205
270
return self._parents == other._parents \
206
271
and self._weave == other._weave \
207
and self._sha1s == other._sha1s
272
and self._sha1s == other._sha1s
210
274
def __ne__(self, other):
211
275
return not self.__eq__(other)
214
def maybe_lookup(self, name_or_index):
215
"""Convert possible symbolic name to index, or pass through indexes."""
216
if isinstance(name_or_index, (int, long)):
219
return self.lookup(name_or_index)
222
def lookup(self, name):
277
def _idx_to_name(self, version):
278
return self._names[version]
280
def _lookup(self, name):
223
281
"""Convert symbolic version name to index."""
282
if not self._allow_reserved:
283
self.check_not_reserved_id(name)
225
285
return self._name_map[name]
227
raise WeaveError("name %r not present in weave %r" %
228
(name, self._weave_name))
231
def iter_names(self):
232
"""Yield a list of all names in this weave."""
233
return iter(self._names)
235
def idx_to_name(self, version):
236
return self._names[version]
287
raise RevisionNotPresent(name, self._weave_name)
290
"""See VersionedFile.versions."""
291
return self._names[:]
293
def has_version(self, version_id):
294
"""See VersionedFile.has_version."""
295
return (version_id in self._name_map)
297
__contains__ = has_version
299
def get_record_stream(self, versions, ordering, include_delta_closure):
300
"""Get a stream of records for versions.
302
:param versions: The versions to include. Each version is a tuple
304
:param ordering: Either 'unordered' or 'topological'. A topologically
305
sorted stream has compression parents strictly before their
307
:param include_delta_closure: If True then the closure across any
308
compression parents will be included (in the opaque data).
309
:return: An iterator of ContentFactory objects, each of which is only
310
valid until the iterator is advanced.
312
versions = [version[-1] for version in versions]
313
if ordering == 'topological':
314
parents = self.get_parent_map(versions)
315
new_versions = tsort.topo_sort(parents)
316
new_versions.extend(set(versions).difference(set(parents)))
317
versions = new_versions
318
elif ordering == 'groupcompress':
319
parents = self.get_parent_map(versions)
320
new_versions = sort_groupcompress(parents)
321
new_versions.extend(set(versions).difference(set(parents)))
322
versions = new_versions
323
for version in versions:
325
yield WeaveContentFactory(version, self)
327
yield AbsentContentFactory((version,))
329
def get_parent_map(self, version_ids):
330
"""See VersionedFile.get_parent_map."""
332
for version_id in version_ids:
333
if version_id == NULL_REVISION:
338
map(self._idx_to_name,
339
self._parents[self._lookup(version_id)]))
340
except RevisionNotPresent:
342
result[version_id] = parents
345
def get_parents_with_ghosts(self, version_id):
346
raise NotImplementedError(self.get_parents_with_ghosts)
348
def insert_record_stream(self, stream):
349
"""Insert a record stream into this versioned file.
351
:param stream: A stream of records to insert.
353
:seealso VersionedFile.get_record_stream:
356
for record in stream:
357
# Raise an error when a record is missing.
358
if record.storage_kind == 'absent':
359
raise RevisionNotPresent([record.key[0]], self)
360
# adapt to non-tuple interface
361
parents = [parent[0] for parent in record.parents]
362
if (record.storage_kind == 'fulltext'
363
or record.storage_kind == 'chunked'):
364
self.add_lines(record.key[0], parents,
365
osutils.chunks_to_lines(record.get_bytes_as('chunked')))
367
adapter_key = record.storage_kind, 'fulltext'
369
adapter = adapters[adapter_key]
371
adapter_factory = adapter_registry.get(adapter_key)
372
adapter = adapter_factory(self)
373
adapters[adapter_key] = adapter
374
lines = split_lines(adapter.get_bytes(record))
376
self.add_lines(record.key[0], parents, lines)
377
except RevisionAlreadyPresent:
239
380
def _check_repeated_add(self, name, parents, text, sha1):
240
381
"""Check that a duplicated add is OK.
242
383
If it is, return the (old) index; otherwise raise an exception.
