160
199
each version; the parent's parents are implied.
163
List of hex SHA-1 of each version, or None if not recorded.
202
List of hex SHA-1 of each version.
205
List of symbolic names for each version. Each should be unique.
208
For each name, the version number.
211
Descriptive name of this weave; typically the filename if known.
166
__slots__ = ['_weave', '_parents', '_sha1s']
215
__slots__ = ['_weave', '_parents', '_sha1s', '_names', '_name_map',
216
'_weave_name', '_matcher']
218
def __init__(self, weave_name=None, access_mode='w', matcher=None, get_scope=None):
221
:param get_scope: A callable that returns an opaque object to be used
222
for detecting when this weave goes out of scope (should stop
223
answering requests or allowing mutation).
225
super(Weave, self).__init__(access_mode)
170
227
self._parents = []
231
self._weave_name = weave_name
233
self._matcher = bzrlib.patiencediff.PatienceSequenceMatcher
235
self._matcher = matcher
236
if get_scope is None:
237
get_scope = lambda:None
238
self._get_scope = get_scope
239
self._scope = get_scope()
240
self._access_mode = access_mode
243
return "Weave(%r)" % self._weave_name
245
def _check_write_ok(self):
246
"""Is the versioned file marked as 'finished' ? Raise if it is."""
247
if self._get_scope() != self._scope:
248
raise errors.OutSideTransaction()
249
if self._access_mode != 'w':
250
raise errors.ReadOnlyObjectDirtiedError(self)
253
"""Return a deep copy of self.
255
The copy can be modified without affecting the original weave."""
257
other._weave = self._weave[:]
258
other._parents = self._parents[:]
259
other._sha1s = self._sha1s[:]
260
other._names = self._names[:]
261
other._name_map = self._name_map.copy()
262
other._weave_name = self._weave_name
174
265
def __eq__(self, other):
175
266
if not isinstance(other, Weave):
177
268
return self._parents == other._parents \
178
and self._weave == other._weave
269
and self._weave == other._weave \
270
and self._sha1s == other._sha1s
181
272
def __ne__(self, other):
182
273
return not self.__eq__(other)
185
def add(self, parents, text):
275
def _idx_to_name(self, version):
276
return self._names[version]
278
def _lookup(self, name):
279
"""Convert symbolic version name to index."""
280
self.check_not_reserved_id(name)
282
return self._name_map[name]
284
raise RevisionNotPresent(name, self._weave_name)
287
"""See VersionedFile.versions."""
288
return self._names[:]
290
def has_version(self, version_id):
291
"""See VersionedFile.has_version."""
292
return (version_id in self._name_map)
294
__contains__ = has_version
296
def get_record_stream(self, versions, ordering, include_delta_closure):
297
"""Get a stream of records for versions.
299
:param versions: The versions to include. Each version is a tuple
301
:param ordering: Either 'unordered' or 'topological'. A topologically
302
sorted stream has compression parents strictly before their
304
:param include_delta_closure: If True then the closure across any
305
compression parents will be included (in the opaque data).
306
:return: An iterator of ContentFactory objects, each of which is only
307
valid until the iterator is advanced.
309
if ordering == 'topological':
310
parents = self.get_parent_map(versions)
311
versions = topo_sort(parents)
312
for version in versions:
314
yield WeaveContentFactory(version, self)
316
yield AbsentContentFactory((version,))
318
def get_parent_map(self, version_ids):
319
"""See VersionedFile.get_parent_map."""
321
for version_id in version_ids:
323
result[version_id] = tuple(
324
map(self._idx_to_name, self._parents[self._lookup(version_id)]))
325
except RevisionNotPresent:
329
def get_parents_with_ghosts(self, version_id):
330
raise NotImplementedError(self.get_parents_with_ghosts)
332
def insert_record_stream(self, stream):
333
"""Insert a record stream into this versioned file.
335
:param stream: A stream of records to insert.
