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# Copyright (C) 2005-2010 Canonical Ltd
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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branch as _mod_branch,
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conflicts as _mod_conflicts,
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revision as _mod_revision,
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from bzrlib.cleanup import OperationWithCleanups
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from bzrlib.symbol_versioning import (
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# TODO: Report back as changes are merged in
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def transform_tree(from_tree, to_tree, interesting_ids=None):
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from_tree.lock_tree_write()
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operation = OperationWithCleanups(merge_inner)
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operation.add_cleanup(from_tree.unlock)
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operation.run_simple(from_tree.branch, to_tree, from_tree,
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ignore_zero=True, interesting_ids=interesting_ids, this_tree=from_tree)
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class MergeHooks(hooks.Hooks):
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hooks.Hooks.__init__(self)
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self.create_hook(hooks.HookPoint('merge_file_content',
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"Called with a bzrlib.merge.Merger object to create a per file "
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"merge object when starting a merge. "
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"Should return either None or a subclass of "
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"``bzrlib.merge.AbstractPerFileMerger``. "
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"Such objects will then be called per file "
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"that needs to be merged (including when one "
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"side has deleted the file and the other has changed it). "
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"See the AbstractPerFileMerger API docs for details on how it is "
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class AbstractPerFileMerger(object):
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"""PerFileMerger objects are used by plugins extending merge for bzrlib.
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See ``bzrlib.plugins.news_merge.news_merge`` for an example concrete class.
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:ivar merger: The Merge3Merger performing the merge.
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def __init__(self, merger):
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"""Create a PerFileMerger for use with merger."""
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def merge_contents(self, merge_params):
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"""Attempt to merge the contents of a single file.
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:param merge_params: A bzrlib.merge.MergeHookParams
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:return : A tuple of (status, chunks), where status is one of
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'not_applicable', 'success', 'conflicted', or 'delete'. If status
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is 'success' or 'conflicted', then chunks should be an iterable of
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strings for the new file contents.
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return ('not applicable', None)
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class ConfigurableFileMerger(AbstractPerFileMerger):
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"""Merge individual files when configured via a .conf file.
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This is a base class for concrete custom file merging logic. Concrete
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classes should implement ``merge_text``.
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See ``bzrlib.plugins.news_merge.news_merge`` for an example concrete class.
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:ivar affected_files: The configured file paths to merge.
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:cvar name_prefix: The prefix to use when looking up configuration
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details. <name_prefix>_merge_files describes the files targeted by the
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:cvar default_files: The default file paths to merge when no configuration
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def __init__(self, merger):
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super(ConfigurableFileMerger, self).__init__(merger)
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self.affected_files = None
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self.default_files = self.__class__.default_files or []
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self.name_prefix = self.__class__.name_prefix
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if self.name_prefix is None:
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raise ValueError("name_prefix must be set.")
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def filename_matches_config(self, params):
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"""Check whether the file should call the merge hook.
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<name_prefix>_merge_files configuration variable is a list of files
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that should use the hook.
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affected_files = self.affected_files
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if affected_files is None:
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config = self.merger.this_branch.get_config()
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# Until bzr provides a better policy for caching the config, we
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# just add the part we're interested in to the params to avoid
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# reading the config files repeatedly (bazaar.conf, location.conf,
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config_key = self.name_prefix + '_merge_files'
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affected_files = config.get_user_option_as_list(config_key)
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if affected_files is None:
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# If nothing was specified in the config, use the default.
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affected_files = self.default_files
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self.affected_files = affected_files
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filename = self.merger.this_tree.id2path(params.file_id)
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if filename in affected_files:
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def merge_contents(self, params):
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"""Merge the contents of a single file."""
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# First, check whether this custom merge logic should be used. We
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# expect most files should not be merged by this handler.
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# OTHER is a straight winner, rely on default merge.
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params.winner == 'other' or
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# THIS and OTHER aren't both files.
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not params.is_file_merge() or
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# The filename isn't listed in the 'NAME_merge_files' config
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not self.filename_matches_config(params)):
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return 'not_applicable', None
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return self.merge_text(params)
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def merge_text(self, params):
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"""Merge the byte contents of a single file.
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This is called after checking that the merge should be performed in
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merge_contents, and it should behave as per
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``bzrlib.merge.AbstractPerFileMerger.merge_contents``.
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raise NotImplementedError(self.merge_text)
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class MergeHookParams(object):
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"""Object holding parameters passed to merge_file_content hooks.
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There are some fields hooks can access:
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:ivar file_id: the file ID of the file being merged
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:ivar trans_id: the transform ID for the merge of this file
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:ivar this_kind: kind of file_id in 'this' tree
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:ivar other_kind: kind of file_id in 'other' tree
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:ivar winner: one of 'this', 'other', 'conflict'
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def __init__(self, merger, file_id, trans_id, this_kind, other_kind,
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self._merger = merger
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self.file_id = file_id
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self.trans_id = trans_id
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self.this_kind = this_kind
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self.other_kind = other_kind
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def is_file_merge(self):
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"""True if this_kind and other_kind are both 'file'."""
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return self.this_kind == 'file' and self.other_kind == 'file'
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@decorators.cachedproperty
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def base_lines(self):
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"""The lines of the 'base' version of the file."""
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return self._merger.get_lines(self._merger.base_tree, self.file_id)
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@decorators.cachedproperty
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def this_lines(self):
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"""The lines of the 'this' version of the file."""
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return self._merger.get_lines(self._merger.this_tree, self.file_id)
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@decorators.cachedproperty
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def other_lines(self):
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"""The lines of the 'other' version of the file."""
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return self._merger.get_lines(self._merger.other_tree, self.file_id)
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class Merger(object):
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def __init__(self, this_branch, other_tree=None, base_tree=None,
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this_tree=None, pb=None, change_reporter=None,
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recurse='down', revision_graph=None):
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object.__init__(self)
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self.this_branch = this_branch
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self.this_basis = _mod_revision.ensure_null(
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this_branch.last_revision())
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self.this_rev_id = None
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self.this_tree = this_tree
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self.this_revision_tree = None
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self.this_basis_tree = None
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self.other_tree = other_tree
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self.other_branch = None
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self.base_tree = base_tree
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self.ignore_zero = False
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self.backup_files = False
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self.interesting_ids = None
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self.interesting_files = None
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self.show_base = False
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self.reprocess = False
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warnings.warn("pb parameter to Merger() is deprecated and ignored")
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self.recurse = recurse
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self.change_reporter = change_reporter
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self._cached_trees = {}
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self._revision_graph = revision_graph
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self._base_is_ancestor = None
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self._base_is_other_ancestor = None
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self._is_criss_cross = None
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self._lca_trees = None
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def cache_trees_with_revision_ids(self, trees):
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"""Cache any tree in trees if it has a revision_id."""
