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from merge_core import merge_flex, ApplyMerge3, BackupBeforeChange
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from changeset import generate_changeset, ExceptionConflictHandler
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from 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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class UnrelatedBranches(BzrCommandError):
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msg = "Branches have no common ancestor, and no base revision"\
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BzrCommandError.__init__(self, msg)
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class MergeConflictHandler(ExceptionConflictHandler):
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"""Handle conflicts encountered while merging"""
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def __init__(self, dir, ignore_zero=False):
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ExceptionConflictHandler.__init__(self, dir)
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self.ignore_zero = ignore_zero
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def copy(self, source, dest):
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"""Copy the text and mode of a file
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:param source: The path of the file to copy
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:param dest: The distination file to create
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s_file = file(source, "rb")
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d_file = file(dest, "wb")
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os.chmod(dest, 0777 & os.stat(source).st_mode)
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def add_suffix(self, name, suffix, last_new_name=None):
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"""Rename a file to append a suffix. If the new name exists, the
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suffix is added repeatedly until a non-existant name is found
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:param name: The path of the file
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:param suffix: The suffix to append
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:param last_new_name: (used for recursive calls) the last name tried
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if last_new_name is None:
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new_name = last_new_name+suffix
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os.rename(name, new_name)
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if e.errno != errno.EEXIST and e.errno != errno.ENOTEMPTY:
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return self.add_suffix(name, suffix, last_new_name=new_name)
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def conflict(self, text):
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def merge_conflict(self, new_file, this_path, base_path, other_path):
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Handle diff3 conflicts by producing a .THIS, .BASE and .OTHER. The
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main file will be a version with diff3 conflicts.
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:param new_file: Path to the output file with diff3 markers
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:param this_path: Path to the file text for the THIS tree
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:param base_path: Path to the file text for the BASE tree
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:param other_path: Path to the file text for the OTHER tree
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self.add_suffix(this_path, ".THIS")
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self.copy(base_path, this_path+".BASE")
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self.copy(other_path, this_path+".OTHER")
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os.rename(new_file, this_path)
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self.conflict("Diff3 conflict encountered in %s" % this_path)
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def target_exists(self, entry, target, old_path):
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"""Handle the case when the target file or dir exists"""
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moved_path = self.add_suffix(target, ".moved")
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self.conflict("Moved existing %s to %s" % (target, moved_path))
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def rmdir_non_empty(self, filename):
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"""Handle the case where the dir to be removed still has contents"""
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self.conflict("Directory %s not removed because it is not empty"\
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if not self.ignore_zero:
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print "%d conflicts encountered.\n" % self.conflicts
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class SourceFile(object):
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def __init__(self, path, id, present=None, isdir=None):
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self.present = present
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self.interesting = True
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return "SourceFile(%s, %s)" % (self.path, self.id)
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def get_tree(treespec, temp_root, label):
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location, revno = treespec
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branch = find_branch(location)
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base_tree = branch.working_tree()
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base_tree = branch.basis_tree()
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base_tree = branch.revision_tree(branch.lookup_revision(revno))
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temp_path = os.path.join(temp_root, label)
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return branch, MergeTree(base_tree, temp_path)
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def abspath(tree, file_id):
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path = tree.inventory.id2path(file_id)
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def file_exists(tree, file_id):
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return tree.has_filename(tree.id2path(file_id))
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def inventory_map(tree):
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for file_id in tree.inventory:
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path = abspath(tree, file_id)
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inventory[path] = SourceFile(path, file_id)
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class MergeTree(object):
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def __init__(self, tree, tempdir):
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object.__init__(self)
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if hasattr(tree, "basedir"):
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self.root = tree.basedir
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self.inventory = inventory_map(tree)
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self.tempdir = tempdir
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os.mkdir(os.path.join(self.tempdir, "texts"))
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def readonly_path(self, id):
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if id not in self.tree:
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if self.root is not None:
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return self.tree.abspath(self.tree.id2path(id))
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if self.tree.inventory[id].kind in ("directory", "root_directory"):
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if not self.cached.has_key(id):
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path = os.path.join(self.tempdir, "texts", id)
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outfile = file(path, "wb")
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outfile.write(self.tree.get_file(id).read())
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assert(os.path.exists(path))
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self.cached[id] = path
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return self.cached[id]
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def merge(other_revision, base_revision,
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check_clean=True, ignore_zero=False,
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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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# 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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branch as _mod_branch,
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conflicts as _mod_conflicts,
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revision as _mod_revision,
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from bzrlib.symbol_versioning import (
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# TODO: Report back as changes are merged in
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def transform_tree(from_tree, to_tree, interesting_ids=None):
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from_tree.lock_tree_write()
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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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pb = progress.DummyProgress()
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self.recurse = recurse
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self.change_reporter = change_reporter
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self._cached_trees = {}
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self._revision_graph = revision_graph
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self._base_is_ancestor = None
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self._base_is_other_ancestor = None
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self._is_criss_cross = None
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self._lca_trees = None
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def cache_trees_with_revision_ids(self, trees):
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"""Cache any tree in trees if it has a revision_id."""
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for maybe_tree in trees:
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if maybe_tree is None:
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rev_id = maybe_tree.get_revision_id()
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except AttributeError:
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self._cached_trees[rev_id] = maybe_tree
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def revision_graph(self):
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if self._revision_graph is None:
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self._revision_graph = self.this_branch.repository.get_graph()
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return self._revision_graph
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def _set_base_is_ancestor(self, value):
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self._base_is_ancestor = value
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def _get_base_is_ancestor(self):
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if self._base_is_ancestor is None:
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self._base_is_ancestor = self.revision_graph.is_ancestor(
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self.base_rev_id, self.this_basis)
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return self._base_is_ancestor
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base_is_ancestor = property(_get_base_is_ancestor, _set_base_is_ancestor)
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def _set_base_is_other_ancestor(self, value):
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self._base_is_other_ancestor = value
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def _get_base_is_other_ancestor(self):
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if self._base_is_other_ancestor is None:
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if self.other_basis is None:
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self._base_is_other_ancestor = self.revision_graph.is_ancestor(
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self.base_rev_id, self.other_basis)
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return self._base_is_other_ancestor
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base_is_other_ancestor = property(_get_base_is_other_ancestor,
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_set_base_is_other_ancestor)
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def from_uncommitted(tree, other_tree, pb=None, base_tree=None):
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"""Return a Merger for uncommitted changes in other_tree.
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:param tree: The tree to merge into
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:param other_tree: The tree to get uncommitted changes from
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:param pb: A progress indicator
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:param base_tree: The basis to use for the merge. If unspecified,
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other_tree.basis_tree() will be used.
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if base_tree is None:
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base_tree = other_tree.basis_tree()
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merger = Merger(tree.branch, other_tree, base_tree, tree, pb)
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merger.base_rev_id = merger.base_tree.get_revision_id()
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merger.other_rev_id = None
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merger.other_basis = merger.base_rev_id
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def from_mergeable(klass, tree, mergeable, pb):
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"""Return a Merger for a bundle or merge directive.
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:param tree: The tree to merge changes into
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:param mergeable: A merge directive or bundle
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:param pb: A progress indicator
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mergeable.install_revisions(tree.branch.repository)
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base_revision_id, other_revision_id, verified =\
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mergeable.get_merge_request(tree.branch.repository)
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revision_graph = tree.branch.repository.get_graph()
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if base_revision_id is not None:
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if (base_revision_id != _mod_revision.NULL_REVISION and
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revision_graph.is_ancestor(
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base_revision_id, tree.branch.last_revision())):
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base_revision_id = None
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trace.warning('Performing cherrypick')
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merger = klass.from_revision_ids(pb, tree, other_revision_id,
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base_revision_id, revision_graph=
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return merger, verified
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def from_revision_ids(pb, tree, other, base=None, other_branch=None,
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base_branch=None, revision_graph=None,
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"""Return a Merger for revision-ids.
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:param pb: A progress indicator
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:param tree: The tree to merge changes into
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:param other: The revision-id to use as OTHER
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:param base: The revision-id to use as BASE. If not specified, will
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:param other_branch: A branch containing the other revision-id. If
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not supplied, tree.branch is used.
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:param base_branch: A branch containing the base revision-id. If
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not supplied, other_branch or tree.branch will be used.
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:param revision_graph: If you have a revision_graph precomputed, pass
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it in, otherwise it will be created for you.
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:param tree_branch: The branch associated with tree. If not supplied,
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tree.branch will be used.
