1
# Copyright (C) 2005-2010 Canonical Ltd
3
# This program is free software; you can redistribute it and/or modify
4
# it under the terms of the GNU General Public License as published by
5
# the Free Software Foundation; either version 2 of the License, or
6
# (at your option) any later version.
8
# This program is distributed in the hope that it will be useful,
9
# but WITHOUT ANY WARRANTY; without even the implied warranty of
10
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11
# GNU General Public License for more details.
13
# You should have received a copy of the GNU General Public License
14
# along with this program; if not, write to the Free Software
15
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20
branch as _mod_branch,
21
conflicts as _mod_conflicts,
30
revision as _mod_revision,
39
from bzrlib.cleanup import OperationWithCleanups
40
from bzrlib.symbol_versioning import (
44
# TODO: Report back as changes are merged in
47
def transform_tree(from_tree, to_tree, interesting_ids=None):
48
from_tree.lock_tree_write()
49
operation = OperationWithCleanups(merge_inner)
50
operation.add_cleanup(from_tree.unlock)
51
operation.run_simple(from_tree.branch, to_tree, from_tree,
52
ignore_zero=True, interesting_ids=interesting_ids, this_tree=from_tree)
55
class MergeHooks(hooks.Hooks):
58
hooks.Hooks.__init__(self)
59
self.create_hook(hooks.HookPoint('merge_file_content',
60
"Called with a bzrlib.merge.Merger object to create a per file "
61
"merge object when starting a merge. "
62
"Should return either None or a subclass of "
63
"``bzrlib.merge.AbstractPerFileMerger``. "
64
"Such objects will then be called per file "
65
"that needs to be merged (including when one "
66
"side has deleted the file and the other has changed it). "
67
"See the AbstractPerFileMerger API docs for details on how it is "
72
class AbstractPerFileMerger(object):
73
"""PerFileMerger objects are used by plugins extending merge for bzrlib.
75
See ``bzrlib.plugins.news_merge.news_merge`` for an example concrete class.
77
:ivar merger: The Merge3Merger performing the merge.
80
def __init__(self, merger):
81
"""Create a PerFileMerger for use with merger."""
84
def merge_contents(self, merge_params):
85
"""Attempt to merge the contents of a single file.
87
:param merge_params: A bzrlib.merge.MergeHookParams
88
:return : A tuple of (status, chunks), where status is one of
89
'not_applicable', 'success', 'conflicted', or 'delete'. If status
90
is 'success' or 'conflicted', then chunks should be an iterable of
91
strings for the new file contents.
93
return ('not applicable', None)
96
class ConfigurableFileMerger(AbstractPerFileMerger):
97
"""Merge individual files when configured via a .conf file.
99
This is a base class for concrete custom file merging logic. Concrete
100
classes should implement ``merge_text``.
102
See ``bzrlib.plugins.news_merge.news_merge`` for an example concrete class.
104
:ivar affected_files: The configured file paths to merge.
106
:cvar name_prefix: The prefix to use when looking up configuration
107
details. <name_prefix>_merge_files describes the files targeted by the
110
:cvar default_files: The default file paths to merge when no configuration
117
def __init__(self, merger):
118
super(ConfigurableFileMerger, self).__init__(merger)
119
self.affected_files = None
120
self.default_files = self.__class__.default_files or []
121
self.name_prefix = self.__class__.name_prefix
122
if self.name_prefix is None:
123
raise ValueError("name_prefix must be set.")
125
def filename_matches_config(self, params):
126
"""Check whether the file should call the merge hook.
128
<name_prefix>_merge_files configuration variable is a list of files
129
that should use the hook.
131
affected_files = self.affected_files
132
if affected_files is None:
133
config = self.merger.this_branch.get_config()
134
# Until bzr provides a better policy for caching the config, we
135
# just add the part we're interested in to the params to avoid
136
# reading the config files repeatedly (bazaar.conf, location.conf,
138
config_key = self.name_prefix + '_merge_files'
139
affected_files = config.get_user_option_as_list(config_key)
140
if affected_files is None:
141
# If nothing was specified in the config, use the default.
142
affected_files = self.default_files
143
self.affected_files = affected_files
145
filename = self.merger.this_tree.id2path(params.file_id)
146
if filename in affected_files:
150
def merge_contents(self, params):
151
"""Merge the contents of a single file."""
152
# First, check whether this custom merge logic should be used. We
153
# expect most files should not be merged by this handler.
155
# OTHER is a straight winner, rely on default merge.
156
params.winner == 'other' or
157
# THIS and OTHER aren't both files.
158
not params.is_file_merge() or
159
# The filename isn't listed in the 'NAME_merge_files' config
161
not self.filename_matches_config(params)):
162
return 'not_applicable', None
163
return self.merge_text(params)
165
def merge_text(self, params):
166
"""Merge the byte contents of a single file.
168
This is called after checking that the merge should be performed in
169
merge_contents, and it should behave as per
170
``bzrlib.merge.AbstractPerFileMerger.merge_contents``.
172
raise NotImplementedError(self.merge_text)
175
class MergeHookParams(object):
176
"""Object holding parameters passed to merge_file_content hooks.
178
There are some fields hooks can access:
180
:ivar file_id: the file ID of the file being merged
181
:ivar trans_id: the transform ID for the merge of this file
182
:ivar this_kind: kind of file_id in 'this' tree
183
:ivar other_kind: kind of file_id in 'other' tree
184
:ivar winner: one of 'this', 'other', 'conflict'
187
def __init__(self, merger, file_id, trans_id, this_kind, other_kind,
189
self._merger = merger
190
self.file_id = file_id
191
self.trans_id = trans_id
192
self.this_kind = this_kind
193
self.other_kind = other_kind
196
def is_file_merge(self):
197
"""True if this_kind and other_kind are both 'file'."""
198
return self.this_kind == 'file' and self.other_kind == 'file'
200
@decorators.cachedproperty
201
def base_lines(self):
202
"""The lines of the 'base' version of the file."""
203
return self._merger.get_lines(self._merger.base_tree, self.file_id)
205
@decorators.cachedproperty
206
def this_lines(self):
207
"""The lines of the 'this' version of the file."""
208
return self._merger.get_lines(self._merger.this_tree, self.file_id)
210
@decorators.cachedproperty
211
def other_lines(self):
212
"""The lines of the 'other' version of the file."""
213
return self._merger.get_lines(self._merger.other_tree, self.file_id)
216
class Merger(object):
220
def __init__(self, this_branch, other_tree=None, base_tree=None,
221
this_tree=None, pb=None, change_reporter=None,
222
recurse='down', revision_graph=None):
223
object.__init__(self)
224
self.this_branch = this_branch
225
self.this_basis = _mod_revision.ensure_null(
226
this_branch.last_revision())
227
self.this_rev_id = None
228
self.this_tree = this_tree
229
self.this_revision_tree = None
230
self.this_basis_tree = None
231
self.other_tree = other_tree
232
self.other_branch = None
233
self.base_tree = base_tree
234
self.ignore_zero = False
235
self.backup_files = False
236
self.interesting_ids = None
237
self.interesting_files = None
238
self.show_base = False
239
self.reprocess = False
241
warnings.warn("pb parameter to Merger() is deprecated and ignored")
243
self.recurse = recurse
244
self.change_reporter = change_reporter
245
self._cached_trees = {}
246
self._revision_graph = revision_graph
247
self._base_is_ancestor = None
248
self._base_is_other_ancestor = None
249
self._is_criss_cross = None
250
self._lca_trees = None
252
def cache_trees_with_revision_ids(self, trees):
253
"""Cache any tree in trees if it has a revision_id."""
254
for maybe_tree in trees:
255
if maybe_tree is None:
258
rev_id = maybe_tree.get_revision_id()
259
except AttributeError:
261
self._cached_trees[rev_id] = maybe_tree
264
def revision_graph(self):
265
if self._revision_graph is None:
266
self._revision_graph = self.this_branch.repository.get_graph()
267
return self._revision_graph
269
def _set_base_is_ancestor(self, value):
270
self._base_is_ancestor = value
272
def _get_base_is_ancestor(self):
273
if self._base_is_ancestor is None:
274
self._base_is_ancestor = self.revision_graph.is_ancestor(
275
self.base_rev_id, self.this_basis)
276
return self._base_is_ancestor
278
base_is_ancestor = property(_get_base_is_ancestor, _set_base_is_ancestor)
280
def _set_base_is_other_ancestor(self, value):
281
self._base_is_other_ancestor = value
283
def _get_base_is_other_ancestor(self):
284
if self._base_is_other_ancestor is None:
285
if self.other_basis is None:
287
self._base_is_other_ancestor = self.revision_graph.is_ancestor(
288
self.base_rev_id, self.other_basis)
289
return self._base_is_other_ancestor
291
base_is_other_ancestor = property(_get_base_is_other_ancestor,
292
_set_base_is_other_ancestor)
295
def from_uncommitted(tree, other_tree, pb=None, base_tree=None):
296
"""Return a Merger for uncommitted changes in other_tree.
298
:param tree: The tree to merge into
299
:param other_tree: The tree to get uncommitted changes from
300
:param pb: A progress indicator
301
:param base_tree: The basis to use for the merge. If unspecified,
302
other_tree.basis_tree() will be used.
304
if base_tree is None:
305
base_tree = other_tree.basis_tree()
306
merger = Merger(tree.branch, other_tree, base_tree, tree, pb)
307
merger.base_rev_id = merger.base_tree.get_revision_id()
308
merger.other_rev_id = None
309
merger.other_basis = merger.base_rev_id
313
def from_mergeable(klass, tree, mergeable, pb):
314
"""Return a Merger for a bundle or merge directive.