337
:seealso VersionedFile.get_record_stream:
340
for record in stream:
341
# adapt to non-tuple interface
342
parents = [parent[0] for parent in record.parents]
343
if record.storage_kind == 'fulltext':
344
self.add_lines(record.key[0], parents,
345
split_lines(record.get_bytes_as('fulltext')))
347
adapter_key = record.storage_kind, 'fulltext'
349
adapter = adapters[adapter_key]
351
adapter_factory = adapter_registry.get(adapter_key)
352
adapter = adapter_factory(self)
353
adapters[adapter_key] = adapter
354
lines = split_lines(adapter.get_bytes(
355
record, record.get_bytes_as(record.storage_kind)))
357
self.add_lines(record.key[0], parents, lines)
358
except RevisionAlreadyPresent:
361
def _check_repeated_add(self, name, parents, text, sha1):
362
"""Check that a duplicated add is OK.
364
If it is, return the (old) index; otherwise raise an exception.
366
idx = self._lookup(name)
367
if sorted(self._parents[idx]) != sorted(parents) \
368
or sha1 != self._sha1s[idx]:
369
raise RevisionAlreadyPresent(name, self._weave_name)
372
def _add_lines(self, version_id, parents, lines, parent_texts,
373
left_matching_blocks, nostore_sha, random_id, check_content):
374
"""See VersionedFile.add_lines."""
375
idx = self._add(version_id, lines, map(self._lookup, parents),
376
nostore_sha=nostore_sha)
377
return sha_strings(lines), sum(map(len, lines)), idx
379
def _add(self, version_id, lines, parents, sha1=None, nostore_sha=None):
186
380
"""Add a single text on top of the weave.
188
382
Returns the index number of the newly added version.
385
Symbolic name for this version.
386
(Typically the revision-id of the revision that added it.)
191
389
List or set of direct parent version numbers.
194
Sequence of lines to be added in the new version."""
392
Sequence of lines to be added in the new version.
394
:param nostore_sha: See VersionedFile.add_lines.
396
assert isinstance(version_id, basestring)
397
self._check_lines_not_unicode(lines)
398
self._check_lines_are_lines(lines)
400
sha1 = sha_strings(lines)
401
if sha1 == nostore_sha:
402
raise errors.ExistingContent
403
if version_id in self._name_map:
404
return self._check_repeated_add(version_id, parents, lines, sha1)
196
406
self._check_versions(parents)
197
## self._check_lines(text)
407
## self._check_lines(lines)
198
408
new_version = len(self._parents)
206
# if we abort after here the weave will be corrupt
207
self._parents.append(frozenset(parents))
410
# if we abort after here the (in-memory) weave will be corrupt because only
411
# some fields are updated
412
# XXX: FIXME implement a succeed-or-fail of the rest of this routine.
413
# - Robert Collins 20060226
414
self._parents.append(parents[:])
208
415
self._sha1s.append(sha1)
416
self._names.append(version_id)
417
self._name_map[version_id] = new_version
446
assert isinstance(l, basestring)
730
assert l.__class__ in (str, unicode)
447
731
if isactive is None:
448
732
isactive = (not dset) and istack and (istack[-1] in included)
450
734
result.append((istack[-1], lineno, l))
454
raise WFE("unclosed insertion blocks at end of weave",
737
raise WeaveFormatError("unclosed insertion blocks "
738
"at end of weave: %s" % istack)
457
raise WFE("unclosed deletion blocks at end of weave",
464
def get_iter(self, version):
465
"""Yield lines for the specified version."""
466
for origin, lineno, line in self._extract([version]):
470
def get(self, index):
471
return list(self.get_iter(index))
474
def mash_iter(self, included):
475
"""Return composed version of multiple included versions."""
