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# Copyright (C) 2005-2010 Canonical Ltd
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# Copyright (C) 2005, 2006 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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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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from tempfile import mkdtemp
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from bzrlib.branch import Branch
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from bzrlib.conflicts import ConflictList, Conflict
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from bzrlib.delta import compare_trees
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from bzrlib.errors import (BzrCommandError,
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WorkingTreeNotRevision,
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from bzrlib.merge3 import Merge3
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from bzrlib.osutils import rename, pathjoin, rmtree
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from progress import DummyProgress, ProgressPhase
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from bzrlib.revision import common_ancestor, is_ancestor, NULL_REVISION
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from bzrlib.symbol_versioning import *
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from bzrlib.textfile import check_text_lines
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from bzrlib.trace import mutter, warning, note
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from bzrlib.transform import (TreeTransform, resolve_conflicts, cook_conflicts,
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FinalPaths, create_by_entry, unique_add)
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from bzrlib.versionedfile import WeaveMerge
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# TODO: Report back as changes are merged in
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def _get_tree(treespec, local_branch=None):
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location, revno = treespec
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branch = Branch.open_containing(location)[0]
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revision = branch.last_revision()
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revision = branch.get_rev_id(revno)
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revision = NULL_REVISION
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return branch, _get_revid_tree(branch, revision, local_branch)
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def _get_revid_tree(branch, revision, local_branch):
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base_tree = branch.bzrdir.open_workingtree()
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if local_branch is not None:
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if local_branch.base != branch.base:
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local_branch.fetch(branch, revision)
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base_tree = local_branch.repository.revision_tree(revision)
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base_tree = branch.repository.revision_tree(revision)
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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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merge_inner(from_tree.branch, to_tree, from_tree, ignore_zero=True,
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interesting_ids=interesting_ids, this_tree=from_tree)
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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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def __init__(self, this_branch, other_tree=None, base_tree=None,
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this_tree=None, pb=DummyProgress()):
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object.__init__(self)
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assert this_tree is not None, "this_tree is required"
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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_basis = 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 revision_tree(self, revision_id):
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return self.this_branch.repository.revision_tree(revision_id)
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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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self.this_basis_tree = self.this_branch.repository.revision_tree(
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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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changes = compare_trees(self.other_tree, other_basis_tree)
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if changes.has_changed():
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raise WorkingTreeNotRevision(self.this_tree)
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other_rev_id = 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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assert revision_id is not None
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return revision_id
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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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raise 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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def check_basis(self, check_clean):
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if self.this_basis is None:
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raise BzrCommandError("This branch has no commits")
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self.compare_basis()
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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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raise BzrCommandError("Working tree has uncommitted changes.")
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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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changes = compare_trees(self.this_tree,
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self.this_tree.basis_tree(), False)
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if not changes.has_changed():
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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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self._set_interesting_files(file_list)
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except NotVersionedError, e:
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raise BzrCommandError("%s is not a source file in any"
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def _set_interesting_files(self, file_list):
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"""Set the list of interesting ids from a list of files."""
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if file_list is None:
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self.interesting_ids = None
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interesting_ids = set()
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for path in file_list:
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for tree in (self.this_tree, self.base_tree, self.other_tree):
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file_id = tree.inventory.path2id(path)
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if file_id is not None:
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interesting_ids.add(file_id)
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raise NotVersionedError(path=path)
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self.interesting_ids = interesting_ids
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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 not self.base_is_ancestor:
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if self.other_rev_id is None:
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ancestry = self.this_branch.repository.get_ancestry(self.this_basis)
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if self.other_rev_id in ancestry:
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self.this_tree.add_pending_merge(self.other_rev_id)
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def set_other(self, other_revision):
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other_branch, self.other_tree = _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_rev_id = other_branch.last_revision()
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if self.other_rev_id is None:
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raise NoCommits(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_rev_id = 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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self.other_basis = 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:
527
self.base_rev_id = _mod_revision.NULL_REVISION
528
self.base_tree = self.revision_tree(self.base_rev_id)
529
self._is_criss_cross = False
531
lcas = self.revision_graph.find_lca(revisions[0], revisions[1])
532
self._is_criss_cross = False
534
self.base_rev_id = _mod_revision.NULL_REVISION
536
self.base_rev_id = list(lcas)[0]
537
else: # len(lcas) > 1
539
# find_unique_lca can only handle 2 nodes, so we have to
540
# start back at the beginning. It is a shame to traverse
541
# the graph again, but better than re-implementing
543
self.base_rev_id = self.revision_graph.find_unique_lca(
544
revisions[0], revisions[1])
546
self.base_rev_id = self.revision_graph.find_unique_lca(
548
self._is_criss_cross = True
549
if self.base_rev_id == _mod_revision.NULL_REVISION:
550
raise errors.UnrelatedBranches()
551
if self._is_criss_cross:
552
trace.warning('Warning: criss-cross merge encountered. See bzr'
553
' help criss-cross.')
554
trace.mutter('Criss-cross lcas: %r' % lcas)
555
interesting_revision_ids = [self.base_rev_id]
556
interesting_revision_ids.extend(lcas)
557
interesting_trees = dict((t.get_revision_id(), t)
558
for t in self.this_branch.repository.revision_trees(
559
interesting_revision_ids))
560
self._cached_trees.update(interesting_trees)
561
self.base_tree = interesting_trees.pop(self.base_rev_id)
562
sorted_lca_keys = self.revision_graph.find_merge_order(
564
self._lca_trees = [interesting_trees[key]
565
for key in sorted_lca_keys]
567
self.base_tree = self.revision_tree(self.base_rev_id)
568
self.base_is_ancestor = True
569
self.base_is_other_ancestor = True
570
trace.mutter('Base revid: %r' % self.base_rev_id)
204
raise NoCommits(other_branch)
205
if other_branch.base != self.this_branch.base:
206
self.this_branch.fetch(other_branch, last_revision=self.other_basis)
572
208
def set_base(self, base_revision):
573
"""Set the base revision to use for the merge.
575
:param base_revision: A 2-list containing a path and revision number.
