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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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from __future__ import absolute_import
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from bzrlib.lazy_import import lazy_import
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lazy_import(globals(), """
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from bzrlib import (
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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.i18n import gettext
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revision as _mod_revision,
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from bzrlib.branch import Branch
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from bzrlib.conflicts import ConflictList, Conflict
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from bzrlib.errors import (BzrCommandError,
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WorkingTreeNotRevision,
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from bzrlib.merge3 import Merge3
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from bzrlib.osutils import rename, pathjoin
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from progress import DummyProgress, ProgressPhase
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from bzrlib.revision import (is_ancestor, NULL_REVISION, ensure_null)
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from bzrlib.textfile import check_text_lines
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from bzrlib.trace import mutter, warning, note
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from bzrlib.transform import (TreeTransform, resolve_conflicts, cook_conflicts,
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conflict_pass, FinalPaths, create_by_entry,
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unique_add, ROOT_PARENT)
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from bzrlib.versionedfile import PlanWeaveMerge
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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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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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from_tree.lock_tree_write()
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operation = cleanup.OperationWithCleanups(merge_inner)
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operation.add_cleanup(from_tree.unlock)
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operation.run_simple(from_tree.branch, to_tree, from_tree,
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ignore_zero=True, interesting_ids=interesting_ids, this_tree=from_tree)
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class MergeHooks(hooks.Hooks):
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hooks.Hooks.__init__(self, "bzrlib.merge", "Merger.hooks")
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self.add_hook('merge_file_content',
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"Called with a bzrlib.merge.Merger object to create a per file "
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"merge object when starting a merge. "
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"Should return either None or a subclass of "
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"``bzrlib.merge.AbstractPerFileMerger``. "
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"Such objects will then be called per file "
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"that needs to be merged (including when one "
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"side has deleted the file and the other has changed it). "
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"See the AbstractPerFileMerger API docs for details on how it is "
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self.add_hook('pre_merge',
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'Called before a merge. '
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'Receives a Merger object as the single argument.',
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self.add_hook('post_merge',
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'Called after a merge. '
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'Receives a Merger object as the single argument. '
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'The return value is ignored.',
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class AbstractPerFileMerger(object):
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"""PerFileMerger objects are used by plugins extending merge for bzrlib.
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See ``bzrlib.plugins.news_merge.news_merge`` for an example concrete class.
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:ivar merger: The Merge3Merger performing the merge.
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def __init__(self, merger):
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"""Create a PerFileMerger for use with merger."""
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def merge_contents(self, merge_params):
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"""Attempt to merge the contents of a single file.
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:param merge_params: A bzrlib.merge.MergeFileHookParams
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:return: A tuple of (status, chunks), where status is one of
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'not_applicable', 'success', 'conflicted', or 'delete'. If status
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is 'success' or 'conflicted', then chunks should be an iterable of
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strings for the new file contents.
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return ('not applicable', None)
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class PerFileMerger(AbstractPerFileMerger):
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"""Merge individual files when self.file_matches returns True.
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This class is intended to be subclassed. The file_matches and
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merge_matching methods should be overridden with concrete implementations.
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def file_matches(self, params):
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"""Return True if merge_matching should be called on this file.
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Only called with merges of plain files with no clear winner.
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Subclasses must override this.
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raise NotImplementedError(self.file_matches)
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def get_filename(self, params, tree):
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"""Lookup the filename (i.e. basename, not path), given a Tree (e.g.
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self.merger.this_tree) and a MergeFileHookParams.
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return osutils.basename(tree.id2path(params.file_id))
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def get_filepath(self, params, tree):
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"""Calculate the path to the file in a tree.
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:param params: A MergeFileHookParams describing the file to merge
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:param tree: a Tree, e.g. self.merger.this_tree.
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return tree.id2path(params.file_id)
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def merge_contents(self, params):
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"""Merge the contents of a single file."""
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# Check whether this custom merge logic should be used.
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# OTHER is a straight winner, rely on default merge.
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params.winner == 'other' or
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# THIS and OTHER aren't both files.
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not params.is_file_merge() or
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# The filename doesn't match
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not self.file_matches(params)):
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return 'not_applicable', None
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return self.merge_matching(params)
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def merge_matching(self, params):
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"""Merge the contents of a single file that has matched the criteria
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in PerFileMerger.merge_contents (is a conflict, is a file,
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self.file_matches is True).
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Subclasses must override this.
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raise NotImplementedError(self.merge_matching)
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class ConfigurableFileMerger(PerFileMerger):
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"""Merge individual files when configured via a .conf file.
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This is a base class for concrete custom file merging logic. Concrete
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classes should implement ``merge_text``.
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See ``bzrlib.plugins.news_merge.news_merge`` for an example concrete class.
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:ivar affected_files: The configured file paths to merge.
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:cvar name_prefix: The prefix to use when looking up configuration
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details. <name_prefix>_merge_files describes the files targeted by the
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:cvar default_files: The default file paths to merge when no configuration
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def __init__(self, merger):
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super(ConfigurableFileMerger, self).__init__(merger)
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self.affected_files = None
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self.default_files = self.__class__.default_files or []
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self.name_prefix = self.__class__.name_prefix
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if self.name_prefix is None:
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raise ValueError("name_prefix must be set.")
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def file_matches(self, params):
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"""Check whether the file should call the merge hook.
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<name_prefix>_merge_files configuration variable is a list of files
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that should use the hook.
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affected_files = self.affected_files
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if affected_files is None:
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config = self.merger.this_branch.get_config()
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# Until bzr provides a better policy for caching the config, we
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# just add the part we're interested in to the params to avoid
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# reading the config files repeatedly (bazaar.conf, location.conf,
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config_key = self.name_prefix + '_merge_files'
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affected_files = config.get_user_option_as_list(config_key)
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if affected_files is None:
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# If nothing was specified in the config, use the default.
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affected_files = self.default_files
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self.affected_files = affected_files
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filepath = self.get_filepath(params, self.merger.this_tree)
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if filepath in affected_files:
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def merge_matching(self, params):
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return self.merge_text(params)
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def merge_text(self, params):
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"""Merge the byte contents of a single file.
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This is called after checking that the merge should be performed in
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merge_contents, and it should behave as per
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``bzrlib.merge.AbstractPerFileMerger.merge_contents``.
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raise NotImplementedError(self.merge_text)
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class MergeFileHookParams(object):
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"""Object holding parameters passed to merge_file_content hooks.
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There are some fields hooks can access:
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:ivar file_id: the file ID of the file being merged
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:ivar trans_id: the transform ID for the merge of this file
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:ivar this_kind: kind of file_id in 'this' tree
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:ivar other_kind: kind of file_id in 'other' tree
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:ivar winner: one of 'this', 'other', 'conflict'
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def __init__(self, merger, file_id, trans_id, this_kind, other_kind,
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self._merger = merger
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self.file_id = file_id
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self.trans_id = trans_id
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self.this_kind = this_kind
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self.other_kind = other_kind
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def is_file_merge(self):
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"""True if this_kind and other_kind are both 'file'."""
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return self.this_kind == 'file' and self.other_kind == 'file'
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@decorators.cachedproperty
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def base_lines(self):
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"""The lines of the 'base' version of the file."""
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return self._merger.get_lines(self._merger.base_tree, self.file_id)
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@decorators.cachedproperty
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def this_lines(self):
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"""The lines of the 'this' version of the file."""
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return self._merger.get_lines(self._merger.this_tree, self.file_id)
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@decorators.cachedproperty
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def other_lines(self):
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"""The lines of the 'other' version of the file."""
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return self._merger.get_lines(self._merger.other_tree, self.file_id)
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class Merger(object):
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def __init__(self, this_branch, other_tree=None, base_tree=None,
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this_tree=None, pb=DummyProgress(), change_reporter=None,
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this_tree=None, pb=None, change_reporter=None,
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recurse='down', revision_graph=None):
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object.__init__(self)
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assert this_tree is not None, "this_tree is required"
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self.this_branch = this_branch
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self.this_basis = _mod_revision.ensure_null(
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this_branch.last_revision())
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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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if revno is None:
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tree = workingtree.WorkingTree.open_containing(location)[0]
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return tree.branch, tree
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branch = Branch.open_containing(location, possible_transports)[0]
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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 = ensure_null(revision_id)
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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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def ensure_revision_trees(self):
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if self.this_revision_tree is None:
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self.this_basis_tree = self.revision_tree(self.this_basis)
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if self.this_basis == self.this_rev_id:
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self.this_revision_tree = self.this_basis_tree
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if self.other_rev_id is None:
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other_basis_tree = self.revision_tree(self.other_basis)
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changes = other_basis_tree.changes_from(self.other_tree)
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if changes.has_changed():
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raise WorkingTreeNotRevision(self.this_tree)
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other_rev_id = self.other_basis
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self.other_tree = other_basis_tree
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def file_revisions(self, file_id):
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self.ensure_revision_trees()
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def get_id(tree, file_id):
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revision_id = tree.inventory[file_id].revision
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assert revision_id is not None
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if self.this_rev_id is None:
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if self.this_basis_tree.get_file_sha1(file_id) != \
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self.this_tree.get_file_sha1(file_id):
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raise WorkingTreeNotRevision(self.this_tree)
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trees = (self.this_basis_tree, self.other_tree)
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return [get_id(tree, file_id) for tree in trees]
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def check_basis(self, check_clean, require_commits=True):
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if self.this_basis is None and require_commits is True:
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raise BzrCommandError("This branch has no commits."
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" (perhaps you would prefer 'bzr pull')")
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if self.this_basis != self.this_rev_id:
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raise BzrCommandError("Working tree has uncommitted changes.")