244
idx = self.lookup(name)
245
if sorted(self._parents[idx]) != sorted(parents):
246
raise WeaveError("name \"%s\" already present in weave "
247
"with different parents" % name)
248
if sha1 != self._sha1s[idx]:
249
raise WeaveError("name \"%s\" already present in weave "
250
"with different text" % name)
385
idx = self._lookup(name)
386
if sorted(self._parents[idx]) != sorted(parents) \
387
or sha1 != self._sha1s[idx]:
388
raise RevisionAlreadyPresent(name, self._weave_name)
255
def add(self, name, parents, text, sha1=None):
391
def _add_lines(self, version_id, parents, lines, parent_texts,
392
left_matching_blocks, nostore_sha, random_id, check_content):
393
"""See VersionedFile.add_lines."""
394
idx = self._add(version_id, lines, map(self._lookup, parents),
395
nostore_sha=nostore_sha)
396
return sha_strings(lines), sum(map(len, lines)), idx
398
def _add(self, version_id, lines, parents, sha1=None, nostore_sha=None):
256
399
"""Add a single text on top of the weave.
258
401
Returns the index number of the newly added version.
261
404
Symbolic name for this version.
262
405
(Typically the revision-id of the revision that added it.)
406
If None, a name will be allocated based on the hash. (sha1:SHAHASH)
265
409
List or set of direct parent version numbers.
268
412
Sequence of lines to be added in the new version.
270
sha -- SHA-1 of the file, if known. This is trusted to be
414
:param nostore_sha: See VersionedFile.add_lines.
273
from bzrlib.osutils import sha_strings
275
assert isinstance(name, basestring)
277
sha1 = sha_strings(text)
278
if name in self._name_map:
279
return self._check_repeated_add(name, parents, text, sha1)
281
parents = map(self.maybe_lookup, parents)
416
self._check_lines_not_unicode(lines)
417
self._check_lines_are_lines(lines)
419
sha1 = sha_strings(lines)
420
if sha1 == nostore_sha:
421
raise errors.ExistingContent
422
if version_id is None:
423
version_id = "sha1:" + sha1
424
if version_id in self._name_map:
425
return self._check_repeated_add(version_id, parents, lines, sha1)
282
427
self._check_versions(parents)
283
## self._check_lines(text)
428
## self._check_lines(lines)
284
429
new_version = len(self._parents)
287
431
# if we abort after here the (in-memory) weave will be corrupt because only
288
432
# some fields are updated
433
# XXX: FIXME implement a succeed-or-fail of the rest of this routine.
434
# - Robert Collins 20060226
289
435
self._parents.append(parents[:])
290
436
self._sha1s.append(sha1)
291
self._names.append(name)
292
self._name_map[name] = new_version
437
self._names.append(version_id)
438
self._name_map[version_id] = new_version
296
442
# special case; adding with no parents revision; can do
297
443
# this more quickly by just appending unconditionally.
298
444
# even more specially, if we're adding an empty text we
299
445
# need do nothing at all.
301
447
self._weave.append(('{', new_version))
302
self._weave.extend(text)
448
self._weave.extend(lines)
303
449
self._weave.append(('}', None))
305
450
return new_version
307
452
if len(parents) == 1:
