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# Copyright (C) 2010 Canonical Ltd
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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"""ControlDir is the basic control directory class.
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The ControlDir class is the base for the control directory used
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by all bzr and foreign formats. For the ".bzr" implementation,
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see bzrlib.bzrdir.BzrDir.
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from bzrlib.lazy_import import lazy_import
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lazy_import(globals(), """
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revision as _mod_revision,
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from bzrlib.push import (
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from bzrlib.trace import (
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from bzrlib.transport import (
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class ControlComponent(object):
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"""Abstract base class for control directory components.
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This provides interfaces that are common across bzrdirs,
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repositories, branches, and workingtree control directories.
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They all expose two urls and transports: the *user* URL is the
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one that stops above the control directory (eg .bzr) and that
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should normally be used in messages, and the *control* URL is
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under that in eg .bzr/checkout and is used to read the control
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This can be used as a mixin and is intended to fit with
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def control_transport(self):
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raise NotImplementedError
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def control_url(self):
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return self.control_transport.base
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def user_transport(self):
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raise NotImplementedError
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return self.user_transport.base
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class ControlDir(ControlComponent):
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"""A control directory."""
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def can_convert_format(self):
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"""Return true if this bzrdir is one whose format we can convert from."""
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def list_branches(self):
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"""Return a sequence of all branches local to this control directory.
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return [self.open_branch()]
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except (errors.NotBranchError, errors.NoRepositoryPresent):
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def is_control_filename(self, filename):
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"""True if filename is the name of a path which is reserved for bzrdir's.
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:param filename: A filename within the root transport of this bzrdir.
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This is true IF and ONLY IF the filename is part of the namespace reserved
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for bzr control dirs. Currently this is the '.bzr' directory in the root
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of the root_transport. it is expected that plugins will need to extend
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this in the future - for instance to make bzr talk with svn working
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raise NotImplementedError(self.is_control_filename)
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def needs_format_conversion(self, format=None):
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"""Return true if this bzrdir needs convert_format run on it.
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For instance, if the repository format is out of date but the
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branch and working tree are not, this should return True.
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:param format: Optional parameter indicating a specific desired
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format we plan to arrive at.
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raise NotImplementedError(self.needs_format_conversion)
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def destroy_repository(self):
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"""Destroy the repository in this BzrDir"""
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raise NotImplementedError(self.destroy_repository)
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def create_branch(self, name=None):
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"""Create a branch in this BzrDir.
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:param name: Name of the colocated branch to create, None for
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The bzrdir's format will control what branch format is created.
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For more control see BranchFormatXX.create(a_bzrdir).
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raise NotImplementedError(self.create_branch)
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def destroy_branch(self, name=None):
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"""Destroy a branch in this BzrDir.
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:param name: Name of the branch to destroy, None for the default
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raise NotImplementedError(self.destroy_branch)
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def create_workingtree(self, revision_id=None, from_branch=None,
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accelerator_tree=None, hardlink=False):
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"""Create a working tree at this BzrDir.
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:param revision_id: create it as of this revision id.
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:param from_branch: override bzrdir branch (for lightweight checkouts)
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:param accelerator_tree: A tree which can be used for retrieving file
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contents more quickly than the revision tree, i.e. a workingtree.
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The revision tree will be used for cases where accelerator_tree's
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content is different.
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raise NotImplementedError(self.create_workingtree)
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def destroy_workingtree(self):
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"""Destroy the working tree at this BzrDir.
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Formats that do not support this may raise UnsupportedOperation.
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raise NotImplementedError(self.destroy_workingtree)
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def destroy_workingtree_metadata(self):
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"""Destroy the control files for the working tree at this BzrDir.
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The contents of working tree files are not affected.
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Formats that do not support this may raise UnsupportedOperation.
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raise NotImplementedError(self.destroy_workingtree_metadata)
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def get_branch_reference(self, name=None):
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"""Return the referenced URL for the branch in this bzrdir.
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:param name: Optional colocated branch name
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:raises NotBranchError: If there is no Branch.
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:raises NoColocatedBranchSupport: If a branch name was specified
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but colocated branches are not supported.
