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# Copyright (C) 2005-2011 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 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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from __future__ import absolute_import
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from bzrlib.lazy_import import lazy_import
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lazy_import(globals(), """
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from bzrlib.i18n import gettext
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from bzrlib.revision import NULL_REVISION
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from bzrlib.trace import mutter
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class RepoFetcher(object):
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"""Pull revisions and texts from one repository to another.
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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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find_ghosts=True, fetch_spec=None):
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"""Create a repo fetcher.
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:param last_revision: If set, try to limit to the data this revision
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:param fetch_spec: A SearchResult specifying which revisions to fetch.
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If set, this overrides last_revision.
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:param find_ghosts: If True search the entire history for ghosts.
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# repository.fetch has the responsibility for short-circuiting
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# attempts to copy between a repository and itself.
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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.from_repository.lock_read()
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mutter("Using fetch logic to copy between %s(%s) and %s(%s)",
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self.from_repository, self.from_repository._format,
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self.to_repository, self.to_repository._format)
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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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pb = ui.ui_factory.nested_progress_bar()
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pb.show_pct = pb.show_count = False
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pb.update(gettext("Finding revisions"), 0, 2)
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search_result = self._revids_to_fetch()
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mutter('fetching: %s', search_result)
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if search_result.is_empty():
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pb.update(gettext("Fetching revisions"), 1, 2)
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self._fetch_everything_for_search(search_result)
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def _fetch_everything_for_search(self, search):
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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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pb = ui.ui_factory.nested_progress_bar()
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pb.update("Get stream source")
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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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pb.update("Inserting stream")
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resume_tokens, missing_keys = self.sink.insert_stream(
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stream, from_format, [])
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pb.update("Missing keys")
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stream = source.get_stream_for_missing_keys(missing_keys)
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pb.update("Inserting 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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pb.update("Finishing stream")
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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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:returns: A SearchResult of some sort. (Possibly a
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PendingAncestryResult, EmptySearchResult, etc.)
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if self._fetch_spec is not None:
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# The fetch spec is already a concrete search result.
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return self._fetch_spec
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elif self._last_revision == NULL_REVISION:
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# fetch_spec is None + last_revision is null => empty fetch.
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# explicit limit of no revisions needed
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return vf_search.EmptySearchResult()
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elif self._last_revision is not None:
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return vf_search.NotInOtherForRevs(self.to_repository,
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self.from_repository, [self._last_revision],
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find_ghosts=self.find_ghosts).execute()
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else: # self._last_revision is None:
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return vf_search.EverythingNotInOther(self.to_repository,
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self.from_repository,
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find_ghosts=self.find_ghosts).execute()
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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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# This is a class variable so that the test suite can override it.
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known_graph_threshold = 100
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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.root_inventory.revision_id is None:
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tree.root_inventory.revision_id = tree.get_revision_id()
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def _find_root_ids(self, revs, parent_map, graph):
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for tree in self.iter_rev_trees(revs):
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root_id = tree.get_root_id()
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revision_id = tree.get_file_revision(root_id, u"")
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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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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 = tsort.topo_sort(parent_map)
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rev_id_to_root_id = self._find_root_ids(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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if len(revs) > self.known_graph_threshold:
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graph = self.source.get_known_graph_ancestry(revs)
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new_roots_stream = _new_root_data_stream(
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root_id_order, rev_id_to_root_id, parent_map, self.source, graph)
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return [('texts', new_roots_stream)]
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def _new_root_data_stream(
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root_keys_to_create, rev_id_to_root_id_map, parent_map, repo, graph=None):
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"""Generate a texts substream of synthesised root entries.
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Used in fetches that do rich-root upgrades.
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:param root_keys_to_create: iterable of (root_id, rev_id) pairs describing
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the root entries to create.
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:param rev_id_to_root_id_map: dict of known rev_id -> root_id mappings for
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calculating the parents. If a parent rev_id is not found here then it
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will be recalculated.
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:param parent_map: a parent map for all the revisions in
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:param graph: a graph to use instead of repo.get_graph().
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for root_key in root_keys_to_create:
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root_id, rev_id = root_key
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parent_keys = _parent_keys_for_root_version(
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root_id, rev_id, rev_id_to_root_id_map, parent_map, repo, graph)
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yield versionedfile.FulltextContentFactory(
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root_key, parent_keys, None, '')
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def _parent_keys_for_root_version(
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root_id, rev_id, rev_id_to_root_id_map, parent_map, repo, graph=None):
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"""Get the parent keys for a given root id.
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A helper function for _new_root_data_stream.
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# Include direct parents of the revision, but only if they used the same
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# root_id and are heads.