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for maybe_tree in trees:
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if maybe_tree is None:
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rev_id = maybe_tree.get_revision_id()
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except AttributeError:
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self._cached_trees[rev_id] = maybe_tree
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def revision_graph(self):
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if self._revision_graph is None:
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self._revision_graph = self.this_branch.repository.get_graph()
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return self._revision_graph
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def _set_base_is_ancestor(self, value):
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self._base_is_ancestor = value
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def _get_base_is_ancestor(self):
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if self._base_is_ancestor is None:
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self._base_is_ancestor = self.revision_graph.is_ancestor(
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self.base_rev_id, self.this_basis)
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return self._base_is_ancestor
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base_is_ancestor = property(_get_base_is_ancestor, _set_base_is_ancestor)
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def _set_base_is_other_ancestor(self, value):
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self._base_is_other_ancestor = value
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def _get_base_is_other_ancestor(self):
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if self._base_is_other_ancestor is None:
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if self.other_basis is None:
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self._base_is_other_ancestor = self.revision_graph.is_ancestor(
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self.base_rev_id, self.other_basis)
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return self._base_is_other_ancestor
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base_is_other_ancestor = property(_get_base_is_other_ancestor,
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_set_base_is_other_ancestor)
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def from_uncommitted(tree, other_tree, pb=None, base_tree=None):
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"""Return a Merger for uncommitted changes in other_tree.
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:param tree: The tree to merge into
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:param other_tree: The tree to get uncommitted changes from
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:param pb: A progress indicator
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:param base_tree: The basis to use for the merge. If unspecified,
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other_tree.basis_tree() will be used.
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if base_tree is None:
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base_tree = other_tree.basis_tree()
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merger = Merger(tree.branch, other_tree, base_tree, tree, pb)
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merger.base_rev_id = merger.base_tree.get_revision_id()
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merger.other_rev_id = None
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merger.other_basis = merger.base_rev_id
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def from_mergeable(klass, tree, mergeable, pb):
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"""Return a Merger for a bundle or merge directive.
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:param tree: The tree to merge changes into
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:param mergeable: A merge directive or bundle
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:param pb: A progress indicator
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mergeable.install_revisions(tree.branch.repository)
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base_revision_id, other_revision_id, verified =\
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mergeable.get_merge_request(tree.branch.repository)
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revision_graph = tree.branch.repository.get_graph()
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if base_revision_id is not None:
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if (base_revision_id != _mod_revision.NULL_REVISION and
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revision_graph.is_ancestor(
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base_revision_id, tree.branch.last_revision())):
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base_revision_id = None
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trace.warning('Performing cherrypick')
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merger = klass.from_revision_ids(pb, tree, other_revision_id,
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base_revision_id, revision_graph=
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return merger, verified
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def from_revision_ids(pb, tree, other, base=None, other_branch=None,
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base_branch=None, revision_graph=None,
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"""Return a Merger for revision-ids.
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:param pb: A progress indicator
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:param tree: The tree to merge changes into
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:param other: The revision-id to use as OTHER
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:param base: The revision-id to use as BASE. If not specified, will
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:param other_branch: A branch containing the other revision-id. If
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not supplied, tree.branch is used.
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:param base_branch: A branch containing the base revision-id. If
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not supplied, other_branch or tree.branch will be used.
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:param revision_graph: If you have a revision_graph precomputed, pass
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it in, otherwise it will be created for you.
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:param tree_branch: The branch associated with tree. If not supplied,
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tree.branch will be used.
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if tree_branch is None:
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tree_branch = tree.branch
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merger = Merger(tree_branch, this_tree=tree, pb=pb,
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revision_graph=revision_graph)
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if other_branch is None:
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other_branch = tree.branch
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merger.set_other_revision(other, other_branch)
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if base_branch is None:
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base_branch = other_branch
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merger.set_base_revision(base, base_branch)
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def revision_tree(self, revision_id, branch=None):
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if revision_id not in self._cached_trees:
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branch = self.this_branch
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tree = self.this_tree.revision_tree(revision_id)
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except errors.NoSuchRevisionInTree:
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tree = branch.repository.revision_tree(revision_id)
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self._cached_trees[revision_id] = tree
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return self._cached_trees[revision_id]
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def _get_tree(self, treespec, possible_transports=None):
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from bzrlib import workingtree
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location, revno = treespec
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tree = workingtree.WorkingTree.open_containing(location)[0]
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return tree.branch, tree
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branch = _mod_branch.Branch.open_containing(
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location, possible_transports)[0]
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revision_id = branch.last_revision()
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revision_id = branch.get_rev_id(revno)
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revision_id = _mod_revision.ensure_null(revision_id)
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return branch, self.revision_tree(revision_id, branch)
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@deprecated_method(deprecated_in((2, 1, 0)))
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def ensure_revision_trees(self):
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if self.this_revision_tree is None:
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self.this_basis_tree = self.revision_tree(self.this_basis)
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if self.this_basis == self.this_rev_id:
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self.this_revision_tree = self.this_basis_tree
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if self.other_rev_id is None:
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other_basis_tree = self.revision_tree(self.other_basis)
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if other_basis_tree.has_changes(self.other_tree):
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raise errors.WorkingTreeNotRevision(self.this_tree)
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other_rev_id = self.other_basis
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self.other_tree = other_basis_tree
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@deprecated_method(deprecated_in((2, 1, 0)))
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def file_revisions(self, file_id):
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self.ensure_revision_trees()
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def get_id(tree, file_id):
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revision_id = tree.inventory[file_id].revision
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if self.this_rev_id is None:
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if self.this_basis_tree.get_file_sha1(file_id) != \
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self.this_tree.get_file_sha1(file_id):
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raise errors.WorkingTreeNotRevision(self.this_tree)
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trees = (self.this_basis_tree, self.other_tree)
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return [get_id(tree, file_id) for tree in trees]
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@deprecated_method(deprecated_in((2, 1, 0)))
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def check_basis(self, check_clean, require_commits=True):
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if self.this_basis is None and require_commits is True:
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raise errors.BzrCommandError(
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"This branch has no commits."
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" (perhaps you would prefer 'bzr pull')")
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if self.this_basis != self.this_rev_id:
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raise errors.UncommittedChanges(self.this_tree)
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@deprecated_method(deprecated_in((2, 1, 0)))
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def compare_basis(self):
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basis_tree = self.revision_tree(self.this_tree.last_revision())
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except errors.NoSuchRevision:
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basis_tree = self.this_tree.basis_tree()
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if not self.this_tree.has_changes(basis_tree):
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self.this_rev_id = self.this_basis
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def set_interesting_files(self, file_list):
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self.interesting_files = file_list
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def set_pending(self):
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if (not self.base_is_ancestor or not self.base_is_other_ancestor
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or self.other_rev_id is None):
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def _add_parent(self):
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new_parents = self.this_tree.get_parent_ids() + [self.other_rev_id]
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new_parent_trees = []
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operation = OperationWithCleanups(self.this_tree.set_parent_trees)
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for revision_id in new_parents:
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tree = self.revision_tree(revision_id)
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except errors.NoSuchRevision:
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operation.add_cleanup(tree.unlock)
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new_parent_trees.append((revision_id, tree))
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operation.run_simple(new_parent_trees, allow_leftmost_as_ghost=True)
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def set_other(self, other_revision, possible_transports=None):
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"""Set the revision and tree to merge from.
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This sets the other_tree, other_rev_id, other_basis attributes.
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:param other_revision: The [path, revision] list to merge from.