518
688
WFE = WeaveFormatError
691
# 449 0 4474.6820 2356.5590 bzrlib.weave:556(_extract)
692
# +285282 0 1676.8040 1676.8040 +<isinstance>
693
# 1.6 seconds in 'isinstance'.
694
# changing the first isinstance:
695
# 449 0 2814.2660 1577.1760 bzrlib.weave:556(_extract)
696
# +140414 0 762.8050 762.8050 +<isinstance>
697
# note that the inline time actually dropped (less function calls)
698
# and total processing time was halved.
699
# we're still spending ~1/4 of the method in isinstance though.
700
# so lets hard code the acceptable string classes we expect:
701
# 449 0 1202.9420 786.2930 bzrlib.weave:556(_extract)
702
# +71352 0 377.5560 377.5560 +<method 'append' of 'list'
704
# yay, down to ~1/4 the initial extract time, and our inline time
705
# has shrunk again, with isinstance no longer dominating.
706
# tweaking the stack inclusion test to use a set gives:
707
# 449 0 1122.8030 713.0080 bzrlib.weave:556(_extract)
708
# +71352 0 354.9980 354.9980 +<method 'append' of 'list'
710
# - a 5% win, or possibly just noise. However with large istacks that
711
# 'in' test could dominate, so I'm leaving this change in place -
712
# when its fast enough to consider profiling big datasets we can review.
520
717
for l in self._weave:
521
if isinstance(l, tuple):
718
if l.__class__ == tuple:
525
assert v not in istack
725
iset.remove(istack.pop())
530
727
if v in included:
535
730
if v in included:
733
raise AssertionError()
539
assert isinstance(l, basestring)
540
735
if isactive is None:
541
736
isactive = (not dset) and istack and (istack[-1] in included)
543
738
result.append((istack[-1], lineno, l))
547
raise WFE("unclosed insertion blocks at end of weave",
741
raise WeaveFormatError("unclosed insertion blocks "
742
"at end of weave: %s" % istack)
550
raise WFE("unclosed deletion blocks at end of weave",
557
def get_iter(self, name_or_index):
558
"""Yield lines for the specified version."""
559
incls = [self.maybe_lookup(name_or_index)]
560
for origin, lineno, line in self._extract(incls):
564
def get_text(self, name_or_index):
565
return ''.join(self.get_iter(name_or_index))
566
assert isinstance(version, int)
569
def get_lines(self, name_or_index):
570
return list(self.get_iter(name_or_index))
576
def mash_iter(self, included):
577
"""Return composed version of multiple included versions."""
578
included = map(self.maybe_lookup, included)
579
for origin, lineno, text in self._extract(included):
583
def dump(self, to_file):
584
from pprint import pprint
585
print >>to_file, "Weave._weave = ",
586
pprint(self._weave, to_file)
587
print >>to_file, "Weave._parents = ",
588
pprint(self._parents, to_file)
592
def numversions(self):
744
raise WeaveFormatError("unclosed deletion blocks at end of weave: %s"
748
def _maybe_lookup(self, name_or_index):
749
"""Convert possible symbolic name to index, or pass through indexes.
753
if isinstance(name_or_index, (int, long)):
756
return self._lookup(name_or_index)
758
def get_lines(self, version_id):
759
"""See VersionedFile.get_lines()."""
760
int_index = self._maybe_lookup(version_id)
761
result = [line for (origin, lineno, line) in self._extract([int_index])]
762
expected_sha1 = self._sha1s[int_index]
763
measured_sha1 = sha_strings(result)
764
if measured_sha1 != expected_sha1:
765
raise errors.WeaveInvalidChecksum(
766
'file %s, revision %s, expected: %s, measured %s'
767
% (self._weave_name, version_id,
768
expected_sha1, measured_sha1))
771
def get_sha1s(self, version_ids):
772
"""See VersionedFile.get_sha1s()."""
774
for v in version_ids:
775
result[v] = self._sha1s[self._lookup(v)]
778
def num_versions(self):
779
"""How many versions are in this weave?"""
593
780
l = len(self._parents)
594
assert l == len(self._sha1s)
599
return self.numversions()
783
__len__ = num_versions
602
785
def check(self, progress_bar=None):
603
# check no circular inclusions
604
for version in range(self.numversions()):
786
# TODO evaluate performance hit of using string sets in this routine.
787
# TODO: check no circular inclusions
788
# TODO: create a nested progress bar
789
for version in range(self.num_versions()):
605
790
inclusions = list(self._parents[version])
607
792
inclusions.sort()
609
794
raise WeaveFormatError("invalid included version %d for index %d"
610
795
% (inclusions[-1], version))
612
# try extracting all versions; this is a bit slow and parallel
613
# extraction could be used
614
nv = self.numversions()
615
for version in range(nv):
797
# try extracting all versions; parallel extraction is used
798
nv = self.num_versions()
803
# For creating the ancestry, IntSet is much faster (3.7s vs 0.17s)
804
# The problem is that set membership is much more expensive
805
name = self._idx_to_name(i)
808
new_inc = set([name])
809
for p in self._parents[i]:
810
new_inc.update(inclusions[self._idx_to_name(p)])
812
if set(new_inc) != set(self.get_ancestry(name)):
813
raise AssertionError(
815
% (set(new_inc), set(self.get_ancestry(name))))
816
inclusions[name] = new_inc
818
nlines = len(self._weave)
820
update_text = 'checking weave'
822
short_name = os.path.basename(self._weave_name)
823
update_text = 'checking %s' % (short_name,)
824
update_text = update_text[:25]
826
for lineno, insert, deleteset, line in self._walk_internal():
617
progress_bar.update('checking text', version, nv)
619
for l in self.get_iter(version):
622
expected = self._sha1s[version]
828
progress_bar.update(update_text, lineno, nlines)
830
for name, name_inclusions in inclusions.items():
