~bzr-pqm/bzr/bzr.dev : contents of bzrlib/memorytree.py at revision 6621

~bzr-pqm/bzr/bzr.dev : (revision 6621)

# Copyright (C) 2006 Canonical Ltd
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

"""MemoryTree object.

See MemoryTree for more details.
"""

from __future__ import absolute_import

import os

from bzrlib import (
    errors,
    mutabletree,
    revision as _mod_revision,
    )
from bzrlib.decorators import needs_read_lock
from bzrlib.inventory import Inventory
from bzrlib.osutils import sha_file
from bzrlib.mutabletree import needs_tree_write_lock
from bzrlib.transport.memory import MemoryTransport


class MemoryTree(mutabletree.MutableInventoryTree):
    """A MemoryTree is a specialisation of MutableTree.

    It maintains nearly no state outside of read_lock and write_lock
    transactions. (it keeps a reference to the branch, and its last-revision
    only).
    """

    def __init__(self, branch, revision_id):
        """Construct a MemoryTree for branch using revision_id."""
        self.branch = branch
        self.bzrdir = branch.bzrdir
        self._branch_revision_id = revision_id
        self._locks = 0
        self._lock_mode = None

    def get_config_stack(self):
        return self.branch.get_config_stack()

    def is_control_filename(self, filename):
        # Memory tree doesn't have any control filenames
        return False

    @needs_tree_write_lock
    def _add(self, files, ids, kinds):
        """See MutableTree._add."""
        for f, file_id, kind in zip(files, ids, kinds):
            if kind is None:
                kind = 'file'
            if file_id is None:
                self._inventory.add_path(f, kind=kind)
            else:
                self._inventory.add_path(f, kind=kind, file_id=file_id)

    def basis_tree(self):
        """See Tree.basis_tree()."""
        return self._basis_tree

    @staticmethod
    def create_on_branch(branch):
        """Create a MemoryTree for branch, using the last-revision of branch."""
        revision_id = _mod_revision.ensure_null(branch.last_revision())
        return MemoryTree(branch, revision_id)

    def _gather_kinds(self, files, kinds):
        """See MutableTree._gather_kinds.

        This implementation does not care about the file kind of
        missing files, so is a no-op.
        """

    def get_file(self, file_id, path=None):
        """See Tree.get_file."""
        if path is None:
            path = self.id2path(file_id)
        return self._file_transport.get(path)

    def get_file_sha1(self, file_id, path=None, stat_value=None):
        """See Tree.get_file_sha1()."""
        if path is None:
            path = self.id2path(file_id)
        stream = self._file_transport.get(path)
        return sha_file(stream)

    def get_root_id(self):
        return self.path2id('')

    def _comparison_data(self, entry, path):
        """See Tree._comparison_data."""
        if entry is None:
            return None, False, None
        return entry.kind, entry.executable, None

    @needs_tree_write_lock
    def rename_one(self, from_rel, to_rel):
        file_id = self.path2id(from_rel)
        to_dir, to_tail = os.path.split(to_rel)
        to_parent_id = self.path2id(to_dir)
        self._file_transport.move(from_rel, to_rel)
        self._inventory.rename(file_id, to_parent_id, to_tail)

    def path_content_summary(self, path):
        """See Tree.path_content_summary."""
        id = self.path2id(path)
        if id is None:
            return 'missing', None, None, None
        kind = self.kind(id)
        if kind == 'file':
            bytes = self._file_transport.get_bytes(path)
            size = len(bytes)
            executable = self._inventory[id].executable
            sha1 = None # no stat cache
            return (kind, size, executable, sha1)
        elif kind == 'directory':
            # memory tree does not support nested trees yet.
            return kind, None, None, None
        elif kind == 'symlink':
            raise NotImplementedError('symlink support')
        else:
            raise NotImplementedError('unknown kind')

    def _file_size(self, entry, stat_value):
        """See Tree._file_size."""
        if entry is None:
            return 0
        return entry.text_size

    @needs_read_lock
    def get_parent_ids(self):
        """See Tree.get_parent_ids.

