/brz/remove-bazaar

# Copyright (C) 2006-2011 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

"""MutableTree object.

See MutableTree for more details.

"""

from __future__ import absolute_import

import operator

import os

from . import (

    errors,

    hooks,

    osutils,

    trace,

    tree,

    )

from .decorators import needs_read_lock, needs_write_lock

from .sixish import (

    text_type,

    viewvalues,

    )

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 breezy.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 ControlDir object - the

    branch and bzrdir attributes.

    """

    def __init__(self, *args, **kw):

        super(MutableTree, self).__init__(*args, **kw)

        # Is this tree on a case-insensitive or case-preserving file-system?

        # Sub-classes may initialize to False if they detect they are being

        # used on media which doesn't differentiate the case of names.

        self.case_sensitive = True

    def is_control_filename(self, filename):

        """True if filename is the name of a control file in this tree.

        :param filename: A filename within the tree. This is a relative path

            from the root of this tree.

        This is true IF and ONLY IF the filename is part of the meta data

        that bzr controls in this tree. I.E. a random .bzr directory placed

        on disk will not be a control file for this tree.

        """

        raise NotImplementedError(self.is_control_filename)

    @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, (str, text_type)):

            # XXX: Passing a single string is inconsistent and should be

            # deprecated.

            if not (ids is None or isinstance(ids, (str, text_type))):

                raise AssertionError()

            if not (kinds is None or isinstance(kinds, (str, text_type))):

                raise AssertionError()

            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:

            if not (len(ids) == len(files)):

                raise AssertionError()

        if kinds is None:

            kinds = [None] * len(files)

        elif not len(kinds) == len(files):

            raise AssertionError()

        for f in files:

            # generic constraint checks:

            if self.is_control_filename(f):

                raise errors.ForbiddenControlFileError(filename=f)

            fp = osutils.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 self.has_id(sub_tree_id):

            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)

    def apply_inventory_delta(self, changes):

        """Apply changes to the inventory as an atomic operation.

        :param changes: An inventory delta to apply to the working tree's

            inventory.

        :return None:

        :seealso Inventory.apply_delta: For details on the changes parameter.

        """

        raise NotImplementedError(self.apply_inventory_delta)

    @needs_write_lock

    def commit(self, message=None, revprops=None, *args, **kwargs):

        # avoid circular imports

        from breezy import commit

        possible_master_transports=[]

        revprops = commit.Commit.update_revprops(

                revprops,

                self.branch,

                kwargs.pop('authors', None),

                kwargs.get('local', False),

                possible_master_transports)

        # args for wt.commit start at message from the Commit.commit method,

        args = (message, ) + args

        for hook in MutableTree.hooks['start_commit']:

            hook(self)

        committed_id = commit.Commit().commit(working_tree=self,

            revprops=revprops,

            possible_master_transports=possible_master_transports,

            *args, **kwargs)

        post_hook_params = PostCommitHookParams(self)

        for hook in MutableTree.hooks['post_commit']:

            hook(post_hook_params)

        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 has_changes(self, _from_tree=None):

        """Quickly check that the tree contains at least one commitable change.

        :param _from_tree: tree to compare against to find changes (default to

            the basis tree and is intended to be used by tests).

        :return: True if a change is found. False otherwise

        """

        # Check pending merges

        if len(self.get_parent_ids()) > 1:

            return True

        if _from_tree is None:

            _from_tree = self.basis_tree()

        changes = self.iter_changes(_from_tree)

        try:

            change = next(changes)

            # Exclude root (talk about black magic... --vila 20090629)

            if change[4] == (None, None):

                change = next(changes)

            return True

        except StopIteration:

            # No changes

            return False

    @needs_read_lock

    def check_changed_or_out_of_date(self, strict, opt_name,

                                     more_error, more_warning):

        """Check the tree for uncommitted changes and branch synchronization.

        If strict is None and not set in the config files, a warning is issued.

        If strict is True, an error is raised.

        If strict is False, no checks are done and no warning is issued.

        :param strict: True, False or None, searched in branch config if None.

        :param opt_name: strict option name to search in config file.

        :param more_error: Details about how to avoid the check.

        :param more_warning: Details about what is happening.

