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from bzrlib.merge_core import merge_flex, ApplyMerge3, BackupBeforeChange
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from bzrlib.changeset import generate_changeset, ExceptionConflictHandler
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from bzrlib.changeset import Inventory, Diff3Merge
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from bzrlib import find_branch
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from bzrlib.errors import BzrCommandError
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from bzrlib.delta 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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# comments from abentley on irc: merge happens in two stages, each
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# of which generates a changeset object
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# stage 1: generate OLD->OTHER,
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# stage 2: use MINE and OLD->OTHER to generate MINE -> RESULT
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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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This subclasses ExceptionConflictHandler, so that any types of
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conflict that are not explicitly handled cause an exception and
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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 dump(self, lines, 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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d_file = file(dest, "wb")
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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_lines, other_lines):
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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.dump(base_lines, this_path+".BASE")
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self.dump(other_lines, 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 new_contents_conflict(self, filename, other_contents):
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"""Conflicting contents for newly added file."""
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self.copy(other_contents, filename + ".OTHER")
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self.conflict("Conflict in newly added file %s" % filename)
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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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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 file_exists(tree, file_id):
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return tree.has_filename(tree.id2path(file_id))
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class MergeTree(object):
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def __init__(self, tree, tempdir):
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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.tempdir = tempdir
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os.mkdir(os.path.join(self.tempdir, "texts"))
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return self.tree.__iter__()
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def __contains__(self, file_id):
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return file_id in self.tree
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def get_file(self, file_id):
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return self.tree.get_file(file_id)
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def get_file_sha1(self, id):
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return self.tree.get_file_sha1(id)
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def id2path(self, file_id):
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return self.tree.id2path(file_id)
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def has_id(self, file_id):
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return self.tree.has_id(file_id)
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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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this_dir=None, backup_files=False, merge_type=ApplyMerge3,
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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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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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from_tree.lock_tree_write()
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this_branch = find_branch(this_dir)
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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=None, change_reporter=None,
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recurse='down', revision_graph=None):
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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 cache_trees_with_revision_ids(self, trees):
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"""Cache any tree in trees if it has a revision_id."""
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for maybe_tree in trees:
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if maybe_tree is None:
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rev_id = maybe_tree.get_revision_id()
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except AttributeError:
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self._cached_trees[rev_id] = maybe_tree
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def revision_graph(self):
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if self._revision_graph is None:
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self._revision_graph = self.this_branch.repository.get_graph()
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return self._revision_graph
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def _set_base_is_ancestor(self, value):
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self._base_is_ancestor = value
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def _get_base_is_ancestor(self):
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if self._base_is_ancestor is None:
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self._base_is_ancestor = self.revision_graph.is_ancestor(
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self.base_rev_id, self.this_basis)
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return self._base_is_ancestor
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base_is_ancestor = property(_get_base_is_ancestor, _set_base_is_ancestor)
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def _set_base_is_other_ancestor(self, value):
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self._base_is_other_ancestor = value
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def _get_base_is_other_ancestor(self):
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if self._base_is_other_ancestor is None:
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if self.other_basis is None:
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self._base_is_other_ancestor = self.revision_graph.is_ancestor(
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self.base_rev_id, self.other_basis)
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return self._base_is_other_ancestor
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base_is_other_ancestor = property(_get_base_is_other_ancestor,
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_set_base_is_other_ancestor)
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def from_uncommitted(tree, other_tree, pb=None, base_tree=None):
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"""Return a Merger for uncommitted changes in other_tree.
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:param tree: The tree to merge into
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:param other_tree: The tree to get uncommitted changes from
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:param pb: A progress indicator
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:param base_tree: The basis to use for the merge. If unspecified,
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other_tree.basis_tree() will be used.
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if base_tree is None:
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base_tree = other_tree.basis_tree()
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merger = Merger(tree.branch, other_tree, base_tree, tree, pb)
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merger.base_rev_id = merger.base_tree.get_revision_id()
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merger.other_rev_id = None
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merger.other_basis = merger.base_rev_id
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def from_mergeable(klass, tree, mergeable, pb):
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"""Return a Merger for a bundle or merge directive.
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:param tree: The tree to merge changes into
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:param mergeable: A merge directive or bundle
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:param pb: A progress indicator
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mergeable.install_revisions(tree.branch.repository)
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base_revision_id, other_revision_id, verified =\
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mergeable.get_merge_request(tree.branch.repository)
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revision_graph = tree.branch.repository.get_graph()
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if base_revision_id is not None:
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if (base_revision_id != _mod_revision.NULL_REVISION and
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revision_graph.is_ancestor(
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base_revision_id, tree.branch.last_revision())):
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base_revision_id = None
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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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if other_basis_tree.has_changes(self.other_tree):
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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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if not self.this_tree.has_changes(basis_tree):
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self.this_rev_id = self.this_basis
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def set_interesting_files(self, file_list):
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self.interesting_files = file_list
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def set_pending(self):
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if not self.base_is_ancestor or not self.base_is_other_ancestor 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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if file_list is None:
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interesting_ids = None
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interesting_ids = set()
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this_tree = this_branch.working_tree()
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for fname in file_list:
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path = this_branch.relpath(fname)
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for tree in (this_tree, base_tree.tree, other_tree.tree):
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file_id = tree.inventory.path2id(path)
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base_branch, self.base_tree = self._get_tree(base_revision)
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if base_revision[1] == -1:
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self.base_rev_id = base_branch.last_revision()
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elif base_revision[1] is None:
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self.base_rev_id = _mod_revision.NULL_REVISION
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self.base_rev_id = _mod_revision.ensure_null(
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base_branch.get_rev_id(base_revision[1]))
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self._maybe_fetch(base_branch, self.this_branch, self.base_rev_id)
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def make_merger(self):
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kwargs = {'working_tree':self.this_tree, 'this_tree': self.this_tree,
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'other_tree': self.other_tree,
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'interesting_ids': self.interesting_ids,
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'interesting_files': self.interesting_files,
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if self.merge_type.requires_base:
453
kwargs['base_tree'] = self.base_tree
454
if self.merge_type.supports_reprocess:
455
kwargs['reprocess'] = self.reprocess
457
raise BzrError("Conflict reduction is not supported for merge"
458
" type %s." % self.merge_type)
459
if self.merge_type.supports_show_base:
460
kwargs['show_base'] = self.show_base
462
raise BzrError("Showing base is not supported for this"
463
" merge type. %s" % self.merge_type)
464
if (not getattr(self.merge_type, 'supports_reverse_cherrypick', True)
465
and not self.base_is_other_ancestor):
466
raise errors.CannotReverseCherrypick()
467
if self.merge_type.supports_cherrypick:
468
kwargs['cherrypick'] = (not self.base_is_ancestor or
469
not self.base_is_other_ancestor)
470
if self._is_criss_cross and getattr(self.merge_type,
471
'supports_lca_trees', False):
472
kwargs['lca_trees'] = self._lca_trees
473
return self.merge_type(pb=self._pb,
474
change_reporter=self.change_reporter,
477
def _do_merge_to(self, merge):
478
if self.other_branch is not None:
479
self.other_branch.update_references(self.this_branch)
481
if self.recurse == 'down':
482
for relpath, file_id in self.this_tree.iter_references():
483
sub_tree = self.this_tree.get_nested_tree(file_id, relpath)
484
other_revision = self.other_tree.get_reference_revision(
486
if other_revision == sub_tree.last_revision():
488
sub_merge = Merger(sub_tree.branch, this_tree=sub_tree)
489
sub_merge.merge_type = self.merge_type
490
other_branch = self.other_branch.reference_parent(file_id, relpath)
491
sub_merge.set_other_revision(other_revision, other_branch)
492
base_revision = self.base_tree.get_reference_revision(file_id)
493
sub_merge.base_tree = \
494
sub_tree.branch.repository.revision_tree(base_revision)
495
sub_merge.base_rev_id = base_revision
499
self.this_tree.lock_tree_write()
501
if self.base_tree is not None:
502
self.base_tree.lock_read()
504
if self.other_tree is not None:
505
self.other_tree.lock_read()
507
merge = self.make_merger()
508
self._do_merge_to(merge)
510
if self.other_tree is not None:
511
self.other_tree.unlock()
513
if self.base_tree is not None:
514
self.base_tree.unlock()
516
self.this_tree.unlock()
517
if len(merge.cooked_conflicts) == 0:
518
if not self.ignore_zero and not is_quiet():
519
note("All changes applied successfully.")