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self.other_branch, self.other_tree = self._get_tree(other_revision,
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if other_revision[1] == -1:
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self.other_rev_id = _mod_revision.ensure_null(
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self.other_branch.last_revision())
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if _mod_revision.is_null(self.other_rev_id):
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raise errors.NoCommits(self.other_branch)
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self.other_basis = self.other_rev_id
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elif other_revision[1] is not None:
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self.other_rev_id = self.other_branch.get_rev_id(other_revision[1])
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self.other_basis = self.other_rev_id
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self.other_rev_id = None
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self.other_basis = self.other_branch.last_revision()
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if self.other_basis is None:
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raise errors.NoCommits(self.other_branch)
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if self.other_rev_id is not None:
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self._cached_trees[self.other_rev_id] = self.other_tree
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self._maybe_fetch(self.other_branch,self.this_branch, self.other_basis)
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def set_other_revision(self, revision_id, other_branch):
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"""Set 'other' based on a branch and revision id
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:param revision_id: The revision to use for a tree
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:param other_branch: The branch containing this tree
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self.other_rev_id = revision_id
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self.other_branch = other_branch
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self._maybe_fetch(other_branch, self.this_branch, self.other_rev_id)
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self.other_tree = self.revision_tree(revision_id)
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self.other_basis = revision_id
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def set_base_revision(self, revision_id, branch):
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"""Set 'base' based on a branch and revision id
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:param revision_id: The revision to use for a tree
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:param branch: The branch containing this tree
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self.base_rev_id = revision_id
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self.base_branch = branch
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self._maybe_fetch(branch, self.this_branch, revision_id)
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self.base_tree = self.revision_tree(revision_id)
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def _maybe_fetch(self, source, target, revision_id):
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if not source.repository.has_same_location(target.repository):
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target.fetch(source, revision_id)
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revisions = [_mod_revision.ensure_null(self.this_basis),
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_mod_revision.ensure_null(self.other_basis)]
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if _mod_revision.NULL_REVISION in revisions:
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self.base_rev_id = _mod_revision.NULL_REVISION
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self.base_tree = self.revision_tree(self.base_rev_id)
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self._is_criss_cross = False
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lcas = self.revision_graph.find_lca(revisions[0], revisions[1])
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self._is_criss_cross = False
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self.base_rev_id = _mod_revision.NULL_REVISION
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self.base_rev_id = list(lcas)[0]
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else: # len(lcas) > 1
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# find_unique_lca can only handle 2 nodes, so we have to
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# start back at the beginning. It is a shame to traverse
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# the graph again, but better than re-implementing
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self.base_rev_id = self.revision_graph.find_unique_lca(
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revisions[0], revisions[1])
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self.base_rev_id = self.revision_graph.find_unique_lca(
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self._is_criss_cross = True
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if self.base_rev_id == _mod_revision.NULL_REVISION:
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raise errors.UnrelatedBranches()
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if self._is_criss_cross:
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trace.warning('Warning: criss-cross merge encountered. See bzr'
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' help criss-cross.')
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trace.mutter('Criss-cross lcas: %r' % lcas)
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interesting_revision_ids = [self.base_rev_id]
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interesting_revision_ids.extend(lcas)
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interesting_trees = dict((t.get_revision_id(), t)
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for t in self.this_branch.repository.revision_trees(
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interesting_revision_ids))
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self._cached_trees.update(interesting_trees)
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self.base_tree = interesting_trees.pop(self.base_rev_id)
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sorted_lca_keys = self.revision_graph.find_merge_order(
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self._lca_trees = [interesting_trees[key]
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for key in sorted_lca_keys]
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self.base_tree = self.revision_tree(self.base_rev_id)
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self.base_is_ancestor = True
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self.base_is_other_ancestor = True
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trace.mutter('Base revid: %r' % self.base_rev_id)
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def set_base(self, base_revision):
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"""Set the base revision to use for the merge.
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:param base_revision: A 2-list containing a path and revision number.
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trace.mutter("doing merge() with no base_revision specified")
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if base_revision == [None, None]:
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base_branch, self.base_tree = self._get_tree(base_revision)
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if base_revision[1] == -1:
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self.base_rev_id = base_branch.last_revision()
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elif base_revision[1] is None:
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self.base_rev_id = _mod_revision.NULL_REVISION
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self.base_rev_id = _mod_revision.ensure_null(
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base_branch.get_rev_id(base_revision[1]))
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self._maybe_fetch(base_branch, self.this_branch, self.base_rev_id)
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def make_merger(self):
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kwargs = {'working_tree':self.this_tree, 'this_tree': self.this_tree,
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'other_tree': self.other_tree,
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'interesting_ids': self.interesting_ids,
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'interesting_files': self.interesting_files,
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'this_branch': self.this_branch,
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if self.merge_type.requires_base:
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kwargs['base_tree'] = self.base_tree
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if self.merge_type.supports_reprocess:
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kwargs['reprocess'] = self.reprocess
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raise errors.BzrError(
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"Conflict reduction is not supported for merge"
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" type %s." % self.merge_type)
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if self.merge_type.supports_show_base:
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kwargs['show_base'] = self.show_base
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raise errors.BzrError("Showing base is not supported for this"
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" merge type. %s" % self.merge_type)
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if (not getattr(self.merge_type, 'supports_reverse_cherrypick', True)
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and not self.base_is_other_ancestor):
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raise errors.CannotReverseCherrypick()
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if self.merge_type.supports_cherrypick:
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kwargs['cherrypick'] = (not self.base_is_ancestor or
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not self.base_is_other_ancestor)
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if self._is_criss_cross and getattr(self.merge_type,
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'supports_lca_trees', False):
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kwargs['lca_trees'] = self._lca_trees
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return self.merge_type(pb=None,
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change_reporter=self.change_reporter,
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def _do_merge_to(self):
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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():
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sub_tree = self.this_tree.get_nested_tree(file_id, relpath)
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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
@deprecated_method(deprecated_in((2, 2, 0)))
1177
def scalar_three_way(this_tree, base_tree, other_tree, file_id, key):
1178
"""Do a three-way test on a scalar.
1179
Return "this", "other" or "conflict", depending whether a value wins.
1181
key_base = key(base_tree, file_id)
1182
key_other = key(other_tree, file_id)
1183
#if base == other, either they all agree, or only THIS has changed.
1184
if key_base == key_other:
1186
key_this = key(this_tree, file_id)
1187
# "Ambiguous clean merge"
1188
if key_this == key_other:
1190
elif key_this == key_base:
1195
def merge_names(self, file_id):
1196
def get_entry(tree):
1197
if tree.has_id(file_id):
1198
return tree.inventory[file_id]
1201
this_entry = get_entry(self.this_tree)
1202
other_entry = get_entry(self.other_tree)
1203
base_entry = get_entry(self.base_tree)
1204
entries = (base_entry, other_entry, this_entry)
1207
for entry in entries:
1210
parents.append(None)
1212
names.append(entry.name)
1213
parents.append(entry.parent_id)
1214
return self._merge_names(file_id, parents, names,
1215
resolver=self._three_way)
1217
def _merge_names(self, file_id, parents, names, resolver):
1218
"""Perform a merge on file_id names and parents"""
1219
base_name, other_name, this_name = names
1220
base_parent, other_parent, this_parent = parents
1222
name_winner = resolver(*names)
1224
parent_id_winner = resolver(*parents)
1225
if this_name is None:
1226
if name_winner == "this":
1227
name_winner = "other"
1228
if parent_id_winner == "this":
1229
parent_id_winner = "other"
1230
if name_winner == "this" and parent_id_winner == "this":
1232
if name_winner == "conflict":
1233
trans_id = self.tt.trans_id_file_id(file_id)
1234
self._raw_conflicts.append(('name conflict', trans_id,
1235
this_name, other_name))
1236
if parent_id_winner == "conflict":
1237
trans_id = self.tt.trans_id_file_id(file_id)
1238
self._raw_conflicts.append(('parent conflict', trans_id,
1239
this_parent, other_parent))
1240
if other_name is None:
1241
# it doesn't matter whether the result was 'other' or
1242
# 'conflict'-- if there's no 'other', we leave it alone.
1244
# if we get here, name_winner and parent_winner are set to safe values.
1245
trans_id = self.tt.trans_id_file_id(file_id)
1246
parent_id = parents[self.winner_idx[parent_id_winner]]
1247
if parent_id is not None:
1248
parent_trans_id = self.tt.trans_id_file_id(parent_id)
1249
self.tt.adjust_path(names[self.winner_idx[name_winner]],
1250
parent_trans_id, trans_id)
1252
def _do_merge_contents(self, file_id):
1253
"""Performs a merge on file_id contents."""
