195
146
"""Return the ancestors of a revision present in a branch.
197
148
It's possible that a branch won't have the complete ancestry of
198
one of its revisions.
149
one of its revisions.
201
152
found_ancestors = {}
202
153
anc_iter = enumerate(iter_ancestors(revision_id, revision_source,
203
154
only_present=True))
204
155
for anc_order, (anc_id, anc_distance) in anc_iter:
205
if anc_id not in found_ancestors:
156
if not found_ancestors.has_key(anc_id):
206
157
found_ancestors[anc_id] = (anc_order, anc_distance)
207
158
return found_ancestors
210
161
def __get_closest(intersection):
211
162
intersection.sort()
213
164
for entry in intersection:
214
165
if entry[0] == intersection[0][0]:
215
166
matches.append(entry[2])
219
def is_reserved_id(revision_id):
220
"""Determine whether a revision id is reserved
222
:return: True if the revision is reserved, False otherwise
170
def revision_graph(revision, revision_source):
171
"""Produce a graph of the ancestry of the specified revision.
173
:return: root, ancestors map, descendants map
224
return isinstance(revision_id, basestring) and revision_id.endswith(':')
227
def check_not_reserved_id(revision_id):
228
"""Raise ReservedId if the supplied revision_id is reserved"""
229
if is_reserved_id(revision_id):
230
raise errors.ReservedId(revision_id)
233
def ensure_null(revision_id):
234
"""Ensure only NULL_REVISION is used to represent the null revision"""
235
if revision_id is None:
236
symbol_versioning.warn('NULL_REVISION should be used for the null'
237
' revision instead of None, as of bzr 0.91.',
238
DeprecationWarning, stacklevel=2)
175
revision_source.lock_read()
177
return _revision_graph(revision, revision_source)
179
revision_source.unlock()
182
def _revision_graph(revision, revision_source):
183
"""See revision_graph."""
184
from bzrlib.tsort import topo_sort
185
graph = revision_source.get_revision_graph(revision)
186
# mark all no-parent revisions as being NULL_REVISION parentage.
187
for node, parents in graph.items():
188
if len(parents) == 0:
189
graph[node] = [NULL_REVISION]
190
# add NULL_REVISION to the graph
191
graph[NULL_REVISION] = []
193
# pick a root. If there are multiple roots
194
# this could pick a random one.
195
topo_order = topo_sort(graph.items())
201
# map the descendants of the graph.
202
# and setup our set based return graph.
203
for node in graph.keys():
204
descendants[node] = {}
205
for node, parents in graph.items():
206
for parent in parents:
207
descendants[parent][node] = 1
208
ancestors[node] = set(parents)
210
assert root not in descendants[root]
211
assert root not in ancestors[root]
212
return root, ancestors, descendants
215
def combined_graph(revision_a, revision_b, revision_source):
216
"""Produce a combined ancestry graph.
217
Return graph root, ancestors map, descendants map, set of common nodes"""
218
root, ancestors, descendants = revision_graph(
219
revision_a, revision_source)
220
root_b, ancestors_b, descendants_b = revision_graph(
221
revision_b, revision_source)
223
raise errors.NoCommonRoot(revision_a, revision_b)
225
for node, node_anc in ancestors_b.iteritems():
226
if node in ancestors:
229
ancestors[node] = set()
230
ancestors[node].update(node_anc)
231
for node, node_dec in descendants_b.iteritems():
232
if node not in descendants:
233
descendants[node] = {}
234
descendants[node].update(node_dec)
235
return root, ancestors, descendants, common
238
def common_ancestor(revision_a, revision_b, revision_source,
240
if None in (revision_a, revision_b):
242
if NULL_REVISION in (revision_a, revision_b):
239
243
return NULL_REVISION
244
def is_null(revision_id):
245
if revision_id is None:
246
symbol_versioning.warn('NULL_REVISION should be used for the null'
247
' revision instead of None, as of bzr 0.90.',
248
DeprecationWarning, stacklevel=2)
249
return revision_id in (None, NULL_REVISION)
244
# trivial optimisation
245
if revision_a == revision_b:
249
pb.update('Picking ancestor', 1, 3)
250
graph = revision_source.get_revision_graph_with_ghosts(
251
[revision_a, revision_b])