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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.RevisionNotPresent:
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basis_tree = self.this_tree.basis_tree()
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changes = self.this_tree.changes_from(basis_tree)
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if not changes.has_changed():
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self.this_rev_id = self.this_basis
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def set_interesting_files(self, file_list):
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self.interesting_files = file_list
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def set_pending(self):
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if not self.base_is_ancestor or not self.base_is_other_ancestor or self.other_rev_id is None:
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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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self._add_parent()
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def _add_parent(self):
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new_parents = self.this_tree.get_parent_ids() + [self.other_rev_id]
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new_parent_trees = []
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operation = cleanup.OperationWithCleanups(
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self.this_tree.set_parent_trees)
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for revision_id in new_parents:
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tree = self.revision_tree(revision_id)
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except errors.RevisionNotPresent:
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except errors.NoSuchRevision:
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operation.add_cleanup(tree.unlock)
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new_parent_trees.append((revision_id, tree))
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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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operation.run_simple(new_parent_trees, allow_leftmost_as_ghost=True)
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def set_other(self, other_revision, possible_transports=None):
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"""Set the revision and tree to merge from.
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528
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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self.base_is_ancestor = is_ancestor(self.this_basis,
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self.base_is_other_ancestor = is_ancestor(self.other_basis,
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def _maybe_fetch(self, source, target, revision_id):
307
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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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def find_base(self):
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this_repo = self.this_branch.repository
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graph = this_repo.get_graph()
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revisions = [ensure_null(self.this_basis),
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ensure_null(self.other_basis)]
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if NULL_REVISION in revisions:
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self.base_rev_id = NULL_REVISION
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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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self.base_rev_id = graph.find_unique_lca(*revisions)
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if self.base_rev_id == NULL_REVISION:
320
raise UnrelatedBranches()
321
self.base_tree = self.revision_tree(self.base_rev_id)
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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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self._is_criss_cross = True
553
# find_unique_lca can only handle 2 nodes, so we have to
554
# start back at the beginning. It is a shame to traverse
555
# the graph again, but better than re-implementing
557
self.base_rev_id = self.revision_graph.find_unique_lca(
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revisions[0], revisions[1])
560
self.base_rev_id = self.revision_graph.find_unique_lca(
562
sorted_lca_keys = self.revision_graph.find_merge_order(
564
if self.base_rev_id == _mod_revision.NULL_REVISION:
565
self.base_rev_id = sorted_lca_keys[0]
567
if self.base_rev_id == _mod_revision.NULL_REVISION:
568
raise errors.UnrelatedBranches()
569
if self._is_criss_cross:
570
trace.warning('Warning: criss-cross merge encountered. See bzr'
571
' help criss-cross.')
572
trace.mutter('Criss-cross lcas: %r' % lcas)
573
if self.base_rev_id in lcas:
574
trace.mutter('Unable to find unique lca. '
575
'Fallback %r as best option.'
577
interesting_revision_ids = set(lcas)
578
interesting_revision_ids.add(self.base_rev_id)
579
interesting_trees = dict((t.get_revision_id(), t)
580
for t in self.this_branch.repository.revision_trees(
581
interesting_revision_ids))
582
self._cached_trees.update(interesting_trees)
583
if self.base_rev_id in lcas:
584
self.base_tree = interesting_trees[self.base_rev_id]
586
self.base_tree = interesting_trees.pop(self.base_rev_id)
587
self._lca_trees = [interesting_trees[key]
588
for key in sorted_lca_keys]
590
self.base_tree = self.revision_tree(self.base_rev_id)
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591
self.base_is_ancestor = True
323
592
self.base_is_other_ancestor = True
593
trace.mutter('Base revid: %r' % self.base_rev_id)
325
595
def set_base(self, base_revision):
326
596
"""Set the base revision to use for the merge.
328
598
:param base_revision: A 2-list containing a path and revision number.
330
mutter("doing merge() with no base_revision specified")
600
trace.mutter("doing merge() with no base_revision specified")
331
601
if base_revision == [None, None]:
340
610
self.base_rev_id = _mod_revision.ensure_null(
341
611
base_branch.get_rev_id(base_revision[1]))
342
612
self._maybe_fetch(base_branch, self.this_branch, self.base_rev_id)
343
self.base_is_ancestor = is_ancestor(self.this_basis,
346
self.base_is_other_ancestor = is_ancestor(self.other_basis,
351
kwargs = {'working_tree':self.this_tree, 'this_tree': self.this_tree,
614
def make_merger(self):
615
kwargs = {'working_tree': self.this_tree, 'this_tree': self.this_tree,
352
616
'other_tree': self.other_tree,
353
617
'interesting_ids': self.interesting_ids,
354
618
'interesting_files': self.interesting_files,
619
'this_branch': self.this_branch,
620
'other_branch': self.other_branch,
356
622
if self.merge_type.requires_base:
357
623
kwargs['base_tree'] = self.base_tree
358
624
if self.merge_type.supports_reprocess:
359
625
kwargs['reprocess'] = self.reprocess
360
626
elif self.reprocess:
361
raise BzrError("Conflict reduction is not supported for merge"
362
" type %s." % self.merge_type)
627
raise errors.BzrError(
628
"Conflict reduction is not supported for merge"
629
" type %s." % self.merge_type)
363
630
if self.merge_type.supports_show_base:
364
631
kwargs['show_base'] = self.show_base
365
632
elif self.show_base:
366
raise BzrError("Showing base is not supported for this"
633
raise errors.BzrError("Showing base is not supported for this"
367
634
" merge type. %s" % self.merge_type)
635
if (not getattr(self.merge_type, 'supports_reverse_cherrypick', True)
636
and not self.base_is_other_ancestor):
637
raise errors.CannotReverseCherrypick()
638
if self.merge_type.supports_cherrypick:
639
kwargs['cherrypick'] = (not self.base_is_ancestor or
640
not self.base_is_other_ancestor)
641
if self._is_criss_cross and getattr(self.merge_type,
642
'supports_lca_trees', False):
643
kwargs['lca_trees'] = self._lca_trees
644
return self.merge_type(pb=None,
645
change_reporter=self.change_reporter,
648
def _do_merge_to(self):
649
merge = self.make_merger()
650
if self.other_branch is not None:
651
self.other_branch.update_references(self.this_branch)
652
for hook in Merger.hooks['pre_merge']:
655
for hook in Merger.hooks['post_merge']:
657
if self.recurse == 'down':
658
for relpath, file_id in self.this_tree.iter_references():
659
sub_tree = self.this_tree.get_nested_tree(file_id, relpath)
660
other_revision = self.other_tree.get_reference_revision(
662
if other_revision == sub_tree.last_revision():
664
sub_merge = Merger(sub_tree.branch, this_tree=sub_tree)
665
sub_merge.merge_type = self.merge_type
666
other_branch = self.other_branch.reference_parent(file_id,
668
sub_merge.set_other_revision(other_revision, other_branch)
669
base_revision = self.base_tree.get_reference_revision(file_id)
670
sub_merge.base_tree = \
671
sub_tree.branch.repository.revision_tree(base_revision)
672
sub_merge.base_rev_id = base_revision
677
operation = cleanup.OperationWithCleanups(self._do_merge_to)
368
678
self.this_tree.lock_tree_write()
679
operation.add_cleanup(self.this_tree.unlock)
369
680
if self.base_tree is not None:
370
681
self.base_tree.lock_read()
682
operation.add_cleanup(self.base_tree.unlock)
371
683
if self.other_tree is not None:
372
684
self.other_tree.lock_read()
374
merge = self.merge_type(pb=self._pb,
375
change_reporter=self.change_reporter,
377
if self.recurse == 'down':
378
for path, file_id in self.this_tree.iter_references():
379
sub_tree = self.this_tree.get_nested_tree(file_id, path)
380
other_revision = self.other_tree.get_reference_revision(
382
if other_revision == sub_tree.last_revision():
384
sub_merge = Merger(sub_tree.branch, this_tree=sub_tree)
385
sub_merge.merge_type = self.merge_type
386
relpath = self.this_tree.relpath(path)
387
other_branch = self.other_branch.reference_parent(file_id, relpath)
388
sub_merge.set_other_revision(other_revision, other_branch)
389
base_revision = self.base_tree.get_reference_revision(file_id)
390
sub_merge.base_tree = \
391
sub_tree.branch.repository.revision_tree(base_revision)
395
if self.other_tree is not None:
396
self.other_tree.unlock()
397
if self.base_tree is not None:
398
self.base_tree.unlock()
399
self.this_tree.unlock()
685
operation.add_cleanup(self.other_tree.unlock)
686
merge = operation.run_simple()
400
687
if len(merge.cooked_conflicts) == 0:
401
if not self.ignore_zero:
402
note("All changes applied successfully.")
688
if not self.ignore_zero and not trace.is_quiet():
689
trace.note(gettext("All changes applied successfully."))
404
note("%d conflicts encountered." % len(merge.cooked_conflicts))
691
trace.note(gettext("%d conflicts encountered.")
692
% len(merge.cooked_conflicts))
406
694
return len(merge.cooked_conflicts)
697
class _InventoryNoneEntry(object):
698
"""This represents an inventory entry which *isn't there*.
700
It simplifies the merging logic if we always have an InventoryEntry, even
701
if it isn't actually present
708
symlink_target = None
711
_none_entry = _InventoryNoneEntry()
409
714
class Merge3Merger(object):
410
715
"""Three-way merger that uses the merge3 text merger"""
411
716
requires_base = True
412
717
supports_reprocess = True
413
718
supports_show_base = True
414
719
history_based = False
720
supports_cherrypick = True
721
supports_reverse_cherrypick = True
415
722
winner_idx = {"this": 2, "other": 1, "conflict": 1}
723
supports_lca_trees = True
417
def __init__(self, working_tree, this_tree, base_tree, other_tree,
725
def __init__(self, working_tree, this_tree, base_tree, other_tree,
418
726
interesting_ids=None, reprocess=False, show_base=False,
419
pb=DummyProgress(), pp=None, change_reporter=None,
420
interesting_files=None):
727
pb=None, pp=None, change_reporter=None,
728
interesting_files=None, do_merge=True,
729
cherrypick=False, lca_trees=None, this_branch=None,
421
731
"""Initialize the merger object and perform the merge.
423
733
:param working_tree: The working tree to apply the merge to
424
734
:param this_tree: The local tree in the merge operation
425
735
:param base_tree: The common tree in the merge operation
426
:param other_tree: The other other tree to merge changes from
736
:param other_tree: The other tree to merge changes from
737
:param this_branch: The branch associated with this_tree. Defaults to
738
this_tree.branch if not supplied.