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:return: The URL the branch in this bzrdir references if it is a
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reference branch, or None for regular branches.
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raise errors.NoColocatedBranchSupport(self)
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def get_branch_transport(self, branch_format, name=None):
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"""Get the transport for use by branch format in this BzrDir.
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Note that bzr dirs that do not support format strings will raise
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IncompatibleFormat if the branch format they are given has
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a format string, and vice versa.
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If branch_format is None, the transport is returned with no
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checking. If it is not None, then the returned transport is
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guaranteed to point to an existing directory ready for use.
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raise NotImplementedError(self.get_branch_transport)
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def get_repository_transport(self, repository_format):
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"""Get the transport for use by repository format in this BzrDir.
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Note that bzr dirs that do not support format strings will raise
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IncompatibleFormat if the repository format they are given has
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a format string, and vice versa.
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If repository_format is None, the transport is returned with no
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checking. If it is not None, then the returned transport is
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guaranteed to point to an existing directory ready for use.
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raise NotImplementedError(self.get_repository_transport)
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def get_workingtree_transport(self, tree_format):
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"""Get the transport for use by workingtree format in this BzrDir.
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Note that bzr dirs that do not support format strings will raise
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IncompatibleFormat if the workingtree format they are given has a
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format string, and vice versa.
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If workingtree_format is None, the transport is returned with no
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checking. If it is not None, then the returned transport is
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guaranteed to point to an existing directory ready for use.
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raise NotImplementedError(self.get_workingtree_transport)
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def open_branch(self, name=None, unsupported=False,
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ignore_fallbacks=False):
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"""Open the branch object at this BzrDir if one is present.
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If unsupported is True, then no longer supported branch formats can
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TODO: static convenience version of this?
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raise NotImplementedError(self.open_branch)
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def open_repository(self, _unsupported=False):
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"""Open the repository object at this BzrDir if one is present.
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This will not follow the Branch object pointer - it's strictly a direct
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open facility. Most client code should use open_branch().repository to
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:param _unsupported: a private parameter, not part of the api.
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TODO: static convenience version of this?
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raise NotImplementedError(self.open_repository)
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def find_repository(self):
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"""Find the repository that should be used.
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This does not require a branch as we use it to find the repo for
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new branches as well as to hook existing branches up to their
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raise NotImplementedError(self.find_repository)
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def open_workingtree(self, _unsupported=False,
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recommend_upgrade=True, from_branch=None):
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"""Open the workingtree object at this BzrDir if one is present.
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:param recommend_upgrade: Optional keyword parameter, when True (the
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default), emit through the ui module a recommendation that the user
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upgrade the working tree when the workingtree being opened is old
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(but still fully supported).
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:param from_branch: override bzrdir branch (for lightweight checkouts)
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raise NotImplementedError(self.open_workingtree)
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def has_branch(self, name=None):
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"""Tell if this bzrdir contains a branch.
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Note: if you're going to open the branch, you should just go ahead
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and try, and not ask permission first. (This method just opens the
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branch and discards it, and that's somewhat expensive.)
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self.open_branch(name)
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except errors.NotBranchError:
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def has_workingtree(self):
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"""Tell if this bzrdir contains a working tree.
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This will still raise an exception if the bzrdir has a workingtree that
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is remote & inaccessible.
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Note: if you're going to open the working tree, you should just go ahead
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and try, and not ask permission first. (This method just opens the
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workingtree and discards it, and that's somewhat expensive.)
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self.open_workingtree(recommend_upgrade=False)
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except errors.NoWorkingTree:
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def cloning_metadir(self, require_stacking=False):
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"""Produce a metadir suitable for cloning or sprouting with.
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These operations may produce workingtrees (yes, even though they're
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"cloning" something that doesn't have a tree), so a viable workingtree
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format must be selected.
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:require_stacking: If True, non-stackable formats will be upgraded
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to similar stackable formats.
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:returns: a BzrDirFormat with all component formats either set
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appropriately or set to None if that component should not be
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raise NotImplementedError(self.cloning_metadir)
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def checkout_metadir(self):
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"""Produce a metadir suitable for checkouts of this controldir."""
