189
157
if anc_id not in found_ancestors:
190
158
found_ancestors[anc_id] = (anc_order, anc_distance)
191
159
return found_ancestors
194
162
def __get_closest(intersection):
195
163
intersection.sort()
197
165
for entry in intersection:
198
166
if entry[0] == intersection[0][0]:
199
167
matches.append(entry[2])
203
def is_reserved_id(revision_id):
204
"""Determine whether a revision id is reserved
206
:return: True if the revision is reserved, False otherwise
171
def revision_graph(revision, revision_source):
172
"""Produce a graph of the ancestry of the specified revision.
174
:return: root, ancestors map, descendants map
208
return isinstance(revision_id, basestring) and revision_id.endswith(':')
211
def check_not_reserved_id(revision_id):
212
"""Raise ReservedId if the supplied revision_id is reserved"""
213
if is_reserved_id(revision_id):
214
raise errors.ReservedId(revision_id)
217
def ensure_null(revision_id):
218
"""Ensure only NULL_REVISION is used to represent the null revision"""
219
if revision_id is None:
220
symbol_versioning.warn('NULL_REVISION should be used for the null'
221
' revision instead of None, as of bzr 0.91.',
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DeprecationWarning, stacklevel=2)
176
revision_source.lock_read()
178
return _revision_graph(revision, revision_source)
180
revision_source.unlock()
183
def _revision_graph(revision, revision_source):
184
"""See revision_graph."""
185
from bzrlib.tsort import topo_sort
186
graph = revision_source.get_revision_graph(revision)
187
# mark all no-parent revisions as being NULL_REVISION parentage.
188
for node, parents in graph.items():
189
if len(parents) == 0:
190
graph[node] = [NULL_REVISION]
191
# add NULL_REVISION to the graph
192
graph[NULL_REVISION] = []
194
# pick a root. If there are multiple roots
195
# this could pick a random one.
196
topo_order = topo_sort(graph.items())
202
# map the descendants of the graph.
203
# and setup our set based return graph.
204
for node in graph.keys():
205
descendants[node] = {}
206
for node, parents in graph.items():
207
for parent in parents:
208
descendants[parent][node] = 1
209
ancestors[node] = set(parents)
211
assert root not in descendants[root]
212
assert root not in ancestors[root]
213
return root, ancestors, descendants
216
def combined_graph(revision_a, revision_b, revision_source):
217
"""Produce a combined ancestry graph.
218
Return graph root, ancestors map, descendants map, set of common nodes"""
219
root, ancestors, descendants = revision_graph(
220
revision_a, revision_source)
221
root_b, ancestors_b, descendants_b = revision_graph(
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revision_b, revision_source)
224
raise errors.NoCommonRoot(revision_a, revision_b)
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for node, node_anc in ancestors_b.iteritems():
227
if node in ancestors:
230
ancestors[node] = set()
231
ancestors[node].update(node_anc)
232
for node, node_dec in descendants_b.iteritems():
233
if node not in descendants:
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descendants[node] = {}
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descendants[node].update(node_dec)
236
return root, ancestors, descendants, common
239
def common_ancestor(revision_a, revision_b, revision_source,
241
if None in (revision_a, revision_b):
243
if NULL_REVISION in (revision_a, revision_b):
223
244
return NULL_REVISION
228
def is_null(revision_id):
229
if revision_id is None:
230
symbol_versioning.warn('NULL_REVISION should be used for the null'
231
' revision instead of None, as of bzr 0.90.',
232
DeprecationWarning, stacklevel=2)
233
return revision_id in (None, NULL_REVISION)
245
# trivial optimisation
246
if revision_a == revision_b:
250
pb.update('Picking ancestor', 1, 3)
251
graph = revision_source.get_revision_graph_with_ghosts(
252
[revision_a, revision_b])
253
# convert to a NULL_REVISION based graph.
254
ancestors = graph.get_ancestors()
255
descendants = graph.get_descendants()
256
common = set(graph.get_ancestry(revision_a)).intersection(
257
set(graph.get_ancestry(revision_b)))
258
descendants[NULL_REVISION] = {}
259
ancestors[NULL_REVISION] = []
260
for root in graph.roots:
261
descendants[NULL_REVISION][root] = 1
262
ancestors[root].append(NULL_REVISION)
263
for ghost in graph.ghosts:
264
# ghosts act as roots for the purpose of finding
265
# the longest paths from the root: any ghost *might*
266
# be directly attached to the root, so we treat them
268
# ghost now descends from NULL
269
descendants[NULL_REVISION][ghost] = 1
270
# that is it has an ancestor of NULL
271
ancestors[ghost] = [NULL_REVISION]
272
# ghost is common if any of ghosts descendants are common:
273
for ghost_descendant in descendants[ghost]:
274
if ghost_descendant in common:
278
common.add(NULL_REVISION)
279
except errors.NoCommonRoot:
280
raise errors.NoCommonAncestor(revision_a, revision_b)
282
pb.update('Picking ancestor', 2, 3)
283
distances = node_distances (descendants, ancestors, root)
284
pb.update('Picking ancestor', 3, 2)
285
farthest = select_farthest(distances, common)
286
if farthest is None or farthest == NULL_REVISION:
287
raise errors.NoCommonAncestor(revision_a, revision_b)
293
class MultipleRevisionSources(object):
294
"""Proxy that looks in multiple branches for revisions."""