739
:param other_branch: The branch associated with other_tree, if any.
427
740
:param interesting_ids: The file_ids of files that should be
428
741
participate in the merge. May not be combined with
429
742
interesting_files.
430
743
:param: reprocess If True, perform conflict-reduction processing.
431
744
:param show_base: If True, show the base revision in text conflicts.
432
745
(incompatible with reprocess)
433
:param pb: A Progress bar
434
747
:param pp: A ProgressPhase object
435
748
:param change_reporter: An object that should report changes made
436
749
:param interesting_files: The tree-relative paths of files that should
439
752
be combined with interesting_ids. If neither interesting_files nor
440
753
interesting_ids is specified, all files may participate in the
755
:param lca_trees: Can be set to a dictionary of {revision_id:rev_tree}
756
if the ancestry was found to include a criss-cross merge.
757
Otherwise should be None.
443
759
object.__init__(self)
444
if interesting_files is not None:
445
assert interesting_ids is None
760
if interesting_files is not None and interesting_ids is not None:
762
'specify either interesting_ids or interesting_files')
763
if this_branch is None:
764
this_branch = this_tree.branch
446
765
self.interesting_ids = interesting_ids
447
766
self.interesting_files = interesting_files
448
self.this_tree = working_tree
449
self.this_tree.lock_tree_write()
767
self.working_tree = working_tree
768
self.this_tree = this_tree
450
769
self.base_tree = base_tree
451
self.base_tree.lock_read()
452
770
self.other_tree = other_tree
453
self.other_tree.lock_read()
771
self.this_branch = this_branch
772
self.other_branch = other_branch
454
773
self._raw_conflicts = []
455
774
self.cooked_conflicts = []
456
775
self.reprocess = reprocess
457
776
self.show_base = show_base
777
self._lca_trees = lca_trees
778
# Uncommenting this will change the default algorithm to always use
779
# _entries_lca. This can be useful for running the test suite and
780
# making sure we haven't missed any corner cases.
781
# if lca_trees is None:
782
# self._lca_trees = [self.base_tree]
460
783
self.change_reporter = change_reporter
462
self.pp = ProgressPhase("Merge phase", 3, self.pb)
464
self.tt = TreeTransform(working_tree, self.pb)
784
self.cherrypick = cherrypick
788
warnings.warn("pp argument to Merge3Merger is deprecated")
790
warnings.warn("pb argument to Merge3Merger is deprecated")
793
operation = cleanup.OperationWithCleanups(self._do_merge)
794
self.working_tree.lock_tree_write()
795
operation.add_cleanup(self.working_tree.unlock)
796
self.this_tree.lock_read()
797
operation.add_cleanup(self.this_tree.unlock)
798
self.base_tree.lock_read()
799
operation.add_cleanup(self.base_tree.unlock)
800
self.other_tree.lock_read()
801
operation.add_cleanup(self.other_tree.unlock)
804
def _do_merge(self, operation):
805
self.tt = transform.TreeTransform(self.working_tree, None)
806
operation.add_cleanup(self.tt.finalize)
807
self._compute_transform()
808
results = self.tt.apply(no_conflicts=True)
809
self.write_modified(results)
811
self.working_tree.add_conflicts(self.cooked_conflicts)
812
except errors.UnsupportedOperation:
815
def make_preview_transform(self):
816
operation = cleanup.OperationWithCleanups(self._make_preview_transform)
817
self.base_tree.lock_read()
818
operation.add_cleanup(self.base_tree.unlock)
819
self.other_tree.lock_read()
820
operation.add_cleanup(self.other_tree.unlock)
821
return operation.run_simple()
823
def _make_preview_transform(self):
824
self.tt = transform.TransformPreview(self.working_tree)
825
self._compute_transform()
828
def _compute_transform(self):
829
if self._lca_trees is None:
467
830
entries = self._entries3()
468
child_pb = ui.ui_factory.nested_progress_bar()
470
for num, (file_id, changed, parents3, names3,
471
executable3) in enumerate(entries):
472
child_pb.update('Preparing file merge', num, len(entries))
473
self._merge_names(file_id, parents3, names3)
475
file_status = self.merge_contents(file_id)
477
file_status = 'unmodified'
478
self._merge_executable(file_id,
479
executable3, file_status)
484
child_pb = ui.ui_factory.nested_progress_bar()
486
fs_conflicts = resolve_conflicts(self.tt, child_pb,
487
lambda t, c: conflict_pass(t, c, self.other_tree))
490
if change_reporter is not None:
491
from bzrlib import delta
492
delta.report_changes(self.tt._iter_changes(), change_reporter)
493
self.cook_conflicts(fs_conflicts)
494
for conflict in self.cooked_conflicts:
497
results = self.tt.apply(no_conflicts=True)
498
self.write_modified(results)
500
working_tree.add_conflicts(self.cooked_conflicts)
501
except UnsupportedOperation:
505
self.other_tree.unlock()
506
self.base_tree.unlock()
507
self.this_tree.unlock()
831
resolver = self._three_way
833
entries = self._entries_lca()
834
resolver = self._lca_multi_way
835
# Prepare merge hooks
836
factories = Merger.hooks['merge_file_content']
837
# One hook for each registered one plus our default merger
838
hooks = [factory(self) for factory in factories] + [self]
839
self.active_hooks = [hook for hook in hooks if hook is not None]
840
child_pb = ui.ui_factory.nested_progress_bar()
842
for num, (file_id, changed, parents3, names3,
843
executable3) in enumerate(entries):
844
# Try merging each entry
845
child_pb.update(gettext('Preparing file merge'),
847
self._merge_names(file_id, parents3, names3, resolver=resolver)
849
file_status = self._do_merge_contents(file_id)
851
file_status = 'unmodified'
852
self._merge_executable(file_id,
853
executable3, file_status, resolver=resolver)
856
self.tt.fixup_new_roots()
857
self._finish_computing_transform()
859
def _finish_computing_transform(self):
860
"""Finalize the transform and report the changes.
862
This is the second half of _compute_transform.
864
child_pb = ui.ui_factory.nested_progress_bar()
866
fs_conflicts = transform.resolve_conflicts(self.tt, child_pb,
867
lambda t, c: transform.conflict_pass(t, c, self.other_tree))
870
if self.change_reporter is not None:
871
from bzrlib import delta
872
delta.report_changes(
873
self.tt.iter_changes(), self.change_reporter)
874
self.cook_conflicts(fs_conflicts)
875
for conflict in self.cooked_conflicts:
876
trace.warning(unicode(conflict))
510
878
def _entries3(self):
511
879
"""Gather data about files modified between three trees.
540
911
result.append((file_id, changed, parents3, names3, executable3))
914
def _entries_lca(self):
915
"""Gather data about files modified between multiple trees.
917
This compares OTHER versus all LCA trees, and for interesting entries,
918
it then compares with THIS and BASE.
920
For the multi-valued entries, the format will be (BASE, [lca1, lca2])
922
:return: [(file_id, changed, parents, names, executable)], where:
924
* file_id: Simple file_id of the entry
925
* changed: Boolean, True if the kind or contents changed else False
926
* parents: ((base, [parent_id, in, lcas]), parent_id_other,
928
* names: ((base, [name, in, lcas]), name_in_other, name_in_this)
929
* executable: ((base, [exec, in, lcas]), exec_in_other,
932
if self.interesting_files is not None:
933
lookup_trees = [self.this_tree, self.base_tree]
934
lookup_trees.extend(self._lca_trees)
935
# I think we should include the lca trees as well
936
interesting_ids = self.other_tree.paths2ids(self.interesting_files,
939
interesting_ids = self.interesting_ids
941
walker = _mod_tree.MultiWalker(self.other_tree, self._lca_trees)
943
base_inventory = self.base_tree.inventory
944
this_inventory = self.this_tree.inventory
945
for path, file_id, other_ie, lca_values in walker.iter_all():
946
# Is this modified at all from any of the other trees?
948
other_ie = _none_entry
949
if interesting_ids is not None and file_id not in interesting_ids:
952
# If other_revision is found in any of the lcas, that means this
953
# node is uninteresting. This is because when merging, if there are
954
# multiple heads(), we have to create a new node. So if we didn't,
955
# we know that the ancestry is linear, and that OTHER did not
957
# See doc/developers/lca_merge_resolution.txt for details
958
other_revision = other_ie.revision
959
if other_revision is not None:
960
# We can't use this shortcut when other_revision is None,
961
# because it may be None because things are WorkingTrees, and
962
# not because it is *actually* None.
963
is_unmodified = False
964
for lca_path, ie in lca_values:
965
if ie is not None and ie.revision == other_revision:
972
for lca_path, lca_ie in lca_values:
974
lca_entries.append(_none_entry)
976
lca_entries.append(lca_ie)
978
if base_inventory.has_id(file_id):
979
base_ie = base_inventory[file_id]
981
base_ie = _none_entry
983
if this_inventory.has_id(file_id):
984
this_ie = this_inventory[file_id]
986
this_ie = _none_entry
992
for lca_ie in lca_entries:
993
lca_kinds.append(lca_ie.kind)
994
lca_parent_ids.append(lca_ie.parent_id)
995
lca_names.append(lca_ie.name)
996
lca_executable.append(lca_ie.executable)
998
kind_winner = self._lca_multi_way(
999
(base_ie.kind, lca_kinds),
1000
other_ie.kind, this_ie.kind)
1001
parent_id_winner = self._lca_multi_way(
1002
(base_ie.parent_id, lca_parent_ids),
1003
other_ie.parent_id, this_ie.parent_id)
1004
name_winner = self._lca_multi_way(
1005
(base_ie.name, lca_names),
1006
other_ie.name, this_ie.name)
1008
content_changed = True
1009
if kind_winner == 'this':
1010
# No kind change in OTHER, see if there are *any* changes
1011
if other_ie.kind == 'directory':
1012
if parent_id_winner == 'this' and name_winner == 'this':
1013
# No change for this directory in OTHER, skip
1015
content_changed = False
1016
elif other_ie.kind is None or other_ie.kind == 'file':
1017
def get_sha1(ie, tree):
1018
if ie.kind != 'file':
1020
return tree.get_file_sha1(file_id)
1021
base_sha1 = get_sha1(base_ie, self.base_tree)
1022
lca_sha1s = [get_sha1(ie, tree) for ie, tree
1023
in zip(lca_entries, self._lca_trees)]
1024
this_sha1 = get_sha1(this_ie, self.this_tree)
1025
other_sha1 = get_sha1(other_ie, self.other_tree)
1026
sha1_winner = self._lca_multi_way(
1027
(base_sha1, lca_sha1s), other_sha1, this_sha1,
1028
allow_overriding_lca=False)
1029
exec_winner = self._lca_multi_way(
1030
(base_ie.executable, lca_executable),
1031
other_ie.executable, this_ie.executable)
1032
if (parent_id_winner == 'this' and name_winner == 'this'
1033
and sha1_winner == 'this' and exec_winner == 'this'):
1034
# No kind, parent, name, exec, or content change for
1035
# OTHER, so this node is not considered interesting
1037
if sha1_winner == 'this':
1038
content_changed = False
1039
elif other_ie.kind == 'symlink':
1040
def get_target(ie, tree):
1041
if ie.kind != 'symlink':
1043
return tree.get_symlink_target(file_id)
1044
base_target = get_target(base_ie, self.base_tree)
1045
lca_targets = [get_target(ie, tree) for ie, tree
1046
in zip(lca_entries, self._lca_trees)]
1047
this_target = get_target(this_ie, self.this_tree)
1048
other_target = get_target(other_ie, self.other_tree)
1049
target_winner = self._lca_multi_way(
1050
(base_target, lca_targets),
1051
other_target, this_target)
1052
if (parent_id_winner == 'this' and name_winner == 'this'
1053
and target_winner == 'this'):
1054
# No kind, parent, name, or symlink target change
1057
if target_winner == 'this':
1058
content_changed = False
1059
elif other_ie.kind == 'tree-reference':
1060
# The 'changed' information seems to be handled at a higher
1061
# level. At least, _entries3 returns False for content
1062
# changed, even when at a new revision_id.
1063
content_changed = False
1064
if (parent_id_winner == 'this' and name_winner == 'this'):
1065
# Nothing interesting
1068
raise AssertionError('unhandled kind: %s' % other_ie.kind)
1070
# If we have gotten this far, that means something has changed
1071
result.append((file_id, content_changed,
1072
((base_ie.parent_id, lca_parent_ids),
1073
other_ie.parent_id, this_ie.parent_id),
1074
((base_ie.name, lca_names),
1075
other_ie.name, this_ie.name),
1076
((base_ie.executable, lca_executable),
1077
other_ie.executable, this_ie.executable)
1081
@deprecated_method(deprecated_in((2, 4, 0)))
543
1082
def fix_root(self):
545
self.tt.final_kind(self.tt.root)
1083
if self.tt.final_kind(self.tt.root) is None:
547
1084
self.tt.cancel_deletion(self.tt.root)
548
1085
if self.tt.final_file_id(self.tt.root) is None:
549
self.tt.version_file(self.tt.tree_file_id(self.tt.root),
1086
self.tt.version_file(self.tt.tree_file_id(self.tt.root),
551
if self.other_tree.inventory.root is None:
1088
other_root_file_id = self.other_tree.get_root_id()
1089
if other_root_file_id is None:
553
other_root_file_id = self.other_tree.inventory.root.file_id
554
1091
other_root = self.tt.trans_id_file_id(other_root_file_id)
555
1092
if other_root == self.tt.root:
558
self.tt.final_kind(other_root)
1094
if self.this_tree.inventory.has_id(
1095
self.other_tree.inventory.root.file_id):
1096
# the other tree's root is a non-root in the current tree (as
1097
# when a previously unrelated branch is merged into another)
561
self.reparent_children(self.other_tree.inventory.root, self.tt.root)
562
self.tt.cancel_creation(other_root)
563
self.tt.cancel_versioning(other_root)
565
def reparent_children(self, ie, target):
566
for thing, child in ie.children.iteritems():
1099
if self.tt.final_kind(other_root) is not None:
1100
other_root_is_present = True
1102
# other_root doesn't have a physical representation. We still need
1103
# to move any references to the actual root of the tree.
1104
other_root_is_present = False
1105
# 'other_tree.inventory.root' is not present in this tree. We are
1106
# calling adjust_path for children which *want* to be present with a
1107
# correct place to go.
1108
for _, child in self.other_tree.inventory.root.children.iteritems():
567
1109
trans_id = self.tt.trans_id_file_id(child.file_id)
568
self.tt.adjust_path(self.tt.final_name(trans_id), target, trans_id)
1110
if not other_root_is_present:
1111
if self.tt.final_kind(trans_id) is not None:
1112
# The item exist in the final tree and has a defined place
1115
# Move the item into the root
1117
final_name = self.tt.final_name(trans_id)
1118
except errors.NoFinalPath:
1119
# This file is not present anymore, ignore it.
1121
self.tt.adjust_path(final_name, self.tt.root, trans_id)
1122
if other_root_is_present:
1123
self.tt.cancel_creation(other_root)
1124
self.tt.cancel_versioning(other_root)
570
1126
def write_modified(self, results):
571
1127
modified_hashes = {}
572
1128
for path in results.modified_paths:
573
file_id = self.this_tree.path2id(self.this_tree.relpath(path))
1129
file_id = self.working_tree.path2id(self.working_tree.relpath(path))
574
1130
if file_id is None:
576
hash = self.this_tree.get_file_sha1(file_id)
1132
hash = self.working_tree.get_file_sha1(file_id)
577
1133
if hash is None:
579
1135
modified_hashes[file_id] = hash
580
self.this_tree.set_merge_modified(modified_hashes)
1136
self.working_tree.set_merge_modified(modified_hashes)
583
1139
def parent(entry, file_id):
721
1340
return kind, contents
723
def contents_conflict():
724
trans_id = self.tt.trans_id_file_id(file_id)
725
name = self.tt.final_name(trans_id)
726
parent_id = self.tt.final_parent(trans_id)
727
if file_id in self.this_tree.inventory:
728
self.tt.unversion_file(trans_id)
729
if file_id in self.this_tree:
730
self.tt.delete_contents(trans_id)
731
file_group = self._dump_conflicts(name, parent_id, file_id,
733
self._raw_conflicts.append(('contents conflict', file_group))
735
1342
# See SPOT run. run, SPOT, run.
736
1343
# So we're not QUITE repeating ourselves; we do tricky things with
738
1345
base_pair = contents_pair(self.base_tree)
739
1346
other_pair = contents_pair(self.other_tree)
740
if base_pair == other_pair:
741
# OTHER introduced no changes
743
this_pair = contents_pair(self.this_tree)
744
if this_pair == other_pair:
745
# THIS and OTHER introduced the same changes
1348
this_pair = contents_pair(self.this_tree)
1349
lca_pairs = [contents_pair(tree) for tree in self._lca_trees]
1350
winner = self._lca_multi_way((base_pair, lca_pairs), other_pair,
1351
this_pair, allow_overriding_lca=False)
748
trans_id = self.tt.trans_id_file_id(file_id)
749
if this_pair == base_pair:
750
# only OTHER introduced changes
751
if file_id in self.this_tree:
752
# Remove any existing contents
753
self.tt.delete_contents(trans_id)
754
if file_id in self.other_tree:
755
# OTHER changed the file
756
create_by_entry(self.tt,
757
self.other_tree.inventory[file_id],
758
self.other_tree, trans_id)
759
if file_id not in self.this_tree.inventory:
760
self.tt.version_file(file_id, trans_id)
762
elif file_id in self.this_tree.inventory:
763
# OTHER deleted the file
1353
if base_pair == other_pair:
1356
# We delayed evaluating this_pair as long as we can to avoid
1357
# unnecessary sha1 calculation
1358
this_pair = contents_pair(self.this_tree)
1359
winner = self._three_way(base_pair, other_pair, this_pair)
1360
if winner == 'this':
1361
# No interesting changes introduced by OTHER
1363
# We have a hypothetical conflict, but if we have files, then we
1364
# can try to merge the content
1365
trans_id = self.tt.trans_id_file_id(file_id)
1366
params = MergeFileHookParams(self, file_id, trans_id, this_pair[0],
1367
other_pair[0], winner)
1368
hooks = self.active_hooks
1369
hook_status = 'not_applicable'
1371
hook_status, lines = hook.merge_contents(params)
1372
if hook_status != 'not_applicable':
1373
# Don't try any more hooks, this one applies.
1375
# If the merge ends up replacing the content of the file, we get rid of
1376
# it at the end of this method (this variable is used to track the
1377
# exceptions to this rule).
1380
if hook_status == 'not_applicable':
1381
# No merge hook was able to resolve the situation. Two cases exist:
1382
# a content conflict or a duplicate one.
1384
name = self.tt.final_name(trans_id)
1385
parent_id = self.tt.final_parent(trans_id)
1387
inhibit_content_conflict = False
1388
if params.this_kind is None: # file_id is not in THIS
1389
# Is the name used for a different file_id ?
1390
dupe_path = self.other_tree.id2path(file_id)
1391
this_id = self.this_tree.path2id(dupe_path)
1392
if this_id is not None:
1393
# Two entries for the same path
1395
# versioning the merged file will trigger a duplicate
1397
self.tt.version_file(file_id, trans_id)
1398
transform.create_from_tree(
1399
self.tt, trans_id, self.other_tree, file_id,
1400
filter_tree_path=self._get_filter_tree_path(file_id))
