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from merge_core import merge_flex
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from changeset import generate_changeset, ExceptionConflictHandler
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from changeset import Inventory
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from bzrlib import find_branch
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from bzrlib.errors import BzrCommandError
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from bzrlib.diff import compare_trees
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from trace import mutter, warning
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# Copyright (C) 2005, 2006, 2008 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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class UnrelatedBranches(BzrCommandError):
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msg = "Branches have no common ancestor, and no base revision"\
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BzrCommandError.__init__(self, msg)
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class MergeConflictHandler(ExceptionConflictHandler):
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"""Handle conflicts encountered while merging"""
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def __init__(self, dir, ignore_zero=False):
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ExceptionConflictHandler.__init__(self, dir)
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self.ignore_zero = ignore_zero
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def copy(self, source, dest):
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"""Copy the text and mode of a file
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:param source: The path of the file to copy
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:param dest: The distination file to create
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s_file = file(source, "rb")
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d_file = file(dest, "wb")
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os.chmod(dest, 0777 & os.stat(source).st_mode)
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def add_suffix(self, name, suffix, last_new_name=None):
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"""Rename a file to append a suffix. If the new name exists, the
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suffix is added repeatedly until a non-existant name is found
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:param name: The path of the file
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:param suffix: The suffix to append
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:param last_new_name: (used for recursive calls) the last name tried
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if last_new_name is None:
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new_name = last_new_name+suffix
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os.rename(name, new_name)
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if e.errno != errno.EEXIST and e.errno != errno.ENOTEMPTY:
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return self.add_suffix(name, suffix, last_new_name=new_name)
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def conflict(self, text):
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def merge_conflict(self, new_file, this_path, base_path, other_path):
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Handle diff3 conflicts by producing a .THIS, .BASE and .OTHER. The
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main file will be a version with diff3 conflicts.
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:param new_file: Path to the output file with diff3 markers
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:param this_path: Path to the file text for the THIS tree
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:param base_path: Path to the file text for the BASE tree
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:param other_path: Path to the file text for the OTHER tree
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self.add_suffix(this_path, ".THIS")
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self.copy(base_path, this_path+".BASE")
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self.copy(other_path, this_path+".OTHER")
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os.rename(new_file, this_path)
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self.conflict("Diff3 conflict encountered in %s" % this_path)
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def target_exists(self, entry, target, old_path):
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"""Handle the case when the target file or dir exists"""
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moved_path = self.add_suffix(target, ".moved")
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self.conflict("Moved existing %s to %s" % (target, moved_path))
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def rmdir_non_empty(self, filename):
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"""Handle the case where the dir to be removed still has contents"""
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self.conflict("Directory %s not removed because it is not empty"\
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if not self.ignore_zero:
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print "%d conflicts encountered.\n" % self.conflicts
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class SourceFile(object):
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def __init__(self, path, id, present=None, isdir=None):
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self.present = present
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self.interesting = True
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return "SourceFile(%s, %s)" % (self.path, self.id)
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def get_tree(treespec, temp_root, label):
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location, revno = treespec
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branch = find_branch(location)
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base_tree = branch.working_tree()
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base_tree = branch.basis_tree()
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base_tree = branch.revision_tree(branch.lookup_revision(revno))
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temp_path = os.path.join(temp_root, label)
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return branch, MergeTree(base_tree, temp_path)
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def abspath(tree, file_id):
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path = tree.inventory.id2path(file_id)
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def file_exists(tree, file_id):
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return tree.has_filename(tree.id2path(file_id))
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def inventory_map(tree):
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for file_id in tree.inventory:
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path = abspath(tree, file_id)
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inventory[path] = SourceFile(path, file_id)
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class MergeTree(object):
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def __init__(self, tree, tempdir):
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from itertools import chain
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revision as _mod_revision,
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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.errors import (BzrCommandError,
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WorkingTreeNotRevision,
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from bzrlib.graph import Graph
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from bzrlib.merge3 import Merge3
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from bzrlib.osutils import rename, pathjoin
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from progress import DummyProgress, ProgressPhase
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from bzrlib.revision import (NULL_REVISION, ensure_null)
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from bzrlib.textfile import check_text_lines
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from bzrlib.trace import mutter, warning, note, is_quiet
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from bzrlib.transform import (TransformPreview, TreeTransform,
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resolve_conflicts, cook_conflicts,
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conflict_pass, FinalPaths, create_from_tree,
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unique_add, ROOT_PARENT)
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from bzrlib.versionedfile import PlanWeaveMerge
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# TODO: Report back as changes are merged in
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def transform_tree(from_tree, to_tree, interesting_ids=None):
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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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def __init__(self, this_branch, other_tree=None, base_tree=None,
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this_tree=None, pb=DummyProgress(), change_reporter=None,
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recurse='down', revision_graph=None):
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object.__init__(self)
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if hasattr(tree, "basedir"):
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self.root = tree.basedir
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self.inventory = inventory_map(tree)
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self.tempdir = tempdir
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os.mkdir(os.path.join(self.tempdir, "texts"))
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def readonly_path(self, id):
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if id not in self.tree:
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if self.root is not None:
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return self.tree.abspath(self.tree.id2path(id))
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if self.tree.inventory[id].kind in ("directory", "root_directory"):
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if not self.cached.has_key(id):
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path = os.path.join(self.tempdir, "texts", id)
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outfile = file(path, "wb")
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outfile.write(self.tree.get_file(id).read())
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assert(os.path.exists(path))
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self.cached[id] = path
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return self.cached[id]
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def merge(other_revision, base_revision,
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check_clean=True, ignore_zero=False,
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"""Merge changes into a tree.
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Base for three-way merge.
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Other revision for three-way merge.
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Directory to merge changes into; '.' by default.
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If true, this_dir must have no uncommitted changes before the
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tempdir = tempfile.mkdtemp(prefix="bzr-")
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this_branch = find_branch(this_dir)
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self.this_branch = this_branch
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self.this_basis = _mod_revision.ensure_null(
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this_branch.last_revision())
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self.this_rev_id = None
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self.this_tree = this_tree
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self.this_revision_tree = None
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self.this_basis_tree = None
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self.other_tree = other_tree
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self.other_branch = None
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self.base_tree = base_tree
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self.ignore_zero = False
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self.backup_files = False
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self.interesting_ids = None
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self.interesting_files = None
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self.show_base = False
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self.reprocess = False
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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 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, 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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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 = Branch.open_containing(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 = ensure_null(revision_id)
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return branch, self.revision_tree(revision_id, branch)
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def ensure_revision_trees(self):
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if self.this_revision_tree is None:
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self.this_basis_tree = self.revision_tree(self.this_basis)
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if self.this_basis == self.this_rev_id:
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self.this_revision_tree = self.this_basis_tree
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if self.other_rev_id is None:
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other_basis_tree = self.revision_tree(self.other_basis)
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changes = other_basis_tree.changes_from(self.other_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 = self.other_basis
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self.other_tree = other_basis_tree
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def file_revisions(self, file_id):
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self.ensure_revision_trees()
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def get_id(tree, file_id):
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revision_id = tree.inventory[file_id].revision
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if self.this_rev_id is None:
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if self.this_basis_tree.get_file_sha1(file_id) != \
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self.this_tree.get_file_sha1(file_id):
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raise 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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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 BzrCommandError("This branch has no commits."
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" (perhaps you would prefer 'bzr pull')")
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changes = compare_trees(this_branch.working_tree(),
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this_branch.basis_tree(), False)
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if changes.has_changed():
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raise BzrCommandError("Working tree has uncommitted changes.")
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other_branch, other_tree = get_tree(other_revision, tempdir, "other")
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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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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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changes = self.this_tree.changes_from(basis_tree)
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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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def set_pending(self):
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if not self.base_is_ancestor or not self.base_is_other_ancestor 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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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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new_parent_trees.append((revision_id, tree))
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self.this_tree.set_parent_trees(new_parent_trees,
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allow_leftmost_as_ghost=True)
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for _revision_id, tree in new_parent_trees:
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def set_other(self, other_revision, possible_transports=None):
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"""Set the revision and tree to merge from.
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This sets the other_tree, other_rev_id, other_basis attributes.
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:param other_revision: The [path, revision] list to merge from.
