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# Copyright (C) 2005, 2006, 2008 Canonical Ltd
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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"""Copying of history from one branch to another.
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The basic plan is that every branch knows the history of everything
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that has merged into it. As the first step of a merge, pull, or
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branch operation we copy history from the source into the destination
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The copying is done in a slightly complicated order. We don't want to
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add a revision to the store until everything it refers to is also
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stored, so that if a revision is present we can totally recreate it.
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However, we can't know what files are included in a revision until we
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read its inventory. So we query the inventory store of the source for
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the ids we need, and then pull those ids and then return to the inventories.
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import bzrlib.errors as errors
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from bzrlib.errors import InstallFailed
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from bzrlib.progress import ProgressPhase
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from bzrlib.revision import NULL_REVISION
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from bzrlib.tsort import topo_sort
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from bzrlib.trace import mutter
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from bzrlib.versionedfile import FulltextContentFactory
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# TODO: Avoid repeatedly opening weaves so many times.
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# XXX: This doesn't handle ghost (not present in branch) revisions at
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# all yet. I'm not sure they really should be supported.
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# NOTE: This doesn't copy revisions which may be present but not
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# merged into the last revision. I'm not sure we want to do that.
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# - get a list of revisions that need to be pulled in
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# - for each one, pull in that revision file
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# and get the inventory, and store the inventory with right
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# - and get the ancestry, and store that with right parents too
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# - and keep a note of all file ids and version seen
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# - then go through all files; for each one get the weave,
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# and add in all file versions
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class RepoFetcher(object):
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"""Pull revisions and texts from one repository to another.
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if set, try to limit to the data this revision references.
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This should not be used directly, it's essential a object to encapsulate
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the logic in InterRepository.fetch().
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def __init__(self, to_repository, from_repository, last_revision=None,
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pb=None, find_ghosts=True, fetch_spec=None):
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"""Create a repo fetcher.
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:param find_ghosts: If True search the entire history for ghosts.
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:param _write_group_acquired_callable: Don't use; this parameter only
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exists to facilitate a hack done in InterPackRepo.fetch. We would
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like to remove this parameter.
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if to_repository.has_same_location(from_repository):
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# repository.fetch should be taking care of this case.
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raise errors.BzrError('RepoFetcher run '
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'between two objects at the same location: '
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'%r and %r' % (to_repository, from_repository))
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self.to_repository = to_repository
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self.from_repository = from_repository
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self.sink = to_repository._get_sink()
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# must not mutate self._last_revision as its potentially a shared instance
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self._last_revision = last_revision
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self._fetch_spec = fetch_spec
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self.find_ghosts = find_ghosts
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self.pb = bzrlib.ui.ui_factory.nested_progress_bar()
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self.nested_pb = self.pb
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self.from_repository.lock_read()
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if self.nested_pb is not None:
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self.nested_pb.finished()
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self.from_repository.unlock()
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"""Primary worker function.
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This initialises all the needed variables, and then fetches the
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requested revisions, finally clearing the progress bar.
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# Roughly this is what we're aiming for fetch to become:
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# missing = self.sink.insert_stream(self.source.get_stream(search))
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# missing = self.sink.insert_stream(self.source.get_items(missing))
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self.file_ids_names = {}
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pp = ProgressPhase('Transferring', 4, self.pb)
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search = self._revids_to_fetch()
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self._fetch_everything_for_search(search, pp)
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def _fetch_everything_for_search(self, search, pp):
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"""Fetch all data for the given set of revisions."""
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# The first phase is "file". We pass the progress bar for it directly
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# into item_keys_introduced_by, which has more information about how
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# that phase is progressing than we do. Progress updates for the other
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# phases are taken care of in this function.