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return self.cloning_metadir()
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def sprout(self, url, revision_id=None, force_new_repo=False,
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recurse='down', possible_transports=None,
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accelerator_tree=None, hardlink=False, stacked=False,
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source_branch=None, create_tree_if_local=True):
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"""Create a copy of this bzrdir prepared for use as a new line of
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If url's last component does not exist, it will be created.
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Attributes related to the identity of the source branch like
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branch nickname will be cleaned, a working tree is created
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whether one existed before or not; and a local branch is always
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if revision_id is not None, then the clone operation may tune
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itself to download less data.
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:param accelerator_tree: A tree which can be used for retrieving file
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contents more quickly than the revision tree, i.e. a workingtree.
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The revision tree will be used for cases where accelerator_tree's
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content is different.
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:param hardlink: If true, hard-link files from accelerator_tree,
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:param stacked: If true, create a stacked branch referring to the
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location of this control directory.
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:param create_tree_if_local: If true, a working-tree will be created
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when working locally.
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target_transport = get_transport(url, possible_transports)
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target_transport.ensure_base()
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cloning_format = self.cloning_metadir(stacked)
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# Create/update the result branch
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result = cloning_format.initialize_on_transport(target_transport)
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# if a stacked branch wasn't requested, we don't create one
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# even if the origin was stacked
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stacked_branch_url = None
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if source_branch is not None:
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stacked_branch_url = self.root_transport.base
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source_repository = source_branch.repository
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source_branch = self.open_branch()
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source_repository = source_branch.repository
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stacked_branch_url = self.root_transport.base
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except errors.NotBranchError:
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source_repository = self.open_repository()
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except errors.NoRepositoryPresent:
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source_repository = None
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repository_policy = result.determine_repository_policy(
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force_new_repo, stacked_branch_url, require_stacking=stacked)
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result_repo, is_new_repo = repository_policy.acquire_repository()
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is_stacked = stacked or (len(result_repo._fallback_repositories) != 0)
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if is_new_repo and revision_id is not None and not is_stacked:
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fetch_spec = graph.PendingAncestryResult(
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[revision_id], source_repository)
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if source_repository is not None:
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# Fetch while stacked to prevent unstacked fetch from
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if fetch_spec is None:
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result_repo.fetch(source_repository, revision_id=revision_id)
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result_repo.fetch(source_repository, fetch_spec=fetch_spec)
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if source_branch is None:
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# this is for sprouting a bzrdir without a branch; is that
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# Not especially, but it's part of the contract.
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result_branch = result.create_branch()
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result_branch = source_branch.sprout(result,
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revision_id=revision_id, repository_policy=repository_policy)
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mutter("created new branch %r" % (result_branch,))
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# Create/update the result working tree
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if (create_tree_if_local and
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isinstance(target_transport, local.LocalTransport) and
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(result_repo is None or result_repo.make_working_trees())):
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wt = result.create_workingtree(accelerator_tree=accelerator_tree,
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if wt.path2id('') is None:
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wt.set_root_id(self.open_workingtree.get_root_id())
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except errors.NoWorkingTree:
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if recurse == 'down':
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basis = wt.basis_tree()
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subtrees = basis.iter_references()
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elif result_branch is not None:
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basis = result_branch.basis_tree()
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subtrees = basis.iter_references()
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elif source_branch is not None:
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basis = source_branch.basis_tree()
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subtrees = basis.iter_references()
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for path, file_id in subtrees:
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target = urlutils.join(url, urlutils.escape(path))
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sublocation = source_branch.reference_parent(file_id, path)
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sublocation.bzrdir.sprout(target,
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basis.get_reference_revision(file_id, path),
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force_new_repo=force_new_repo, recurse=recurse,
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if basis is not None:
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def push_branch(self, source, revision_id=None, overwrite=False,
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remember=False, create_prefix=False):
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"""Push the source branch into this BzrDir."""
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# If we can open a branch, use its direct repository, otherwise see
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# if there is a repository without a branch.