316
:param tree: The tree to merge changes into
317
:param mergeable: A merge directive or bundle
318
:param pb: A progress indicator
320
mergeable.install_revisions(tree.branch.repository)
321
base_revision_id, other_revision_id, verified =\
322
mergeable.get_merge_request(tree.branch.repository)
323
revision_graph = tree.branch.repository.get_graph()
324
if base_revision_id is not None:
325
if (base_revision_id != _mod_revision.NULL_REVISION and
326
revision_graph.is_ancestor(
327
base_revision_id, tree.branch.last_revision())):
328
base_revision_id = None
330
trace.warning('Performing cherrypick')
331
merger = klass.from_revision_ids(pb, tree, other_revision_id,
332
base_revision_id, revision_graph=
334
return merger, verified
337
def from_revision_ids(pb, tree, other, base=None, other_branch=None,
338
base_branch=None, revision_graph=None,
340
"""Return a Merger for revision-ids.
342
:param pb: A progress indicator
343
:param tree: The tree to merge changes into
344
:param other: The revision-id to use as OTHER
345
:param base: The revision-id to use as BASE. If not specified, will
347
:param other_branch: A branch containing the other revision-id. If
348
not supplied, tree.branch is used.
349
:param base_branch: A branch containing the base revision-id. If
350
not supplied, other_branch or tree.branch will be used.
351
:param revision_graph: If you have a revision_graph precomputed, pass
352
it in, otherwise it will be created for you.
353
:param tree_branch: The branch associated with tree. If not supplied,
354
tree.branch will be used.
356
if tree_branch is None:
357
tree_branch = tree.branch
358
merger = Merger(tree_branch, this_tree=tree, pb=pb,
359
revision_graph=revision_graph)
360
if other_branch is None:
361
other_branch = tree.branch
362
merger.set_other_revision(other, other_branch)
366
if base_branch is None:
367
base_branch = other_branch
368
merger.set_base_revision(base, base_branch)
371
def revision_tree(self, revision_id, branch=None):
372
if revision_id not in self._cached_trees:
374
branch = self.this_branch
376
tree = self.this_tree.revision_tree(revision_id)
377
except errors.NoSuchRevisionInTree:
378
tree = branch.repository.revision_tree(revision_id)
379
self._cached_trees[revision_id] = tree
380
return self._cached_trees[revision_id]
382
def _get_tree(self, treespec, possible_transports=None):
383
from bzrlib import workingtree
384
location, revno = treespec
386
tree = workingtree.WorkingTree.open_containing(location)[0]
387
return tree.branch, tree
388
branch = _mod_branch.Branch.open_containing(
389
location, possible_transports)[0]
391
revision_id = branch.last_revision()
393
revision_id = branch.get_rev_id(revno)
394
revision_id = _mod_revision.ensure_null(revision_id)
395
return branch, self.revision_tree(revision_id, branch)
397
@deprecated_method(deprecated_in((2, 1, 0)))
398
def ensure_revision_trees(self):
399
if self.this_revision_tree is None:
400
self.this_basis_tree = self.revision_tree(self.this_basis)
401
if self.this_basis == self.this_rev_id:
402
self.this_revision_tree = self.this_basis_tree
404
if self.other_rev_id is None:
405
other_basis_tree = self.revision_tree(self.other_basis)
406
if other_basis_tree.has_changes(self.other_tree):
407
raise errors.WorkingTreeNotRevision(self.this_tree)
408
other_rev_id = self.other_basis
409
self.other_tree = other_basis_tree
411
@deprecated_method(deprecated_in((2, 1, 0)))
412
def file_revisions(self, file_id):
413
self.ensure_revision_trees()
414
def get_id(tree, file_id):
415
revision_id = tree.inventory[file_id].revision
417
if self.this_rev_id is None:
418
if self.this_basis_tree.get_file_sha1(file_id) != \
419
self.this_tree.get_file_sha1(file_id):
420
raise errors.WorkingTreeNotRevision(self.this_tree)
422
trees = (self.this_basis_tree, self.other_tree)
423
return [get_id(tree, file_id) for tree in trees]
425
@deprecated_method(deprecated_in((2, 1, 0)))
426
def check_basis(self, check_clean, require_commits=True):
427
if self.this_basis is None and require_commits is True:
428
raise errors.BzrCommandError(
429
"This branch has no commits."
430
" (perhaps you would prefer 'bzr pull')")
433
if self.this_basis != self.this_rev_id:
434
raise errors.UncommittedChanges(self.this_tree)
436
@deprecated_method(deprecated_in((2, 1, 0)))
437
def compare_basis(self):
439
basis_tree = self.revision_tree(self.this_tree.last_revision())
440
except errors.NoSuchRevision:
441
basis_tree = self.this_tree.basis_tree()
442
if not self.this_tree.has_changes(basis_tree):
443
self.this_rev_id = self.this_basis
445
def set_interesting_files(self, file_list):
446
self.interesting_files = file_list
448
def set_pending(self):
449
if (not self.base_is_ancestor or not self.base_is_other_ancestor
450
or self.other_rev_id is None):
454
def _add_parent(self):
455
new_parents = self.this_tree.get_parent_ids() + [self.other_rev_id]
456
new_parent_trees = []
457
operation = OperationWithCleanups(self.this_tree.set_parent_trees)
458
for revision_id in new_parents:
460
tree = self.revision_tree(revision_id)
461
except errors.NoSuchRevision:
465
operation.add_cleanup(tree.unlock)
466
new_parent_trees.append((revision_id, tree))
467
operation.run_simple(new_parent_trees, allow_leftmost_as_ghost=True)
469
def set_other(self, other_revision, possible_transports=None):
470
"""Set the revision and tree to merge from.
472
This sets the other_tree, other_rev_id, other_basis attributes.
474
:param other_revision: The [path, revision] list to merge from.
476
self.other_branch, self.other_tree = self._get_tree(other_revision,
478
if other_revision[1] == -1:
479
self.other_rev_id = _mod_revision.ensure_null(
480
self.other_branch.last_revision())
481
if _mod_revision.is_null(self.other_rev_id):
482
raise errors.NoCommits(self.other_branch)
483
self.other_basis = self.other_rev_id
484
elif other_revision[1] is not None:
485
self.other_rev_id = self.other_branch.get_rev_id(other_revision[1])
486
self.other_basis = self.other_rev_id
488
self.other_rev_id = None
489
self.other_basis = self.other_branch.last_revision()
490
if self.other_basis is None:
491
raise errors.NoCommits(self.other_branch)
492
if self.other_rev_id is not None:
493
self._cached_trees[self.other_rev_id] = self.other_tree
494
self._maybe_fetch(self.other_branch,self.this_branch, self.other_basis)
496
def set_other_revision(self, revision_id, other_branch):
497
"""Set 'other' based on a branch and revision id
499
:param revision_id: The revision to use for a tree
500
:param other_branch: The branch containing this tree
502
self.other_rev_id = revision_id
503
self.other_branch = other_branch
504
self._maybe_fetch(other_branch, self.this_branch, self.other_rev_id)
505
self.other_tree = self.revision_tree(revision_id)
506
self.other_basis = revision_id
508
def set_base_revision(self, revision_id, branch):
509
"""Set 'base' based on a branch and revision id
511
:param revision_id: The revision to use for a tree
512
:param branch: The branch containing this tree
514
self.base_rev_id = revision_id
515
self.base_branch = branch
516
self._maybe_fetch(branch, self.this_branch, revision_id)
517
self.base_tree = self.revision_tree(revision_id)
519
def _maybe_fetch(self, source, target, revision_id):
520
if not source.repository.has_same_location(target.repository):
521
target.fetch(source, revision_id)
524
revisions = [_mod_revision.ensure_null(self.this_basis),
525
_mod_revision.ensure_null(self.other_basis)]
526
if _mod_revision.NULL_REVISION in revisions:
527
self.base_rev_id = _mod_revision.NULL_REVISION
528
self.base_tree = self.revision_tree(self.base_rev_id)
529
self._is_criss_cross = False
531
lcas = self.revision_graph.find_lca(revisions[0], revisions[1])
532
self._is_criss_cross = False
534
self.base_rev_id = _mod_revision.NULL_REVISION
536
self.base_rev_id = list(lcas)[0]
537
else: # len(lcas) > 1
539
# find_unique_lca can only handle 2 nodes, so we have to
540
# start back at the beginning. It is a shame to traverse
541
# the graph again, but better than re-implementing
543
self.base_rev_id = self.revision_graph.find_unique_lca(
544
revisions[0], revisions[1])
546
self.base_rev_id = self.revision_graph.find_unique_lca(
548
self._is_criss_cross = True
549
if self.base_rev_id == _mod_revision.NULL_REVISION:
550
raise errors.UnrelatedBranches()
551
if self._is_criss_cross:
552
trace.warning('Warning: criss-cross merge encountered. See bzr'
553
' help criss-cross.')
554
trace.mutter('Criss-cross lcas: %r' % lcas)
555
interesting_revision_ids = [self.base_rev_id]
556
interesting_revision_ids.extend(lcas)
557
interesting_trees = dict((t.get_revision_id(), t)
558
for t in self.this_branch.repository.revision_trees(
559
interesting_revision_ids))
560
self._cached_trees.update(interesting_trees)
561
self.base_tree = interesting_trees.pop(self.base_rev_id)
562
sorted_lca_keys = self.revision_graph.find_merge_order(
564
self._lca_trees = [interesting_trees[key]
565
for key in sorted_lca_keys]
567
self.base_tree = self.revision_tree(self.base_rev_id)
568
self.base_is_ancestor = True
569
self.base_is_other_ancestor = True
570
trace.mutter('Base revid: %r' % self.base_rev_id)
572
def set_base(self, base_revision):
573
"""Set the base revision to use for the merge.
575
:param base_revision: A 2-list containing a path and revision number.