577
trace.mutter("doing merge() with no base_revision specified")
209
mutter("doing merge() with no base_revision specified")
578
210
if base_revision == [None, None]:
212
pb = bzrlib.ui.ui_factory.nested_progress_bar()
214
this_repo = self.this_branch.repository
215
self.base_rev_id = common_ancestor(self.this_basis,
220
except NoCommonAncestor:
221
raise UnrelatedBranches()
222
self.base_tree = _get_revid_tree(self.this_branch, self.base_rev_id,
224
self.base_is_ancestor = True
581
base_branch, self.base_tree = self._get_tree(base_revision)
226
base_branch, self.base_tree = _get_tree(base_revision)
582
227
if base_revision[1] == -1:
583
228
self.base_rev_id = base_branch.last_revision()
584
229
elif base_revision[1] is None:
585
self.base_rev_id = _mod_revision.NULL_REVISION
230
self.base_rev_id = None
587
self.base_rev_id = _mod_revision.ensure_null(
588
base_branch.get_rev_id(base_revision[1]))
589
self._maybe_fetch(base_branch, self.this_branch, self.base_rev_id)
232
self.base_rev_id = base_branch.get_rev_id(base_revision[1])
233
if self.this_branch.base != base_branch.base:
234
self.this_branch.fetch(base_branch)
235
self.base_is_ancestor = is_ancestor(self.this_basis,
591
def make_merger(self):
592
kwargs = {'working_tree':self.this_tree, 'this_tree': self.this_tree,
593
'other_tree': self.other_tree,
240
kwargs = {'working_tree':self.this_tree, 'this_tree': self.this_tree,
241
'other_tree': self.other_tree,
594
242
'interesting_ids': self.interesting_ids,
595
'interesting_files': self.interesting_files,
596
'this_branch': self.this_branch,
598
244
if self.merge_type.requires_base:
599
245
kwargs['base_tree'] = self.base_tree
600
246
if self.merge_type.supports_reprocess:
601
247
kwargs['reprocess'] = self.reprocess
602
248
elif self.reprocess:
603
raise errors.BzrError(
604
"Conflict reduction is not supported for merge"
605
" type %s." % self.merge_type)
249
raise BzrError("Conflict reduction is not supported for merge"
250
" type %s." % self.merge_type)
606
251
if self.merge_type.supports_show_base:
607
252
kwargs['show_base'] = self.show_base
608
253
elif self.show_base:
609
raise errors.BzrError("Showing base is not supported for this"
254
raise BzrError("Showing base is not supported for this"
610
255
" merge type. %s" % self.merge_type)
611
if (not getattr(self.merge_type, 'supports_reverse_cherrypick', True)
612
and not self.base_is_other_ancestor):
613
raise errors.CannotReverseCherrypick()
614
if self.merge_type.supports_cherrypick:
615
kwargs['cherrypick'] = (not self.base_is_ancestor or
616
not self.base_is_other_ancestor)
617
if self._is_criss_cross and getattr(self.merge_type,
618
'supports_lca_trees', False):
619
kwargs['lca_trees'] = self._lca_trees
620
return self.merge_type(pb=None,
621
change_reporter=self.change_reporter,
624
def _do_merge_to(self):
625
merge = self.make_merger()
626
if self.other_branch is not None:
627
self.other_branch.update_references(self.this_branch)
629
if self.recurse == 'down':
630
for relpath, file_id in self.this_tree.iter_references():
631
sub_tree = self.this_tree.get_nested_tree(file_id, relpath)
632
other_revision = self.other_tree.get_reference_revision(
634
if other_revision == sub_tree.last_revision():
636
sub_merge = Merger(sub_tree.branch, this_tree=sub_tree)
637
sub_merge.merge_type = self.merge_type
638
other_branch = self.other_branch.reference_parent(file_id, relpath)
639
sub_merge.set_other_revision(other_revision, other_branch)
640
base_revision = self.base_tree.get_reference_revision(file_id)
641
sub_merge.base_tree = \
642
sub_tree.branch.repository.revision_tree(base_revision)
643
sub_merge.base_rev_id = base_revision
648
operation = OperationWithCleanups(self._do_merge_to)
649
self.this_tree.lock_tree_write()
650
operation.add_cleanup(self.this_tree.unlock)
651
if self.base_tree is not None:
652
self.base_tree.lock_read()
653
operation.add_cleanup(self.base_tree.unlock)
654
if self.other_tree is not None:
655
self.other_tree.lock_read()
656
operation.add_cleanup(self.other_tree.unlock)
657
merge = operation.run_simple()
256
merge = self.merge_type(pb=self._pb, **kwargs)
658
257
if len(merge.cooked_conflicts) == 0:
659
if not self.ignore_zero and not trace.is_quiet():
660
trace.note("All changes applied successfully.")
258
if not self.ignore_zero:
259
note("All changes applied successfully.")
662
trace.note("%d conflicts encountered."
663
% len(merge.cooked_conflicts))
261
note("%d conflicts encountered." % len(merge.cooked_conflicts))
665
263
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()
265
def regen_inventory(self, new_entries):
266
old_entries = self.this_tree.read_working_inventory()
270
for path, file_id in new_entries:
273
new_entries_map[file_id] = path
275
def id2path(file_id):
276
path = new_entries_map.get(file_id)
279
entry = old_entries[file_id]
280
if entry.parent_id is None:
282
return pathjoin(id2path(entry.parent_id), entry.name)
284
for file_id in old_entries:
285
entry = old_entries[file_id]
286
path = id2path(file_id)
287
if file_id in self.base_tree.inventory:
288
executable = getattr(self.base_tree.inventory[file_id], 'executable', False)
290
executable = getattr(entry, 'executable', False)
291
new_inventory[file_id] = (path, file_id, entry.parent_id,
292
entry.kind, executable)
294
by_path[path] = file_id
299
for path, file_id in new_entries:
301
del new_inventory[file_id]
304
new_path_list.append((path, file_id))
305
if file_id not in old_entries:
307
# Ensure no file is added before its parent
309
for path, file_id in new_path_list:
313
parent = by_path[os.path.dirname(path)]
314
abspath = pathjoin(self.this_tree.basedir, path)
315
kind = bzrlib.osutils.file_kind(abspath)
316
if file_id in self.base_tree.inventory:
317
executable = getattr(self.base_tree.inventory[file_id], 'executable', False)
320
new_inventory[file_id] = (path, file_id, parent, kind, executable)
321
by_path[path] = file_id
323
# Get a list in insertion order
324
new_inventory_list = new_inventory.values()
325
mutter ("""Inventory regeneration:
326
old length: %i insertions: %i deletions: %i new_length: %i"""\
327
% (len(old_entries), insertions, deletions,
328
len(new_inventory_list)))
329
assert len(new_inventory_list) == len(old_entries) + insertions\
331
new_inventory_list.sort()
332
return new_inventory_list
685
335
class Merge3Merger(object):
688
338
supports_reprocess = True
689
339
supports_show_base = True
690
340
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,
342
def __init__(self, working_tree, this_tree, base_tree, other_tree,
697
343
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.