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br_to = self.open_branch()
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except errors.NotBranchError:
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# Didn't find a branch, can we find a repository?
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repository_to = self.find_repository()
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# Found a branch, so we must have found a repository
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repository_to = br_to.repository
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push_result = PushResult()
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push_result.source_branch = source
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# We have a repository but no branch, copy the revisions, and then
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repository_to.fetch(source.repository, revision_id=revision_id)
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br_to = source.clone(self, revision_id=revision_id)
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if source.get_push_location() is None or remember:
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source.set_push_location(br_to.base)
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push_result.stacked_on = None
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push_result.branch_push_result = None
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push_result.old_revno = None
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push_result.old_revid = _mod_revision.NULL_REVISION
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push_result.target_branch = br_to
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push_result.master_branch = None
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push_result.workingtree_updated = False
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# We have successfully opened the branch, remember if necessary:
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if source.get_push_location() is None or remember:
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source.set_push_location(br_to.base)
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tree_to = self.open_workingtree()
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except errors.NotLocalUrl:
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push_result.branch_push_result = source.push(br_to,
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overwrite, stop_revision=revision_id)
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push_result.workingtree_updated = False
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except errors.NoWorkingTree:
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push_result.branch_push_result = source.push(br_to,
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overwrite, stop_revision=revision_id)
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push_result.workingtree_updated = None # Not applicable
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push_result.branch_push_result = source.push(
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tree_to.branch, overwrite, stop_revision=revision_id)
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push_result.workingtree_updated = True
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push_result.old_revno = push_result.branch_push_result.old_revno
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push_result.old_revid = push_result.branch_push_result.old_revid
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push_result.target_branch = \
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push_result.branch_push_result.target_branch
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def create(cls, base, format=None, possible_transports=None):
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"""Create a new BzrDir at the url 'base'.
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:param format: If supplied, the format of branch to create. If not
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supplied, the default is used.
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:param possible_transports: If supplied, a list of transports that
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can be reused to share a remote connection.
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if cls is not ControlDir:
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from bzrlib.bzrdir import BzrDir
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pass # FIXME: Deprecationwarning
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raise AssertionError("ControlDir.create always creates the"
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"default format, not one of %r" % cls)
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t = get_transport(base, possible_transports)
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format = ControlDirFormat.get_default_format()
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return format.initialize_on_transport(t)
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class ControlDirFormat(object):
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"""An encapsulation of the initialization and open routines for a format.
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Formats provide three things:
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* An initialization routine,
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Formats are placed in a dict by their format string for reference
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during bzrdir opening. These should be subclasses of BzrDirFormat
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Once a format is deprecated, just deprecate the initialize and open
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methods on the format class. Do not deprecate the object, as the
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object will be created every system load.
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:cvar colocated_branches: Whether this formats supports colocated branches.
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_default_format = None
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"""The default format used for new control directories."""
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"""The registered control formats - .bzr, ....
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This is a list of ControlDirFormat objects.
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"""The registered server format probers, e.g. RemoteBzrProber.
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This is a list of Prober-derived classes.
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"""The registered format probers, e.g. BzrProber.
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This is a list of Prober-derived classes.
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colocated_branches = False
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"""Whether co-located branches are supported for this control dir format.
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def get_format_description(self):
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"""Return the short description for this format."""
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raise NotImplementedError(self.get_format_description)
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def get_converter(self, format=None):
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"""Return the converter to use to convert bzrdirs needing converts.
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This returns a bzrlib.bzrdir.Converter object.
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This should return the best upgrader to step this format towards the
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current default format. In the case of plugins we can/should provide
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some means for them to extend the range of returnable converters.
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:param format: Optional format to override the default format of the
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raise NotImplementedError(self.get_converter)
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def is_supported(self):
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"""Is this format supported?
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Supported formats must be initializable and openable.
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Unsupported formats may not support initialization or committing or
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some other features depending on the reason for not being supported.
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def same_model(self, target_format):
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return (self.repository_format.rich_root_data ==
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target_format.rich_root_data)
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def register_format(klass, format):
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"""Register a format that does not use '.bzr' for its control dir.