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self.other_branch, self.other_tree = self._get_tree(other_revision,
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if other_revision[1] == -1:
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self.other_rev_id = _mod_revision.ensure_null(
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self.other_branch.last_revision())
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if _mod_revision.is_null(self.other_rev_id):
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raise NoCommits(self.other_branch)
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self.other_basis = self.other_rev_id
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elif other_revision[1] is not None:
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self.other_rev_id = self.other_branch.get_rev_id(other_revision[1])
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self.other_basis = self.other_rev_id
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self.other_rev_id = None
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self.other_basis = self.other_branch.last_revision()
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if self.other_basis is None:
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raise 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 = [ensure_null(self.this_basis),
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ensure_null(self.other_basis)]
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if NULL_REVISION in revisions:
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self.base_rev_id = NULL_REVISION
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self.base_tree = self.revision_tree(self.base_rev_id)
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self._is_criss_cross = False
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lcas = self.revision_graph.find_lca(revisions[0], revisions[1])
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self._is_criss_cross = False
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self.base_rev_id = NULL_REVISION
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self.base_rev_id = list(lcas)[0]
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else: # len(lcas) > 1
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# find_unique_lca can only handle 2 nodes, so we have to
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# start back at the beginning. It is a shame to traverse
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# the graph again, but better than re-implementing
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self.base_rev_id = self.revision_graph.find_unique_lca(
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revisions[0], revisions[1])
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self.base_rev_id = self.revision_graph.find_unique_lca(
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self._is_criss_cross = True
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if self.base_rev_id == NULL_REVISION:
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raise UnrelatedBranches()
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if self._is_criss_cross:
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warning('Warning: criss-cross merge encountered. See bzr'
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' help criss-cross.')
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mutter('Criss-cross lcas: %r' % lcas)
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interesting_revision_ids = [self.base_rev_id]
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interesting_revision_ids.extend(lcas)
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interesting_trees = dict((t.get_revision_id(), t)
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for t in self.this_branch.repository.revision_trees(
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interesting_revision_ids))
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self._cached_trees.update(interesting_trees)
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self.base_tree = interesting_trees.pop(self.base_rev_id)
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sorted_lca_keys = self.revision_graph.find_merge_order(
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self._lca_trees = [interesting_trees[key]
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for key in sorted_lca_keys]
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self.base_tree = self.revision_tree(self.base_rev_id)
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self.base_is_ancestor = True
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self.base_is_other_ancestor = True
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mutter('Base revid: %r' % self.base_rev_id)
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def set_base(self, base_revision):
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"""Set the base revision to use for the merge.
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:param base_revision: A 2-list containing a path and revision number.
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mutter("doing merge() with no base_revision specified")
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if base_revision == [None, None]:
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if other_revision[1] == -1:
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o_revno = other_revision[1]
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base_revno = this_branch.common_ancestor(other_branch,
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other_revno=o_revno)[0]
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if base_revno is None:
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raise UnrelatedBranches()
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base_revision = ['.', base_revno]
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base_branch, base_tree = get_tree(base_revision, tempdir, "base")
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merge_inner(this_branch, other_tree, base_tree, tempdir,
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ignore_zero=ignore_zero)
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shutil.rmtree(tempdir)
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def generate_cset_optimized(tree_a, tree_b, inventory_a, inventory_b):
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"""Generate a changeset, using the text_id to mark really-changed files.
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This permits blazing comparisons when text_ids are present. It also
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disables metadata comparison for files with identical texts.
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for file_id in tree_a.tree.inventory:
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if file_id not in tree_b.tree.inventory:
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entry_a = tree_a.tree.inventory[file_id]
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entry_b = tree_b.tree.inventory[file_id]
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if (entry_a.kind, entry_b.kind) != ("file", "file"):
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if None in (entry_a.text_id, entry_b.text_id):
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if entry_a.text_id != entry_b.text_id:
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inventory_a[abspath(tree_a.tree, file_id)].interesting = False
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inventory_b[abspath(tree_b.tree, file_id)].interesting = False
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cset = generate_changeset(tree_a, tree_b, inventory_a, inventory_b)
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for entry in cset.entries.itervalues():
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entry.metadata_change = None
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def merge_inner(this_branch, other_tree, base_tree, tempdir,
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this_tree = get_tree((this_branch.base, None), tempdir, "this")[1]
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def get_inventory(tree):
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return tree.inventory
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inv_changes = merge_flex(this_tree, base_tree, other_tree,
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generate_cset_optimized, get_inventory,
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MergeConflictHandler(base_tree.root,
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ignore_zero=ignore_zero))
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for id, path in inv_changes.iteritems():
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assert path.startswith('./')
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adjust_ids.append((path, id))
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this_branch.set_inventory(regen_inventory(this_branch, this_tree.root, adjust_ids))
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def regen_inventory(this_branch, root, new_entries):
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old_entries = this_branch.read_working_inventory()
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for file_id in old_entries:
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entry = old_entries[file_id]
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path = old_entries.id2path(file_id)
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new_inventory[file_id] = (path, file_id, entry.parent_id, entry.kind)
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by_path[path] = file_id
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for path, file_id in new_entries:
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del new_inventory[file_id]
275
new_path_list.append((path, file_id))
276
if file_id not in old_entries:
278
# Ensure no file is added before its parent
280
for path, file_id in new_path_list:
284
parent = by_path[os.path.dirname(path)]
285
kind = bzrlib.osutils.file_kind(os.path.join(root, path))
286
new_inventory[file_id] = (path, file_id, parent, kind)
287
by_path[path] = file_id
289
# Get a list in insertion order
290
new_inventory_list = new_inventory.values()
291
mutter ("""Inventory regeneration:
292
old length: %i insertions: %i deletions: %i new_length: %i"""\
293
% (len(old_entries), insertions, deletions, len(new_inventory_list)))
294
assert len(new_inventory_list) == len(old_entries) + insertions - deletions
295
new_inventory_list.sort()
296
return new_inventory_list
420
base_branch, self.base_tree = self._get_tree(base_revision)
421
if base_revision[1] == -1:
422
self.base_rev_id = base_branch.last_revision()
423
elif base_revision[1] is None:
424
self.base_rev_id = _mod_revision.NULL_REVISION
426
self.base_rev_id = _mod_revision.ensure_null(
427
base_branch.get_rev_id(base_revision[1]))
428
self._maybe_fetch(base_branch, self.this_branch, self.base_rev_id)
430
def make_merger(self):
431
kwargs = {'working_tree':self.this_tree, 'this_tree': self.this_tree,
432
'other_tree': self.other_tree,
433
'interesting_ids': self.interesting_ids,
434
'interesting_files': self.interesting_files,
437
if self.merge_type.requires_base:
438
kwargs['base_tree'] = self.base_tree
439
if self.merge_type.supports_reprocess:
440
kwargs['reprocess'] = self.reprocess
442
raise BzrError("Conflict reduction is not supported for merge"
443
" type %s." % self.merge_type)
444
if self.merge_type.supports_show_base:
445
kwargs['show_base'] = self.show_base
447
raise BzrError("Showing base is not supported for this"
448
" merge type. %s" % self.merge_type)
449
if (not getattr(self.merge_type, 'supports_reverse_cherrypick', True)
450
and not self.base_is_other_ancestor):
451
raise errors.CannotReverseCherrypick()
452
if self.merge_type.supports_cherrypick:
453
kwargs['cherrypick'] = (not self.base_is_ancestor or
454
not self.base_is_other_ancestor)
455
if self._is_criss_cross and getattr(self.merge_type,
456
'supports_lca_trees', False):
457
kwargs['lca_trees'] = self._lca_trees
458
return self.merge_type(pb=self._pb,
459
change_reporter=self.change_reporter,
462
def _do_merge_to(self, merge):
464
if self.recurse == 'down':
465
for relpath, file_id in self.this_tree.iter_references():
466
sub_tree = self.this_tree.get_nested_tree(file_id, relpath)
467
other_revision = self.other_tree.get_reference_revision(
469
if other_revision == sub_tree.last_revision():
471
sub_merge = Merger(sub_tree.branch, this_tree=sub_tree)
472
sub_merge.merge_type = self.merge_type
473
other_branch = self.other_branch.reference_parent(file_id, relpath)
474
sub_merge.set_other_revision(other_revision, other_branch)
475
base_revision = self.base_tree.get_reference_revision(file_id)
476
sub_merge.base_tree = \
477
sub_tree.branch.repository.revision_tree(base_revision)
478
sub_merge.base_rev_id = base_revision
482
self.this_tree.lock_tree_write()
484
if self.base_tree is not None:
485
self.base_tree.lock_read()
487
if self.other_tree is not None:
488
self.other_tree.lock_read()
490
merge = self.make_merger()
491
self._do_merge_to(merge)
493
if self.other_tree is not None:
494
self.other_tree.unlock()
496
if self.base_tree is not None:
497
self.base_tree.unlock()
499
self.this_tree.unlock()
500
if len(merge.cooked_conflicts) == 0:
501
if not self.ignore_zero and not is_quiet():
502
note("All changes applied successfully.")
504
note("%d conflicts encountered." % len(merge.cooked_conflicts))
506
return len(merge.cooked_conflicts)
509
class _InventoryNoneEntry(object):
510
"""This represents an inventory entry which *isn't there*.
