/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

from .lazy_import import lazy_import

lazy_import(globals(), """

import operator

import os

import re

from breezy import (

    add,

    controldir,

    errors,

    hooks,

    inventory as _mod_inventory,

    osutils,

    revisiontree,

    trace,

    transport as _mod_transport,

    tree,

    )

""")

from .decorators import needs_read_lock, needs_write_lock

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, basestring):

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

            # deprecated.

            if not (ids is None or isinstance(ids, basestring)):

                raise AssertionError()

            if not (kinds is None or isinstance(kinds, basestring)):

                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.pop('author', 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 MutableInventoryTree(MutableTree, tree.InventoryTree):

    @needs_tree_write_lock

    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.

        """

        self.flush()

        inv = self.root_inventory

        inv.apply_delta(changes)

        self._write_inventory(inv)

    def _fix_case_of_inventory_path(self, path):

        """If our tree isn't case sensitive, return the canonical path"""

        if not self.case_sensitive:

            path = self.get_canonical_inventory_path(path)

        return path

    @needs_tree_write_lock

    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.

        """

        # Not all mutable trees can have conflicts

        if getattr(self, 'conflicts', None) is not None:

            # Collect all related files without checking whether they exist or

            # are versioned. It's cheaper to do that once for all conflicts

            # than trying to find the relevant conflict for each added file.

            conflicts_related = set()

            for c in self.conflicts():

                conflicts_related.update(c.associated_filenames())

        else:

            conflicts_related = None

        adder = _SmartAddHelper(self, action, conflicts_related)

        adder.add(file_list, recurse=recurse)

        if save:

            invdelta = adder.get_inventory_delta()

            self.apply_inventory_delta(invdelta)

        return adder.added, adder.ignored

    def update_basis_by_delta(self, new_revid, delta):

        """Update the parents of this tree after a commit.

        This gives the tree one parent, with revision id new_revid. The

        inventory delta is applied to the current basis tree to generate the

        inventory for the parent new_revid, and all other parent trees are

        discarded.

        All the changes in the delta should be changes synchronising the basis

        tree with some or all of the working tree, with a change to a directory

        requiring that its contents have been recursively included. That is,

        this is not a general purpose tree modification routine, but a helper

        for commit which is not required to handle situations that do not arise

        outside of commit.

        See the inventory developers documentation for the theory behind

        inventory deltas.

        :param new_revid: The new revision id for the trees parent.

        :param delta: An inventory delta (see apply_inventory_delta) describing

            the changes from the current left most parent revision to new_revid.

        """

        # if the tree is updated by a pull to the branch, as happens in

        # WorkingTree2, when there was no separation between branch and tree,

        # then just clear merges, efficiency is not a concern for now as this

        # is legacy environments only, and they are slow regardless.

        if self.last_revision() == new_revid:

            self.set_parent_ids([new_revid])

            return

        # generic implementation based on Inventory manipulation. See

        # WorkingTree classes for optimised versions for specific format trees.

        basis = self.basis_tree()

        basis.lock_read()

        # TODO: Consider re-evaluating the need for this with CHKInventory

        # we don't strictly need to mutate an inventory for this

        # it only makes sense when apply_delta is cheaper than get_inventory()

        inventory = _mod_inventory.mutable_inventory_from_tree(basis)

        basis.unlock()

        inventory.apply_delta(delta)

        rev_tree = revisiontree.InventoryRevisionTree(self.branch.repository,

                                             inventory, new_revid)

        self.set_parent_trees([(new_revid, rev_tree)])

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

class _SmartAddHelper(object):

    """Helper for MutableTree.smart_add."""

    def get_inventory_delta(self):

        return self._invdelta.values()

    def _get_ie(self, inv_path):

        """Retrieve the most up to date inventory entry for a path.