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if tree_branch is None:
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tree_branch = tree.branch
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merger = Merger(tree_branch, this_tree=tree, pb=pb,
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revision_graph=revision_graph)
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if other_branch is None:
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other_branch = tree.branch
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merger.set_other_revision(other, other_branch)
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if base_branch is None:
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base_branch = other_branch
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merger.set_base_revision(base, base_branch)
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def revision_tree(self, revision_id, branch=None):
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if revision_id not in self._cached_trees:
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branch = self.this_branch
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tree = self.this_tree.revision_tree(revision_id)
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except errors.NoSuchRevisionInTree:
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tree = branch.repository.revision_tree(revision_id)
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self._cached_trees[revision_id] = tree
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return self._cached_trees[revision_id]
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def _get_tree(self, treespec, possible_transports=None):
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from bzrlib import workingtree
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location, revno = treespec
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tree = workingtree.WorkingTree.open_containing(location)[0]
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return tree.branch, tree
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branch = _mod_branch.Branch.open_containing(
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location, possible_transports)[0]
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revision_id = branch.last_revision()
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revision_id = branch.get_rev_id(revno)
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revision_id = _mod_revision.ensure_null(revision_id)
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return branch, self.revision_tree(revision_id, branch)
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@deprecated_method(deprecated_in((2, 1, 0)))
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def ensure_revision_trees(self):
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if self.this_revision_tree is None:
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self.this_basis_tree = self.revision_tree(self.this_basis)
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if self.this_basis == self.this_rev_id:
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self.this_revision_tree = self.this_basis_tree
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if self.other_rev_id is None:
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other_basis_tree = self.revision_tree(self.other_basis)
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if other_basis_tree.has_changes(self.other_tree):
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raise WorkingTreeNotRevision(self.this_tree)
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other_rev_id = self.other_basis
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self.other_tree = other_basis_tree
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@deprecated_method(deprecated_in((2, 1, 0)))
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def file_revisions(self, file_id):
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self.ensure_revision_trees()
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def get_id(tree, file_id):
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revision_id = tree.inventory[file_id].revision
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if self.this_rev_id is None:
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if self.this_basis_tree.get_file_sha1(file_id) != \
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self.this_tree.get_file_sha1(file_id):
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raise errors.WorkingTreeNotRevision(self.this_tree)
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trees = (self.this_basis_tree, self.other_tree)
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return [get_id(tree, file_id) for tree in trees]
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@deprecated_method(deprecated_in((2, 1, 0)))
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def check_basis(self, check_clean, require_commits=True):
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if self.this_basis is None and require_commits is True:
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raise errors.BzrCommandError(
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"This branch has no commits."
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" (perhaps you would prefer 'bzr pull')")
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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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@deprecated_method(deprecated_in((2, 1, 0)))
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def compare_basis(self):
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basis_tree = self.revision_tree(self.this_tree.last_revision())
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except errors.NoSuchRevision:
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basis_tree = self.this_tree.basis_tree()
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if not self.this_tree.has_changes(basis_tree):
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self.this_rev_id = self.this_basis
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def set_interesting_files(self, file_list):
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self.interesting_files = file_list
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def set_pending(self):
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if (not self.base_is_ancestor or not self.base_is_other_ancestor
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or self.other_rev_id is None):
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def _add_parent(self):
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new_parents = self.this_tree.get_parent_ids() + [self.other_rev_id]
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new_parent_trees = []
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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 errors.NoCommits(self.other_branch)
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self.other_basis = self.other_rev_id
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elif other_revision[1] is not None:
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self.other_rev_id = self.other_branch.get_rev_id(other_revision[1])
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self.other_basis = self.other_rev_id
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self.other_rev_id = None
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self.other_basis = self.other_branch.last_revision()
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if self.other_basis is None:
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raise errors.NoCommits(self.other_branch)
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if self.other_rev_id is not None:
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self._cached_trees[self.other_rev_id] = self.other_tree
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self._maybe_fetch(self.other_branch,self.this_branch, self.other_basis)
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def set_other_revision(self, revision_id, other_branch):
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"""Set 'other' based on a branch and revision id
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:param revision_id: The revision to use for a tree
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:param other_branch: The branch containing this tree
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self.other_rev_id = revision_id
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self.other_branch = other_branch
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self._maybe_fetch(other_branch, self.this_branch, self.other_rev_id)
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self.other_tree = self.revision_tree(revision_id)
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self.other_basis = revision_id
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def set_base_revision(self, revision_id, branch):
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"""Set 'base' based on a branch and revision id
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:param revision_id: The revision to use for a tree
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:param branch: The branch containing this tree
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self.base_rev_id = revision_id
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self.base_branch = branch
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self._maybe_fetch(branch, self.this_branch, revision_id)
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self.base_tree = self.revision_tree(revision_id)
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def _maybe_fetch(self, source, target, revision_id):
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if not source.repository.has_same_location(target.repository):
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target.fetch(source, revision_id)
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revisions = [_mod_revision.ensure_null(self.this_basis),
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_mod_revision.ensure_null(self.other_basis)]
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if _mod_revision.NULL_REVISION in revisions:
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self.base_rev_id = _mod_revision.NULL_REVISION
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self.base_tree = self.revision_tree(self.base_rev_id)
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self._is_criss_cross = False
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lcas = self.revision_graph.find_lca(revisions[0], revisions[1])
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self._is_criss_cross = False
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self.base_rev_id = _mod_revision.NULL_REVISION
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self.base_rev_id = list(lcas)[0]
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else: # len(lcas) > 1
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# find_unique_lca can only handle 2 nodes, so we have to
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# start back at the beginning. It is a shame to traverse
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# the graph again, but better than re-implementing
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self.base_rev_id = self.revision_graph.find_unique_lca(
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revisions[0], revisions[1])
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self.base_rev_id = self.revision_graph.find_unique_lca(
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self._is_criss_cross = True
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if self.base_rev_id == _mod_revision.NULL_REVISION:
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raise errors.UnrelatedBranches()
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if self._is_criss_cross:
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trace.warning('Warning: criss-cross merge encountered. See bzr'
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' help criss-cross.')
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trace.mutter('Criss-cross lcas: %r' % lcas)
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interesting_revision_ids = [self.base_rev_id]
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interesting_revision_ids.extend(lcas)
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interesting_trees = dict((t.get_revision_id(), t)
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for t in self.this_branch.repository.revision_trees(
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interesting_revision_ids))
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self._cached_trees.update(interesting_trees)
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self.base_tree = interesting_trees.pop(self.base_rev_id)
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sorted_lca_keys = self.revision_graph.find_merge_order(
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self._lca_trees = [interesting_trees[key]
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for key in sorted_lca_keys]
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self.base_tree = self.revision_tree(self.base_rev_id)
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self.base_is_ancestor = True
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self.base_is_other_ancestor = True
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trace.mutter('Base revid: %r' % self.base_rev_id)
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def set_base(self, base_revision):
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"""Set the base revision to use for the merge.
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:param base_revision: A 2-list containing a path and revision number.
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trace.mutter("doing merge() with no base_revision specified")
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if base_revision == [None, None]:
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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:
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kwargs['base_tree'] = self.base_tree
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if self.merge_type.supports_reprocess:
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kwargs['reprocess'] = self.reprocess
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raise errors.BzrError(
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"Conflict reduction is not supported for merge"
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" type %s." % self.merge_type)
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if self.merge_type.supports_show_base:
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kwargs['show_base'] = self.show_base
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raise errors.BzrError("Showing base is not supported for this"
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" merge type. %s" % self.merge_type)
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if (not getattr(self.merge_type, 'supports_reverse_cherrypick', True)
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and not self.base_is_other_ancestor):
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raise errors.CannotReverseCherrypick()
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if self.merge_type.supports_cherrypick:
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kwargs['cherrypick'] = (not self.base_is_ancestor or
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not self.base_is_other_ancestor)
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if self._is_criss_cross and getattr(self.merge_type,
458
'supports_lca_trees', False):
459
kwargs['lca_trees'] = self._lca_trees
460
return self.merge_type(pb=self._pb,
461
change_reporter=self.change_reporter,
464
def _do_merge_to(self, merge):
465
if self.other_branch is not None:
466
self.other_branch.update_references(self.this_branch)
468
if self.recurse == 'down':
469
for relpath, file_id in self.this_tree.iter_references():
470
sub_tree = self.this_tree.get_nested_tree(file_id, relpath)
471
other_revision = self.other_tree.get_reference_revision(
473
if other_revision == sub_tree.last_revision():
475
sub_merge = Merger(sub_tree.branch, this_tree=sub_tree)
476
sub_merge.merge_type = self.merge_type
477
other_branch = self.other_branch.reference_parent(file_id, relpath)
478
sub_merge.set_other_revision(other_revision, other_branch)
479
base_revision = self.base_tree.get_reference_revision(file_id)
480
sub_merge.base_tree = \
481
sub_tree.branch.repository.revision_tree(base_revision)
482
sub_merge.base_rev_id = base_revision
486
self.this_tree.lock_tree_write()
488
if self.base_tree is not None:
489
self.base_tree.lock_read()
491
if self.other_tree is not None:
492
self.other_tree.lock_read()
494
merge = self.make_merger()
495
self._do_merge_to(merge)
497
if self.other_tree is not None:
498
self.other_tree.unlock()
500
if self.base_tree is not None:
501
self.base_tree.unlock()
503
self.this_tree.unlock()
504
if len(merge.cooked_conflicts) == 0:
505
if not self.ignore_zero and not trace.is_quiet():
506
trace.note("All changes applied successfully.")
508
trace.note("%d conflicts encountered."
509
% len(merge.cooked_conflicts))
511
return len(merge.cooked_conflicts)
514
class _InventoryNoneEntry(object):
515
"""This represents an inventory entry which *isn't there*.
517
It simplifies the merging logic if we always have an InventoryEntry, even
518
if it isn't actually present
525
symlink_target = None
528
_none_entry = _InventoryNoneEntry()
531
class Merge3Merger(object):
532
"""Three-way merger that uses the merge3 text merger"""
534
supports_reprocess = True
535
supports_show_base = True
536
history_based = False
537
supports_cherrypick = True
538
supports_reverse_cherrypick = True
539
winner_idx = {"this": 2, "other": 1, "conflict": 1}
540
supports_lca_trees = True
542
def __init__(self, working_tree, this_tree, base_tree, other_tree,
543
interesting_ids=None, reprocess=False, show_base=False,
544
pb=progress.DummyProgress(), pp=None, change_reporter=None,
545
interesting_files=None, do_merge=True,
546
cherrypick=False, lca_trees=None):
547
"""Initialize the merger object and perform the merge.