512
It simplifies the merging logic if we always have an InventoryEntry, even
513
if it isn't actually present
520
symlink_target = None
523
_none_entry = _InventoryNoneEntry()
526
class Merge3Merger(object):
527
"""Three-way merger that uses the merge3 text merger"""
529
supports_reprocess = True
530
supports_show_base = True
531
history_based = False
532
supports_cherrypick = True
533
supports_reverse_cherrypick = True
534
winner_idx = {"this": 2, "other": 1, "conflict": 1}
535
supports_lca_trees = True
537
def __init__(self, working_tree, this_tree, base_tree, other_tree,
538
interesting_ids=None, reprocess=False, show_base=False,
539
pb=DummyProgress(), pp=None, change_reporter=None,
540
interesting_files=None, do_merge=True,
541
cherrypick=False, lca_trees=None):
542
"""Initialize the merger object and perform the merge.
544
:param working_tree: The working tree to apply the merge to
545
:param this_tree: The local tree in the merge operation
546
:param base_tree: The common tree in the merge operation
547
:param other_tree: The other other tree to merge changes from
548
:param interesting_ids: The file_ids of files that should be
549
participate in the merge. May not be combined with
551
:param: reprocess If True, perform conflict-reduction processing.
552
:param show_base: If True, show the base revision in text conflicts.
553
(incompatible with reprocess)
554
:param pb: A Progress bar
555
:param pp: A ProgressPhase object
556
:param change_reporter: An object that should report changes made
557
:param interesting_files: The tree-relative paths of files that should
558
participate in the merge. If these paths refer to directories,
559
the contents of those directories will also be included. May not
560
be combined with interesting_ids. If neither interesting_files nor
561
interesting_ids is specified, all files may participate in the
563
:param lca_trees: Can be set to a dictionary of {revision_id:rev_tree}
564
if the ancestry was found to include a criss-cross merge.
565
Otherwise should be None.
567
object.__init__(self)
568
if interesting_files is not None and interesting_ids is not None:
570
'specify either interesting_ids or interesting_files')
571
self.interesting_ids = interesting_ids
572
self.interesting_files = interesting_files
573
self.this_tree = working_tree
574
self.base_tree = base_tree
575
self.other_tree = other_tree
576
self._raw_conflicts = []
577
self.cooked_conflicts = []
578
self.reprocess = reprocess
579
self.show_base = show_base
580
self._lca_trees = lca_trees
581
# Uncommenting this will change the default algorithm to always use
582
# _entries_lca. This can be useful for running the test suite and
583
# making sure we haven't missed any corner cases.
584
# if lca_trees is None:
585
# self._lca_trees = [self.base_tree]
588
self.change_reporter = change_reporter
589
self.cherrypick = cherrypick
591
self.pp = ProgressPhase("Merge phase", 3, self.pb)
596
self.this_tree.lock_tree_write()
597
self.base_tree.lock_read()
598
self.other_tree.lock_read()
599
self.tt = TreeTransform(self.this_tree, self.pb)
602
self._compute_transform()
604
results = self.tt.apply(no_conflicts=True)
605
self.write_modified(results)
607
self.this_tree.add_conflicts(self.cooked_conflicts)
608
except UnsupportedOperation:
612
self.other_tree.unlock()
613
self.base_tree.unlock()
614
self.this_tree.unlock()
617
def make_preview_transform(self):
618
self.base_tree.lock_read()
619
self.other_tree.lock_read()
620
self.tt = TransformPreview(self.this_tree)
623
self._compute_transform()
626
self.other_tree.unlock()
627
self.base_tree.unlock()
631
def _compute_transform(self):
632
if self._lca_trees is None:
633
entries = self._entries3()
634
resolver = self._three_way
636
entries = self._entries_lca()
637
resolver = self._lca_multi_way
638
child_pb = ui.ui_factory.nested_progress_bar()
640
for num, (file_id, changed, parents3, names3,
641
executable3) in enumerate(entries):
642
child_pb.update('Preparing file merge', num, len(entries))
643
self._merge_names(file_id, parents3, names3, resolver=resolver)
645
file_status = self.merge_contents(file_id)
647
file_status = 'unmodified'
648
self._merge_executable(file_id,
649
executable3, file_status, resolver=resolver)
654
child_pb = ui.ui_factory.nested_progress_bar()
656
fs_conflicts = resolve_conflicts(self.tt, child_pb,
657
lambda t, c: conflict_pass(t, c, self.other_tree))
660
if self.change_reporter is not None:
661
from bzrlib import delta
662
delta.report_changes(
663
self.tt.iter_changes(), self.change_reporter)
664
self.cook_conflicts(fs_conflicts)
665
for conflict in self.cooked_conflicts:
669
"""Gather data about files modified between three trees.
671
Return a list of tuples of file_id, changed, parents3, names3,
672
executable3. changed is a boolean indicating whether the file contents
673
or kind were changed. parents3 is a tuple of parent ids for base,
674
other and this. names3 is a tuple of names for base, other and this.
675
executable3 is a tuple of execute-bit values for base, other and this.
678
iterator = self.other_tree.iter_changes(self.base_tree,
679
include_unchanged=True, specific_files=self.interesting_files,
680
extra_trees=[self.this_tree])
681
this_entries = dict((e.file_id, e) for p, e in
682
self.this_tree.iter_entries_by_dir(
683
self.interesting_ids))
684
for (file_id, paths, changed, versioned, parents, names, kind,
685
executable) in iterator:
686
if (self.interesting_ids is not None and
687
file_id not in self.interesting_ids):
689
entry = this_entries.get(file_id)
690
if entry is not None:
691
this_name = entry.name
692
this_parent = entry.parent_id
693
this_executable = entry.executable
697
this_executable = None
698
parents3 = parents + (this_parent,)
699
names3 = names + (this_name,)
700
executable3 = executable + (this_executable,)
701
result.append((file_id, changed, parents3, names3, executable3))
704
def _entries_lca(self):
705
"""Gather data about files modified between multiple trees.
707
This compares OTHER versus all LCA trees, and for interesting entries,
708
it then compares with THIS and BASE.
710
For the multi-valued entries, the format will be (BASE, [lca1, lca2])
711
:return: [(file_id, changed, parents, names, executable)]
712
file_id Simple file_id of the entry
713
changed Boolean, True if the kind or contents changed
715
parents ((base, [parent_id, in, lcas]), parent_id_other,
717
names ((base, [name, in, lcas]), name_in_other, name_in_this)
718
executable ((base, [exec, in, lcas]), exec_in_other, exec_in_this)
720
if self.interesting_files is not None:
721
lookup_trees = [self.this_tree, self.base_tree]
722
lookup_trees.extend(self._lca_trees)
723
# I think we should include the lca trees as well
724
interesting_ids = self.other_tree.paths2ids(self.interesting_files,
727
interesting_ids = self.interesting_ids
729
walker = _mod_tree.MultiWalker(self.other_tree, self._lca_trees)
731
base_inventory = self.base_tree.inventory
732
this_inventory = self.this_tree.inventory
733
for path, file_id, other_ie, lca_values in walker.iter_all():
734
# Is this modified at all from any of the other trees?
736
other_ie = _none_entry
737
if interesting_ids is not None and file_id not in interesting_ids:
740
# If other_revision is found in any of the lcas, that means this
741
# node is uninteresting. This is because when merging, if there are
742
# multiple heads(), we have to create a new node. So if we didn't,
743
# we know that the ancestry is linear, and that OTHER did not
745
# See doc/developers/lca_merge_resolution.txt for details
746
other_revision = other_ie.revision
747
if other_revision is not None:
748
# We can't use this shortcut when other_revision is None,
749
# because it may be None because things are WorkingTrees, and
750
# not because it is *actually* None.
751
is_unmodified = False
752
for lca_path, ie in lca_values:
753
if ie is not None and ie.revision == other_revision:
760
for lca_path, lca_ie in lca_values:
762
lca_entries.append(_none_entry)
764
lca_entries.append(lca_ie)
766
if file_id in base_inventory:
767
base_ie = base_inventory[file_id]
769
base_ie = _none_entry
771
if file_id in this_inventory:
772
this_ie = this_inventory[file_id]
774
this_ie = _none_entry
780
for lca_ie in lca_entries:
781
lca_kinds.append(lca_ie.kind)
782
lca_parent_ids.append(lca_ie.parent_id)
783
lca_names.append(lca_ie.name)
784
lca_executable.append(lca_ie.executable)
786
kind_winner = self._lca_multi_way(
787
(base_ie.kind, lca_kinds),
788
other_ie.kind, this_ie.kind)
789
parent_id_winner = self._lca_multi_way(
790
(base_ie.parent_id, lca_parent_ids),
791
other_ie.parent_id, this_ie.parent_id)
792
name_winner = self._lca_multi_way(
793
(base_ie.name, lca_names),
794
other_ie.name, this_ie.name)
796
content_changed = True
797
if kind_winner == 'this':
798
# No kind change in OTHER, see if there are *any* changes
799
if other_ie.kind == 'directory':
800
if parent_id_winner == 'this' and name_winner == 'this':
801
# No change for this directory in OTHER, skip
803
content_changed = False
804
elif other_ie.kind is None or other_ie.kind == 'file':
805
def get_sha1(ie, tree):
806
if ie.kind != 'file':
808
return tree.get_file_sha1(file_id)
809
base_sha1 = get_sha1(base_ie, self.base_tree)
810
lca_sha1s = [get_sha1(ie, tree) for ie, tree
811
in zip(lca_entries, self._lca_trees)]
812
this_sha1 = get_sha1(this_ie, self.this_tree)
813
other_sha1 = get_sha1(other_ie, self.other_tree)
814
sha1_winner = self._lca_multi_way(
815
(base_sha1, lca_sha1s), other_sha1, this_sha1,
816
allow_overriding_lca=False)
817
exec_winner = self._lca_multi_way(
818
(base_ie.executable, lca_executable),
819
other_ie.executable, this_ie.executable)
820
if (parent_id_winner == 'this' and name_winner == 'this'
821
and sha1_winner == 'this' and exec_winner == 'this'):
822
# No kind, parent, name, exec, or content change for
823
# OTHER, so this node is not considered interesting
825
if sha1_winner == 'this':
826
content_changed = False
827
elif other_ie.kind == 'symlink':
828
def get_target(ie, tree):
829
if ie.kind != 'symlink':
831
return tree.get_symlink_target(file_id)
832
base_target = get_target(base_ie, self.base_tree)
833
lca_targets = [get_target(ie, tree) for ie, tree
834
in zip(lca_entries, self._lca_trees)]
835
this_target = get_target(this_ie, self.this_tree)
836
other_target = get_target(other_ie, self.other_tree)
837
target_winner = self._lca_multi_way(
838
(base_target, lca_targets),
839
other_target, this_target)
840
if (parent_id_winner == 'this' and name_winner == 'this'
841
and target_winner == 'this'):
842
# No kind, parent, name, or symlink target change
845
if target_winner == 'this':
846
content_changed = False
847
elif other_ie.kind == 'tree-reference':
848
# The 'changed' information seems to be handled at a higher
849
# level. At least, _entries3 returns False for content
850
# changed, even when at a new revision_id.
851
content_changed = False
852
if (parent_id_winner == 'this' and name_winner == 'this'):
853
# Nothing interesting
856
raise AssertionError('unhandled kind: %s' % other_ie.kind)
857
# XXX: We need to handle kind == 'symlink'
859
# If we have gotten this far, that means something has changed
860
result.append((file_id, content_changed,
861
((base_ie.parent_id, lca_parent_ids),
862
other_ie.parent_id, this_ie.parent_id),
863
((base_ie.name, lca_names),
864
other_ie.name, this_ie.name),
865
((base_ie.executable, lca_executable),
866
other_ie.executable, this_ie.executable)
873
self.tt.final_kind(self.tt.root)
875
self.tt.cancel_deletion(self.tt.root)
876
if self.tt.final_file_id(self.tt.root) is None:
877
self.tt.version_file(self.tt.tree_file_id(self.tt.root),
879
other_root_file_id = self.other_tree.get_root_id()
880
if other_root_file_id is None:
882
other_root = self.tt.trans_id_file_id(other_root_file_id)
883
if other_root == self.tt.root:
886
self.tt.final_kind(other_root)
889
if self.other_tree.inventory.root.file_id in self.this_tree.inventory:
890
# the other tree's root is a non-root in the current tree
892
self.reparent_children(self.other_tree.inventory.root, self.tt.root)
893
self.tt.cancel_creation(other_root)
894
self.tt.cancel_versioning(other_root)
896
def reparent_children(self, ie, target):
897
for thing, child in ie.children.iteritems():
898
trans_id = self.tt.trans_id_file_id(child.file_id)
899
self.tt.adjust_path(self.tt.final_name(trans_id), target, trans_id)
901
def write_modified(self, results):
903
for path in results.modified_paths:
904
file_id = self.this_tree.path2id(self.this_tree.relpath(path))
907
hash = self.this_tree.get_file_sha1(file_id)
910
modified_hashes[file_id] = hash
911
self.this_tree.set_merge_modified(modified_hashes)
914
def parent(entry, file_id):
915
"""Determine the parent for a file_id (used as a key method)"""
918
return entry.parent_id
921
def name(entry, file_id):
922
"""Determine the name for a file_id (used as a key method)"""
928
def contents_sha1(tree, file_id):
929
"""Determine the sha1 of the file contents (used as a key method)."""
930
if file_id not in tree:
932
return tree.get_file_sha1(file_id)
935
def executable(tree, file_id):
936
"""Determine the executability of a file-id (used as a key method)."""
937
if file_id not in tree:
939
if tree.kind(file_id) != "file":
941
return tree.is_executable(file_id)
944
def kind(tree, file_id):
945
"""Determine the kind of a file-id (used as a key method)."""
946
if file_id not in tree:
948
return tree.kind(file_id)
951
def _three_way(base, other, this):
952
#if base == other, either they all agree, or only THIS has changed.
955
elif this not in (base, other):
957
# "Ambiguous clean merge" -- both sides have made the same change.
960
# this == base: only other has changed.
965
def _lca_multi_way(bases, other, this, allow_overriding_lca=True):
966
"""Consider LCAs when determining whether a change has occurred.
968
If LCAS are all identical, this is the same as a _three_way comparison.
970
:param bases: value in (BASE, [LCAS])
971
:param other: value in OTHER
972
:param this: value in THIS
973
:param allow_overriding_lca: If there is more than one unique lca
974
value, allow OTHER to override THIS if it has a new value, and
975
THIS only has an lca value, or vice versa. This is appropriate for
976
truly scalar values, not as much for non-scalars.
977
:return: 'this', 'other', or 'conflict' depending on whether an entry
980
# See doc/developers/lca_tree_merging.txt for details about this
983
# Either Ambiguously clean, or nothing was actually changed. We
986
base_val, lca_vals = bases
987
# Remove 'base_val' from the lca_vals, because it is not interesting
988
filtered_lca_vals = [lca_val for lca_val in lca_vals
989
if lca_val != base_val]
990
if len(filtered_lca_vals) == 0:
991
return Merge3Merger._three_way(base_val, other, this)
993
unique_lca_vals = set(filtered_lca_vals)
994
if len(unique_lca_vals) == 1:
995
return Merge3Merger._three_way(unique_lca_vals.pop(), other, this)
997
if allow_overriding_lca:
998
if other in unique_lca_vals:
999
if this in unique_lca_vals:
1000
# Each side picked a different lca, conflict
1003
# This has a value which supersedes both lca values, and
1004
# other only has an lca value
1006
elif this in unique_lca_vals:
1007
# OTHER has a value which supersedes both lca values, and this
1008
# only has an lca value
1011
# At this point, the lcas disagree, and the tips disagree
1015
def scalar_three_way(this_tree, base_tree, other_tree, file_id, key):
1016
"""Do a three-way test on a scalar.
1017
Return "this", "other" or "conflict", depending whether a value wins.
1019
key_base = key(base_tree, file_id)
1020
key_other = key(other_tree, file_id)
1021
#if base == other, either they all agree, or only THIS has changed.