521
note("%d conflicts encountered." % len(merge.cooked_conflicts))
523
return len(merge.cooked_conflicts)
526
class _InventoryNoneEntry(object):
527
"""This represents an inventory entry which *isn't there*.
529
It simplifies the merging logic if we always have an InventoryEntry, even
530
if it isn't actually present
537
symlink_target = None
540
_none_entry = _InventoryNoneEntry()
543
class Merge3Merger(object):
544
"""Three-way merger that uses the merge3 text merger"""
546
supports_reprocess = True
547
supports_show_base = True
548
history_based = False
549
supports_cherrypick = True
550
supports_reverse_cherrypick = True
551
winner_idx = {"this": 2, "other": 1, "conflict": 1}
552
supports_lca_trees = True
554
def __init__(self, working_tree, this_tree, base_tree, other_tree,
555
interesting_ids=None, reprocess=False, show_base=False,
556
pb=DummyProgress(), pp=None, change_reporter=None,
557
interesting_files=None, do_merge=True,
558
cherrypick=False, lca_trees=None):
559
"""Initialize the merger object and perform the merge.
561
:param working_tree: The working tree to apply the merge to
562
:param this_tree: The local tree in the merge operation
563
:param base_tree: The common tree in the merge operation
564
:param other_tree: The other tree to merge changes from
565
:param interesting_ids: The file_ids of files that should be
566
participate in the merge. May not be combined with
568
:param: reprocess If True, perform conflict-reduction processing.
569
:param show_base: If True, show the base revision in text conflicts.
570
(incompatible with reprocess)
571
:param pb: A Progress bar
572
:param pp: A ProgressPhase object
573
:param change_reporter: An object that should report changes made
574
:param interesting_files: The tree-relative paths of files that should
575
participate in the merge. If these paths refer to directories,
576
the contents of those directories will also be included. May not
577
be combined with interesting_ids. If neither interesting_files nor
578
interesting_ids is specified, all files may participate in the
580
:param lca_trees: Can be set to a dictionary of {revision_id:rev_tree}
581
if the ancestry was found to include a criss-cross merge.
582
Otherwise should be None.
584
object.__init__(self)
585
if interesting_files is not None and interesting_ids is not None:
587
'specify either interesting_ids or interesting_files')
588
self.interesting_ids = interesting_ids
589
self.interesting_files = interesting_files
590
self.this_tree = working_tree
591
self.base_tree = base_tree
592
self.other_tree = other_tree
593
self._raw_conflicts = []
594
self.cooked_conflicts = []
595
self.reprocess = reprocess
596
self.show_base = show_base
597
self._lca_trees = lca_trees
598
# Uncommenting this will change the default algorithm to always use
599
# _entries_lca. This can be useful for running the test suite and
600
# making sure we haven't missed any corner cases.
601
# if lca_trees is None:
602
# self._lca_trees = [self.base_tree]
605
self.change_reporter = change_reporter
606
self.cherrypick = cherrypick
608
self.pp = ProgressPhase("Merge phase", 3, self.pb)
613
self.this_tree.lock_tree_write()
614
self.base_tree.lock_read()
615
self.other_tree.lock_read()
617
self.tt = TreeTransform(self.this_tree, self.pb)
620
self._compute_transform()
622
results = self.tt.apply(no_conflicts=True)
623
self.write_modified(results)
625
self.this_tree.add_conflicts(self.cooked_conflicts)
626
except UnsupportedOperation:
631
self.other_tree.unlock()
632
self.base_tree.unlock()
633
self.this_tree.unlock()
636
def make_preview_transform(self):
637
self.base_tree.lock_read()
638
self.other_tree.lock_read()
639
self.tt = TransformPreview(self.this_tree)
642
self._compute_transform()
645
self.other_tree.unlock()
646
self.base_tree.unlock()
650
def _compute_transform(self):
651
if self._lca_trees is None:
652
entries = self._entries3()
653
resolver = self._three_way
655
entries = self._entries_lca()
656
resolver = self._lca_multi_way
657
child_pb = ui.ui_factory.nested_progress_bar()
659
for num, (file_id, changed, parents3, names3,
660
executable3) in enumerate(entries):
661
child_pb.update('Preparing file merge', num, len(entries))
662
self._merge_names(file_id, parents3, names3, resolver=resolver)
664
file_status = self.merge_contents(file_id)
666
file_status = 'unmodified'
667
self._merge_executable(file_id,
668
executable3, file_status, resolver=resolver)
673
child_pb = ui.ui_factory.nested_progress_bar()
675
fs_conflicts = resolve_conflicts(self.tt, child_pb,
676
lambda t, c: conflict_pass(t, c, self.other_tree))
679
if self.change_reporter is not None:
680
from bzrlib import delta
681
delta.report_changes(
682
self.tt.iter_changes(), self.change_reporter)
683
self.cook_conflicts(fs_conflicts)
684
for conflict in self.cooked_conflicts:
688
"""Gather data about files modified between three trees.
690
Return a list of tuples of file_id, changed, parents3, names3,
691
executable3. changed is a boolean indicating whether the file contents
692
or kind were changed. parents3 is a tuple of parent ids for base,
693
other and this. names3 is a tuple of names for base, other and this.
694
executable3 is a tuple of execute-bit values for base, other and this.
697
iterator = self.other_tree.iter_changes(self.base_tree,
698
include_unchanged=True, specific_files=self.interesting_files,
699
extra_trees=[self.this_tree])
700
this_entries = dict((e.file_id, e) for p, e in
701
self.this_tree.iter_entries_by_dir(
702
self.interesting_ids))
703
for (file_id, paths, changed, versioned, parents, names, kind,
704
executable) in iterator:
705
if (self.interesting_ids is not None and
706
file_id not in self.interesting_ids):
708
entry = this_entries.get(file_id)
709
if entry is not None:
710
this_name = entry.name
711
this_parent = entry.parent_id
712
this_executable = entry.executable
716
this_executable = None
717
parents3 = parents + (this_parent,)
718
names3 = names + (this_name,)
719
executable3 = executable + (this_executable,)
720
result.append((file_id, changed, parents3, names3, executable3))
723
def _entries_lca(self):
724
"""Gather data about files modified between multiple trees.
726
This compares OTHER versus all LCA trees, and for interesting entries,
727
it then compares with THIS and BASE.
729
For the multi-valued entries, the format will be (BASE, [lca1, lca2])
730
:return: [(file_id, changed, parents, names, executable)]
731
file_id Simple file_id of the entry
732
changed Boolean, True if the kind or contents changed
734
parents ((base, [parent_id, in, lcas]), parent_id_other,
736
names ((base, [name, in, lcas]), name_in_other, name_in_this)
737
executable ((base, [exec, in, lcas]), exec_in_other, exec_in_this)
739
if self.interesting_files is not None:
740
lookup_trees = [self.this_tree, self.base_tree]
741
lookup_trees.extend(self._lca_trees)
742
# I think we should include the lca trees as well
743
interesting_ids = self.other_tree.paths2ids(self.interesting_files,
746
interesting_ids = self.interesting_ids
748
walker = _mod_tree.MultiWalker(self.other_tree, self._lca_trees)
750
base_inventory = self.base_tree.inventory
751
this_inventory = self.this_tree.inventory
752
for path, file_id, other_ie, lca_values in walker.iter_all():
753
# Is this modified at all from any of the other trees?
755
other_ie = _none_entry
756
if interesting_ids is not None and file_id not in interesting_ids:
759
# If other_revision is found in any of the lcas, that means this
760
# node is uninteresting. This is because when merging, if there are
761
# multiple heads(), we have to create a new node. So if we didn't,
762
# we know that the ancestry is linear, and that OTHER did not
764
# See doc/developers/lca_merge_resolution.txt for details
765
other_revision = other_ie.revision
766
if other_revision is not None:
767
# We can't use this shortcut when other_revision is None,
768
# because it may be None because things are WorkingTrees, and
769
# not because it is *actually* None.
770
is_unmodified = False
771
for lca_path, ie in lca_values:
772
if ie is not None and ie.revision == other_revision:
779
for lca_path, lca_ie in lca_values:
781
lca_entries.append(_none_entry)
783
lca_entries.append(lca_ie)
785
if file_id in base_inventory:
786
base_ie = base_inventory[file_id]
788
base_ie = _none_entry
790
if file_id in this_inventory:
791
this_ie = this_inventory[file_id]
793
this_ie = _none_entry
799
for lca_ie in lca_entries:
800
lca_kinds.append(lca_ie.kind)
801
lca_parent_ids.append(lca_ie.parent_id)
802
lca_names.append(lca_ie.name)
803
lca_executable.append(lca_ie.executable)
805
kind_winner = self._lca_multi_way(
806
(base_ie.kind, lca_kinds),
807
other_ie.kind, this_ie.kind)
808
parent_id_winner = self._lca_multi_way(
809
(base_ie.parent_id, lca_parent_ids),
810
other_ie.parent_id, this_ie.parent_id)
811
name_winner = self._lca_multi_way(
812
(base_ie.name, lca_names),
813
other_ie.name, this_ie.name)
815
content_changed = True
816
if kind_winner == 'this':
817
# No kind change in OTHER, see if there are *any* changes
818
if other_ie.kind == 'directory':
819
if parent_id_winner == 'this' and name_winner == 'this':
820
# No change for this directory in OTHER, skip
822
content_changed = False
823
elif other_ie.kind is None or other_ie.kind == 'file':
824
def get_sha1(ie, tree):
825
if ie.kind != 'file':
827
return tree.get_file_sha1(file_id)
828
base_sha1 = get_sha1(base_ie, self.base_tree)
829
lca_sha1s = [get_sha1(ie, tree) for ie, tree
830
in zip(lca_entries, self._lca_trees)]
831
this_sha1 = get_sha1(this_ie, self.this_tree)
832
other_sha1 = get_sha1(other_ie, self.other_tree)
833
sha1_winner = self._lca_multi_way(
834
(base_sha1, lca_sha1s), other_sha1, this_sha1,
835
allow_overriding_lca=False)
836
exec_winner = self._lca_multi_way(
837
(base_ie.executable, lca_executable),
838
other_ie.executable, this_ie.executable)
839
if (parent_id_winner == 'this' and name_winner == 'this'
840
and sha1_winner == 'this' and exec_winner == 'this'):
841
# No kind, parent, name, exec, or content change for
842
# OTHER, so this node is not considered interesting
844
if sha1_winner == 'this':
845
content_changed = False
846
elif other_ie.kind == 'symlink':
847
def get_target(ie, tree):
848
if ie.kind != 'symlink':
850
return tree.get_symlink_target(file_id)
851
base_target = get_target(base_ie, self.base_tree)
852
lca_targets = [get_target(ie, tree) for ie, tree
853
in zip(lca_entries, self._lca_trees)]
854
this_target = get_target(this_ie, self.this_tree)
855
other_target = get_target(other_ie, self.other_tree)
856
target_winner = self._lca_multi_way(
857
(base_target, lca_targets),
858
other_target, this_target)
859
if (parent_id_winner == 'this' and name_winner == 'this'
860
and target_winner == 'this'):
861
# No kind, parent, name, or symlink target change
864
if target_winner == 'this':
865
content_changed = False
866
elif other_ie.kind == 'tree-reference':
867
# The 'changed' information seems to be handled at a higher
868
# level. At least, _entries3 returns False for content
869
# changed, even when at a new revision_id.
870
content_changed = False
871
if (parent_id_winner == 'this' and name_winner == 'this'):
872
# Nothing interesting
875
raise AssertionError('unhandled kind: %s' % other_ie.kind)
876
# XXX: We need to handle kind == 'symlink'
878
# If we have gotten this far, that means something has changed
879
result.append((file_id, content_changed,
880
((base_ie.parent_id, lca_parent_ids),
881
other_ie.parent_id, this_ie.parent_id),
882
((base_ie.name, lca_names),
883
other_ie.name, this_ie.name),
884
((base_ie.executable, lca_executable),
885
other_ie.executable, this_ie.executable)
892
self.tt.final_kind(self.tt.root)
894
self.tt.cancel_deletion(self.tt.root)
895
if self.tt.final_file_id(self.tt.root) is None:
896
self.tt.version_file(self.tt.tree_file_id(self.tt.root),
898
other_root_file_id = self.other_tree.get_root_id()
899
if other_root_file_id is None:
901
other_root = self.tt.trans_id_file_id(other_root_file_id)
902
if other_root == self.tt.root:
905
self.tt.final_kind(other_root)
908
if self.other_tree.inventory.root.file_id in self.this_tree.inventory:
909
# the other tree's root is a non-root in the current tree
911
self.reparent_children(self.other_tree.inventory.root, self.tt.root)
912
self.tt.cancel_creation(other_root)
913
self.tt.cancel_versioning(other_root)
915
def reparent_children(self, ie, target):
916
for thing, child in ie.children.iteritems():
917
trans_id = self.tt.trans_id_file_id(child.file_id)
918
self.tt.adjust_path(self.tt.final_name(trans_id), target, trans_id)
920
def write_modified(self, results):
922
for path in results.modified_paths:
923
file_id = self.this_tree.path2id(self.this_tree.relpath(path))
926
hash = self.this_tree.get_file_sha1(file_id)
929
modified_hashes[file_id] = hash
930
self.this_tree.set_merge_modified(modified_hashes)
933
def parent(entry, file_id):
934
"""Determine the parent for a file_id (used as a key method)"""
937
return entry.parent_id
940
def name(entry, file_id):
941
"""Determine the name for a file_id (used as a key method)"""
947
def contents_sha1(tree, file_id):
948
"""Determine the sha1 of the file contents (used as a key method)."""
949
if file_id not in tree:
951
return tree.get_file_sha1(file_id)
954
def executable(tree, file_id):
955
"""Determine the executability of a file-id (used as a key method)."""
956
if file_id not in tree:
958
if tree.kind(file_id) != "file":
960
return tree.is_executable(file_id)
963
def kind(tree, file_id):
964
"""Determine the kind of a file-id (used as a key method)."""
965
if file_id not in tree:
967
return tree.kind(file_id)
970
def _three_way(base, other, this):
971
#if base == other, either they all agree, or only THIS has changed.
974
elif this not in (base, other):
976
# "Ambiguous clean merge" -- both sides have made the same change.
979
# this == base: only other has changed.
984
def _lca_multi_way(bases, other, this, allow_overriding_lca=True):
985
"""Consider LCAs when determining whether a change has occurred.
987
If LCAS are all identical, this is the same as a _three_way comparison.
989
:param bases: value in (BASE, [LCAS])
990
:param other: value in OTHER
991
:param this: value in THIS
992
:param allow_overriding_lca: If there is more than one unique lca
993
value, allow OTHER to override THIS if it has a new value, and
994
THIS only has an lca value, or vice versa. This is appropriate for
995
truly scalar values, not as much for non-scalars.
996
:return: 'this', 'other', or 'conflict' depending on whether an entry
999
# See doc/developers/lca_tree_merging.txt for details about this
1002
# Either Ambiguously clean, or nothing was actually changed. We
1005
base_val, lca_vals = bases
1006
# Remove 'base_val' from the lca_vals, because it is not interesting
1007
filtered_lca_vals = [lca_val for lca_val in lca_vals
1008
if lca_val != base_val]
1009
if len(filtered_lca_vals) == 0:
1010
return Merge3Merger._three_way(base_val, other, this)
1012
unique_lca_vals = set(filtered_lca_vals)
1013
if len(unique_lca_vals) == 1:
1014
return Merge3Merger._three_way(unique_lca_vals.pop(), other, this)
1016
if allow_overriding_lca:
1017
if other in unique_lca_vals:
1018
if this in unique_lca_vals:
1019
# Each side picked a different lca, conflict
1022
# This has a value which supersedes both lca values, and
1023
# other only has an lca value
1025
elif this in unique_lca_vals:
1026
# OTHER has a value which supersedes both lca values, and this
1027
# only has an lca value
1030
# At this point, the lcas disagree, and the tips disagree
1034
def scalar_three_way(this_tree, base_tree, other_tree, file_id, key):
1035
"""Do a three-way test on a scalar.