577
trace.mutter("doing merge() with no base_revision specified")
578
if base_revision == [None, None]:
581
base_branch, self.base_tree = self._get_tree(base_revision)
582
if base_revision[1] == -1:
583
self.base_rev_id = base_branch.last_revision()
584
elif base_revision[1] is None:
585
self.base_rev_id = _mod_revision.NULL_REVISION
587
self.base_rev_id = _mod_revision.ensure_null(
588
base_branch.get_rev_id(base_revision[1]))
589
self._maybe_fetch(base_branch, self.this_branch, self.base_rev_id)
591
def make_merger(self):
592
kwargs = {'working_tree':self.this_tree, 'this_tree': self.this_tree,
593
'other_tree': self.other_tree,
594
'interesting_ids': self.interesting_ids,
595
'interesting_files': self.interesting_files,
596
'this_branch': self.this_branch,
598
if self.merge_type.requires_base:
599
kwargs['base_tree'] = self.base_tree
600
if self.merge_type.supports_reprocess:
601
kwargs['reprocess'] = self.reprocess
603
raise errors.BzrError(
604
"Conflict reduction is not supported for merge"
605
" type %s." % self.merge_type)
606
if self.merge_type.supports_show_base:
607
kwargs['show_base'] = self.show_base
609
raise errors.BzrError("Showing base is not supported for this"
610
" merge type. %s" % self.merge_type)
611
if (not getattr(self.merge_type, 'supports_reverse_cherrypick', True)
612
and not self.base_is_other_ancestor):
613
raise errors.CannotReverseCherrypick()
614
if self.merge_type.supports_cherrypick:
615
kwargs['cherrypick'] = (not self.base_is_ancestor or
616
not self.base_is_other_ancestor)
617
if self._is_criss_cross and getattr(self.merge_type,
618
'supports_lca_trees', False):
619
kwargs['lca_trees'] = self._lca_trees
620
return self.merge_type(pb=None,
621
change_reporter=self.change_reporter,
624
def _do_merge_to(self):
625
merge = self.make_merger()
626
if self.other_branch is not None:
627
self.other_branch.update_references(self.this_branch)
629
if self.recurse == 'down':
630
for relpath, file_id in self.this_tree.iter_references():
631
sub_tree = self.this_tree.get_nested_tree(file_id, relpath)
632
other_revision = self.other_tree.get_reference_revision(
634
if other_revision == sub_tree.last_revision():
636
sub_merge = Merger(sub_tree.branch, this_tree=sub_tree)
637
sub_merge.merge_type = self.merge_type
638
other_branch = self.other_branch.reference_parent(file_id, relpath)
639
sub_merge.set_other_revision(other_revision, other_branch)
640
base_revision = self.base_tree.get_reference_revision(file_id)
641
sub_merge.base_tree = \
642
sub_tree.branch.repository.revision_tree(base_revision)
643
sub_merge.base_rev_id = base_revision
648
operation = OperationWithCleanups(self._do_merge_to)
649
self.this_tree.lock_tree_write()
650
operation.add_cleanup(self.this_tree.unlock)
651
if self.base_tree is not None:
652
self.base_tree.lock_read()
653
operation.add_cleanup(self.base_tree.unlock)
654
if self.other_tree is not None:
655
self.other_tree.lock_read()
656
operation.add_cleanup(self.other_tree.unlock)
657
merge = operation.run_simple()
658
if len(merge.cooked_conflicts) == 0:
659
if not self.ignore_zero and not trace.is_quiet():
660
trace.note("All changes applied successfully.")
662
trace.note("%d conflicts encountered."
663
% len(merge.cooked_conflicts))
665
return len(merge.cooked_conflicts)
668
class _InventoryNoneEntry(object):
669
"""This represents an inventory entry which *isn't there*.
671
It simplifies the merging logic if we always have an InventoryEntry, even
672
if it isn't actually present
679
symlink_target = None
682
_none_entry = _InventoryNoneEntry()
685
class Merge3Merger(object):
686
"""Three-way merger that uses the merge3 text merger"""
688
supports_reprocess = True
689
supports_show_base = True
690
history_based = False
691
supports_cherrypick = True
692
supports_reverse_cherrypick = True
693
winner_idx = {"this": 2, "other": 1, "conflict": 1}
694
supports_lca_trees = True
696
def __init__(self, working_tree, this_tree, base_tree, other_tree,
697
interesting_ids=None, reprocess=False, show_base=False,
698
pb=None, pp=None, change_reporter=None,
699
interesting_files=None, do_merge=True,
700
cherrypick=False, lca_trees=None, this_branch=None):
701
"""Initialize the merger object and perform the merge.
703
:param working_tree: The working tree to apply the merge to
704
:param this_tree: The local tree in the merge operation
705
:param base_tree: The common tree in the merge operation
706
:param other_tree: The other tree to merge changes from
707
:param this_branch: The branch associated with this_tree
708
:param interesting_ids: The file_ids of files that should be
709
participate in the merge. May not be combined with
711
:param: reprocess If True, perform conflict-reduction processing.
712
:param show_base: If True, show the base revision in text conflicts.
713
(incompatible with reprocess)
715
:param pp: A ProgressPhase object
716
:param change_reporter: An object that should report changes made
717
:param interesting_files: The tree-relative paths of files that should
718
participate in the merge. If these paths refer to directories,
719
the contents of those directories will also be included. May not
720
be combined with interesting_ids. If neither interesting_files nor
721
interesting_ids is specified, all files may participate in the
723
:param lca_trees: Can be set to a dictionary of {revision_id:rev_tree}
724
if the ancestry was found to include a criss-cross merge.
725
Otherwise should be None.
727
object.__init__(self)
728
if interesting_files is not None and interesting_ids is not None:
730
'specify either interesting_ids or interesting_files')
731
self.interesting_ids = interesting_ids
732
self.interesting_files = interesting_files
733
self.this_tree = working_tree
734
self.base_tree = base_tree
735
self.other_tree = other_tree
736
self.this_branch = this_branch
737
self._raw_conflicts = []
738
self.cooked_conflicts = []
739
self.reprocess = reprocess
740
self.show_base = show_base
741
self._lca_trees = lca_trees
742
# Uncommenting this will change the default algorithm to always use
743
# _entries_lca. This can be useful for running the test suite and
744
# making sure we haven't missed any corner cases.
745
# if lca_trees is None:
746
# self._lca_trees = [self.base_tree]
747
self.change_reporter = change_reporter
748
self.cherrypick = cherrypick
752
warnings.warn("pp argument to Merge3Merger is deprecated")
754
warnings.warn("pb argument to Merge3Merger is deprecated")
757
operation = OperationWithCleanups(self._do_merge)
758
self.this_tree.lock_tree_write()
759
operation.add_cleanup(self.this_tree.unlock)
760
self.base_tree.lock_read()
761
operation.add_cleanup(self.base_tree.unlock)
762
self.other_tree.lock_read()
763
operation.add_cleanup(self.other_tree.unlock)
766
def _do_merge(self, operation):
767
self.tt = transform.TreeTransform(self.this_tree, None)
768
operation.add_cleanup(self.tt.finalize)
769
self._compute_transform()
770
results = self.tt.apply(no_conflicts=True)
771
self.write_modified(results)
773
self.this_tree.add_conflicts(self.cooked_conflicts)
774
except errors.UnsupportedOperation:
777
def make_preview_transform(self):
778
operation = OperationWithCleanups(self._make_preview_transform)
779
self.base_tree.lock_read()
780
operation.add_cleanup(self.base_tree.unlock)
781
self.other_tree.lock_read()
782
operation.add_cleanup(self.other_tree.unlock)
783
return operation.run_simple()
785
def _make_preview_transform(self):
786
self.tt = transform.TransformPreview(self.this_tree)
787
self._compute_transform()
790
def _compute_transform(self):
791
if self._lca_trees is None:
792
entries = self._entries3()
793
resolver = self._three_way
795
entries = self._entries_lca()
796
resolver = self._lca_multi_way
797
child_pb = ui.ui_factory.nested_progress_bar()
799
factories = Merger.hooks['merge_file_content']
800
hooks = [factory(self) for factory in factories] + [self]
801
self.active_hooks = [hook for hook in hooks if hook is not None]
802
for num, (file_id, changed, parents3, names3,
803
executable3) in enumerate(entries):
804
child_pb.update('Preparing file merge', num, len(entries))
805
self._merge_names(file_id, parents3, names3, resolver=resolver)
807
file_status = self._do_merge_contents(file_id)
809
file_status = 'unmodified'
810
self._merge_executable(file_id,
811
executable3, file_status, resolver=resolver)
815
child_pb = ui.ui_factory.nested_progress_bar()
817
fs_conflicts = transform.resolve_conflicts(self.tt, child_pb,
818
lambda t, c: transform.conflict_pass(t, c, self.other_tree))
821
if self.change_reporter is not None:
822
from bzrlib import delta
823
delta.report_changes(
824
self.tt.iter_changes(), self.change_reporter)
825
self.cook_conflicts(fs_conflicts)
826
for conflict in self.cooked_conflicts:
827
trace.warning(conflict)
830
"""Gather data about files modified between three trees.
832
Return a list of tuples of file_id, changed, parents3, names3,
833
executable3. changed is a boolean indicating whether the file contents
834
or kind were changed. parents3 is a tuple of parent ids for base,
835
other and this. names3 is a tuple of names for base, other and this.
836
executable3 is a tuple of execute-bit values for base, other and this.
839
iterator = self.other_tree.iter_changes(self.base_tree,
840
include_unchanged=True, specific_files=self.interesting_files,
841
extra_trees=[self.this_tree])
842
this_entries = dict((e.file_id, e) for p, e in
843
self.this_tree.iter_entries_by_dir(
844
self.interesting_ids))
845
for (file_id, paths, changed, versioned, parents, names, kind,
846
executable) in iterator:
847
if (self.interesting_ids is not None and
848
file_id not in self.interesting_ids):
850
entry = this_entries.get(file_id)
851
if entry is not None:
852
this_name = entry.name
853
this_parent = entry.parent_id
854
this_executable = entry.executable
858
this_executable = None
859
parents3 = parents + (this_parent,)
860
names3 = names + (this_name,)
861
executable3 = executable + (this_executable,)
862
result.append((file_id, changed, parents3, names3, executable3))
865
def _entries_lca(self):
866
"""Gather data about files modified between multiple trees.