        This implementation returns the current cached value from
            self._parent_ids.
        """
        return list(self._parent_ids)

    def has_filename(self, filename):
        """See Tree.has_filename()."""
        return self._file_transport.has(filename)

    def is_executable(self, file_id, path=None):
        return self._inventory[file_id].executable

    def kind(self, file_id):
        return self._inventory[file_id].kind

    def mkdir(self, path, file_id=None):
        """See MutableTree.mkdir()."""
        self.add(path, file_id, 'directory')
        if file_id is None:
            file_id = self.path2id(path)
        self._file_transport.mkdir(path)
        return file_id

    @needs_read_lock
    def last_revision(self):
        """See MutableTree.last_revision."""
        return self._branch_revision_id

    def lock_read(self):
        """Lock the memory tree for reading.

        This triggers population of data from the branch for its revision.
        """
        self._locks += 1
        try:
            if self._locks == 1:
                self.branch.lock_read()
                self._lock_mode = "r"
                self._populate_from_branch()
        except:
            self._locks -= 1
            raise

    def lock_tree_write(self):
        """See MutableTree.lock_tree_write()."""
        self._locks += 1
        try:
            if self._locks == 1:
                self.branch.lock_read()
                self._lock_mode = "w"
                self._populate_from_branch()
            elif self._lock_mode == "r":
                raise errors.ReadOnlyError(self)
        except:
            self._locks -= 1
            raise

    def lock_write(self):
        """See MutableTree.lock_write()."""
        self._locks += 1
        try:
            if self._locks == 1:
                self.branch.lock_write()
                self._lock_mode = "w"
                self._populate_from_branch()
            elif self._lock_mode == "r":
                raise errors.ReadOnlyError(self)
        except:
            self._locks -= 1
            raise

    def _populate_from_branch(self):
        """Populate the in-tree state from the branch."""
        self._set_basis()
        if self._branch_revision_id == _mod_revision.NULL_REVISION:
            self._parent_ids = []
        else:
            self._parent_ids = [self._branch_revision_id]
        self._inventory = Inventory(None, self._basis_tree.get_revision_id())
        self._file_transport = MemoryTransport()
        # TODO copy the revision trees content, or do it lazy, or something.
        inventory_entries = self._basis_tree.iter_entries_by_dir()
        for path, entry in inventory_entries:
            self._inventory.add(entry.copy())
            if path == '':
                continue
            if entry.kind == 'directory':
                self._file_transport.mkdir(path)
            elif entry.kind == 'file':
                self._file_transport.put_file(path,
                    self._basis_tree.get_file(entry.file_id))
            else:
                raise NotImplementedError(self._populate_from_branch)

    def put_file_bytes_non_atomic(self, file_id, bytes):
        """See MutableTree.put_file_bytes_non_atomic."""
        self._file_transport.put_bytes(self.id2path(file_id), bytes)

    def unlock(self):
        """Release a lock.

        This frees all cached state when the last lock context for the tree is
        left.
        """
        if self._locks == 1:
            self._basis_tree = None
            self._parent_ids = []
            self._inventory = None
            try:
                self.branch.unlock()
            finally:
                self._locks = 0
                self._lock_mode = None
        else:
            self._locks -= 1

    @needs_tree_write_lock
    def unversion(self, file_ids):
        """Remove the file ids in file_ids from the current versioned set.

        When a file_id is unversioned, all of its children are automatically
        unversioned.

        :param file_ids: The file ids to stop versioning.
        :raises: NoSuchId if any fileid is not currently versioned.
        """
        # XXX: This should be in mutabletree, but the inventory-save action
        # is not relevant to memory tree. Until that is done in unlock by
        # working tree, we cannot share the implementation.
        for file_id in file_ids:
            if self._inventory.has_id(file_id):
                self._inventory.remove_recursive_id(file_id)
            else:
                raise errors.NoSuchId(self, file_id)

    def set_parent_ids(self, revision_ids, allow_leftmost_as_ghost=False):
        """See MutableTree.set_parent_trees()."""
        for revision_id in revision_ids:
            _mod_revision.check_not_reserved_id(revision_id)
        if len(revision_ids) == 0:
            self._parent_ids = []
            self._branch_revision_id = _mod_revision.NULL_REVISION
        else:
            self._parent_ids = revision_ids
            self._branch_revision_id = revision_ids[0]
        self._allow_leftmost_as_ghost = allow_leftmost_as_ghost
        self._set_basis()
    