831
# The active inclusion must be an ancestor,
832
# and no ancestors must have deleted this line,
833
# because we don't support resurrection.
834
if (insert in name_inclusions) and not (deleteset & name_inclusions):
835
sha1s[name].update(line)
838
version = self._idx_to_name(i)
839
hd = sha1s[version].hexdigest()
840
expected = self._sha1s[i]
623
841
if hd != expected:
624
raise WeaveError("mismatched sha1 for version %d; "
625
"got %s, expected %s"
626
% (version, hd, expected))
842
raise errors.WeaveInvalidChecksum(
843
"mismatched sha1 for version %s: "
844
"got %s, expected %s"
845
% (version, hd, expected))
628
847
# TODO: check insertions are properly nested, that there are
629
848
# no lines outside of insertion blocks, that deletions are
630
849
# properly paired, etc.
634
def merge(self, merge_versions):
635
"""Automerge and mark conflicts between versions.
637
This returns a sequence, each entry describing alternatives
638
for a chunk of the file. Each of the alternatives is given as
641
If there is a chunk of the file where there's no diagreement,
642
only one alternative is given.
644
# approach: find the included versions common to all the
646
raise NotImplementedError()
650
def _delta(self, included, lines):
651
"""Return changes from basis to new revision.
653
The old text for comparison is the union of included revisions.
655
This is used in inserting a new text.
657
Delta is returned as a sequence of
658
(weave1, weave2, newlines).
660
This indicates that weave1:weave2 of the old weave should be
661
replaced by the sequence of lines in newlines. Note that
662
these line numbers are positions in the total weave and don't
663
correspond to the lines in any extracted version, or even the
664
extracted union of included versions.
666
If line1=line2, this is a pure insert; if newlines=[] this is a
667
pure delete. (Similar to difflib.)
669
raise NotImplementedError()
672
def plan_merge(self, ver_a, ver_b):
673
"""Return pseudo-annotation indicating how the two versions merge.
675
This is computed between versions a and b and their common
678
Weave lines present in none of them are skipped entirely.
680
inc_a = self.inclusions([ver_a])
681
inc_b = self.inclusions([ver_b])
682
inc_c = inc_a & inc_b
684
for lineno, insert, deleteset, line in self._walk():
685
if deleteset & inc_c:
686
# killed in parent; can't be in either a or b
687
# not relevant to our work
688
yield 'killed-base', line
689
elif insert in inc_c:
690
# was inserted in base
691
killed_a = bool(deleteset & inc_a)
692
killed_b = bool(deleteset & inc_b)
693
if killed_a and killed_b:
694
yield 'killed-both', line
696
yield 'killed-a', line
698
yield 'killed-b', line
700
yield 'unchanged', line
701
elif insert in inc_a:
702
if deleteset & inc_a:
703
yield 'ghost-a', line
707
elif insert in inc_b:
708
if deleteset & inc_b:
709
yield 'ghost-b', line
713
# not in either revision
714
yield 'irrelevant', line
716
yield 'unchanged', '' # terminator
720
def weave_merge(self, plan):
725
for state, line in plan:
726
if state == 'unchanged' or state == 'killed-both':
727
# resync and flush queued conflicts changes if any
728
if not lines_a and not lines_b:
730
elif ch_a and not ch_b:
732
for l in lines_a: yield l
733
elif ch_b and not ch_a:
734
for l in lines_b: yield l
735
elif lines_a == lines_b:
736
for l in lines_a: yield l
739
for l in lines_a: yield l
741
for l in lines_b: yield l
748
if state == 'unchanged':
751
elif state == 'killed-a':
754
elif state == 'killed-b':
757
elif state == 'new-a':
760
elif state == 'new-b':
764
assert state in ('irrelevant', 'ghost-a', 'ghost-b', 'killed-base',
769
def join(self, other):
770
"""Integrate versions from other into this weave.
772
The resulting weave contains all the history of both weaves;
773
any version you could retrieve from either self or other can be
774
retrieved from self after this call.
