1
# Copyright (C) 2005, 2006 Canonical Ltd
3
3
# This program is free software; you can redistribute it and/or modify
4
4
# it under the terms of the GNU General Public License as published by
5
5
# the Free Software Foundation; either version 2 of the License, or
6
6
# (at your option) any later version.
8
8
# This program is distributed in the hope that it will be useful,
9
9
# but WITHOUT ANY WARRANTY; without even the implied warranty of
10
10
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11
11
# GNU General Public License for more details.
13
13
# You should have received a copy of the GNU General Public License
14
14
# along with this program; if not, write to the Free Software
15
15
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21
class RevisionReference(object):
23
Reference to a stored revision.
25
Includes the revision_id and revision_sha1.
29
def __init__(self, revision_id, revision_sha1=None):
30
if revision_id == None \
31
or isinstance(revision_id, basestring):
32
self.revision_id = revision_id
34
raise ValueError('bad revision_id %r' % revision_id)
36
if revision_sha1 != None:
37
if isinstance(revision_sha1, basestring) \
38
and len(revision_sha1) == 40:
39
self.revision_sha1 = revision_sha1
41
raise ValueError('bad revision_sha1 %r' % revision_sha1)
17
# TODO: Some kind of command-line display of revision properties:
18
# perhaps show them in log -v and allow them as options to the commit command.
21
import bzrlib.errors as errors
22
from bzrlib.graph import node_distances, select_farthest, all_descendants, Graph
23
from bzrlib.osutils import contains_whitespace
24
from bzrlib.progress import DummyProgress
25
from bzrlib.symbol_versioning import (deprecated_function,
30
CURRENT_REVISION="current:"
45
33
class Revision(object):
73
63
def __eq__(self, other):
74
64
if not isinstance(other, Revision):
76
return (self.inventory_id == other.inventory_id
77
and self.inventory_sha1 == other.inventory_sha1
66
# FIXME: rbc 20050930 parent_ids are not being compared
68
self.inventory_sha1 == other.inventory_sha1
78
69
and self.revision_id == other.revision_id
79
70
and self.timestamp == other.timestamp
80
71
and self.message == other.message
81
72
and self.timezone == other.timezone
82
and self.committer == other.committer)
73
and self.committer == other.committer
74
and self.properties == other.properties)
84
76
def __ne__(self, other):
85
77
return not self.__eq__(other)
91
def validate_revision_id(rid):
92
"""Check rid is syntactically valid for a revision id."""
94
if not REVISION_ID_RE:
96
REVISION_ID_RE = re.compile('[\w.-]+@[\w.-]+--?\d+--?[0-9a-f]+\Z')
98
if not REVISION_ID_RE.match(rid):
99
raise ValueError("malformed revision-id %r" % rid)
101
def is_ancestor(revision_id, candidate_id, revision_source):
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
102
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):
108
"""Get the first line of the log message for this revision.
110
return self.message.split('\n', 1)[0]
113
def is_ancestor(revision_id, candidate_id, branch):
102
114
"""Return true if candidate_id is an ancestor of revision_id.
103
116
A false negative will be returned if any intermediate descendent of
104
117
candidate_id is not present in any of the revision_sources.
106
119
revisions_source is an object supporting a get_revision operation that
107
120
behaves like Branch's.
122
return (candidate_id in branch.repository.get_ancestry(revision_id))
110
for ancestor_id, distance in iter_ancestors(revision_id, revision_source):
111
if ancestor_id == candidate_id:
115
125
def iter_ancestors(revision_id, revision_source, only_present=False):
116
126
ancestors = (revision_id,)
162
def common_ancestor(revision_a, revision_b, revision_source):
163
"""Find the ancestor common to both revisions that is closest to both.
