160
172
each version; the parent's parents are implied.
163
List of hex SHA-1 of each version, or None if not recorded.
175
List of hex SHA-1 of each version.
178
List of symbolic names for each version. Each should be unique.
181
For each name, the version number.
184
Descriptive name of this weave; typically the filename if known.
166
__slots__ = ['_weave', '_parents', '_sha1s']
188
__slots__ = ['_weave', '_parents', '_sha1s', '_names', '_name_map',
189
'_weave_name', '_matcher']
191
def __init__(self, weave_name=None, access_mode='w', matcher=None):
192
super(Weave, self).__init__(access_mode)
170
194
self._parents = []
198
self._weave_name = weave_name
200
self._matcher = bzrlib.patiencediff.PatienceSequenceMatcher
202
self._matcher = matcher
205
return "Weave(%r)" % self._weave_name
208
"""Return a deep copy of self.
210
The copy can be modified without affecting the original weave."""
212
other._weave = self._weave[:]
213
other._parents = self._parents[:]
214
other._sha1s = self._sha1s[:]
215
other._names = self._names[:]
216
other._name_map = self._name_map.copy()
217
other._weave_name = self._weave_name
174
220
def __eq__(self, other):
175
221
if not isinstance(other, Weave):
177
223
return self._parents == other._parents \
178
and self._weave == other._weave
224
and self._weave == other._weave \
225
and self._sha1s == other._sha1s
181
227
def __ne__(self, other):
182
228
return not self.__eq__(other)
185
def add(self, parents, text):
230
def _idx_to_name(self, version):
231
return self._names[version]
233
def _lookup(self, name):
234
"""Convert symbolic version name to index."""
235
self.check_not_reserved_id(name)
237
return self._name_map[name]
239
raise RevisionNotPresent(name, self._weave_name)
242
"""See VersionedFile.versions."""
243
return self._names[:]
245
def has_version(self, version_id):
246
"""See VersionedFile.has_version."""
247
return (version_id in self._name_map)
249
__contains__ = has_version
251
def get_parent_map(self, version_ids):
252
"""See VersionedFile.get_parent_map."""
254
for version_id in version_ids:
256
result[version_id] = tuple(
257
map(self._idx_to_name, self._parents[self._lookup(version_id)]))
258
except RevisionNotPresent:
262
def get_parents_with_ghosts(self, version_id):
263
raise NotImplementedError(self.get_parents_with_ghosts)
265
def _check_repeated_add(self, name, parents, text, sha1):
266
"""Check that a duplicated add is OK.
268
If it is, return the (old) index; otherwise raise an exception.
270
idx = self._lookup(name)
271
if sorted(self._parents[idx]) != sorted(parents) \
272
or sha1 != self._sha1s[idx]:
273
raise RevisionAlreadyPresent(name, self._weave_name)
276
def _add_lines(self, version_id, parents, lines, parent_texts,
277
left_matching_blocks, nostore_sha, random_id, check_content):
278
"""See VersionedFile.add_lines."""
279
idx = self._add(version_id, lines, map(self._lookup, parents),
280
nostore_sha=nostore_sha)
281
return sha_strings(lines), sum(map(len, lines)), idx
283
def _add(self, version_id, lines, parents, sha1=None, nostore_sha=None):
186
284
"""Add a single text on top of the weave.
188
286
Returns the index number of the newly added version.
289
Symbolic name for this version.
290
(Typically the revision-id of the revision that added it.)
191
293
List or set of direct parent version numbers.
194
Sequence of lines to be added in the new version."""
296
Sequence of lines to be added in the new version.
298
:param nostore_sha: See VersionedFile.add_lines.