868
This compares OTHER versus all LCA trees, and for interesting entries,
869
it then compares with THIS and BASE.
871
For the multi-valued entries, the format will be (BASE, [lca1, lca2])
872
:return: [(file_id, changed, parents, names, executable)]
873
file_id Simple file_id of the entry
874
changed Boolean, True if the kind or contents changed
876
parents ((base, [parent_id, in, lcas]), parent_id_other,
878
names ((base, [name, in, lcas]), name_in_other, name_in_this)
879
executable ((base, [exec, in, lcas]), exec_in_other, exec_in_this)
881
if self.interesting_files is not None:
882
lookup_trees = [self.this_tree, self.base_tree]
883
lookup_trees.extend(self._lca_trees)
884
# I think we should include the lca trees as well
885
interesting_ids = self.other_tree.paths2ids(self.interesting_files,
888
interesting_ids = self.interesting_ids
890
walker = _mod_tree.MultiWalker(self.other_tree, self._lca_trees)
892
base_inventory = self.base_tree.inventory
893
this_inventory = self.this_tree.inventory
894
for path, file_id, other_ie, lca_values in walker.iter_all():
895
# Is this modified at all from any of the other trees?
897
other_ie = _none_entry
898
if interesting_ids is not None and file_id not in interesting_ids:
901
# If other_revision is found in any of the lcas, that means this
902
# node is uninteresting. This is because when merging, if there are
903
# multiple heads(), we have to create a new node. So if we didn't,
904
# we know that the ancestry is linear, and that OTHER did not
906
# See doc/developers/lca_merge_resolution.txt for details
907
other_revision = other_ie.revision
908
if other_revision is not None:
909
# We can't use this shortcut when other_revision is None,
910
# because it may be None because things are WorkingTrees, and
911
# not because it is *actually* None.
912
is_unmodified = False
913
for lca_path, ie in lca_values:
914
if ie is not None and ie.revision == other_revision:
921
for lca_path, lca_ie in lca_values:
923
lca_entries.append(_none_entry)
925
lca_entries.append(lca_ie)
927
if file_id in base_inventory:
928
base_ie = base_inventory[file_id]
930
base_ie = _none_entry
932
if file_id in this_inventory:
933
this_ie = this_inventory[file_id]
935
this_ie = _none_entry
941
for lca_ie in lca_entries:
942
lca_kinds.append(lca_ie.kind)
943
lca_parent_ids.append(lca_ie.parent_id)
944
lca_names.append(lca_ie.name)
945
lca_executable.append(lca_ie.executable)
947
kind_winner = self._lca_multi_way(
948
(base_ie.kind, lca_kinds),
949
other_ie.kind, this_ie.kind)
950
parent_id_winner = self._lca_multi_way(
951
(base_ie.parent_id, lca_parent_ids),
952
other_ie.parent_id, this_ie.parent_id)
953
name_winner = self._lca_multi_way(
954
(base_ie.name, lca_names),
955
other_ie.name, this_ie.name)
957
content_changed = True
958
if kind_winner == 'this':
959
# No kind change in OTHER, see if there are *any* changes
960
if other_ie.kind == 'directory':
961
if parent_id_winner == 'this' and name_winner == 'this':
962
# No change for this directory in OTHER, skip
964
content_changed = False
965
elif other_ie.kind is None or other_ie.kind == 'file':
966
def get_sha1(ie, tree):
967
if ie.kind != 'file':
969
return tree.get_file_sha1(file_id)
970
base_sha1 = get_sha1(base_ie, self.base_tree)
971
lca_sha1s = [get_sha1(ie, tree) for ie, tree
972
in zip(lca_entries, self._lca_trees)]
973
this_sha1 = get_sha1(this_ie, self.this_tree)
974
other_sha1 = get_sha1(other_ie, self.other_tree)
975
sha1_winner = self._lca_multi_way(
976
(base_sha1, lca_sha1s), other_sha1, this_sha1,
977
allow_overriding_lca=False)
978
exec_winner = self._lca_multi_way(
979
(base_ie.executable, lca_executable),
980
other_ie.executable, this_ie.executable)
981
if (parent_id_winner == 'this' and name_winner == 'this'
982
and sha1_winner == 'this' and exec_winner == 'this'):
983
# No kind, parent, name, exec, or content change for
984
# OTHER, so this node is not considered interesting
986
if sha1_winner == 'this':
987
content_changed = False
988
elif other_ie.kind == 'symlink':
989
def get_target(ie, tree):
990
if ie.kind != 'symlink':
992
return tree.get_symlink_target(file_id)
993
base_target = get_target(base_ie, self.base_tree)
994
lca_targets = [get_target(ie, tree) for ie, tree
995
in zip(lca_entries, self._lca_trees)]
996
this_target = get_target(this_ie, self.this_tree)
997
other_target = get_target(other_ie, self.other_tree)
998
target_winner = self._lca_multi_way(
999
(base_target, lca_targets),
1000
other_target, this_target)
1001
if (parent_id_winner == 'this' and name_winner == 'this'
1002
and target_winner == 'this'):
1003
# No kind, parent, name, or symlink target change
1006
if target_winner == 'this':
1007
content_changed = False
1008
elif other_ie.kind == 'tree-reference':
1009
# The 'changed' information seems to be handled at a higher
1010
# level. At least, _entries3 returns False for content
1011
# changed, even when at a new revision_id.
1012
content_changed = False
1013
if (parent_id_winner == 'this' and name_winner == 'this'):
1014
# Nothing interesting
1017
raise AssertionError('unhandled kind: %s' % other_ie.kind)
1018
# XXX: We need to handle kind == 'symlink'
1020
# If we have gotten this far, that means something has changed
1021
result.append((file_id, content_changed,
1022
((base_ie.parent_id, lca_parent_ids),
1023
other_ie.parent_id, this_ie.parent_id),
1024
((base_ie.name, lca_names),
1025
other_ie.name, this_ie.name),
1026
((base_ie.executable, lca_executable),
1027
other_ie.executable, this_ie.executable)
1034
self.tt.final_kind(self.tt.root)
1035
except errors.NoSuchFile:
1036
self.tt.cancel_deletion(self.tt.root)
1037
if self.tt.final_file_id(self.tt.root) is None:
1038
self.tt.version_file(self.tt.tree_file_id(self.tt.root),
1040
other_root_file_id = self.other_tree.get_root_id()
1041
if other_root_file_id is None:
1043
other_root = self.tt.trans_id_file_id(other_root_file_id)
1044
if other_root == self.tt.root:
1047
self.tt.final_kind(other_root)
1048
except errors.NoSuchFile:
1050
if self.this_tree.has_id(self.other_tree.inventory.root.file_id):
1051
# the other tree's root is a non-root in the current tree
1053
self.reparent_children(self.other_tree.inventory.root, self.tt.root)
1054
self.tt.cancel_creation(other_root)
1055
self.tt.cancel_versioning(other_root)
1057
def reparent_children(self, ie, target):
1058
for thing, child in ie.children.iteritems():
1059
trans_id = self.tt.trans_id_file_id(child.file_id)
1060
self.tt.adjust_path(self.tt.final_name(trans_id), target, trans_id)
1062
def write_modified(self, results):
1063
modified_hashes = {}
1064
for path in results.modified_paths:
1065
file_id = self.this_tree.path2id(self.this_tree.relpath(path))
1068
hash = self.this_tree.get_file_sha1(file_id)
1071
modified_hashes[file_id] = hash
1072
self.this_tree.set_merge_modified(modified_hashes)
1075
def parent(entry, file_id):
1076
"""Determine the parent for a file_id (used as a key method)"""
1079
return entry.parent_id
1082
def name(entry, file_id):
1083
"""Determine the name for a file_id (used as a key method)"""
1089
def contents_sha1(tree, file_id):
1090
"""Determine the sha1 of the file contents (used as a key method)."""
1091
if file_id not in tree:
1093
return tree.get_file_sha1(file_id)
1096
def executable(tree, file_id):
1097
"""Determine the executability of a file-id (used as a key method)."""
1098
if not tree.has_id(file_id):
1100
if tree.kind(file_id) != "file":
1102
return tree.is_executable(file_id)
1105
def kind(tree, file_id):
1106
"""Determine the kind of a file-id (used as a key method)."""
1107
if not tree.has_id(file_id):
1109
return tree.kind(file_id)
1112
def _three_way(base, other, this):
1113
#if base == other, either they all agree, or only THIS has changed.
1116
elif this not in (base, other):
1118
# "Ambiguous clean merge" -- both sides have made the same change.
1121
# this == base: only other has changed.
1126
def _lca_multi_way(bases, other, this, allow_overriding_lca=True):
1127
"""Consider LCAs when determining whether a change has occurred.
1129
If LCAS are all identical, this is the same as a _three_way comparison.
1131
:param bases: value in (BASE, [LCAS])
1132
:param other: value in OTHER
1133
:param this: value in THIS
1134
:param allow_overriding_lca: If there is more than one unique lca
1135
value, allow OTHER to override THIS if it has a new value, and
1136
THIS only has an lca value, or vice versa. This is appropriate for
1137
truly scalar values, not as much for non-scalars.
