_involved_by_set(changed)

    def fileid_involved(self, last_revid=None):

        """Find all file_ids modified in the ancestry of last_revid.

        :param last_revid: If None, last_revision() will be used.

        """

        if not last_revid:

            changed = set(self.all_revision_ids())

        else:

            changed = set(self.get_ancestry(last_revid))

        if None in changed:

            changed.remove(None)

        return self._fileid_involved_by_set(changed)

    @needs_read_lock

    def get_ancestry(self, revision_id, topo_sorted=True):

        """Return a list of revision-ids integrated by a revision.

        This is topologically sorted, unless 'topo_sorted' is specified as

        False.

        """

        if _mod_revision.is_null(revision_id):

            return [None]

        vf = self._get_revision_vf()

        try:

            return [None] + vf.get_ancestry(revision_id, topo_sorted)

        except errors.RevisionNotPresent:

            raise errors.NoSuchRevision(self, revision_id)

    @needs_read_lock

    def get_data_stream(self, revision_ids):

        """See Repository.get_data_stream."""

        item_keys = self.item_keys_introduced_by(revision_ids)

        for knit_kind, file_id, versions in item_keys:

            name = (knit_kind,)

            if knit_kind == 'file':

                name = ('file', file_id)

                knit = self.weave_store.get_weave_or_empty(

                    file_id, self.get_transaction())

            elif knit_kind == 'inventory':

                knit = self.get_inventory_weave()

            elif knit_kind == 'revisions':

                knit = self._revision_store.get_revision_file(

                    self.get_transaction())

            elif knit_kind == 'signatures':

                knit = self._revision_store.get_signature_file(

                    self.get_transaction())

            else:

                raise AssertionError('Unknown knit kind %r' % (knit_kind,))

            yield name, _get_stream_as_bytes(knit, versions)

    @needs_read_lock

    def get_revision(self, revision_id):

        """Return the Revision object for a named revision"""

        revision_id = osutils.safe_revision_id(revision_id)

        return self.get_revision_reconcile(revision_id)

    @needs_read_lock

    def get_revision_graph(self, revision_id=None):

        """Return a dictionary containing the revision graph.

        :param revision_id: The revision_id to get a graph from. If None, then

        the entire revision graph is returned. This is a deprecated mode of

        operation and will be removed in the future.

        :return: a dictionary of revision_id->revision_parents_list.

        """

        if 'evil' in debug.debug_flags:

            mutter_callsite(3,

                "get_revision_graph scales with size of history.")

        # special case NULL_REVISION

        if revision_id == _mod_revision.NULL_REVISION:

            return {}

        a_weave = self._get_revision_vf()

        if revision_id is None:

            return a_weave.get_graph()

        if revision_id not in a_weave:

            raise errors.NoSuchRevision(self, revision_id)

        else:

            # add what can be reached from revision_id

            return a_weave.get_graph([revision_id])

    @needs_read_lock

    def get_revision_graph_with_ghosts(self, revision_ids=None):

        """Return a graph of the revisions with ghosts marked as applicable.

        :param revision_ids: an iterable of revisions to graph or None for all.

        :return: a Graph object with the graph reachable from revision_ids.

        """

        if 'evil' in debug.debug_flags:

            mutter_callsite(3,

                "get_revision_graph_with_ghosts scales with size of history.")

        result = deprecated_graph.Graph()

        vf = self._get_revision_vf()

        versions = set(vf.versions())

        if not revision_ids:

            pending = set(self.all_revision_ids())

            required = set([])

        else:

            pending = set(revision_ids)

            # special case NULL_REVISION

            if _mod_revision.NULL_REVISION in pending:

                pending.remove(_mod_revision.NULL_REVISION)

            required = set(pending)

        done = set([])

        while len(pending):

            revision_id = pending.pop()

            if not revision_id in versions:

                if revision_id in required:

                    raise errors.NoSuchRevision(self, revision_id)

                # a ghost

                result.add_ghost(revision_id)

                # mark it as done so we don't try for it again.

                done.add(revision_id)

                continue

            parent_ids = vf.get_parents_with_ghosts(revision_id)

            for parent_id in parent_ids:

                # is this queued or done ?

                if (parent_id not in pending and

                    parent_id not in done):

                    # no, queue it.

                    pending.add(parent_id)

            result.add_node(revision_id, parent_ids)

            done.add(revision_id)

        return result

    def _get_revision_vf(self):

        """:return: a versioned file containing the revisions."""

        vf = self._revision_store.get_revision_file(self.get_transaction())

        return vf

    def _get_history_vf(self):

        """Get a versionedfile whose history graph reflects all revisions.

        For knit repositories, this is the revision knit.

        """

        return self._get_revision_vf()

    @needs_write_lock

    def reconcile(self, other=None, thorough=False):

        """Reconcile this repository."""

        from bzrlib.reconcile import KnitReconciler

        reconciler = KnitReconciler(self, thorough=thorough)

        reconciler.reconcile()

        return reconciler

    def revision_parents(self, revision_id):

        return self._get_revision_vf().get_parents(revision_id)

    def _make_parents_provider(self):

        return _KnitParentsProvider(self._get_revision_vf())

    def _find_inconsistent_revision_parents(self):

        """Find revisions with different parent lists in the revision object

        and in the index graph.