300
assert isinstance(version_id, basestring)
301
self._check_lines_not_unicode(lines)
302
self._check_lines_are_lines(lines)
304
sha1 = sha_strings(lines)
305
if sha1 == nostore_sha:
306
raise errors.ExistingContent
307
if version_id in self._name_map:
308
return self._check_repeated_add(version_id, parents, lines, sha1)
196
310
self._check_versions(parents)
197
## self._check_lines(text)
311
## self._check_lines(lines)
198
312
new_version = len(self._parents)
206
# if we abort after here the weave will be corrupt
207
self._parents.append(frozenset(parents))
314
# if we abort after here the (in-memory) weave will be corrupt because only
315
# some fields are updated
316
# XXX: FIXME implement a succeed-or-fail of the rest of this routine.
317
# - Robert Collins 20060226
318
self._parents.append(parents[:])
208
319
self._sha1s.append(sha1)
320
self._names.append(version_id)
321
self._name_map[version_id] = new_version
446
assert isinstance(l, basestring)
639
assert l.__class__ in (str, unicode)
447
640
if isactive is None:
448
641
isactive = (not dset) and istack and (istack[-1] in included)
450
643
result.append((istack[-1], lineno, l))
454
raise WFE("unclosed insertion blocks at end of weave",
646
raise WeaveFormatError("unclosed insertion blocks "
647
"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):
649
raise WeaveFormatError("unclosed deletion blocks at end of weave: %s"
653
def _maybe_lookup(self, name_or_index):
654
"""Convert possible symbolic name to index, or pass through indexes.
658
if isinstance(name_or_index, (int, long)):
661
return self._lookup(name_or_index)
663
def get_lines(self, version_id):
664
"""See VersionedFile.get_lines()."""
665
int_index = self._maybe_lookup(version_id)
666
result = [line for (origin, lineno, line) in self._extract([int_index])]
667
expected_sha1 = self._sha1s[int_index]
668
measured_sha1 = sha_strings(result)
669
if measured_sha1 != expected_sha1:
670
raise errors.WeaveInvalidChecksum(
671
'file %s, revision %s, expected: %s, measured %s'
672
% (self._weave_name, version_id,
673
expected_sha1, measured_sha1))
676
def get_sha1(self, version_id):
677
"""See VersionedFile.get_sha1()."""
678
return self._sha1s[self._lookup(version_id)]
680
def get_sha1s(self, version_ids):
681
"""See VersionedFile.get_sha1s()."""
682
return [self._sha1s[self._lookup(v)] for v in version_ids]
684
def num_versions(self):
685
"""How many versions are in this weave?"""
490
686
l = len(self._parents)
491
687
assert l == len(self._sha1s)
496
return self.numversions()
690
__len__ = num_versions
499
692
def check(self, progress_bar=None):
500
# check no circular inclusions
501
for version in range(self.numversions()):
693
# TODO evaluate performance hit of using string sets in this routine.
694
# TODO: check no circular inclusions
695
# TODO: create a nested progress bar
696
for version in range(self.num_versions()):
502
697
inclusions = list(self._parents[version])
504
699
inclusions.sort()
506
701
raise WeaveFormatError("invalid included version %d for index %d"
507
702
% (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):
704
# try extracting all versions; parallel extraction is used
705
nv = self.num_versions()
710
# For creating the ancestry, IntSet is much faster (3.7s vs 0.17s)
711
# The problem is that set membership is much more expensive
712
name = self._idx_to_name(i)
713
sha1s[name] = sha.new()
715
new_inc = set([name])
716
for p in self._parents[i]:
717
new_inc.update(inclusions[self._idx_to_name(p)])
719
assert set(new_inc) == set(self.get_ancestry(name)), \
720
'failed %s != %s' % (set(new_inc), set(self.get_ancestry(name)))
721
inclusions[name] = new_inc
723
nlines = len(self._weave)
725
update_text = 'checking weave'
727
short_name = os.path.basename(self._weave_name)
728
update_text = 'checking %s' % (short_name,)
729
update_text = update_text[:25]
731
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]
733
progress_bar.update(update_text, lineno, nlines)
735
for name, name_inclusions in inclusions.items():
736
# The active inclusion must be an ancestor,
737
# and no ancestors must have deleted this line,
738
# because we don't support resurrection.
739
if (insert in name_inclusions) and not (deleteset & name_inclusions):
740
sha1s[name].update(line)
743
version = self._idx_to_name(i)
744
hd = sha1s[version].hexdigest()
745
expected = self._sha1s[i]
521
746
if hd != expected:
522
raise WeaveError("mismatched sha1 for version %d; "
523
"got %s, expected %s"
524
% (version, hd, expected))
747
raise errors.WeaveInvalidChecksum(
748
"mismatched sha1 for version %s: "
749
"got %s, expected %s"
750
% (version, hd, expected))
526
752
# TODO: check insertions are properly nested, that there are
527
753
# no lines outside of insertion blocks, that deletions are
528
754
# 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):
756
def _join(self, other, pb, msg, version_ids, ignore_missing):
757
"""Worker routine for join()."""
