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# Copyright (C) 2005-2010 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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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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# TODO: Some kind of command-line display of revision properties:
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# TODO: Some kind of command-line display of revision properties:
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# perhaps show them in log -v and allow them as options to the commit command.
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from bzrlib.graph import node_distances, select_farthest, all_descendants
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from bzrlib.lazy_import import lazy_import
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lazy_import(globals(), """
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from bzrlib import deprecated_graph
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from bzrlib import bugtracker
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from bzrlib.osutils import contains_whitespace
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NULL_REVISION="null:"
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CURRENT_REVISION="current:"
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class Revision(object):
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"""Single revision on a branch.
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and self.message == other.message
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and self.timezone == other.timezone
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and self.committer == other.committer
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and self.properties == other.properties)
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and self.properties == other.properties
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and self.parent_ids == other.parent_ids)
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def __ne__(self, other):
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return not self.__eq__(other)
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def _check_properties(self):
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"""Verify that all revision properties are OK.
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"""Verify that all revision properties are OK."""
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for name, value in self.properties.iteritems():
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if not isinstance(name, basestring) or contains_whitespace(name):
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raise ValueError("invalid property name %r" % name)
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if not isinstance(value, basestring):
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raise ValueError("invalid property value %r for %r" %
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def is_ancestor(revision_id, candidate_id, branch):
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"""Return true if candidate_id is an ancestor of revision_id.
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A false negative will be returned if any intermediate descendent of
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candidate_id is not present in any of the revision_sources.
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revisions_source is an object supporting a get_revision operation that
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behaves like Branch's.
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return candidate_id in branch.get_ancestry(revision_id)
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raise ValueError("invalid property value %r for %r" %
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def get_history(self, repository):
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"""Return the canonical line-of-history for this revision.
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If ghosts are present this may differ in result from a ghost-free
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current_revision = self
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while current_revision is not None:
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reversed_result.append(current_revision.revision_id)
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if not len (current_revision.parent_ids):
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reversed_result.append(None)
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current_revision = None
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next_revision_id = current_revision.parent_ids[0]
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current_revision = repository.get_revision(next_revision_id)
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reversed_result.reverse()
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return reversed_result
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def get_summary(self):
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"""Get the first line of the log message for this revision.
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Return an empty string if message is None.
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return self.message.lstrip().split('\n', 1)[0]
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@symbol_versioning.deprecated_method(symbol_versioning.deprecated_in((1, 13, 0)))
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def get_apparent_author(self):
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"""Return the apparent author of this revision.
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This method is deprecated in favour of get_apparent_authors.
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If the revision properties contain any author names,
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return the first. Otherwise return the committer name.
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authors = self.get_apparent_authors()
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def get_apparent_authors(self):
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"""Return the apparent authors of this revision.
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If the revision properties contain the names of the authors,
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return them. Otherwise return the committer name.
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The return value will be a list containing at least one element.
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authors = self.properties.get('authors', None)
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author = self.properties.get('author', self.committer)
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return authors.split("\n")
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"""Iterate over the bugs associated with this revision."""
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bug_property = self.properties.get('bugs', None)
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if bug_property is None:
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for line in bug_property.splitlines():
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url, status = line.split(None, 2)
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raise errors.InvalidLineInBugsProperty(line)
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if status not in bugtracker.ALLOWED_BUG_STATUSES:
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raise errors.InvalidBugStatus(status)
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def iter_ancestors(revision_id, revision_source, only_present=False):
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"""Return the ancestors of a revision present in a branch.
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It's possible that a branch won't have the complete ancestry of
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one of its revisions.
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one of its revisions.
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found_ancestors = {}
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anc_iter = enumerate(iter_ancestors(revision_id, revision_source,
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only_present=True))
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for anc_order, (anc_id, anc_distance) in anc_iter:
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if not found_ancestors.has_key(anc_id):
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if anc_id not in found_ancestors:
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found_ancestors[anc_id] = (anc_order, anc_distance)
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return found_ancestors
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def __get_closest(intersection):
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intersection.sort()
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for entry in intersection:
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if entry[0] == intersection[0][0]:
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matches.append(entry[2])
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def old_common_ancestor(revision_a, revision_b, revision_source):
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"""Find the ancestor common to both revisions that is closest to both.
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def is_reserved_id(revision_id):
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"""Determine whether a revision id is reserved
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:return: True if the revision is reserved, False otherwise
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from bzrlib.trace import mutter
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a_ancestors = find_present_ancestors(revision_a, revision_source)
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b_ancestors = find_present_ancestors(revision_b, revision_source)
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# a_order is used as a tie-breaker when two equally-good bases are found
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for revision, (a_order, a_distance) in a_ancestors.iteritems():
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if b_ancestors.has_key(revision):
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a_intersection.append((a_distance, a_order, revision))
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b_intersection.append((b_ancestors[revision][1], a_order, revision))
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mutter("a intersection: %r" % a_intersection)
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mutter("b intersection: %r" % b_intersection)
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a_closest = __get_closest(a_intersection)
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if len(a_closest) == 0:
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b_closest = __get_closest(b_intersection)
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assert len(b_closest) != 0
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mutter ("a_closest %r" % a_closest)
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mutter ("b_closest %r" % b_closest)
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if a_closest[0] in b_closest:
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elif b_closest[0] in a_closest:
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return isinstance(revision_id, basestring) and revision_id.endswith(':')
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def check_not_reserved_id(revision_id):
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"""Raise ReservedId if the supplied revision_id is reserved"""
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if is_reserved_id(revision_id):
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raise errors.ReservedId(revision_id)
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def ensure_null(revision_id):
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"""Ensure only NULL_REVISION is used to represent the null revision"""
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if revision_id is None:
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symbol_versioning.warn('NULL_REVISION should be used for the null'
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' revision instead of None, as of bzr 0.91.',
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DeprecationWarning, stacklevel=2)
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raise bzrlib.errors.AmbiguousBase((a_closest[0], b_closest[0]))
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def revision_graph(revision, revision_source):
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"""Produce a graph of the ancestry of the specified revision.