476
for origin, lineno, text in self._extract(included):
480
def dump(self, to_file):
481
from pprint import pprint
482
print >>to_file, "Weave._weave = ",
483
pprint(self._weave, to_file)
484
print >>to_file, "Weave._parents = ",
485
pprint(self._parents, to_file)
489
def numversions(self):
740
raise WeaveFormatError("unclosed deletion blocks at end of weave: %s"
744
def _maybe_lookup(self, name_or_index):
745
"""Convert possible symbolic name to index, or pass through indexes.
749
if isinstance(name_or_index, (int, long)):
752
return self._lookup(name_or_index)
754
def get_lines(self, version_id):
755
"""See VersionedFile.get_lines()."""
756
int_index = self._maybe_lookup(version_id)
757
result = [line for (origin, lineno, line) in self._extract([int_index])]
758
expected_sha1 = self._sha1s[int_index]
759
measured_sha1 = sha_strings(result)
760
if measured_sha1 != expected_sha1:
761
raise errors.WeaveInvalidChecksum(
762
'file %s, revision %s, expected: %s, measured %s'
763
% (self._weave_name, version_id,
764
expected_sha1, measured_sha1))
767
def get_sha1s(self, version_ids):
768
"""See VersionedFile.get_sha1s()."""
769
return [self._sha1s[self._lookup(v)] for v in version_ids]
771
def num_versions(self):
772
"""How many versions are in this weave?"""
490
773
l = len(self._parents)
491
774
assert l == len(self._sha1s)
496
return self.numversions()
777
__len__ = num_versions
499
779
def check(self, progress_bar=None):
500
# check no circular inclusions
501
for version in range(self.numversions()):
780
# TODO evaluate performance hit of using string sets in this routine.
781
# TODO: check no circular inclusions
782
# TODO: create a nested progress bar
783
for version in range(self.num_versions()):
502
784
inclusions = list(self._parents[version])
504
786
inclusions.sort()
506
788
raise WeaveFormatError("invalid included version %d for index %d"
507
789
% (inclusions[-1], version))
509
# try extracting all versions; this is a bit slow and parallel
510
# extraction could be used
512
nv = self.numversions()
513
for version in range(nv):
791
# try extracting all versions; parallel extraction is used
792
nv = self.num_versions()
797
# For creating the ancestry, IntSet is much faster (3.7s vs 0.17s)
798
# The problem is that set membership is much more expensive
799
name = self._idx_to_name(i)
800
sha1s[name] = sha.new()
802
new_inc = set([name])
803
for p in self._parents[i]:
804
new_inc.update(inclusions[self._idx_to_name(p)])
806
assert set(new_inc) == set(self.get_ancestry(name)), \
807
'failed %s != %s' % (set(new_inc), set(self.get_ancestry(name)))
808
inclusions[name] = new_inc
810
nlines = len(self._weave)
812
update_text = 'checking weave'
814
short_name = os.path.basename(self._weave_name)
815
update_text = 'checking %s' % (short_name,)
816
update_text = update_text[:25]
818
for lineno, insert, deleteset, line in self._walk_internal():
515
progress_bar.update('checking text', version, nv)
517
for l in self.get_iter(version):
520
expected = self._sha1s[version]
820
progress_bar.update(update_text, lineno, nlines)
822
for name, name_inclusions in inclusions.items():
823
# The active inclusion must be an ancestor,
824
# and no ancestors must have deleted this line,
825
# because we don't support resurrection.
826
if (insert in name_inclusions) and not (deleteset & name_inclusions):
827
sha1s[name].update(line)
830
version = self._idx_to_name(i)
831
hd = sha1s[version].hexdigest()
832
expected = self._sha1s[i]
521
833
if hd != expected:
522
raise WeaveError("mismatched sha1 for version %d; "
523
"got %s, expected %s"
524
% (version, hd, expected))
834
raise errors.WeaveInvalidChecksum(
835
"mismatched sha1 for version %s: "
836
"got %s, expected %s"
837
% (version, hd, expected))
526
839
# TODO: check insertions are properly nested, that there are
527
840
# no lines outside of insertion blocks, that deletions are
528
841
# properly paired, etc.
532
def merge(self, merge_versions):
533
"""Automerge and mark conflicts between versions.