1254
def contents_pair(tree):
1255
if file_id not in tree:
1257
kind = tree.kind(file_id)
1259
contents = tree.get_file_sha1(file_id)
1260
elif kind == "symlink":
1261
contents = tree.get_symlink_target(file_id)
1264
return kind, contents
1266
# See SPOT run. run, SPOT, run.
1267
# So we're not QUITE repeating ourselves; we do tricky things with
1269
base_pair = contents_pair(self.base_tree)
1270
other_pair = contents_pair(self.other_tree)
1272
this_pair = contents_pair(self.this_tree)
1273
lca_pairs = [contents_pair(tree) for tree in self._lca_trees]
1274
winner = self._lca_multi_way((base_pair, lca_pairs), other_pair,
1275
this_pair, allow_overriding_lca=False)
1277
if base_pair == other_pair:
1280
# We delayed evaluating this_pair as long as we can to avoid
1281
# unnecessary sha1 calculation
1282
this_pair = contents_pair(self.this_tree)
1283
winner = self._three_way(base_pair, other_pair, this_pair)
1284
if winner == 'this':
1285
# No interesting changes introduced by OTHER
1287
# We have a hypothetical conflict, but if we have files, then we
1288
# can try to merge the content
1289
trans_id = self.tt.trans_id_file_id(file_id)
1290
params = MergeHookParams(self, file_id, trans_id, this_pair[0],
1291
other_pair[0], winner)
1292
hooks = self.active_hooks
1293
hook_status = 'not_applicable'
1295
hook_status, lines = hook.merge_contents(params)
1296
if hook_status != 'not_applicable':
1297
# Don't try any more hooks, this one applies.
1300
if hook_status == 'not_applicable':
1301
# This is a contents conflict, because none of the available
1302
# functions could merge it.
1304
name = self.tt.final_name(trans_id)
1305
parent_id = self.tt.final_parent(trans_id)
1306
if self.this_tree.has_id(file_id):
1307
self.tt.unversion_file(trans_id)
1308
file_group = self._dump_conflicts(name, parent_id, file_id,
1310
self._raw_conflicts.append(('contents conflict', file_group))
1311
elif hook_status == 'success':
1312
self.tt.create_file(lines, trans_id)
1313
elif hook_status == 'conflicted':
1314
# XXX: perhaps the hook should be able to provide
1315
# the BASE/THIS/OTHER files?
1316
self.tt.create_file(lines, trans_id)
1317
self._raw_conflicts.append(('text conflict', trans_id))
1318
name = self.tt.final_name(trans_id)
1319
parent_id = self.tt.final_parent(trans_id)
1320
self._dump_conflicts(name, parent_id, file_id)
1321
elif hook_status == 'delete':
1322
self.tt.unversion_file(trans_id)
1324
elif hook_status == 'done':
1325
# The hook function did whatever it needs to do directly, no
1326
# further action needed here.
1329
raise AssertionError('unknown hook_status: %r' % (hook_status,))
1330
if not self.this_tree.has_id(file_id) and result == "modified":
1331
self.tt.version_file(file_id, trans_id)
1332
# The merge has been performed, so the old contents should not be
1335
self.tt.delete_contents(trans_id)
1336
except errors.NoSuchFile:
1340
def _default_other_winner_merge(self, merge_hook_params):
1341
"""Replace this contents with other."""
1342
file_id = merge_hook_params.file_id
1343
trans_id = merge_hook_params.trans_id
1344
file_in_this = self.this_tree.has_id(file_id)
1345
if self.other_tree.has_id(file_id):
1346
# OTHER changed the file
1348
if wt.supports_content_filtering():
1349
# We get the path from the working tree if it exists.
1350
# That fails though when OTHER is adding a file, so
1351
# we fall back to the other tree to find the path if
1352
# it doesn't exist locally.
1354
filter_tree_path = wt.id2path(file_id)
1355
except errors.NoSuchId:
1356
filter_tree_path = self.other_tree.id2path(file_id)
1358
# Skip the id2path lookup for older formats
1359
filter_tree_path = None
1360
transform.create_from_tree(self.tt, trans_id,
1361
self.other_tree, file_id,
1362
filter_tree_path=filter_tree_path)
1365
# OTHER deleted the file
1366
return 'delete', None
1368
raise AssertionError(
1369
'winner is OTHER, but file_id %r not in THIS or OTHER tree'
1372
def merge_contents(self, merge_hook_params):
1373
"""Fallback merge logic after user installed hooks."""
1374
# This function is used in merge hooks as the fallback instance.
1375
# Perhaps making this function and the functions it calls be a
1376
# a separate class would be better.
1377
if merge_hook_params.winner == 'other':
1378
# OTHER is a straight winner, so replace this contents with other
1379
return self._default_other_winner_merge(merge_hook_params)
1380
elif merge_hook_params.is_file_merge():
1381
# THIS and OTHER are both files, so text merge. Either
1382
# BASE is a file, or both converted to files, so at least we
1383
# have agreement that output should be a file.
1385
self.text_merge(merge_hook_params.file_id,
1386
merge_hook_params.trans_id)
1387
except errors.BinaryFile:
1388
return 'not_applicable', None
1391
return 'not_applicable', None
1393
def get_lines(self, tree, file_id):
1394
"""Return the lines in a file, or an empty list."""
1395
if tree.has_id(file_id):
1396
return tree.get_file(file_id).readlines()
1400
def text_merge(self, file_id, trans_id):
1401
"""Perform a three-way text merge on a file_id"""
1402
# it's possible that we got here with base as a different type.
1403
# if so, we just want two-way text conflicts.
1404
if self.base_tree.has_id(file_id) and \
1405
self.base_tree.kind(file_id) == "file":
1406
base_lines = self.get_lines(self.base_tree, file_id)
1409
other_lines = self.get_lines(self.other_tree, file_id)
1410
this_lines = self.get_lines(self.this_tree, file_id)
1411
m3 = merge3.Merge3(base_lines, this_lines, other_lines,
1412
is_cherrypick=self.cherrypick)
1413
start_marker = "!START OF MERGE CONFLICT!" + "I HOPE THIS IS UNIQUE"
1414
if self.show_base is True:
1415
base_marker = '|' * 7
1419
def iter_merge3(retval):
1420
retval["text_conflicts"] = False
1421
for line in m3.merge_lines(name_a = "TREE",
1422
name_b = "MERGE-SOURCE",
1423
name_base = "BASE-REVISION",
1424
start_marker=start_marker,
1425
base_marker=base_marker,
1426
reprocess=self.reprocess):
1427
if line.startswith(start_marker):
1428
retval["text_conflicts"] = True
1429
yield line.replace(start_marker, '<' * 7)
1433
merge3_iterator = iter_merge3(retval)
1434
self.tt.create_file(merge3_iterator, trans_id)
1435
if retval["text_conflicts"] is True:
1436
self._raw_conflicts.append(('text conflict', trans_id))
1437
name = self.tt.final_name(trans_id)
1438
parent_id = self.tt.final_parent(trans_id)
1439
file_group = self._dump_conflicts(name, parent_id, file_id,
1440
this_lines, base_lines,
1442
file_group.append(trans_id)
1444
def _dump_conflicts(self, name, parent_id, file_id, this_lines=None,
1445
base_lines=None, other_lines=None, set_version=False,
1447
"""Emit conflict files.