549
:param working_tree: The working tree to apply the merge to
550
:param this_tree: The local tree in the merge operation
551
:param base_tree: The common tree in the merge operation
552
:param other_tree: The other tree to merge changes from
553
:param interesting_ids: The file_ids of files that should be
554
participate in the merge. May not be combined with
556
:param: reprocess If True, perform conflict-reduction processing.
557
:param show_base: If True, show the base revision in text conflicts.
558
(incompatible with reprocess)
559
:param pb: A Progress bar
560
:param pp: A ProgressPhase object
561
:param change_reporter: An object that should report changes made
562
:param interesting_files: The tree-relative paths of files that should
563
participate in the merge. If these paths refer to directories,
564
the contents of those directories will also be included. May not
565
be combined with interesting_ids. If neither interesting_files nor
566
interesting_ids is specified, all files may participate in the
568
:param lca_trees: Can be set to a dictionary of {revision_id:rev_tree}
569
if the ancestry was found to include a criss-cross merge.
570
Otherwise should be None.
572
object.__init__(self)
573
if interesting_files is not None and interesting_ids is not None:
575
'specify either interesting_ids or interesting_files')
576
self.interesting_ids = interesting_ids
577
self.interesting_files = interesting_files
578
self.this_tree = working_tree
579
self.base_tree = base_tree
580
self.other_tree = other_tree
581
self._raw_conflicts = []
582
self.cooked_conflicts = []
583
self.reprocess = reprocess
584
self.show_base = show_base
585
self._lca_trees = lca_trees
586
# Uncommenting this will change the default algorithm to always use
587
# _entries_lca. This can be useful for running the test suite and
588
# making sure we haven't missed any corner cases.
589
# if lca_trees is None:
590
# self._lca_trees = [self.base_tree]
593
self.change_reporter = change_reporter
594
self.cherrypick = cherrypick
596
self.pp = progress.ProgressPhase("Merge phase", 3, self.pb)
601
self.this_tree.lock_tree_write()
602
self.base_tree.lock_read()
603
self.other_tree.lock_read()
605
self.tt = transform.TreeTransform(self.this_tree, self.pb)
608
self._compute_transform()
610
results = self.tt.apply(no_conflicts=True)
611
self.write_modified(results)
613
self.this_tree.add_conflicts(self.cooked_conflicts)
614
except errors.UnsupportedOperation:
619
self.other_tree.unlock()
620
self.base_tree.unlock()
621
self.this_tree.unlock()
624
def make_preview_transform(self):
625
self.base_tree.lock_read()
626
self.other_tree.lock_read()
627
self.tt = transform.TransformPreview(self.this_tree)
630
self._compute_transform()
633
self.other_tree.unlock()
634
self.base_tree.unlock()
638
def _compute_transform(self):
639
if self._lca_trees is None:
640
entries = self._entries3()
641
resolver = self._three_way
643
entries = self._entries_lca()
644
resolver = self._lca_multi_way
645
child_pb = ui.ui_factory.nested_progress_bar()
647
for num, (file_id, changed, parents3, names3,
648
executable3) in enumerate(entries):
649
child_pb.update('Preparing file merge', num, len(entries))
650
self._merge_names(file_id, parents3, names3, resolver=resolver)
652
file_status = self.merge_contents(file_id)
654
file_status = 'unmodified'
655
self._merge_executable(file_id,
656
executable3, file_status, resolver=resolver)
661
child_pb = ui.ui_factory.nested_progress_bar()
663
fs_conflicts = transform.resolve_conflicts(self.tt, child_pb,
664
lambda t, c: transform.conflict_pass(t, c, self.other_tree))
667
if self.change_reporter is not None:
668
from bzrlib import delta
669
delta.report_changes(
670
self.tt.iter_changes(), self.change_reporter)
671
self.cook_conflicts(fs_conflicts)
672
for conflict in self.cooked_conflicts:
673
trace.warning(conflict)
676
"""Gather data about files modified between three trees.
678
Return a list of tuples of file_id, changed, parents3, names3,
679
executable3. changed is a boolean indicating whether the file contents
680
or kind were changed. parents3 is a tuple of parent ids for base,
681
other and this. names3 is a tuple of names for base, other and this.
682
executable3 is a tuple of execute-bit values for base, other and this.
685
iterator = self.other_tree.iter_changes(self.base_tree,
686
include_unchanged=True, specific_files=self.interesting_files,
687
extra_trees=[self.this_tree])
688
this_entries = dict((e.file_id, e) for p, e in
689
self.this_tree.iter_entries_by_dir(
690
self.interesting_ids))
691
for (file_id, paths, changed, versioned, parents, names, kind,
692
executable) in iterator:
693
if (self.interesting_ids is not None and
694
file_id not in self.interesting_ids):
696
entry = this_entries.get(file_id)
697
if entry is not None:
698
this_name = entry.name
699
this_parent = entry.parent_id
700
this_executable = entry.executable
704
this_executable = None
705
parents3 = parents + (this_parent,)
706
names3 = names + (this_name,)
707
executable3 = executable + (this_executable,)
708
result.append((file_id, changed, parents3, names3, executable3))
711
def _entries_lca(self):
712
"""Gather data about files modified between multiple trees.
714
This compares OTHER versus all LCA trees, and for interesting entries,
715
it then compares with THIS and BASE.
717
For the multi-valued entries, the format will be (BASE, [lca1, lca2])
718
:return: [(file_id, changed, parents, names, executable)]
719
file_id Simple file_id of the entry
720
changed Boolean, True if the kind or contents changed
722
parents ((base, [parent_id, in, lcas]), parent_id_other,
724
names ((base, [name, in, lcas]), name_in_other, name_in_this)
725
executable ((base, [exec, in, lcas]), exec_in_other, exec_in_this)
727
if self.interesting_files is not None:
728
lookup_trees = [self.this_tree, self.base_tree]
729
lookup_trees.extend(self._lca_trees)
730
# I think we should include the lca trees as well
731
interesting_ids = self.other_tree.paths2ids(self.interesting_files,
734
interesting_ids = self.interesting_ids
736
walker = _mod_tree.MultiWalker(self.other_tree, self._lca_trees)
738
base_inventory = self.base_tree.inventory
739
this_inventory = self.this_tree.inventory
740
for path, file_id, other_ie, lca_values in walker.iter_all():
741
# Is this modified at all from any of the other trees?
743
other_ie = _none_entry
744
if interesting_ids is not None and file_id not in interesting_ids:
747
# If other_revision is found in any of the lcas, that means this
748
# node is uninteresting. This is because when merging, if there are
749
# multiple heads(), we have to create a new node. So if we didn't,
750
# we know that the ancestry is linear, and that OTHER did not
752
# See doc/developers/lca_merge_resolution.txt for details
753
other_revision = other_ie.revision
754
if other_revision is not None:
755
# We can't use this shortcut when other_revision is None,
756
# because it may be None because things are WorkingTrees, and
757
# not because it is *actually* None.
758
is_unmodified = False
759
for lca_path, ie in lca_values:
760
if ie is not None and ie.revision == other_revision:
767
for lca_path, lca_ie in lca_values:
769
lca_entries.append(_none_entry)
771
lca_entries.append(lca_ie)
773
if file_id in base_inventory:
774
base_ie = base_inventory[file_id]
776
base_ie = _none_entry
778
if file_id in this_inventory:
779
this_ie = this_inventory[file_id]
781
this_ie = _none_entry
787
for lca_ie in lca_entries:
788
lca_kinds.append(lca_ie.kind)
789
lca_parent_ids.append(lca_ie.parent_id)
790
lca_names.append(lca_ie.name)
791
lca_executable.append(lca_ie.executable)
793
kind_winner = self._lca_multi_way(
794
(base_ie.kind, lca_kinds),
795
other_ie.kind, this_ie.kind)
796
parent_id_winner = self._lca_multi_way(
797
(base_ie.parent_id, lca_parent_ids),
798
other_ie.parent_id, this_ie.parent_id)
799
name_winner = self._lca_multi_way(
800
(base_ie.name, lca_names),
801
other_ie.name, this_ie.name)
803
content_changed = True
804
if kind_winner == 'this':
805
# No kind change in OTHER, see if there are *any* changes
806
if other_ie.kind == 'directory':
807
if parent_id_winner == 'this' and name_winner == 'this':
808
# No change for this directory in OTHER, skip
810
content_changed = False
811
elif other_ie.kind is None or other_ie.kind == 'file':
812
def get_sha1(ie, tree):
813
if ie.kind != 'file':
815
return tree.get_file_sha1(file_id)
816
base_sha1 = get_sha1(base_ie, self.base_tree)
817
lca_sha1s = [get_sha1(ie, tree) for ie, tree
818
in zip(lca_entries, self._lca_trees)]
819
this_sha1 = get_sha1(this_ie, self.this_tree)
820
other_sha1 = get_sha1(other_ie, self.other_tree)
821
sha1_winner = self._lca_multi_way(
822
(base_sha1, lca_sha1s), other_sha1, this_sha1,
823
allow_overriding_lca=False)
824
exec_winner = self._lca_multi_way(
825
(base_ie.executable, lca_executable),
826
other_ie.executable, this_ie.executable)
827
if (parent_id_winner == 'this' and name_winner == 'this'
828
and sha1_winner == 'this' and exec_winner == 'this'):
829
# No kind, parent, name, exec, or content change for
830
# OTHER, so this node is not considered interesting
832
if sha1_winner == 'this':
833
content_changed = False
834
elif other_ie.kind == 'symlink':
835
def get_target(ie, tree):
836
if ie.kind != 'symlink':
838
return tree.get_symlink_target(file_id)
839
base_target = get_target(base_ie, self.base_tree)
840
lca_targets = [get_target(ie, tree) for ie, tree
841
in zip(lca_entries, self._lca_trees)]
842
this_target = get_target(this_ie, self.this_tree)
843
other_target = get_target(other_ie, self.other_tree)
844
target_winner = self._lca_multi_way(
845
(base_target, lca_targets),
846
other_target, this_target)
847
if (parent_id_winner == 'this' and name_winner == 'this'
848
and target_winner == 'this'):
849
# No kind, parent, name, or symlink target change
852
if target_winner == 'this':
853
content_changed = False
854
elif other_ie.kind == 'tree-reference':