344
pb=DummyProgress(), pp=None):
345
"""Initialize the merger object and perform the merge."""
727
346
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
347
self.this_tree = working_tree
734
348
self.base_tree = base_tree
735
349
self.other_tree = other_tree
736
self.this_branch = this_branch
737
350
self._raw_conflicts = []
738
351
self.cooked_conflicts = []
739
352
self.reprocess = reprocess
740
353
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)
357
self.pp = ProgressPhase("Merge phase", 3, self.pb)
359
if interesting_ids is not None:
360
all_ids = interesting_ids
362
all_ids = set(base_tree)
363
all_ids.update(other_tree)
364
working_tree.lock_write()
365
self.tt = TreeTransform(working_tree, self.pb)
368
child_pb = bzrlib.ui.ui_factory.nested_progress_bar()
370
for num, file_id in enumerate(all_ids):
371
child_pb.update('Preparing file merge', num, len(all_ids))
372
self.merge_names(file_id)
373
file_status = self.merge_contents(file_id)
374
self.merge_executable(file_id, file_status)
379
child_pb = bzrlib.ui.ui_factory.nested_progress_bar()
381
fs_conflicts = resolve_conflicts(self.tt, child_pb)
384
self.cook_conflicts(fs_conflicts)
385
for conflict in self.cooked_conflicts:
388
results = self.tt.apply()
389
self.write_modified(results)
391
working_tree.set_conflicts(ConflictList(self.cooked_conflicts))
392
except UnsupportedOperation:
399
working_tree.unlock()
1062
402
def write_modified(self, results):
1063
403
modified_hashes = {}
1263
530
return kind, contents
532
def contents_conflict():
533
trans_id = self.tt.trans_id_file_id(file_id)
534
name = self.tt.final_name(trans_id)
535
parent_id = self.tt.final_parent(trans_id)
536
if file_id in self.this_tree.inventory:
537
self.tt.unversion_file(trans_id)
538
self.tt.delete_contents(trans_id)
539
file_group = self._dump_conflicts(name, parent_id, file_id,
541
self._raw_conflicts.append(('contents conflict', file_group))
1265
543
# See SPOT run. run, SPOT, run.
1266
544
# So we're not QUITE repeating ourselves; we do tricky things with
1268
546
base_pair = contents_pair(self.base_tree)
1269
547
other_pair = contents_pair(self.other_tree)
1271
this_pair = contents_pair(self.this_tree)
1272
lca_pairs = [contents_pair(tree) for tree in self._lca_trees]
1273
winner = self._lca_multi_way((base_pair, lca_pairs), other_pair,
1274
this_pair, allow_overriding_lca=False)
1276
if base_pair == other_pair:
1279
# We delayed evaluating this_pair as long as we can to avoid
1280
# unnecessary sha1 calculation
1281
this_pair = contents_pair(self.this_tree)
1282
winner = self._three_way(base_pair, other_pair, this_pair)
1283
if winner == 'this':
1284
# No interesting changes introduced by OTHER
1286
# We have a hypothetical conflict, but if we have files, then we
1287
# can try to merge the content
1288
trans_id = self.tt.trans_id_file_id(file_id)
1289
params = MergeHookParams(self, file_id, trans_id, this_pair[0],
1290
other_pair[0], winner)
1291
hooks = self.active_hooks
1292
hook_status = 'not_applicable'
1294
hook_status, lines = hook.merge_contents(params)
1295
if hook_status != 'not_applicable':
1296
# Don't try any more hooks, this one applies.
1299
if hook_status == 'not_applicable':
1300
# This is a contents conflict, because none of the available
1301
# functions could merge it.
1303
name = self.tt.final_name(trans_id)
1304
parent_id = self.tt.final_parent(trans_id)
1305
if self.this_tree.has_id(file_id):
1306
self.tt.unversion_file(trans_id)
1307
file_group = self._dump_conflicts(name, parent_id, file_id,
1309
self._raw_conflicts.append(('contents conflict', file_group))
1310
elif hook_status == 'success':
1311
self.tt.create_file(lines, trans_id)
1312
elif hook_status == 'conflicted':
1313
# XXX: perhaps the hook should be able to provide
1314
# the BASE/THIS/OTHER files?
1315
self.tt.create_file(lines, trans_id)
1316
self._raw_conflicts.append(('text conflict', trans_id))
1317
name = self.tt.final_name(trans_id)
1318
parent_id = self.tt.final_parent(trans_id)
1319
self._dump_conflicts(name, parent_id, file_id)
1320
elif hook_status == 'delete':
1321
self.tt.unversion_file(trans_id)
1323
elif hook_status == 'done':
1324
# The hook function did whatever it needs to do directly, no
1325
# further action needed here.
1328
raise AssertionError('unknown hook_status: %r' % (hook_status,))
1329
if not self.this_tree.has_id(file_id) and result == "modified":
1330
self.tt.version_file(file_id, trans_id)
1331
# The merge has been performed, so the old contents should not be
1334
self.tt.delete_contents(trans_id)
1335
except errors.NoSuchFile:
1339
def _default_other_winner_merge(self, merge_hook_params):
1340
"""Replace this contents with other."""
1341
file_id = merge_hook_params.file_id
1342
trans_id = merge_hook_params.trans_id
1343
file_in_this = self.this_tree.has_id(file_id)
1344
if self.other_tree.has_id(file_id):
1345
# OTHER changed the file
1347
if wt.supports_content_filtering():
1348
# We get the path from the working tree if it exists.
1349
# That fails though when OTHER is adding a file, so
1350
# we fall back to the other tree to find the path if
1351
# it doesn't exist locally.
1353
filter_tree_path = wt.id2path(file_id)
1354
except errors.NoSuchId:
1355
filter_tree_path = self.other_tree.id2path(file_id)
1357
# Skip the id2path lookup for older formats
1358
filter_tree_path = None
1359
transform.create_from_tree(self.tt, trans_id,
1360
self.other_tree, file_id,
1361
filter_tree_path=filter_tree_path)
1364
# OTHER deleted the file
1365
return 'delete', None
1367
raise AssertionError(
1368
'winner is OTHER, but file_id %r not in THIS or OTHER tree'
1371
def merge_contents(self, merge_hook_params):
1372
"""Fallback merge logic after user installed hooks."""
