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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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revision_source.lock_read()
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return _revision_graph(revision, revision_source)
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revision_source.unlock()
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def _revision_graph(revision, revision_source):
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"""See revision_graph."""
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from bzrlib.tsort import topo_sort
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graph = revision_source.get_revision_graph(revision)
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# mark all no-parent revisions as being NULL_REVISION parentage.
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for node, parents in graph.items():
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if len(parents) == 0:
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graph[node] = [NULL_REVISION]
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# add NULL_REVISION to the graph
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graph[NULL_REVISION] = []
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# pick a root. If there are multiple roots
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# this could pick a random one.
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topo_order = topo_sort(graph.items())
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# map the descendants of the graph.
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# and setup our set based return graph.
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for node in graph.keys():
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descendants[node] = {}
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for node, parents in graph.items():
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for parent in parents:
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descendants[parent][node] = 1
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ancestors[node] = set(parents)
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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(
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revision_a, revision_source)
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root_b, ancestors_b, descendants_b = revision_graph(
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revision_b, revision_source)
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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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if None in (revision_a, revision_b):
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# trivial optimisation
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if revision_a == revision_b:
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pb.update('Picking ancestor', 1, 3)
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graph = revision_source.get_revision_graph_with_ghosts(
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[revision_a, revision_b])
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# convert to a NULL_REVISION based graph.
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ancestors = graph.get_ancestors()
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descendants = graph.get_descendants()
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common = set(graph.get_ancestry(revision_a)).intersection(
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set(graph.get_ancestry(revision_b)))
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descendants[NULL_REVISION] = {}
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ancestors[NULL_REVISION] = []
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for root in graph.roots:
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descendants[NULL_REVISION][root] = 1
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ancestors[root].append(NULL_REVISION)
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for ghost in graph.ghosts:
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# ghosts act as roots for the purpose of finding
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# the longest paths from the root: any ghost *might*
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# be directly attached to the root, so we treat them
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# ghost now descends from NULL
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descendants[NULL_REVISION][ghost] = 1
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# that is it has an ancestor of NULL
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ancestors[ghost] = [NULL_REVISION]
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# ghost is common if any of ghosts descendants are common:
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for ghost_descendant in descendants[ghost]:
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if ghost_descendant in common:
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common.add(NULL_REVISION)
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except bzrlib.errors.NoCommonRoot:
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raise bzrlib.errors.NoCommonAncestor(revision_a, revision_b)
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pb.update('Picking ancestor', 2, 3)
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distances = node_distances (descendants, ancestors, root)
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pb.update('Picking ancestor', 3, 2)
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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 revision_parents(self, revision_id):
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for source in self._revision_sources:
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return source.revision_parents(revision_id)
301
except (errors.WeaveRevisionNotPresent, errors.NoSuchRevision), e:
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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)
309
except bzrlib.errors.NoSuchRevision, e:
313
def get_revision_graph(self, revision_id):
314
# we could probe incrementally until the pending
315
# ghosts list stop growing, but its cheaper for now
316
# to just ask for the complete graph for each repository.
318
for source in self._revision_sources:
319
ghost_graph = source.get_revision_graph_with_ghosts()
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graphs.append(ghost_graph)
323
if not revision_id in graph.get_ancestors():
325
if absent == len(graphs):
326
raise errors.NoSuchRevision(self._revision_sources[0], revision_id)
330
pending = set([revision_id])
331
def find_parents(node_id):
332
"""find the parents for node_id."""
334
ancestors = graph.get_ancestors()
336
return ancestors[node_id]
339
raise errors.NoSuchRevision(self._revision_sources[0], node_id)
341
# all the graphs should have identical parent lists
342
node_id = pending.pop()
344
result[node_id] = find_parents(node_id)
345
for parent_node in result[node_id]:
346
if not parent_node in result:
347
pending.add(parent_node)
348
except errors.NoSuchRevision:
353
def get_revision_graph_with_ghosts(self, revision_ids):
354
# query all the sources for their entire graphs
355
# and then build a combined graph for just
358
for source in self._revision_sources:
359
ghost_graph = source.get_revision_graph_with_ghosts()
360
graphs.append(ghost_graph.get_ancestors())
361
for revision_id in revision_ids:
364
if not revision_id in graph:
366
if absent == len(graphs):
367
raise errors.NoSuchRevision(self._revision_sources[0],
372
pending = set(revision_ids)
374
def find_parents(node_id):
375
"""find the parents for node_id."""
378
return graph[node_id]
381
raise errors.NoSuchRevision(self._revision_sources[0], node_id)
383
# all the graphs should have identical parent lists
384
node_id = pending.pop()
386
parents = find_parents(node_id)
387
for parent_node in parents:
389
if (parent_node not in pending and
390
parent_node not in done):
392
pending.add(parent_node)
393
result.add_node(node_id, parents)
395
except errors.NoSuchRevision:
397
result.add_ghost(node_id)
402
for source in self._revision_sources:
406
for source in self._revision_sources:
410
@deprecated_function(zero_eight)
411
def get_intervening_revisions(ancestor_id, rev_id, rev_source,
412
revision_history=None):
413
"""Find the longest line of descent from maybe_ancestor to revision.
414
Revision history is followed where possible.
416
If ancestor_id == rev_id, list will be empty.
417
Otherwise, rev_id will be the last entry. ancestor_id will never appear.
418
If ancestor_id is not an ancestor, NotAncestor will be thrown
420
root, ancestors, descendants = revision_graph(rev_id, rev_source)
421
if len(descendants) == 0:
422
raise NoSuchRevision(rev_source, rev_id)
423
if ancestor_id not in descendants:
424
rev_source.get_revision(ancestor_id)
425
raise bzrlib.errors.NotAncestor(rev_id, ancestor_id)
426
root_descendants = all_descendants(descendants, ancestor_id)
427
root_descendants.add(ancestor_id)
428
if rev_id not in root_descendants:
429
raise bzrlib.errors.NotAncestor(rev_id, ancestor_id)
430
distances = node_distances(descendants, ancestors, ancestor_id,
431
root_descendants=root_descendants)
433
def best_ancestor(rev_id):
435
for anc_id in ancestors[rev_id]:
437
distance = distances[anc_id]
440
if revision_history is not None and anc_id in revision_history:
442
elif best is None or distance > best[1]:
443
best = (anc_id, distance)
448
while next != ancestor_id:
450
next = best_ancestor(next)
171
def is_reserved_id(revision_id):
172
"""Determine whether a revision id is reserved
174
:return: True if the revision is is reserved, False otherwise
176
return isinstance(revision_id, basestring) and revision_id.endswith(':')
179
def check_not_reserved_id(revision_id):
180
"""Raise ReservedId if the supplied revision_id is reserved"""
181
if is_reserved_id(revision_id):
182
raise errors.ReservedId(revision_id)
185
def ensure_null(revision_id):
186
"""Ensure only NULL_REVISION is used to represent the null revision"""
187
if revision_id is None:
188
symbol_versioning.warn('NULL_REVISION should be used for the null'
189
' revision instead of None, as of bzr 0.91.',
190
DeprecationWarning, stacklevel=2)
196
def is_null(revision_id):
197
if revision_id is None:
198
symbol_versioning.warn('NULL_REVISION should be used for the null'
199
' revision instead of None, as of bzr 0.90.',
200
DeprecationWarning, stacklevel=2)
201
return revision_id in (None, NULL_REVISION)