1036
Return "this", "other" or "conflict", depending whether a value wins.
1038
key_base = key(base_tree, file_id)
1039
key_other = key(other_tree, file_id)
1040
#if base == other, either they all agree, or only THIS has changed.
1041
if key_base == key_other:
1043
key_this = key(this_tree, file_id)
1044
# "Ambiguous clean merge"
1045
if key_this == key_other:
1047
elif key_this == key_base:
1052
def merge_names(self, file_id):
1053
def get_entry(tree):
1054
if file_id in tree.inventory:
1055
return tree.inventory[file_id]
1058
this_entry = get_entry(self.this_tree)
1059
other_entry = get_entry(self.other_tree)
1060
base_entry = get_entry(self.base_tree)
1061
entries = (base_entry, other_entry, this_entry)
1064
for entry in entries:
1067
parents.append(None)
1069
names.append(entry.name)
1070
parents.append(entry.parent_id)
1071
return self._merge_names(file_id, parents, names,
1072
resolver=self._three_way)
1074
def _merge_names(self, file_id, parents, names, resolver):
1075
"""Perform a merge on file_id names and parents"""
1076
base_name, other_name, this_name = names
1077
base_parent, other_parent, this_parent = parents
1079
name_winner = resolver(*names)
1081
parent_id_winner = resolver(*parents)
1082
if this_name is None:
1083
if name_winner == "this":
1084
name_winner = "other"
1085
if parent_id_winner == "this":
1086
parent_id_winner = "other"
1087
if name_winner == "this" and parent_id_winner == "this":
1089
if name_winner == "conflict":
1090
trans_id = self.tt.trans_id_file_id(file_id)
1091
self._raw_conflicts.append(('name conflict', trans_id,
1092
this_name, other_name))
1093
if parent_id_winner == "conflict":
1094
trans_id = self.tt.trans_id_file_id(file_id)
1095
self._raw_conflicts.append(('parent conflict', trans_id,
1096
this_parent, other_parent))
1097
if other_name is None:
1098
# it doesn't matter whether the result was 'other' or
1099
# 'conflict'-- if there's no 'other', we leave it alone.
1101
# if we get here, name_winner and parent_winner are set to safe values.
1102
trans_id = self.tt.trans_id_file_id(file_id)
1103
parent_id = parents[self.winner_idx[parent_id_winner]]
1104
if parent_id is not None:
1105
parent_trans_id = self.tt.trans_id_file_id(parent_id)
1106
self.tt.adjust_path(names[self.winner_idx[name_winner]],
1107
parent_trans_id, trans_id)
1109
def merge_contents(self, file_id):
1110
"""Performs a merge on file_id contents."""
1111
def contents_pair(tree):
1112
if file_id not in tree:
1114
kind = tree.kind(file_id)
1116
contents = tree.get_file_sha1(file_id)
1117
elif kind == "symlink":
1118
contents = tree.get_symlink_target(file_id)
1121
return kind, contents
1123
def contents_conflict():
1124
trans_id = self.tt.trans_id_file_id(file_id)
1125
name = self.tt.final_name(trans_id)
1126
parent_id = self.tt.final_parent(trans_id)
1127
if file_id in self.this_tree.inventory:
1128
self.tt.unversion_file(trans_id)
1129
if file_id in self.this_tree:
1130
self.tt.delete_contents(trans_id)
1131
file_group = self._dump_conflicts(name, parent_id, file_id,
1133
self._raw_conflicts.append(('contents conflict', file_group))
1135
# See SPOT run. run, SPOT, run.
1136
# So we're not QUITE repeating ourselves; we do tricky things with
1138
base_pair = contents_pair(self.base_tree)
1139
other_pair = contents_pair(self.other_tree)
1141
this_pair = contents_pair(self.this_tree)
1142
lca_pairs = [contents_pair(tree) for tree in self._lca_trees]
1143
winner = self._lca_multi_way((base_pair, lca_pairs), other_pair,
1144
this_pair, allow_overriding_lca=False)
1146
if base_pair == other_pair:
1149
# We delayed evaluating this_pair as long as we can to avoid
1150
# unnecessary sha1 calculation
1151
this_pair = contents_pair(self.this_tree)
1152
winner = self._three_way(base_pair, other_pair, this_pair)
1153
if winner == 'this':
1154
# No interesting changes introduced by OTHER
1156
trans_id = self.tt.trans_id_file_id(file_id)
1157
if winner == 'other':
1158
# OTHER is a straight winner, so replace this contents with other
1159
file_in_this = file_id in self.this_tree
1161
# Remove any existing contents
1162
self.tt.delete_contents(trans_id)
1163
if file_id in self.other_tree:
1164
# OTHER changed the file
1166
if wt.supports_content_filtering():
1167
# We get the path from the working tree if it exists.
1168
# That fails though when OTHER is adding a file, so
1169
# we fall back to the other tree to find the path if
1170
# it doesn't exist locally.
1172
filter_tree_path = wt.id2path(file_id)
1173
except errors.NoSuchId:
1174
filter_tree_path = self.other_tree.id2path(file_id)
1176
# Skip the id2path lookup for older formats
1177
filter_tree_path = None
1178
create_from_tree(self.tt, trans_id,
1179
self.other_tree, file_id,
1180
filter_tree_path=filter_tree_path)
1181
if not file_in_this:
1182
self.tt.version_file(file_id, trans_id)
1185
# OTHER deleted the file
1186
self.tt.unversion_file(trans_id)
1189
# We have a hypothetical conflict, but if we have files, then we
1190
# can try to merge the content
1191
if this_pair[0] == 'file' and other_pair[0] == 'file':
1192
# THIS and OTHER are both files, so text merge. Either
1193
# BASE is a file, or both converted to files, so at least we
1194
# have agreement that output should be a file.
1196
self.text_merge(file_id, trans_id)
1198
return contents_conflict()
1199
if file_id not in self.this_tree:
1200
self.tt.version_file(file_id, trans_id)
1202
self.tt.tree_kind(trans_id)
1203
self.tt.delete_contents(trans_id)
1208
return contents_conflict()
1210
def get_lines(self, tree, file_id):
1211
"""Return the lines in a file, or an empty list."""
1213
return tree.get_file(file_id).readlines()
1217
def text_merge(self, file_id, trans_id):
1218
"""Perform a three-way text merge on a file_id"""
1219
# it's possible that we got here with base as a different type.
1220
# if so, we just want two-way text conflicts.
1221
if file_id in self.base_tree and \
1222
self.base_tree.kind(file_id) == "file":
1223
base_lines = self.get_lines(self.base_tree, file_id)
1226
other_lines = self.get_lines(self.other_tree, file_id)
1227
this_lines = self.get_lines(self.this_tree, file_id)
1228
m3 = Merge3(base_lines, this_lines, other_lines,
1229
is_cherrypick=self.cherrypick)
1230
start_marker = "!START OF MERGE CONFLICT!" + "I HOPE THIS IS UNIQUE"
1231
if self.show_base is True:
1232
base_marker = '|' * 7
1236
def iter_merge3(retval):
1237
retval["text_conflicts"] = False
1238
for line in m3.merge_lines(name_a = "TREE",
1239
name_b = "MERGE-SOURCE",
1240
name_base = "BASE-REVISION",
1241
start_marker=start_marker,
1242
base_marker=base_marker,
1243
reprocess=self.reprocess):
1244
if line.startswith(start_marker):
1245
retval["text_conflicts"] = True
1246
yield line.replace(start_marker, '<' * 7)
1250
merge3_iterator = iter_merge3(retval)
1251
self.tt.create_file(merge3_iterator, trans_id)
1252
if retval["text_conflicts"] is True:
1253
self._raw_conflicts.append(('text conflict', trans_id))
1254
name = self.tt.final_name(trans_id)
1255
parent_id = self.tt.final_parent(trans_id)
1256
file_group = self._dump_conflicts(name, parent_id, file_id,
1257
this_lines, base_lines,
1259
file_group.append(trans_id)
1261
def _dump_conflicts(self, name, parent_id, file_id, this_lines=None,
1262
base_lines=None, other_lines=None, set_version=False,
1264
"""Emit conflict files.