776
It is illegal for the two weaves to contain different values
779
if other.numversions() == 0:
780
return # nothing to update, easy
781
# work through in index order to make sure we get all dependencies
782
for other_idx, name in enumerate(other._names):
783
# TODO: If all the parents of the other version are already
784
# present then we can avoid some work by just taking the delta
785
# and adjusting the offsets.
786
if self._check_version_consistent(other, other_idx, name):
788
new_parents = self._imported_parents(other, other_idx)
789
lines = other.get_lines(other_idx)
790
sha1 = other._sha1s[other_idx]
791
self.add(name, new_parents, lines, sha1)
794
851
def _imported_parents(self, other, other_idx):
795
852
"""Return list of parents in self corresponding to indexes in other."""
797
854
for parent_idx in other._parents[other_idx]:
798
855
parent_name = other._names[parent_idx]
799
if parent_name not in self._names:
856
if parent_name not in self._name_map:
800
857
# should not be possible
801
raise WeaveError("missing parent {%s} of {%s} in %r"
858
raise WeaveError("missing parent {%s} of {%s} in %r"
802
859
% (parent_name, other._name_map[other_idx], self))
803
860
new_parents.append(self._name_map[parent_name])
804
861
return new_parents
806
863
def _check_version_consistent(self, other, other_idx, name):
807
864
"""Check if a version in consistent in this and other.
866
To be consistent it must have:
869
* the same direct parents (by name, not index, and disregarding
809
872
If present & correct return True;
810
if not present in self return False;
873
if not present in self return False;
811
874
if inconsistent raise error."""
812
875
this_idx = self._name_map.get(name, -1)
813
876
if this_idx != -1:
814
877
if self._sha1s[this_idx] != other._sha1s[other_idx]:
815
raise WeaveError("inconsistent texts for version {%s} in %r and %r"
816
% (name, self, other))
817
elif set(self._parents[this_idx]) != set(other._parents[other_idx]):
818
raise WeaveError("inconsistent parents for version {%s} in %r and %r"
819
% (name, self, other))
878
raise errors.WeaveTextDiffers(name, self, other)
879
self_parents = self._parents[this_idx]
880
other_parents = other._parents[other_idx]
881
n1 = set([self._names[i] for i in self_parents])
882
n2 = set([other._names[i] for i in other_parents])
883
if not self._compatible_parents(n1, n2):
884
raise WeaveParentMismatch("inconsistent parents "
885
"for version {%s}: %s vs %s" % (name, n1, n2))
821
887
return True # ok!
827
"""Show the weave's table-of-contents"""
828
print '%6s %50s %10s %10s' % ('ver', 'name', 'sha1', 'parents')
829
for i in (6, 50, 10, 10):
832
for i in range(w.numversions()):
835
parent_str = ' '.join(map(str, w._parents[i]))
836
print '%6d %-50.50s %10.10s %s' % (i, name, sha1, parent_str)
840
def weave_stats(weave_file, pb):
841
from bzrlib.weavefile import read_weave
843
wf = file(weave_file, 'rb')
845
# FIXME: doesn't work on pipes
846
weave_size = wf.tell()
850
for i in range(vers):
851
pb.update('checking sizes', i, vers)
852
for origin, lineno, line in w._extract([i]):
857
print 'versions %9d' % vers
858
print 'weave file %9d bytes' % weave_size
859
print 'total contents %9d bytes' % total
860
print 'compression ratio %9.2fx' % (float(total) / float(weave_size))
863
print 'average size %9d bytes' % avg
864
print 'relative size %9.2fx' % (float(weave_size) / float(avg))
868
print """bzr weave tool
870
Experimental tool for weave algorithm.
874
Create an empty weave file
875
weave get WEAVEFILE VERSION
876
Write out specified version.
877
weave check WEAVEFILE
878
Check consistency of all versions.
880
Display table of contents.
881
weave add WEAVEFILE NAME [BASE...] < NEWTEXT
882
Add NEWTEXT, with specified parent versions.
883
weave annotate WEAVEFILE VERSION
884
Display origin of each line.
885
weave mash WEAVEFILE VERSION...
886
Display composite of all selected versions.
887
weave merge WEAVEFILE VERSION1 VERSION2 > OUT
888
Auto-merge two versions and display conflicts.
889
weave diff WEAVEFILE VERSION1 VERSION2
890
Show differences between two versions.