1022
if key_base == key_other:
1024
key_this = key(this_tree, file_id)
1025
# "Ambiguous clean merge"
1026
if key_this == key_other:
1028
elif key_this == key_base:
1033
def merge_names(self, file_id):
1034
def get_entry(tree):
1035
if file_id in tree.inventory:
1036
return tree.inventory[file_id]
1039
this_entry = get_entry(self.this_tree)
1040
other_entry = get_entry(self.other_tree)
1041
base_entry = get_entry(self.base_tree)
1042
entries = (base_entry, other_entry, this_entry)
1045
for entry in entries:
1048
parents.append(None)
1050
names.append(entry.name)
1051
parents.append(entry.parent_id)
1052
return self._merge_names(file_id, parents, names,
1053
resolver=self._three_way)
1055
def _merge_names(self, file_id, parents, names, resolver):
1056
"""Perform a merge on file_id names and parents"""
1057
base_name, other_name, this_name = names
1058
base_parent, other_parent, this_parent = parents
1060
name_winner = resolver(*names)
1062
parent_id_winner = resolver(*parents)
1063
if this_name is None:
1064
if name_winner == "this":
1065
name_winner = "other"
1066
if parent_id_winner == "this":
1067
parent_id_winner = "other"
1068
if name_winner == "this" and parent_id_winner == "this":
1070
if name_winner == "conflict":
1071
trans_id = self.tt.trans_id_file_id(file_id)
1072
self._raw_conflicts.append(('name conflict', trans_id,
1073
this_name, other_name))
1074
if parent_id_winner == "conflict":
1075
trans_id = self.tt.trans_id_file_id(file_id)
1076
self._raw_conflicts.append(('parent conflict', trans_id,
1077
this_parent, other_parent))
1078
if other_name is None:
1079
# it doesn't matter whether the result was 'other' or
1080
# 'conflict'-- if there's no 'other', we leave it alone.
1082
# if we get here, name_winner and parent_winner are set to safe values.
1083
trans_id = self.tt.trans_id_file_id(file_id)
1084
parent_id = parents[self.winner_idx[parent_id_winner]]
1085
if parent_id is not None:
1086
parent_trans_id = self.tt.trans_id_file_id(parent_id)
1087
self.tt.adjust_path(names[self.winner_idx[name_winner]],
1088
parent_trans_id, trans_id)
1090
def merge_contents(self, file_id):
1091
"""Performs a merge on file_id contents."""
1092
def contents_pair(tree):
1093
if file_id not in tree:
1095
kind = tree.kind(file_id)
1097
contents = tree.get_file_sha1(file_id)
1098
elif kind == "symlink":
1099
contents = tree.get_symlink_target(file_id)
1102
return kind, contents
1104
def contents_conflict():
1105
trans_id = self.tt.trans_id_file_id(file_id)
1106
name = self.tt.final_name(trans_id)
1107
parent_id = self.tt.final_parent(trans_id)
1108
if file_id in self.this_tree.inventory:
1109
self.tt.unversion_file(trans_id)
1110
if file_id in self.this_tree:
1111
self.tt.delete_contents(trans_id)
1112
file_group = self._dump_conflicts(name, parent_id, file_id,
1114
self._raw_conflicts.append(('contents conflict', file_group))
1116
# See SPOT run. run, SPOT, run.
1117
# So we're not QUITE repeating ourselves; we do tricky things with
1119
base_pair = contents_pair(self.base_tree)
1120
other_pair = contents_pair(self.other_tree)
1122
this_pair = contents_pair(self.this_tree)
1123
lca_pairs = [contents_pair(tree) for tree in self._lca_trees]
1124
winner = self._lca_multi_way((base_pair, lca_pairs), other_pair,
1125
this_pair, allow_overriding_lca=False)
1127
if base_pair == other_pair:
1130
# We delayed evaluating this_pair as long as we can to avoid
1131
# unnecessary sha1 calculation
1132
this_pair = contents_pair(self.this_tree)
1133
winner = self._three_way(base_pair, other_pair, this_pair)
1134
if winner == 'this':
1135
# No interesting changes introduced by OTHER
1137
trans_id = self.tt.trans_id_file_id(file_id)
1138
if winner == 'other':
1139
# OTHER is a straight winner, so replace this contents with other
1140
file_in_this = file_id in self.this_tree
1142
# Remove any existing contents
1143
self.tt.delete_contents(trans_id)
1144
if file_id in self.other_tree:
1145
# OTHER changed the file
1146
create_from_tree(self.tt, trans_id,
1147
self.other_tree, file_id)
1148
if not file_in_this:
1149
self.tt.version_file(file_id, trans_id)
1152
# OTHER deleted the file
1153
self.tt.unversion_file(trans_id)
1156
# We have a hypothetical conflict, but if we have files, then we
1157
# can try to merge the content
1158
if this_pair[0] == 'file' and other_pair[0] == 'file':
1159
# THIS and OTHER are both files, so text merge. Either
1160
# BASE is a file, or both converted to files, so at least we
1161
# have agreement that output should be a file.
1163
self.text_merge(file_id, trans_id)
1165
return contents_conflict()
1166
if file_id not in self.this_tree:
1167
self.tt.version_file(file_id, trans_id)
1169
self.tt.tree_kind(trans_id)
1170
self.tt.delete_contents(trans_id)
1175
return contents_conflict()
1177
def get_lines(self, tree, file_id):
1178
"""Return the lines in a file, or an empty list."""
1180
return tree.get_file(file_id).readlines()
1184
def text_merge(self, file_id, trans_id):
1185
"""Perform a three-way text merge on a file_id"""
1186
# it's possible that we got here with base as a different type.
1187
# if so, we just want two-way text conflicts.
1188
if file_id in self.base_tree and \
1189
self.base_tree.kind(file_id) == "file":
1190
base_lines = self.get_lines(self.base_tree, file_id)
1193
other_lines = self.get_lines(self.other_tree, file_id)
1194
this_lines = self.get_lines(self.this_tree, file_id)
1195
m3 = Merge3(base_lines, this_lines, other_lines,
1196
is_cherrypick=self.cherrypick)
1197
start_marker = "!START OF MERGE CONFLICT!" + "I HOPE THIS IS UNIQUE"
1198
if self.show_base is True:
1199
base_marker = '|' * 7
1203
def iter_merge3(retval):
1204
retval["text_conflicts"] = False
1205
for line in m3.merge_lines(name_a = "TREE",
1206
name_b = "MERGE-SOURCE",
1207
name_base = "BASE-REVISION",
1208
start_marker=start_marker,
1209
base_marker=base_marker,
1210
reprocess=self.reprocess):
1211
if line.startswith(start_marker):
1212
retval["text_conflicts"] = True
1213
yield line.replace(start_marker, '<' * 7)
1217
merge3_iterator = iter_merge3(retval)
1218
self.tt.create_file(merge3_iterator, trans_id)
1219
if retval["text_conflicts"] is True:
1220
self._raw_conflicts.append(('text conflict', trans_id))
1221
name = self.tt.final_name(trans_id)
1222
parent_id = self.tt.final_parent(trans_id)
1223
file_group = self._dump_conflicts(name, parent_id, file_id,
1224
this_lines, base_lines,
1226
file_group.append(trans_id)
1228
def _dump_conflicts(self, name, parent_id, file_id, this_lines=None,
1229
base_lines=None, other_lines=None, set_version=False,
1231
"""Emit conflict files.
1232
If this_lines, base_lines, or other_lines are omitted, they will be
1233
determined automatically. If set_version is true, the .OTHER, .THIS
1234
or .BASE (in that order) will be created as versioned files.
1236
data = [('OTHER', self.other_tree, other_lines),
1237
('THIS', self.this_tree, this_lines)]
1239
data.append(('BASE', self.base_tree, base_lines))
1242
for suffix, tree, lines in data:
1244
trans_id = self._conflict_file(name, parent_id, tree, file_id,
1246
file_group.append(trans_id)
1247
if set_version and not versioned:
1248
self.tt.version_file(file_id, trans_id)
1252
def _conflict_file(self, name, parent_id, tree, file_id, suffix,
1254
"""Emit a single conflict file."""
1255
name = name + '.' + suffix
1256
trans_id = self.tt.create_path(name, parent_id)
1257
create_from_tree(self.tt, trans_id, tree, file_id, lines)
1260
def merge_executable(self, file_id, file_status):
1261
"""Perform a merge on the execute bit."""
1262
executable = [self.executable(t, file_id) for t in (self.base_tree,
1263
self.other_tree, self.this_tree)]
1264
self._merge_executable(file_id, executable, file_status,
1265
resolver=self._three_way)
1267
def _merge_executable(self, file_id, executable, file_status,
1269
"""Perform a merge on the execute bit."""