        :returns: an iterator yielding tuples of (revison-id, parents-in-index,

            parents-in-revision).

        """

        assert self.is_locked()

        vf = self._get_revision_vf()

        for index_version in vf.versions():

            parents_according_to_index = tuple(vf.get_parents_with_ghosts(

                index_version))

            revision = self.get_revision(index_version)

            parents_according_to_revision = tuple(revision.parent_ids)

            if parents_according_to_index != parents_according_to_revision:

                yield (index_version, parents_according_to_index,

                    parents_according_to_revision)

    def _check_for_inconsistent_revision_parents(self):

        inconsistencies = list(self._find_inconsistent_revision_parents())

        if inconsistencies:

            raise errors.BzrCheckError(

                "Revision knit has inconsistent parents.")

    def revision_graph_can_have_wrong_parents(self):

        # The revision.kndx could potentially claim a revision has a different

        # parent to the revision text.

        return True

class RepositoryFormatKnit(MetaDirRepositoryFormat):

    """Bzr repository knit format (generalized). 

    This repository format has:

     - knits for file texts and inventory

     - hash subdirectory based stores.

     - knits for revisions and signatures

     - TextStores for revisions and signatures.

     - a format marker of its own

     - an optional 'shared-storage' flag

     - an optional 'no-working-trees' flag

     - a LockDir lock

    """

    # Set this attribute in derived classes to control the repository class

    # created by open and initialize.

    repository_class = None

    # Set this attribute in derived classes to control the

    # _commit_builder_class that the repository objects will have passed to

    # their constructor.

    _commit_builder_class = None

    # Set this attribute in derived clases to control the _serializer that the

    # repository objects will have passed to their constructor.

    _serializer = xml5.serializer_v5

    # Knit based repositories handle ghosts reasonably well.

    supports_ghosts = True

    def _get_control_store(self, repo_transport, control_files):

        """Return the control store for this repository."""

        return VersionedFileStore(

            repo_transport,

            prefixed=False,

            file_mode=control_files._file_mode,

            versionedfile_class=knit.KnitVersionedFile,

            versionedfile_kwargs={'factory':knit.KnitPlainFactory()},

            )

    def _get_revision_store(self, repo_transport, control_files):

        """See RepositoryFormat._get_revision_store()."""

        versioned_file_store = VersionedFileStore(

            repo_transport,

            file_mode=control_files._file_mode,

            prefixed=False,

            precious=True,

            versionedfile_class=knit.KnitVersionedFile,

            versionedfile_kwargs={'delta':False,

                                  'factory':knit.KnitPlainFactory(),

                                 },

            escaped=True,

            )

        return KnitRevisionStore(versioned_file_store)

    def _get_text_store(self, transport, control_files):

        """See RepositoryFormat._get_text_store()."""

        return self._get_versioned_file_store('knits',

                                  transport,

                                  control_files,

                                  versionedfile_class=knit.KnitVersionedFile,

                                  versionedfile_kwargs={

                                      'create_parent_dir':True,

                                      'delay_create':True,

                                      'dir_mode':control_files._dir_mode,

                                  },

                                  escaped=True)

    def initialize(self, a_bzrdir, shared=False):

        """Create a knit format 1 repository.

        :param a_bzrdir: bzrdir to contain the new repository; must already

            be initialized.

        :param shared: If true the repository will be initialized as a shared

                       repository.

        """

        mutter('creating repository in %s.', a_bzrdir.transport.base)

        dirs = ['knits']

        files = []

        utf8_files = [('format', self.get_format_string())]

        self._upload_blank_content(a_bzrdir, dirs, files, utf8_files, shared)

        repo_transport = a_bzrdir.get_repository_transport(None)

        control_files = lockable_files.LockableFiles(repo_transport,

                                'lock', lockdir.LockDir)

        control_store = self._get_control_store(repo_transport, control_files)

        transaction = transactions.WriteTransaction()

        # trigger a write of the inventory store.

        control_store.get_weave_or_empty('inventory', transaction)

        _revision_store = self._get_revision_store(repo_transport, control_files)

        # the revision id here is irrelevant: it will not be stored, and cannot

        # already exist.

        _revision_store.has_revision_id('A', transaction)

        _revision_store.get_signature_file(transaction)

        return self.open(a_bzrdir=a_bzrdir, _found=True)

    def open(self, a_bzrdir, _found=False, _override_transport=None):

        """See RepositoryFormat.open().

        :param _override_transport: INTERNAL USE ONLY. Allows opening the

                                    repository at a slightly different url

                                    than normal. I.e. during 'upgrade'.