535
This returns a sequence, each entry describing alternatives
536
for a chunk of the file. Each of the alternatives is given as
539
If there is a chunk of the file where there's no diagreement,
540
only one alternative is given.
543
# approach: find the included versions common to all the
545
raise NotImplementedError()
549
def _delta(self, included, lines):
550
"""Return changes from basis to new revision.
552
The old text for comparison is the union of included revisions.
554
This is used in inserting a new text.
556
Delta is returned as a sequence of
557
(weave1, weave2, newlines).
559
This indicates that weave1:weave2 of the old weave should be
560
replaced by the sequence of lines in newlines. Note that
561
these line numbers are positions in the total weave and don't
562
correspond to the lines in any extracted version, or even the
563
extracted union of included versions.
565
If line1=line2, this is a pure insert; if newlines=[] this is a
566
pure delete. (Similar to difflib.)
571
def plan_merge(self, ver_a, ver_b):
572
"""Return pseudo-annotation indicating how the two versions merge.
574
This is computed between versions a and b and their common
577
Weave lines present in none of them are skipped entirely.
579
inc_a = self.inclusions([ver_a])
580
inc_b = self.inclusions([ver_b])
581
inc_c = inc_a & inc_b
583
for lineno, insert, deleteset, line in self._walk():
584
if deleteset & inc_c:
585
# killed in parent; can't be in either a or b
586
# not relevant to our work
587
yield 'killed-base', line
588
elif insert in inc_c:
589
# was inserted in base
590
killed_a = bool(deleteset & inc_a)
591
killed_b = bool(deleteset & inc_b)
592
if killed_a and killed_b:
593
yield 'killed-both', line
595
yield 'killed-a', line
597
yield 'killed-b', line
599
yield 'unchanged', line
600
elif insert in inc_a:
601
if deleteset & inc_a:
602
yield 'ghost-a', line
606
elif insert in inc_b:
607
if deleteset & inc_b:
608
yield 'ghost-b', line
612
# not in either revision
613
yield 'irrelevant', line
615
yield 'unchanged', '' # terminator
619
def weave_merge(self, plan):
624
for state, line in plan:
625
if state == 'unchanged' or state == 'killed-both':
626
# resync and flush queued conflicts changes if any
627
if not lines_a and not lines_b:
629
elif ch_a and not ch_b:
631
for l in lines_a: yield l
632
elif ch_b and not ch_a:
633
for l in lines_b: yield l
634
elif lines_a == lines_b:
635
for l in lines_a: yield l
638
for l in lines_a: yield l
640
for l in lines_b: yield l
647
if state == 'unchanged':
650
elif state == 'killed-a':
653
elif state == 'killed-b':
656
elif state == 'new-a':
659
elif state == 'new-b':
663
assert state in ('irrelevant', 'ghost-a', 'ghost-b', 'killed-base',
674
"""Show some text information about the weave."""
675
print '%6s %40s %20s' % ('ver', 'sha1', 'parents')
676
for i in (6, 40, 20):
843
def _join(self, other, pb, msg, version_ids, ignore_missing):
844
"""Worker routine for join()."""