    def _set_basis(self):
        try:
            self._basis_tree = self.branch.repository.revision_tree(
                self._branch_revision_id)
        except errors.NoSuchRevision:
            if self._allow_leftmost_as_ghost:
                self._basis_tree = self.branch.repository.revision_tree(
                    _mod_revision.NULL_REVISION)
            else:
                raise

    def set_parent_trees(self, parents_list, allow_leftmost_as_ghost=False):
        """See MutableTree.set_parent_trees()."""
        if len(parents_list) == 0:
            self._parent_ids = []
            self._basis_tree = self.branch.repository.revision_tree(
                                   _mod_revision.NULL_REVISION)
        else:
            if parents_list[0][1] is None and not allow_leftmost_as_ghost:
                # a ghost in the left most parent
                raise errors.GhostRevisionUnusableHere(parents_list[0][0])
            self._parent_ids = [parent_id for parent_id, tree in parents_list]
            if parents_list[0][1] is None or parents_list[0][1] == 'null:':
                self._basis_tree = self.branch.repository.revision_tree(
                                       _mod_revision.NULL_REVISION)
            else:
                self._basis_tree = parents_list[0][1]
            self._branch_revision_id = parents_list[0][0]

1986.1.2 by Robert Collins Various changes to allow non-workingtree specific tests to run entirely	1	# Copyright (C) 2006 Canonical Ltd
	2	#
	3	# This program is free software; you can redistribute it and/or modify
	4	# it under the terms of the GNU General Public License as published by
	5	# the Free Software Foundation; either version 2 of the License, or
	6	# (at your option) any later version.
	7	#
	8	# This program is distributed in the hope that it will be useful,
	9	# but WITHOUT ANY WARRANTY; without even the implied warranty of
	10	# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	11	# GNU General Public License for more details.
	12	#
	13	# You should have received a copy of the GNU General Public License
	14	# along with this program; if not, write to the Free Software
4183.7.1 by Sabin Iacob update FSF mailing address	15	# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
1986.1.2 by Robert Collins Various changes to allow non-workingtree specific tests to run entirely	16
	17	"""MemoryTree object.
	18
	19	See MemoryTree for more details.
	20	"""
	21
6379.6.7 by Jelmer Vernooij Move importing from future until after doc string, otherwise the doc string will disappear.	22	from __future__ import absolute_import
1986.1.2 by Robert Collins Various changes to allow non-workingtree specific tests to run entirely	23
3567.5.1 by John Arbash Meinel Implement rename_one on MemoryTree, and expose that in the Branch Builder	24	import os
1986.1.2 by Robert Collins Various changes to allow non-workingtree specific tests to run entirely	25
2598.5.1 by Aaron Bentley Start eliminating the use of None to indicate null revision	26	from bzrlib import (
	27	errors,
	28	mutabletree,
	29	revision as _mod_revision,
	30	)
5121.2.4 by Jelmer Vernooij Remove more unused imports.	31	from bzrlib.decorators import needs_read_lock
5802.1.1 by Jelmer Vernooij Move Inventory._get_mutable_inventory -> mutable_inventory_from_tree.	32	from bzrlib.inventory import Inventory
1986.1.2 by Robert Collins Various changes to allow non-workingtree specific tests to run entirely	33	from bzrlib.osutils import sha_file
1986.1.8 by Robert Collins Update to bzr.dev, which involves adding lock_tree_write to MutableTree and MemoryTree.	34	from bzrlib.mutabletree import needs_tree_write_lock
1986.1.2 by Robert Collins Various changes to allow non-workingtree specific tests to run entirely	35	from bzrlib.transport.memory import MemoryTransport