855
# The 'changed' information seems to be handled at a higher
856
# level. At least, _entries3 returns False for content
857
# changed, even when at a new revision_id.
858
content_changed = False
859
if (parent_id_winner == 'this' and name_winner == 'this'):
860
# Nothing interesting
863
raise AssertionError('unhandled kind: %s' % other_ie.kind)
864
# XXX: We need to handle kind == 'symlink'
866
# If we have gotten this far, that means something has changed
867
result.append((file_id, content_changed,
868
((base_ie.parent_id, lca_parent_ids),
869
other_ie.parent_id, this_ie.parent_id),
870
((base_ie.name, lca_names),
871
other_ie.name, this_ie.name),
872
((base_ie.executable, lca_executable),
873
other_ie.executable, this_ie.executable)
880
self.tt.final_kind(self.tt.root)
881
except errors.NoSuchFile:
882
self.tt.cancel_deletion(self.tt.root)
883
if self.tt.final_file_id(self.tt.root) is None:
884
self.tt.version_file(self.tt.tree_file_id(self.tt.root),
886
other_root_file_id = self.other_tree.get_root_id()
887
if other_root_file_id is None:
889
other_root = self.tt.trans_id_file_id(other_root_file_id)
890
if other_root == self.tt.root:
893
self.tt.final_kind(other_root)
894
except errors.NoSuchFile:
896
if self.other_tree.inventory.root.file_id in self.this_tree.inventory:
897
# the other tree's root is a non-root in the current tree
899
self.reparent_children(self.other_tree.inventory.root, self.tt.root)
900
self.tt.cancel_creation(other_root)
901
self.tt.cancel_versioning(other_root)
903
def reparent_children(self, ie, target):
904
for thing, child in ie.children.iteritems():
905
trans_id = self.tt.trans_id_file_id(child.file_id)
906
self.tt.adjust_path(self.tt.final_name(trans_id), target, trans_id)
908
def write_modified(self, results):
910
for path in results.modified_paths:
911
file_id = self.this_tree.path2id(self.this_tree.relpath(path))
914
hash = self.this_tree.get_file_sha1(file_id)
917
modified_hashes[file_id] = hash
918
self.this_tree.set_merge_modified(modified_hashes)
921
def parent(entry, file_id):
922
"""Determine the parent for a file_id (used as a key method)"""
925
return entry.parent_id
928
def name(entry, file_id):
929
"""Determine the name for a file_id (used as a key method)"""
935
def contents_sha1(tree, file_id):
936
"""Determine the sha1 of the file contents (used as a key method)."""
937
if file_id not in tree:
939
return tree.get_file_sha1(file_id)
942
def executable(tree, file_id):
943
"""Determine the executability of a file-id (used as a key method)."""
944
if file_id not in tree:
946
if tree.kind(file_id) != "file":
948
return tree.is_executable(file_id)
951
def kind(tree, file_id):
952
"""Determine the kind of a file-id (used as a key method)."""
953
if file_id not in tree:
955
return tree.kind(file_id)
958
def _three_way(base, other, this):
959
#if base == other, either they all agree, or only THIS has changed.
962
elif this not in (base, other):
964
# "Ambiguous clean merge" -- both sides have made the same change.
967
# this == base: only other has changed.
972
def _lca_multi_way(bases, other, this, allow_overriding_lca=True):
973
"""Consider LCAs when determining whether a change has occurred.
975
If LCAS are all identical, this is the same as a _three_way comparison.
977
:param bases: value in (BASE, [LCAS])
978
:param other: value in OTHER
979
:param this: value in THIS
980
:param allow_overriding_lca: If there is more than one unique lca
981
value, allow OTHER to override THIS if it has a new value, and
982
THIS only has an lca value, or vice versa. This is appropriate for
983
truly scalar values, not as much for non-scalars.
984
:return: 'this', 'other', or 'conflict' depending on whether an entry
987
# See doc/developers/lca_tree_merging.txt for details about this
990
# Either Ambiguously clean, or nothing was actually changed. We
993
base_val, lca_vals = bases
994
# Remove 'base_val' from the lca_vals, because it is not interesting
995
filtered_lca_vals = [lca_val for lca_val in lca_vals
996
if lca_val != base_val]
997
if len(filtered_lca_vals) == 0:
998
return Merge3Merger._three_way(base_val, other, this)
1000
unique_lca_vals = set(filtered_lca_vals)
1001
if len(unique_lca_vals) == 1:
1002
return Merge3Merger._three_way(unique_lca_vals.pop(), other, this)
1004
if allow_overriding_lca:
1005
if other in unique_lca_vals:
1006
if this in unique_lca_vals:
1007
# Each side picked a different lca, conflict
1010
# This has a value which supersedes both lca values, and
1011
# other only has an lca value
1013
elif this in unique_lca_vals:
1014
# OTHER has a value which supersedes both lca values, and this
1015
# only has an lca value
1018
# At this point, the lcas disagree, and the tips disagree
1022
def scalar_three_way(this_tree, base_tree, other_tree, file_id, key):
1023
"""Do a three-way test on a scalar.
1024
Return "this", "other" or "conflict", depending whether a value wins.
1026
key_base = key(base_tree, file_id)
1027
key_other = key(other_tree, file_id)
1028
#if base == other, either they all agree, or only THIS has changed.
1029
if key_base == key_other:
1031
key_this = key(this_tree, file_id)
1032
# "Ambiguous clean merge"
1033
if key_this == key_other:
1035
elif key_this == key_base:
1040
def merge_names(self, file_id):
1041
def get_entry(tree):
1042
if file_id in tree.inventory:
1043
return tree.inventory[file_id]
1046
this_entry = get_entry(self.this_tree)
1047
other_entry = get_entry(self.other_tree)
1048
base_entry = get_entry(self.base_tree)
1049
entries = (base_entry, other_entry, this_entry)
1052
for entry in entries:
1055
parents.append(None)
1057
names.append(entry.name)
1058
parents.append(entry.parent_id)
1059
return self._merge_names(file_id, parents, names,
1060
resolver=self._three_way)
1062
def _merge_names(self, file_id, parents, names, resolver):
1063
"""Perform a merge on file_id names and parents"""
1064
base_name, other_name, this_name = names
1065
base_parent, other_parent, this_parent = parents
1067
name_winner = resolver(*names)
1069
parent_id_winner = resolver(*parents)
1070
if this_name is None:
1071
if name_winner == "this":
1072
name_winner = "other"
1073
if parent_id_winner == "this":
1074
parent_id_winner = "other"
1075
if name_winner == "this" and parent_id_winner == "this":
1077
if name_winner == "conflict":
1078
trans_id = self.tt.trans_id_file_id(file_id)
1079
self._raw_conflicts.append(('name conflict', trans_id,
1080
this_name, other_name))
1081
if parent_id_winner == "conflict":
1082
trans_id = self.tt.trans_id_file_id(file_id)
1083
self._raw_conflicts.append(('parent conflict', trans_id,
1084
this_parent, other_parent))
1085
if other_name is None:
1086
# it doesn't matter whether the result was 'other' or
1087
# 'conflict'-- if there's no 'other', we leave it alone.
1089
# if we get here, name_winner and parent_winner are set to safe values.
1090
trans_id = self.tt.trans_id_file_id(file_id)
1091
parent_id = parents[self.winner_idx[parent_id_winner]]
1092
if parent_id is not None:
1093
parent_trans_id = self.tt.trans_id_file_id(parent_id)
1094
self.tt.adjust_path(names[self.winner_idx[name_winner]],
1095
parent_trans_id, trans_id)
1097
def merge_contents(self, file_id):
1098
"""Performs a merge on file_id contents."""