1138
:return: 'this', 'other', or 'conflict' depending on whether an entry
1141
# See doc/developers/lca_tree_merging.txt for details about this
1144
# Either Ambiguously clean, or nothing was actually changed. We
1147
base_val, lca_vals = bases
1148
# Remove 'base_val' from the lca_vals, because it is not interesting
1149
filtered_lca_vals = [lca_val for lca_val in lca_vals
1150
if lca_val != base_val]
1151
if len(filtered_lca_vals) == 0:
1152
return Merge3Merger._three_way(base_val, other, this)
1154
unique_lca_vals = set(filtered_lca_vals)
1155
if len(unique_lca_vals) == 1:
1156
return Merge3Merger._three_way(unique_lca_vals.pop(), other, this)
1158
if allow_overriding_lca:
1159
if other in unique_lca_vals:
1160
if this in unique_lca_vals:
1161
# Each side picked a different lca, conflict
1164
# This has a value which supersedes both lca values, and
1165
# other only has an lca value
1167
elif this in unique_lca_vals:
1168
# OTHER has a value which supersedes both lca values, and this
1169
# only has an lca value
1172
# At this point, the lcas disagree, and the tips disagree
1176
def scalar_three_way(this_tree, base_tree, other_tree, file_id, key):
1177
"""Do a three-way test on a scalar.
1178
Return "this", "other" or "conflict", depending whether a value wins.
1180
key_base = key(base_tree, file_id)
1181
key_other = key(other_tree, file_id)
1182
#if base == other, either they all agree, or only THIS has changed.
1183
if key_base == key_other:
1185
key_this = key(this_tree, file_id)
1186
# "Ambiguous clean merge"
1187
if key_this == key_other:
1189
elif key_this == key_base:
1194
def merge_names(self, file_id):
1195
def get_entry(tree):
1196
if tree.has_id(file_id):
1197
return tree.inventory[file_id]
1200
this_entry = get_entry(self.this_tree)
1201
other_entry = get_entry(self.other_tree)
1202
base_entry = get_entry(self.base_tree)
1203
entries = (base_entry, other_entry, this_entry)
1206
for entry in entries:
1209
parents.append(None)
1211
names.append(entry.name)
1212
parents.append(entry.parent_id)
1213
return self._merge_names(file_id, parents, names,
1214
resolver=self._three_way)
1216
def _merge_names(self, file_id, parents, names, resolver):
1217
"""Perform a merge on file_id names and parents"""
1218
base_name, other_name, this_name = names
1219
base_parent, other_parent, this_parent = parents
1221
name_winner = resolver(*names)
1223
parent_id_winner = resolver(*parents)
1224
if this_name is None:
1225
if name_winner == "this":
1226
name_winner = "other"
1227
if parent_id_winner == "this":
1228
parent_id_winner = "other"
1229
if name_winner == "this" and parent_id_winner == "this":
1231
if name_winner == 'conflict' or parent_id_winner == 'conflict':
1232
# Creating helpers here cause problems down the road if a
1233
# ContentConflict needs to be created so we should not do that
1234
trans_id = self.tt.trans_id_file_id(file_id)
1235
self._raw_conflicts.append(('path conflict', trans_id, file_id,
1236
this_parent, this_name,
1237
other_parent, other_name))
1238
if other_name is None:
1239
# it doesn't matter whether the result was 'other' or
1240
# 'conflict'-- if there's no 'other', we leave it alone.
1242
parent_id = parents[self.winner_idx[parent_id_winner]]
1243
if parent_id is not None:
1244
# if we get here, name_winner and parent_winner are set to safe
1246
self.tt.adjust_path(names[self.winner_idx[name_winner]],
1247
self.tt.trans_id_file_id(parent_id),
1248
self.tt.trans_id_file_id(file_id))
1250
def _do_merge_contents(self, file_id):
1251
"""Performs a merge on file_id contents."""
1252
def contents_pair(tree):
1253
if file_id not in tree:
1255
kind = tree.kind(file_id)
1257
contents = tree.get_file_sha1(file_id)
1258
elif kind == "symlink":
1259
contents = tree.get_symlink_target(file_id)
1262
return kind, contents
1264
# See SPOT run. run, SPOT, run.
1265
# So we're not QUITE repeating ourselves; we do tricky things with
1267
base_pair = contents_pair(self.base_tree)
1268
other_pair = contents_pair(self.other_tree)
1270
this_pair = contents_pair(self.this_tree)
1271
lca_pairs = [contents_pair(tree) for tree in self._lca_trees]
1272
winner = self._lca_multi_way((base_pair, lca_pairs), other_pair,
1273
this_pair, allow_overriding_lca=False)
1275
if base_pair == other_pair:
1278
# We delayed evaluating this_pair as long as we can to avoid
1279
# unnecessary sha1 calculation
1280
this_pair = contents_pair(self.this_tree)
1281
winner = self._three_way(base_pair, other_pair, this_pair)
1282
if winner == 'this':
1283
# No interesting changes introduced by OTHER
1285
# We have a hypothetical conflict, but if we have files, then we
1286
# can try to merge the content
1287
trans_id = self.tt.trans_id_file_id(file_id)
1288
params = MergeHookParams(self, file_id, trans_id, this_pair[0],
1289
other_pair[0], winner)
1290
hooks = self.active_hooks
1291
hook_status = 'not_applicable'
1293
hook_status, lines = hook.merge_contents(params)
1294
if hook_status != 'not_applicable':
1295
# Don't try any more hooks, this one applies.
1298
if hook_status == 'not_applicable':
1299
# This is a contents conflict, because none of the available
1300
# functions could merge it.
1302
name = self.tt.final_name(trans_id)
1303
parent_id = self.tt.final_parent(trans_id)
1304
if self.this_tree.has_id(file_id):
1305
self.tt.unversion_file(trans_id)
1306
file_group = self._dump_conflicts(name, parent_id, file_id,
1308
self._raw_conflicts.append(('contents conflict', file_group))
1309
elif hook_status == 'success':
1310
self.tt.create_file(lines, trans_id)
1311
elif hook_status == 'conflicted':
1312
# XXX: perhaps the hook should be able to provide
1313
# the BASE/THIS/OTHER files?
1314
self.tt.create_file(lines, trans_id)
1315
self._raw_conflicts.append(('text conflict', trans_id))
1316
name = self.tt.final_name(trans_id)
1317
parent_id = self.tt.final_parent(trans_id)
1318
self._dump_conflicts(name, parent_id, file_id)
1319
elif hook_status == 'delete':
1320
self.tt.unversion_file(trans_id)
1322
elif hook_status == 'done':
1323
# The hook function did whatever it needs to do directly, no
1324
# further action needed here.
1327
raise AssertionError('unknown hook_status: %r' % (hook_status,))
1328
if not self.this_tree.has_id(file_id) and result == "modified":
1329
self.tt.version_file(file_id, trans_id)
1330
# The merge has been performed, so the old contents should not be
1333
self.tt.delete_contents(trans_id)
1334
except errors.NoSuchFile:
1338
def _default_other_winner_merge(self, merge_hook_params):
1339
"""Replace this contents with other."""
1340
file_id = merge_hook_params.file_id
1341
trans_id = merge_hook_params.trans_id
1342
file_in_this = self.this_tree.has_id(file_id)
1343
if self.other_tree.has_id(file_id):
1344
# OTHER changed the file
1346
if wt.supports_content_filtering():
1347
# We get the path from the working tree if it exists.
1348
# That fails though when OTHER is adding a file, so
1349
# we fall back to the other tree to find the path if
1350
# it doesn't exist locally.
1352
filter_tree_path = wt.id2path(file_id)
1353
except errors.NoSuchId:
1354
filter_tree_path = self.other_tree.id2path(file_id)
1356
# Skip the id2path lookup for older formats
1357
filter_tree_path = None
1358
transform.create_from_tree(self.tt, trans_id,
1359
self.other_tree, file_id,
1360
filter_tree_path=filter_tree_path)
1363
# OTHER deleted the file
1364
return 'delete', None
1366
raise AssertionError(
1367
'winner is OTHER, but file_id %r not in THIS or OTHER tree'
1370
def merge_contents(self, merge_hook_params):
1371
"""Fallback merge logic after user installed hooks."""
1372
# This function is used in merge hooks as the fallback instance.
1373
# Perhaps making this function and the functions it calls be a
1374
# a separate class would be better.
1375
if merge_hook_params.winner == 'other':
1376
# OTHER is a straight winner, so replace this contents with other
1377
return self._default_other_winner_merge(merge_hook_params)
1378
elif merge_hook_params.is_file_merge():
1379
# THIS and OTHER are both files, so text merge. Either
1380
# BASE is a file, or both converted to files, so at least we
1381
# have agreement that output should be a file.
1383
self.text_merge(merge_hook_params.file_id,
1384
merge_hook_params.trans_id)
1385
except errors.BinaryFile:
1386
return 'not_applicable', None
1389
return 'not_applicable', None
1391
def get_lines(self, tree, file_id):
1392
"""Return the lines in a file, or an empty list."""