	36
	37
5777.4.1 by Jelmer Vernooij Split inventory-specific code out of MutableTree into MutableInventoryTree.	38	class MemoryTree(mutabletree.MutableInventoryTree):
1986.1.2 by Robert Collins Various changes to allow non-workingtree specific tests to run entirely	39	"""A MemoryTree is a specialisation of MutableTree.
3943.8.1 by Marius Kruger remove all trailing whitespace from bzr source	40
1986.1.2 by Robert Collins Various changes to allow non-workingtree specific tests to run entirely	41	It maintains nearly no state outside of read_lock and write_lock
	42	transactions. (it keeps a reference to the branch, and its last-revision
	43	only).
	44	"""
	45
	46	def __init__(self, branch, revision_id):
	47	"""Construct a MemoryTree for branch using revision_id."""
	48	self.branch = branch
	49	self.bzrdir = branch.bzrdir
	50	self._branch_revision_id = revision_id
	51	self._locks = 0
	52	self._lock_mode = None
	53
6449.6.7 by Jelmer Vernooij Fix tests.	54	def get_config_stack(self):
	55	return self.branch.get_config_stack()
	56
5699.2.1 by Jelmer Vernooij Move is_control_filename() from Tree to MutableTree.	57	def is_control_filename(self, filename):
	58	# Memory tree doesn't have any control filenames
	59	return False
	60
1986.1.8 by Robert Collins Update to bzr.dev, which involves adding lock_tree_write to MutableTree and MemoryTree.	61	@needs_tree_write_lock
1986.1.2 by Robert Collins Various changes to allow non-workingtree specific tests to run entirely	62	def _add(self, files, ids, kinds):
	63	"""See MutableTree._add."""
	64	for f, file_id, kind in zip(files, ids, kinds):
	65	if kind is None:
	66	kind = 'file'
	67	if file_id is None:
	68	self._inventory.add_path(f, kind=kind)
	69	else:
	70	self._inventory.add_path(f, kind=kind, file_id=file_id)
	71
	72	def basis_tree(self):
	73	"""See Tree.basis_tree()."""
	74	return self._basis_tree
	75
	76	@staticmethod
	77	def create_on_branch(branch):
	78	"""Create a MemoryTree for branch, using the last-revision of branch."""
2598.5.4 by Aaron Bentley Restore original Branch.last_revision behavior, fix bits that care	79	revision_id = _mod_revision.ensure_null(branch.last_revision())
2598.5.1 by Aaron Bentley Start eliminating the use of None to indicate null revision	80	return MemoryTree(branch, revision_id)
1986.1.2 by Robert Collins Various changes to allow non-workingtree specific tests to run entirely	81
	82	def _gather_kinds(self, files, kinds):
	83	"""See MutableTree._gather_kinds.
3943.8.1 by Marius Kruger remove all trailing whitespace from bzr source	84
1986.1.2 by Robert Collins Various changes to allow non-workingtree specific tests to run entirely	85	This implementation does not care about the file kind of
	86	missing files, so is a no-op.
	87	"""
	88
2743.3.3 by Ian Clatworthy Skip path lookup for tree.get_file() when we already know the path	89	def get_file(self, file_id, path=None):
1986.1.2 by Robert Collins Various changes to allow non-workingtree specific tests to run entirely	90	"""See Tree.get_file."""
2743.3.3 by Ian Clatworthy Skip path lookup for tree.get_file() when we already know the path	91	if path is None:
	92	path = self.id2path(file_id)
	93	return self._file_transport.get(path)
1986.1.2 by Robert Collins Various changes to allow non-workingtree specific tests to run entirely	94
2564.2.1 by Ian Clatworthy refactor commit to support alternative population meothds	95	def get_file_sha1(self, file_id, path=None, stat_value=None):
1986.1.2 by Robert Collins Various changes to allow non-workingtree specific tests to run entirely	96	"""See Tree.get_file_sha1()."""
	97	if path is None:
	98	path = self.id2path(file_id)
	99	stream = self._file_transport.get(path)
	100	return sha_file(stream)
	101
