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# Copyright (C) 2006, 2007 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
"""MutableTree object.
See MutableTree for more details.
"""
from bzrlib import (
errors,
osutils,
tree,
)
from bzrlib.decorators import needs_read_lock, needs_write_lock
from bzrlib.osutils import splitpath
from bzrlib.symbol_versioning import DEPRECATED_PARAMETER
def needs_tree_write_lock(unbound):
"""Decorate unbound to take out and release a tree_write lock."""
def tree_write_locked(self, *args, **kwargs):
self.lock_tree_write()
try:
return unbound(self, *args, **kwargs)
finally:
self.unlock()
tree_write_locked.__doc__ = unbound.__doc__
tree_write_locked.__name__ = unbound.__name__
return tree_write_locked
class MutableTree(tree.Tree):
"""A MutableTree is a specialisation of Tree which is able to be mutated.
Generally speaking these mutations are only possible within a lock_write
context, and will revert if the lock is broken abnormally - but this cannot
be guaranteed - depending on the exact implementation of the mutable state.
The most common form of Mutable Tree is WorkingTree, see bzrlib.workingtree.
For tests we also have MemoryTree which is a MutableTree whose contents are
entirely in memory.
For now, we are not treating MutableTree as an interface to provide
conformance tests for - rather we are testing MemoryTree specifically, and
interface testing implementations of WorkingTree.
A mutable tree always has an associated Branch and BzrDir object - the
branch and bzrdir attributes.
"""
@needs_tree_write_lock
def add(self, files, ids=None, kinds=None):
"""Add paths to the set of versioned paths.
Note that the command line normally calls smart_add instead,
which can automatically recurse.
This adds the files to the inventory, so that they will be
recorded by the next commit.
:param files: List of paths to add, relative to the base of the tree.
:param ids: If set, use these instead of automatically generated ids.
Must be the same length as the list of files, but may
contain None for ids that are to be autogenerated.
:param kinds: Optional parameter to specify the kinds to be used for
each file.
TODO: Perhaps callback with the ids and paths as they're added.
"""
if isinstance(files, basestring):
assert(ids is None or isinstance(ids, basestring))
assert(kinds is None or isinstance(kinds, basestring))
files = [files]
if ids is not None:
ids = [ids]
if kinds is not None:
kinds = [kinds]
files = [path.strip('/') for path in files]
if ids is None:
ids = [None] * len(files)
else:
assert(len(ids) == len(files))
ids = [osutils.safe_file_id(file_id) for file_id in ids]
if kinds is None:
kinds = [None] * len(files)
else:
assert(len(kinds) == len(files))
for f in files:
# generic constraint checks:
if self.is_control_filename(f):
raise errors.ForbiddenControlFileError(filename=f)
fp = splitpath(f)
# fill out file kinds for all files [not needed when we stop
# caring about the instantaneous file kind within a uncommmitted tree
#
self._gather_kinds(files, kinds)
self._add(files, ids, kinds)
def add_reference(self, sub_tree):
"""Add a TreeReference to the tree, pointing at sub_tree"""
raise errors.UnsupportedOperation(self.add_reference, self)
def _add_reference(self, sub_tree):
"""Standard add_reference implementation, for use by subclasses"""
try:
sub_tree_path = self.relpath(sub_tree.basedir)
except errors.PathNotChild:
raise errors.BadReferenceTarget(self, sub_tree,
'Target not inside tree.')
sub_tree_id = sub_tree.get_root_id()
if sub_tree_id == self.get_root_id():
raise errors.BadReferenceTarget(self, sub_tree,
'Trees have the same root id.')
if sub_tree_id in self.inventory:
raise errors.BadReferenceTarget(self, sub_tree,
'Root id already present in tree')
self._add([sub_tree_path], [sub_tree_id], ['tree-reference'])
def _add(self, files, ids, kinds):
"""Helper function for add - updates the inventory.
:param files: sequence of pathnames, relative to the tree root
:param ids: sequence of suggested ids for the files (may be None)
:param kinds: sequence of inventory kinds of the files (i.e. may
contain "tree-reference")
"""
raise NotImplementedError(self._add)
@needs_write_lock
def commit(self, message=None, revprops=None, *args,
**kwargs):
# avoid circular imports
from bzrlib import commit
if revprops is None:
revprops = {}
if not 'branch-nick' in revprops:
revprops['branch-nick'] = self.branch.nick
# args for wt.commit start at message from the Commit.commit method,
args = (message, ) + args
committed_id = commit.Commit().commit(working_tree=self,
revprops=revprops, *args, **kwargs)
return committed_id
def _gather_kinds(self, files, kinds):
"""Helper function for add - sets the entries of kinds."""
raise NotImplementedError(self._gather_kinds)
@needs_read_lock
def last_revision(self):
"""Return the revision id of the last commit performed in this tree.
In early tree formats the result of last_revision is the same as the
branch last_revision, but that is no longer the case for modern tree
formats.
last_revision returns the left most parent id, or None if there are no
parents.
last_revision was deprecated as of 0.11. Please use get_parent_ids
instead.
"""
raise NotImplementedError(self.last_revision)
def lock_tree_write(self):
"""Lock the working tree for write, and the branch for read.
This is useful for operations which only need to mutate the working
tree. Taking out branch write locks is a relatively expensive process
and may fail if the branch is on read only media. So branch write locks
should only be taken out when we are modifying branch data - such as in
operations like commit, pull, uncommit and update.
"""
raise NotImplementedError(self.lock_tree_write)
def lock_write(self):
"""Lock the tree and its branch. This allows mutating calls to be made.
Some mutating methods will take out implicit write locks, but in
general you should always obtain a write lock before calling mutating
methods on a tree.
"""
raise NotImplementedError(self.lock_write)
@needs_write_lock
def mkdir(self, path, file_id=None):
"""Create a directory in the tree. if file_id is None, one is assigned.
:param path: A unicode file path.
:param file_id: An optional file-id.
:return: the file id of the new directory.
"""
raise NotImplementedError(self.mkdir)
def set_parent_trees(self, parents_list, allow_leftmost_as_ghost=False):
"""Set the parents of the working tree.
:param parents_list: A list of (revision_id, tree) tuples.
If tree is None, then that element is treated as an unreachable
parent tree - i.e. a ghost.
"""
raise NotImplementedError(self.set_parent_trees)
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