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
165
from bzrlib.trace import mutter
166
a_ancestors = find_present_ancestors(revision_a, revision_source)
167
b_ancestors = find_present_ancestors(revision_b, revision_source)
170
# a_order is used as a tie-breaker when two equally-good bases are found
171
for revision, (a_order, a_distance) in a_ancestors.iteritems():
172
if b_ancestors.has_key(revision):
173
a_intersection.append((a_distance, a_order, revision))
174
b_intersection.append((b_ancestors[revision][1], a_order, revision))
175
mutter("a intersection: %r" % a_intersection)
176
mutter("b intersection: %r" % b_intersection)
178
a_closest = __get_closest(a_intersection)
179
if len(a_closest) == 0:
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):
181
b_closest = __get_closest(b_intersection)
182
assert len(b_closest) != 0
183
mutter ("a_closest %r" % a_closest)
184
mutter ("b_closest %r" % b_closest)
185
if a_closest[0] in b_closest:
187
elif b_closest[0] in a_closest:
190
raise bzrlib.errors.AmbiguousBase((a_closest[0], b_closest[0]))
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
# convert to a NULL_REVISION based graph.
255
ancestors = graph.get_ancestors()
256
descendants = graph.get_descendants()
257
common = set(graph.get_ancestry(revision_a)).intersection(
258
set(graph.get_ancestry(revision_b)))
259
descendants[NULL_REVISION] = {}
260
ancestors[NULL_REVISION] = []
261
for root in graph.roots:
262
descendants[NULL_REVISION][root] = 1
263
ancestors[root].append(NULL_REVISION)
264
for ghost in graph.ghosts:
265
# ghosts act as roots for the purpose of finding
266
# the longest paths from the root: any ghost *might*
267
# be directly attached to the root, so we treat them
269
# ghost now descends from NULL
270
descendants[NULL_REVISION][ghost] = 1
271
# that is it has an ancestor of NULL
272
ancestors[ghost] = [NULL_REVISION]
273
# ghost is common if any of ghosts descendants are common:
274
for ghost_descendant in descendants[ghost]:
275
if ghost_descendant in common:
279
common.add(NULL_REVISION)
280
except errors.NoCommonRoot:
281
raise errors.NoCommonAncestor(revision_a, revision_b)
283
pb.update('Picking ancestor', 2, 3)
284
distances = node_distances (descendants, ancestors, root)
285
pb.update('Picking ancestor', 3, 2)
286
farthest = select_farthest(distances, common)
287
if farthest is None or farthest == NULL_REVISION:
288
raise errors.NoCommonAncestor(revision_a, revision_b)
193
294
class MultipleRevisionSources(object):
194
295
"""Proxy that looks in multiple branches for revisions."""
197
298
assert len(args) != 0
198
299
self._revision_sources = args
301
def revision_parents(self, revision_id):
302
for source in self._revision_sources:
304
return source.revision_parents(revision_id)
305
except (errors.WeaveRevisionNotPresent, errors.NoSuchRevision), e:
200
309
def get_revision(self, revision_id):
201
310
for source in self._revision_sources:
203
312
return source.get_revision(revision_id)
204
except bzrlib.errors.NoSuchRevision, e:
313
except errors.NoSuchRevision, e:
208
def get_intervening_revisions(ancestor_id, rev_id, rev_source,
317
def get_revision_graph(self, revision_id):
318
# we could probe incrementally until the pending
319
# ghosts list stop growing, but its cheaper for now
320
# to just ask for the complete graph for each repository.
322
for source in self._revision_sources:
323
ghost_graph = source.get_revision_graph_with_ghosts()
324
graphs.append(ghost_graph)
327
if not revision_id in graph.get_ancestors():
329
if absent == len(graphs):
330
raise errors.NoSuchRevision(self._revision_sources[0], revision_id)
334
pending = set([revision_id])
335
def find_parents(node_id):
336
"""find the parents for node_id."""
