38
49
into the file it describes.
40
51
After bzr 0.0.5 revisions are allowed to have multiple parents.
43
List of parent revision_ids
46
Dictionary of revision properties. These are attached to the
47
revision as extra metadata. The name must be a single
48
word; the value can be an arbitrary string.
52
To support old clients this is written out in a slightly redundant
53
form: the first parent as the predecessor. This will eventually
57
List of parent revisions, each is a RevisionReference.
51
def __init__(self, revision_id, properties=None, **args):
52
self.revision_id = revision_id
53
self.properties = properties or {}
54
self._check_properties()
56
self.parent_sha1s = []
57
"""Not used anymore - legacy from for 4."""
67
def __init__(self, **args):
58
68
self.__dict__.update(args)
71
def _get_precursor(self):
72
from warnings import warn
73
warn("Revision.precursor is deprecated", stacklevel=2)
75
return self.parents[0].revision_id
80
def _get_precursor_sha1(self):
81
from warnings import warn
82
warn("Revision.precursor_sha1 is deprecated", stacklevel=2)
84
return self.parents[0].revision_sha1
90
raise Exception("can't assign to precursor anymore")
93
precursor = property(_get_precursor, _fail, _fail)
94
precursor_sha1 = property(_get_precursor_sha1, _fail, _fail)
60
98
def __repr__(self):
61
99
return "<Revision id %s>" % self.revision_id
63
def __eq__(self, other):
64
if not isinstance(other, Revision):
66
# FIXME: rbc 20050930 parent_ids are not being compared
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self.inventory_sha1 == other.inventory_sha1
69
and self.revision_id == other.revision_id
70
and self.timestamp == other.timestamp
71
and self.message == other.message
72
and self.timezone == other.timezone
73
and self.committer == other.committer
74
and self.properties == other.properties)
76
def __ne__(self, other):
77
return not self.__eq__(other)
79
def _check_properties(self):
80
"""Verify that all revision properties are OK."""
81
for name, value in self.properties.iteritems():
82
if not isinstance(name, basestring) or contains_whitespace(name):
83
raise ValueError("invalid property name %r" % name)
84
if not isinstance(value, basestring):
85
raise ValueError("invalid property value %r for %r" %
88
def get_history(self, repository):
89
"""Return the canonical line-of-history for this revision.
91
If ghosts are present this may differ in result from a ghost-free
94
current_revision = self
96
while current_revision is not None:
97
reversed_result.append(current_revision.revision_id)
98
if not len (current_revision.parent_ids):
99
reversed_result.append(None)
100
current_revision = None
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next_revision_id = current_revision.parent_ids[0]
103
current_revision = repository.get_revision(next_revision_id)
104
reversed_result.reverse()
105
return reversed_result
107
def get_summary(self):
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"""Get the first line of the log message for this revision.
110
return self.message.split('\n', 1)[0]
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def is_ancestor(revision_id, candidate_id, branch):
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"""Return true if candidate_id is an ancestor of revision_id.
116
A false negative will be returned if any intermediate descendent of
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candidate_id is not present in any of the revision_sources.
119
revisions_source is an object supporting a get_revision operation that
120
behaves like Branch's.
122
return (candidate_id in branch.repository.get_ancestry(revision_id))
125
def iter_ancestors(revision_id, revision_source, only_present=False):
126
ancestors = (revision_id,)
128
while len(ancestors) > 0:
130
for ancestor in ancestors:
132
yield ancestor, distance
134
revision = revision_source.get_revision(ancestor)
135
except errors.NoSuchRevision, e:
136
if e.revision == revision_id:
141
yield ancestor, distance
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new_ancestors.extend(revision.parent_ids)
143
ancestors = new_ancestors
147
def find_present_ancestors(revision_id, revision_source):
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"""Return the ancestors of a revision present in a branch.
150
It's possible that a branch won't have the complete ancestry of
151
one of its revisions.