1373
# This function is used in merge hooks as the fallback instance.
1374
# Perhaps making this function and the functions it calls be a
1375
# a separate class would be better.
1376
if merge_hook_params.winner == 'other':
1377
# OTHER is a straight winner, so replace this contents with other
1378
return self._default_other_winner_merge(merge_hook_params)
1379
elif merge_hook_params.is_file_merge():
1380
# THIS and OTHER are both files, so text merge. Either
1381
# BASE is a file, or both converted to files, so at least we
1382
# have agreement that output should be a file.
1384
self.text_merge(merge_hook_params.file_id,
1385
merge_hook_params.trans_id)
1386
except errors.BinaryFile:
1387
return 'not_applicable', None
1390
return 'not_applicable', None
548
if base_pair == other_pair:
549
# OTHER introduced no changes
551
this_pair = contents_pair(self.this_tree)
552
if this_pair == other_pair:
553
# THIS and OTHER introduced the same changes
556
trans_id = self.tt.trans_id_file_id(file_id)
557
if this_pair == base_pair:
558
# only OTHER introduced changes
559
if file_id in self.this_tree:
560
# Remove any existing contents
561
self.tt.delete_contents(trans_id)
562
if file_id in self.other_tree:
563
# OTHER changed the file
564
create_by_entry(self.tt,
565
self.other_tree.inventory[file_id],
566
self.other_tree, trans_id)
567
if file_id not in self.this_tree.inventory:
568
self.tt.version_file(file_id, trans_id)
570
elif file_id in self.this_tree.inventory:
571
# OTHER deleted the file
572
self.tt.unversion_file(trans_id)
574
#BOTH THIS and OTHER introduced changes; scalar conflict
575
elif this_pair[0] == "file" and other_pair[0] == "file":
576
# THIS and OTHER are both files, so text merge. Either
577
# BASE is a file, or both converted to files, so at least we
578
# have agreement that output should be a file.
580
self.text_merge(file_id, trans_id)
582
return contents_conflict()
583
if file_id not in self.this_tree.inventory:
584
self.tt.version_file(file_id, trans_id)
586
self.tt.tree_kind(trans_id)
587
self.tt.delete_contents(trans_id)
592
# Scalar conflict, can't text merge. Dump conflicts
593
return contents_conflict()
1392
595
def get_lines(self, tree, file_id):
1393
596
"""Return the lines in a file, or an empty list."""
1394
if tree.has_id(file_id):
1395
598
return tree.get_file(file_id).readlines()
1554
738
if path.endswith(suffix):
1555
739
path = path[:-len(suffix)]
1557
c = _mod_conflicts.Conflict.factory(conflict_type,
1558
path=path, file_id=file_id)
741
c = Conflict.factory(conflict_type, path=path, file_id=file_id)
1559
742
self.cooked_conflicts.append(c)
1560
743
if conflict_type == 'text conflict':
1561
744
trans_id = conflict[1]
1562
745
path = fp.get_path(trans_id)
1563
746
file_id = self.tt.final_file_id(trans_id)
1564
c = _mod_conflicts.Conflict.factory(conflict_type,
1565
path=path, file_id=file_id)
747
c = Conflict.factory(conflict_type, path=path, file_id=file_id)
1566
748
self.cooked_conflicts.append(c)
1568
750
for trans_id, conflicts in name_conflicts.iteritems():
1570
752
this_parent, other_parent = conflicts['parent conflict']
1571
if this_parent == other_parent:
1572
raise AssertionError()
753
assert this_parent != other_parent
1573
754
except KeyError:
1574
755
this_parent = other_parent = \
1575
756
self.tt.final_file_id(self.tt.final_parent(trans_id))
1577
758
this_name, other_name = conflicts['name conflict']
1578
if this_name == other_name:
1579
raise AssertionError()
759
assert this_name != other_name
1580
760
except KeyError:
1581
761
this_name = other_name = self.tt.final_name(trans_id)
1582
762
other_path = fp.get_path(trans_id)
1583
if this_parent is not None and this_name is not None:
763
if this_parent is not None:
1584
764
this_parent_path = \
1585
765
fp.get_path(self.tt.trans_id_file_id(this_parent))
1586
this_path = osutils.pathjoin(this_parent_path, this_name)
766
this_path = pathjoin(this_parent_path, this_name)
1588
768
this_path = "<deleted>"
1589
769
file_id = self.tt.final_file_id(trans_id)
1590
c = _mod_conflicts.Conflict.factory('path conflict', path=this_path,
1591
conflict_path=other_path,
770
c = Conflict.factory('path conflict', path=this_path,
771
conflict_path=other_path, file_id=file_id)
1593
772
self.cooked_conflicts.append(c)
1594
self.cooked_conflicts.sort(key=_mod_conflicts.Conflict.sort_key)
773
self.cooked_conflicts.sort(key=Conflict.sort_key)
1597
776
class WeaveMerger(Merge3Merger):
1598
777
"""Three-way tree merger, text weave merger."""
1599
778
supports_reprocess = True
1600
779
supports_show_base = False
1601
supports_reverse_cherrypick = False
1602
history_based = True
1604
def _generate_merge_plan(self, file_id, base):
1605
return self.this_tree.plan_file_merge(file_id, self.other_tree,
781
def __init__(self, working_tree, this_tree, base_tree, other_tree,
782
interesting_ids=None, pb=DummyProgress(), pp=None,
784
self.this_revision_tree = self._get_revision_tree(this_tree)
785
self.other_revision_tree = self._get_revision_tree(other_tree)
786
super(WeaveMerger, self).__init__(working_tree, this_tree,
787
base_tree, other_tree,
788
interesting_ids=interesting_ids,
789
pb=pb, pp=pp, reprocess=reprocess)
791
def _get_revision_tree(self, tree):
792
"""Return a revision tree releated to this tree.
793
If the tree is a WorkingTree, the basis will be returned.
795
if getattr(tree, 'get_weave', False) is False:
796
# If we have a WorkingTree, try using the basis
797
return tree.branch.basis_tree()
801
def _check_file(self, file_id):
802
"""Check that the revision tree's version of the file matches."""