1099
def contents_pair(tree):
1100
if file_id not in tree:
1102
kind = tree.kind(file_id)
1104
contents = tree.get_file_sha1(file_id)
1105
elif kind == "symlink":
1106
contents = tree.get_symlink_target(file_id)
1109
return kind, contents
1111
def contents_conflict():
1112
trans_id = self.tt.trans_id_file_id(file_id)
1113
name = self.tt.final_name(trans_id)
1114
parent_id = self.tt.final_parent(trans_id)
1115
if file_id in self.this_tree.inventory:
1116
self.tt.unversion_file(trans_id)
1117
if file_id in self.this_tree:
1118
self.tt.delete_contents(trans_id)
1119
file_group = self._dump_conflicts(name, parent_id, file_id,
1121
self._raw_conflicts.append(('contents conflict', file_group))
1123
# See SPOT run. run, SPOT, run.
1124
# So we're not QUITE repeating ourselves; we do tricky things with
1126
base_pair = contents_pair(self.base_tree)
1127
other_pair = contents_pair(self.other_tree)
1129
this_pair = contents_pair(self.this_tree)
1130
lca_pairs = [contents_pair(tree) for tree in self._lca_trees]
1131
winner = self._lca_multi_way((base_pair, lca_pairs), other_pair,
1132
this_pair, allow_overriding_lca=False)
1134
if base_pair == other_pair:
1137
# We delayed evaluating this_pair as long as we can to avoid
1138
# unnecessary sha1 calculation
1139
this_pair = contents_pair(self.this_tree)
1140
winner = self._three_way(base_pair, other_pair, this_pair)
1141
if winner == 'this':
1142
# No interesting changes introduced by OTHER
1144
trans_id = self.tt.trans_id_file_id(file_id)
1145
if winner == 'other':
1146
# OTHER is a straight winner, so replace this contents with other
1147
file_in_this = file_id in self.this_tree
1149
# Remove any existing contents
1150
self.tt.delete_contents(trans_id)
1151
if file_id in self.other_tree:
1152
# OTHER changed the file
1153
transform.create_from_tree(self.tt, trans_id,
1154
self.other_tree, file_id)
1155
if not file_in_this:
1156
self.tt.version_file(file_id, trans_id)
1159
# OTHER deleted the file
1160
self.tt.unversion_file(trans_id)
1163
# We have a hypothetical conflict, but if we have files, then we
1164
# can try to merge the content
1165
if this_pair[0] == 'file' and other_pair[0] == 'file':
1166
# THIS and OTHER are both files, so text merge. Either
1167
# BASE is a file, or both converted to files, so at least we
1168
# have agreement that output should be a file.
1170
self.text_merge(file_id, trans_id)
1171
except errors.BinaryFile:
1172
return contents_conflict()
1173
if file_id not in self.this_tree:
1174
self.tt.version_file(file_id, trans_id)
1176
self.tt.tree_kind(trans_id)
1177
self.tt.delete_contents(trans_id)
1178
except errors.NoSuchFile:
1182
return contents_conflict()
1184
def get_lines(self, tree, file_id):
1185
"""Return the lines in a file, or an empty list."""
1187
return tree.get_file(file_id).readlines()
1191
def text_merge(self, file_id, trans_id):
1192
"""Perform a three-way text merge on a file_id"""
1193
# it's possible that we got here with base as a different type.
1194
# if so, we just want two-way text conflicts.
1195
if file_id in self.base_tree and \
1196
self.base_tree.kind(file_id) == "file":
1197
base_lines = self.get_lines(self.base_tree, file_id)
1200
other_lines = self.get_lines(self.other_tree, file_id)
1201
this_lines = self.get_lines(self.this_tree, file_id)
1202
m3 = merge3.Merge3(base_lines, this_lines, other_lines,
1203
is_cherrypick=self.cherrypick)
1204
start_marker = "!START OF MERGE CONFLICT!" + "I HOPE THIS IS UNIQUE"
1205
if self.show_base is True:
1206
base_marker = '|' * 7
1210
def iter_merge3(retval):
1211
retval["text_conflicts"] = False
1212
for line in m3.merge_lines(name_a = "TREE",
1213
name_b = "MERGE-SOURCE",
1214
name_base = "BASE-REVISION",
1215
start_marker=start_marker,
1216
base_marker=base_marker,
1217
reprocess=self.reprocess):
1218
if line.startswith(start_marker):
1219
retval["text_conflicts"] = True
1220
yield line.replace(start_marker, '<' * 7)
1224
merge3_iterator = iter_merge3(retval)
1225
self.tt.create_file(merge3_iterator, trans_id)
1226
if retval["text_conflicts"] is True:
1227
self._raw_conflicts.append(('text conflict', trans_id))
1228
name = self.tt.final_name(trans_id)
1229
parent_id = self.tt.final_parent(trans_id)
1230
file_group = self._dump_conflicts(name, parent_id, file_id,
1231
this_lines, base_lines,
1233
file_group.append(trans_id)
1235
def _dump_conflicts(self, name, parent_id, file_id, this_lines=None,
1236
base_lines=None, other_lines=None, set_version=False,
1238
"""Emit conflict files.
1239
If this_lines, base_lines, or other_lines are omitted, they will be
1240
determined automatically. If set_version is true, the .OTHER, .THIS
1241
or .BASE (in that order) will be created as versioned files.
1243
data = [('OTHER', self.other_tree, other_lines),
1244
('THIS', self.this_tree, this_lines)]
1246
data.append(('BASE', self.base_tree, base_lines))
1249
for suffix, tree, lines in data:
1251
trans_id = self._conflict_file(name, parent_id, tree, file_id,
1253
file_group.append(trans_id)
1254
if set_version and not versioned:
1255
self.tt.version_file(file_id, trans_id)
1259
def _conflict_file(self, name, parent_id, tree, file_id, suffix,
1261
"""Emit a single conflict file."""
1262
name = name + '.' + suffix
1263
trans_id = self.tt.create_path(name, parent_id)
1264
transform.create_from_tree(self.tt, trans_id, tree, file_id, lines)
1267
def merge_executable(self, file_id, file_status):
1268
"""Perform a merge on the execute bit."""
1269
executable = [self.executable(t, file_id) for t in (self.base_tree,
1270
self.other_tree, self.this_tree)]
1271
self._merge_executable(file_id, executable, file_status,
1272
resolver=self._three_way)
1274
def _merge_executable(self, file_id, executable, file_status,
1276
"""Perform a merge on the execute bit."""
1277
base_executable, other_executable, this_executable = executable
1278
if file_status == "deleted":
1280
winner = resolver(*executable)
1281
if winner == "conflict":
1282
# There must be a None in here, if we have a conflict, but we
1283
# need executability since file status was not deleted.
1284
if self.executable(self.other_tree, file_id) is None:
1288
if winner == 'this' and file_status != "modified":
1290
trans_id = self.tt.trans_id_file_id(file_id)
1292
if self.tt.final_kind(trans_id) != "file":
1294
except errors.NoSuchFile:
1296
if winner == "this":
1297
executability = this_executable
1299
if file_id in self.other_tree:
1300
executability = other_executable
1301
elif file_id in self.this_tree:
1302
executability = this_executable
1303
elif file_id in self.base_tree:
1304
executability = base_executable
1305
if executability is not None:
1306
trans_id = self.tt.trans_id_file_id(file_id)
1307
self.tt.set_executability(executability, trans_id)
1309
def cook_conflicts(self, fs_conflicts):
1310
"""Convert all conflicts into a form that doesn't depend on trans_id"""
1312
self.cooked_conflicts.extend(transform.cook_conflicts(
1313
fs_conflicts, self.tt))
1314
fp = transform.FinalPaths(self.tt)
1315
for conflict in self._raw_conflicts:
1316
conflict_type = conflict[0]
1317
if conflict_type in ('name conflict', 'parent conflict'):
1318
trans_id = conflict[1]
1319
conflict_args = conflict[2:]
1320
if trans_id not in name_conflicts:
1321
name_conflicts[trans_id] = {}
1322
transform.unique_add(name_conflicts[trans_id], conflict_type,
1324
if conflict_type == 'contents conflict':
1325
for trans_id in conflict[1]:
1326
file_id = self.tt.final_file_id(trans_id)
214
1327
if file_id is not None:
215
interesting_ids.add(file_id)
218
raise BzrCommandError("%s is not a source file in any"
220
merge_inner(this_branch, other_tree, base_tree, tempdir,
221
ignore_zero=ignore_zero, backup_files=backup_files,
222
merge_type=merge_type, interesting_ids=interesting_ids)
224
shutil.rmtree(tempdir)
227
def set_interesting(inventory_a, inventory_b, interesting_ids):
228
"""Mark files whose ids are in interesting_ids as interesting
230
for inventory in (inventory_a, inventory_b):
231
for path, source_file in inventory.iteritems():
232
source_file.interesting = source_file.id in interesting_ids
235
def set_optimized(tree_a, tree_b, inventory_a, inventory_b):
236
"""Mark files that have changed texts as interesting
238
for file_id in tree_a.tree.inventory:
239
if file_id not in tree_b.tree.inventory:
241
entry_a = tree_a.tree.inventory[file_id]
242
entry_b = tree_b.tree.inventory[file_id]
243
if (entry_a.kind, entry_b.kind) != ("file", "file"):
245
if None in (entry_a.text_id, entry_b.text_id):
247
if entry_a.text_id != entry_b.text_id:
249
inventory_a[abspath(tree_a.tree, file_id)].interesting = False
250
inventory_b[abspath(tree_b.tree, file_id)].interesting = False
253
def generate_cset_optimized(tree_a, tree_b, inventory_a, inventory_b,
254
interesting_ids=None):
255
"""Generate a changeset, with preprocessing to select interesting files.
256
using the text_id to mark really-changed files.
257
This permits blazing comparisons when text_ids are present. It also
258
disables metadata comparison for files with identical texts.