1270
base_executable, other_executable, this_executable = executable
1271
if file_status == "deleted":
1273
winner = resolver(*executable)
1274
if winner == "conflict":
1275
# There must be a None in here, if we have a conflict, but we
1276
# need executability since file status was not deleted.
1277
if self.executable(self.other_tree, file_id) is None:
1281
if winner == 'this' and file_status != "modified":
1283
trans_id = self.tt.trans_id_file_id(file_id)
1285
if self.tt.final_kind(trans_id) != "file":
1289
if winner == "this":
1290
executability = this_executable
1292
if file_id in self.other_tree:
1293
executability = other_executable
1294
elif file_id in self.this_tree:
1295
executability = this_executable
1296
elif file_id in self.base_tree:
1297
executability = base_executable
1298
if executability is not None:
1299
trans_id = self.tt.trans_id_file_id(file_id)
1300
self.tt.set_executability(executability, trans_id)
1302
def cook_conflicts(self, fs_conflicts):
1303
"""Convert all conflicts into a form that doesn't depend on trans_id"""
1304
from conflicts import Conflict
1306
self.cooked_conflicts.extend(cook_conflicts(fs_conflicts, self.tt))
1307
fp = FinalPaths(self.tt)
1308
for conflict in self._raw_conflicts:
1309
conflict_type = conflict[0]
1310
if conflict_type in ('name conflict', 'parent conflict'):
1311
trans_id = conflict[1]
1312
conflict_args = conflict[2:]
1313
if trans_id not in name_conflicts:
1314
name_conflicts[trans_id] = {}
1315
unique_add(name_conflicts[trans_id], conflict_type,
1317
if conflict_type == 'contents conflict':
1318
for trans_id in conflict[1]:
1319
file_id = self.tt.final_file_id(trans_id)
1320
if file_id is not None:
1322
path = fp.get_path(trans_id)
1323
for suffix in ('.BASE', '.THIS', '.OTHER'):
1324
if path.endswith(suffix):
1325
path = path[:-len(suffix)]
1327
c = Conflict.factory(conflict_type, path=path, file_id=file_id)
1328
self.cooked_conflicts.append(c)
1329
if conflict_type == 'text conflict':
1330
trans_id = conflict[1]
1331
path = fp.get_path(trans_id)
1332
file_id = self.tt.final_file_id(trans_id)
1333
c = Conflict.factory(conflict_type, path=path, file_id=file_id)
1334
self.cooked_conflicts.append(c)
1336
for trans_id, conflicts in name_conflicts.iteritems():
1338
this_parent, other_parent = conflicts['parent conflict']
1339
if this_parent == other_parent:
1340
raise AssertionError()
1342
this_parent = other_parent = \
1343
self.tt.final_file_id(self.tt.final_parent(trans_id))
1345
this_name, other_name = conflicts['name conflict']
1346
if this_name == other_name:
1347
raise AssertionError()
1349
this_name = other_name = self.tt.final_name(trans_id)
1350
other_path = fp.get_path(trans_id)
1351
if this_parent is not None and this_name is not None:
1352
this_parent_path = \
1353
fp.get_path(self.tt.trans_id_file_id(this_parent))
1354
this_path = pathjoin(this_parent_path, this_name)
1356
this_path = "<deleted>"
1357
file_id = self.tt.final_file_id(trans_id)
1358
c = Conflict.factory('path conflict', path=this_path,
1359
conflict_path=other_path, file_id=file_id)
1360
self.cooked_conflicts.append(c)
1361
self.cooked_conflicts.sort(key=Conflict.sort_key)
1364
class WeaveMerger(Merge3Merger):
1365
"""Three-way tree merger, text weave merger."""
1366
supports_reprocess = True
1367
supports_show_base = False
1368
supports_reverse_cherrypick = False
1369
history_based = True
1371
def _merged_lines(self, file_id):
1372
"""Generate the merged lines.
1373
There is no distinction between lines that are meant to contain <<<<<<<
1377
base = self.base_tree
1380
plan = self.this_tree.plan_file_merge(file_id, self.other_tree,
1382
if 'merge' in debug.debug_flags:
1384
trans_id = self.tt.trans_id_file_id(file_id)
1385
name = self.tt.final_name(trans_id) + '.plan'
1386
contents = ('%10s|%s' % l for l in plan)
1387
self.tt.new_file(name, self.tt.final_parent(trans_id), contents)
1388
textmerge = PlanWeaveMerge(plan, '<<<<<<< TREE\n',
1389
'>>>>>>> MERGE-SOURCE\n')
1390
return textmerge.merge_lines(self.reprocess)
1392
def text_merge(self, file_id, trans_id):
1393
"""Perform a (weave) text merge for a given file and file-id.
1394
If conflicts are encountered, .THIS and .OTHER files will be emitted,
1395
and a conflict will be noted.
1397
lines, conflicts = self._merged_lines(file_id)
1399
# Note we're checking whether the OUTPUT is binary in this case,
1400
# because we don't want to get into weave merge guts.
1401
check_text_lines(lines)
1402
self.tt.create_file(lines, trans_id)
1404
self._raw_conflicts.append(('text conflict', trans_id))
1405
name = self.tt.final_name(trans_id)
1406
parent_id = self.tt.final_parent(trans_id)
1407
file_group = self._dump_conflicts(name, parent_id, file_id,
1409
file_group.append(trans_id)
1412
class LCAMerger(WeaveMerger):
1414
def _merged_lines(self, file_id):
1415
"""Generate the merged lines.
1416
There is no distinction between lines that are meant to contain <<<<<<<
1420
base = self.base_tree
1423
plan = self.this_tree.plan_file_lca_merge(file_id, self.other_tree,
1425
if 'merge' in debug.debug_flags:
1427
trans_id = self.tt.trans_id_file_id(file_id)
1428
name = self.tt.final_name(trans_id) + '.plan'
1429
contents = ('%10s|%s' % l for l in plan)
1430
self.tt.new_file(name, self.tt.final_parent(trans_id), contents)
1431
textmerge = PlanWeaveMerge(plan, '<<<<<<< TREE\n',
1432
'>>>>>>> MERGE-SOURCE\n')
1433
return textmerge.merge_lines(self.reprocess)
1436
class Diff3Merger(Merge3Merger):
1437
"""Three-way merger using external diff3 for text merging"""
1439
def dump_file(self, temp_dir, name, tree, file_id):
1440
out_path = pathjoin(temp_dir, name)
1441
out_file = open(out_path, "wb")
1443
in_file = tree.get_file(file_id)
1444
for line in in_file:
1445
out_file.write(line)
1450
def text_merge(self, file_id, trans_id):
1451
"""Perform a diff3 merge using a specified file-id and trans-id.
1452
If conflicts are encountered, .BASE, .THIS. and .OTHER conflict files
1453
will be dumped, and a will be conflict noted.
1456
temp_dir = osutils.mkdtemp(prefix="bzr-")
1458
new_file = pathjoin(temp_dir, "new")
1459
this = self.dump_file(temp_dir, "this", self.this_tree, file_id)
1460
base = self.dump_file(temp_dir, "base", self.base_tree, file_id)
1461
other = self.dump_file(temp_dir, "other", self.other_tree, file_id)
1462
status = bzrlib.patch.diff3(new_file, this, base, other)
1463
if status not in (0, 1):
1464
raise BzrError("Unhandled diff3 exit code")
1465
f = open(new_file, 'rb')
1467
self.tt.create_file(f, trans_id)
1471
name = self.tt.final_name(trans_id)
1472
parent_id = self.tt.final_parent(trans_id)
1473
self._dump_conflicts(name, parent_id, file_id)
1474
self._raw_conflicts.append(('text conflict', trans_id))
1476
osutils.rmtree(temp_dir)
1479
def merge_inner(this_branch, other_tree, base_tree, ignore_zero=False,
1481
merge_type=Merge3Merger,
1482
interesting_ids=None,
1486
interesting_files=None,
1489
change_reporter=None):
1490
"""Primary interface for merging.
1492
typical use is probably
1493
'merge_inner(branch, branch.get_revision_tree(other_revision),
1494
branch.get_revision_tree(base_revision))'
1496
if this_tree is None:
1497
raise BzrError("bzrlib.merge.merge_inner requires a this_tree "
1498
"parameter as of bzrlib version 0.8.")
1499
merger = Merger(this_branch, other_tree, base_tree, this_tree=this_tree,
1500
pb=pb, change_reporter=change_reporter)
1501
merger.backup_files = backup_files
1502
merger.merge_type = merge_type
1503
merger.interesting_ids = interesting_ids
1504
merger.ignore_zero = ignore_zero
1505
if interesting_files:
1507
raise ValueError('Only supply interesting_ids'
1508
' or interesting_files')
1509
merger.interesting_files = interesting_files
1510
merger.show_base = show_base
1511
merger.reprocess = reprocess
1512
merger.other_rev_id = other_rev_id
1513
merger.other_basis = other_rev_id
1514
get_revision_id = getattr(base_tree, 'get_revision_id', None)
1515
if get_revision_id is None:
1516
get_revision_id = base_tree.last_revision
1517
merger.set_base_revision(get_revision_id(), this_branch)
1518
return merger.do_merge()
1520
def get_merge_type_registry():
1521
"""Merge type registry is in bzrlib.option to avoid circular imports.
1523
This method provides a sanctioned way to retrieve it.