1448
If this_lines, base_lines, or other_lines are omitted, they will be
1449
determined automatically. If set_version is true, the .OTHER, .THIS
1450
or .BASE (in that order) will be created as versioned files.
1452
data = [('OTHER', self.other_tree, other_lines),
1453
('THIS', self.this_tree, this_lines)]
1455
data.append(('BASE', self.base_tree, base_lines))
1457
# We need to use the actual path in the working tree of the file here,
1458
# ignoring the conflict suffixes
1460
if wt.supports_content_filtering():
1462
filter_tree_path = wt.id2path(file_id)
1463
except errors.NoSuchId:
1464
# file has been deleted
1465
filter_tree_path = None
1467
# Skip the id2path lookup for older formats
1468
filter_tree_path = None
1472
for suffix, tree, lines in data:
1473
if tree.has_id(file_id):
1474
trans_id = self._conflict_file(name, parent_id, tree, file_id,
1475
suffix, lines, filter_tree_path)
1476
file_group.append(trans_id)
1477
if set_version and not versioned:
1478
self.tt.version_file(file_id, trans_id)
1482
def _conflict_file(self, name, parent_id, tree, file_id, suffix,
1483
lines=None, filter_tree_path=None):
1484
"""Emit a single conflict file."""
1485
name = name + '.' + suffix
1486
trans_id = self.tt.create_path(name, parent_id)
1487
transform.create_from_tree(self.tt, trans_id, tree, file_id, lines,
1491
def merge_executable(self, file_id, file_status):
1492
"""Perform a merge on the execute bit."""
1493
executable = [self.executable(t, file_id) for t in (self.base_tree,
1494
self.other_tree, self.this_tree)]
1495
self._merge_executable(file_id, executable, file_status,
1496
resolver=self._three_way)
1498
def _merge_executable(self, file_id, executable, file_status,
1500
"""Perform a merge on the execute bit."""
1501
base_executable, other_executable, this_executable = executable
1502
if file_status == "deleted":
1504
winner = resolver(*executable)
1505
if winner == "conflict":
1506
# There must be a None in here, if we have a conflict, but we
1507
# need executability since file status was not deleted.
1508
if self.executable(self.other_tree, file_id) is None:
1512
if winner == 'this' and file_status != "modified":
1514
trans_id = self.tt.trans_id_file_id(file_id)
1516
if self.tt.final_kind(trans_id) != "file":
1518
except errors.NoSuchFile:
1520
if winner == "this":
1521
executability = this_executable
1523
if self.other_tree.has_id(file_id):
1524
executability = other_executable
1525
elif self.this_tree.has_id(file_id):
1526
executability = this_executable
1527
elif self.base_tree_has_id(file_id):
1528
executability = base_executable
1529
if executability is not None:
1530
trans_id = self.tt.trans_id_file_id(file_id)
1531
self.tt.set_executability(executability, trans_id)
1533
def cook_conflicts(self, fs_conflicts):
1534
"""Convert all conflicts into a form that doesn't depend on trans_id"""
1536
self.cooked_conflicts.extend(transform.cook_conflicts(
1537
fs_conflicts, self.tt))
1538
fp = transform.FinalPaths(self.tt)
1539
for conflict in self._raw_conflicts:
1540
conflict_type = conflict[0]
1541
if conflict_type in ('name conflict', 'parent conflict'):
1542
trans_id = conflict[1]
1543
conflict_args = conflict[2:]
1544
if trans_id not in name_conflicts:
1545
name_conflicts[trans_id] = {}
1546
transform.unique_add(name_conflicts[trans_id], conflict_type,
1548
if conflict_type == 'contents conflict':
1549
for trans_id in conflict[1]:
1550
file_id = self.tt.final_file_id(trans_id)
1551
if file_id is not None:
1553
path = fp.get_path(trans_id)
1554
for suffix in ('.BASE', '.THIS', '.OTHER'):
1555
if path.endswith(suffix):
1556
path = path[:-len(suffix)]
1558
c = _mod_conflicts.Conflict.factory(conflict_type,
1559
path=path, file_id=file_id)
1560
self.cooked_conflicts.append(c)
1561
if conflict_type == 'text conflict':
1562
trans_id = conflict[1]
1563
path = fp.get_path(trans_id)
1564
file_id = self.tt.final_file_id(trans_id)
1565
c = _mod_conflicts.Conflict.factory(conflict_type,
1566
path=path, file_id=file_id)
1567
self.cooked_conflicts.append(c)
1569
for trans_id, conflicts in name_conflicts.iteritems():
1571
this_parent, other_parent = conflicts['parent conflict']
1572
if this_parent == other_parent:
1573
raise AssertionError()
1575
this_parent = other_parent = \
1576
self.tt.final_file_id(self.tt.final_parent(trans_id))
1578
this_name, other_name = conflicts['name conflict']
1579
if this_name == other_name:
1580
raise AssertionError()
1582
this_name = other_name = self.tt.final_name(trans_id)
1583
other_path = fp.get_path(trans_id)
1584
if this_parent is not None and this_name is not None:
1585
this_parent_path = \
1586
fp.get_path(self.tt.trans_id_file_id(this_parent))
1587
this_path = osutils.pathjoin(this_parent_path, this_name)
1589
this_path = "<deleted>"
1590
file_id = self.tt.final_file_id(trans_id)
1591
c = _mod_conflicts.Conflict.factory('path conflict', path=this_path,
1592
conflict_path=other_path,
1594
self.cooked_conflicts.append(c)
1595
self.cooked_conflicts.sort(key=_mod_conflicts.Conflict.sort_key)
1598
class WeaveMerger(Merge3Merger):
1599
"""Three-way tree merger, text weave merger."""
1600
supports_reprocess = True
1601
supports_show_base = False
1602
supports_reverse_cherrypick = False
1603
history_based = True
1605
def _generate_merge_plan(self, file_id, base):
1606
return self.this_tree.plan_file_merge(file_id, self.other_tree,
1609
def _merged_lines(self, file_id):
1610
"""Generate the merged lines.
1611
There is no distinction between lines that are meant to contain <<<<<<<
1615
base = self.base_tree
1618
plan = self._generate_merge_plan(file_id, base)
1619
if 'merge' in debug.debug_flags:
1621
trans_id = self.tt.trans_id_file_id(file_id)
1622
name = self.tt.final_name(trans_id) + '.plan'
1623
contents = ('%11s|%s' % l for l in plan)
1624
self.tt.new_file(name, self.tt.final_parent(trans_id), contents)
1625
textmerge = versionedfile.PlanWeaveMerge(plan, '<<<<<<< TREE\n',
1626
'>>>>>>> MERGE-SOURCE\n')
1627
lines, conflicts = textmerge.merge_lines(self.reprocess)
1629
base_lines = textmerge.base_from_plan()
1632
return lines, base_lines
1634
def text_merge(self, file_id, trans_id):
1635
"""Perform a (weave) text merge for a given file and file-id.