155
anc_iter = enumerate(iter_ancestors(revision_id, revision_source,
157
for anc_order, (anc_id, anc_distance) in anc_iter:
158
if anc_id not in found_ancestors:
159
found_ancestors[anc_id] = (anc_order, anc_distance)
160
return found_ancestors
163
def __get_closest(intersection):
166
for entry in intersection:
167
if entry[0] == intersection[0][0]:
168
matches.append(entry[2])
172
def revision_graph(revision, revision_source):
173
"""Produce a graph of the ancestry of the specified revision.
175
:return: root, ancestors map, descendants map
177
revision_source.lock_read()
179
return _revision_graph(revision, revision_source)
181
revision_source.unlock()
184
def _revision_graph(revision, revision_source):
185
"""See revision_graph."""
186
from bzrlib.tsort import topo_sort
187
graph = revision_source.get_revision_graph(revision)
188
# mark all no-parent revisions as being NULL_REVISION parentage.
189
for node, parents in graph.items():
190
if len(parents) == 0:
191
graph[node] = [NULL_REVISION]
192
# add NULL_REVISION to the graph
193
graph[NULL_REVISION] = []
195
# pick a root. If there are multiple roots
196
# this could pick a random one.
197
topo_order = topo_sort(graph.items())
203
# map the descendants of the graph.
204
# and setup our set based return graph.
205
for node in graph.keys():
206
descendants[node] = {}
207
for node, parents in graph.items():
208
for parent in parents:
209
descendants[parent][node] = 1
210
ancestors[node] = set(parents)
212
assert root not in descendants[root]
213
assert root not in ancestors[root]
214
return root, ancestors, descendants
217
def combined_graph(revision_a, revision_b, revision_source):
218
"""Produce a combined ancestry graph.
219
Return graph root, ancestors map, descendants map, set of common nodes"""
220
root, ancestors, descendants = revision_graph(
221
revision_a, revision_source)
222
root_b, ancestors_b, descendants_b = revision_graph(
223
revision_b, revision_source)
225
raise errors.NoCommonRoot(revision_a, revision_b)
227
for node, node_anc in ancestors_b.iteritems():
228
if node in ancestors:
231
ancestors[node] = set()
232
ancestors[node].update(node_anc)
233
for node, node_dec in descendants_b.iteritems():
234
if node not in descendants:
235
descendants[node] = {}
236
descendants[node].update(node_dec)
237
return root, ancestors, descendants, common
240
def common_ancestor(revision_a, revision_b, revision_source,
242
if None in (revision_a, revision_b):
244
if NULL_REVISION in (revision_a, revision_b):
246
# trivial optimisation
247
if revision_a == revision_b:
251
pb.update('Picking ancestor', 1, 3)
252
graph = revision_source.get_revision_graph_with_ghosts(
253
[revision_a, revision_b])
254
# Shortcut the case where one of the tips is already included in
255
# the other graphs ancestry.
256
ancestry_a = graph.get_ancestry(revision_a)
257
if revision_b in ancestry_a:
259
ancestry_b = graph.get_ancestry(revision_b)
260
if revision_a in ancestry_b:
262
# convert to a NULL_REVISION based graph.
263
ancestors = graph.get_ancestors()
264
descendants = graph.get_descendants()
265
common = set(ancestry_a)
266
common.intersection_update(ancestry_b)
267
descendants[NULL_REVISION] = {}
268
ancestors[NULL_REVISION] = []
269
for root in graph.roots:
270
descendants[NULL_REVISION][root] = 1
271
ancestors[root].append(NULL_REVISION)
272
for ghost in graph.ghosts:
273
# ghosts act as roots for the purpose of finding
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# the longest paths from the root: any ghost *might*
275
# be directly attached to the root, so we treat them
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# ghost now descends from NULL
278
descendants[NULL_REVISION][ghost] = 1
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# that is it has an ancestor of NULL
280
ancestors[ghost] = [NULL_REVISION]
281
# ghost is common if any of ghosts descendants are common:
282
for ghost_descendant in descendants[ghost]:
283
if ghost_descendant in common:
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def to_element(self):
103
from bzrlib.xml import Element, SubElement
105
root = Element('revision',
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committer = self.committer,
107
timestamp = '%.9f' % self.timestamp,
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revision_id = self.revision_id,
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inventory_id = self.inventory_id,
110
inventory_sha1 = self.inventory_sha1,
113
root.set('timezone', str(self.timezone))
116
msg = SubElement(root, 'message')
117
msg.text = self.message
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# first parent stored as precursor for compatability with 0.0.5 and
124
assert pr.revision_id
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root.set('precursor', pr.revision_id)
127
root.set('precursor_sha1', pr.revision_sha1)
287
common.add(NULL_REVISION)
288
except errors.NoCommonRoot:
289
raise errors.NoCommonAncestor(revision_a, revision_b)
291
pb.update('Picking ancestor', 2, 3)
292
distances = node_distances (descendants, ancestors, root)
293
pb.update('Picking ancestor', 3, 2)
294
farthest = select_farthest(distances, common)
295
if farthest is None or farthest == NULL_REVISION:
296
raise errors.NoCommonAncestor(revision_a, revision_b)
302
class MultipleRevisionSources(object):
303
"""Proxy that looks in multiple branches for revisions."""
304
def __init__(self, *args):
305
object.__init__(self)
306
assert len(args) != 0
307
self._revision_sources = args
309
def revision_parents(self, revision_id):
310
for source in self._revision_sources:
312
return source.revision_parents(revision_id)
313
except (errors.WeaveRevisionNotPresent, errors.NoSuchRevision), e:
317
def get_revision(self, revision_id):
318
for source in self._revision_sources:
320
return source.get_revision(revision_id)
321
except errors.NoSuchRevision, e:
325
def get_revision_graph(self, revision_id):
326
# we could probe incrementally until the pending
327
# ghosts list stop growing, but its cheaper for now
328
# to just ask for the complete graph for each repository.
330
for source in self._revision_sources:
331
ghost_graph = source.get_revision_graph_with_ghosts()
332
graphs.append(ghost_graph)
335
if not revision_id in graph.get_ancestors():
337
if absent == len(graphs):
338
raise errors.NoSuchRevision(self._revision_sources[0], revision_id)
342
pending = set([revision_id])
343
def find_parents(node_id):
344
"""find the parents for node_id."""
346
ancestors = graph.get_ancestors()
348
return ancestors[node_id]
351
raise errors.NoSuchRevision(self._revision_sources[0], node_id)
353
# all the graphs should have identical parent lists
354
node_id = pending.pop()
356
result[node_id] = find_parents(node_id)
357
for parent_node in result[node_id]:
358
if not parent_node in result:
359
pending.add(parent_node)
360
except errors.NoSuchRevision:
365
def get_revision_graph_with_ghosts(self, revision_ids):
366
# query all the sources for their entire graphs
367
# and then build a combined graph for just
370
for source in self._revision_sources:
371
ghost_graph = source.get_revision_graph_with_ghosts()
372
graphs.append(ghost_graph.get_ancestors())
373
for revision_id in revision_ids:
376
if not revision_id in graph:
378
if absent == len(graphs):
379
raise errors.NoSuchRevision(self._revision_sources[0],
384
pending = set(revision_ids)
386
def find_parents(node_id):
387
"""find the parents for node_id."""