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# XXX: there should be a clear owner of the progress reporting. Perhaps
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# item_keys_introduced_by should have a richer API than it does at the
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# moment, so that it can feed the progress information back to this
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if (self.from_repository._format.rich_root_data and
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not self.to_repository._format.rich_root_data):
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raise errors.IncompatibleRepositories(
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self.from_repository, self.to_repository,
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"different rich-root support")
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self.pb = bzrlib.ui.ui_factory.nested_progress_bar()
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source = self.from_repository._get_source(
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self.to_repository._format)
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stream = source.get_stream(search)
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from_format = self.from_repository._format
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resume_tokens, missing_keys = self.sink.insert_stream(
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stream, from_format, [])
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stream = source.get_stream_for_missing_keys(missing_keys)
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resume_tokens, missing_keys = self.sink.insert_stream(
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stream, from_format, resume_tokens)
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raise AssertionError(
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"second push failed to complete a fetch %r." % (
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raise AssertionError(
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"second push failed to commit the fetch %r." % (
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if self.pb is not None:
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def _revids_to_fetch(self):
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"""Determines the exact revisions needed from self.from_repository to
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install self._last_revision in self.to_repository.
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If no revisions need to be fetched, then this just returns None.
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if self._fetch_spec is not None:
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return self._fetch_spec
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mutter('fetch up to rev {%s}', self._last_revision)
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if self._last_revision is NULL_REVISION:
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# explicit limit of no revisions needed
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if (self._last_revision is not None and
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self.to_repository.has_revision(self._last_revision)):
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return self.to_repository.search_missing_revision_ids(
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self.from_repository, self._last_revision,
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find_ghosts=self.find_ghosts)
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except errors.NoSuchRevision, e:
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raise InstallFailed([self._last_revision])
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class Inter1and2Helper(object):
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"""Helper for operations that convert data from model 1 and 2
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This is for use by fetchers and converters.
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def __init__(self, source):
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:param source: The repository data comes from
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def iter_rev_trees(self, revs):
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"""Iterate through RevisionTrees efficiently.
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Additionally, the inventory's revision_id is set if unset.
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Trees are retrieved in batches of 100, and then yielded in the order
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:param revs: A list of revision ids
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# In case that revs is not a list.
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for tree in self.source.revision_trees(revs[:100]):
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if tree.inventory.revision_id is None:
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tree.inventory.revision_id = tree.get_revision_id()
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def _find_root_ids(self, revs, parent_map, graph):
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planned_versions = {}
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for tree in self.iter_rev_trees(revs):
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revision_id = tree.inventory.root.revision
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root_id = tree.get_root_id()
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planned_versions.setdefault(root_id, []).append(revision_id)
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revision_root[revision_id] = root_id
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# Find out which parents we don't already know root ids for
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for revision_parents in parent_map.itervalues():
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parents.update(revision_parents)
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parents.difference_update(revision_root.keys() + [NULL_REVISION])
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# Limit to revisions present in the versionedfile
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parents = graph.get_parent_map(parents).keys()
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for tree in self.iter_rev_trees(parents):
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root_id = tree.get_root_id()
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revision_root[tree.get_revision_id()] = root_id
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return revision_root, planned_versions
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def generate_root_texts(self, revs):
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"""Generate VersionedFiles for all root ids.
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:param revs: the revisions to include
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graph = self.source.get_graph()
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parent_map = graph.get_parent_map(revs)
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rev_order = topo_sort(parent_map)
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rev_id_to_root_id, root_id_to_rev_ids = self._find_root_ids(
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revs, parent_map, graph)
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root_id_order = [(rev_id_to_root_id[rev_id], rev_id) for rev_id in
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# Guaranteed stable, this groups all the file id operations together
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# retaining topological order within the revisions of a file id.
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# File id splits and joins would invalidate this, but they don't exist
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# yet, and are unlikely to in non-rich-root environments anyway.
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root_id_order.sort(key=operator.itemgetter(0))
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# Create a record stream containing the roots to create.
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for key in root_id_order:
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root_id, rev_id = key
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rev_parents = parent_map[rev_id]
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# We drop revision parents with different file-ids, because
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# that represents a rename of the root to a different location
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# - its not actually a parent for us. (We could look for that
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# file id in the revision tree at considerably more expense,
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# but for now this is sufficient (and reconcile will catch and
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# correct this anyway).
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# When a parent revision is a ghost, we guess that its root id
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# was unchanged (rather than trimming it from the parent list).
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parent_keys = tuple((root_id, parent) for parent in rev_parents
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if parent != NULL_REVISION and
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rev_id_to_root_id.get(parent, root_id) == root_id)
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yield FulltextContentFactory(key, parent_keys, None, '')
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return [('texts', yield_roots())]
added
removed
bzrlib/fetch.py