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klass._formats.append(format)
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def register_prober(klass, prober):
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"""Register a prober that can look for a control dir.
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klass._probers.append(prober)
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def unregister_prober(klass, prober):
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"""Unregister a prober.
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klass._probers.remove(prober)
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def register_server_prober(klass, prober):
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"""Register a control format prober for client-server environments.
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These probers will be used before ones registered with
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register_prober. This gives implementations that decide to the
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chance to grab it before anything looks at the contents of the format
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klass._server_probers.append(prober)
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return self.get_format_description().rstrip()
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def unregister_format(klass, format):
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klass._formats.remove(format)
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def known_formats(klass):
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"""Return all the known formats.
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return set(klass._formats)
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def find_format(klass, transport, _server_formats=True):
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"""Return the format present at transport."""
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_probers = klass._server_probers + klass._probers
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_probers = klass._probers
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for prober_kls in _probers:
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prober = prober_kls()
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return prober.probe_transport(transport)
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except errors.NotBranchError:
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# this format does not find a control dir here.
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raise errors.NotBranchError(path=transport.base)
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def initialize(self, url, possible_transports=None):
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"""Create a control dir at this url and return an opened copy.
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While not deprecated, this method is very specific and its use will
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lead to many round trips to setup a working environment. See
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initialize_on_transport_ex for a [nearly] all-in-one method.
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Subclasses should typically override initialize_on_transport
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instead of this method.
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return self.initialize_on_transport(get_transport(url,
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possible_transports))
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def initialize_on_transport(self, transport):
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"""Initialize a new bzrdir in the base directory of a Transport."""
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raise NotImplementedError(self.initialize_on_transport)
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def initialize_on_transport_ex(self, transport, use_existing_dir=False,
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create_prefix=False, force_new_repo=False, stacked_on=None,
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stack_on_pwd=None, repo_format_name=None, make_working_trees=None,
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shared_repo=False, vfs_only=False):
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"""Create this format on transport.
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The directory to initialize will be created.
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:param force_new_repo: Do not use a shared repository for the target,
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even if one is available.
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:param create_prefix: Create any missing directories leading up to
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:param use_existing_dir: Use an existing directory if one exists.
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:param stacked_on: A url to stack any created branch on, None to follow
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any target stacking policy.
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:param stack_on_pwd: If stack_on is relative, the location it is
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:param repo_format_name: If non-None, a repository will be
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made-or-found. Should none be found, or if force_new_repo is True
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the repo_format_name is used to select the format of repository to
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:param make_working_trees: Control the setting of make_working_trees
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for a new shared repository when one is made. None to use whatever
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default the format has.
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:param shared_repo: Control whether made repositories are shared or
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:param vfs_only: If True do not attempt to use a smart server
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:return: repo, bzrdir, require_stacking, repository_policy. repo is
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None if none was created or found, bzrdir is always valid.
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require_stacking is the result of examining the stacked_on
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parameter and any stacking policy found for the target.
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raise NotImplementedError(self.initialize_on_transport_ex)
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def network_name(self):
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"""A simple byte string uniquely identifying this format for RPC calls.
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Bzr control formats use this disk format string to identify the format
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over the wire. Its possible that other control formats have more
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complex detection requirements, so we permit them to use any unique and
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immutable string they desire.
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raise NotImplementedError(self.network_name)
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def open(self, transport, _found=False):
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"""Return an instance of this format for the dir transport points at.
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raise NotImplementedError(self.open)
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def _set_default_format(klass, format):
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"""Set default format (for testing behavior of defaults only)"""
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klass._default_format = format
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def get_default_format(klass):
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"""Return the current default format."""
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return klass._default_format
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class Prober(object):
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"""Abstract class that can be used to detect a particular kind of
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At the moment this just contains a single method to probe a particular
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transport, but it may be extended in the future to e.g. avoid
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multiple levels of probing for Subversion repositories.
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def probe_transport(self, transport):
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"""Return the controldir style format present in a directory.
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:raise UnknownFormatError: If a control dir was found but is
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in an unknown format.
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:raise NotBranchError: If no control directory was found.
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:return: A ControlDirFormat instance.
