51
37
After bzr 0.0.5 revisions are allowed to have multiple parents.
54
List of parent revisions, each is a RevisionReference.
40
List of parent revision_ids
43
Dictionary of revision properties. These are attached to the
44
revision as extra metadata. The name must be a single
45
word; the value can be an arbitrary string.
64
def __init__(self, **args):
48
def __init__(self, revision_id, properties=None, **args):
49
self.revision_id = revision_id
50
self.properties = properties or {}
51
self._check_properties()
53
self.parent_sha1s = []
65
54
self.__dict__.update(args)
69
56
def __repr__(self):
70
57
return "<Revision id %s>" % self.revision_id
74
from bzrlib.xml import Element, SubElement
76
root = Element('revision',
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committer = self.committer,
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timestamp = '%.9f' % self.timestamp,
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revision_id = self.revision_id,
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inventory_id = self.inventory_id,
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inventory_sha1 = self.inventory_sha1,
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root.set('timezone', str(self.timezone))
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msg = SubElement(root, 'message')
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msg.text = self.message
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pelts = SubElement(root, 'parents')
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pelts.tail = pelts.text = '\n'
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for rr in self.parents:
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assert isinstance(rr, RevisionReference)
96
p = SubElement(pelts, 'revision_ref')
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p.set('revision_id', rr.revision_id)
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p.set('revision_sha1', rr.revision_sha1)
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def from_element(cls, elt):
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return unpack_revision(elt)
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from_element = classmethod(from_element)
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def unpack_revision(elt):
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"""Convert XML element into Revision object."""
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# <changeset> is deprecated...
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from bzrlib.errors import BzrError
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if elt.tag not in ('revision', 'changeset'):
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raise BzrError("unexpected tag in revision file: %r" % elt)
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rev = Revision(committer = elt.get('committer'),
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timestamp = float(elt.get('timestamp')),
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revision_id = elt.get('revision_id'),
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inventory_id = elt.get('inventory_id'),
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inventory_sha1 = elt.get('inventory_sha1')
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precursor = elt.get('precursor')
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precursor_sha1 = elt.get('precursor_sha1')
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pelts = elt.find('parents')
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assert p.tag == 'revision_ref', \
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"bad parent node tag %r" % p.tag
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rev_ref = RevisionReference(p.get('revision_id'),
138
p.get('revision_sha1'))
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rev.parents.append(rev_ref)
143
prec_parent = rev.parents[0].revision_id
144
assert prec_parent == precursor
146
# revisions written prior to 0.0.5 have a single precursor
147
# give as an attribute
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rev_ref = RevisionReference(precursor, precursor_sha1)
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rev.parents.append(rev_ref)
151
v = elt.get('timezone')
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rev.timezone = v and int(v)
154
rev.message = elt.findtext('message') # text of <message>
159
REVISION_ID_RE = None
161
def validate_revision_id(rid):
162
"""Check rid is syntactically valid for a revision id."""
163
global REVISION_ID_RE
164
if not REVISION_ID_RE:
166
REVISION_ID_RE = re.compile('[\w.-]+@[\w.-]+--?\d+--?[0-9a-f]+\Z')
168
if not REVISION_ID_RE.match(rid):
169
raise ValueError("malformed revision-id %r" % rid)
171
def is_ancestor(revision_id, candidate_id, revision_source):
59
def __eq__(self, other):
60
if not isinstance(other, Revision):
62
# FIXME: rbc 20050930 parent_ids are not being compared
64
self.inventory_sha1 == other.inventory_sha1
65
and self.revision_id == other.revision_id
66
and self.timestamp == other.timestamp
67
and self.message == other.message
68
and self.timezone == other.timezone
69
and self.committer == other.committer
70
and self.properties == other.properties)
72
def __ne__(self, other):
73
return not self.__eq__(other)
75
def _check_properties(self):
76
"""Verify that all revision properties are OK.
78
for name, value in self.properties.iteritems():
79
if not isinstance(name, basestring) or contains_whitespace(name):
80
raise ValueError("invalid property name %r" % name)
81
if not isinstance(value, basestring):
82
raise ValueError("invalid property value %r for %r" %
85
def get_history(self, repository):
86
"""Return the canonical line-of-history for this revision.
88
If ghosts are present this may differ in result from a ghost-free
91
current_revision = self
93
while current_revision is not None:
94
reversed_result.append(current_revision.revision_id)
95
if not len (current_revision.parent_ids):
96
reversed_result.append(None)
97
current_revision = None
99
next_revision_id = current_revision.parent_ids[0]
100
current_revision = repository.get_revision(next_revision_id)
101
reversed_result.reverse()
102
return reversed_result
105
def is_ancestor(revision_id, candidate_id, branch):
172
106
"""Return true if candidate_id is an ancestor of revision_id.
173
108
A false negative will be returned if any intermediate descendent of
174
109
candidate_id is not present in any of the revision_sources.
176
111
revisions_source is an object supporting a get_revision operation that
177
112
behaves like Branch's.
180
from bzrlib.branch import NoSuchRevision
114
return candidate_id in branch.repository.get_ancestry(revision_id)
117
def iter_ancestors(revision_id, revision_source, only_present=False):
181
118
ancestors = (revision_id,)
182
120
while len(ancestors) > 0:
183
121
new_ancestors = []
184
122
for ancestor in ancestors:
185
if ancestor == candidate_id:
124
yield ancestor, distance
188
126
revision = revision_source.get_revision(ancestor)
189
except NoSuchRevision, e:
127
except bzrlib.errors.NoSuchRevision, e:
190
128
if e.revision == revision_id:
194
new_ancestors.extend([p.revision_id for p in revision.parents])
133
yield ancestor, distance
134
new_ancestors.extend(revision.parent_ids)
195
135
ancestors = new_ancestors
139
def find_present_ancestors(revision_id, revision_source):
140
"""Return the ancestors of a revision present in a branch.