758
if not other.versions():
759
return # nothing to update, easy
762
# versions is never none, InterWeave checks this.
765
# two loops so that we do not change ourselves before verifying it
767
# work through in index order to make sure we get all dependencies
770
# get the selected versions only that are in other.versions.
771
version_ids = set(other.versions()).intersection(set(version_ids))
772
# pull in the referenced graph.
773
version_ids = other.get_ancestry(version_ids)
774
pending_parents = other.get_parent_map(version_ids)
775
pending_graph = pending_parents.items()
776
if len(pending_graph) != len(version_ids):
777
raise RevisionNotPresent(
778
set(version_ids) - set(pending_parents.keys()), self)
779
for name in tsort.topo_sort(pending_graph):
780
other_idx = other._name_map[name]
781
# returns True if we have it, False if we need it.
782
if not self._check_version_consistent(other, other_idx, name):
783
names_to_join.append((other_idx, name))
791
for other_idx, name in names_to_join:
792
# TODO: If all the parents of the other version are already
793
# present then we can avoid some work by just taking the delta
794
# and adjusting the offsets.
795
new_parents = self._imported_parents(other, other_idx)
796
sha1 = other._sha1s[other_idx]
801
pb.update(msg, merged, len(names_to_join))
803
lines = other.get_lines(other_idx)
804
self._add(name, lines, new_parents, sha1)
806
mutter("merged = %d, processed = %d, file_id=%s; deltat=%d"%(
807
merged, processed, self._weave_name, time.time()-time0))
809
def _imported_parents(self, other, other_idx):
810
"""Return list of parents in self corresponding to indexes in other."""
812
for parent_idx in other._parents[other_idx]:
813
parent_name = other._names[parent_idx]
814
if parent_name not in self._name_map:
815
# should not be possible
816
raise WeaveError("missing parent {%s} of {%s} in %r"
817
% (parent_name, other._name_map[other_idx], self))
818
new_parents.append(self._name_map[parent_name])
821
def _check_version_consistent(self, other, other_idx, name):
822
"""Check if a version in consistent in this and other.
824
To be consistent it must have:
827
* the same direct parents (by name, not index, and disregarding
830
If present & correct return True;
831
if not present in self return False;
832
if inconsistent raise error."""
833
this_idx = self._name_map.get(name, -1)
835
if self._sha1s[this_idx] != other._sha1s[other_idx]:
836
raise errors.WeaveTextDiffers(name, self, other)
837
self_parents = self._parents[this_idx]
838
other_parents = other._parents[other_idx]
839
n1 = set([self._names[i] for i in self_parents])
840
n2 = set([other._names[i] for i in other_parents])
841
if not self._compatible_parents(n1, n2):
842
raise WeaveParentMismatch("inconsistent parents "
843
"for version {%s}: %s vs %s" % (name, n1, n2))
849
def _reweave(self, other, pb, msg):
850
"""Reweave self with other - internal helper for join().
852
:param other: The other weave to merge
853
:param pb: An optional progress bar, indicating how far done we are
854
:param msg: An optional message for the progress
856
new_weave = _reweave(self, other, pb=pb, msg=msg)
857
self._copy_weave_content(new_weave)
859
def _copy_weave_content(self, otherweave):
860
"""adsorb the content from otherweave."""
861
for attr in self.__slots__:
862
if attr != '_weave_name':
863
setattr(self, attr, copy(getattr(otherweave, attr)))
866
class WeaveFile(Weave):
867
"""A WeaveFile represents a Weave on disk and writes on change."""
869
WEAVE_SUFFIX = '.weave'
871
def __init__(self, name, transport, filemode=None, create=False, access_mode='w'):
872
"""Create a WeaveFile.
874
:param create: If not True, only open an existing knit.
876
super(WeaveFile, self).__init__(name, access_mode)
877
self._transport = transport
878
self._filemode = filemode
880
_read_weave_v5(self._transport.get(name + WeaveFile.WEAVE_SUFFIX), self)
881
except errors.NoSuchFile:
887
def _add_lines(self, version_id, parents, lines, parent_texts,
888
left_matching_blocks, nostore_sha, random_id, check_content):
889
"""Add a version and save the weave."""