1393
if tree.has_id(file_id):
1394
return tree.get_file(file_id).readlines()
1398
def text_merge(self, file_id, trans_id):
1399
"""Perform a three-way text merge on a file_id"""
1400
# it's possible that we got here with base as a different type.
1401
# if so, we just want two-way text conflicts.
1402
if self.base_tree.has_id(file_id) and \
1403
self.base_tree.kind(file_id) == "file":
1404
base_lines = self.get_lines(self.base_tree, file_id)
1407
other_lines = self.get_lines(self.other_tree, file_id)
1408
this_lines = self.get_lines(self.this_tree, file_id)
1409
m3 = merge3.Merge3(base_lines, this_lines, other_lines,
1410
is_cherrypick=self.cherrypick)
1411
start_marker = "!START OF MERGE CONFLICT!" + "I HOPE THIS IS UNIQUE"
1412
if self.show_base is True:
1413
base_marker = '|' * 7
1417
def iter_merge3(retval):
1418
retval["text_conflicts"] = False
1419
for line in m3.merge_lines(name_a = "TREE",
1420
name_b = "MERGE-SOURCE",
1421
name_base = "BASE-REVISION",
1422
start_marker=start_marker,
1423
base_marker=base_marker,
1424
reprocess=self.reprocess):
1425
if line.startswith(start_marker):
1426
retval["text_conflicts"] = True
1427
yield line.replace(start_marker, '<' * 7)
1431
merge3_iterator = iter_merge3(retval)
1432
self.tt.create_file(merge3_iterator, trans_id)
1433
if retval["text_conflicts"] is True:
1434
self._raw_conflicts.append(('text conflict', trans_id))
1435
name = self.tt.final_name(trans_id)
1436
parent_id = self.tt.final_parent(trans_id)
1437
file_group = self._dump_conflicts(name, parent_id, file_id,
1438
this_lines, base_lines,
1440
file_group.append(trans_id)
1442
def _dump_conflicts(self, name, parent_id, file_id, this_lines=None,
1443
base_lines=None, other_lines=None, set_version=False,
1445
"""Emit conflict files.
1446
If this_lines, base_lines, or other_lines are omitted, they will be
1447
determined automatically. If set_version is true, the .OTHER, .THIS
1448
or .BASE (in that order) will be created as versioned files.
1450
data = [('OTHER', self.other_tree, other_lines),
1451
('THIS', self.this_tree, this_lines)]
1453
data.append(('BASE', self.base_tree, base_lines))
1455
# We need to use the actual path in the working tree of the file here,
1456
# ignoring the conflict suffixes
1458
if wt.supports_content_filtering():
1460
filter_tree_path = wt.id2path(file_id)
1461
except errors.NoSuchId:
1462
# file has been deleted
1463
filter_tree_path = None
1465
# Skip the id2path lookup for older formats
1466
filter_tree_path = None
1470
for suffix, tree, lines in data:
1471
if tree.has_id(file_id):
1472
trans_id = self._conflict_file(name, parent_id, tree, file_id,
1473
suffix, lines, filter_tree_path)
1474
file_group.append(trans_id)
1475
if set_version and not versioned:
1476
self.tt.version_file(file_id, trans_id)
1480
def _conflict_file(self, name, parent_id, tree, file_id, suffix,
1481
lines=None, filter_tree_path=None):
1482
"""Emit a single conflict file."""
1483
name = name + '.' + suffix
1484
trans_id = self.tt.create_path(name, parent_id)
1485
transform.create_from_tree(self.tt, trans_id, tree, file_id, lines,
1489
def merge_executable(self, file_id, file_status):
1490
"""Perform a merge on the execute bit."""
1491
executable = [self.executable(t, file_id) for t in (self.base_tree,
1492
self.other_tree, self.this_tree)]
1493
self._merge_executable(file_id, executable, file_status,
1494
resolver=self._three_way)
1496
def _merge_executable(self, file_id, executable, file_status,
1498
"""Perform a merge on the execute bit."""
1499
base_executable, other_executable, this_executable = executable
1500
if file_status == "deleted":
1502
winner = resolver(*executable)
1503
if winner == "conflict":
1504
# There must be a None in here, if we have a conflict, but we
1505
# need executability since file status was not deleted.
1506
if self.executable(self.other_tree, file_id) is None:
1510
if winner == 'this' and file_status != "modified":
1512
trans_id = self.tt.trans_id_file_id(file_id)
1514
if self.tt.final_kind(trans_id) != "file":
1516
except errors.NoSuchFile:
1518
if winner == "this":
1519
executability = this_executable
1521
if self.other_tree.has_id(file_id):
1522
executability = other_executable
1523
elif self.this_tree.has_id(file_id):
1524
executability = this_executable
1525
elif self.base_tree_has_id(file_id):
1526
executability = base_executable
1527
if executability is not None:
1528
trans_id = self.tt.trans_id_file_id(file_id)
1529
self.tt.set_executability(executability, trans_id)
1531
def cook_conflicts(self, fs_conflicts):
1532
"""Convert all conflicts into a form that doesn't depend on trans_id"""
1533
self.cooked_conflicts.extend(transform.cook_conflicts(
1534
fs_conflicts, self.tt))
1535
fp = transform.FinalPaths(self.tt)
1536
for conflict in self._raw_conflicts:
1537
conflict_type = conflict[0]
1538
if conflict_type == 'path conflict':
1540
this_parent, this_name,
1541
other_parent, other_name) = conflict[1:]
1542
if this_parent is None or this_name is None:
1543
this_path = '<deleted>'
1545
parent_path = fp.get_path(
1546
self.tt.trans_id_file_id(this_parent))
1547
this_path = osutils.pathjoin(parent_path, this_name)
1548
if other_parent is None or other_name is None:
1549
other_path = '<deleted>'
1551
parent_path = fp.get_path(
1552
self.tt.trans_id_file_id(other_parent))
1553
other_path = osutils.pathjoin(parent_path, other_name)
1554
c = _mod_conflicts.Conflict.factory(
1555
'path conflict', path=this_path,
1556
conflict_path=other_path,
1558
elif conflict_type == 'contents conflict':
1559
for trans_id in conflict[1]:
1560
file_id = self.tt.final_file_id(trans_id)
1561
if file_id is not None:
1563
path = fp.get_path(trans_id)
1564
for suffix in ('.BASE', '.THIS', '.OTHER'):
1565
if path.endswith(suffix):
1566
path = path[:-len(suffix)]
1568
c = _mod_conflicts.Conflict.factory(conflict_type,
1569
path=path, file_id=file_id)
1570
elif conflict_type == 'text conflict':
1571
trans_id = conflict[1]
1572
path = fp.get_path(trans_id)
1573
file_id = self.tt.final_file_id(trans_id)
1574
c = _mod_conflicts.Conflict.factory(conflict_type,
1575
path=path, file_id=file_id)
1577
raise AssertionError()
1578
self.cooked_conflicts.append(c)
1580
self.cooked_conflicts.sort(key=_mod_conflicts.Conflict.sort_key)
1583
class WeaveMerger(Merge3Merger):
1584
"""Three-way tree merger, text weave merger."""
1585
supports_reprocess = True
1586
supports_show_base = False
1587
supports_reverse_cherrypick = False
1588
history_based = True
1590
def _generate_merge_plan(self, file_id, base):
1591
return self.this_tree.plan_file_merge(file_id, self.other_tree,
1594
def _merged_lines(self, file_id):
1595
"""Generate the merged lines.
1596
There is no distinction between lines that are meant to contain <<<<<<<
1600
base = self.base_tree
1603
plan = self._generate_merge_plan(file_id, base)
1604
if 'merge' in debug.debug_flags:
1606
trans_id = self.tt.trans_id_file_id(file_id)
1607
name = self.tt.final_name(trans_id) + '.plan'
1608
contents = ('%11s|%s' % l for l in plan)
1609
self.tt.new_file(name, self.tt.final_parent(trans_id), contents)
1610
textmerge = versionedfile.PlanWeaveMerge(plan, '<<<<<<< TREE\n',
1611
'>>>>>>> MERGE-SOURCE\n')
1612
lines, conflicts = textmerge.merge_lines(self.reprocess)
1614
base_lines = textmerge.base_from_plan()
1617
return lines, base_lines
1619
def text_merge(self, file_id, trans_id):
1620
"""Perform a (weave) text merge for a given file and file-id.
1621
If conflicts are encountered, .THIS and .OTHER files will be emitted,
1622
and a conflict will be noted.
1624
lines, base_lines = self._merged_lines(file_id)
1626
# Note we're checking whether the OUTPUT is binary in this case,
1627
# because we don't want to get into weave merge guts.
1628
textfile.check_text_lines(lines)
1629
self.tt.create_file(lines, trans_id)
1630
if base_lines is not None:
1632
self._raw_conflicts.append(('text conflict', trans_id))
1633
name = self.tt.final_name(trans_id)
1634
parent_id = self.tt.final_parent(trans_id)
1635
file_group = self._dump_conflicts(name, parent_id, file_id,
1637
base_lines=base_lines)
1638
file_group.append(trans_id)
1641
class LCAMerger(WeaveMerger):
1643
def _generate_merge_plan(self, file_id, base):
1644
return self.this_tree.plan_file_lca_merge(file_id, self.other_tree,
1647
class Diff3Merger(Merge3Merger):
1648
"""Three-way merger using external diff3 for text merging"""
1650
def dump_file(self, temp_dir, name, tree, file_id):
1651
out_path = osutils.pathjoin(temp_dir, name)
1652
out_file = open(out_path, "wb")
1654
in_file = tree.get_file(file_id)
1655
for line in in_file:
1656
out_file.write(line)
1661
def text_merge(self, file_id, trans_id):
1662
"""Perform a diff3 merge using a specified file-id and trans-id.
1663
If conflicts are encountered, .BASE, .THIS. and .OTHER conflict files
1664
will be dumped, and a will be conflict noted.
1667
temp_dir = osutils.mkdtemp(prefix="bzr-")
1669
new_file = osutils.pathjoin(temp_dir, "new")
1670
this = self.dump_file(temp_dir, "this", self.this_tree, file_id)
1671
base = self.dump_file(temp_dir, "base", self.base_tree, file_id)
1672
other = self.dump_file(temp_dir, "other", self.other_tree, file_id)
1673
status = bzrlib.patch.diff3(new_file, this, base, other)
1674
if status not in (0, 1):
1675
raise errors.BzrError("Unhandled diff3 exit code")
1676
f = open(new_file, 'rb')
1678
self.tt.create_file(f, trans_id)
1682
name = self.tt.final_name(trans_id)
1683
parent_id = self.tt.final_parent(trans_id)
1684
self._dump_conflicts(name, parent_id, file_id)
1685
self._raw_conflicts.append(('text conflict', trans_id))
1687
osutils.rmtree(temp_dir)
1690
def merge_inner(this_branch, other_tree, base_tree, ignore_zero=False,
1692
merge_type=Merge3Merger,
1693
interesting_ids=None,
1697
interesting_files=None,
1700
change_reporter=None):
1701
"""Primary interface for merging.