        """

        if strict is None:

            strict = self.branch.get_config_stack().get(opt_name)

        if strict is not False:

            err_class = None

            if (self.has_changes()):

                err_class = errors.UncommittedChanges

            elif self.last_revision() != self.branch.last_revision():

                # The tree has lost sync with its branch, there is little

                # chance that the user is aware of it but he can still force

                # the action with --no-strict

                err_class = errors.OutOfDateTree

            if err_class is not None:

                if strict is None:

                    err = err_class(self, more=more_warning)

                    # We don't want to interrupt the user if he expressed no

                    # preference about strict.

                    trace.warning('%s', err._format())

                else:

                    err = err_class(self, more=more_error)

                    raise err

    @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 _observed_sha1(self, file_id, path, sha_and_stat):

        """Tell the tree we have observed a paths sha1.

        The intent of this function is to allow trees that have a hashcache to

        update the hashcache during commit. If the observed file is too new

        (based on the stat_value) to be safely hash-cached the tree will ignore

        it.

        The default implementation does nothing.

        :param file_id: The file id

        :param path: The file path

        :param sha_and_stat: The sha 1 and stat result observed.

        :return: None

        """

    @needs_write_lock

    def put_file_bytes_non_atomic(self, file_id, bytes):

        """Update the content of a file in the tree.

        Note that the file is written in-place rather than being

        written to a temporary location and renamed. As a consequence,

        readers can potentially see the file half-written.

        :param file_id: file-id of the file

        :param bytes: the new file contents

        """

        raise NotImplementedError(self.put_file_bytes_non_atomic)

    def set_parent_ids(self, revision_ids, allow_leftmost_as_ghost=False):

        """Set the parents ids of the working tree.

        :param revision_ids: A list of revision_ids.

        """

        raise NotImplementedError(self.set_parent_ids)

    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)

    def smart_add(self, file_list, recurse=True, action=None, save=True):

        """Version file_list, optionally recursing into directories.

        This is designed more towards DWIM for humans than API clarity.

        For the specific behaviour see the help for cmd_add().

        :param file_list: List of zero or more paths.  *NB: these are 

            interpreted relative to the process cwd, not relative to the 

            tree.*  (Add and most other tree methods use tree-relative

            paths.)

        :param action: A reporter to be called with the inventory, parent_ie,

            path and kind of the path being added. It may return a file_id if

            a specific one should be used.

        :param save: Save the inventory after completing the adds. If False

            this provides dry-run functionality by doing the add and not saving

            the inventory.

        :return: A tuple - files_added, ignored_files. files_added is the count

            of added files, and ignored_files is a dict mapping files that were

            ignored to the rule that caused them to be ignored.

        """

        raise NotImplementedError(self.smart_add)

class MutableTreeHooks(hooks.Hooks):

    """A dictionary mapping a hook name to a list of callables for mutabletree

    hooks.

    """

    def __init__(self):

        """Create the default hooks.

        """

        hooks.Hooks.__init__(self, "breezy.mutabletree", "MutableTree.hooks")

        self.add_hook('start_commit',

            "Called before a commit is performed on a tree. The start commit "

            "hook is able to change the tree before the commit takes place. "

            "start_commit is called with the breezy.mutabletree.MutableTree "

            "that the commit is being performed on.", (1, 4))

        self.add_hook('post_commit',

            "Called after a commit is performed on a tree. The hook is "

            "called with a breezy.mutabletree.PostCommitHookParams object. "

            "The mutable tree the commit was performed on is available via "

            "the mutable_tree attribute of that object.", (2, 0))

        self.add_hook('pre_transform',

            "Called before a tree transform on this tree. The hook is called "

            "with the tree that is being transformed and the transform.",

            (2, 5))

        self.add_hook('post_build_tree',

            "Called after a completely new tree is built. The hook is "

            "called with the tree as its only argument.", (2, 5))

        self.add_hook('post_transform',

            "Called after a tree transform has been performed on a tree. "

            "The hook is called with the tree that is being transformed and "

            "the transform.",

            (2, 5))

# install the default hooks into the MutableTree class.

MutableTree.hooks = MutableTreeHooks()

class PostCommitHookParams(object):

    """Parameters for the post_commit hook.

    To access the parameters, use the following attributes:

    * mutable_tree - the MutableTree object

    """

    def __init__(self, mutable_tree):

        """Create the parameters for the post_commit hook."""

        self.mutable_tree = mutable_tree