2946.3.5 by John Arbash Meinel MemoryTree is not tested under the tree_implementations tests.	102	def get_root_id(self):
	103	return self.path2id('')
	104
2564.2.1 by Ian Clatworthy refactor commit to support alternative population meothds	105	def _comparison_data(self, entry, path):
	106	"""See Tree._comparison_data."""
	107	if entry is None:
	108	return None, False, None
	109	return entry.kind, entry.executable, None
	110
3567.5.1 by John Arbash Meinel Implement rename_one on MemoryTree, and expose that in the Branch Builder	111	@needs_tree_write_lock
	112	def rename_one(self, from_rel, to_rel):
	113	file_id = self.path2id(from_rel)
	114	to_dir, to_tail = os.path.split(to_rel)
3514.4.44 by John Arbash Meinel Revert the path2id fix, because to_dir can be anywhere, not just	115	to_parent_id = self.path2id(to_dir)
3567.5.1 by John Arbash Meinel Implement rename_one on MemoryTree, and expose that in the Branch Builder	116	self._file_transport.move(from_rel, to_rel)
	117	self._inventory.rename(file_id, to_parent_id, to_tail)
3514.4.38 by John Arbash Meinel Use direct access to the inventory instead of path2id.	118
2776.4.2 by Robert Collins nuke _read_tree_state and snapshot from inventory, moving responsibility into the commit builder.	119	def path_content_summary(self, path):
	120	"""See Tree.path_content_summary."""
	121	id = self.path2id(path)
	122	if id is None:
	123	return 'missing', None, None, None
	124	kind = self.kind(id)
	125	if kind == 'file':
	126	bytes = self._file_transport.get_bytes(path)
	127	size = len(bytes)
	128	executable = self._inventory[id].executable
	129	sha1 = None # no stat cache
	130	return (kind, size, executable, sha1)
	131	elif kind == 'directory':
	132	# memory tree does not support nested trees yet.
	133	return kind, None, None, None
	134	elif kind == 'symlink':
	135	raise NotImplementedError('symlink support')
	136	else:
	137	raise NotImplementedError('unknown kind')
	138
2564.2.1 by Ian Clatworthy refactor commit to support alternative population meothds	139	def _file_size(self, entry, stat_value):
	140	"""See Tree._file_size."""
	141	if entry is None:
	142	return 0
	143	return entry.text_size
	144
1986.1.2 by Robert Collins Various changes to allow non-workingtree specific tests to run entirely	145	@needs_read_lock
	146	def get_parent_ids(self):
	147	"""See Tree.get_parent_ids.
	148
	149	This implementation returns the current cached value from
	150	self._parent_ids.
	151	"""
	152	return list(self._parent_ids)
	153
	154	def has_filename(self, filename):
	155	"""See Tree.has_filename()."""
	156	return self._file_transport.has(filename)
	157
	158	def is_executable(self, file_id, path=None):
	159	return self._inventory[file_id].executable
	160
1959.4.2 by Aaron Bentley Merge bzr.dev	161	def kind(self, file_id):
	162	return self._inventory[file_id].kind
	163
1986.1.2 by Robert Collins Various changes to allow non-workingtree specific tests to run entirely	164	def mkdir(self, path, file_id=None):
	165	"""See MutableTree.mkdir()."""
	166	self.add(path, file_id, 'directory')
	167	if file_id is None:
	168	file_id = self.path2id(path)
	169	self._file_transport.mkdir(path)
	170	return file_id
	171
1986.1.6 by Robert Collins Add MemoryTree.last_revision.	172	@needs_read_lock
	173	def last_revision(self):
	174	"""See MutableTree.last_revision."""
	175	return self._branch_revision_id
	176
1986.1.2 by Robert Collins Various changes to allow non-workingtree specific tests to run entirely	177	def lock_read(self):
	178	"""Lock the memory tree for reading.
	179
	180	This triggers population of data from the branch for its revision.
	181	"""
	182	self._locks += 1
	183	try:
	184	if self._locks == 1:
	185	self.branch.lock_read()
	186	self._lock_mode = "r"
	187	self._populate_from_branch()
	188	except:
	189	self._locks -= 1
	190	raise