142
It's possible that a branch won't have the complete ancestry of
143
one of its revisions.
147
anc_iter = enumerate(iter_ancestors(revision_id, revision_source,
149
for anc_order, (anc_id, anc_distance) in anc_iter:
150
if not found_ancestors.has_key(anc_id):
151
found_ancestors[anc_id] = (anc_order, anc_distance)
152
return found_ancestors
155
def __get_closest(intersection):
158
for entry in intersection:
159
if entry[0] == intersection[0][0]:
160
matches.append(entry[2])
164
def revision_graph(revision, revision_source):
165
"""Produce a graph of the ancestry of the specified revision.
167
:return: root, ancestors map, descendants map
169
revision_source.lock_read()
171
return _revision_graph(revision, revision_source)
173
revision_source.unlock()
176
def _revision_graph(revision, revision_source):
177
"""See revision_graph."""
178
from bzrlib.tsort import topo_sort
179
graph = revision_source.get_revision_graph(revision)
180
# mark all no-parent revisions as being NULL_REVISION parentage.
181
for node, parents in graph.items():
182
if len(parents) == 0:
183
graph[node] = [NULL_REVISION]
184
# add NULL_REVISION to the graph
185
graph[NULL_REVISION] = []
187
# pick a root. If there are multiple roots
188
# this could pick a random one.
189
topo_order = topo_sort(graph.items())
195
# map the descendants of the graph.
196
# and setup our set based return graph.
197
for node in graph.keys():
198
descendants[node] = {}
199
for node, parents in graph.items():
200
for parent in parents:
201
descendants[parent][node] = 1
202
ancestors[node] = set(parents)
204
assert root not in descendants[root]
205
assert root not in ancestors[root]
206
return root, ancestors, descendants
209
def combined_graph(revision_a, revision_b, revision_source):
210
"""Produce a combined ancestry graph.
211
Return graph root, ancestors map, descendants map, set of common nodes"""
212
root, ancestors, descendants = revision_graph(
213
revision_a, revision_source)
214
root_b, ancestors_b, descendants_b = revision_graph(
215
revision_b, revision_source)
217
raise bzrlib.errors.NoCommonRoot(revision_a, revision_b)
219
for node, node_anc in ancestors_b.iteritems():
220
if node in ancestors:
223
ancestors[node] = set()
224
ancestors[node].update(node_anc)
225
for node, node_dec in descendants_b.iteritems():
226
if node not in descendants:
227
descendants[node] = {}
228
descendants[node].update(node_dec)
229
return root, ancestors, descendants, common
232
def common_ancestor(revision_a, revision_b, revision_source,
234
if None in (revision_a, revision_b):
236
# trivial optimisation
237
if revision_a == revision_b:
241
pb.update('Picking ancestor', 1, 3)
242
graph = revision_source.get_revision_graph_with_ghosts(
243
[revision_a, revision_b])
244
# convert to a NULL_REVISION based graph.
245
ancestors = graph.get_ancestors()
246
descendants = graph.get_descendants()
247
common = set(graph.get_ancestry(revision_a)).intersection(
248
set(graph.get_ancestry(revision_b)))
249
descendants[NULL_REVISION] = {}
250
ancestors[NULL_REVISION] = []
251
for root in graph.roots:
252
descendants[NULL_REVISION][root] = 1
253
ancestors[root].append(NULL_REVISION)
254
for ghost in graph.ghosts:
255
# ghosts act as roots for the purpose of finding
256
# the longest paths from the root: any ghost *might*
257
# be directly attached to the root, so we treat them
259
# ghost now descends from NULL
260
descendants[NULL_REVISION][ghost] = 1
261
# 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)
198
284
class MultipleRevisionSources(object):
285
"""Proxy that looks in multiple branches for revisions."""
199
286
def __init__(self, *args):
200
287
object.__init__(self)
201
288
assert len(args) != 0
202
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:
204
299
def get_revision(self, revision_id):
205
from bzrlib.branch import NoSuchRevision
206
300
for source in self._revision_sources:
208
302
return source.get_revision(revision_id)
209
except NoSuchRevision, e:
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:
404
@deprecated_method(zero_eight)
405
def get_intervening_revisions(ancestor_id, rev_id, rev_source,
406
revision_history=None):
407
"""Find the longest line of descent from maybe_ancestor to revision.
408
Revision history is followed where possible.
410
If ancestor_id == rev_id, list will be empty.
411
Otherwise, rev_id will be the last entry. ancestor_id will never appear.
412
If ancestor_id is not an ancestor, NotAncestor will be thrown
414
root, ancestors, descendants = revision_graph(rev_id, rev_source)
415
if len(descendants) == 0:
416
raise NoSuchRevision(rev_source, rev_id)
417
if ancestor_id not in descendants:
418
rev_source.get_revision(ancestor_id)
419
raise bzrlib.errors.NotAncestor(rev_id, ancestor_id)
420
root_descendants = all_descendants(descendants, ancestor_id)
421
root_descendants.add(ancestor_id)
422
if rev_id not in root_descendants:
423
raise bzrlib.errors.NotAncestor(rev_id, ancestor_id)
424
distances = node_distances(descendants, ancestors, ancestor_id,
425
root_descendants=root_descendants)
427
def best_ancestor(rev_id):
429
for anc_id in ancestors[rev_id]:
431
distance = distances[anc_id]
434
if revision_history is not None and anc_id in revision_history:
436
elif best is None or distance > best[1]:
437
best = (anc_id, distance)
442
while next != ancestor_id:
444
next = best_ancestor(next)
added
removed
bzrlib/revision.py
