180
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"""Return the ancestors of a revision present in a branch.
182
141
It's possible that a branch won't have the complete ancestry of
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one of its revisions.
142
one of its revisions.
186
145
found_ancestors = {}
187
146
anc_iter = enumerate(iter_ancestors(revision_id, revision_source,
188
147
only_present=True))
189
148
for anc_order, (anc_id, anc_distance) in anc_iter:
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if anc_id not in found_ancestors:
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if not found_ancestors.has_key(anc_id):
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150
found_ancestors[anc_id] = (anc_order, anc_distance)
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151
return found_ancestors
195
154
def __get_closest(intersection):
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155
intersection.sort()
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for entry in intersection:
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if entry[0] == intersection[0][0]:
200
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matches.append(entry[2])
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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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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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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)
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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,
233
if None in (revision_a, revision_b):
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# trivial optimisation
236
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()
245
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)))
248
descendants[NULL_REVISION] = {}
249
ancestors[NULL_REVISION] = []
250
for root in graph.roots:
251
descendants[NULL_REVISION][root] = 1
252
ancestors[root].append(NULL_REVISION)
253
if len(graph.roots) == 0:
254
# no reachable roots - not handled yet.
255
raise bzrlib.errors.NoCommonAncestor(revision_a, revision_b)
257
common.add(NULL_REVISION)
258
except bzrlib.errors.NoCommonRoot:
259
raise bzrlib.errors.NoCommonAncestor(revision_a, revision_b)
261
pb.update('Picking ancestor', 2, 3)
262
distances = node_distances (descendants, ancestors, root)
263
pb.update('Picking ancestor', 3, 2)
264
farthest = select_farthest(distances, common)
265
if farthest is None or farthest == NULL_REVISION:
266
raise bzrlib.errors.NoCommonAncestor(revision_a, revision_b)
272
class MultipleRevisionSources(object):
273
"""Proxy that looks in multiple branches for revisions."""
274
def __init__(self, *args):
275
object.__init__(self)
276
assert len(args) != 0
277
self._revision_sources = args
279
def revision_parents(self, revision_id):
280
for source in self._revision_sources:
282
return source.revision_parents(revision_id)
283
except (errors.WeaveRevisionNotPresent, errors.NoSuchRevision), e:
287
def get_revision(self, revision_id):
288
for source in self._revision_sources:
290
return source.get_revision(revision_id)
291
except bzrlib.errors.NoSuchRevision, e:
295
def get_revision_graph(self, revision_id):
296
# we could probe incrementally until the pending
297
# ghosts list stop growing, but its cheaper for now
298
# to just ask for the complete graph for each repository.
300
for source in self._revision_sources:
301
ghost_graph = source.get_revision_graph_with_ghosts()
302
graphs.append(ghost_graph)
305
if not revision_id in graph.get_ancestors():
307
if absent == len(graphs):
308
raise errors.NoSuchRevision(self._revision_sources[0], revision_id)
312
pending = set([revision_id])
313
def find_parents(node_id):
314
"""find the parents for node_id."""
316
ancestors = graph.get_ancestors()
318
return ancestors[node_id]
321
raise errors.NoSuchRevision(self._revision_sources[0], node_id)
323
# all the graphs should have identical parent lists
324
node_id = pending.pop()
326
result[node_id] = find_parents(node_id)
327
for parent_node in result[node_id]:
328
if not parent_node in result:
329
pending.add(parent_node)
330
except errors.NoSuchRevision:
335
def get_revision_graph_with_ghosts(self, revision_ids):
336
# query all the sources for their entire graphs
337
# and then build a combined graph for just
340
for source in self._revision_sources:
341
ghost_graph = source.get_revision_graph_with_ghosts()
342
graphs.append(ghost_graph.get_ancestors())
343
for revision_id in revision_ids:
346
if not revision_id in graph:
348
if absent == len(graphs):
349
raise errors.NoSuchRevision(self._revision_sources[0],
354
pending = set(revision_ids)
356
def find_parents(node_id):
357
"""find the parents for node_id."""
360
return graph[node_id]
363
raise errors.NoSuchRevision(self._revision_sources[0], node_id)
365
# all the graphs should have identical parent lists
366
node_id = pending.pop()
368
parents = find_parents(node_id)
369
for parent_node in parents:
371
if (parent_node not in pending and
372
parent_node not in done):
374
pending.add(parent_node)
375
result.add_node(node_id, parents)
377
except errors.NoSuchRevision:
379
result.add_ghost(node_id)
384
for source in self._revision_sources:
388
for source in self._revision_sources:
392
def get_intervening_revisions(ancestor_id, rev_id, rev_source,
393
revision_history=None):
394
"""Find the longest line of descent from maybe_ancestor to revision.
395
Revision history is followed where possible.
397
If ancestor_id == rev_id, list will be empty.
398
Otherwise, rev_id will be the last entry. ancestor_id will never appear.
399
If ancestor_id is not an ancestor, NotAncestor will be thrown
401
root, ancestors, descendants = revision_graph(rev_id, rev_source)
402
if len(descendants) == 0:
403
raise NoSuchRevision(rev_source, rev_id)
404
if ancestor_id not in descendants:
405
rev_source.get_revision(ancestor_id)
406
raise bzrlib.errors.NotAncestor(rev_id, ancestor_id)
407
root_descendants = all_descendants(descendants, ancestor_id)
408
root_descendants.add(ancestor_id)
409
if rev_id not in root_descendants:
410
raise bzrlib.errors.NotAncestor(rev_id, ancestor_id)
411
distances = node_distances(descendants, ancestors, ancestor_id,
412
root_descendants=root_descendants)
414
def best_ancestor(rev_id):
416
for anc_id in ancestors[rev_id]:
418
distance = distances[anc_id]
421
if revision_history is not None and anc_id in revision_history:
423
elif best is None or distance > best[1]:
424
best = (anc_id, distance)
429
while next != ancestor_id:
431
next = best_ancestor(next)