260
if interesting_ids is None:
261
set_optimized(tree_a, tree_b, inventory_a, inventory_b)
263
set_interesting(inventory_a, inventory_b, interesting_ids)
264
cset = generate_changeset(tree_a, tree_b, inventory_a, inventory_b)
265
for entry in cset.entries.itervalues():
266
entry.metadata_change = None
270
def merge_inner(this_branch, other_tree, base_tree, tempdir,
271
ignore_zero=False, merge_type=ApplyMerge3, backup_files=False,
272
interesting_ids=None):
274
def merge_factory(base_file, other_file):
275
contents_change = merge_type(base_file, other_file)
277
contents_change = BackupBeforeChange(contents_change)
278
return contents_change
280
def generate_cset(tree_a, tree_b, inventory_a, inventory_b):
281
return generate_cset_optimized(tree_a, tree_b, inventory_a, inventory_b,
284
this_tree = get_tree((this_branch.base, None), tempdir, "this")[1]
286
def get_inventory(tree):
287
return tree.inventory
289
inv_changes = merge_flex(this_tree, base_tree, other_tree,
290
generate_cset, get_inventory,
291
MergeConflictHandler(base_tree.root,
292
ignore_zero=ignore_zero),
293
merge_factory=merge_factory)
296
for id, path in inv_changes.iteritems():
301
assert path.startswith('./')
303
adjust_ids.append((path, id))
304
this_branch.set_inventory(regen_inventory(this_branch, this_tree.root, adjust_ids))
307
def regen_inventory(this_branch, root, new_entries):
308
old_entries = this_branch.read_working_inventory()
311
for file_id in old_entries:
312
entry = old_entries[file_id]
313
path = old_entries.id2path(file_id)
314
new_inventory[file_id] = (path, file_id, entry.parent_id, entry.kind)
315
by_path[path] = file_id
320
for path, file_id in new_entries:
322
del new_inventory[file_id]
325
new_path_list.append((path, file_id))
326
if file_id not in old_entries:
328
# Ensure no file is added before its parent
330
for path, file_id in new_path_list:
334
parent = by_path[os.path.dirname(path)]
335
kind = bzrlib.osutils.file_kind(os.path.join(root, path))
336
new_inventory[file_id] = (path, file_id, parent, kind)
337
by_path[path] = file_id
339
# Get a list in insertion order
340
new_inventory_list = new_inventory.values()
341
mutter ("""Inventory regeneration:
342
old length: %i insertions: %i deletions: %i new_length: %i"""\
343
% (len(old_entries), insertions, deletions, len(new_inventory_list)))
344
assert len(new_inventory_list) == len(old_entries) + insertions - deletions
345
new_inventory_list.sort()
346
return new_inventory_list
348
merge_types = { "merge3": (ApplyMerge3, "Native diff3-style merge"),
349
"diff3": (Diff3Merge, "Merge using external diff3")
1329
path = fp.get_path(trans_id)
1330
for suffix in ('.BASE', '.THIS', '.OTHER'):
1331
if path.endswith(suffix):
1332
path = path[:-len(suffix)]
1334
c = _mod_conflicts.Conflict.factory(conflict_type,
1335
path=path, file_id=file_id)
1336
self.cooked_conflicts.append(c)
1337
if conflict_type == 'text conflict':
1338
trans_id = conflict[1]
1339
path = fp.get_path(trans_id)
1340
file_id = self.tt.final_file_id(trans_id)
1341
c = _mod_conflicts.Conflict.factory(conflict_type,
1342
path=path, file_id=file_id)
1343
self.cooked_conflicts.append(c)
1345
for trans_id, conflicts in name_conflicts.iteritems():
1347
this_parent, other_parent = conflicts['parent conflict']
1348
if this_parent == other_parent:
1349
raise AssertionError()
1351
this_parent = other_parent = \
1352
self.tt.final_file_id(self.tt.final_parent(trans_id))
1354
this_name, other_name = conflicts['name conflict']
1355
if this_name == other_name:
1356
raise AssertionError()
1358
this_name = other_name = self.tt.final_name(trans_id)
1359
other_path = fp.get_path(trans_id)
1360
if this_parent is not None and this_name is not None:
1361
this_parent_path = \
1362
fp.get_path(self.tt.trans_id_file_id(this_parent))
1363
this_path = osutils.pathjoin(this_parent_path, this_name)
1365
this_path = "<deleted>"
1366
file_id = self.tt.final_file_id(trans_id)
1367
c = _mod_conflicts.Conflict.factory('path conflict', path=this_path,
1368
conflict_path=other_path,
1370
self.cooked_conflicts.append(c)
1371
self.cooked_conflicts.sort(key=_mod_conflicts.Conflict.sort_key)
1374
class WeaveMerger(Merge3Merger):
1375
"""Three-way tree merger, text weave merger."""
1376
supports_reprocess = True
1377
supports_show_base = False
1378
supports_reverse_cherrypick = False
1379
history_based = True
1381
def _merged_lines(self, file_id):
1382
"""Generate the merged lines.
1383
There is no distinction between lines that are meant to contain <<<<<<<
1387
base = self.base_tree
1390
plan = self.this_tree.plan_file_merge(file_id, self.other_tree,
1392
if 'merge' in debug.debug_flags:
1394
trans_id = self.tt.trans_id_file_id(file_id)
1395
name = self.tt.final_name(trans_id) + '.plan'
1396
contents = ('%10s|%s' % l for l in plan)
1397
self.tt.new_file(name, self.tt.final_parent(trans_id), contents)
1398
textmerge = versionedfile.PlanWeaveMerge(plan, '<<<<<<< TREE\n',
1399
'>>>>>>> MERGE-SOURCE\n')
1400
return textmerge.merge_lines(self.reprocess)
1402
def text_merge(self, file_id, trans_id):
1403
"""Perform a (weave) text merge for a given file and file-id.
1404
If conflicts are encountered, .THIS and .OTHER files will be emitted,
1405
and a conflict will be noted.
1407
lines, conflicts = self._merged_lines(file_id)
1409
# Note we're checking whether the OUTPUT is binary in this case,
1410
# because we don't want to get into weave merge guts.
1411
textfile.check_text_lines(lines)
1412
self.tt.create_file(lines, trans_id)
1414
self._raw_conflicts.append(('text conflict', trans_id))
1415
name = self.tt.final_name(trans_id)
1416
parent_id = self.tt.final_parent(trans_id)
1417
file_group = self._dump_conflicts(name, parent_id, file_id,
1419
file_group.append(trans_id)
1422
class LCAMerger(WeaveMerger):
1424
def _merged_lines(self, file_id):
1425
"""Generate the merged lines.
1426
There is no distinction between lines that are meant to contain <<<<<<<
1430
base = self.base_tree
1433
plan = self.this_tree.plan_file_lca_merge(file_id, self.other_tree,
1435
if 'merge' in debug.debug_flags:
1437
trans_id = self.tt.trans_id_file_id(file_id)
1438
name = self.tt.final_name(trans_id) + '.plan'
1439
contents = ('%10s|%s' % l for l in plan)
1440
self.tt.new_file(name, self.tt.final_parent(trans_id), contents)
1441
textmerge = versionedfile.PlanWeaveMerge(plan, '<<<<<<< TREE\n',
1442
'>>>>>>> MERGE-SOURCE\n')
1443
return textmerge.merge_lines(self.reprocess)
1446
class Diff3Merger(Merge3Merger):
1447
"""Three-way merger using external diff3 for text merging"""
1449
def dump_file(self, temp_dir, name, tree, file_id):
1450
out_path = osutils.pathjoin(temp_dir, name)
1451
out_file = open(out_path, "wb")
1453
in_file = tree.get_file(file_id)
1454
for line in in_file:
1455
out_file.write(line)
1460
def text_merge(self, file_id, trans_id):
1461
"""Perform a diff3 merge using a specified file-id and trans-id.
1462
If conflicts are encountered, .BASE, .THIS. and .OTHER conflict files
1463
will be dumped, and a will be conflict noted.
1466
temp_dir = osutils.mkdtemp(prefix="bzr-")
1468
new_file = osutils.pathjoin(temp_dir, "new")
1469
this = self.dump_file(temp_dir, "this", self.this_tree, file_id)
1470
base = self.dump_file(temp_dir, "base", self.base_tree, file_id)
1471
other = self.dump_file(temp_dir, "other", self.other_tree, file_id)
1472
status = bzrlib.patch.diff3(new_file, this, base, other)
1473
if status not in (0, 1):
1474
raise errors.BzrError("Unhandled diff3 exit code")
1475
f = open(new_file, 'rb')
1477
self.tt.create_file(f, trans_id)
1481
name = self.tt.final_name(trans_id)
1482
parent_id = self.tt.final_parent(trans_id)
1483
self._dump_conflicts(name, parent_id, file_id)
1484
self._raw_conflicts.append(('text conflict', trans_id))
1486
osutils.rmtree(temp_dir)
1489
def merge_inner(this_branch, other_tree, base_tree, ignore_zero=False,
1491
merge_type=Merge3Merger,
1492
interesting_ids=None,
1496
interesting_files=None,
1498
pb=progress.DummyProgress(),
1499
change_reporter=None):
1500
"""Primary interface for merging.
1502
typical use is probably
1503
'merge_inner(branch, branch.get_revision_tree(other_revision),
1504
branch.get_revision_tree(base_revision))'
1506
if this_tree is None:
1507
raise errors.BzrError("bzrlib.merge.merge_inner requires a this_tree "
1508
"parameter as of bzrlib version 0.8.")