1265
If this_lines, base_lines, or other_lines are omitted, they will be
1266
determined automatically. If set_version is true, the .OTHER, .THIS
1267
or .BASE (in that order) will be created as versioned files.
1269
data = [('OTHER', self.other_tree, other_lines),
1270
('THIS', self.this_tree, this_lines)]
1272
data.append(('BASE', self.base_tree, base_lines))
1274
# We need to use the actual path in the working tree of the file here,
1275
# ignoring the conflict suffixes
1277
if wt.supports_content_filtering():
1279
filter_tree_path = wt.id2path(file_id)
1280
except errors.NoSuchId:
1281
# file has been deleted
1282
filter_tree_path = None
1284
# Skip the id2path lookup for older formats
1285
filter_tree_path = None
1289
for suffix, tree, lines in data:
1291
trans_id = self._conflict_file(name, parent_id, tree, file_id,
1292
suffix, lines, filter_tree_path)
1293
file_group.append(trans_id)
1294
if set_version and not versioned:
1295
self.tt.version_file(file_id, trans_id)
1299
def _conflict_file(self, name, parent_id, tree, file_id, suffix,
1300
lines=None, filter_tree_path=None):
1301
"""Emit a single conflict file."""
1302
name = name + '.' + suffix
1303
trans_id = self.tt.create_path(name, parent_id)
1304
create_from_tree(self.tt, trans_id, tree, file_id, lines,
1308
def merge_executable(self, file_id, file_status):
1309
"""Perform a merge on the execute bit."""
1310
executable = [self.executable(t, file_id) for t in (self.base_tree,
1311
self.other_tree, self.this_tree)]
1312
self._merge_executable(file_id, executable, file_status,
1313
resolver=self._three_way)
1315
def _merge_executable(self, file_id, executable, file_status,
1317
"""Perform a merge on the execute bit."""
1318
base_executable, other_executable, this_executable = executable
1319
if file_status == "deleted":
1321
winner = resolver(*executable)
1322
if winner == "conflict":
1323
# There must be a None in here, if we have a conflict, but we
1324
# need executability since file status was not deleted.
1325
if self.executable(self.other_tree, file_id) is None:
1329
if winner == 'this' and file_status != "modified":
1331
trans_id = self.tt.trans_id_file_id(file_id)
1333
if self.tt.final_kind(trans_id) != "file":
1337
if winner == "this":
1338
executability = this_executable
1340
if file_id in self.other_tree:
1341
executability = other_executable
1342
elif file_id in self.this_tree:
1343
executability = this_executable
1344
elif file_id in self.base_tree:
1345
executability = base_executable
1346
if executability is not None:
1347
trans_id = self.tt.trans_id_file_id(file_id)
1348
self.tt.set_executability(executability, trans_id)
1350
def cook_conflicts(self, fs_conflicts):
1351
"""Convert all conflicts into a form that doesn't depend on trans_id"""
1352
from conflicts import Conflict
1354
self.cooked_conflicts.extend(cook_conflicts(fs_conflicts, self.tt))
1355
fp = FinalPaths(self.tt)
1356
for conflict in self._raw_conflicts:
1357
conflict_type = conflict[0]
1358
if conflict_type in ('name conflict', 'parent conflict'):
1359
trans_id = conflict[1]
1360
conflict_args = conflict[2:]
1361
if trans_id not in name_conflicts:
1362
name_conflicts[trans_id] = {}
1363
unique_add(name_conflicts[trans_id], conflict_type,
1365
if conflict_type == 'contents conflict':
1366
for trans_id in conflict[1]:
1367
file_id = self.tt.final_file_id(trans_id)
234
1368
if file_id is not None:
235
interesting_ids.add(file_id)
238
raise BzrCommandError("%s is not a source file in any"
240
merge_inner(this_branch, other_tree, base_tree, tempdir,
241
ignore_zero=ignore_zero, backup_files=backup_files,
242
merge_type=merge_type, interesting_ids=interesting_ids)
244
shutil.rmtree(tempdir)
247
def set_interesting(inventory_a, inventory_b, interesting_ids):
248
"""Mark files whose ids are in interesting_ids as interesting
250
for inventory in (inventory_a, inventory_b):
251
for path, source_file in inventory.iteritems():
252
source_file.interesting = source_file.id in interesting_ids
255
def generate_cset_optimized(tree_a, tree_b, interesting_ids=None):
256
"""Generate a changeset. If interesting_ids is supplied, only changes
257
to those files will be shown. Metadata changes are stripped.
259
cset = generate_changeset(tree_a, tree_b, interesting_ids)
260
for entry in cset.entries.itervalues():
261
entry.metadata_change = None
265
def merge_inner(this_branch, other_tree, base_tree, tempdir,
266
ignore_zero=False, merge_type=ApplyMerge3, backup_files=False,
267
interesting_ids=None):
269
def merge_factory(file_id, base, other):
270
contents_change = merge_type(file_id, base, other)
272
contents_change = BackupBeforeChange(contents_change)
273
return contents_change
275
this_tree = get_tree((this_branch.base, None), tempdir, "this")[1]
277
def get_inventory(tree):
278
return tree.tree.inventory
280
inv_changes = merge_flex(this_tree, base_tree, other_tree,
281
generate_cset_optimized, get_inventory,
282
MergeConflictHandler(base_tree.root,
283
ignore_zero=ignore_zero),
284
merge_factory=merge_factory,
285
interesting_ids=interesting_ids)
288
for id, path in inv_changes.iteritems():
293
assert path.startswith('./'), "path is %s" % path
295
adjust_ids.append((path, id))
296
if len(adjust_ids) > 0:
297
this_branch.set_inventory(regen_inventory(this_branch, this_tree.root,
301
def regen_inventory(this_branch, root, new_entries):
302
old_entries = this_branch.read_working_inventory()
306
for path, file_id in new_entries:
309
new_entries_map[file_id] = path
311
def id2path(file_id):
312
path = new_entries_map.get(file_id)
315
entry = old_entries[file_id]
316
if entry.parent_id is None:
318
return os.path.join(id2path(entry.parent_id), entry.name)
320
for file_id in old_entries:
321
entry = old_entries[file_id]
322
path = id2path(file_id)
323
new_inventory[file_id] = (path, file_id, entry.parent_id, entry.kind)
324
by_path[path] = file_id
329
for path, file_id in new_entries:
331
del new_inventory[file_id]
334
new_path_list.append((path, file_id))
335
if file_id not in old_entries:
337
# Ensure no file is added before its parent
339
for path, file_id in new_path_list:
343
parent = by_path[os.path.dirname(path)]
344
kind = bzrlib.osutils.file_kind(os.path.join(root, path))
345
new_inventory[file_id] = (path, file_id, parent, kind)
346
by_path[path] = file_id
348
# Get a list in insertion order
349
new_inventory_list = new_inventory.values()
350
mutter ("""Inventory regeneration:
351
old length: %i insertions: %i deletions: %i new_length: %i"""\
352
% (len(old_entries), insertions, deletions, len(new_inventory_list)))
353
assert len(new_inventory_list) == len(old_entries) + insertions - deletions
354
new_inventory_list.sort()
355
return new_inventory_list
357
merge_types = { "merge3": (ApplyMerge3, "Native diff3-style merge"),
358
"diff3": (Diff3Merge, "Merge using external diff3")
1370
path = fp.get_path(trans_id)
1371
for suffix in ('.BASE', '.THIS', '.OTHER'):
1372
if path.endswith(suffix):
1373
path = path[:-len(suffix)]
1375
c = Conflict.factory(conflict_type, path=path, file_id=file_id)
1376
self.cooked_conflicts.append(c)
1377
if conflict_type == 'text conflict':
1378
trans_id = conflict[1]
1379
path = fp.get_path(trans_id)
1380
file_id = self.tt.final_file_id(trans_id)
1381
c = Conflict.factory(conflict_type, path=path, file_id=file_id)
1382
self.cooked_conflicts.append(c)
1384
for trans_id, conflicts in name_conflicts.iteritems():
1386
this_parent, other_parent = conflicts['parent conflict']
1387
if this_parent == other_parent:
1388
raise AssertionError()
1390
this_parent = other_parent = \
1391
self.tt.final_file_id(self.tt.final_parent(trans_id))
1393
this_name, other_name = conflicts['name conflict']
1394
if this_name == other_name:
1395
raise AssertionError()
1397
this_name = other_name = self.tt.final_name(trans_id)
1398
other_path = fp.get_path(trans_id)
1399
if this_parent is not None and this_name is not None:
1400
this_parent_path = \
1401
fp.get_path(self.tt.trans_id_file_id(this_parent))
1402
this_path = pathjoin(this_parent_path, this_name)
1404
this_path = "<deleted>"
1405
file_id = self.tt.final_file_id(trans_id)
1406
c = Conflict.factory('path conflict', path=this_path,
1407
conflict_path=other_path, file_id=file_id)
1408
self.cooked_conflicts.append(c)
1409
self.cooked_conflicts.sort(key=Conflict.sort_key)
1412
class WeaveMerger(Merge3Merger):
1413
"""Three-way tree merger, text weave merger."""