845
if not other.versions():
846
return # nothing to update, easy
849
# versions is never none, InterWeave checks this.
852
# two loops so that we do not change ourselves before verifying it
854
# work through in index order to make sure we get all dependencies
857
# get the selected versions only that are in other.versions.
858
version_ids = set(other.versions()).intersection(set(version_ids))
859
# pull in the referenced graph.
860
version_ids = other.get_ancestry(version_ids)
861
pending_parents = other.get_parent_map(version_ids)
862
pending_graph = pending_parents.items()
863
if len(pending_graph) != len(version_ids):
864
raise RevisionNotPresent(
865
set(version_ids) - set(pending_parents.keys()), self)
866
for name in topo_sort(pending_graph):
867
other_idx = other._name_map[name]
868
# returns True if we have it, False if we need it.
869
if not self._check_version_consistent(other, other_idx, name):
870
names_to_join.append((other_idx, name))
878
for other_idx, name in names_to_join:
879
# TODO: If all the parents of the other version are already
880
# present then we can avoid some work by just taking the delta
881
# and adjusting the offsets.
882
new_parents = self._imported_parents(other, other_idx)
883
sha1 = other._sha1s[other_idx]
888
pb.update(msg, merged, len(names_to_join))
890
lines = other.get_lines(other_idx)
891
self._add(name, lines, new_parents, sha1)
893
mutter("merged = %d, processed = %d, file_id=%s; deltat=%d"%(
894
merged, processed, self._weave_name, time.time()-time0))
896
def _imported_parents(self, other, other_idx):
897
"""Return list of parents in self corresponding to indexes in other."""
899
for parent_idx in other._parents[other_idx]:
900
parent_name = other._names[parent_idx]
901
if parent_name not in self._name_map:
902
# should not be possible
903
raise WeaveError("missing parent {%s} of {%s} in %r"
904
% (parent_name, other._name_map[other_idx], self))
905
new_parents.append(self._name_map[parent_name])
908
def _check_version_consistent(self, other, other_idx, name):
909
"""Check if a version in consistent in this and other.
911
To be consistent it must have:
914
* the same direct parents (by name, not index, and disregarding
917
If present & correct return True;
918
if not present in self return False;
919
if inconsistent raise error."""
920
this_idx = self._name_map.get(name, -1)
922
if self._sha1s[this_idx] != other._sha1s[other_idx]:
923
raise errors.WeaveTextDiffers(name, self, other)
924
self_parents = self._parents[this_idx]
925
other_parents = other._parents[other_idx]
926
n1 = set([self._names[i] for i in self_parents])
927
n2 = set([other._names[i] for i in other_parents])
928
if not self._compatible_parents(n1, n2):
929
raise WeaveParentMismatch("inconsistent parents "
930
"for version {%s}: %s vs %s" % (name, n1, n2))
936
def _reweave(self, other, pb, msg):
937
"""Reweave self with other - internal helper for join().
939
:param other: The other weave to merge
940
:param pb: An optional progress bar, indicating how far done we are
941
:param msg: An optional message for the progress
943
new_weave = _reweave(self, other, pb=pb, msg=msg)
944
self._copy_weave_content(new_weave)
946
def _copy_weave_content(self, otherweave):
947
"""adsorb the content from otherweave."""
948
for attr in self.__slots__:
949
if attr != '_weave_name':
950
setattr(self, attr, copy(getattr(otherweave, attr)))
953
class WeaveFile(Weave):
954
"""A WeaveFile represents a Weave on disk and writes on change."""
956
WEAVE_SUFFIX = '.weave'
958
def __init__(self, name, transport, filemode=None, create=False, access_mode='w', get_scope=None):
959
"""Create a WeaveFile.
961
:param create: If not True, only open an existing knit.
963
super(WeaveFile, self).__init__(name, access_mode, get_scope=get_scope)
964
self._transport = transport
965
self._filemode = filemode
967
_read_weave_v5(self._transport.get(name + WeaveFile.WEAVE_SUFFIX), self)
968
except errors.NoSuchFile:
974
def _add_lines(self, version_id, parents, lines, parent_texts,
975
left_matching_blocks, nostore_sha, random_id, check_content):
976
"""Add a version and save the weave."""
977
self.check_not_reserved_id(version_id)
978
result = super(WeaveFile, self)._add_lines(version_id, parents, lines,
979
parent_texts, left_matching_blocks, nostore_sha, random_id,
984
def copy_to(self, name, transport):
985
"""See VersionedFile.copy_to()."""