390
return graph[node_id]
393
raise errors.NoSuchRevision(self._revision_sources[0], node_id)
395
# all the graphs should have identical parent lists
396
node_id = pending.pop()
398
parents = find_parents(node_id)
399
for parent_node in parents:
401
if (parent_node not in pending and
402
parent_node not in done):
404
pending.add(parent_node)
405
result.add_node(node_id, parents)
407
except errors.NoSuchRevision:
409
result.add_ghost(node_id)
414
for source in self._revision_sources:
418
for source in self._revision_sources:
422
@deprecated_function(zero_eight)
423
def get_intervening_revisions(ancestor_id, rev_id, rev_source,
424
revision_history=None):
425
"""Find the longest line of descent from maybe_ancestor to revision.
426
Revision history is followed where possible.
428
If ancestor_id == rev_id, list will be empty.
429
Otherwise, rev_id will be the last entry. ancestor_id will never appear.
430
If ancestor_id is not an ancestor, NotAncestor will be thrown
432
root, ancestors, descendants = revision_graph(rev_id, rev_source)
433
if len(descendants) == 0:
434
raise errors.NoSuchRevision(rev_source, rev_id)
435
if ancestor_id not in descendants:
436
rev_source.get_revision(ancestor_id)
437
raise errors.NotAncestor(rev_id, ancestor_id)
438
root_descendants = all_descendants(descendants, ancestor_id)
439
root_descendants.add(ancestor_id)
440
if rev_id not in root_descendants:
441
raise errors.NotAncestor(rev_id, ancestor_id)
442
distances = node_distances(descendants, ancestors, ancestor_id,
443
root_descendants=root_descendants)
445
def best_ancestor(rev_id):
447
for anc_id in ancestors[rev_id]:
449
distance = distances[anc_id]
452
if revision_history is not None and anc_id in revision_history:
454
elif best is None or distance > best[1]:
455
best = (anc_id, distance)
460
while next != ancestor_id:
462
next = best_ancestor(next)
467
def is_reserved_id(revision_id):
468
"""Determine whether a revision id is reserved
470
:return: True if the revision is is reserved, False otherwise
472
return isinstance(revision_id, basestring) and revision_id.endswith(':')
475
def check_not_reserved_id(revision_id):
476
"""Raise ReservedId if the supplied revision_id is reserved"""
477
if is_reserved_id(revision_id):
478
raise errors.ReservedId(revision_id)
130
pelts = SubElement(root, 'parents')
131
pelts.tail = pelts.text = '\n'
132
for rr in self.parents:
133
assert isinstance(rr, RevisionReference)
134
p = SubElement(pelts, 'revision_ref')
136
assert rr.revision_id
137
p.set('revision_id', rr.revision_id)
139
p.set('revision_sha1', rr.revision_sha1)
144
def from_element(cls, elt):
145
return unpack_revision(elt)
147
from_element = classmethod(from_element)
151
def unpack_revision(elt):
152
"""Convert XML element into Revision object."""
153
# <changeset> is deprecated...
154
from bzrlib.errors import BzrError
156
if elt.tag not in ('revision', 'changeset'):
157
raise BzrError("unexpected tag in revision file: %r" % elt)
159
rev = Revision(committer = elt.get('committer'),
160
timestamp = float(elt.get('timestamp')),
161
revision_id = elt.get('revision_id'),
162
inventory_id = elt.get('inventory_id'),
163
inventory_sha1 = elt.get('inventory_sha1')
166
precursor = elt.get('precursor')
167
precursor_sha1 = elt.get('precursor_sha1')
169
pelts = elt.find('parents')
172
# revisions written prior to 0.0.5 have a single precursor
173
# give as an attribute
174
rev_ref = RevisionReference(precursor, precursor_sha1)
175
rev.parents.append(rev_ref)
178
assert p.tag == 'revision_ref', \
179
"bad parent node tag %r" % p.tag
180
rev_ref = RevisionReference(p.get('revision_id'),
181
p.get('revision_sha1'))
182
rev.parents.append(rev_ref)
184
v = elt.get('timezone')
185
rev.timezone = v and int(v)
187
rev.message = elt.findtext('message') # text of <message>
added
removed
bzrlib/revision.py