252
# convert to a NULL_REVISION based graph.
253
ancestors = graph.get_ancestors()
254
descendants = graph.get_descendants()
255
common = set(graph.get_ancestry(revision_a)).intersection(
256
set(graph.get_ancestry(revision_b)))
257
descendants[NULL_REVISION] = {}
258
ancestors[NULL_REVISION] = []
259
for root in graph.roots:
260
descendants[NULL_REVISION][root] = 1
261
ancestors[root].append(NULL_REVISION)
262
for ghost in graph.ghosts:
263
# ghosts act as roots for the purpose of finding
264
# the longest paths from the root: any ghost *might*
265
# be directly attached to the root, so we treat them
267
# ghost now descends from NULL
268
descendants[NULL_REVISION][ghost] = 1
269
# that is it has an ancestor of NULL
270
ancestors[ghost] = [NULL_REVISION]
271
# ghost is common if any of ghosts descendants are common:
272
for ghost_descendant in descendants[ghost]:
273
if ghost_descendant in common:
277
common.add(NULL_REVISION)
278
except errors.NoCommonRoot:
279
raise errors.NoCommonAncestor(revision_a, revision_b)
281
pb.update('Picking ancestor', 2, 3)
282
distances = node_distances (descendants, ancestors, root)
283
pb.update('Picking ancestor', 3, 2)
284
farthest = select_farthest(distances, common)
285
if farthest is None or farthest == NULL_REVISION:
286
raise errors.NoCommonAncestor(revision_a, revision_b)
292
class MultipleRevisionSources(object):
293
"""Proxy that looks in multiple branches for revisions."""
294
def __init__(self, *args):
295
object.__init__(self)
296
assert len(args) != 0
297
self._revision_sources = args
299
def revision_parents(self, revision_id):
300
for source in self._revision_sources:
302
return source.revision_parents(revision_id)
303
except (errors.WeaveRevisionNotPresent, errors.NoSuchRevision), e:
307
def get_revision(self, revision_id):
308
for source in self._revision_sources:
310
return source.get_revision(revision_id)
311
except errors.NoSuchRevision, e:
315
def get_revision_graph(self, revision_id):
316
# we could probe incrementally until the pending
317
# ghosts list stop growing, but its cheaper for now
318
# to just ask for the complete graph for each repository.
320
for source in self._revision_sources:
321
ghost_graph = source.get_revision_graph_with_ghosts()
322
graphs.append(ghost_graph)
325
if not revision_id in graph.get_ancestors():
327
if absent == len(graphs):
328
raise errors.NoSuchRevision(self._revision_sources[0], revision_id)
332
pending = set([revision_id])
333
def find_parents(node_id):
334
"""find the parents for node_id."""
336
ancestors = graph.get_ancestors()
338
return ancestors[node_id]
341
raise errors.NoSuchRevision(self._revision_sources[0], node_id)
343
# all the graphs should have identical parent lists
344
node_id = pending.pop()
346
result[node_id] = find_parents(node_id)
347
for parent_node in result[node_id]:
348
if not parent_node in result:
349
pending.add(parent_node)
350
except errors.NoSuchRevision:
355
def get_revision_graph_with_ghosts(self, revision_ids):
356
# query all the sources for their entire graphs
357
# and then build a combined graph for just
360
for source in self._revision_sources:
361
ghost_graph = source.get_revision_graph_with_ghosts()
362
graphs.append(ghost_graph.get_ancestors())
363
for revision_id in revision_ids:
366
if not revision_id in graph:
368
if absent == len(graphs):
369
raise errors.NoSuchRevision(self._revision_sources[0],
374
pending = set(revision_ids)
376
def find_parents(node_id):
377
"""find the parents for node_id."""
380
return graph[node_id]
383
raise errors.NoSuchRevision(self._revision_sources[0], node_id)
385
# all the graphs should have identical parent lists
386
node_id = pending.pop()
388
parents = find_parents(node_id)
389
for parent_node in parents:
391
if (parent_node not in pending and
392
parent_node not in done):
394
pending.add(parent_node)
395
result.add_node(node_id, parents)
397
except errors.NoSuchRevision:
399
result.add_ghost(node_id)
404
for source in self._revision_sources:
408
for source in self._revision_sources:
412
@deprecated_function(zero_eight)
413
def get_intervening_revisions(ancestor_id, rev_id, rev_source,
414
revision_history=None):
415
"""Find the longest line of descent from maybe_ancestor to revision.
416
Revision history is followed where possible.
418
If ancestor_id == rev_id, list will be empty.
419
Otherwise, rev_id will be the last entry. ancestor_id will never appear.
420
If ancestor_id is not an ancestor, NotAncestor will be thrown
422
root, ancestors, descendants = revision_graph(rev_id, rev_source)
423
if len(descendants) == 0:
424
raise errors.NoSuchRevision(rev_source, rev_id)
425
if ancestor_id not in descendants:
426
rev_source.get_revision(ancestor_id)
427
raise errors.NotAncestor(rev_id, ancestor_id)
428
root_descendants = all_descendants(descendants, ancestor_id)
429
root_descendants.add(ancestor_id)
430
if rev_id not in root_descendants:
431
raise errors.NotAncestor(rev_id, ancestor_id)
432
distances = node_distances(descendants, ancestors, ancestor_id,
433
root_descendants=root_descendants)
435
def best_ancestor(rev_id):
437
for anc_id in ancestors[rev_id]:
439
distance = distances[anc_id]
442
if revision_history is not None and anc_id in revision_history:
444
elif best is None or distance > best[1]:
445
best = (anc_id, distance)
450
while next != ancestor_id:
452
next = best_ancestor(next)