894
% weave init foo.weave
896
% weave add foo.weave ver0 < foo.txt
899
(create updated version)
901
% weave get foo.weave 0 | diff -u - foo.txt
902
% weave add foo.weave ver1 0 < foo.txt
905
% weave get foo.weave 0 > foo.txt (create forked version)
907
% weave add foo.weave ver2 0 < foo.txt
910
% weave merge foo.weave 1 2 > foo.txt (merge them)
911
% vi foo.txt (resolve conflicts)
912
% weave add foo.weave merged 1 2 < foo.txt (commit merged version)
924
# in case we're run directly from the subdirectory
925
sys.path.append('..')
927
from bzrlib.weavefile import write_weave, read_weave
928
from bzrlib.progress import ProgressBar
943
return read_weave(file(argv[2], 'rb'))
949
# at the moment, based on everything in the file
951
parents = map(int, argv[4:])
952
lines = sys.stdin.readlines()
953
ver = w.add(name, parents, lines)
954
write_weave(w, file(argv[2], 'wb'))
955
print 'added version %r %d' % (name, ver)
958
if os.path.exists(fn):
959
raise IOError("file exists")
961
write_weave(w, file(fn, 'wb'))
962
elif cmd == 'get': # get one version
964
sys.stdout.writelines(w.get_iter(int(argv[3])))
966
elif cmd == 'mash': # get composite
968
sys.stdout.writelines(w.mash_iter(map(int, argv[3:])))
971
from difflib import unified_diff
974
v1, v2 = map(int, argv[3:5])
977
diff_gen = unified_diff(lines1, lines2,
978
'%s version %d' % (fn, v1),
979
'%s version %d' % (fn, v2))
980
sys.stdout.writelines(diff_gen)
982
elif cmd == 'annotate':
984
# newline is added to all lines regardless; too hard to get
985
# reasonable formatting otherwise
987
for origin, text in w.annotate(int(argv[3])):
988
text = text.rstrip('\r\n')
990
print ' | %s' % (text)
992
print '%5d | %s' % (origin, text)
999
weave_stats(argv[2], ProgressBar())
1001
elif cmd == 'check':
1006
print '%d versions ok' % w.numversions()
1008
elif cmd == 'inclusions':
1010
print ' '.join(map(str, w.inclusions([int(argv[3])])))
1012
elif cmd == 'parents':
1014
print ' '.join(map(str, w._parents[int(argv[3])]))
1016
elif cmd == 'plan-merge':
1018
for state, line in w.plan_merge(int(argv[3]), int(argv[4])):
1020
print '%14s | %s' % (state, line),
1022
elif cmd == 'merge':
1024
p = w.plan_merge(int(argv[3]), int(argv[4]))
1025
sys.stdout.writelines(w.weave_merge(p))
1027
elif cmd == 'mash-merge':
1033
v1, v2 = map(int, argv[3:5])
1035
basis = w.inclusions([v1]).intersection(w.inclusions([v2]))
1037
base_lines = list(w.mash_iter(basis))
1038
a_lines = list(w.get(v1))
1039
b_lines = list(w.get(v2))
1041
from bzrlib.merge3 import Merge3
1042
m3 = Merge3(base_lines, a_lines, b_lines)
1044
name_a = 'version %d' % v1
1045
name_b = 'version %d' % v2
1046
sys.stdout.writelines(m3.merge_lines(name_a=name_a, name_b=name_b))
1048
raise ValueError('unknown command %r' % cmd)
1052
def profile_main(argv):
1053
import tempfile, hotshot, hotshot.stats
1055
prof_f = tempfile.NamedTemporaryFile()
1057
prof = hotshot.Profile(prof_f.name)
1059
ret = prof.runcall(main, argv)
1062
stats = hotshot.stats.load(prof_f.name)
1064
stats.sort_stats('cumulative')
1065
## XXX: Might like to write to stderr or the trace file instead but
1066
## print_stats seems hardcoded to stdout
1067
stats.print_stats(20)
1072
if __name__ == '__main__':
1074
if '--profile' in sys.argv:
1076
args.remove('--profile')
1077
sys.exit(profile_main(args))
1079
sys.exit(main(sys.argv))
891
def _reweave(self, other, pb, msg):
892
"""Reweave self with other - internal helper for join().
894
:param other: The other weave to merge
895
:param pb: An optional progress bar, indicating how far done we are
896
:param msg: An optional message for the progress
898
new_weave = _reweave(self, other, pb=pb, msg=msg)
899
self._copy_weave_content(new_weave)
901
def _copy_weave_content(self, otherweave):
902
"""adsorb the content from otherweave."""