1509
merger = Merger(this_branch, other_tree, base_tree, this_tree=this_tree,
1510
pb=pb, change_reporter=change_reporter)
1511
merger.backup_files = backup_files
1512
merger.merge_type = merge_type
1513
merger.interesting_ids = interesting_ids
1514
merger.ignore_zero = ignore_zero
1515
if interesting_files:
1517
raise ValueError('Only supply interesting_ids'
1518
' or interesting_files')
1519
merger.interesting_files = interesting_files
1520
merger.show_base = show_base
1521
merger.reprocess = reprocess
1522
merger.other_rev_id = other_rev_id
1523
merger.other_basis = other_rev_id
1524
get_revision_id = getattr(base_tree, 'get_revision_id', None)
1525
if get_revision_id is None:
1526
get_revision_id = base_tree.last_revision
1527
merger.cache_trees_with_revision_ids([other_tree, base_tree, this_tree])
1528
merger.set_base_revision(get_revision_id(), this_branch)
1529
return merger.do_merge()
1531
def get_merge_type_registry():
1532
"""Merge type registry is in bzrlib.option to avoid circular imports.
1534
This method provides a sanctioned way to retrieve it.
1536
from bzrlib import option
1537
return option._merge_type_registry
1540
def _plan_annotate_merge(annotated_a, annotated_b, ancestors_a, ancestors_b):
1541
def status_a(revision, text):
1542
if revision in ancestors_b:
1543
return 'killed-b', text
1545
return 'new-a', text
1547
def status_b(revision, text):
1548
if revision in ancestors_a:
1549
return 'killed-a', text
1551
return 'new-b', text
1553
plain_a = [t for (a, t) in annotated_a]
1554
plain_b = [t for (a, t) in annotated_b]
1555
matcher = patiencediff.PatienceSequenceMatcher(None, plain_a, plain_b)
1556
blocks = matcher.get_matching_blocks()
1559
for ai, bi, l in blocks:
1560
# process all mismatched sections
1561
# (last mismatched section is handled because blocks always
1562
# includes a 0-length last block)
1563
for revision, text in annotated_a[a_cur:ai]:
1564
yield status_a(revision, text)
1565
for revision, text in annotated_b[b_cur:bi]:
1566
yield status_b(revision, text)
1567
# and now the matched section
1570
for text_a in plain_a[ai:a_cur]:
1571
yield "unchanged", text_a
1574
class _PlanMergeBase(object):
1576
def __init__(self, a_rev, b_rev, vf, key_prefix):
1579
:param a_rev: Revision-id of one revision to merge
1580
:param b_rev: Revision-id of the other revision to merge
1581
:param vf: A VersionedFiles containing both revisions
1582
:param key_prefix: A prefix for accessing keys in vf, typically
1588
self._last_lines = None
1589
self._last_lines_revision_id = None
1590
self._cached_matching_blocks = {}
1591
self._key_prefix = key_prefix
1592
self._precache_tip_lines()
1594
def _precache_tip_lines(self):
1595
lines = self.get_lines([self.a_rev, self.b_rev])
1596
self.lines_a = lines[self.a_rev]
1597
self.lines_b = lines[self.b_rev]
1599
def get_lines(self, revisions):
1600
"""Get lines for revisions from the backing VersionedFiles.
1602
:raises RevisionNotPresent: on absent texts.
1604
keys = [(self._key_prefix + (rev,)) for rev in revisions]
1606
for record in self.vf.get_record_stream(keys, 'unordered', True):
1607
if record.storage_kind == 'absent':
1608
raise errors.RevisionNotPresent(record.key, self.vf)
1609
result[record.key[-1]] = osutils.chunks_to_lines(
1610
record.get_bytes_as('chunked'))
1613
def plan_merge(self):
1614
"""Generate a 'plan' for merging the two revisions.
1616
This involves comparing their texts and determining the cause of
1617
differences. If text A has a line and text B does not, then either the
1618
line was added to text A, or it was deleted from B. Once the causes
1619
are combined, they are written out in the format described in
1620
VersionedFile.plan_merge
1622
blocks = self._get_matching_blocks(self.a_rev, self.b_rev)
1623
unique_a, unique_b = self._unique_lines(blocks)
1624
new_a, killed_b = self._determine_status(self.a_rev, unique_a)
1625
new_b, killed_a = self._determine_status(self.b_rev, unique_b)
1626
return self._iter_plan(blocks, new_a, killed_b, new_b, killed_a)
1628
def _iter_plan(self, blocks, new_a, killed_b, new_b, killed_a):
1631
for i, j, n in blocks:
1632
for a_index in range(last_i, i):
1633
if a_index in new_a:
1634
if a_index in killed_b:
1635
yield 'conflicted-a', self.lines_a[a_index]
1637
yield 'new-a', self.lines_a[a_index]
1639
yield 'killed-b', self.lines_a[a_index]
1640
for b_index in range(last_j, j):
1641
if b_index in new_b:
1642
if b_index in killed_a:
1643
yield 'conflicted-b', self.lines_b[b_index]
1645
yield 'new-b', self.lines_b[b_index]
1647
yield 'killed-a', self.lines_b[b_index]
1648
# handle common lines
1649
for a_index in range(i, i+n):
1650
yield 'unchanged', self.lines_a[a_index]
1654
def _get_matching_blocks(self, left_revision, right_revision):
1655
"""Return a description of which sections of two revisions match.
1657
See SequenceMatcher.get_matching_blocks
1659
cached = self._cached_matching_blocks.get((left_revision,
1661
if cached is not None:
1663
if self._last_lines_revision_id == left_revision:
1664
left_lines = self._last_lines
1665
right_lines = self.get_lines([right_revision])[right_revision]
1667
lines = self.get_lines([left_revision, right_revision])
1668
left_lines = lines[left_revision]
1669
right_lines = lines[right_revision]
1670
self._last_lines = right_lines
1671
self._last_lines_revision_id = right_revision
1672
matcher = patiencediff.PatienceSequenceMatcher(None, left_lines,
1674
return matcher.get_matching_blocks()
1676
def _unique_lines(self, matching_blocks):
1677
"""Analyse matching_blocks to determine which lines are unique
1679
:return: a tuple of (unique_left, unique_right), where the values are
1680
sets of line numbers of unique lines.
1686
for i, j, n in matching_blocks:
1687
unique_left.extend(range(last_i, i))
1688
unique_right.extend(range(last_j, j))
1691
return unique_left, unique_right
1694
def _subtract_plans(old_plan, new_plan):
1695
"""Remove changes from new_plan that came from old_plan.
1697
It is assumed that the difference between the old_plan and new_plan
1698
is their choice of 'b' text.
1700
All lines from new_plan that differ from old_plan are emitted
1701
verbatim. All lines from new_plan that match old_plan but are
1702
not about the 'b' revision are emitted verbatim.
1704
Lines that match and are about the 'b' revision are the lines we
1705
don't want, so we convert 'killed-b' -> 'unchanged', and 'new-b'
1706
is skipped entirely.
1708
matcher = patiencediff.PatienceSequenceMatcher(None, old_plan,
1711
for i, j, n in matcher.get_matching_blocks():
1712
for jj in range(last_j, j):
1714
for jj in range(j, j+n):
1715
plan_line = new_plan[jj]
1716
if plan_line[0] == 'new-b':
1718
elif plan_line[0] == 'killed-b':
1719
yield 'unchanged', plan_line[1]
1725
class _PlanMerge(_PlanMergeBase):
1726
"""Plan an annotate merge using on-the-fly annotation"""
1728
def __init__(self, a_rev, b_rev, vf, key_prefix):
1729
super(_PlanMerge, self).__init__(a_rev, b_rev, vf, key_prefix)
1730
self.a_key = self._key_prefix + (self.a_rev,)
1731
self.b_key = self._key_prefix + (self.b_rev,)
1732
self.graph = _mod_graph.Graph(self.vf)
1733
heads = self.graph.heads((self.a_key, self.b_key))
1735
# one side dominates, so we can just return its values, yay for
1737
# Ideally we would know that before we get this far
1738
self._head_key = heads.pop()
1739
if self._head_key == self.a_key:
1743
trace.mutter('found dominating revision for %s\n%s > %s', self.vf,
1744
self._head_key[-1], other)
1747
self._head_key = None
1750
def _precache_tip_lines(self):
1751
# Turn this into a no-op, because we will do this later
1754
def _find_recursive_lcas(self):
1755
"""Find all the ancestors back to a unique lca"""
1756
cur_ancestors = (self.a_key, self.b_key)
1757
# graph.find_lca(uncommon, keys) now returns plain NULL_REVISION,
1758
# rather than a key tuple. We will just map that directly to no common
1762
next_lcas = self.graph.find_lca(*cur_ancestors)
1763
# Map a plain NULL_REVISION to a simple no-ancestors
1764
if next_lcas == set([_mod_revision.NULL_REVISION]):
1766
# Order the lca's based on when they were merged into the tip
1767
# While the actual merge portion of weave merge uses a set() of
1768
# active revisions, the order of insertion *does* effect the
1769
# implicit ordering of the texts.
1770
for rev_key in cur_ancestors:
1771
ordered_parents = tuple(self.graph.find_merge_order(rev_key,
1773
parent_map[rev_key] = ordered_parents
1774
if len(next_lcas) == 0:
1776
elif len(next_lcas) == 1:
1777
parent_map[list(next_lcas)[0]] = ()
1779
elif len(next_lcas) > 2:
1780
# More than 2 lca's, fall back to grabbing all nodes between
1781
# this and the unique lca.
1782
trace.mutter('More than 2 LCAs, falling back to all nodes for:'
1784
self.a_key, self.b_key, cur_ancestors)
1785
cur_lcas = next_lcas
1786
while len(cur_lcas) > 1:
1787
cur_lcas = self.graph.find_lca(*cur_lcas)
1788
if len(cur_lcas) == 0:
1789
# No common base to find, use the full ancestry
1792
unique_lca = list(cur_lcas)[0]
1793
if unique_lca == _mod_revision.NULL_REVISION:
1794
# find_lca will return a plain 'NULL_REVISION' rather
1795
# than a key tuple when there is no common ancestor, we
1796
# prefer to just use None, because it doesn't confuse
1797
# _get_interesting_texts()
1799
parent_map.update(self._find_unique_parents(next_lcas,
1802
cur_ancestors = next_lcas
1805
def _find_unique_parents(self, tip_keys, base_key):
1806
"""Find ancestors of tip that aren't ancestors of base.