	191
1986.1.8 by Robert Collins Update to bzr.dev, which involves adding lock_tree_write to MutableTree and MemoryTree.	192	def lock_tree_write(self):
	193	"""See MutableTree.lock_tree_write()."""
	194	self._locks += 1
	195	try:
	196	if self._locks == 1:
	197	self.branch.lock_read()
	198	self._lock_mode = "w"
	199	self._populate_from_branch()
	200	elif self._lock_mode == "r":
	201	raise errors.ReadOnlyError(self)
	202	except:
	203	self._locks -= 1
	204	raise
	205
1986.1.2 by Robert Collins Various changes to allow non-workingtree specific tests to run entirely	206	def lock_write(self):
	207	"""See MutableTree.lock_write()."""
	208	self._locks += 1
	209	try:
	210	if self._locks == 1:
	211	self.branch.lock_write()
	212	self._lock_mode = "w"
	213	self._populate_from_branch()
	214	elif self._lock_mode == "r":
	215	raise errors.ReadOnlyError(self)
	216	except:
	217	self._locks -= 1
	218	raise
	219
	220	def _populate_from_branch(self):
	221	"""Populate the in-tree state from the branch."""
4190.1.4 by Robert Collins Cache ghosts when we can get them from a RemoteRepository in get_parent_map.	222	self._set_basis()
3668.5.4 by Jelmer Vernooij Eliminate more uses of Repository.revision_tree(None).	223	if self._branch_revision_id == _mod_revision.NULL_REVISION:
1986.1.2 by Robert Collins Various changes to allow non-workingtree specific tests to run entirely	224	self._parent_ids = []
	225	else:
	226	self._parent_ids = [self._branch_revision_id]
5802.1.1 by Jelmer Vernooij Move Inventory._get_mutable_inventory -> mutable_inventory_from_tree.	227	self._inventory = Inventory(None, self._basis_tree.get_revision_id())
1986.1.2 by Robert Collins Various changes to allow non-workingtree specific tests to run entirely	228	self._file_transport = MemoryTransport()
	229	# TODO copy the revision trees content, or do it lazy, or something.
5802.1.1 by Jelmer Vernooij Move Inventory._get_mutable_inventory -> mutable_inventory_from_tree.	230	inventory_entries = self._basis_tree.iter_entries_by_dir()
1986.1.2 by Robert Collins Various changes to allow non-workingtree specific tests to run entirely	231	for path, entry in inventory_entries:
5802.1.1 by Jelmer Vernooij Move Inventory._get_mutable_inventory -> mutable_inventory_from_tree.	232	self._inventory.add(entry.copy())
1731.1.50 by Aaron Bentley Merge bzr.dev	233	if path == '':
1731.1.50 by Aaron Bentley Merge bzr.dev	234	continue
1986.1.2 by Robert Collins Various changes to allow non-workingtree specific tests to run entirely	235	if entry.kind == 'directory':
	236	self._file_transport.mkdir(path)
	237	elif entry.kind == 'file':
1986.1.4 by Robert Collins Fixup deprecations from bzr.dev.	238	self._file_transport.put_file(path,
1986.1.2 by Robert Collins Various changes to allow non-workingtree specific tests to run entirely	239	self._basis_tree.get_file(entry.file_id))
	240	else:
	241	raise NotImplementedError(self._populate_from_branch)
	242
	243	def put_file_bytes_non_atomic(self, file_id, bytes):
	244	"""See MutableTree.put_file_bytes_non_atomic."""
1986.1.4 by Robert Collins Fixup deprecations from bzr.dev.	245	self._file_transport.put_bytes(self.id2path(file_id), bytes)
1986.1.2 by Robert Collins Various changes to allow non-workingtree specific tests to run entirely	246
	247	def unlock(self):
	248	"""Release a lock.
	249
	250	This frees all cached state when the last lock context for the tree is
	251	left.
	252	"""
	253	if self._locks == 1:
	254	self._basis_tree = None
	255	self._parent_ids = []
	256	self._inventory = None
	257	try:
	258	self.branch.unlock()
	259	finally:
	260	self._locks = 0
	261	self._lock_mode = None
	262	else:
	263	self._locks -= 1
	264
1986.1.8 by Robert Collins Update to bzr.dev, which involves adding lock_tree_write to MutableTree and MemoryTree.	265	@needs_tree_write_lock