1401
inhibit_content_conflict = True
1402
elif params.other_kind is None: # file_id is not in OTHER
1403
# Is the name used for a different file_id ?
1404
dupe_path = self.this_tree.id2path(file_id)
1405
other_id = self.other_tree.path2id(dupe_path)
1406
if other_id is not None:
1407
# Two entries for the same path again, but here, the other
1408
# entry will also be merged. We simply inhibit the
1409
# 'content' conflict creation because we know OTHER will
1410
# create (or has already created depending on ordering) an
1411
# entry at the same path. This will trigger a 'duplicate'
1414
inhibit_content_conflict = True
1415
if not inhibit_content_conflict:
1416
if params.this_kind is not None:
764
1417
self.tt.unversion_file(trans_id)
766
#BOTH THIS and OTHER introduced changes; scalar conflict
767
elif this_pair[0] == "file" and other_pair[0] == "file":
768
# THIS and OTHER are both files, so text merge. Either
769
# BASE is a file, or both converted to files, so at least we
770
# have agreement that output should be a file.
772
self.text_merge(file_id, trans_id)
774
return contents_conflict()
775
if file_id not in self.this_tree.inventory:
776
self.tt.version_file(file_id, trans_id)
778
self.tt.tree_kind(trans_id)
779
self.tt.delete_contents(trans_id)
784
# Scalar conflict, can't text merge. Dump conflicts
785
return contents_conflict()
1418
# This is a contents conflict, because none of the available
1419
# functions could merge it.
1420
file_group = self._dump_conflicts(name, parent_id, file_id,
1422
self._raw_conflicts.append(('contents conflict', file_group))
1423
elif hook_status == 'success':
1424
self.tt.create_file(lines, trans_id)
1425
elif hook_status == 'conflicted':
1426
# XXX: perhaps the hook should be able to provide
1427
# the BASE/THIS/OTHER files?
1428
self.tt.create_file(lines, trans_id)
1429
self._raw_conflicts.append(('text conflict', trans_id))
1430
name = self.tt.final_name(trans_id)
1431
parent_id = self.tt.final_parent(trans_id)
1432
self._dump_conflicts(name, parent_id, file_id)
1433
elif hook_status == 'delete':
1434
self.tt.unversion_file(trans_id)
1436
elif hook_status == 'done':
1437
# The hook function did whatever it needs to do directly, no
1438
# further action needed here.
1441
raise AssertionError('unknown hook_status: %r' % (hook_status,))
1442
if not self.this_tree.has_id(file_id) and result == "modified":
1443
self.tt.version_file(file_id, trans_id)
1445
# The merge has been performed and produced a new content, so the
1446
# old contents should not be retained.
1447
self.tt.delete_contents(trans_id)
1450
def _default_other_winner_merge(self, merge_hook_params):
1451
"""Replace this contents with other."""
1452
file_id = merge_hook_params.file_id
1453
trans_id = merge_hook_params.trans_id
1454
if self.other_tree.has_id(file_id):
1455
# OTHER changed the file
1456
transform.create_from_tree(
1457
self.tt, trans_id, self.other_tree, file_id,
1458
filter_tree_path=self._get_filter_tree_path(file_id))
1460
elif self.this_tree.has_id(file_id):
1461
# OTHER deleted the file
1462
return 'delete', None
1464
raise AssertionError(
1465
'winner is OTHER, but file_id %r not in THIS or OTHER tree'
1468
def merge_contents(self, merge_hook_params):
1469
"""Fallback merge logic after user installed hooks."""
1470
# This function is used in merge hooks as the fallback instance.
1471
# Perhaps making this function and the functions it calls be a
1472
# a separate class would be better.
1473
if merge_hook_params.winner == 'other':
1474
# OTHER is a straight winner, so replace this contents with other
1475
return self._default_other_winner_merge(merge_hook_params)
1476
elif merge_hook_params.is_file_merge():
1477
# THIS and OTHER are both files, so text merge. Either
1478
# BASE is a file, or both converted to files, so at least we
1479
# have agreement that output should be a file.
1481
self.text_merge(merge_hook_params.file_id,
1482
merge_hook_params.trans_id)
1483
except errors.BinaryFile:
1484
return 'not_applicable', None
1487
return 'not_applicable', None
787
1489
def get_lines(self, tree, file_id):
788
1490
"""Return the lines in a file, or an empty list."""
790
return tree.get_file(file_id).readlines()
1491
if tree.has_id(file_id):
1492
return tree.get_file_lines(file_id)
842
1559
determined automatically. If set_version is true, the .OTHER, .THIS
843
1560
or .BASE (in that order) will be created as versioned files.
845
data = [('OTHER', self.other_tree, other_lines),
1562
data = [('OTHER', self.other_tree, other_lines),
846
1563
('THIS', self.this_tree, this_lines)]
848
1565
data.append(('BASE', self.base_tree, base_lines))
1567
# We need to use the actual path in the working tree of the file here,
1568
# ignoring the conflict suffixes
1570
if wt.supports_content_filtering():
1572
filter_tree_path = wt.id2path(file_id)
1573
except errors.NoSuchId:
1574
# file has been deleted
1575
filter_tree_path = None
1577
# Skip the id2path lookup for older formats
1578
filter_tree_path = None
849
1580
versioned = False
851
1582
for suffix, tree, lines in data:
1583
if tree.has_id(file_id):
853
1584
trans_id = self._conflict_file(name, parent_id, tree, file_id,
1585
suffix, lines, filter_tree_path)
855
1586
file_group.append(trans_id)
856
1587
if set_version and not versioned:
857
1588
self.tt.version_file(file_id, trans_id)
858
1589
versioned = True
859
1590
return file_group
861
def _conflict_file(self, name, parent_id, tree, file_id, suffix,
1592
def _conflict_file(self, name, parent_id, tree, file_id, suffix,
1593
lines=None, filter_tree_path=None):
863
1594
"""Emit a single conflict file."""
864
1595
name = name + '.' + suffix
865
1596
trans_id = self.tt.create_path(name, parent_id)
866
entry = tree.inventory[file_id]
867
create_by_entry(self.tt, entry, tree, trans_id, lines)
1597
transform.create_from_tree(self.tt, trans_id, tree, file_id, lines,
870
1601
def merge_executable(self, file_id, file_status):
871
1602
"""Perform a merge on the execute bit."""
872
1603
executable = [self.executable(t, file_id) for t in (self.base_tree,
873
1604
self.other_tree, self.this_tree)]
874
self._merge_executable(file_id, executable, file_status)
1605
self._merge_executable(file_id, executable, file_status,
1606
resolver=self._three_way)
876
def _merge_executable(self, file_id, executable, file_status):
1608
def _merge_executable(self, file_id, executable, file_status,
877
1610
"""Perform a merge on the execute bit."""
878
1611
base_executable, other_executable, this_executable = executable
879
1612
if file_status == "deleted":
881
trans_id = self.tt.trans_id_file_id(file_id)
883
if self.tt.final_kind(trans_id) != "file":
887
winner = self._three_way(*executable)
1614
winner = resolver(*executable)
888
1615
if winner == "conflict":
889
1616
# There must be a None in here, if we have a conflict, but we
890
1617
# need executability since file status was not deleted.
894
1621
winner = "other"
1622
if winner == 'this' and file_status != "modified":
1624
trans_id = self.tt.trans_id_file_id(file_id)
1625
if self.tt.final_kind(trans_id) != "file":
895
1627
if winner == "this":
896
if file_status == "modified":
897
executability = this_executable
898
if executability is not None:
899
trans_id = self.tt.trans_id_file_id(file_id)
900
self.tt.set_executability(executability, trans_id)
1628
executability = this_executable
902
assert winner == "other"
903
if file_id in self.other_tree:
1630
if self.other_tree.has_id(file_id):
904
1631
executability = other_executable
905
elif file_id in self.this_tree:
1632
elif self.this_tree.has_id(file_id):
906
1633
executability = this_executable
907
elif file_id in self.base_tree:
1634
elif self.base_tree_has_id(file_id):
908
1635
executability = base_executable
909
if executability is not None:
910
trans_id = self.tt.trans_id_file_id(file_id)
911
self.tt.set_executability(executability, trans_id)
1636
if executability is not None:
1637
trans_id = self.tt.trans_id_file_id(file_id)
1638
self.tt.set_executability(executability, trans_id)
913
1640
def cook_conflicts(self, fs_conflicts):
914
1641
"""Convert all conflicts into a form that doesn't depend on trans_id"""
915
from conflicts import Conflict
917
self.cooked_conflicts.extend(cook_conflicts(fs_conflicts, self.tt))
918
fp = FinalPaths(self.tt)
1642
content_conflict_file_ids = set()
1643
cooked_conflicts = transform.cook_conflicts(fs_conflicts, self.tt)
1644
fp = transform.FinalPaths(self.tt)
919
1645
for conflict in self._raw_conflicts:
920
1646
conflict_type = conflict[0]
921
if conflict_type in ('name conflict', 'parent conflict'):
922
trans_id = conflict[1]
923
conflict_args = conflict[2:]
924
if trans_id not in name_conflicts:
925
name_conflicts[trans_id] = {}
926
unique_add(name_conflicts[trans_id], conflict_type,
928
if conflict_type == 'contents conflict':
1647
if conflict_type == 'path conflict':
1649
this_parent, this_name,
1650
other_parent, other_name) = conflict[1:]
1651
if this_parent is None or this_name is None:
1652
this_path = '<deleted>'
1654
parent_path = fp.get_path(
1655
self.tt.trans_id_file_id(this_parent))
1656
this_path = osutils.pathjoin(parent_path, this_name)
1657
if other_parent is None or other_name is None:
1658
other_path = '<deleted>'
1660
if other_parent == self.other_tree.get_root_id():
1661
# The tree transform doesn't know about the other root,
1662
# so we special case here to avoid a NoFinalPath
1666
parent_path = fp.get_path(
1667
self.tt.trans_id_file_id(other_parent))
1668
other_path = osutils.pathjoin(parent_path, other_name)
1669
c = _mod_conflicts.Conflict.factory(
1670
'path conflict', path=this_path,
1671
conflict_path=other_path,
1673
elif conflict_type == 'contents conflict':
929
1674
for trans_id in conflict[1]:
930
1675
file_id = self.tt.final_file_id(trans_id)
931
1676
if file_id is not None:
1677
# Ok we found the relevant file-id
933
1679
path = fp.get_path(trans_id)
934
1680
for suffix in ('.BASE', '.THIS', '.OTHER'):
935
1681
if path.endswith(suffix):
1682
# Here is the raw path
936
1683
path = path[:-len(suffix)]
938
c = Conflict.factory(conflict_type, path=path, file_id=file_id)
939
self.cooked_conflicts.append(c)
940
if conflict_type == 'text conflict':
1685
c = _mod_conflicts.Conflict.factory(conflict_type,
1686
path=path, file_id=file_id)
1687
content_conflict_file_ids.add(file_id)
1688
elif conflict_type == 'text conflict':
941
1689
trans_id = conflict[1]
942
1690
path = fp.get_path(trans_id)
943
1691
file_id = self.tt.final_file_id(trans_id)
944
c = Conflict.factory(conflict_type, path=path, file_id=file_id)
945
self.cooked_conflicts.append(c)
1692
c = _mod_conflicts.Conflict.factory(conflict_type,
1693
path=path, file_id=file_id)
1695
raise AssertionError('bad conflict type: %r' % (conflict,))
1696
cooked_conflicts.append(c)
947
for trans_id, conflicts in name_conflicts.iteritems():
949
this_parent, other_parent = conflicts['parent conflict']
950
assert this_parent != other_parent
952
this_parent = other_parent = \
953
self.tt.final_file_id(self.tt.final_parent(trans_id))
955
this_name, other_name = conflicts['name conflict']
956
assert this_name != other_name
958
this_name = other_name = self.tt.final_name(trans_id)
959
other_path = fp.get_path(trans_id)
960
if this_parent is not None and this_name is not None:
962
fp.get_path(self.tt.trans_id_file_id(this_parent))
963
this_path = pathjoin(this_parent_path, this_name)
965
this_path = "<deleted>"
966
file_id = self.tt.final_file_id(trans_id)
967
c = Conflict.factory('path conflict', path=this_path,
968
conflict_path=other_path, file_id=file_id)
1698
self.cooked_conflicts = []