803
for tree, rt in ((self.this_tree, self.this_revision_tree),
804
(self.other_tree, self.other_revision_tree)):
807
if tree.get_file_sha1(file_id) != rt.get_file_sha1(file_id):
808
raise WorkingTreeNotRevision(self.this_tree)
1608
810
def _merged_lines(self, file_id):
1609
811
"""Generate the merged lines.
1610
812
There is no distinction between lines that are meant to contain <<<<<<<
1614
base = self.base_tree
1617
plan = self._generate_merge_plan(file_id, base)
1618
if 'merge' in debug.debug_flags:
1620
trans_id = self.tt.trans_id_file_id(file_id)
1621
name = self.tt.final_name(trans_id) + '.plan'
1622
contents = ('%11s|%s' % l for l in plan)
1623
self.tt.new_file(name, self.tt.final_parent(trans_id), contents)
1624
textmerge = versionedfile.PlanWeaveMerge(plan, '<<<<<<< TREE\n',
1625
'>>>>>>> MERGE-SOURCE\n')
1626
lines, conflicts = textmerge.merge_lines(self.reprocess)
1628
base_lines = textmerge.base_from_plan()
1631
return lines, base_lines
815
weave = self.this_revision_tree.get_weave(file_id)
816
this_revision_id = self.this_revision_tree.inventory[file_id].revision
817
other_revision_id = \
818
self.other_revision_tree.inventory[file_id].revision
819
wm = WeaveMerge(weave, this_revision_id, other_revision_id,
820
'<<<<<<< TREE\n', '>>>>>>> MERGE-SOURCE\n')
821
return wm.merge_lines(self.reprocess)
1633
823
def text_merge(self, file_id, trans_id):
1634
824
"""Perform a (weave) text merge for a given file and file-id.
1635
825
If conflicts are encountered, .THIS and .OTHER files will be emitted,
1636
826
and a conflict will be noted.
1638
lines, base_lines = self._merged_lines(file_id)
828
self._check_file(file_id)
829
lines, conflicts = self._merged_lines(file_id)
1639
830
lines = list(lines)
1640
# Note we're checking whether the OUTPUT is binary in this case,
831
# Note we're checking whether the OUTPUT is binary in this case,
1641
832
# because we don't want to get into weave merge guts.
1642
textfile.check_text_lines(lines)
833
check_text_lines(lines)
1643
834
self.tt.create_file(lines, trans_id)
1644
if base_lines is not None:
1646
836
self._raw_conflicts.append(('text conflict', trans_id))
1647
837
name = self.tt.final_name(trans_id)
1648
838
parent_id = self.tt.final_parent(trans_id)
1649
file_group = self._dump_conflicts(name, parent_id, file_id,
1651
base_lines=base_lines)
839
file_group = self._dump_conflicts(name, parent_id, file_id,
1652
841
file_group.append(trans_id)
1655
class LCAMerger(WeaveMerger):
1657
def _generate_merge_plan(self, file_id, base):
1658
return self.this_tree.plan_file_lca_merge(file_id, self.other_tree,
1661
844
class Diff3Merger(Merge3Merger):
1662
845
"""Three-way merger using external diff3 for text merging"""
1664
846
def dump_file(self, temp_dir, name, tree, file_id):
1665
out_path = osutils.pathjoin(temp_dir, name)
1666
out_file = open(out_path, "wb")
1668
in_file = tree.get_file(file_id)
1669
for line in in_file:
1670
out_file.write(line)
847
out_path = pathjoin(temp_dir, name)
848
out_file = file(out_path, "wb")
849
in_file = tree.get_file(file_id)
1675
854
def text_merge(self, file_id, trans_id):
1678
857
will be dumped, and a will be conflict noted.
1680
859
import bzrlib.patch
1681
temp_dir = osutils.mkdtemp(prefix="bzr-")
860
temp_dir = mkdtemp(prefix="bzr-")
1683
new_file = osutils.pathjoin(temp_dir, "new")
862
new_file = pathjoin(temp_dir, "new")
1684
863
this = self.dump_file(temp_dir, "this", self.this_tree, file_id)
1685
864
base = self.dump_file(temp_dir, "base", self.base_tree, file_id)
1686
865
other = self.dump_file(temp_dir, "other", self.other_tree, file_id)
1687
866
status = bzrlib.patch.diff3(new_file, this, base, other)
1688
867
if status not in (0, 1):
1689
raise errors.BzrError("Unhandled diff3 exit code")
1690
f = open(new_file, 'rb')
1692
self.tt.create_file(f, trans_id)
868
raise BzrError("Unhandled diff3 exit code")
869
self.tt.create_file(file(new_file, "rb"), trans_id)
1696
871
name = self.tt.final_name(trans_id)
1697
872
parent_id = self.tt.final_parent(trans_id)
1698
873
self._dump_conflicts(name, parent_id, file_id)
1699
self._raw_conflicts.append(('text conflict', trans_id))
874
self._raw_conflicts.append(('text conflict', trans_id))
1701
osutils.rmtree(temp_dir)
1704
879
def merge_inner(this_branch, other_tree, base_tree, ignore_zero=False,
1706
merge_type=Merge3Merger,
1707
interesting_ids=None,
881
merge_type=Merge3Merger,
882
interesting_ids=None,
1710
885
other_rev_id=None,
1711
886
interesting_files=None,
1714
change_reporter=None):
1715
"""Primary interface for merging.
889
"""Primary interface for merging.
1717
typical use is probably
891
typical use is probably
1718
892
'merge_inner(branch, branch.get_revision_tree(other_revision),
1719
893
branch.get_revision_tree(base_revision))'
1721
895
if this_tree is None:
1722
raise errors.BzrError("bzrlib.merge.merge_inner requires a this_tree "
1723
"parameter as of bzrlib version 0.8.")
1724
merger = Merger(this_branch, other_tree, base_tree, this_tree=this_tree,
1725
pb=pb, change_reporter=change_reporter)
896
warn("bzrlib.merge.merge_inner requires a this_tree parameter as of "
897
"bzrlib version 0.8.",
900
this_tree = this_branch.bzrdir.open_workingtree()
901
merger = Merger(this_branch, other_tree, base_tree, this_tree=this_tree,
1726
903
merger.backup_files = backup_files
1727
904
merger.merge_type = merge_type
1728
905
merger.interesting_ids = interesting_ids
1729
906
merger.ignore_zero = ignore_zero
1730
907
if interesting_files:
1732
raise ValueError('Only supply interesting_ids'
1733
' or interesting_files')
1734
merger.interesting_files = interesting_files
1735
merger.show_base = show_base
908
assert not interesting_ids, ('Only supply interesting_ids'
909
' or interesting_files')
910
merger._set_interesting_files(interesting_files)
911
merger.show_base = show_base
1736
912
merger.reprocess = reprocess
1737
913
merger.other_rev_id = other_rev_id
1738
914
merger.other_basis = other_rev_id
1739
get_revision_id = getattr(base_tree, 'get_revision_id', None)
1740
if get_revision_id is None:
1741
get_revision_id = base_tree.last_revision
1742
merger.cache_trees_with_revision_ids([other_tree, base_tree, this_tree])
1743
merger.set_base_revision(get_revision_id(), this_branch)
1744
915
return merger.do_merge()
1746
def get_merge_type_registry():
1747
"""Merge type registry is in bzrlib.option to avoid circular imports.