1986.1.3 by Robert Collins Merge bzr.dev.	266	def unversion(self, file_ids):
	267	"""Remove the file ids in file_ids from the current versioned set.
	268
	269	When a file_id is unversioned, all of its children are automatically
	270	unversioned.
	271
	272	:param file_ids: The file ids to stop versioning.
	273	:raises: NoSuchId if any fileid is not currently versioned.
	274	"""
	275	# XXX: This should be in mutabletree, but the inventory-save action
	276	# is not relevant to memory tree. Until that is done in unlock by
	277	# working tree, we cannot share the implementation.
	278	for file_id in file_ids:
	279	if self._inventory.has_id(file_id):
	280	self._inventory.remove_recursive_id(file_id)
	281	else:
	282	raise errors.NoSuchId(self, file_id)
	283
2418.5.1 by John Arbash Meinel Make a Branch helper which can create a very basic MemoryTree with history.	284	def set_parent_ids(self, revision_ids, allow_leftmost_as_ghost=False):
	285	"""See MutableTree.set_parent_trees()."""
2598.5.2 by Aaron Bentley Got all tests passing with Branch returning 'null:' for null revision	286	for revision_id in revision_ids:
	287	_mod_revision.check_not_reserved_id(revision_id)
2418.5.1 by John Arbash Meinel Make a Branch helper which can create a very basic MemoryTree with history.	288	if len(revision_ids) == 0:
	289	self._parent_ids = []
4190.1.4 by Robert Collins Cache ghosts when we can get them from a RemoteRepository in get_parent_map.	290	self._branch_revision_id = _mod_revision.NULL_REVISION
2418.5.1 by John Arbash Meinel Make a Branch helper which can create a very basic MemoryTree with history.	291	else:
	292	self._parent_ids = revision_ids
	293	self._branch_revision_id = revision_ids[0]
4190.1.4 by Robert Collins Cache ghosts when we can get them from a RemoteRepository in get_parent_map.	294	self._allow_leftmost_as_ghost = allow_leftmost_as_ghost
	295	self._set_basis()
	296
	297	def _set_basis(self):
	298	try:
	299	self._basis_tree = self.branch.repository.revision_tree(
	300	self._branch_revision_id)
	301	except errors.NoSuchRevision:
	302	if self._allow_leftmost_as_ghost:
	303	self._basis_tree = self.branch.repository.revision_tree(
	304	_mod_revision.NULL_REVISION)
	305	else:
	306	raise
2418.5.1 by John Arbash Meinel Make a Branch helper which can create a very basic MemoryTree with history.	307
1986.1.2 by Robert Collins Various changes to allow non-workingtree specific tests to run entirely	308	def set_parent_trees(self, parents_list, allow_leftmost_as_ghost=False):
	309	"""See MutableTree.set_parent_trees()."""
	310	if len(parents_list) == 0:
	311	self._parent_ids = []
3668.5.1 by Jelmer Vernooij Use NULL_REVISION rather than None for Repository.revision_tree().	312	self._basis_tree = self.branch.repository.revision_tree(
	313	_mod_revision.NULL_REVISION)
1986.1.2 by Robert Collins Various changes to allow non-workingtree specific tests to run entirely	314	else:
	315	if parents_list[0][1] is None and not allow_leftmost_as_ghost:
	316	# a ghost in the left most parent
	317	raise errors.GhostRevisionUnusableHere(parents_list[0][0])
	318	self._parent_ids = [parent_id for parent_id, tree in parents_list]
2598.5.2 by Aaron Bentley Got all tests passing with Branch returning 'null:' for null revision	319	if parents_list[0][1] is None or parents_list[0][1] == 'null:':
3668.5.1 by Jelmer Vernooij Use NULL_REVISION rather than None for Repository.revision_tree().	320	self._basis_tree = self.branch.repository.revision_tree(
	321	_mod_revision.NULL_REVISION)
1986.1.2 by Robert Collins Various changes to allow non-workingtree specific tests to run entirely	322	else:
	323	self._basis_tree = parents_list[0][1]
1986.1.6 by Robert Collins Add MemoryTree.last_revision.	324	self._branch_revision_id = parents_list[0][0]