1703
typical use is probably
1704
'merge_inner(branch, branch.get_revision_tree(other_revision),
1705
branch.get_revision_tree(base_revision))'
1707
if this_tree is None:
1708
raise errors.BzrError("bzrlib.merge.merge_inner requires a this_tree "
1709
"parameter as of bzrlib version 0.8.")
1710
merger = Merger(this_branch, other_tree, base_tree, this_tree=this_tree,
1711
pb=pb, change_reporter=change_reporter)
1712
merger.backup_files = backup_files
1713
merger.merge_type = merge_type
1714
merger.interesting_ids = interesting_ids
1715
merger.ignore_zero = ignore_zero
1716
if interesting_files:
1718
raise ValueError('Only supply interesting_ids'
1719
' or interesting_files')
1720
merger.interesting_files = interesting_files
1721
merger.show_base = show_base
1722
merger.reprocess = reprocess
1723
merger.other_rev_id = other_rev_id
1724
merger.other_basis = other_rev_id
1725
get_revision_id = getattr(base_tree, 'get_revision_id', None)
1726
if get_revision_id is None:
1727
get_revision_id = base_tree.last_revision
1728
merger.cache_trees_with_revision_ids([other_tree, base_tree, this_tree])
1729
merger.set_base_revision(get_revision_id(), this_branch)
1730
return merger.do_merge()
1732
def get_merge_type_registry():
1733
"""Merge type registry is in bzrlib.option to avoid circular imports.
1735
This method provides a sanctioned way to retrieve it.
1737
from bzrlib import option
1738
return option._merge_type_registry
1741
def _plan_annotate_merge(annotated_a, annotated_b, ancestors_a, ancestors_b):
1742
def status_a(revision, text):
1743
if revision in ancestors_b:
1744
return 'killed-b', text
1746
return 'new-a', text
1748
def status_b(revision, text):
1749
if revision in ancestors_a:
1750
return 'killed-a', text
1752
return 'new-b', text
1754
plain_a = [t for (a, t) in annotated_a]
1755
plain_b = [t for (a, t) in annotated_b]
1756
matcher = patiencediff.PatienceSequenceMatcher(None, plain_a, plain_b)
1757
blocks = matcher.get_matching_blocks()
1760
for ai, bi, l in blocks:
1761
# process all mismatched sections
1762
# (last mismatched section is handled because blocks always
1763
# includes a 0-length last block)
1764
for revision, text in annotated_a[a_cur:ai]:
1765
yield status_a(revision, text)
1766
for revision, text in annotated_b[b_cur:bi]:
1767
yield status_b(revision, text)
1768
# and now the matched section
1771
for text_a in plain_a[ai:a_cur]:
1772
yield "unchanged", text_a
1775
class _PlanMergeBase(object):
1777
def __init__(self, a_rev, b_rev, vf, key_prefix):
1780
:param a_rev: Revision-id of one revision to merge
1781
:param b_rev: Revision-id of the other revision to merge
1782
:param vf: A VersionedFiles containing both revisions
1783
:param key_prefix: A prefix for accessing keys in vf, typically
1789
self._last_lines = None
1790
self._last_lines_revision_id = None
1791
self._cached_matching_blocks = {}
1792
self._key_prefix = key_prefix
1793
self._precache_tip_lines()
1795
def _precache_tip_lines(self):
1796
lines = self.get_lines([self.a_rev, self.b_rev])
1797
self.lines_a = lines[self.a_rev]
1798
self.lines_b = lines[self.b_rev]
1800
def get_lines(self, revisions):
1801
"""Get lines for revisions from the backing VersionedFiles.
1803
:raises RevisionNotPresent: on absent texts.
1805
keys = [(self._key_prefix + (rev,)) for rev in revisions]
1807
for record in self.vf.get_record_stream(keys, 'unordered', True):
1808
if record.storage_kind == 'absent':
1809
raise errors.RevisionNotPresent(record.key, self.vf)
1810
result[record.key[-1]] = osutils.chunks_to_lines(
1811
record.get_bytes_as('chunked'))
1814
def plan_merge(self):
1815
"""Generate a 'plan' for merging the two revisions.
1817
This involves comparing their texts and determining the cause of
1818
differences. If text A has a line and text B does not, then either the
1819
line was added to text A, or it was deleted from B. Once the causes
1820
are combined, they are written out in the format described in
1821
VersionedFile.plan_merge
1823
blocks = self._get_matching_blocks(self.a_rev, self.b_rev)
1824
unique_a, unique_b = self._unique_lines(blocks)
1825
new_a, killed_b = self._determine_status(self.a_rev, unique_a)
1826
new_b, killed_a = self._determine_status(self.b_rev, unique_b)
1827
return self._iter_plan(blocks, new_a, killed_b, new_b, killed_a)
1829
def _iter_plan(self, blocks, new_a, killed_b, new_b, killed_a):
1832
for i, j, n in blocks:
1833
for a_index in range(last_i, i):
1834
if a_index in new_a:
1835
if a_index in killed_b:
1836
yield 'conflicted-a', self.lines_a[a_index]
1838
yield 'new-a', self.lines_a[a_index]
1840
yield 'killed-b', self.lines_a[a_index]
1841
for b_index in range(last_j, j):
1842
if b_index in new_b:
1843
if b_index in killed_a:
1844
yield 'conflicted-b', self.lines_b[b_index]
1846
yield 'new-b', self.lines_b[b_index]
1848
yield 'killed-a', self.lines_b[b_index]
1849
# handle common lines
1850
for a_index in range(i, i+n):
1851
yield 'unchanged', self.lines_a[a_index]
1855
def _get_matching_blocks(self, left_revision, right_revision):
1856
"""Return a description of which sections of two revisions match.
1858
See SequenceMatcher.get_matching_blocks
1860
cached = self._cached_matching_blocks.get((left_revision,
1862
if cached is not None:
1864
if self._last_lines_revision_id == left_revision:
1865
left_lines = self._last_lines
1866
right_lines = self.get_lines([right_revision])[right_revision]
1868
lines = self.get_lines([left_revision, right_revision])
1869
left_lines = lines[left_revision]
1870
right_lines = lines[right_revision]
1871
self._last_lines = right_lines
1872
self._last_lines_revision_id = right_revision
1873
matcher = patiencediff.PatienceSequenceMatcher(None, left_lines,
1875
return matcher.get_matching_blocks()
1877
def _unique_lines(self, matching_blocks):
1878
"""Analyse matching_blocks to determine which lines are unique
1880
:return: a tuple of (unique_left, unique_right), where the values are
1881
sets of line numbers of unique lines.
1887
for i, j, n in matching_blocks:
1888
unique_left.extend(range(last_i, i))
1889
unique_right.extend(range(last_j, j))
1892
return unique_left, unique_right
1895
def _subtract_plans(old_plan, new_plan):
1896
"""Remove changes from new_plan that came from old_plan.
1898
It is assumed that the difference between the old_plan and new_plan
1899
is their choice of 'b' text.
1901
All lines from new_plan that differ from old_plan are emitted
1902
verbatim. All lines from new_plan that match old_plan but are
1903
not about the 'b' revision are emitted verbatim.
1905
Lines that match and are about the 'b' revision are the lines we
1906
don't want, so we convert 'killed-b' -> 'unchanged', and 'new-b'
1907
is skipped entirely.
1909
matcher = patiencediff.PatienceSequenceMatcher(None, old_plan,
1912
for i, j, n in matcher.get_matching_blocks():
1913
for jj in range(last_j, j):
1915
for jj in range(j, j+n):
1916
plan_line = new_plan[jj]
1917
if plan_line[0] == 'new-b':
1919
elif plan_line[0] == 'killed-b':
1920
yield 'unchanged', plan_line[1]
1926
class _PlanMerge(_PlanMergeBase):
1927
"""Plan an annotate merge using on-the-fly annotation"""
1929
def __init__(self, a_rev, b_rev, vf, key_prefix):
1930
super(_PlanMerge, self).__init__(a_rev, b_rev, vf, key_prefix)
1931
self.a_key = self._key_prefix + (self.a_rev,)
1932
self.b_key = self._key_prefix + (self.b_rev,)
1933
self.graph = _mod_graph.Graph(self.vf)
1934
heads = self.graph.heads((self.a_key, self.b_key))
1936
# one side dominates, so we can just return its values, yay for
1938
# Ideally we would know that before we get this far
1939
self._head_key = heads.pop()
1940
if self._head_key == self.a_key:
1944
trace.mutter('found dominating revision for %s\n%s > %s', self.vf,
1945
self._head_key[-1], other)
1948
self._head_key = None
1951
def _precache_tip_lines(self):
1952
# Turn this into a no-op, because we will do this later
1955
def _find_recursive_lcas(self):
1956
"""Find all the ancestors back to a unique lca"""
1957
cur_ancestors = (self.a_key, self.b_key)
1958
# graph.find_lca(uncommon, keys) now returns plain NULL_REVISION,
1959
# rather than a key tuple. We will just map that directly to no common
1963
next_lcas = self.graph.find_lca(*cur_ancestors)
1964
# Map a plain NULL_REVISION to a simple no-ancestors
1965
if next_lcas == set([_mod_revision.NULL_REVISION]):
1967
# Order the lca's based on when they were merged into the tip
1968
# While the actual merge portion of weave merge uses a set() of
1969
# active revisions, the order of insertion *does* effect the
1970
# implicit ordering of the texts.
1971
for rev_key in cur_ancestors:
1972
ordered_parents = tuple(self.graph.find_merge_order(rev_key,
1974
parent_map[rev_key] = ordered_parents
1975
if len(next_lcas) == 0:
1977
elif len(next_lcas) == 1:
1978
parent_map[list(next_lcas)[0]] = ()
1980
elif len(next_lcas) > 2:
1981
# More than 2 lca's, fall back to grabbing all nodes between
1982
# this and the unique lca.
1983
trace.mutter('More than 2 LCAs, falling back to all nodes for:'
1985
self.a_key, self.b_key, cur_ancestors)
1986
cur_lcas = next_lcas
1987
while len(cur_lcas) > 1:
1988
cur_lcas = self.graph.find_lca(*cur_lcas)
1989
if len(cur_lcas) == 0:
1990
# No common base to find, use the full ancestry
1993
unique_lca = list(cur_lcas)[0]
1994
if unique_lca == _mod_revision.NULL_REVISION:
1995
# find_lca will return a plain 'NULL_REVISION' rather
1996
# than a key tuple when there is no common ancestor, we
1997
# prefer to just use None, because it doesn't confuse
1998
# _get_interesting_texts()
2000
parent_map.update(self._find_unique_parents(next_lcas,
2003
cur_ancestors = next_lcas
2006
def _find_unique_parents(self, tip_keys, base_key):
2007
"""Find ancestors of tip that aren't ancestors of base.