1749
This method provides a sanctioned way to retrieve it.
1751
from bzrlib import option
1752
return option._merge_type_registry
1755
def _plan_annotate_merge(annotated_a, annotated_b, ancestors_a, ancestors_b):
1756
def status_a(revision, text):
1757
if revision in ancestors_b:
1758
return 'killed-b', text
1760
return 'new-a', text
1762
def status_b(revision, text):
1763
if revision in ancestors_a:
1764
return 'killed-a', text
1766
return 'new-b', text
1768
plain_a = [t for (a, t) in annotated_a]
1769
plain_b = [t for (a, t) in annotated_b]
1770
matcher = patiencediff.PatienceSequenceMatcher(None, plain_a, plain_b)
1771
blocks = matcher.get_matching_blocks()
1774
for ai, bi, l in blocks:
1775
# process all mismatched sections
1776
# (last mismatched section is handled because blocks always
1777
# includes a 0-length last block)
1778
for revision, text in annotated_a[a_cur:ai]:
1779
yield status_a(revision, text)
1780
for revision, text in annotated_b[b_cur:bi]:
1781
yield status_b(revision, text)
1782
# and now the matched section
1785
for text_a in plain_a[ai:a_cur]:
1786
yield "unchanged", text_a
1789
class _PlanMergeBase(object):
1791
def __init__(self, a_rev, b_rev, vf, key_prefix):
1794
:param a_rev: Revision-id of one revision to merge
1795
:param b_rev: Revision-id of the other revision to merge
1796
:param vf: A VersionedFiles containing both revisions
1797
:param key_prefix: A prefix for accessing keys in vf, typically
1803
self._last_lines = None
1804
self._last_lines_revision_id = None
1805
self._cached_matching_blocks = {}
1806
self._key_prefix = key_prefix
1807
self._precache_tip_lines()
1809
def _precache_tip_lines(self):
1810
lines = self.get_lines([self.a_rev, self.b_rev])
1811
self.lines_a = lines[self.a_rev]
1812
self.lines_b = lines[self.b_rev]
1814
def get_lines(self, revisions):
1815
"""Get lines for revisions from the backing VersionedFiles.
1817
:raises RevisionNotPresent: on absent texts.
1819
keys = [(self._key_prefix + (rev,)) for rev in revisions]
1821
for record in self.vf.get_record_stream(keys, 'unordered', True):
1822
if record.storage_kind == 'absent':
1823
raise errors.RevisionNotPresent(record.key, self.vf)
1824
result[record.key[-1]] = osutils.chunks_to_lines(
1825
record.get_bytes_as('chunked'))
1828
def plan_merge(self):
1829
"""Generate a 'plan' for merging the two revisions.
1831
This involves comparing their texts and determining the cause of
1832
differences. If text A has a line and text B does not, then either the
1833
line was added to text A, or it was deleted from B. Once the causes
1834
are combined, they are written out in the format described in
1835
VersionedFile.plan_merge
1837
blocks = self._get_matching_blocks(self.a_rev, self.b_rev)
1838
unique_a, unique_b = self._unique_lines(blocks)
1839
new_a, killed_b = self._determine_status(self.a_rev, unique_a)
1840
new_b, killed_a = self._determine_status(self.b_rev, unique_b)
1841
return self._iter_plan(blocks, new_a, killed_b, new_b, killed_a)
1843
def _iter_plan(self, blocks, new_a, killed_b, new_b, killed_a):
1846
for i, j, n in blocks:
1847
for a_index in range(last_i, i):
1848
if a_index in new_a:
1849
if a_index in killed_b:
1850
yield 'conflicted-a', self.lines_a[a_index]
1852
yield 'new-a', self.lines_a[a_index]
1854
yield 'killed-b', self.lines_a[a_index]
1855
for b_index in range(last_j, j):
1856
if b_index in new_b:
1857
if b_index in killed_a:
1858
yield 'conflicted-b', self.lines_b[b_index]
1860
yield 'new-b', self.lines_b[b_index]
1862
yield 'killed-a', self.lines_b[b_index]
1863
# handle common lines
1864
for a_index in range(i, i+n):
1865
yield 'unchanged', self.lines_a[a_index]
1869
def _get_matching_blocks(self, left_revision, right_revision):
1870
"""Return a description of which sections of two revisions match.
1872
See SequenceMatcher.get_matching_blocks
1874
cached = self._cached_matching_blocks.get((left_revision,
1876
if cached is not None:
1878
if self._last_lines_revision_id == left_revision:
1879
left_lines = self._last_lines
1880
right_lines = self.get_lines([right_revision])[right_revision]
1882
lines = self.get_lines([left_revision, right_revision])
1883
left_lines = lines[left_revision]
1884
right_lines = lines[right_revision]
1885
self._last_lines = right_lines
1886
self._last_lines_revision_id = right_revision
1887
matcher = patiencediff.PatienceSequenceMatcher(None, left_lines,
1889
return matcher.get_matching_blocks()
1891
def _unique_lines(self, matching_blocks):
1892
"""Analyse matching_blocks to determine which lines are unique
1894
:return: a tuple of (unique_left, unique_right), where the values are
1895
sets of line numbers of unique lines.
1901
for i, j, n in matching_blocks:
1902
unique_left.extend(range(last_i, i))
1903
unique_right.extend(range(last_j, j))
1906
return unique_left, unique_right
1909
def _subtract_plans(old_plan, new_plan):
1910
"""Remove changes from new_plan that came from old_plan.
1912
It is assumed that the difference between the old_plan and new_plan
1913
is their choice of 'b' text.