338
ancestors = graph.get_ancestors()
340
return ancestors[node_id]
343
raise errors.NoSuchRevision(self._revision_sources[0], node_id)
345
# all the graphs should have identical parent lists
346
node_id = pending.pop()
348
result[node_id] = find_parents(node_id)
349
for parent_node in result[node_id]:
350
if not parent_node in result:
351
pending.add(parent_node)
352
except errors.NoSuchRevision:
357
def get_revision_graph_with_ghosts(self, revision_ids):
358
# query all the sources for their entire graphs
359
# and then build a combined graph for just
362
for source in self._revision_sources:
363
ghost_graph = source.get_revision_graph_with_ghosts()
364
graphs.append(ghost_graph.get_ancestors())
365
for revision_id in revision_ids:
368
if not revision_id in graph:
370
if absent == len(graphs):
371
raise errors.NoSuchRevision(self._revision_sources[0],
376
pending = set(revision_ids)
378
def find_parents(node_id):
379
"""find the parents for node_id."""
382
return graph[node_id]
385
raise errors.NoSuchRevision(self._revision_sources[0], node_id)
387
# all the graphs should have identical parent lists
388
node_id = pending.pop()
390
parents = find_parents(node_id)
391
for parent_node in parents:
393
if (parent_node not in pending and
394
parent_node not in done):
396
pending.add(parent_node)
397
result.add_node(node_id, parents)
399
except errors.NoSuchRevision:
401
result.add_ghost(node_id)
406
for source in self._revision_sources:
410
for source in self._revision_sources:
414
@deprecated_function(zero_eight)
415
def get_intervening_revisions(ancestor_id, rev_id, rev_source,
209
416
revision_history=None):
210
417
"""Find the longest line of descent from maybe_ancestor to revision.
211
418
Revision history is followed where possible.
214
421
Otherwise, rev_id will be the last entry. ancestor_id will never appear.
215
422
If ancestor_id is not an ancestor, NotAncestor will be thrown
217
[rev_source.get_revision(r) for r in (ancestor_id, rev_id)]
218
if ancestor_id == rev_id:
220
def historical_lines(line):
221
"""Return a tuple of historical/non_historical lines, for sorting.
222
The non_historical count is negative, since non_historical lines are
227
for revision in line:
228
if revision in revision_history:
232
return good_count, bad_count
234
successful_lines = []
235
while len(active) > 0:
238
parent_ids = [p.revision_id for p in
239
rev_source.get_revision(line[-1]).parents]
240
for parent in parent_ids:
242
if parent == ancestor_id:
243
successful_lines.append(line_copy)
245
line_copy.append(parent)
246
new_active.append(line_copy)
248
if len(successful_lines) == 0:
249
raise bzrlib.errors.NotAncestor(rev_id, ancestor_id)
250
for line in successful_lines:
252
if revision_history is not None:
253
by_historical_lines = []
254
for line in successful_lines:
255
count = historical_lines(line)
256
by_historical_lines.append((count, line))
257
by_historical_lines.sort()
258
if by_historical_lines[-1][0][0] > 0:
259
return by_historical_lines[-1][1]
260
assert len(successful_lines)
261
successful_lines.sort(cmp, len)
262
return successful_lines[-1]
424
root, ancestors, descendants = revision_graph(rev_id, rev_source)
425
if len(descendants) == 0:
426
raise errors.NoSuchRevision(rev_source, rev_id)
427
if ancestor_id not in descendants:
428
rev_source.get_revision(ancestor_id)
429
raise errors.NotAncestor(rev_id, ancestor_id)
430
root_descendants = all_descendants(descendants, ancestor_id)
431
root_descendants.add(ancestor_id)
432
if rev_id not in root_descendants:
433
raise errors.NotAncestor(rev_id, ancestor_id)
434
distances = node_distances(descendants, ancestors, ancestor_id,
435
root_descendants=root_descendants)
437
def best_ancestor(rev_id):
439
for anc_id in ancestors[rev_id]:
441
distance = distances[anc_id]
444
if revision_history is not None and anc_id in revision_history:
446
elif best is None or distance > best[1]:
447
best = (anc_id, distance)
452
while next != ancestor_id:
454
next = best_ancestor(next)
added
removed
bzrlib/revision.py