1414
supports_reprocess = True
1415
supports_show_base = False
1416
supports_reverse_cherrypick = False
1417
history_based = True
1419
def _merged_lines(self, file_id):
1420
"""Generate the merged lines.
1421
There is no distinction between lines that are meant to contain <<<<<<<
1425
base = self.base_tree
1428
plan = self.this_tree.plan_file_merge(file_id, self.other_tree,
1430
if 'merge' in debug.debug_flags:
1432
trans_id = self.tt.trans_id_file_id(file_id)
1433
name = self.tt.final_name(trans_id) + '.plan'
1434
contents = ('%10s|%s' % l for l in plan)
1435
self.tt.new_file(name, self.tt.final_parent(trans_id), contents)
1436
textmerge = PlanWeaveMerge(plan, '<<<<<<< TREE\n',
1437
'>>>>>>> MERGE-SOURCE\n')
1438
return textmerge.merge_lines(self.reprocess)
1440
def text_merge(self, file_id, trans_id):
1441
"""Perform a (weave) text merge for a given file and file-id.
1442
If conflicts are encountered, .THIS and .OTHER files will be emitted,
1443
and a conflict will be noted.
1445
lines, conflicts = self._merged_lines(file_id)
1447
# Note we're checking whether the OUTPUT is binary in this case,
1448
# because we don't want to get into weave merge guts.
1449
check_text_lines(lines)
1450
self.tt.create_file(lines, trans_id)
1452
self._raw_conflicts.append(('text conflict', trans_id))
1453
name = self.tt.final_name(trans_id)
1454
parent_id = self.tt.final_parent(trans_id)
1455
file_group = self._dump_conflicts(name, parent_id, file_id,
1457
file_group.append(trans_id)
1460
class LCAMerger(WeaveMerger):
1462
def _merged_lines(self, file_id):
1463
"""Generate the merged lines.
1464
There is no distinction between lines that are meant to contain <<<<<<<
1468
base = self.base_tree
1471
plan = self.this_tree.plan_file_lca_merge(file_id, self.other_tree,
1473
if 'merge' in debug.debug_flags:
1475
trans_id = self.tt.trans_id_file_id(file_id)
1476
name = self.tt.final_name(trans_id) + '.plan'
1477
contents = ('%10s|%s' % l for l in plan)
1478
self.tt.new_file(name, self.tt.final_parent(trans_id), contents)
1479
textmerge = PlanWeaveMerge(plan, '<<<<<<< TREE\n',
1480
'>>>>>>> MERGE-SOURCE\n')
1481
return textmerge.merge_lines(self.reprocess)
1484
class Diff3Merger(Merge3Merger):
1485
"""Three-way merger using external diff3 for text merging"""
1487
def dump_file(self, temp_dir, name, tree, file_id):
1488
out_path = pathjoin(temp_dir, name)
1489
out_file = open(out_path, "wb")
1491
in_file = tree.get_file(file_id)
1492
for line in in_file:
1493
out_file.write(line)
1498
def text_merge(self, file_id, trans_id):
1499
"""Perform a diff3 merge using a specified file-id and trans-id.
1500
If conflicts are encountered, .BASE, .THIS. and .OTHER conflict files
1501
will be dumped, and a will be conflict noted.
1504
temp_dir = osutils.mkdtemp(prefix="bzr-")
1506
new_file = pathjoin(temp_dir, "new")
1507
this = self.dump_file(temp_dir, "this", self.this_tree, file_id)
1508
base = self.dump_file(temp_dir, "base", self.base_tree, file_id)
1509
other = self.dump_file(temp_dir, "other", self.other_tree, file_id)
1510
status = bzrlib.patch.diff3(new_file, this, base, other)
1511
if status not in (0, 1):
1512
raise BzrError("Unhandled diff3 exit code")
1513
f = open(new_file, 'rb')
1515
self.tt.create_file(f, trans_id)
1519
name = self.tt.final_name(trans_id)
1520
parent_id = self.tt.final_parent(trans_id)
1521
self._dump_conflicts(name, parent_id, file_id)
1522
self._raw_conflicts.append(('text conflict', trans_id))
1524
osutils.rmtree(temp_dir)
1527
def merge_inner(this_branch, other_tree, base_tree, ignore_zero=False,
1529
merge_type=Merge3Merger,
1530
interesting_ids=None,
1534
interesting_files=None,
1537
change_reporter=None):
1538
"""Primary interface for merging.
1540
typical use is probably
1541
'merge_inner(branch, branch.get_revision_tree(other_revision),
1542
branch.get_revision_tree(base_revision))'
1544
if this_tree is None:
1545
raise BzrError("bzrlib.merge.merge_inner requires a this_tree "
1546
"parameter as of bzrlib version 0.8.")
1547
merger = Merger(this_branch, other_tree, base_tree, this_tree=this_tree,
1548
pb=pb, change_reporter=change_reporter)
1549
merger.backup_files = backup_files
1550
merger.merge_type = merge_type
1551
merger.interesting_ids = interesting_ids
1552
merger.ignore_zero = ignore_zero
1553
if interesting_files:
1555
raise ValueError('Only supply interesting_ids'
1556
' or interesting_files')
1557
merger.interesting_files = interesting_files
1558
merger.show_base = show_base
1559
merger.reprocess = reprocess
1560
merger.other_rev_id = other_rev_id
1561
merger.other_basis = other_rev_id
1562
get_revision_id = getattr(base_tree, 'get_revision_id', None)
1563
if get_revision_id is None:
1564
get_revision_id = base_tree.last_revision
1565
merger.cache_trees_with_revision_ids([other_tree, base_tree, this_tree])
1566
merger.set_base_revision(get_revision_id(), this_branch)
1567
return merger.do_merge()
1569
def get_merge_type_registry():
1570
"""Merge type registry is in bzrlib.option to avoid circular imports.
1572
This method provides a sanctioned way to retrieve it.
1574
from bzrlib import option
1575
return option._merge_type_registry
1578
def _plan_annotate_merge(annotated_a, annotated_b, ancestors_a, ancestors_b):
1579
def status_a(revision, text):
1580
if revision in ancestors_b:
1581
return 'killed-b', text
1583
return 'new-a', text
1585
def status_b(revision, text):
1586
if revision in ancestors_a:
1587
return 'killed-a', text
1589
return 'new-b', text
1591
plain_a = [t for (a, t) in annotated_a]
1592
plain_b = [t for (a, t) in annotated_b]
1593
matcher = patiencediff.PatienceSequenceMatcher(None, plain_a, plain_b)
1594
blocks = matcher.get_matching_blocks()
1597
for ai, bi, l in blocks:
1598
# process all mismatched sections
1599
# (last mismatched section is handled because blocks always
1600
# includes a 0-length last block)
1601
for revision, text in annotated_a[a_cur:ai]:
1602
yield status_a(revision, text)
1603
for revision, text in annotated_b[b_cur:bi]:
1604
yield status_b(revision, text)
1605
# and now the matched section
1608
for text_a in plain_a[ai:a_cur]:
1609
yield "unchanged", text_a
1612
class _PlanMergeBase(object):
1614
def __init__(self, a_rev, b_rev, vf, key_prefix):
1617
:param a_rev: Revision-id of one revision to merge
1618
:param b_rev: Revision-id of the other revision to merge
1619
:param vf: A VersionedFiles containing both revisions
1620
:param key_prefix: A prefix for accessing keys in vf, typically
1626
self._last_lines = None
1627
self._last_lines_revision_id = None
1628
self._cached_matching_blocks = {}
1629
self._key_prefix = key_prefix
1630
self._precache_tip_lines()
1632
def _precache_tip_lines(self):
1633
lines = self.get_lines([self.a_rev, self.b_rev])
1634
self.lines_a = lines[self.a_rev]
1635
self.lines_b = lines[self.b_rev]
1637
def get_lines(self, revisions):
1638
"""Get lines for revisions from the backing VersionedFiles.