1636
If conflicts are encountered, .THIS and .OTHER files will be emitted,
1637
and a conflict will be noted.
1639
lines, base_lines = self._merged_lines(file_id)
1641
# Note we're checking whether the OUTPUT is binary in this case,
1642
# because we don't want to get into weave merge guts.
1643
textfile.check_text_lines(lines)
1644
self.tt.create_file(lines, trans_id)
1645
if base_lines is not None:
1647
self._raw_conflicts.append(('text conflict', trans_id))
1648
name = self.tt.final_name(trans_id)
1649
parent_id = self.tt.final_parent(trans_id)
1650
file_group = self._dump_conflicts(name, parent_id, file_id,
1652
base_lines=base_lines)
1653
file_group.append(trans_id)
1656
class LCAMerger(WeaveMerger):
1658
def _generate_merge_plan(self, file_id, base):
1659
return self.this_tree.plan_file_lca_merge(file_id, self.other_tree,
1662
class Diff3Merger(Merge3Merger):
1663
"""Three-way merger using external diff3 for text merging"""
1665
def dump_file(self, temp_dir, name, tree, file_id):
1666
out_path = osutils.pathjoin(temp_dir, name)
1667
out_file = open(out_path, "wb")
1669
in_file = tree.get_file(file_id)
1670
for line in in_file:
1671
out_file.write(line)
1676
def text_merge(self, file_id, trans_id):
1677
"""Perform a diff3 merge using a specified file-id and trans-id.
1678
If conflicts are encountered, .BASE, .THIS. and .OTHER conflict files
1679
will be dumped, and a will be conflict noted.
1682
temp_dir = osutils.mkdtemp(prefix="bzr-")
1684
new_file = osutils.pathjoin(temp_dir, "new")
1685
this = self.dump_file(temp_dir, "this", self.this_tree, file_id)
1686
base = self.dump_file(temp_dir, "base", self.base_tree, file_id)
1687
other = self.dump_file(temp_dir, "other", self.other_tree, file_id)
1688
status = bzrlib.patch.diff3(new_file, this, base, other)
1689
if status not in (0, 1):
1690
raise errors.BzrError("Unhandled diff3 exit code")
1691
f = open(new_file, 'rb')
1693
self.tt.create_file(f, trans_id)
1697
name = self.tt.final_name(trans_id)
1698
parent_id = self.tt.final_parent(trans_id)
1699
self._dump_conflicts(name, parent_id, file_id)
1700
self._raw_conflicts.append(('text conflict', trans_id))
1702
osutils.rmtree(temp_dir)
1705
def merge_inner(this_branch, other_tree, base_tree, ignore_zero=False,
1707
merge_type=Merge3Merger,
1708
interesting_ids=None,
1712
interesting_files=None,
1715
change_reporter=None):
1716
"""Primary interface for merging.
1718
typical use is probably
1719
'merge_inner(branch, branch.get_revision_tree(other_revision),
1720
branch.get_revision_tree(base_revision))'
1722
if this_tree is None:
1723
raise errors.BzrError("bzrlib.merge.merge_inner requires a this_tree "
1724
"parameter as of bzrlib version 0.8.")
1725
merger = Merger(this_branch, other_tree, base_tree, this_tree=this_tree,
1726
pb=pb, change_reporter=change_reporter)
1727
merger.backup_files = backup_files
1728
merger.merge_type = merge_type
1729
merger.interesting_ids = interesting_ids
1730
merger.ignore_zero = ignore_zero
1731
if interesting_files:
1733
raise ValueError('Only supply interesting_ids'
1734
' or interesting_files')
1735
merger.interesting_files = interesting_files
1736
merger.show_base = show_base
1737
merger.reprocess = reprocess
1738
merger.other_rev_id = other_rev_id
1739
merger.other_basis = other_rev_id
1740
get_revision_id = getattr(base_tree, 'get_revision_id', None)
1741
if get_revision_id is None:
1742
get_revision_id = base_tree.last_revision
1743
merger.cache_trees_with_revision_ids([other_tree, base_tree, this_tree])
1744
merger.set_base_revision(get_revision_id(), this_branch)
1745
return merger.do_merge()
1747
def get_merge_type_registry():
1748
"""Merge type registry is in bzrlib.option to avoid circular imports.
1750
This method provides a sanctioned way to retrieve it.
1752
from bzrlib import option
1753
return option._merge_type_registry
1756
def _plan_annotate_merge(annotated_a, annotated_b, ancestors_a, ancestors_b):
1757
def status_a(revision, text):
1758
if revision in ancestors_b:
1759
return 'killed-b', text
1761
return 'new-a', text
1763
def status_b(revision, text):
1764
if revision in ancestors_a:
1765
return 'killed-a', text
1767
return 'new-b', text
1769
plain_a = [t for (a, t) in annotated_a]
1770
plain_b = [t for (a, t) in annotated_b]
1771
matcher = patiencediff.PatienceSequenceMatcher(None, plain_a, plain_b)
1772
blocks = matcher.get_matching_blocks()
1775
for ai, bi, l in blocks:
1776
# process all mismatched sections
1777
# (last mismatched section is handled because blocks always
1778
# includes a 0-length last block)
1779
for revision, text in annotated_a[a_cur:ai]:
1780
yield status_a(revision, text)
1781
for revision, text in annotated_b[b_cur:bi]:
1782
yield status_b(revision, text)
1783
# and now the matched section
1786
for text_a in plain_a[ai:a_cur]:
1787
yield "unchanged", text_a
1790
class _PlanMergeBase(object):
1792
def __init__(self, a_rev, b_rev, vf, key_prefix):
1795
:param a_rev: Revision-id of one revision to merge
1796
:param b_rev: Revision-id of the other revision to merge
1797
:param vf: A VersionedFiles containing both revisions
1798
:param key_prefix: A prefix for accessing keys in vf, typically
1804
self._last_lines = None
1805
self._last_lines_revision_id = None
1806
self._cached_matching_blocks = {}
1807
self._key_prefix = key_prefix
1808
self._precache_tip_lines()
1810
def _precache_tip_lines(self):
1811
lines = self.get_lines([self.a_rev, self.b_rev])
1812
self.lines_a = lines[self.a_rev]
1813
self.lines_b = lines[self.b_rev]
1815
def get_lines(self, revisions):
1816
"""Get lines for revisions from the backing VersionedFiles.
1818
:raises RevisionNotPresent: on absent texts.
1820
keys = [(self._key_prefix + (rev,)) for rev in revisions]
1822
for record in self.vf.get_record_stream(keys, 'unordered', True):
1823
if record.storage_kind == 'absent':
1824
raise errors.RevisionNotPresent(record.key, self.vf)
1825
result[record.key[-1]] = osutils.chunks_to_lines(
1826
record.get_bytes_as('chunked'))
1829
def plan_merge(self):
1830
"""Generate a 'plan' for merging the two revisions.