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Return root, ancestors map, descendants map
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TODO: Produce graphs with the NULL revision as root, so that we can find
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a common even when trees are not branches don't represent a single line
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RBC: 20051024: note that when we have two partial histories, this may not
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be possible. But if we are willing to pretend :)... sure.
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descendants[revision] = {}
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while len(lines) > 0:
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if line == NULL_REVISION:
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rev = revision_source.get_revision(line)
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parents = list(rev.parent_ids)
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if len(parents) == 0:
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parents = [NULL_REVISION]
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except bzrlib.errors.NoSuchRevision:
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if parents is not None:
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for parent in parents:
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if parent not in ancestors:
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new_lines.add(parent)
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if parent not in descendants:
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descendants[parent] = {}
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descendants[parent][line] = 1
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if parents is not None:
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ancestors[line] = set(parents)
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# The history for revision becomes inaccessible without
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# actually hitting a no-parents revision. This then
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# makes these asserts below trigger. So, if root is None
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# determine the actual root by walking the accessible tree
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# and then stash NULL_REVISION at the end.
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descendants[root] = {}
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# for every revision, check we can access at least
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# one parent, if we cant, add NULL_REVISION and
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for rev in ancestors:
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if len(ancestors[rev]) == 0:
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raise RuntimeError('unreachable code ?!')
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for parent in ancestors[rev]:
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if parent in ancestors:
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descendants[root][rev] = 1
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ancestors[rev].add(root)
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ancestors[root] = set()
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assert root not in descendants[root]
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assert root not in ancestors[root]
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return root, ancestors, descendants
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def combined_graph(revision_a, revision_b, revision_source):
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"""Produce a combined ancestry graph.
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Return graph root, ancestors map, descendants map, set of common nodes"""
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root, ancestors, descendants = revision_graph(revision_a, revision_source)
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root_b, ancestors_b, descendants_b = revision_graph(revision_b,
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raise bzrlib.errors.NoCommonRoot(revision_a, revision_b)
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for node, node_anc in ancestors_b.iteritems():
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if node in ancestors:
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ancestors[node] = set()
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ancestors[node].update(node_anc)
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for node, node_dec in descendants_b.iteritems():
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if node not in descendants:
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descendants[node] = {}
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descendants[node].update(node_dec)
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return root, ancestors, descendants, common
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def common_ancestor(revision_a, revision_b, revision_source):
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root, ancestors, descendants, common = \
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combined_graph(revision_a, revision_b, revision_source)
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except bzrlib.errors.NoCommonRoot:
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raise bzrlib.errors.NoCommonAncestor(revision_a, revision_b)
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distances = node_distances (descendants, ancestors, root)
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farthest = select_farthest(distances, common)
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if farthest is None or farthest == NULL_REVISION:
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raise bzrlib.errors.NoCommonAncestor(revision_a, revision_b)
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class MultipleRevisionSources(object):
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"""Proxy that looks in multiple branches for revisions."""
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def __init__(self, *args):
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object.__init__(self)
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assert len(args) != 0
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self._revision_sources = args
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def get_revision(self, revision_id):
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for source in self._revision_sources:
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return source.get_revision(revision_id)
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except bzrlib.errors.NoSuchRevision, e:
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def get_intervening_revisions(ancestor_id, rev_id, rev_source,
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revision_history=None):
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"""Find the longest line of descent from maybe_ancestor to revision.
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Revision history is followed where possible.
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If ancestor_id == rev_id, list will be empty.
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Otherwise, rev_id will be the last entry. ancestor_id will never appear.
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If ancestor_id is not an ancestor, NotAncestor will be thrown
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root, ancestors, descendants = revision_graph(rev_id, rev_source)
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if len(descendants) == 0:
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raise NoSuchRevision(rev_source, rev_id)
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if ancestor_id not in descendants:
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rev_source.get_revision(ancestor_id)
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raise bzrlib.errors.NotAncestor(rev_id, ancestor_id)
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root_descendants = all_descendants(descendants, ancestor_id)
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root_descendants.add(ancestor_id)
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if rev_id not in root_descendants:
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raise bzrlib.errors.NotAncestor(rev_id, ancestor_id)
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distances = node_distances(descendants, ancestors, ancestor_id,
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root_descendants=root_descendants)
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def best_ancestor(rev_id):
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for anc_id in ancestors[rev_id]:
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distance = distances[anc_id]
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if revision_history is not None and anc_id in revision_history:
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elif best is None or distance > best[1]:
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best = (anc_id, distance)
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while next != ancestor_id:
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next = best_ancestor(next)
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def is_null(revision_id):
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if revision_id is None:
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symbol_versioning.warn('NULL_REVISION should be used for the null'
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' revision instead of None, as of bzr 0.90.',
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DeprecationWarning, stacklevel=2)
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return revision_id in (None, NULL_REVISION)
added
removed
bzrlib/revision.py