2009
:param tip_keys: Nodes that are interesting
2010
:param base_key: Cull all ancestors of this node
2011
:return: The parent map for all revisions between tip_keys and
2012
base_key. base_key will be included. References to nodes outside of
2013
the ancestor set will also be removed.
2015
# TODO: this would be simpler if find_unique_ancestors took a list
2016
# instead of a single tip, internally it supports it, but it
2017
# isn't a "backwards compatible" api change.
2018
if base_key is None:
2019
parent_map = dict(self.graph.iter_ancestry(tip_keys))
2020
# We remove NULL_REVISION because it isn't a proper tuple key, and
2021
# thus confuses things like _get_interesting_texts, and our logic
2022
# to add the texts into the memory weave.
2023
if _mod_revision.NULL_REVISION in parent_map:
2024
parent_map.pop(_mod_revision.NULL_REVISION)
2027
for tip in tip_keys:
2029
self.graph.find_unique_ancestors(tip, [base_key]))
2030
parent_map = self.graph.get_parent_map(interesting)
2031
parent_map[base_key] = ()
2032
culled_parent_map, child_map, tails = self._remove_external_references(
2034
# Remove all the tails but base_key
2035
if base_key is not None:
2036
tails.remove(base_key)
2037
self._prune_tails(culled_parent_map, child_map, tails)
2038
# Now remove all the uninteresting 'linear' regions
2039
simple_map = _mod_graph.collapse_linear_regions(culled_parent_map)
2043
def _remove_external_references(parent_map):
2044
"""Remove references that go outside of the parent map.
2046
:param parent_map: Something returned from Graph.get_parent_map(keys)
2047
:return: (filtered_parent_map, child_map, tails)
2048
filtered_parent_map is parent_map without external references
2049
child_map is the {parent_key: [child_keys]} mapping
2050
tails is a list of nodes that do not have any parents in the map
2052
# TODO: The basic effect of this function seems more generic than
2053
# _PlanMerge. But the specific details of building a child_map,
2054
# and computing tails seems very specific to _PlanMerge.
2055
# Still, should this be in Graph land?
2056
filtered_parent_map = {}
2059
for key, parent_keys in parent_map.iteritems():
2060
culled_parent_keys = [p for p in parent_keys if p in parent_map]
2061
if not culled_parent_keys:
2063
for parent_key in culled_parent_keys:
2064
child_map.setdefault(parent_key, []).append(key)
2065
# TODO: Do we want to do this, it adds overhead for every node,
2066
# just to say that the node has no children
2067
child_map.setdefault(key, [])
2068
filtered_parent_map[key] = culled_parent_keys
2069
return filtered_parent_map, child_map, tails
2072
def _prune_tails(parent_map, child_map, tails_to_remove):
2073
"""Remove tails from the parent map.
2075
This will remove the supplied revisions until no more children have 0
2078
:param parent_map: A dict of {child: [parents]}, this dictionary will
2079
be modified in place.
2080
:param tails_to_remove: A list of tips that should be removed,
2081
this list will be consumed
2082
:param child_map: The reverse dict of parent_map ({parent: [children]})
2083
this dict will be modified
2084
:return: None, parent_map will be modified in place.
2086
while tails_to_remove:
2087
next = tails_to_remove.pop()
2088
parent_map.pop(next)
2089
children = child_map.pop(next)
2090
for child in children:
2091
child_parents = parent_map[child]
2092
child_parents.remove(next)
2093
if len(child_parents) == 0:
2094
tails_to_remove.append(child)
2096
def _get_interesting_texts(self, parent_map):
2097
"""Return a dict of texts we are interested in.
2099
Note that the input is in key tuples, but the output is in plain
2102
:param parent_map: The output from _find_recursive_lcas
2103
:return: A dict of {'revision_id':lines} as returned by
2104
_PlanMergeBase.get_lines()
2106
all_revision_keys = set(parent_map)
2107
all_revision_keys.add(self.a_key)
2108
all_revision_keys.add(self.b_key)
2110
# Everything else is in 'keys' but get_lines is in 'revision_ids'
2111
all_texts = self.get_lines([k[-1] for k in all_revision_keys])
2114
def _build_weave(self):
2115
from bzrlib import weave
2116
self._weave = weave.Weave(weave_name='in_memory_weave',
2117
allow_reserved=True)
2118
parent_map = self._find_recursive_lcas()
2120
all_texts = self._get_interesting_texts(parent_map)
2122
# Note: Unfortunately, the order given by topo_sort will effect the
2123
# ordering resolution in the output. Specifically, if you add A then B,
2124
# then in the output text A lines will show up before B lines. And, of
2125
# course, topo_sort doesn't guarantee any real ordering.
2126
# So we use merge_sort, and add a fake node on the tip.
2127
# This ensures that left-hand parents will always be inserted into the
2128
# weave before right-hand parents.
2129
tip_key = self._key_prefix + (_mod_revision.CURRENT_REVISION,)
2130
parent_map[tip_key] = (self.a_key, self.b_key)
2132
for seq_num, key, depth, eom in reversed(tsort.merge_sort(parent_map,
2136
# for key in tsort.topo_sort(parent_map):
2137
parent_keys = parent_map[key]
2138
revision_id = key[-1]
2139
parent_ids = [k[-1] for k in parent_keys]
2140
self._weave.add_lines(revision_id, parent_ids,
2141
all_texts[revision_id])
2143
def plan_merge(self):
2144
"""Generate a 'plan' for merging the two revisions.
2146
This involves comparing their texts and determining the cause of
2147
differences. If text A has a line and text B does not, then either the
2148
line was added to text A, or it was deleted from B. Once the causes
2149
are combined, they are written out in the format described in
2150
VersionedFile.plan_merge
2152
if self._head_key is not None: # There was a single head
2153
if self._head_key == self.a_key:
2156
if self._head_key != self.b_key:
2157
raise AssertionError('There was an invalid head: %s != %s'
2158
% (self.b_key, self._head_key))
2160
head_rev = self._head_key[-1]
2161
lines = self.get_lines([head_rev])[head_rev]
2162
return ((plan, line) for line in lines)
2163
return self._weave.plan_merge(self.a_rev, self.b_rev)
2166
class _PlanLCAMerge(_PlanMergeBase):
2168
This merge algorithm differs from _PlanMerge in that:
2169
1. comparisons are done against LCAs only
2170
2. cases where a contested line is new versus one LCA but old versus
2171
another are marked as conflicts, by emitting the line as conflicted-a
2174
This is faster, and hopefully produces more useful output.
2177
def __init__(self, a_rev, b_rev, vf, key_prefix, graph):
2178
_PlanMergeBase.__init__(self, a_rev, b_rev, vf, key_prefix)
2179
lcas = graph.find_lca(key_prefix + (a_rev,), key_prefix + (b_rev,))
2182
if lca == _mod_revision.NULL_REVISION:
2185
self.lcas.add(lca[-1])
2186
for lca in self.lcas:
2187
if _mod_revision.is_null(lca):
2190
lca_lines = self.get_lines([lca])[lca]
2191
matcher = patiencediff.PatienceSequenceMatcher(None, self.lines_a,
2193
blocks = list(matcher.get_matching_blocks())
2194
self._cached_matching_blocks[(a_rev, lca)] = blocks
2195
matcher = patiencediff.PatienceSequenceMatcher(None, self.lines_b,
2197
blocks = list(matcher.get_matching_blocks())
2198
self._cached_matching_blocks[(b_rev, lca)] = blocks
2200
def _determine_status(self, revision_id, unique_line_numbers):
2201
"""Determines the status unique lines versus all lcas.
2203
Basically, determines why the line is unique to this revision.
2205
A line may be determined new, killed, or both.
2207
If a line is determined new, that means it was not present in at least
2208
one LCA, and is not present in the other merge revision.
2210
If a line is determined killed, that means the line was present in
2213
If a line is killed and new, this indicates that the two merge
2214
revisions contain differing conflict resolutions.
2215
:param revision_id: The id of the revision in which the lines are
2217
:param unique_line_numbers: The line numbers of unique lines.
2218
:return a tuple of (new_this, killed_other):
2222
unique_line_numbers = set(unique_line_numbers)
2223
for lca in self.lcas:
2224
blocks = self._get_matching_blocks(revision_id, lca)
2225
unique_vs_lca, _ignored = self._unique_lines(blocks)
2226
new.update(unique_line_numbers.intersection(unique_vs_lca))
2227
killed.update(unique_line_numbers.difference(unique_vs_lca))
added
removed
bzrlib/merge.py