1832
This involves comparing their texts and determining the cause of
1833
differences. If text A has a line and text B does not, then either the
1834
line was added to text A, or it was deleted from B. Once the causes
1835
are combined, they are written out in the format described in
1836
VersionedFile.plan_merge
1838
blocks = self._get_matching_blocks(self.a_rev, self.b_rev)
1839
unique_a, unique_b = self._unique_lines(blocks)
1840
new_a, killed_b = self._determine_status(self.a_rev, unique_a)
1841
new_b, killed_a = self._determine_status(self.b_rev, unique_b)
1842
return self._iter_plan(blocks, new_a, killed_b, new_b, killed_a)
1844
def _iter_plan(self, blocks, new_a, killed_b, new_b, killed_a):
1847
for i, j, n in blocks:
1848
for a_index in range(last_i, i):
1849
if a_index in new_a:
1850
if a_index in killed_b:
1851
yield 'conflicted-a', self.lines_a[a_index]
1853
yield 'new-a', self.lines_a[a_index]
1855
yield 'killed-b', self.lines_a[a_index]
1856
for b_index in range(last_j, j):
1857
if b_index in new_b:
1858
if b_index in killed_a:
1859
yield 'conflicted-b', self.lines_b[b_index]
1861
yield 'new-b', self.lines_b[b_index]
1863
yield 'killed-a', self.lines_b[b_index]
1864
# handle common lines
1865
for a_index in range(i, i+n):
1866
yield 'unchanged', self.lines_a[a_index]
1870
def _get_matching_blocks(self, left_revision, right_revision):
1871
"""Return a description of which sections of two revisions match.
1873
See SequenceMatcher.get_matching_blocks
1875
cached = self._cached_matching_blocks.get((left_revision,
1877
if cached is not None:
1879
if self._last_lines_revision_id == left_revision:
1880
left_lines = self._last_lines
1881
right_lines = self.get_lines([right_revision])[right_revision]
1883
lines = self.get_lines([left_revision, right_revision])
1884
left_lines = lines[left_revision]
1885
right_lines = lines[right_revision]
1886
self._last_lines = right_lines
1887
self._last_lines_revision_id = right_revision
1888
matcher = patiencediff.PatienceSequenceMatcher(None, left_lines,
1890
return matcher.get_matching_blocks()
1892
def _unique_lines(self, matching_blocks):
1893
"""Analyse matching_blocks to determine which lines are unique
1895
:return: a tuple of (unique_left, unique_right), where the values are
1896
sets of line numbers of unique lines.
1902
for i, j, n in matching_blocks:
1903
unique_left.extend(range(last_i, i))
1904
unique_right.extend(range(last_j, j))
1907
return unique_left, unique_right
1910
def _subtract_plans(old_plan, new_plan):
1911
"""Remove changes from new_plan that came from old_plan.
1913
It is assumed that the difference between the old_plan and new_plan
1914
is their choice of 'b' text.
1916
All lines from new_plan that differ from old_plan are emitted
1917
verbatim. All lines from new_plan that match old_plan but are
1918
not about the 'b' revision are emitted verbatim.
1920
Lines that match and are about the 'b' revision are the lines we
1921
don't want, so we convert 'killed-b' -> 'unchanged', and 'new-b'
1922
is skipped entirely.
1924
matcher = patiencediff.PatienceSequenceMatcher(None, old_plan,
1927
for i, j, n in matcher.get_matching_blocks():
1928
for jj in range(last_j, j):
1930
for jj in range(j, j+n):
1931
plan_line = new_plan[jj]
1932
if plan_line[0] == 'new-b':
1934
elif plan_line[0] == 'killed-b':
1935
yield 'unchanged', plan_line[1]
1941
class _PlanMerge(_PlanMergeBase):
1942
"""Plan an annotate merge using on-the-fly annotation"""
1944
def __init__(self, a_rev, b_rev, vf, key_prefix):
1945
super(_PlanMerge, self).__init__(a_rev, b_rev, vf, key_prefix)
1946
self.a_key = self._key_prefix + (self.a_rev,)
1947
self.b_key = self._key_prefix + (self.b_rev,)
1948
self.graph = _mod_graph.Graph(self.vf)
1949
heads = self.graph.heads((self.a_key, self.b_key))
1951
# one side dominates, so we can just return its values, yay for
1953
# Ideally we would know that before we get this far
1954
self._head_key = heads.pop()
1955
if self._head_key == self.a_key:
1959
trace.mutter('found dominating revision for %s\n%s > %s', self.vf,
1960
self._head_key[-1], other)
1963
self._head_key = None
1966
def _precache_tip_lines(self):
1967
# Turn this into a no-op, because we will do this later
1970
def _find_recursive_lcas(self):
1971
"""Find all the ancestors back to a unique lca"""
1972
cur_ancestors = (self.a_key, self.b_key)
1973
# graph.find_lca(uncommon, keys) now returns plain NULL_REVISION,
1974
# rather than a key tuple. We will just map that directly to no common
1978
next_lcas = self.graph.find_lca(*cur_ancestors)
1979
# Map a plain NULL_REVISION to a simple no-ancestors
1980
if next_lcas == set([_mod_revision.NULL_REVISION]):
1982
# Order the lca's based on when they were merged into the tip
1983
# While the actual merge portion of weave merge uses a set() of
1984
# active revisions, the order of insertion *does* effect the
1985
# implicit ordering of the texts.
1986
for rev_key in cur_ancestors:
1987
ordered_parents = tuple(self.graph.find_merge_order(rev_key,
1989
parent_map[rev_key] = ordered_parents
1990
if len(next_lcas) == 0:
1992
elif len(next_lcas) == 1:
1993
parent_map[list(next_lcas)[0]] = ()
1995
elif len(next_lcas) > 2:
1996
# More than 2 lca's, fall back to grabbing all nodes between
1997
# this and the unique lca.
1998
trace.mutter('More than 2 LCAs, falling back to all nodes for:'
2000
self.a_key, self.b_key, cur_ancestors)
2001
cur_lcas = next_lcas
2002
while len(cur_lcas) > 1:
2003
cur_lcas = self.graph.find_lca(*cur_lcas)
2004
if len(cur_lcas) == 0:
2005
# No common base to find, use the full ancestry
2008
unique_lca = list(cur_lcas)[0]
2009
if unique_lca == _mod_revision.NULL_REVISION:
2010
# find_lca will return a plain 'NULL_REVISION' rather
2011
# than a key tuple when there is no common ancestor, we
2012
# prefer to just use None, because it doesn't confuse
2013
# _get_interesting_texts()
2015
parent_map.update(self._find_unique_parents(next_lcas,
2018
cur_ancestors = next_lcas
2021
def _find_unique_parents(self, tip_keys, base_key):
2022
"""Find ancestors of tip that aren't ancestors of base.
2024
:param tip_keys: Nodes that are interesting
2025
:param base_key: Cull all ancestors of this node
2026
:return: The parent map for all revisions between tip_keys and
2027
base_key. base_key will be included. References to nodes outside of
2028
the ancestor set will also be removed.
2030
# TODO: this would be simpler if find_unique_ancestors took a list
2031
# instead of a single tip, internally it supports it, but it
2032
# isn't a "backwards compatible" api change.
2033
if base_key is None:
2034
parent_map = dict(self.graph.iter_ancestry(tip_keys))
2035
# We remove NULL_REVISION because it isn't a proper tuple key, and
2036
# thus confuses things like _get_interesting_texts, and our logic
2037
# to add the texts into the memory weave.
2038
if _mod_revision.NULL_REVISION in parent_map:
2039
parent_map.pop(_mod_revision.NULL_REVISION)
2042
for tip in tip_keys:
2044
self.graph.find_unique_ancestors(tip, [base_key]))
2045
parent_map = self.graph.get_parent_map(interesting)
2046
parent_map[base_key] = ()
2047
culled_parent_map, child_map, tails = self._remove_external_references(
2049
# Remove all the tails but base_key
2050
if base_key is not None:
2051
tails.remove(base_key)
2052
self._prune_tails(culled_parent_map, child_map, tails)
2053
# Now remove all the uninteresting 'linear' regions
2054
simple_map = _mod_graph.collapse_linear_regions(culled_parent_map)
2058
def _remove_external_references(parent_map):
2059
"""Remove references that go outside of the parent map.
