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# Copyright (C) 2006, 2007 Canonical Ltd
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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"""MutableTree object.
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See MutableTree for more details.
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from bzrlib.decorators import needs_read_lock, needs_write_lock
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from bzrlib.osutils import splitpath
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from bzrlib.symbol_versioning import DEPRECATED_PARAMETER
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def needs_tree_write_lock(unbound):
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"""Decorate unbound to take out and release a tree_write lock."""
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def tree_write_locked(self, *args, **kwargs):
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self.lock_tree_write()
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return unbound(self, *args, **kwargs)
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tree_write_locked.__doc__ = unbound.__doc__
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tree_write_locked.__name__ = unbound.__name__
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return tree_write_locked
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class MutableTree(tree.Tree):
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"""A MutableTree is a specialisation of Tree which is able to be mutated.
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Generally speaking these mutations are only possible within a lock_write
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context, and will revert if the lock is broken abnormally - but this cannot
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be guaranteed - depending on the exact implementation of the mutable state.
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The most common form of Mutable Tree is WorkingTree, see bzrlib.workingtree.
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For tests we also have MemoryTree which is a MutableTree whose contents are
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For now, we are not treating MutableTree as an interface to provide
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conformance tests for - rather we are testing MemoryTree specifically, and
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interface testing implementations of WorkingTree.
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A mutable tree always has an associated Branch and BzrDir object - the
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branch and bzrdir attributes.
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@needs_tree_write_lock
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def add(self, files, ids=None, kinds=None):
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"""Add paths to the set of versioned paths.
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Note that the command line normally calls smart_add instead,
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which can automatically recurse.
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This adds the files to the inventory, so that they will be
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recorded by the next commit.
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:param files: List of paths to add, relative to the base of the tree.
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:param ids: If set, use these instead of automatically generated ids.
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Must be the same length as the list of files, but may
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contain None for ids that are to be autogenerated.
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:param kinds: Optional parameter to specify the kinds to be used for
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TODO: Perhaps callback with the ids and paths as they're added.
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if isinstance(files, basestring):
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assert(ids is None or isinstance(ids, basestring))
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assert(kinds is None or isinstance(kinds, basestring))
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files = [path.strip('/') for path in files]
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ids = [None] * len(files)
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assert(len(ids) == len(files))
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ids = [osutils.safe_file_id(file_id) for file_id in ids]
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kinds = [None] * len(files)
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assert(len(kinds) == len(files))
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# generic constraint checks:
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if self.is_control_filename(f):
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raise errors.ForbiddenControlFileError(filename=f)
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# fill out file kinds for all files [not needed when we stop
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# caring about the instantaneous file kind within a uncommmitted tree
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self._gather_kinds(files, kinds)
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self._add(files, ids, kinds)
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def add_reference(self, sub_tree):
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"""Add a TreeReference to the tree, pointing at sub_tree"""
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raise errors.UnsupportedOperation(self.add_reference, self)
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def _add_reference(self, sub_tree):
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"""Standard add_reference implementation, for use by subclasses"""
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sub_tree_path = self.relpath(sub_tree.basedir)
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except errors.PathNotChild:
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raise errors.BadReferenceTarget(self, sub_tree,
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'Target not inside tree.')
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sub_tree_id = sub_tree.get_root_id()
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if sub_tree_id == self.get_root_id():
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raise errors.BadReferenceTarget(self, sub_tree,
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'Trees have the same root id.')
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if sub_tree_id in self.inventory:
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raise errors.BadReferenceTarget(self, sub_tree,
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'Root id already present in tree')
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self._add([sub_tree_path], [sub_tree_id], ['tree-reference'])
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def _add(self, files, ids, kinds):
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"""Helper function for add - updates the inventory.
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:param files: sequence of pathnames, relative to the tree root
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:param ids: sequence of suggested ids for the files (may be None)
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:param kinds: sequence of inventory kinds of the files (i.e. may
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contain "tree-reference")
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raise NotImplementedError(self._add)
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@needs_tree_write_lock
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def apply_inventory_delta(self, changes):
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"""Apply changes to the inventory as an atomic operation.
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The argument is a set of changes to apply. It must describe a
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valid result, but the order is not important. Specifically,
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intermediate stages *may* be invalid, such as when two files
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The changes should be structured as a list of tuples, of the form
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(old_path, new_path, file_id, new_entry). For creation, old_path
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must be None. For deletion, new_path and new_entry must be None.
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file_id is always non-None. For renames and other mutations, all
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values must be non-None.
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If the new_entry is a directory, its children should be an empty
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dict. Children are handled by apply_inventory_delta itself.
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:param changes: The list of tuples"""
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for old_path, file_id in sorted(((op, f) for op, np, f, e in changes
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if op is not None), reverse=True):
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if file_id not in inv:
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children[file_id] = getattr(inv[file_id], 'children', {})
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inv.remove_recursive_id(file_id)
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for new_path, new_entry in sorted((np, e) for op, np, f, e in
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changes if np is not None):
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if getattr(new_entry, 'children', None) is not None:
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new_entry.children = children.get(new_entry.file_id, {})
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self._write_inventory(inv)
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def commit(self, message=None, revprops=None, *args,
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# avoid circular imports
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from bzrlib import commit
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if not 'branch-nick' in revprops:
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revprops['branch-nick'] = self.branch.nick
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# args for wt.commit start at message from the Commit.commit method,
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args = (message, ) + args
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committed_id = commit.Commit().commit(working_tree=self,
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revprops=revprops, *args, **kwargs)
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def _gather_kinds(self, files, kinds):
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"""Helper function for add - sets the entries of kinds."""
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raise NotImplementedError(self._gather_kinds)
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def last_revision(self):
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"""Return the revision id of the last commit performed in this tree.
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In early tree formats the result of last_revision is the same as the
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branch last_revision, but that is no longer the case for modern tree
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last_revision returns the left most parent id, or None if there are no
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last_revision was deprecated as of 0.11. Please use get_parent_ids
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raise NotImplementedError(self.last_revision)
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def lock_tree_write(self):
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"""Lock the working tree for write, and the branch for read.
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This is useful for operations which only need to mutate the working
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tree. Taking out branch write locks is a relatively expensive process
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and may fail if the branch is on read only media. So branch write locks
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should only be taken out when we are modifying branch data - such as in
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operations like commit, pull, uncommit and update.
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raise NotImplementedError(self.lock_tree_write)
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def lock_write(self):
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"""Lock the tree and its branch. This allows mutating calls to be made.
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Some mutating methods will take out implicit write locks, but in
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general you should always obtain a write lock before calling mutating
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raise NotImplementedError(self.lock_write)
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def mkdir(self, path, file_id=None):
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"""Create a directory in the tree. if file_id is None, one is assigned.
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:param path: A unicode file path.
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:param file_id: An optional file-id.
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:return: the file id of the new directory.
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raise NotImplementedError(self.mkdir)
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def set_parent_trees(self, parents_list, allow_leftmost_as_ghost=False):
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"""Set the parents of the working tree.
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:param parents_list: A list of (revision_id, tree) tuples.
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If tree is None, then that element is treated as an unreachable
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parent tree - i.e. a ghost.
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raise NotImplementedError(self.set_parent_trees)
added
removed
bzrlib/mutabletree.py