1699
# We want to get rid of path conflicts when a corresponding contents
1700
# conflict exists. This can occur when one branch deletes a file while
1701
# the other renames *and* modifies it. In this case, the content
1702
# conflict is enough.
1703
for c in cooked_conflicts:
1704
if (c.typestring == 'path conflict'
1705
and c.file_id in content_conflict_file_ids):
969
1707
self.cooked_conflicts.append(c)
970
self.cooked_conflicts.sort(key=Conflict.sort_key)
1708
self.cooked_conflicts.sort(key=_mod_conflicts.Conflict.sort_key)
973
1711
class WeaveMerger(Merge3Merger):
974
1712
"""Three-way tree merger, text weave merger."""
975
1713
supports_reprocess = True
976
1714
supports_show_base = False
1715
supports_reverse_cherrypick = False
1716
history_based = True
978
def __init__(self, working_tree, this_tree, base_tree, other_tree,
979
interesting_ids=None, pb=DummyProgress(), pp=None,
980
reprocess=False, change_reporter=None,
981
interesting_files=None):
982
super(WeaveMerger, self).__init__(working_tree, this_tree,
983
base_tree, other_tree,
984
interesting_ids=interesting_ids,
985
pb=pb, pp=pp, reprocess=reprocess,
986
change_reporter=change_reporter)
1718
def _generate_merge_plan(self, file_id, base):
1719
return self.this_tree.plan_file_merge(file_id, self.other_tree,
988
1722
def _merged_lines(self, file_id):
989
1723
"""Generate the merged lines.
990
1724
There is no distinction between lines that are meant to contain <<<<<<<
993
plan = self.this_tree.plan_file_merge(file_id, self.other_tree)
994
textmerge = PlanWeaveMerge(plan, '<<<<<<< TREE\n',
995
'>>>>>>> MERGE-SOURCE\n')
996
return textmerge.merge_lines(self.reprocess)
1728
base = self.base_tree
1731
plan = self._generate_merge_plan(file_id, base)
1732
if 'merge' in debug.debug_flags:
1734
trans_id = self.tt.trans_id_file_id(file_id)
1735
name = self.tt.final_name(trans_id) + '.plan'
1736
contents = ('%11s|%s' % l for l in plan)
1737
self.tt.new_file(name, self.tt.final_parent(trans_id), contents)
1738
textmerge = versionedfile.PlanWeaveMerge(plan, '<<<<<<< TREE\n',
1739
'>>>>>>> MERGE-SOURCE\n')
1740
lines, conflicts = textmerge.merge_lines(self.reprocess)
1742
base_lines = textmerge.base_from_plan()
1745
return lines, base_lines
998
1747
def text_merge(self, file_id, trans_id):
999
1748
"""Perform a (weave) text merge for a given file and file-id.
1000
1749
If conflicts are encountered, .THIS and .OTHER files will be emitted,
1001
1750
and a conflict will be noted.
1003
lines, conflicts = self._merged_lines(file_id)
1752
lines, base_lines = self._merged_lines(file_id)
1004
1753
lines = list(lines)
1005
# Note we're checking whether the OUTPUT is binary in this case,
1754
# Note we're checking whether the OUTPUT is binary in this case,
1006
1755
# because we don't want to get into weave merge guts.
1007
check_text_lines(lines)
1756
textfile.check_text_lines(lines)
1008
1757
self.tt.create_file(lines, trans_id)
1758
if base_lines is not None:
1010
1760
self._raw_conflicts.append(('text conflict', trans_id))
1011
1761
name = self.tt.final_name(trans_id)
1012
1762
parent_id = self.tt.final_parent(trans_id)
1013
file_group = self._dump_conflicts(name, parent_id, file_id,
1763
file_group = self._dump_conflicts(name, parent_id, file_id,
1765
base_lines=base_lines)
1015
1766
file_group.append(trans_id)
1769
class LCAMerger(WeaveMerger):
1771
def _generate_merge_plan(self, file_id, base):
1772
return self.this_tree.plan_file_lca_merge(file_id, self.other_tree,
1018
1775
class Diff3Merger(Merge3Merger):
1019
1776
"""Three-way merger using external diff3 for text merging"""
1021
1778
def dump_file(self, temp_dir, name, tree, file_id):
1022
out_path = pathjoin(temp_dir, name)
1779
out_path = osutils.pathjoin(temp_dir, name)
1023
1780
out_file = open(out_path, "wb")
1025
1782
in_file = tree.get_file(file_id)
1058
1815
osutils.rmtree(temp_dir)
1818
class PathNotInTree(errors.BzrError):
1820
_fmt = """Merge-into failed because %(tree)s does not contain %(path)s."""
1822
def __init__(self, path, tree):
1823
errors.BzrError.__init__(self, path=path, tree=tree)
1826
class MergeIntoMerger(Merger):
1827
"""Merger that understands other_tree will be merged into a subdir.
1829
This also changes the Merger api so that it uses real Branch, revision_id,
1830
and RevisonTree objects, rather than using revision specs.
1833
def __init__(self, this_tree, other_branch, other_tree, target_subdir,
1834
source_subpath, other_rev_id=None):
1835
"""Create a new MergeIntoMerger object.
1837
source_subpath in other_tree will be effectively copied to
1838
target_subdir in this_tree.
1840
:param this_tree: The tree that we will be merging into.
1841
:param other_branch: The Branch we will be merging from.
1842
:param other_tree: The RevisionTree object we want to merge.
1843
:param target_subdir: The relative path where we want to merge
1844
other_tree into this_tree
1845
:param source_subpath: The relative path specifying the subtree of
1846
other_tree to merge into this_tree.
1848
# It is assumed that we are merging a tree that is not in our current
1849
# ancestry, which means we are using the "EmptyTree" as our basis.
1850
null_ancestor_tree = this_tree.branch.repository.revision_tree(
1851
_mod_revision.NULL_REVISION)
1852
super(MergeIntoMerger, self).__init__(
1853
this_branch=this_tree.branch,
1854
this_tree=this_tree,
1855
other_tree=other_tree,
1856
base_tree=null_ancestor_tree,
1858
self._target_subdir = target_subdir
1859
self._source_subpath = source_subpath
1860
self.other_branch = other_branch
1861
if other_rev_id is None:
1862
other_rev_id = other_tree.get_revision_id()
1863
self.other_rev_id = self.other_basis = other_rev_id
1864
self.base_is_ancestor = True
1865
self.backup_files = True
1866
self.merge_type = Merge3Merger
1867
self.show_base = False
1868
self.reprocess = False
1869
self.interesting_ids = None
1870
self.merge_type = _MergeTypeParameterizer(MergeIntoMergeType,
1871
target_subdir=self._target_subdir,
1872
source_subpath=self._source_subpath)
1873
if self._source_subpath != '':
1874
# If this isn't a partial merge make sure the revisions will be
1876
self._maybe_fetch(self.other_branch, self.this_branch,
1879
def set_pending(self):
1880
if self._source_subpath != '':
1882
Merger.set_pending(self)
1885
class _MergeTypeParameterizer(object):
1886
"""Wrap a merge-type class to provide extra parameters.
1888
This is hack used by MergeIntoMerger to pass some extra parameters to its
1889
merge_type. Merger.do_merge() sets up its own set of parameters to pass to
1890
the 'merge_type' member. It is difficult override do_merge without
1891
re-writing the whole thing, so instead we create a wrapper which will pass
1892
the extra parameters.
1895
def __init__(self, merge_type, **kwargs):
1896
self._extra_kwargs = kwargs
1897
self._merge_type = merge_type
1899
def __call__(self, *args, **kwargs):
1900
kwargs.update(self._extra_kwargs)
1901
return self._merge_type(*args, **kwargs)
1903
def __getattr__(self, name):
1904
return getattr(self._merge_type, name)
1907
class MergeIntoMergeType(Merge3Merger):
1908
"""Merger that incorporates a tree (or part of a tree) into another."""
1910
def __init__(self, *args, **kwargs):
1911
"""Initialize the merger object.
1913
:param args: See Merge3Merger.__init__'s args.
1914
:param kwargs: See Merge3Merger.__init__'s keyword args, except for
1915
source_subpath and target_subdir.
1916
:keyword source_subpath: The relative path specifying the subtree of
1917
other_tree to merge into this_tree.