1915
All lines from new_plan that differ from old_plan are emitted
1916
verbatim. All lines from new_plan that match old_plan but are
1917
not about the 'b' revision are emitted verbatim.
1919
Lines that match and are about the 'b' revision are the lines we
1920
don't want, so we convert 'killed-b' -> 'unchanged', and 'new-b'
1921
is skipped entirely.
1923
matcher = patiencediff.PatienceSequenceMatcher(None, old_plan,
1926
for i, j, n in matcher.get_matching_blocks():
1927
for jj in range(last_j, j):
1929
for jj in range(j, j+n):
1930
plan_line = new_plan[jj]
1931
if plan_line[0] == 'new-b':
1933
elif plan_line[0] == 'killed-b':
1934
yield 'unchanged', plan_line[1]
1940
class _PlanMerge(_PlanMergeBase):
1941
"""Plan an annotate merge using on-the-fly annotation"""
1943
def __init__(self, a_rev, b_rev, vf, key_prefix):
1944
super(_PlanMerge, self).__init__(a_rev, b_rev, vf, key_prefix)
1945
self.a_key = self._key_prefix + (self.a_rev,)
1946
self.b_key = self._key_prefix + (self.b_rev,)
1947
self.graph = _mod_graph.Graph(self.vf)
1948
heads = self.graph.heads((self.a_key, self.b_key))
1950
# one side dominates, so we can just return its values, yay for
1952
# Ideally we would know that before we get this far
1953
self._head_key = heads.pop()
1954
if self._head_key == self.a_key:
1958
trace.mutter('found dominating revision for %s\n%s > %s', self.vf,
1959
self._head_key[-1], other)
1962
self._head_key = None
1965
def _precache_tip_lines(self):
1966
# Turn this into a no-op, because we will do this later
1969
def _find_recursive_lcas(self):
1970
"""Find all the ancestors back to a unique lca"""
1971
cur_ancestors = (self.a_key, self.b_key)
1972
# graph.find_lca(uncommon, keys) now returns plain NULL_REVISION,
1973
# rather than a key tuple. We will just map that directly to no common
1977
next_lcas = self.graph.find_lca(*cur_ancestors)
1978
# Map a plain NULL_REVISION to a simple no-ancestors
1979
if next_lcas == set([_mod_revision.NULL_REVISION]):
1981
# Order the lca's based on when they were merged into the tip
1982
# While the actual merge portion of weave merge uses a set() of
1983
# active revisions, the order of insertion *does* effect the
1984
# implicit ordering of the texts.
1985
for rev_key in cur_ancestors:
1986
ordered_parents = tuple(self.graph.find_merge_order(rev_key,
1988
parent_map[rev_key] = ordered_parents
1989
if len(next_lcas) == 0:
1991
elif len(next_lcas) == 1:
1992
parent_map[list(next_lcas)[0]] = ()
1994
elif len(next_lcas) > 2:
1995
# More than 2 lca's, fall back to grabbing all nodes between
1996
# this and the unique lca.
1997
trace.mutter('More than 2 LCAs, falling back to all nodes for:'
1999
self.a_key, self.b_key, cur_ancestors)
2000
cur_lcas = next_lcas
2001
while len(cur_lcas) > 1:
2002
cur_lcas = self.graph.find_lca(*cur_lcas)
2003
if len(cur_lcas) == 0:
2004
# No common base to find, use the full ancestry
2007
unique_lca = list(cur_lcas)[0]
2008
if unique_lca == _mod_revision.NULL_REVISION:
2009
# find_lca will return a plain 'NULL_REVISION' rather
2010
# than a key tuple when there is no common ancestor, we
2011
# prefer to just use None, because it doesn't confuse
2012
# _get_interesting_texts()
2014
parent_map.update(self._find_unique_parents(next_lcas,
2017
cur_ancestors = next_lcas
2020
def _find_unique_parents(self, tip_keys, base_key):
2021
"""Find ancestors of tip that aren't ancestors of base.
2023
:param tip_keys: Nodes that are interesting
2024
:param base_key: Cull all ancestors of this node
2025
:return: The parent map for all revisions between tip_keys and
2026
base_key. base_key will be included. References to nodes outside of
2027
the ancestor set will also be removed.
2029
# TODO: this would be simpler if find_unique_ancestors took a list
2030
# instead of a single tip, internally it supports it, but it
2031
# isn't a "backwards compatible" api change.
2032
if base_key is None:
2033
parent_map = dict(self.graph.iter_ancestry(tip_keys))
2034
# We remove NULL_REVISION because it isn't a proper tuple key, and
2035
# thus confuses things like _get_interesting_texts, and our logic
2036
# to add the texts into the memory weave.
2037
if _mod_revision.NULL_REVISION in parent_map:
2038
parent_map.pop(_mod_revision.NULL_REVISION)
2041
for tip in tip_keys:
2043
self.graph.find_unique_ancestors(tip, [base_key]))
2044
parent_map = self.graph.get_parent_map(interesting)
2045
parent_map[base_key] = ()
2046
culled_parent_map, child_map, tails = self._remove_external_references(
2048
# Remove all the tails but base_key
2049
if base_key is not None:
2050
tails.remove(base_key)
2051
self._prune_tails(culled_parent_map, child_map, tails)
2052
# Now remove all the uninteresting 'linear' regions
2053
simple_map = _mod_graph.collapse_linear_regions(culled_parent_map)
2057
def _remove_external_references(parent_map):
2058
"""Remove references that go outside of the parent map.
2060
:param parent_map: Something returned from Graph.get_parent_map(keys)
2061
:return: (filtered_parent_map, child_map, tails)
2062
filtered_parent_map is parent_map without external references
2063
child_map is the {parent_key: [child_keys]} mapping
2064
tails is a list of nodes that do not have any parents in the map
2066
# TODO: The basic effect of this function seems more generic than
2067
# _PlanMerge. But the specific details of building a child_map,
2068
# and computing tails seems very specific to _PlanMerge.
2069
# Still, should this be in Graph land?
2070
filtered_parent_map = {}
2073
for key, parent_keys in parent_map.iteritems():
2074
culled_parent_keys = [p for p in parent_keys if p in parent_map]
2075
if not culled_parent_keys:
2077
for parent_key in culled_parent_keys:
2078
child_map.setdefault(parent_key, []).append(key)
2079
# TODO: Do we want to do this, it adds overhead for every node,
2080
# just to say that the node has no children
2081
child_map.setdefault(key, [])
2082
filtered_parent_map[key] = culled_parent_keys
2083
return filtered_parent_map, child_map, tails
2086
def _prune_tails(parent_map, child_map, tails_to_remove):
2087
"""Remove tails from the parent map.