1640
:raises RevisionNotPresent: on absent texts.
1642
keys = [(self._key_prefix + (rev,)) for rev in revisions]
1644
for record in self.vf.get_record_stream(keys, 'unordered', True):
1645
if record.storage_kind == 'absent':
1646
raise errors.RevisionNotPresent(record.key, self.vf)
1647
result[record.key[-1]] = osutils.chunks_to_lines(
1648
record.get_bytes_as('chunked'))
1651
def plan_merge(self):
1652
"""Generate a 'plan' for merging the two revisions.
1654
This involves comparing their texts and determining the cause of
1655
differences. If text A has a line and text B does not, then either the
1656
line was added to text A, or it was deleted from B. Once the causes
1657
are combined, they are written out in the format described in
1658
VersionedFile.plan_merge
1660
blocks = self._get_matching_blocks(self.a_rev, self.b_rev)
1661
unique_a, unique_b = self._unique_lines(blocks)
1662
new_a, killed_b = self._determine_status(self.a_rev, unique_a)
1663
new_b, killed_a = self._determine_status(self.b_rev, unique_b)
1664
return self._iter_plan(blocks, new_a, killed_b, new_b, killed_a)
1666
def _iter_plan(self, blocks, new_a, killed_b, new_b, killed_a):
1669
for i, j, n in blocks:
1670
for a_index in range(last_i, i):
1671
if a_index in new_a:
1672
if a_index in killed_b:
1673
yield 'conflicted-a', self.lines_a[a_index]
1675
yield 'new-a', self.lines_a[a_index]
1677
yield 'killed-b', self.lines_a[a_index]
1678
for b_index in range(last_j, j):
1679
if b_index in new_b:
1680
if b_index in killed_a:
1681
yield 'conflicted-b', self.lines_b[b_index]
1683
yield 'new-b', self.lines_b[b_index]
1685
yield 'killed-a', self.lines_b[b_index]
1686
# handle common lines
1687
for a_index in range(i, i+n):
1688
yield 'unchanged', self.lines_a[a_index]
1692
def _get_matching_blocks(self, left_revision, right_revision):
1693
"""Return a description of which sections of two revisions match.
1695
See SequenceMatcher.get_matching_blocks
1697
cached = self._cached_matching_blocks.get((left_revision,
1699
if cached is not None:
1701
if self._last_lines_revision_id == left_revision:
1702
left_lines = self._last_lines
1703
right_lines = self.get_lines([right_revision])[right_revision]
1705
lines = self.get_lines([left_revision, right_revision])
1706
left_lines = lines[left_revision]
1707
right_lines = lines[right_revision]
1708
self._last_lines = right_lines
1709
self._last_lines_revision_id = right_revision
1710
matcher = patiencediff.PatienceSequenceMatcher(None, left_lines,
1712
return matcher.get_matching_blocks()
1714
def _unique_lines(self, matching_blocks):
1715
"""Analyse matching_blocks to determine which lines are unique
1717
:return: a tuple of (unique_left, unique_right), where the values are
1718
sets of line numbers of unique lines.
1724
for i, j, n in matching_blocks:
1725
unique_left.extend(range(last_i, i))
1726
unique_right.extend(range(last_j, j))
1729
return unique_left, unique_right
1732
def _subtract_plans(old_plan, new_plan):
1733
"""Remove changes from new_plan that came from old_plan.
1735
It is assumed that the difference between the old_plan and new_plan
1736
is their choice of 'b' text.
1738
All lines from new_plan that differ from old_plan are emitted
1739
verbatim. All lines from new_plan that match old_plan but are
1740
not about the 'b' revision are emitted verbatim.
1742
Lines that match and are about the 'b' revision are the lines we
1743
don't want, so we convert 'killed-b' -> 'unchanged', and 'new-b'
1744
is skipped entirely.
1746
matcher = patiencediff.PatienceSequenceMatcher(None, old_plan,
1749
for i, j, n in matcher.get_matching_blocks():
1750
for jj in range(last_j, j):
1752
for jj in range(j, j+n):
1753
plan_line = new_plan[jj]
1754
if plan_line[0] == 'new-b':
1756
elif plan_line[0] == 'killed-b':
1757
yield 'unchanged', plan_line[1]
1763
class _PlanMerge(_PlanMergeBase):
1764
"""Plan an annotate merge using on-the-fly annotation"""
1766
def __init__(self, a_rev, b_rev, vf, key_prefix):
1767
super(_PlanMerge, self).__init__(a_rev, b_rev, vf, key_prefix)
1768
self.a_key = self._key_prefix + (self.a_rev,)
1769
self.b_key = self._key_prefix + (self.b_rev,)
1770
self.graph = Graph(self.vf)
1771
heads = self.graph.heads((self.a_key, self.b_key))
1773
# one side dominates, so we can just return its values, yay for
1775
# Ideally we would know that before we get this far
1776
self._head_key = heads.pop()
1777
if self._head_key == self.a_key:
1781
mutter('found dominating revision for %s\n%s > %s', self.vf,
1782
self._head_key[-1], other)
1785
self._head_key = None
1788
def _precache_tip_lines(self):
1789
# Turn this into a no-op, because we will do this later
1792
def _find_recursive_lcas(self):
1793
"""Find all the ancestors back to a unique lca"""
1794
cur_ancestors = (self.a_key, self.b_key)
1795
# graph.find_lca(uncommon, keys) now returns plain NULL_REVISION,
1796
# rather than a key tuple. We will just map that directly to no common
1800
next_lcas = self.graph.find_lca(*cur_ancestors)
1801
# Map a plain NULL_REVISION to a simple no-ancestors
1802
if next_lcas == set([NULL_REVISION]):
1804
# Order the lca's based on when they were merged into the tip
1805
# While the actual merge portion of weave merge uses a set() of
1806
# active revisions, the order of insertion *does* effect the
1807
# implicit ordering of the texts.
1808
for rev_key in cur_ancestors:
1809
ordered_parents = tuple(self.graph.find_merge_order(rev_key,
1811
parent_map[rev_key] = ordered_parents
1812
if len(next_lcas) == 0:
1814
elif len(next_lcas) == 1:
1815
parent_map[list(next_lcas)[0]] = ()
1817
elif len(next_lcas) > 2:
1818
# More than 2 lca's, fall back to grabbing all nodes between
1819
# this and the unique lca.
1820
mutter('More than 2 LCAs, falling back to all nodes for:'
1821
' %s, %s\n=> %s', self.a_key, self.b_key, cur_ancestors)
1822
cur_lcas = next_lcas
1823
while len(cur_lcas) > 1:
1824
cur_lcas = self.graph.find_lca(*cur_lcas)
1825
if len(cur_lcas) == 0:
1826
# No common base to find, use the full ancestry
1829
unique_lca = list(cur_lcas)[0]
1830
if unique_lca == NULL_REVISION:
1831
# find_lca will return a plain 'NULL_REVISION' rather
1832
# than a key tuple when there is no common ancestor, we
1833
# prefer to just use None, because it doesn't confuse
1834
# _get_interesting_texts()
1836
parent_map.update(self._find_unique_parents(next_lcas,
1839
cur_ancestors = next_lcas
1842
def _find_unique_parents(self, tip_keys, base_key):
1843
"""Find ancestors of tip that aren't ancestors of base.
1845
:param tip_keys: Nodes that are interesting
1846
:param base_key: Cull all ancestors of this node
1847
:return: The parent map for all revisions between tip_keys and
1848
base_key. base_key will be included. References to nodes outside of
1849
the ancestor set will also be removed.