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rev_parents = parent_map[rev_id]
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for parent_id in rev_parents:
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if parent_id == NULL_REVISION:
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if parent_id not in rev_id_to_root_id_map:
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# We probably didn't read this revision, go spend the extra effort
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tree = repo.revision_tree(parent_id)
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except errors.NoSuchRevision:
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# Ghost, fill out rev_id_to_root_id in case we encounter this
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# But set parent_root_id to None since we don't really know
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parent_root_id = None
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parent_root_id = tree.get_root_id()
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rev_id_to_root_id_map[parent_id] = None
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# rev_id_to_root_id_map[parent_id] = parent_root_id
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# memory consumption maybe?
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parent_root_id = rev_id_to_root_id_map[parent_id]
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if root_id == parent_root_id:
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# With stacking we _might_ want to refer to a non-local revision,
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# but this code path only applies when we have the full content
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# available, so ghosts really are ghosts, not just the edge of
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parent_ids.append(parent_id)
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# root_id may be in the parent anyway.
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tree = repo.revision_tree(parent_id)
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except errors.NoSuchRevision:
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# ghost, can't refer to it.
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parent_ids.append(tree.get_file_revision(root_id))
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except errors.NoSuchId:
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# Drop non-head parents
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graph = repo.get_graph()
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heads = graph.heads(parent_ids)
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for parent_id in parent_ids:
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if parent_id in heads and parent_id not in selected_ids:
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selected_ids.append(parent_id)
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parent_keys = [(root_id, parent_id) for parent_id in selected_ids]
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class TargetRepoKinds(object):
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"""An enum-like set of constants.
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They are the possible values of FetchSpecFactory.target_repo_kinds.
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PREEXISTING = 'preexisting'
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class FetchSpecFactory(object):
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"""A helper for building the best fetch spec for a sprout call.
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Factors that go into determining the sort of fetch to perform:
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* did the caller specify any revision IDs?
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* did the caller specify a source branch (need to fetch its
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heads_to_fetch(), usually the tip + tags)
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* is there an existing target repo (don't need to refetch revs it
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* target is stacked? (similar to pre-existing target repo: even if
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the target itself is new don't want to refetch existing revs)
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:ivar source_branch: the source branch if one specified, else None.
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:ivar source_branch_stop_revision_id: fetch up to this revision of
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source_branch, rather than its tip.
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:ivar source_repo: the source repository if one found, else None.
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:ivar target_repo: the target repository acquired by sprout.
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:ivar target_repo_kind: one of the TargetRepoKinds constants.
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self._explicit_rev_ids = set()
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self.source_branch = None
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self.source_branch_stop_revision_id = None
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self.source_repo = None
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self.target_repo = None
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self.target_repo_kind = None
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def add_revision_ids(self, revision_ids):
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"""Add revision_ids to the set of revision_ids to be fetched."""
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self._explicit_rev_ids.update(revision_ids)
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def make_fetch_spec(self):
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"""Build a SearchResult or PendingAncestryResult or etc."""
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if self.target_repo_kind is None or self.source_repo is None:
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raise AssertionError(
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'Incomplete FetchSpecFactory: %r' % (self.__dict__,))
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if len(self._explicit_rev_ids) == 0 and self.source_branch is None:
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if self.limit is not None:
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raise NotImplementedError(
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"limit is only supported with a source branch set")
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# Caller hasn't specified any revisions or source branch
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if self.target_repo_kind == TargetRepoKinds.EMPTY:
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return vf_search.EverythingResult(self.source_repo)
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# We want everything not already in the target (or target's
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return vf_search.EverythingNotInOther(
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self.target_repo, self.source_repo).execute()
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heads_to_fetch = set(self._explicit_rev_ids)
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if self.source_branch is not None:
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must_fetch, if_present_fetch = self.source_branch.heads_to_fetch()
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if self.source_branch_stop_revision_id is not None:
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# Replace the tip rev from must_fetch with the stop revision
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# XXX: this might be wrong if the tip rev is also in the
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# must_fetch set for other reasons (e.g. it's the tip of
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# multiple loom threads?), but then it's pretty unclear what it
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# should mean to specify a stop_revision in that case anyway.
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must_fetch.discard(self.source_branch.last_revision())
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must_fetch.add(self.source_branch_stop_revision_id)
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heads_to_fetch.update(must_fetch)
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if_present_fetch = set()
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if self.target_repo_kind == TargetRepoKinds.EMPTY:
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# PendingAncestryResult does not raise errors if a requested head
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# is absent. Ideally it would support the
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# required_ids/if_present_ids distinction, but in practice
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# heads_to_fetch will almost certainly be present so this doesn't
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all_heads = heads_to_fetch.union(if_present_fetch)
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ret = vf_search.PendingAncestryResult(all_heads, self.source_repo)
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if self.limit is not None:
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graph = self.source_repo.get_graph()
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topo_order = list(graph.iter_topo_order(ret.get_keys()))
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result_set = topo_order[:self.limit]
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ret = self.source_repo.revision_ids_to_search_result(result_set)
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return vf_search.NotInOtherForRevs(self.target_repo, self.source_repo,
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required_ids=heads_to_fetch, if_present_ids=if_present_fetch,
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limit=self.limit).execute()
added
removed
bzrlib/fetch.py