295
def __init__(self, *args):
296
object.__init__(self)
297
assert len(args) != 0
298
self._revision_sources = args
300
def revision_parents(self, revision_id):
301
for source in self._revision_sources:
303
return source.revision_parents(revision_id)
304
except (errors.WeaveRevisionNotPresent, errors.NoSuchRevision), e:
308
def get_revision(self, revision_id):
309
for source in self._revision_sources:
311
return source.get_revision(revision_id)
312
except errors.NoSuchRevision, e:
316
def get_revision_graph(self, revision_id):
317
# we could probe incrementally until the pending
318
# ghosts list stop growing, but its cheaper for now
319
# to just ask for the complete graph for each repository.
321
for source in self._revision_sources:
322
ghost_graph = source.get_revision_graph_with_ghosts()
323
graphs.append(ghost_graph)
326
if not revision_id in graph.get_ancestors():
328
if absent == len(graphs):
329
raise errors.NoSuchRevision(self._revision_sources[0], revision_id)
333
pending = set([revision_id])
334
def find_parents(node_id):
335
"""find the parents for node_id."""
337
ancestors = graph.get_ancestors()
339
return ancestors[node_id]
342
raise errors.NoSuchRevision(self._revision_sources[0], node_id)
344
# all the graphs should have identical parent lists
345
node_id = pending.pop()
347
result[node_id] = find_parents(node_id)
348
for parent_node in result[node_id]:
349
if not parent_node in result:
350
pending.add(parent_node)
351
except errors.NoSuchRevision:
356
def get_revision_graph_with_ghosts(self, revision_ids):
357
# query all the sources for their entire graphs
358
# and then build a combined graph for just
361
for source in self._revision_sources:
362
ghost_graph = source.get_revision_graph_with_ghosts()
363
graphs.append(ghost_graph.get_ancestors())
364
for revision_id in revision_ids:
367
if not revision_id in graph:
369
if absent == len(graphs):
370
raise errors.NoSuchRevision(self._revision_sources[0],
375
pending = set(revision_ids)
377
def find_parents(node_id):
378
"""find the parents for node_id."""
381
return graph[node_id]
384
raise errors.NoSuchRevision(self._revision_sources[0], node_id)
386
# all the graphs should have identical parent lists
387
node_id = pending.pop()
389
parents = find_parents(node_id)
390
for parent_node in parents:
392
if (parent_node not in pending and
393
parent_node not in done):
395
pending.add(parent_node)
396
result.add_node(node_id, parents)
398
except errors.NoSuchRevision:
400
result.add_ghost(node_id)
405
for source in self._revision_sources:
409
for source in self._revision_sources:
413
@deprecated_function(zero_eight)
414
def get_intervening_revisions(ancestor_id, rev_id, rev_source,
415
revision_history=None):
416
"""Find the longest line of descent from maybe_ancestor to revision.
417
Revision history is followed where possible.
419
If ancestor_id == rev_id, list will be empty.
420
Otherwise, rev_id will be the last entry. ancestor_id will never appear.
421
If ancestor_id is not an ancestor, NotAncestor will be thrown
423
root, ancestors, descendants = revision_graph(rev_id, rev_source)
424
if len(descendants) == 0:
425
raise errors.NoSuchRevision(rev_source, rev_id)
426
if ancestor_id not in descendants:
427
rev_source.get_revision(ancestor_id)
428
raise errors.NotAncestor(rev_id, ancestor_id)
429
root_descendants = all_descendants(descendants, ancestor_id)
430
root_descendants.add(ancestor_id)
431
if rev_id not in root_descendants:
432
raise errors.NotAncestor(rev_id, ancestor_id)
433
distances = node_distances(descendants, ancestors, ancestor_id,
434
root_descendants=root_descendants)
436
def best_ancestor(rev_id):
438
for anc_id in ancestors[rev_id]:
440
distance = distances[anc_id]
443
if revision_history is not None and anc_id in revision_history:
445
elif best is None or distance > best[1]:
446
best = (anc_id, distance)
451
while next != ancestor_id:
453
next = best_ancestor(next)