1918
:keyword target_subdir: The relative path where we want to merge
1919
other_tree into this_tree
1921
# All of the interesting work happens during Merge3Merger.__init__(),
1922
# so we have have to hack in to get our extra parameters set.
1923
self._source_subpath = kwargs.pop('source_subpath')
1924
self._target_subdir = kwargs.pop('target_subdir')
1925
super(MergeIntoMergeType, self).__init__(*args, **kwargs)
1927
def _compute_transform(self):
1928
child_pb = ui.ui_factory.nested_progress_bar()
1930
entries = self._entries_to_incorporate()
1931
entries = list(entries)
1932
for num, (entry, parent_id) in enumerate(entries):
1933
child_pb.update(gettext('Preparing file merge'), num, len(entries))
1934
parent_trans_id = self.tt.trans_id_file_id(parent_id)
1935
trans_id = transform.new_by_entry(self.tt, entry,
1936
parent_trans_id, self.other_tree)
1939
self._finish_computing_transform()
1941
def _entries_to_incorporate(self):
1942
"""Yields pairs of (inventory_entry, new_parent)."""
1943
other_inv = self.other_tree.inventory
1944
subdir_id = other_inv.path2id(self._source_subpath)
1945
if subdir_id is None:
1946
# XXX: The error would be clearer if it gave the URL of the source
1947
# branch, but we don't have a reference to that here.
1948
raise PathNotInTree(self._source_subpath, "Source tree")
1949
subdir = other_inv[subdir_id]
1950
parent_in_target = osutils.dirname(self._target_subdir)
1951
target_id = self.this_tree.inventory.path2id(parent_in_target)
1952
if target_id is None:
1953
raise PathNotInTree(self._target_subdir, "Target tree")
1954
name_in_target = osutils.basename(self._target_subdir)
1955
merge_into_root = subdir.copy()
1956
merge_into_root.name = name_in_target
1957
if self.this_tree.inventory.has_id(merge_into_root.file_id):
1958
# Give the root a new file-id.
1959
# This can happen fairly easily if the directory we are
1960
# incorporating is the root, and both trees have 'TREE_ROOT' as
1961
# their root_id. Users will expect this to Just Work, so we
1962
# change the file-id here.
1963
# Non-root file-ids could potentially conflict too. That's really
1964
# an edge case, so we don't do anything special for those. We let
1965
# them cause conflicts.
1966
merge_into_root.file_id = generate_ids.gen_file_id(name_in_target)
1967
yield (merge_into_root, target_id)
1968
if subdir.kind != 'directory':
1969
# No children, so we are done.
1971
for ignored_path, entry in other_inv.iter_entries_by_dir(subdir_id):
1972
parent_id = entry.parent_id
1973
if parent_id == subdir.file_id:
1974
# The root's parent ID has changed, so make sure children of
1975
# the root refer to the new ID.
1976
parent_id = merge_into_root.file_id
1977
yield (entry, parent_id)
1061
1980
def merge_inner(this_branch, other_tree, base_tree, ignore_zero=False,
1062
1981
backup_files=False,
1063
1982
merge_type=Merge3Merger,
1130
2067
yield status_a(revision, text)
1131
2068
for revision, text in annotated_b[b_cur:bi]:
1132
2069
yield status_b(revision, text)
1134
2070
# and now the matched section
1137
for text_a, text_b in zip(plain_a[ai:a_cur], plain_b[bi:b_cur]):
1138
assert text_a == text_b
2073
for text_a in plain_a[ai:a_cur]:
1139
2074
yield "unchanged", text_a
2077
class _PlanMergeBase(object):
2079
def __init__(self, a_rev, b_rev, vf, key_prefix):
2082
:param a_rev: Revision-id of one revision to merge
2083
:param b_rev: Revision-id of the other revision to merge
2084
:param vf: A VersionedFiles containing both revisions
2085
:param key_prefix: A prefix for accessing keys in vf, typically
2091
self._last_lines = None
2092
self._last_lines_revision_id = None
2093
self._cached_matching_blocks = {}
2094
self._key_prefix = key_prefix
2095
self._precache_tip_lines()
2097
def _precache_tip_lines(self):
2098
lines = self.get_lines([self.a_rev, self.b_rev])
2099
self.lines_a = lines[self.a_rev]
2100
self.lines_b = lines[self.b_rev]
2102
def get_lines(self, revisions):
2103
"""Get lines for revisions from the backing VersionedFiles.
2105
:raises RevisionNotPresent: on absent texts.
2107
keys = [(self._key_prefix + (rev,)) for rev in revisions]
2109
for record in self.vf.get_record_stream(keys, 'unordered', True):
2110
if record.storage_kind == 'absent':
2111
raise errors.RevisionNotPresent(record.key, self.vf)
2112
result[record.key[-1]] = osutils.chunks_to_lines(
2113
record.get_bytes_as('chunked'))
2116
def plan_merge(self):
2117
"""Generate a 'plan' for merging the two revisions.
2119
This involves comparing their texts and determining the cause of
2120
differences. If text A has a line and text B does not, then either the
2121
line was added to text A, or it was deleted from B. Once the causes
2122
are combined, they are written out in the format described in
2123
VersionedFile.plan_merge
2125
blocks = self._get_matching_blocks(self.a_rev, self.b_rev)
2126
unique_a, unique_b = self._unique_lines(blocks)
2127
new_a, killed_b = self._determine_status(self.a_rev, unique_a)
2128
new_b, killed_a = self._determine_status(self.b_rev, unique_b)
2129
return self._iter_plan(blocks, new_a, killed_b, new_b, killed_a)
2131
def _iter_plan(self, blocks, new_a, killed_b, new_b, killed_a):
2134
for i, j, n in blocks:
2135
for a_index in range(last_i, i):
2136
if a_index in new_a:
2137
if a_index in killed_b:
2138
yield 'conflicted-a', self.lines_a[a_index]
2140
yield 'new-a', self.lines_a[a_index]
2142
yield 'killed-b', self.lines_a[a_index]
2143
for b_index in range(last_j, j):
2144
if b_index in new_b:
2145
if b_index in killed_a:
2146
yield 'conflicted-b', self.lines_b[b_index]
2148
yield 'new-b', self.lines_b[b_index]
2150
yield 'killed-a', self.lines_b[b_index]
2151
# handle common lines
2152
for a_index in range(i, i+n):
2153
yield 'unchanged', self.lines_a[a_index]
2157
def _get_matching_blocks(self, left_revision, right_revision):
2158
"""Return a description of which sections of two revisions match.
2160
See SequenceMatcher.get_matching_blocks
2162
cached = self._cached_matching_blocks.get((left_revision,
2164
if cached is not None:
2166
if self._last_lines_revision_id == left_revision:
2167
left_lines = self._last_lines
2168
right_lines = self.get_lines([right_revision])[right_revision]
2170
lines = self.get_lines([left_revision, right_revision])
2171
left_lines = lines[left_revision]
2172
right_lines = lines[right_revision]
2173
self._last_lines = right_lines
2174
self._last_lines_revision_id = right_revision
2175
matcher = patiencediff.PatienceSequenceMatcher(None, left_lines,
2177
return matcher.get_matching_blocks()
2179
def _unique_lines(self, matching_blocks):
2180
"""Analyse matching_blocks to determine which lines are unique
2182
:return: a tuple of (unique_left, unique_right), where the values are
2183
sets of line numbers of unique lines.
2189
for i, j, n in matching_blocks:
2190
unique_left.extend(range(last_i, i))
2191
unique_right.extend(range(last_j, j))
2194
return unique_left, unique_right
2197
def _subtract_plans(old_plan, new_plan):
2198
"""Remove changes from new_plan that came from old_plan.
2200
It is assumed that the difference between the old_plan and new_plan
2201
is their choice of 'b' text.
2203
All lines from new_plan that differ from old_plan are emitted
2204
verbatim. All lines from new_plan that match old_plan but are
2205
not about the 'b' revision are emitted verbatim.
2207
Lines that match and are about the 'b' revision are the lines we
2208
don't want, so we convert 'killed-b' -> 'unchanged', and 'new-b'
2209
is skipped entirely.
2211
matcher = patiencediff.PatienceSequenceMatcher(None, old_plan,
2214
for i, j, n in matcher.get_matching_blocks():
2215
for jj in range(last_j, j):
2217
for jj in range(j, j+n):
2218
plan_line = new_plan[jj]
2219
if plan_line[0] == 'new-b':
2221
elif plan_line[0] == 'killed-b':
2222
yield 'unchanged', plan_line[1]
2228
class _PlanMerge(_PlanMergeBase):
2229
"""Plan an annotate merge using on-the-fly annotation"""
2231
def __init__(self, a_rev, b_rev, vf, key_prefix):
2232
super(_PlanMerge, self).__init__(a_rev, b_rev, vf, key_prefix)
2233
self.a_key = self._key_prefix + (self.a_rev,)
2234
self.b_key = self._key_prefix + (self.b_rev,)
2235
self.graph = _mod_graph.Graph(self.vf)
2236
heads = self.graph.heads((self.a_key, self.b_key))
2238
# one side dominates, so we can just return its values, yay for
2240
# Ideally we would know that before we get this far
2241
self._head_key = heads.pop()
2242
if self._head_key == self.a_key:
2246
trace.mutter('found dominating revision for %s\n%s > %s', self.vf,
2247
self._head_key[-1], other)
2250
self._head_key = None
2253
def _precache_tip_lines(self):
2254
# Turn this into a no-op, because we will do this later
2257
def _find_recursive_lcas(self):
2258
"""Find all the ancestors back to a unique lca"""
2259
cur_ancestors = (self.a_key, self.b_key)
2260
# graph.find_lca(uncommon, keys) now returns plain NULL_REVISION,
2261
# rather than a key tuple. We will just map that directly to no common
2265
next_lcas = self.graph.find_lca(*cur_ancestors)
2266
# Map a plain NULL_REVISION to a simple no-ancestors
2267
if next_lcas == set([_mod_revision.NULL_REVISION]):