1525
from bzrlib import option
1526
return option._merge_type_registry
1529
def _plan_annotate_merge(annotated_a, annotated_b, ancestors_a, ancestors_b):
1530
def status_a(revision, text):
1531
if revision in ancestors_b:
1532
return 'killed-b', text
1534
return 'new-a', text
1536
def status_b(revision, text):
1537
if revision in ancestors_a:
1538
return 'killed-a', text
1540
return 'new-b', text
1542
plain_a = [t for (a, t) in annotated_a]
1543
plain_b = [t for (a, t) in annotated_b]
1544
matcher = patiencediff.PatienceSequenceMatcher(None, plain_a, plain_b)
1545
blocks = matcher.get_matching_blocks()
1548
for ai, bi, l in blocks:
1549
# process all mismatched sections
1550
# (last mismatched section is handled because blocks always
1551
# includes a 0-length last block)
1552
for revision, text in annotated_a[a_cur:ai]:
1553
yield status_a(revision, text)
1554
for revision, text in annotated_b[b_cur:bi]:
1555
yield status_b(revision, text)
1556
# and now the matched section
1559
for text_a in plain_a[ai:a_cur]:
1560
yield "unchanged", text_a
1563
class _PlanMergeBase(object):
1565
def __init__(self, a_rev, b_rev, vf, key_prefix):
1568
:param a_rev: Revision-id of one revision to merge
1569
:param b_rev: Revision-id of the other revision to merge
1570
:param vf: A VersionedFiles containing both revisions
1571
:param key_prefix: A prefix for accessing keys in vf, typically
1577
self._last_lines = None
1578
self._last_lines_revision_id = None
1579
self._cached_matching_blocks = {}
1580
self._key_prefix = key_prefix
1581
self._precache_tip_lines()
1583
def _precache_tip_lines(self):
1584
lines = self.get_lines([self.a_rev, self.b_rev])
1585
self.lines_a = lines[self.a_rev]
1586
self.lines_b = lines[self.b_rev]
1588
def get_lines(self, revisions):
1589
"""Get lines for revisions from the backing VersionedFiles.
1591
:raises RevisionNotPresent: on absent texts.
1593
keys = [(self._key_prefix + (rev,)) for rev in revisions]
1595
for record in self.vf.get_record_stream(keys, 'unordered', True):
1596
if record.storage_kind == 'absent':
1597
raise errors.RevisionNotPresent(record.key, self.vf)
1598
result[record.key[-1]] = osutils.chunks_to_lines(
1599
record.get_bytes_as('chunked'))
1602
def plan_merge(self):
1603
"""Generate a 'plan' for merging the two revisions.
1605
This involves comparing their texts and determining the cause of
1606
differences. If text A has a line and text B does not, then either the
1607
line was added to text A, or it was deleted from B. Once the causes
1608
are combined, they are written out in the format described in
1609
VersionedFile.plan_merge
1611
blocks = self._get_matching_blocks(self.a_rev, self.b_rev)
1612
unique_a, unique_b = self._unique_lines(blocks)
1613
new_a, killed_b = self._determine_status(self.a_rev, unique_a)
1614
new_b, killed_a = self._determine_status(self.b_rev, unique_b)
1615
return self._iter_plan(blocks, new_a, killed_b, new_b, killed_a)
1617
def _iter_plan(self, blocks, new_a, killed_b, new_b, killed_a):
1620
for i, j, n in blocks:
1621
for a_index in range(last_i, i):
1622
if a_index in new_a:
1623
if a_index in killed_b:
1624
yield 'conflicted-a', self.lines_a[a_index]
1626
yield 'new-a', self.lines_a[a_index]
1628
yield 'killed-b', self.lines_a[a_index]
1629
for b_index in range(last_j, j):
1630
if b_index in new_b:
1631
if b_index in killed_a:
1632
yield 'conflicted-b', self.lines_b[b_index]
1634
yield 'new-b', self.lines_b[b_index]
1636
yield 'killed-a', self.lines_b[b_index]
1637
# handle common lines
1638
for a_index in range(i, i+n):
1639
yield 'unchanged', self.lines_a[a_index]
1643
def _get_matching_blocks(self, left_revision, right_revision):
1644
"""Return a description of which sections of two revisions match.
1646
See SequenceMatcher.get_matching_blocks
1648
cached = self._cached_matching_blocks.get((left_revision,
1650
if cached is not None:
1652
if self._last_lines_revision_id == left_revision:
1653
left_lines = self._last_lines
1654
right_lines = self.get_lines([right_revision])[right_revision]
1656
lines = self.get_lines([left_revision, right_revision])
1657
left_lines = lines[left_revision]
1658
right_lines = lines[right_revision]
1659
self._last_lines = right_lines
1660
self._last_lines_revision_id = right_revision
1661
matcher = patiencediff.PatienceSequenceMatcher(None, left_lines,
1663
return matcher.get_matching_blocks()
1665
def _unique_lines(self, matching_blocks):
1666
"""Analyse matching_blocks to determine which lines are unique
1668
:return: a tuple of (unique_left, unique_right), where the values are
1669
sets of line numbers of unique lines.
1675
for i, j, n in matching_blocks:
1676
unique_left.extend(range(last_i, i))
1677
unique_right.extend(range(last_j, j))
1680
return unique_left, unique_right
1683
def _subtract_plans(old_plan, new_plan):
1684
"""Remove changes from new_plan that came from old_plan.
1686
It is assumed that the difference between the old_plan and new_plan
1687
is their choice of 'b' text.
1689
All lines from new_plan that differ from old_plan are emitted
1690
verbatim. All lines from new_plan that match old_plan but are
1691
not about the 'b' revision are emitted verbatim.
1693
Lines that match and are about the 'b' revision are the lines we
1694
don't want, so we convert 'killed-b' -> 'unchanged', and 'new-b'
1695
is skipped entirely.
1697
matcher = patiencediff.PatienceSequenceMatcher(None, old_plan,
1700
for i, j, n in matcher.get_matching_blocks():
1701
for jj in range(last_j, j):
1703
for jj in range(j, j+n):
1704
plan_line = new_plan[jj]
1705
if plan_line[0] == 'new-b':
1707
elif plan_line[0] == 'killed-b':
1708
yield 'unchanged', plan_line[1]
1714
class _PlanMerge(_PlanMergeBase):
1715
"""Plan an annotate merge using on-the-fly annotation"""
1717
def __init__(self, a_rev, b_rev, vf, key_prefix):
1718
super(_PlanMerge, self).__init__(a_rev, b_rev, vf, key_prefix)
1719
self.a_key = self._key_prefix + (self.a_rev,)
1720
self.b_key = self._key_prefix + (self.b_rev,)
1721
self.graph = Graph(self.vf)
1722
heads = self.graph.heads((self.a_key, self.b_key))
1724
# one side dominates, so we can just return its values, yay for
1726
# Ideally we would know that before we get this far
1727
self._head_key = heads.pop()
1728
if self._head_key == self.a_key:
1732
mutter('found dominating revision for %s\n%s > %s', self.vf,
1733
self._head_key[-1], other)
1736
self._head_key = None
1739
def _precache_tip_lines(self):
1740
# Turn this into a no-op, because we will do this later
1743
def _find_recursive_lcas(self):
1744
"""Find all the ancestors back to a unique lca"""
1745
cur_ancestors = (self.a_key, self.b_key)
1746
# graph.find_lca(uncommon, keys) now returns plain NULL_REVISION,
1747
# rather than a key tuple. We will just map that directly to no common
1751
next_lcas = self.graph.find_lca(*cur_ancestors)
1752
# Map a plain NULL_REVISION to a simple no-ancestors
1753
if next_lcas == set([NULL_REVISION]):
1755
# Order the lca's based on when they were merged into the tip
1756
# While the actual merge portion of weave merge uses a set() of
1757
# active revisions, the order of insertion *does* effect the
1758
# implicit ordering of the texts.
1759
for rev_key in cur_ancestors:
1760
ordered_parents = tuple(self.graph.find_merge_order(rev_key,
1762
parent_map[rev_key] = ordered_parents
1763
if len(next_lcas) == 0:
1765
elif len(next_lcas) == 1:
1766
parent_map[list(next_lcas)[0]] = ()
1768
elif len(next_lcas) > 2:
1769
# More than 2 lca's, fall back to grabbing all nodes between
1770
# this and the unique lca.
1771
mutter('More than 2 LCAs, falling back to all nodes for:'
1772
' %s, %s\n=> %s', self.a_key, self.b_key, cur_ancestors)
1773
cur_lcas = next_lcas
1774
while len(cur_lcas) > 1:
1775
cur_lcas = self.graph.find_lca(*cur_lcas)
1776
if len(cur_lcas) == 0:
1777
# No common base to find, use the full ancestry
1780
unique_lca = list(cur_lcas)[0]
1781
if unique_lca == NULL_REVISION:
1782
# find_lca will return a plain 'NULL_REVISION' rather
1783
# than a key tuple when there is no common ancestor, we
1784
# prefer to just use None, because it doesn't confuse
1785
# _get_interesting_texts()
1787
parent_map.update(self._find_unique_parents(next_lcas,
1790
cur_ancestors = next_lcas
1793
def _find_unique_parents(self, tip_keys, base_key):
1794
"""Find ancestors of tip that aren't ancestors of base.