986
# as we are all in memory always, just serialise to the new place.
988
write_weave_v5(self, sio)
990
transport.put_file(name + WeaveFile.WEAVE_SUFFIX, sio, self._filemode)
993
"""Save the weave."""
994
self._check_write_ok()
996
write_weave_v5(self, sio)
998
self._transport.put_file(self._weave_name + WeaveFile.WEAVE_SUFFIX,
1004
"""See VersionedFile.get_suffixes()."""
1005
return [WeaveFile.WEAVE_SUFFIX]
1007
def join(self, other, pb=None, msg=None, version_ids=None,
1008
ignore_missing=False):
1009
"""Join other into self and save."""
1010
super(WeaveFile, self).join(other, pb, msg, version_ids, ignore_missing)
1014
def _reweave(wa, wb, pb=None, msg=None):
1015
"""Combine two weaves and return the result.
1017
This works even if a revision R has different parents in
1018
wa and wb. In the resulting weave all the parents are given.
1020
This is done by just building up a new weave, maintaining ordering
1021
of the versions in the two inputs. More efficient approaches
1022
might be possible but it should only be necessary to do
1023
this operation rarely, when a new previously ghost version is
1026
:param pb: An optional progress bar, indicating how far done we are
1027
:param msg: An optional message for the progress
1031
queue_a = range(wa.num_versions())
1032
queue_b = range(wb.num_versions())
1033
# first determine combined parents of all versions
1034
# map from version name -> all parent names
1035
combined_parents = _reweave_parent_graphs(wa, wb)
1036
mutter("combined parents: %r", combined_parents)
1037
order = topo_sort(combined_parents.iteritems())
1038
mutter("order to reweave: %r", order)
1043
for idx, name in enumerate(order):
1045
pb.update(msg, idx, len(order))
1046
if name in wa._name_map:
1047
lines = wa.get_lines(name)
1048
if name in wb._name_map:
1049
lines_b = wb.get_lines(name)
1050
if lines != lines_b:
1051
mutter('Weaves differ on content. rev_id {%s}', name)
1052
mutter('weaves: %s, %s', wa._weave_name, wb._weave_name)
1054
lines = list(difflib.unified_diff(lines, lines_b,
1055
wa._weave_name, wb._weave_name))
1056
mutter('lines:\n%s', ''.join(lines))
1057
raise errors.WeaveTextDiffers(name, wa, wb)
1059
lines = wb.get_lines(name)
1060
wr._add(name, lines, [wr._lookup(i) for i in combined_parents[name]])
1063
def _reweave_parent_graphs(wa, wb):
1064
"""Return combined parent ancestry for two weaves.
1066
Returned as a list of (version_name, set(parent_names))"""
1068
for weave in [wa, wb]:
1069
for idx, name in enumerate(weave._names):
1070
p = combined.setdefault(name, set())
1071
p.update(map(weave._idx_to_name, weave._parents[idx]))
1076
"""Show the weave's table-of-contents"""
1077
print '%6s %50s %10s %10s' % ('ver', 'name', 'sha1', 'parents')
1078
for i in (6, 50, 10, 10):
679
for i in range(w.numversions()):
1081
for i in range(w.num_versions()):
680
1082
sha1 = w._sha1s[i]
681
print '%6d %40s %s' % (i, sha1, ' '.join(map(str, w._parents[i])))
685
def weave_stats(weave_file):
686
from bzrlib.progress import ProgressBar
1084
parent_str = ' '.join(map(str, w._parents[i]))
1085
print '%6d %-50.50s %10.10s %s' % (i, name, sha1, parent_str)
1089
def weave_stats(weave_file, pb):
687
1090
from bzrlib.weavefile import read_weave
691
1092
wf = file(weave_file, 'rb')
692
1093
w = read_weave(wf)
693
1094
# FIXME: doesn't work on pipes