        """

        if not _found:

            format = RepositoryFormat.find_format(a_bzrdir)

            assert format.__class__ ==  self.__class__

        if _override_transport is not None:

            repo_transport = _override_transport

        else:

            repo_transport = a_bzrdir.get_repository_transport(None)

        control_files = lockable_files.LockableFiles(repo_transport,

                                'lock', lockdir.LockDir)

        text_store = self._get_text_store(repo_transport, control_files)

        control_store = self._get_control_store(repo_transport, control_files)

        _revision_store = self._get_revision_store(repo_transport, control_files)

        return self.repository_class(_format=self,

                              a_bzrdir=a_bzrdir,

                              control_files=control_files,

                              _revision_store=_revision_store,

                              control_store=control_store,

                              text_store=text_store,

                              _commit_builder_class=self._commit_builder_class,

                              _serializer=self._serializer)

class RepositoryFormatKnit1(RepositoryFormatKnit):

    """Bzr repository knit format 1.

    This repository format has:

     - knits for file texts and inventory

     - hash subdirectory based stores.

     - knits for revisions and signatures

     - TextStores for revisions and signatures.

     - a format marker of its own

     - an optional 'shared-storage' flag

     - an optional 'no-working-trees' flag

     - a LockDir lock

    This format was introduced in bzr 0.8.

    """

    repository_class = KnitRepository

    _commit_builder_class = CommitBuilder

    _serializer = xml5.serializer_v5

    def __ne__(self, other):

        return self.__class__ is not other.__class__

    def get_format_string(self):

        """See RepositoryFormat.get_format_string()."""

        return "Bazaar-NG Knit Repository Format 1"

    def get_format_description(self):

        """See RepositoryFormat.get_format_description()."""

        return "Knit repository format 1"

    def check_conversion_target(self, target_format):

        pass

class RepositoryFormatKnit3(RepositoryFormatKnit):

    """Bzr repository knit format 3.

    This repository format has:

     - knits for file texts and inventory

     - hash subdirectory based stores.

     - knits for revisions and signatures

     - TextStores for revisions and signatures.

     - a format marker of its own

     - an optional 'shared-storage' flag

     - an optional 'no-working-trees' flag

     - a LockDir lock

     - support for recording full info about the tree root

     - support for recording tree-references

    """

    repository_class = KnitRepository

    _commit_builder_class = RootCommitBuilder

    rich_root_data = True

    supports_tree_reference = True

    _serializer = xml7.serializer_v7

    def _get_matching_bzrdir(self):

        return bzrdir.format_registry.make_bzrdir('dirstate-with-subtree')

    def _ignore_setting_bzrdir(self, format):

        pass

    _matchingbzrdir = property(_get_matching_bzrdir, _ignore_setting_bzrdir)

    def check_conversion_target(self, target_format):

        if not target_format.rich_root_data:

            raise errors.BadConversionTarget(

                'Does not support rich root data.', target_format)

        if not getattr(target_format, 'supports_tree_reference', False):

            raise errors.BadConversionTarget(

                'Does not support nested trees', target_format)

    def get_format_string(self):

        """See RepositoryFormat.get_format_string()."""

        return "Bazaar Knit Repository Format 3 (bzr 0.15)\n"

    def get_format_description(self):

        """See RepositoryFormat.get_format_description()."""

        return "Knit repository format 3"

class RepositoryFormatKnit4(RepositoryFormatKnit):

    """Bzr repository knit format 4.

    This repository format has everything in format 3, except for

    tree-references:

     - knits for file texts and inventory

     - hash subdirectory based stores.

     - knits for revisions and signatures

     - TextStores for revisions and signatures.

     - a format marker of its own

     - an optional 'shared-storage' flag

     - an optional 'no-working-trees' flag

     - a LockDir lock

     - support for recording full info about the tree root

    """

    repository_class = KnitRepository

    _commit_builder_class = RootCommitBuilder

    rich_root_data = True

    supports_tree_reference = False

    _serializer = xml6.serializer_v6

    def _get_matching_bzrdir(self):

        return bzrdir.format_registry.make_bzrdir('rich-root')

    def _ignore_setting_bzrdir(self, format):

        pass

    _matchingbzrdir = property(_get_matching_bzrdir, _ignore_setting_bzrdir)

    def check_conversion_target(self, target_format):

        if not target_format.rich_root_data:

            raise errors.BadConversionTarget(

                'Does not support rich root data.', target_format)

    def get_format_string(self):

        """See RepositoryFormat.get_format_string()."""

        return 'Bazaar Knit Repository Format 4 (bzr 1.0)\n'

    def get_format_description(self):

        """See RepositoryFormat.get_format_description()."""

        return "Knit repository format 4"

def _get_stream_as_bytes(knit, required_versions):

    """Generate a serialised data stream.

    The format is a bencoding of a list.  The first element of the list is a

    string of the format signature, then each subsequent element is a list

    corresponding to a record.  Those lists contain:

      * a version id

      * a list of options

      * a list of parents

      * the bytes

    :returns: a bencoded list.

    """

    knit_stream = knit.get_data_stream(required_versions)

    format_signature, data_list, callable = knit_stream

    data = []

    data.append(format_signature)

    for version, options, length, parents in data_list:

        data.append([version, options, parents, callable(length)])

    return bencode.bencode(data)