1796
:param tip_keys: Nodes that are interesting
1797
:param base_key: Cull all ancestors of this node
1798
:return: The parent map for all revisions between tip_keys and
1799
base_key. base_key will be included. References to nodes outside of
1800
the ancestor set will also be removed.
1802
# TODO: this would be simpler if find_unique_ancestors took a list
1803
# instead of a single tip, internally it supports it, but it
1804
# isn't a "backwards compatible" api change.
1805
if base_key is None:
1806
parent_map = dict(self.graph.iter_ancestry(tip_keys))
1807
# We remove NULL_REVISION because it isn't a proper tuple key, and
1808
# thus confuses things like _get_interesting_texts, and our logic
1809
# to add the texts into the memory weave.
1810
if NULL_REVISION in parent_map:
1811
parent_map.pop(NULL_REVISION)
1814
for tip in tip_keys:
1816
self.graph.find_unique_ancestors(tip, [base_key]))
1817
parent_map = self.graph.get_parent_map(interesting)
1818
parent_map[base_key] = ()
1819
culled_parent_map, child_map, tails = self._remove_external_references(
1821
# Remove all the tails but base_key
1822
if base_key is not None:
1823
tails.remove(base_key)
1824
self._prune_tails(culled_parent_map, child_map, tails)
1825
# Now remove all the uninteresting 'linear' regions
1826
simple_map = _mod_graph.collapse_linear_regions(culled_parent_map)
1830
def _remove_external_references(parent_map):
1831
"""Remove references that go outside of the parent map.
1833
:param parent_map: Something returned from Graph.get_parent_map(keys)
1834
:return: (filtered_parent_map, child_map, tails)
1835
filtered_parent_map is parent_map without external references
1836
child_map is the {parent_key: [child_keys]} mapping
1837
tails is a list of nodes that do not have any parents in the map
1839
# TODO: The basic effect of this function seems more generic than
1840
# _PlanMerge. But the specific details of building a child_map,
1841
# and computing tails seems very specific to _PlanMerge.
1842
# Still, should this be in Graph land?
1843
filtered_parent_map = {}
1846
for key, parent_keys in parent_map.iteritems():
1847
culled_parent_keys = [p for p in parent_keys if p in parent_map]
1848
if not culled_parent_keys:
1850
for parent_key in culled_parent_keys:
1851
child_map.setdefault(parent_key, []).append(key)
1852
# TODO: Do we want to do this, it adds overhead for every node,
1853
# just to say that the node has no children
1854
child_map.setdefault(key, [])
1855
filtered_parent_map[key] = culled_parent_keys
1856
return filtered_parent_map, child_map, tails
1859
def _prune_tails(parent_map, child_map, tails_to_remove):
1860
"""Remove tails from the parent map.
1862
This will remove the supplied revisions until no more children have 0
1865
:param parent_map: A dict of {child: [parents]}, this dictionary will
1866
be modified in place.
1867
:param tails_to_remove: A list of tips that should be removed,
1868
this list will be consumed
1869
:param child_map: The reverse dict of parent_map ({parent: [children]})
1870
this dict will be modified
1871
:return: None, parent_map will be modified in place.
1873
while tails_to_remove:
1874
next = tails_to_remove.pop()
1875
parent_map.pop(next)
1876
children = child_map.pop(next)
1877
for child in children:
1878
child_parents = parent_map[child]
1879
child_parents.remove(next)
1880
if len(child_parents) == 0:
1881
tails_to_remove.append(child)
1883
def _get_interesting_texts(self, parent_map):
1884
"""Return a dict of texts we are interested in.
1886
Note that the input is in key tuples, but the output is in plain
1889
:param parent_map: The output from _find_recursive_lcas
1890
:return: A dict of {'revision_id':lines} as returned by
1891
_PlanMergeBase.get_lines()
1893
all_revision_keys = set(parent_map)
1894
all_revision_keys.add(self.a_key)
1895
all_revision_keys.add(self.b_key)
1897
# Everything else is in 'keys' but get_lines is in 'revision_ids'
1898
all_texts = self.get_lines([k[-1] for k in all_revision_keys])
1901
def _build_weave(self):
1902
from bzrlib import weave
1903
self._weave = weave.Weave(weave_name='in_memory_weave',
1904
allow_reserved=True)
1905
parent_map = self._find_recursive_lcas()
1907
all_texts = self._get_interesting_texts(parent_map)
1909
# Note: Unfortunately, the order given by topo_sort will effect the
1910
# ordering resolution in the output. Specifically, if you add A then B,
1911
# then in the output text A lines will show up before B lines. And, of
1912
# course, topo_sort doesn't guarantee any real ordering.
1913
# So we use merge_sort, and add a fake node on the tip.
1914
# This ensures that left-hand parents will always be inserted into the
1915
# weave before right-hand parents.
1916
tip_key = self._key_prefix + (_mod_revision.CURRENT_REVISION,)
1917
parent_map[tip_key] = (self.a_key, self.b_key)
1919
for seq_num, key, depth, eom in reversed(tsort.merge_sort(parent_map,
1923
# for key in tsort.topo_sort(parent_map):
1924
parent_keys = parent_map[key]
1925
revision_id = key[-1]
1926
parent_ids = [k[-1] for k in parent_keys]
1927
self._weave.add_lines(revision_id, parent_ids,
1928
all_texts[revision_id])
1930
def plan_merge(self):
1931
"""Generate a 'plan' for merging the two revisions.
1933
This involves comparing their texts and determining the cause of
1934
differences. If text A has a line and text B does not, then either the
1935
line was added to text A, or it was deleted from B. Once the causes
1936
are combined, they are written out in the format described in
1937
VersionedFile.plan_merge
1939
if self._head_key is not None: # There was a single head
1940
if self._head_key == self.a_key:
1943
if self._head_key != self.b_key:
1944
raise AssertionError('There was an invalid head: %s != %s'
1945
% (self.b_key, self._head_key))
1947
head_rev = self._head_key[-1]
1948
lines = self.get_lines([head_rev])[head_rev]
1949
return ((plan, line) for line in lines)
1950
return self._weave.plan_merge(self.a_rev, self.b_rev)
1953
class _PlanLCAMerge(_PlanMergeBase):
1955
This merge algorithm differs from _PlanMerge in that:
1956
1. comparisons are done against LCAs only
1957
2. cases where a contested line is new versus one LCA but old versus
1958
another are marked as conflicts, by emitting the line as conflicted-a
1961
This is faster, and hopefully produces more useful output.
1964
def __init__(self, a_rev, b_rev, vf, key_prefix, graph):
1965
_PlanMergeBase.__init__(self, a_rev, b_rev, vf, key_prefix)
1966
lcas = graph.find_lca(key_prefix + (a_rev,), key_prefix + (b_rev,))
1969
if lca == NULL_REVISION:
1972
self.lcas.add(lca[-1])
1973
for lca in self.lcas:
1974
if _mod_revision.is_null(lca):
1977
lca_lines = self.get_lines([lca])[lca]
1978
matcher = patiencediff.PatienceSequenceMatcher(None, self.lines_a,
1980
blocks = list(matcher.get_matching_blocks())
1981
self._cached_matching_blocks[(a_rev, lca)] = blocks
1982
matcher = patiencediff.PatienceSequenceMatcher(None, self.lines_b,
1984
blocks = list(matcher.get_matching_blocks())
1985
self._cached_matching_blocks[(b_rev, lca)] = blocks
1987
def _determine_status(self, revision_id, unique_line_numbers):
1988
"""Determines the status unique lines versus all lcas.
1990
Basically, determines why the line is unique to this revision.
1992
A line may be determined new, killed, or both.
1994
If a line is determined new, that means it was not present in at least
1995
one LCA, and is not present in the other merge revision.
1997
If a line is determined killed, that means the line was present in
2000
If a line is killed and new, this indicates that the two merge
2001
revisions contain differing conflict resolutions.
2002
:param revision_id: The id of the revision in which the lines are
2004
:param unique_line_numbers: The line numbers of unique lines.
2005
:return a tuple of (new_this, killed_other):
2009
unique_line_numbers = set(unique_line_numbers)
2010
for lca in self.lcas:
2011
blocks = self._get_matching_blocks(revision_id, lca)
2012
unique_vs_lca, _ignored = self._unique_lines(blocks)
2013
new.update(unique_line_numbers.intersection(unique_vs_lca))
2014
killed.update(unique_line_numbers.difference(unique_vs_lca))
added
removed
bzrlib/merge.py