2089
This will remove the supplied revisions until no more children have 0
2092
:param parent_map: A dict of {child: [parents]}, this dictionary will
2093
be modified in place.
2094
:param tails_to_remove: A list of tips that should be removed,
2095
this list will be consumed
2096
:param child_map: The reverse dict of parent_map ({parent: [children]})
2097
this dict will be modified
2098
:return: None, parent_map will be modified in place.
2100
while tails_to_remove:
2101
next = tails_to_remove.pop()
2102
parent_map.pop(next)
2103
children = child_map.pop(next)
2104
for child in children:
2105
child_parents = parent_map[child]
2106
child_parents.remove(next)
2107
if len(child_parents) == 0:
2108
tails_to_remove.append(child)
2110
def _get_interesting_texts(self, parent_map):
2111
"""Return a dict of texts we are interested in.
2113
Note that the input is in key tuples, but the output is in plain
2116
:param parent_map: The output from _find_recursive_lcas
2117
:return: A dict of {'revision_id':lines} as returned by
2118
_PlanMergeBase.get_lines()
2120
all_revision_keys = set(parent_map)
2121
all_revision_keys.add(self.a_key)
2122
all_revision_keys.add(self.b_key)
2124
# Everything else is in 'keys' but get_lines is in 'revision_ids'
2125
all_texts = self.get_lines([k[-1] for k in all_revision_keys])
2128
def _build_weave(self):
2129
from bzrlib import weave
2130
self._weave = weave.Weave(weave_name='in_memory_weave',
2131
allow_reserved=True)
2132
parent_map = self._find_recursive_lcas()
2134
all_texts = self._get_interesting_texts(parent_map)
2136
# Note: Unfortunately, the order given by topo_sort will effect the
2137
# ordering resolution in the output. Specifically, if you add A then B,
2138
# then in the output text A lines will show up before B lines. And, of
2139
# course, topo_sort doesn't guarantee any real ordering.
2140
# So we use merge_sort, and add a fake node on the tip.
2141
# This ensures that left-hand parents will always be inserted into the
2142
# weave before right-hand parents.
2143
tip_key = self._key_prefix + (_mod_revision.CURRENT_REVISION,)
2144
parent_map[tip_key] = (self.a_key, self.b_key)
2146
for seq_num, key, depth, eom in reversed(tsort.merge_sort(parent_map,
2150
# for key in tsort.topo_sort(parent_map):
2151
parent_keys = parent_map[key]
2152
revision_id = key[-1]
2153
parent_ids = [k[-1] for k in parent_keys]
2154
self._weave.add_lines(revision_id, parent_ids,
2155
all_texts[revision_id])
2157
def plan_merge(self):
2158
"""Generate a 'plan' for merging the two revisions.
2160
This involves comparing their texts and determining the cause of
2161
differences. If text A has a line and text B does not, then either the
2162
line was added to text A, or it was deleted from B. Once the causes
2163
are combined, they are written out in the format described in
2164
VersionedFile.plan_merge
2166
if self._head_key is not None: # There was a single head
2167
if self._head_key == self.a_key:
2170
if self._head_key != self.b_key:
2171
raise AssertionError('There was an invalid head: %s != %s'
2172
% (self.b_key, self._head_key))
2174
head_rev = self._head_key[-1]
2175
lines = self.get_lines([head_rev])[head_rev]
2176
return ((plan, line) for line in lines)
2177
return self._weave.plan_merge(self.a_rev, self.b_rev)
2180
class _PlanLCAMerge(_PlanMergeBase):
2182
This merge algorithm differs from _PlanMerge in that:
2183
1. comparisons are done against LCAs only
2184
2. cases where a contested line is new versus one LCA but old versus
2185
another are marked as conflicts, by emitting the line as conflicted-a
2188
This is faster, and hopefully produces more useful output.
2191
def __init__(self, a_rev, b_rev, vf, key_prefix, graph):
2192
_PlanMergeBase.__init__(self, a_rev, b_rev, vf, key_prefix)
2193
lcas = graph.find_lca(key_prefix + (a_rev,), key_prefix + (b_rev,))
2196
if lca == _mod_revision.NULL_REVISION:
2199
self.lcas.add(lca[-1])
2200
for lca in self.lcas:
2201
if _mod_revision.is_null(lca):
2204
lca_lines = self.get_lines([lca])[lca]
2205
matcher = patiencediff.PatienceSequenceMatcher(None, self.lines_a,
2207
blocks = list(matcher.get_matching_blocks())
2208
self._cached_matching_blocks[(a_rev, lca)] = blocks
2209
matcher = patiencediff.PatienceSequenceMatcher(None, self.lines_b,
2211
blocks = list(matcher.get_matching_blocks())
2212
self._cached_matching_blocks[(b_rev, lca)] = blocks
2214
def _determine_status(self, revision_id, unique_line_numbers):
2215
"""Determines the status unique lines versus all lcas.
2217
Basically, determines why the line is unique to this revision.
2219
A line may be determined new, killed, or both.
2221
If a line is determined new, that means it was not present in at least
2222
one LCA, and is not present in the other merge revision.
2224
If a line is determined killed, that means the line was present in
2227
If a line is killed and new, this indicates that the two merge
2228
revisions contain differing conflict resolutions.
2229
:param revision_id: The id of the revision in which the lines are
2231
:param unique_line_numbers: The line numbers of unique lines.
2232
:return a tuple of (new_this, killed_other):
2236
unique_line_numbers = set(unique_line_numbers)
2237
for lca in self.lcas:
2238
blocks = self._get_matching_blocks(revision_id, lca)
2239
unique_vs_lca, _ignored = self._unique_lines(blocks)
2240
new.update(unique_line_numbers.intersection(unique_vs_lca))
2241
killed.update(unique_line_numbers.difference(unique_vs_lca))
918
merge_types = { "merge3": (Merge3Merger, "Native diff3-style merge"),
919
"diff3": (Diff3Merger, "Merge using external diff3"),
920
'weave': (WeaveMerger, "Weave-based merge")
924
def merge_type_help():
925
templ = '%s%%7s: %%s' % (' '*12)
926
lines = [templ % (f[0], f[1][1]) for f in merge_types.iteritems()]
927
return '\n'.join(lines)
added
removed
bzrlib/merge.py