2269
# Order the lca's based on when they were merged into the tip
2270
# While the actual merge portion of weave merge uses a set() of
2271
# active revisions, the order of insertion *does* effect the
2272
# implicit ordering of the texts.
2273
for rev_key in cur_ancestors:
2274
ordered_parents = tuple(self.graph.find_merge_order(rev_key,
2276
parent_map[rev_key] = ordered_parents
2277
if len(next_lcas) == 0:
2279
elif len(next_lcas) == 1:
2280
parent_map[list(next_lcas)[0]] = ()
2282
elif len(next_lcas) > 2:
2283
# More than 2 lca's, fall back to grabbing all nodes between
2284
# this and the unique lca.
2285
trace.mutter('More than 2 LCAs, falling back to all nodes for:'
2287
self.a_key, self.b_key, cur_ancestors)
2288
cur_lcas = next_lcas
2289
while len(cur_lcas) > 1:
2290
cur_lcas = self.graph.find_lca(*cur_lcas)
2291
if len(cur_lcas) == 0:
2292
# No common base to find, use the full ancestry
2295
unique_lca = list(cur_lcas)[0]
2296
if unique_lca == _mod_revision.NULL_REVISION:
2297
# find_lca will return a plain 'NULL_REVISION' rather
2298
# than a key tuple when there is no common ancestor, we
2299
# prefer to just use None, because it doesn't confuse
2300
# _get_interesting_texts()
2302
parent_map.update(self._find_unique_parents(next_lcas,
2305
cur_ancestors = next_lcas
2308
def _find_unique_parents(self, tip_keys, base_key):
2309
"""Find ancestors of tip that aren't ancestors of base.
2311
:param tip_keys: Nodes that are interesting
2312
:param base_key: Cull all ancestors of this node
2313
:return: The parent map for all revisions between tip_keys and
2314
base_key. base_key will be included. References to nodes outside of
2315
the ancestor set will also be removed.
2317
# TODO: this would be simpler if find_unique_ancestors took a list
2318
# instead of a single tip, internally it supports it, but it
2319
# isn't a "backwards compatible" api change.
2320
if base_key is None:
2321
parent_map = dict(self.graph.iter_ancestry(tip_keys))
2322
# We remove NULL_REVISION because it isn't a proper tuple key, and
2323
# thus confuses things like _get_interesting_texts, and our logic
2324
# to add the texts into the memory weave.
2325
if _mod_revision.NULL_REVISION in parent_map:
2326
parent_map.pop(_mod_revision.NULL_REVISION)
2329
for tip in tip_keys:
2331
self.graph.find_unique_ancestors(tip, [base_key]))
2332
parent_map = self.graph.get_parent_map(interesting)
2333
parent_map[base_key] = ()
2334
culled_parent_map, child_map, tails = self._remove_external_references(
2336
# Remove all the tails but base_key
2337
if base_key is not None:
2338
tails.remove(base_key)
2339
self._prune_tails(culled_parent_map, child_map, tails)
2340
# Now remove all the uninteresting 'linear' regions
2341
simple_map = _mod_graph.collapse_linear_regions(culled_parent_map)
2345
def _remove_external_references(parent_map):
2346
"""Remove references that go outside of the parent map.
2348
:param parent_map: Something returned from Graph.get_parent_map(keys)
2349
:return: (filtered_parent_map, child_map, tails)
2350
filtered_parent_map is parent_map without external references
2351
child_map is the {parent_key: [child_keys]} mapping
2352
tails is a list of nodes that do not have any parents in the map
2354
# TODO: The basic effect of this function seems more generic than
2355
# _PlanMerge. But the specific details of building a child_map,
2356
# and computing tails seems very specific to _PlanMerge.
2357
# Still, should this be in Graph land?
2358
filtered_parent_map = {}
2361
for key, parent_keys in parent_map.iteritems():
2362
culled_parent_keys = [p for p in parent_keys if p in parent_map]
2363
if not culled_parent_keys:
2365
for parent_key in culled_parent_keys:
2366
child_map.setdefault(parent_key, []).append(key)
2367
# TODO: Do we want to do this, it adds overhead for every node,
2368
# just to say that the node has no children
2369
child_map.setdefault(key, [])
2370
filtered_parent_map[key] = culled_parent_keys
2371
return filtered_parent_map, child_map, tails
2374
def _prune_tails(parent_map, child_map, tails_to_remove):
2375
"""Remove tails from the parent map.
2377
This will remove the supplied revisions until no more children have 0
2380
:param parent_map: A dict of {child: [parents]}, this dictionary will
2381
be modified in place.
2382
:param tails_to_remove: A list of tips that should be removed,
2383
this list will be consumed
2384
:param child_map: The reverse dict of parent_map ({parent: [children]})
2385
this dict will be modified
2386
:return: None, parent_map will be modified in place.
2388
while tails_to_remove:
2389
next = tails_to_remove.pop()
2390
parent_map.pop(next)
2391
children = child_map.pop(next)
2392
for child in children:
2393
child_parents = parent_map[child]
2394
child_parents.remove(next)
2395
if len(child_parents) == 0:
2396
tails_to_remove.append(child)
2398
def _get_interesting_texts(self, parent_map):
2399
"""Return a dict of texts we are interested in.
2401
Note that the input is in key tuples, but the output is in plain
2404
:param parent_map: The output from _find_recursive_lcas
2405
:return: A dict of {'revision_id':lines} as returned by
2406
_PlanMergeBase.get_lines()
2408
all_revision_keys = set(parent_map)
2409
all_revision_keys.add(self.a_key)
2410
all_revision_keys.add(self.b_key)
2412
# Everything else is in 'keys' but get_lines is in 'revision_ids'
2413
all_texts = self.get_lines([k[-1] for k in all_revision_keys])
2416
def _build_weave(self):
2417
from bzrlib import weave
2418
self._weave = weave.Weave(weave_name='in_memory_weave',
2419
allow_reserved=True)
2420
parent_map = self._find_recursive_lcas()
2422
all_texts = self._get_interesting_texts(parent_map)
2424
# Note: Unfortunately, the order given by topo_sort will effect the
2425
# ordering resolution in the output. Specifically, if you add A then B,
2426
# then in the output text A lines will show up before B lines. And, of
2427
# course, topo_sort doesn't guarantee any real ordering.
2428
# So we use merge_sort, and add a fake node on the tip.
2429
# This ensures that left-hand parents will always be inserted into the
2430
# weave before right-hand parents.
2431
tip_key = self._key_prefix + (_mod_revision.CURRENT_REVISION,)
2432
parent_map[tip_key] = (self.a_key, self.b_key)
2434
for seq_num, key, depth, eom in reversed(tsort.merge_sort(parent_map,
2438
# for key in tsort.topo_sort(parent_map):
2439
parent_keys = parent_map[key]
2440
revision_id = key[-1]
2441
parent_ids = [k[-1] for k in parent_keys]
2442
self._weave.add_lines(revision_id, parent_ids,
2443
all_texts[revision_id])
2445
def plan_merge(self):
2446
"""Generate a 'plan' for merging the two revisions.
2448
This involves comparing their texts and determining the cause of
2449
differences. If text A has a line and text B does not, then either the
2450
line was added to text A, or it was deleted from B. Once the causes
2451
are combined, they are written out in the format described in
2452
VersionedFile.plan_merge
2454
if self._head_key is not None: # There was a single head
2455
if self._head_key == self.a_key:
2458
if self._head_key != self.b_key:
2459
raise AssertionError('There was an invalid head: %s != %s'
2460
% (self.b_key, self._head_key))
2462
head_rev = self._head_key[-1]
2463
lines = self.get_lines([head_rev])[head_rev]
2464
return ((plan, line) for line in lines)
2465
return self._weave.plan_merge(self.a_rev, self.b_rev)
2468
class _PlanLCAMerge(_PlanMergeBase):
2470
This merge algorithm differs from _PlanMerge in that:
2472
1. comparisons are done against LCAs only
2473
2. cases where a contested line is new versus one LCA but old versus
2474
another are marked as conflicts, by emitting the line as conflicted-a
2477
This is faster, and hopefully produces more useful output.
2480
def __init__(self, a_rev, b_rev, vf, key_prefix, graph):
2481
_PlanMergeBase.__init__(self, a_rev, b_rev, vf, key_prefix)
2482
lcas = graph.find_lca(key_prefix + (a_rev,), key_prefix + (b_rev,))
2485
if lca == _mod_revision.NULL_REVISION:
2488
self.lcas.add(lca[-1])
2489
for lca in self.lcas:
2490
if _mod_revision.is_null(lca):
2493
lca_lines = self.get_lines([lca])[lca]
2494
matcher = patiencediff.PatienceSequenceMatcher(None, self.lines_a,
2496
blocks = list(matcher.get_matching_blocks())
2497
self._cached_matching_blocks[(a_rev, lca)] = blocks
2498
matcher = patiencediff.PatienceSequenceMatcher(None, self.lines_b,
2500
blocks = list(matcher.get_matching_blocks())
2501
self._cached_matching_blocks[(b_rev, lca)] = blocks
2503
def _determine_status(self, revision_id, unique_line_numbers):
2504
"""Determines the status unique lines versus all lcas.
2506
Basically, determines why the line is unique to this revision.
2508
A line may be determined new, killed, or both.
2510
If a line is determined new, that means it was not present in at least
2511
one LCA, and is not present in the other merge revision.
2513
If a line is determined killed, that means the line was present in
2516
If a line is killed and new, this indicates that the two merge
2517
revisions contain differing conflict resolutions.
2519
:param revision_id: The id of the revision in which the lines are
2521
:param unique_line_numbers: The line numbers of unique lines.
2522
:return: a tuple of (new_this, killed_other)
2526
unique_line_numbers = set(unique_line_numbers)
2527
for lca in self.lcas:
2528
blocks = self._get_matching_blocks(revision_id, lca)
2529
unique_vs_lca, _ignored = self._unique_lines(blocks)
2530
new.update(unique_line_numbers.intersection(unique_vs_lca))
2531
killed.update(unique_line_numbers.difference(unique_vs_lca))
added
removed
bzrlib/merge.py