890
self.check_not_reserved_id(version_id)
891
result = super(WeaveFile, self)._add_lines(version_id, parents, lines,
892
parent_texts, left_matching_blocks, nostore_sha, random_id,
897
def _clone_text(self, new_version_id, old_version_id, parents):
898
"""See VersionedFile.clone_text."""
899
super(WeaveFile, self)._clone_text(new_version_id, old_version_id, parents)
902
def copy_to(self, name, transport):
903
"""See VersionedFile.copy_to()."""
904
# as we are all in memory always, just serialise to the new place.
906
write_weave_v5(self, sio)
908
transport.put_file(name + WeaveFile.WEAVE_SUFFIX, sio, self._filemode)
910
def create_empty(self, name, transport, filemode=None):
911
return WeaveFile(name, transport, filemode, create=True)
914
"""Save the weave."""
915
self._check_write_ok()
917
write_weave_v5(self, sio)
919
self._transport.put_file(self._weave_name + WeaveFile.WEAVE_SUFFIX,
925
"""See VersionedFile.get_suffixes()."""
926
return [WeaveFile.WEAVE_SUFFIX]
928
def join(self, other, pb=None, msg=None, version_ids=None,
929
ignore_missing=False):
930
"""Join other into self and save."""
931
super(WeaveFile, self).join(other, pb, msg, version_ids, ignore_missing)
935
def _reweave(wa, wb, pb=None, msg=None):
936
"""Combine two weaves and return the result.
938
This works even if a revision R has different parents in
939
wa and wb. In the resulting weave all the parents are given.
941
This is done by just building up a new weave, maintaining ordering
942
of the versions in the two inputs. More efficient approaches
943
might be possible but it should only be necessary to do
944
this operation rarely, when a new previously ghost version is
947
:param pb: An optional progress bar, indicating how far done we are
948
:param msg: An optional message for the progress
952
queue_a = range(wa.num_versions())
953
queue_b = range(wb.num_versions())
954
# first determine combined parents of all versions
955
# map from version name -> all parent names
956
combined_parents = _reweave_parent_graphs(wa, wb)
957
mutter("combined parents: %r", combined_parents)
958
order = tsort.topo_sort(combined_parents.iteritems())
959
mutter("order to reweave: %r", order)
964
for idx, name in enumerate(order):
966
pb.update(msg, idx, len(order))
967
if name in wa._name_map:
968
lines = wa.get_lines(name)
969
if name in wb._name_map:
970
lines_b = wb.get_lines(name)
972
mutter('Weaves differ on content. rev_id {%s}', name)
973
mutter('weaves: %s, %s', wa._weave_name, wb._weave_name)
975
lines = list(difflib.unified_diff(lines, lines_b,
976
wa._weave_name, wb._weave_name))
977
mutter('lines:\n%s', ''.join(lines))
978
raise errors.WeaveTextDiffers(name, wa, wb)
980
lines = wb.get_lines(name)
981
wr._add(name, lines, [wr._lookup(i) for i in combined_parents[name]])
984
def _reweave_parent_graphs(wa, wb):
985
"""Return combined parent ancestry for two weaves.
987
Returned as a list of (version_name, set(parent_names))"""
989
for weave in [wa, wb]:
990
for idx, name in enumerate(weave._names):
991
p = combined.setdefault(name, set())
992
p.update(map(weave._idx_to_name, weave._parents[idx]))
997
"""Show the weave's table-of-contents"""
998
print '%6s %50s %10s %10s' % ('ver', 'name', 'sha1', 'parents')
999
for i in (6, 50, 10, 10):
679
for i in range(w.numversions()):
1002
for i in range(w.num_versions()):
680
1003
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
1005
parent_str = ' '.join(map(str, w._parents[i]))
1006
print '%6d %-50.50s %10.10s %s' % (i, name, sha1, parent_str)
1010
def weave_stats(weave_file, pb):
687
1011
from bzrlib.weavefile import read_weave
691
1013
wf = file(weave_file, 'rb')
692
1014
w = read_weave(wf)
693
1015
# FIXME: doesn't work on pipes