171
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 is reserved, False otherwise
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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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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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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*
257
# 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
262
ancestors[ghost] = [NULL_REVISION]
263
# ghost is common if any of ghosts descendants are common:
264
for ghost_descendant in descendants[ghost]:
265
if ghost_descendant in common:
269
common.add(NULL_REVISION)
270
except bzrlib.errors.NoCommonRoot:
271
raise bzrlib.errors.NoCommonAncestor(revision_a, revision_b)
273
pb.update('Picking ancestor', 2, 3)
274
distances = node_distances (descendants, ancestors, root)
275
pb.update('Picking ancestor', 3, 2)
276
farthest = select_farthest(distances, common)
277
if farthest is None or farthest == NULL_REVISION:
278
raise bzrlib.errors.NoCommonAncestor(revision_a, revision_b)
284
class MultipleRevisionSources(object):
285
"""Proxy that looks in multiple branches for revisions."""
286
def __init__(self, *args):
287
object.__init__(self)
288
assert len(args) != 0
289
self._revision_sources = args
291
def revision_parents(self, revision_id):
292
for source in self._revision_sources:
294
return source.revision_parents(revision_id)
295
except (errors.WeaveRevisionNotPresent, errors.NoSuchRevision), e:
299
def get_revision(self, revision_id):
300
for source in self._revision_sources:
302
return source.get_revision(revision_id)
303
except bzrlib.errors.NoSuchRevision, e:
307
def get_revision_graph(self, revision_id):
308
# we could probe incrementally until the pending
309
# ghosts list stop growing, but its cheaper for now
310
# to just ask for the complete graph for each repository.
312
for source in self._revision_sources:
313
ghost_graph = source.get_revision_graph_with_ghosts()
314
graphs.append(ghost_graph)
317
if not revision_id in graph.get_ancestors():
319
if absent == len(graphs):
320
raise errors.NoSuchRevision(self._revision_sources[0], revision_id)
324
pending = set([revision_id])
325
def find_parents(node_id):
326
"""find the parents for node_id."""
328
ancestors = graph.get_ancestors()
330
return ancestors[node_id]
333
raise errors.NoSuchRevision(self._revision_sources[0], node_id)
335
# all the graphs should have identical parent lists
336
node_id = pending.pop()
338
result[node_id] = find_parents(node_id)
339
for parent_node in result[node_id]:
340
if not parent_node in result:
341
pending.add(parent_node)
342
except errors.NoSuchRevision:
347
def get_revision_graph_with_ghosts(self, revision_ids):
348
# query all the sources for their entire graphs
349
# and then build a combined graph for just
352
for source in self._revision_sources:
353
ghost_graph = source.get_revision_graph_with_ghosts()
354
graphs.append(ghost_graph.get_ancestors())
355
for revision_id in revision_ids:
358
if not revision_id in graph:
360
if absent == len(graphs):
361
raise errors.NoSuchRevision(self._revision_sources[0],
366
pending = set(revision_ids)
368
def find_parents(node_id):
369
"""find the parents for node_id."""
372
return graph[node_id]
375
raise errors.NoSuchRevision(self._revision_sources[0], node_id)
377
# all the graphs should have identical parent lists
378
node_id = pending.pop()
380
parents = find_parents(node_id)
381
for parent_node in parents:
383
if (parent_node not in pending and
384
parent_node not in done):
386
pending.add(parent_node)
387
result.add_node(node_id, parents)
389
except errors.NoSuchRevision:
391
result.add_ghost(node_id)
396
for source in self._revision_sources:
400
for source in self._revision_sources: