188
169
if anc_id not in found_ancestors:
189
170
found_ancestors[anc_id] = (anc_order, anc_distance)
190
171
return found_ancestors
193
174
def __get_closest(intersection):
194
175
intersection.sort()
196
177
for entry in intersection:
197
178
if entry[0] == intersection[0][0]:
198
179
matches.append(entry[2])
183
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()
195
def _revision_graph(revision, revision_source):
196
"""See revision_graph."""
197
from bzrlib.tsort import topo_sort
198
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():
201
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 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
251
def common_ancestor(revision_a, revision_b, revision_source,
253
if None in (revision_a, revision_b):
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if NULL_REVISION 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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# Shortcut the case where one of the tips is already included in
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# the other graphs ancestry.
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ancestry_a = graph.get_ancestry(revision_a, topo_sorted=False)
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if revision_b in ancestry_a:
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ancestry_b = graph.get_ancestry(revision_b, topo_sorted=False)
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if revision_a in ancestry_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(ancestry_a)
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common.intersection_update(ancestry_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
282
ancestors[root].append(NULL_REVISION)
283
for ghost in graph.ghosts:
284
# ghosts act as roots for the purpose of finding
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# the longest paths from the root: any ghost *might*
286
# be directly attached to the root, so we treat them
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# ghost now descends from NULL
289
descendants[NULL_REVISION][ghost] = 1
290
# that is it has an ancestor of NULL
291
ancestors[ghost] = [NULL_REVISION]
292
# ghost is common if any of ghosts descendants are common:
293
for ghost_descendant in descendants[ghost]:
294
if ghost_descendant in common:
298
common.add(NULL_REVISION)
299
except errors.NoCommonRoot:
300
raise errors.NoCommonAncestor(revision_a, revision_b)
302
pb.update('Picking ancestor', 2, 3)
303
distances = node_distances (descendants, ancestors, root)
304
pb.update('Picking ancestor', 3, 2)
305
farthest = select_farthest(distances, common)
306
if farthest is None or farthest == NULL_REVISION:
307
raise errors.NoCommonAncestor(revision_a, revision_b)
313
class MultipleRevisionSources(object):
314
"""Proxy that looks in multiple branches for revisions."""
315
def __init__(self, *args):
316
object.__init__(self)
317
assert len(args) != 0
318
self._revision_sources = args
320
def revision_parents(self, revision_id):
321
for source in self._revision_sources:
323
return source.revision_parents(revision_id)
324
except (errors.WeaveRevisionNotPresent, errors.NoSuchRevision), e:
328
def get_revision(self, revision_id):
329
for source in self._revision_sources:
331
return source.get_revision(revision_id)
332
except errors.NoSuchRevision, e:
336
def get_revision_graph(self, revision_id):
337
# we could probe incrementally until the pending
338
# ghosts list stop growing, but its cheaper for now
339
# to just ask for the complete graph for each repository.
341
for source in self._revision_sources:
342
ghost_graph = source.get_revision_graph_with_ghosts()
343
graphs.append(ghost_graph)
346
if not revision_id in graph.get_ancestors():
348
if absent == len(graphs):
349
raise errors.NoSuchRevision(self._revision_sources[0], revision_id)
353
pending = set([revision_id])
354
def find_parents(node_id):
355
"""find the parents for node_id."""
357
ancestors = graph.get_ancestors()
359
return ancestors[node_id]
362
raise errors.NoSuchRevision(self._revision_sources[0], node_id)
364
# all the graphs should have identical parent lists
365
node_id = pending.pop()
367
result[node_id] = find_parents(node_id)
368
for parent_node in result[node_id]:
369
if not parent_node in result:
370
pending.add(parent_node)
371
except errors.NoSuchRevision:
376
def get_revision_graph_with_ghosts(self, revision_ids):
377
# query all the sources for their entire graphs
378
# and then build a combined graph for just
381
for source in self._revision_sources:
382
ghost_graph = source.get_revision_graph_with_ghosts()
383
graphs.append(ghost_graph.get_ancestors())
384
for revision_id in revision_ids:
387
if not revision_id in graph:
389
if absent == len(graphs):
390
raise errors.NoSuchRevision(self._revision_sources[0],
395
pending = set(revision_ids)
397
def find_parents(node_id):
398
"""find the parents for node_id."""
401
return graph[node_id]
404
raise errors.NoSuchRevision(self._revision_sources[0], node_id)
406
# all the graphs should have identical parent lists
407
node_id = pending.pop()
409
parents = find_parents(node_id)
410
for parent_node in parents:
412
if (parent_node not in pending and
413
parent_node not in done):
415
pending.add(parent_node)
416
result.add_node(node_id, parents)
418
except errors.NoSuchRevision:
420
result.add_ghost(node_id)
425
for source in self._revision_sources:
429
for source in self._revision_sources:
433
@deprecated_function(zero_eight)
434
def get_intervening_revisions(ancestor_id, rev_id, rev_source,
435
revision_history=None):
436
"""Find the longest line of descent from maybe_ancestor to revision.
437
Revision history is followed where possible.
439
If ancestor_id == rev_id, list will be empty.
440
Otherwise, rev_id will be the last entry. ancestor_id will never appear.
441
If ancestor_id is not an ancestor, NotAncestor will be thrown
443
root, ancestors, descendants = revision_graph(rev_id, rev_source)
444
if len(descendants) == 0:
445
raise errors.NoSuchRevision(rev_source, rev_id)
446
if ancestor_id not in descendants:
447
rev_source.get_revision(ancestor_id)
448
raise errors.NotAncestor(rev_id, ancestor_id)
449
root_descendants = all_descendants(descendants, ancestor_id)
450
root_descendants.add(ancestor_id)
451
if rev_id not in root_descendants:
452
raise errors.NotAncestor(rev_id, ancestor_id)
453
distances = node_distances(descendants, ancestors, ancestor_id,
454
root_descendants=root_descendants)
456
def best_ancestor(rev_id):
458
for anc_id in ancestors[rev_id]:
460
distance = distances[anc_id]
463
if revision_history is not None and anc_id in revision_history:
465
elif best is None or distance > best[1]:
466
best = (anc_id, distance)
471
while next != ancestor_id:
473
next = best_ancestor(next)
202
478
def is_reserved_id(revision_id):
203
479
"""Determine whether a revision id is reserved
205
:return: True if the revision is reserved, False otherwise
481
:return: True if the revision is is reserved, False otherwise
207
483
return isinstance(revision_id, basestring) and revision_id.endswith(':')