2061
:param parent_map: Something returned from Graph.get_parent_map(keys)
2062
:return: (filtered_parent_map, child_map, tails)
2063
filtered_parent_map is parent_map without external references
2064
child_map is the {parent_key: [child_keys]} mapping
2065
tails is a list of nodes that do not have any parents in the map
2067
# TODO: The basic effect of this function seems more generic than
2068
# _PlanMerge. But the specific details of building a child_map,
2069
# and computing tails seems very specific to _PlanMerge.
2070
# Still, should this be in Graph land?
2071
filtered_parent_map = {}
2074
for key, parent_keys in parent_map.iteritems():
2075
culled_parent_keys = [p for p in parent_keys if p in parent_map]
2076
if not culled_parent_keys:
2078
for parent_key in culled_parent_keys:
2079
child_map.setdefault(parent_key, []).append(key)
2080
# TODO: Do we want to do this, it adds overhead for every node,
2081
# just to say that the node has no children
2082
child_map.setdefault(key, [])
2083
filtered_parent_map[key] = culled_parent_keys
2084
return filtered_parent_map, child_map, tails
2087
def _prune_tails(parent_map, child_map, tails_to_remove):
2088
"""Remove tails from the parent map.
2090
This will remove the supplied revisions until no more children have 0
2093
:param parent_map: A dict of {child: [parents]}, this dictionary will
2094
be modified in place.
2095
:param tails_to_remove: A list of tips that should be removed,
2096
this list will be consumed
2097
:param child_map: The reverse dict of parent_map ({parent: [children]})
2098
this dict will be modified
2099
:return: None, parent_map will be modified in place.
2101
while tails_to_remove:
2102
next = tails_to_remove.pop()
2103
parent_map.pop(next)
2104
children = child_map.pop(next)
2105
for child in children:
2106
child_parents = parent_map[child]
2107
child_parents.remove(next)
2108
if len(child_parents) == 0:
2109
tails_to_remove.append(child)
2111
def _get_interesting_texts(self, parent_map):
2112
"""Return a dict of texts we are interested in.
2114
Note that the input is in key tuples, but the output is in plain
2117
:param parent_map: The output from _find_recursive_lcas
2118
:return: A dict of {'revision_id':lines} as returned by
2119
_PlanMergeBase.get_lines()
2121
all_revision_keys = set(parent_map)
2122
all_revision_keys.add(self.a_key)
2123
all_revision_keys.add(self.b_key)
2125
# Everything else is in 'keys' but get_lines is in 'revision_ids'
2126
all_texts = self.get_lines([k[-1] for k in all_revision_keys])
2129
def _build_weave(self):
2130
from bzrlib import weave
2131
self._weave = weave.Weave(weave_name='in_memory_weave',
2132
allow_reserved=True)
2133
parent_map = self._find_recursive_lcas()
2135
all_texts = self._get_interesting_texts(parent_map)
2137
# Note: Unfortunately, the order given by topo_sort will effect the
2138
# ordering resolution in the output. Specifically, if you add A then B,
2139
# then in the output text A lines will show up before B lines. And, of
2140
# course, topo_sort doesn't guarantee any real ordering.
2141
# So we use merge_sort, and add a fake node on the tip.
2142
# This ensures that left-hand parents will always be inserted into the
2143
# weave before right-hand parents.
2144
tip_key = self._key_prefix + (_mod_revision.CURRENT_REVISION,)
2145
parent_map[tip_key] = (self.a_key, self.b_key)
2147
for seq_num, key, depth, eom in reversed(tsort.merge_sort(parent_map,
2151
# for key in tsort.topo_sort(parent_map):
2152
parent_keys = parent_map[key]
2153
revision_id = key[-1]
2154
parent_ids = [k[-1] for k in parent_keys]
2155
self._weave.add_lines(revision_id, parent_ids,
2156
all_texts[revision_id])
2158
def plan_merge(self):
2159
"""Generate a 'plan' for merging the two revisions.
2161
This involves comparing their texts and determining the cause of
2162
differences. If text A has a line and text B does not, then either the
2163
line was added to text A, or it was deleted from B. Once the causes
2164
are combined, they are written out in the format described in
2165
VersionedFile.plan_merge
2167
if self._head_key is not None: # There was a single head
2168
if self._head_key == self.a_key:
2171
if self._head_key != self.b_key:
2172
raise AssertionError('There was an invalid head: %s != %s'
2173
% (self.b_key, self._head_key))
2175
head_rev = self._head_key[-1]
2176
lines = self.get_lines([head_rev])[head_rev]
2177
return ((plan, line) for line in lines)
2178
return self._weave.plan_merge(self.a_rev, self.b_rev)
2181
class _PlanLCAMerge(_PlanMergeBase):
2183
This merge algorithm differs from _PlanMerge in that:
2184
1. comparisons are done against LCAs only
2185
2. cases where a contested line is new versus one LCA but old versus
2186
another are marked as conflicts, by emitting the line as conflicted-a
2189
This is faster, and hopefully produces more useful output.
2192
def __init__(self, a_rev, b_rev, vf, key_prefix, graph):
2193
_PlanMergeBase.__init__(self, a_rev, b_rev, vf, key_prefix)
2194
lcas = graph.find_lca(key_prefix + (a_rev,), key_prefix + (b_rev,))
2197
if lca == _mod_revision.NULL_REVISION:
2200
self.lcas.add(lca[-1])
2201
for lca in self.lcas:
2202
if _mod_revision.is_null(lca):
2205
lca_lines = self.get_lines([lca])[lca]
2206
matcher = patiencediff.PatienceSequenceMatcher(None, self.lines_a,
2208
blocks = list(matcher.get_matching_blocks())
2209
self._cached_matching_blocks[(a_rev, lca)] = blocks
2210
matcher = patiencediff.PatienceSequenceMatcher(None, self.lines_b,
2212
blocks = list(matcher.get_matching_blocks())
2213
self._cached_matching_blocks[(b_rev, lca)] = blocks
2215
def _determine_status(self, revision_id, unique_line_numbers):
2216
"""Determines the status unique lines versus all lcas.
2218
Basically, determines why the line is unique to this revision.
2220
A line may be determined new, killed, or both.
2222
If a line is determined new, that means it was not present in at least
2223
one LCA, and is not present in the other merge revision.
2225
If a line is determined killed, that means the line was present in
2228
If a line is killed and new, this indicates that the two merge
2229
revisions contain differing conflict resolutions.
2230
:param revision_id: The id of the revision in which the lines are
2232
:param unique_line_numbers: The line numbers of unique lines.
2233
:return a tuple of (new_this, killed_other):
2237
unique_line_numbers = set(unique_line_numbers)
2238
for lca in self.lcas:
2239
blocks = self._get_matching_blocks(revision_id, lca)
2240
unique_vs_lca, _ignored = self._unique_lines(blocks)
2241
new.update(unique_line_numbers.intersection(unique_vs_lca))
2242
killed.update(unique_line_numbers.difference(unique_vs_lca))
added
removed
bzrlib/merge.py