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raise NotImplementedError(self.probe_transport)
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class BzrDirFormatInfo(object):
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def __init__(self, native, deprecated, hidden, experimental):
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self.deprecated = deprecated
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self.experimental = experimental
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class ControlDirFormatRegistry(registry.Registry):
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"""Registry of user-selectable BzrDir subformats.
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Differs from ControlDirFormat._formats in that it provides sub-formats,
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e.g. BzrDirMeta1 with weave repository. Also, it's more user-oriented.
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"""Create a BzrDirFormatRegistry."""
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self._aliases = set()
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self._registration_order = list()
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super(ControlDirFormatRegistry, self).__init__()
781
"""Return a set of the format names which are aliases."""
782
return frozenset(self._aliases)
784
def register(self, key, factory, help, native=True, deprecated=False,
785
hidden=False, experimental=False, alias=False):
786
"""Register a BzrDirFormat factory.
788
The factory must be a callable that takes one parameter: the key.
789
It must produce an instance of the BzrDirFormat when called.
791
This function mainly exists to prevent the info object from being
794
registry.Registry.register(self, key, factory, help,
795
BzrDirFormatInfo(native, deprecated, hidden, experimental))
797
self._aliases.add(key)
798
self._registration_order.append(key)
800
def register_lazy(self, key, module_name, member_name, help, native=True,
801
deprecated=False, hidden=False, experimental=False, alias=False):
802
registry.Registry.register_lazy(self, key, module_name, member_name,
803
help, BzrDirFormatInfo(native, deprecated, hidden, experimental))
805
self._aliases.add(key)
806
self._registration_order.append(key)
808
def set_default(self, key):
809
"""Set the 'default' key to be a clone of the supplied key.
811
This method must be called once and only once.
813
registry.Registry.register(self, 'default', self.get(key),
814
self.get_help(key), info=self.get_info(key))
815
self._aliases.add('default')
817
def set_default_repository(self, key):
818
"""Set the FormatRegistry default and Repository default.
820
This is a transitional method while Repository.set_default_format
823
if 'default' in self:
824
self.remove('default')
825
self.set_default(key)
826
format = self.get('default')()
828
def make_bzrdir(self, key):
829
return self.get(key)()
831
def help_topic(self, topic):
833
default_realkey = None
834
default_help = self.get_help('default')
836
for key in self._registration_order:
839
help = self.get_help(key)
840
if help == default_help:
841
default_realkey = key
843
help_pairs.append((key, help))
845
def wrapped(key, help, info):
847
help = '(native) ' + help
848
return ':%s:\n%s\n\n' % (key,
849
textwrap.fill(help, initial_indent=' ',
850
subsequent_indent=' ',
851
break_long_words=False))
852
if default_realkey is not None:
853
output += wrapped(default_realkey, '(default) %s' % default_help,
854
self.get_info('default'))
855
deprecated_pairs = []
856
experimental_pairs = []
857
for key, help in help_pairs:
858
info = self.get_info(key)
861
elif info.deprecated:
862
deprecated_pairs.append((key, help))
863
elif info.experimental:
864
experimental_pairs.append((key, help))
866
output += wrapped(key, help, info)
867
output += "\nSee :doc:`formats-help` for more about storage formats."
869
if len(experimental_pairs) > 0:
870
other_output += "Experimental formats are shown below.\n\n"
871
for key, help in experimental_pairs:
872
info = self.get_info(key)
873
other_output += wrapped(key, help, info)
876
"No experimental formats are available.\n\n"
877
if len(deprecated_pairs) > 0:
878
other_output += "\nDeprecated formats are shown below.\n\n"
879
for key, help in deprecated_pairs:
880
info = self.get_info(key)
881
other_output += wrapped(key, help, info)
884
"\nNo deprecated formats are available.\n\n"
886
"\nSee :doc:`formats-help` for more about storage formats."
888
if topic == 'other-formats':
894
# Please register new formats after old formats so that formats
895
# appear in chronological order and format descriptions can build
897
format_registry = ControlDirFormatRegistry()
added
removed
bzrlib/controldir.py