1851
# TODO: this would be simpler if find_unique_ancestors took a list
1852
# instead of a single tip, internally it supports it, but it
1853
# isn't a "backwards compatible" api change.
1854
if base_key is None:
1855
parent_map = dict(self.graph.iter_ancestry(tip_keys))
1856
# We remove NULL_REVISION because it isn't a proper tuple key, and
1857
# thus confuses things like _get_interesting_texts, and our logic
1858
# to add the texts into the memory weave.
1859
if NULL_REVISION in parent_map:
1860
parent_map.pop(NULL_REVISION)
1863
for tip in tip_keys:
1865
self.graph.find_unique_ancestors(tip, [base_key]))
1866
parent_map = self.graph.get_parent_map(interesting)
1867
parent_map[base_key] = ()
1868
culled_parent_map, child_map, tails = self._remove_external_references(
1870
# Remove all the tails but base_key
1871
if base_key is not None:
1872
tails.remove(base_key)
1873
self._prune_tails(culled_parent_map, child_map, tails)
1874
# Now remove all the uninteresting 'linear' regions
1875
simple_map = _mod_graph.collapse_linear_regions(culled_parent_map)
1879
def _remove_external_references(parent_map):
1880
"""Remove references that go outside of the parent map.
1882
:param parent_map: Something returned from Graph.get_parent_map(keys)
1883
:return: (filtered_parent_map, child_map, tails)
1884
filtered_parent_map is parent_map without external references
1885
child_map is the {parent_key: [child_keys]} mapping
1886
tails is a list of nodes that do not have any parents in the map
1888
# TODO: The basic effect of this function seems more generic than
1889
# _PlanMerge. But the specific details of building a child_map,
1890
# and computing tails seems very specific to _PlanMerge.
1891
# Still, should this be in Graph land?
1892
filtered_parent_map = {}
1895
for key, parent_keys in parent_map.iteritems():
1896
culled_parent_keys = [p for p in parent_keys if p in parent_map]
1897
if not culled_parent_keys:
1899
for parent_key in culled_parent_keys:
1900
child_map.setdefault(parent_key, []).append(key)
1901
# TODO: Do we want to do this, it adds overhead for every node,
1902
# just to say that the node has no children
1903
child_map.setdefault(key, [])
1904
filtered_parent_map[key] = culled_parent_keys
1905
return filtered_parent_map, child_map, tails
1908
def _prune_tails(parent_map, child_map, tails_to_remove):
1909
"""Remove tails from the parent map.
1911
This will remove the supplied revisions until no more children have 0
1914
:param parent_map: A dict of {child: [parents]}, this dictionary will
1915
be modified in place.
1916
:param tails_to_remove: A list of tips that should be removed,
1917
this list will be consumed
1918
:param child_map: The reverse dict of parent_map ({parent: [children]})
1919
this dict will be modified
1920
:return: None, parent_map will be modified in place.
1922
while tails_to_remove:
1923
next = tails_to_remove.pop()
1924
parent_map.pop(next)
1925
children = child_map.pop(next)
1926
for child in children:
1927
child_parents = parent_map[child]
1928
child_parents.remove(next)
1929
if len(child_parents) == 0:
1930
tails_to_remove.append(child)
1932
def _get_interesting_texts(self, parent_map):
1933
"""Return a dict of texts we are interested in.
1935
Note that the input is in key tuples, but the output is in plain
1938
:param parent_map: The output from _find_recursive_lcas
1939
:return: A dict of {'revision_id':lines} as returned by
1940
_PlanMergeBase.get_lines()
1942
all_revision_keys = set(parent_map)
1943
all_revision_keys.add(self.a_key)
1944
all_revision_keys.add(self.b_key)
1946
# Everything else is in 'keys' but get_lines is in 'revision_ids'
1947
all_texts = self.get_lines([k[-1] for k in all_revision_keys])
1950
def _build_weave(self):
1951
from bzrlib import weave
1952
self._weave = weave.Weave(weave_name='in_memory_weave',
1953
allow_reserved=True)
1954
parent_map = self._find_recursive_lcas()
1956
all_texts = self._get_interesting_texts(parent_map)
1958
# Note: Unfortunately, the order given by topo_sort will effect the
1959
# ordering resolution in the output. Specifically, if you add A then B,
1960
# then in the output text A lines will show up before B lines. And, of
1961
# course, topo_sort doesn't guarantee any real ordering.
1962
# So we use merge_sort, and add a fake node on the tip.
1963
# This ensures that left-hand parents will always be inserted into the
1964
# weave before right-hand parents.
1965
tip_key = self._key_prefix + (_mod_revision.CURRENT_REVISION,)
1966
parent_map[tip_key] = (self.a_key, self.b_key)
1968
for seq_num, key, depth, eom in reversed(tsort.merge_sort(parent_map,
1972
# for key in tsort.topo_sort(parent_map):
1973
parent_keys = parent_map[key]
1974
revision_id = key[-1]
1975
parent_ids = [k[-1] for k in parent_keys]
1976
self._weave.add_lines(revision_id, parent_ids,
1977
all_texts[revision_id])
1979
def plan_merge(self):
1980
"""Generate a 'plan' for merging the two revisions.
1982
This involves comparing their texts and determining the cause of
1983
differences. If text A has a line and text B does not, then either the
1984
line was added to text A, or it was deleted from B. Once the causes
1985
are combined, they are written out in the format described in
1986
VersionedFile.plan_merge
1988
if self._head_key is not None: # There was a single head
1989
if self._head_key == self.a_key:
1992
if self._head_key != self.b_key:
1993
raise AssertionError('There was an invalid head: %s != %s'
1994
% (self.b_key, self._head_key))
1996
head_rev = self._head_key[-1]
1997
lines = self.get_lines([head_rev])[head_rev]
1998
return ((plan, line) for line in lines)
1999
return self._weave.plan_merge(self.a_rev, self.b_rev)
2002
class _PlanLCAMerge(_PlanMergeBase):
2004
This merge algorithm differs from _PlanMerge in that:
2005
1. comparisons are done against LCAs only
2006
2. cases where a contested line is new versus one LCA but old versus
2007
another are marked as conflicts, by emitting the line as conflicted-a
2010
This is faster, and hopefully produces more useful output.
2013
def __init__(self, a_rev, b_rev, vf, key_prefix, graph):
2014
_PlanMergeBase.__init__(self, a_rev, b_rev, vf, key_prefix)
2015
lcas = graph.find_lca(key_prefix + (a_rev,), key_prefix + (b_rev,))
2018
if lca == NULL_REVISION:
2021
self.lcas.add(lca[-1])
2022
for lca in self.lcas:
2023
if _mod_revision.is_null(lca):
2026
lca_lines = self.get_lines([lca])[lca]
2027
matcher = patiencediff.PatienceSequenceMatcher(None, self.lines_a,
2029
blocks = list(matcher.get_matching_blocks())
2030
self._cached_matching_blocks[(a_rev, lca)] = blocks
2031
matcher = patiencediff.PatienceSequenceMatcher(None, self.lines_b,
2033
blocks = list(matcher.get_matching_blocks())
2034
self._cached_matching_blocks[(b_rev, lca)] = blocks
2036
def _determine_status(self, revision_id, unique_line_numbers):
2037
"""Determines the status unique lines versus all lcas.
2039
Basically, determines why the line is unique to this revision.
2041
A line may be determined new, killed, or both.
2043
If a line is determined new, that means it was not present in at least
2044
one LCA, and is not present in the other merge revision.
2046
If a line is determined killed, that means the line was present in
2049
If a line is killed and new, this indicates that the two merge
2050
revisions contain differing conflict resolutions.
2051
:param revision_id: The id of the revision in which the lines are
2053
:param unique_line_numbers: The line numbers of unique lines.
2054
:return a tuple of (new_this, killed_other):
2058
unique_line_numbers = set(unique_line_numbers)
2059
for lca in self.lcas:
2060
blocks = self._get_matching_blocks(revision_id, lca)
2061
unique_vs_lca, _ignored = self._unique_lines(blocks)
2062
new.update(unique_line_numbers.intersection(unique_vs_lca))
2063
killed.update(unique_line_numbers.difference(unique_vs_lca))
added
removed
bzrlib/merge.py