1808
:param tip_keys: Nodes that are interesting
1809
:param base_key: Cull all ancestors of this node
1810
:return: The parent map for all revisions between tip_keys and
1811
base_key. base_key will be included. References to nodes outside of
1812
the ancestor set will also be removed.
1814
# TODO: this would be simpler if find_unique_ancestors took a list
1815
# instead of a single tip, internally it supports it, but it
1816
# isn't a "backwards compatible" api change.
1817
if base_key is None:
1818
parent_map = dict(self.graph.iter_ancestry(tip_keys))
1819
# We remove NULL_REVISION because it isn't a proper tuple key, and
1820
# thus confuses things like _get_interesting_texts, and our logic
1821
# to add the texts into the memory weave.
1822
if _mod_revision.NULL_REVISION in parent_map:
1823
parent_map.pop(_mod_revision.NULL_REVISION)
1826
for tip in tip_keys:
1828
self.graph.find_unique_ancestors(tip, [base_key]))
1829
parent_map = self.graph.get_parent_map(interesting)
1830
parent_map[base_key] = ()
1831
culled_parent_map, child_map, tails = self._remove_external_references(
1833
# Remove all the tails but base_key
1834
if base_key is not None:
1835
tails.remove(base_key)
1836
self._prune_tails(culled_parent_map, child_map, tails)
1837
# Now remove all the uninteresting 'linear' regions
1838
simple_map = _mod_graph.collapse_linear_regions(culled_parent_map)
1842
def _remove_external_references(parent_map):
1843
"""Remove references that go outside of the parent map.
1845
:param parent_map: Something returned from Graph.get_parent_map(keys)
1846
:return: (filtered_parent_map, child_map, tails)
1847
filtered_parent_map is parent_map without external references
1848
child_map is the {parent_key: [child_keys]} mapping
1849
tails is a list of nodes that do not have any parents in the map
1851
# TODO: The basic effect of this function seems more generic than
1852
# _PlanMerge. But the specific details of building a child_map,
1853
# and computing tails seems very specific to _PlanMerge.
1854
# Still, should this be in Graph land?
1855
filtered_parent_map = {}
1858
for key, parent_keys in parent_map.iteritems():
1859
culled_parent_keys = [p for p in parent_keys if p in parent_map]
1860
if not culled_parent_keys:
1862
for parent_key in culled_parent_keys:
1863
child_map.setdefault(parent_key, []).append(key)
1864
# TODO: Do we want to do this, it adds overhead for every node,
1865
# just to say that the node has no children
1866
child_map.setdefault(key, [])
1867
filtered_parent_map[key] = culled_parent_keys
1868
return filtered_parent_map, child_map, tails
1871
def _prune_tails(parent_map, child_map, tails_to_remove):
1872
"""Remove tails from the parent map.
1874
This will remove the supplied revisions until no more children have 0
1877
:param parent_map: A dict of {child: [parents]}, this dictionary will
1878
be modified in place.
1879
:param tails_to_remove: A list of tips that should be removed,
1880
this list will be consumed
1881
:param child_map: The reverse dict of parent_map ({parent: [children]})
1882
this dict will be modified
1883
:return: None, parent_map will be modified in place.
1885
while tails_to_remove:
1886
next = tails_to_remove.pop()
1887
parent_map.pop(next)
1888
children = child_map.pop(next)
1889
for child in children:
1890
child_parents = parent_map[child]
1891
child_parents.remove(next)
1892
if len(child_parents) == 0:
1893
tails_to_remove.append(child)
1895
def _get_interesting_texts(self, parent_map):
1896
"""Return a dict of texts we are interested in.
1898
Note that the input is in key tuples, but the output is in plain
1901
:param parent_map: The output from _find_recursive_lcas
1902
:return: A dict of {'revision_id':lines} as returned by
1903
_PlanMergeBase.get_lines()
1905
all_revision_keys = set(parent_map)
1906
all_revision_keys.add(self.a_key)
1907
all_revision_keys.add(self.b_key)
1909
# Everything else is in 'keys' but get_lines is in 'revision_ids'
1910
all_texts = self.get_lines([k[-1] for k in all_revision_keys])
1913
def _build_weave(self):
1914
from bzrlib import weave
1915
self._weave = weave.Weave(weave_name='in_memory_weave',
1916
allow_reserved=True)
1917
parent_map = self._find_recursive_lcas()
1919
all_texts = self._get_interesting_texts(parent_map)
1921
# Note: Unfortunately, the order given by topo_sort will effect the
1922
# ordering resolution in the output. Specifically, if you add A then B,
1923
# then in the output text A lines will show up before B lines. And, of
1924
# course, topo_sort doesn't guarantee any real ordering.
1925
# So we use merge_sort, and add a fake node on the tip.
1926
# This ensures that left-hand parents will always be inserted into the
1927
# weave before right-hand parents.
1928
tip_key = self._key_prefix + (_mod_revision.CURRENT_REVISION,)
1929
parent_map[tip_key] = (self.a_key, self.b_key)
1931
for seq_num, key, depth, eom in reversed(tsort.merge_sort(parent_map,
1935
# for key in tsort.topo_sort(parent_map):
1936
parent_keys = parent_map[key]
1937
revision_id = key[-1]
1938
parent_ids = [k[-1] for k in parent_keys]
1939
self._weave.add_lines(revision_id, parent_ids,
1940
all_texts[revision_id])
1942
def plan_merge(self):
1943
"""Generate a 'plan' for merging the two revisions.
1945
This involves comparing their texts and determining the cause of
1946
differences. If text A has a line and text B does not, then either the
1947
line was added to text A, or it was deleted from B. Once the causes
1948
are combined, they are written out in the format described in
1949
VersionedFile.plan_merge
1951
if self._head_key is not None: # There was a single head
1952
if self._head_key == self.a_key:
1955
if self._head_key != self.b_key:
1956
raise AssertionError('There was an invalid head: %s != %s'
1957
% (self.b_key, self._head_key))
1959
head_rev = self._head_key[-1]
1960
lines = self.get_lines([head_rev])[head_rev]
1961
return ((plan, line) for line in lines)
1962
return self._weave.plan_merge(self.a_rev, self.b_rev)
1965
class _PlanLCAMerge(_PlanMergeBase):
1967
This merge algorithm differs from _PlanMerge in that:
1968
1. comparisons are done against LCAs only
1969
2. cases where a contested line is new versus one LCA but old versus
1970
another are marked as conflicts, by emitting the line as conflicted-a
1973
This is faster, and hopefully produces more useful output.
1976
def __init__(self, a_rev, b_rev, vf, key_prefix, graph):
1977
_PlanMergeBase.__init__(self, a_rev, b_rev, vf, key_prefix)
1978
lcas = graph.find_lca(key_prefix + (a_rev,), key_prefix + (b_rev,))
1981
if lca == _mod_revision.NULL_REVISION:
1984
self.lcas.add(lca[-1])
1985
for lca in self.lcas:
1986
if _mod_revision.is_null(lca):
1989
lca_lines = self.get_lines([lca])[lca]
1990
matcher = patiencediff.PatienceSequenceMatcher(None, self.lines_a,
1992
blocks = list(matcher.get_matching_blocks())
1993
self._cached_matching_blocks[(a_rev, lca)] = blocks
1994
matcher = patiencediff.PatienceSequenceMatcher(None, self.lines_b,
1996
blocks = list(matcher.get_matching_blocks())
1997
self._cached_matching_blocks[(b_rev, lca)] = blocks
1999
def _determine_status(self, revision_id, unique_line_numbers):
2000
"""Determines the status unique lines versus all lcas.
2002
Basically, determines why the line is unique to this revision.
2004
A line may be determined new, killed, or both.
2006
If a line is determined new, that means it was not present in at least
2007
one LCA, and is not present in the other merge revision.
2009
If a line is determined killed, that means the line was present in
2012
If a line is killed and new, this indicates that the two merge
2013
revisions contain differing conflict resolutions.
2014
:param revision_id: The id of the revision in which the lines are
2016
:param unique_line_numbers: The line numbers of unique lines.
2017
:return a tuple of (new_this, killed_other):
2021
unique_line_numbers = set(unique_line_numbers)
2022
for lca in self.lcas:
2023
blocks = self._get_matching_blocks(revision_id, lca)
2024
unique_vs_lca, _ignored = self._unique_lines(blocks)
2025
new.update(unique_line_numbers.intersection(unique_vs_lca))
2026
killed.update(unique_line_numbers.difference(unique_vs_lca))
added
removed
bzrlib/merge.py