903
for attr in self.__slots__:
904
if attr != '_weave_name':
905
setattr(self, attr, copy(getattr(otherweave, attr)))
908
class WeaveFile(Weave):
909
"""A WeaveFile represents a Weave on disk and writes on change."""
911
WEAVE_SUFFIX = '.weave'
913
def __init__(self, name, transport, filemode=None, create=False, access_mode='w', get_scope=None):
914
"""Create a WeaveFile.
916
:param create: If not True, only open an existing knit.
918
super(WeaveFile, self).__init__(name, access_mode, get_scope=get_scope,
919
allow_reserved=False)
920
self._transport = transport
921
self._filemode = filemode
923
f = self._transport.get(name + WeaveFile.WEAVE_SUFFIX)
924
_read_weave_v5(StringIO(f.read()), self)
925
except errors.NoSuchFile:
931
def _add_lines(self, version_id, parents, lines, parent_texts,
932
left_matching_blocks, nostore_sha, random_id, check_content):
933
"""Add a version and save the weave."""
934
self.check_not_reserved_id(version_id)
935
result = super(WeaveFile, self)._add_lines(version_id, parents, lines,
936
parent_texts, left_matching_blocks, nostore_sha, random_id,
941
def copy_to(self, name, transport):
942
"""See VersionedFile.copy_to()."""
943
# as we are all in memory always, just serialise to the new place.
945
write_weave_v5(self, sio)
947
transport.put_file(name + WeaveFile.WEAVE_SUFFIX, sio, self._filemode)
950
"""Save the weave."""
951
self._check_write_ok()
953
write_weave_v5(self, sio)
955
bytes = sio.getvalue()
956
path = self._weave_name + WeaveFile.WEAVE_SUFFIX
958
self._transport.put_bytes(path, bytes, self._filemode)
959
except errors.NoSuchFile:
960
self._transport.mkdir(dirname(path))
961
self._transport.put_bytes(path, bytes, self._filemode)
965
"""See VersionedFile.get_suffixes()."""
966
return [WeaveFile.WEAVE_SUFFIX]
968
def insert_record_stream(self, stream):
969
super(WeaveFile, self).insert_record_stream(stream)
973
def _reweave(wa, wb, pb=None, msg=None):
974
"""Combine two weaves and return the result.
976
This works even if a revision R has different parents in
977
wa and wb. In the resulting weave all the parents are given.
979
This is done by just building up a new weave, maintaining ordering
980
of the versions in the two inputs. More efficient approaches
981
might be possible but it should only be necessary to do
982
this operation rarely, when a new previously ghost version is
985
:param pb: An optional progress bar, indicating how far done we are
986
:param msg: An optional message for the progress
990
queue_a = range(wa.num_versions())
991
queue_b = range(wb.num_versions())
992
# first determine combined parents of all versions
993
# map from version name -> all parent names
994
combined_parents = _reweave_parent_graphs(wa, wb)
995
mutter("combined parents: %r", combined_parents)
996
order = tsort.topo_sort(combined_parents.iteritems())
997
mutter("order to reweave: %r", order)
1002
for idx, name in enumerate(order):
1004
pb.update(msg, idx, len(order))
1005
if name in wa._name_map:
1006
lines = wa.get_lines(name)
1007
if name in wb._name_map:
1008
lines_b = wb.get_lines(name)
1009
if lines != lines_b:
1010
mutter('Weaves differ on content. rev_id {%s}', name)
1011
mutter('weaves: %s, %s', wa._weave_name, wb._weave_name)
1013
lines = list(difflib.unified_diff(lines, lines_b,
1014
wa._weave_name, wb._weave_name))
1015
mutter('lines:\n%s', ''.join(lines))
1016
raise errors.WeaveTextDiffers(name, wa, wb)
1018
lines = wb.get_lines(name)
1019
wr._add(name, lines, [wr._lookup(i) for i in combined_parents[name]])
1023
def _reweave_parent_graphs(wa, wb):
1024
"""Return combined parent ancestry for two weaves.
1026
Returned as a list of (version_name, set(parent_names))"""
1028
for weave in [wa, wb]:
1029
for idx, name in enumerate(weave._names):
1030
p = combined.setdefault(name, set())
1031
p.update(map(weave._idx_to_name, weave._parents[idx]))