        :param inv_path: Normalized inventory path

        :return: Inventory entry (with possibly invalid .children for

            directories)

        """

        entry = self._invdelta.get(inv_path)

        if entry is not None:

            return entry[3]

        # Find a 'best fit' match if the filesystem is case-insensitive

        inv_path = self.tree._fix_case_of_inventory_path(inv_path)

        file_id = self.tree.path2id(inv_path)

        if file_id is not None:

            return self.tree.iter_entries_by_dir([file_id]).next()[1]

        return None

    def _convert_to_directory(self, this_ie, inv_path):

        """Convert an entry to a directory.

        :param this_ie: Inventory entry

        :param inv_path: Normalized path for the inventory entry

        :return: The new inventory entry

        """

        # Same as in _add_one below, if the inventory doesn't

        # think this is a directory, update the inventory

        this_ie = _mod_inventory.InventoryDirectory(

            this_ie.file_id, this_ie.name, this_ie.parent_id)

        self._invdelta[inv_path] = (inv_path, inv_path, this_ie.file_id,

            this_ie)

        return this_ie

    def _add_one_and_parent(self, parent_ie, path, kind, inv_path):

        """Add a new entry to the inventory and automatically add unversioned parents.

        :param parent_ie: Parent inventory entry if known, or None.  If

            None, the parent is looked up by name and used if present, otherwise it

            is recursively added.

        :param path: 

        :param kind: Kind of new entry (file, directory, etc)

        :param inv_path:

        :return: Inventory entry for path and a list of paths which have been added.

        """

        # Nothing to do if path is already versioned.

        # This is safe from infinite recursion because the tree root is

        # always versioned.

        inv_dirname = osutils.dirname(inv_path)

        dirname, basename = osutils.split(path)

        if parent_ie is None:

            # slower but does not need parent_ie

            this_ie = self._get_ie(inv_path)

            if this_ie is not None:

                return this_ie

            # its really not there : add the parent

            # note that the dirname use leads to some extra str copying etc but as

            # there are a limited number of dirs we can be nested under, it should

            # generally find it very fast and not recurse after that.

            parent_ie = self._add_one_and_parent(None,

                dirname, 'directory', 

                inv_dirname)

        # if the parent exists, but isn't a directory, we have to do the

        # kind change now -- really the inventory shouldn't pretend to know

        # the kind of wt files, but it does.

        if parent_ie.kind != 'directory':

            # nb: this relies on someone else checking that the path we're using

            # doesn't contain symlinks.

            parent_ie = self._convert_to_directory(parent_ie, inv_dirname)

        file_id = self.action(self.tree, parent_ie, path, kind)

        entry = _mod_inventory.make_entry(kind, basename, parent_ie.file_id,

            file_id=file_id)

        self._invdelta[inv_path] = (None, inv_path, entry.file_id, entry)

        self.added.append(inv_path)

        return entry

    def _gather_dirs_to_add(self, user_dirs):

        # only walk the minimal parents needed: we have user_dirs to override

        # ignores.

        prev_dir = None

        is_inside = osutils.is_inside_or_parent_of_any

        for path, (inv_path, this_ie) in sorted(

                user_dirs.iteritems(), key=operator.itemgetter(0)):

            if (prev_dir is None or not is_inside([prev_dir], path)):

                yield (path, inv_path, this_ie, None)

            prev_dir = path

    def __init__(self, tree, action, conflicts_related=None):

        self.tree = tree

        if action is None:

            self.action = add.AddAction()

        else:

            self.action = action

        self._invdelta = {}

        self.added = []

        self.ignored = {}

        if conflicts_related is None:

            self.conflicts_related = frozenset()

        else:

            self.conflicts_related = conflicts_related

    def add(self, file_list, recurse=True):

        from breezy.inventory import InventoryEntry

        if not file_list:

            # no paths supplied: add the entire tree.

            # FIXME: this assumes we are running in a working tree subdir :-/

            # -- vila 20100208

            file_list = [u'.']

        # expand any symlinks in the directory part, while leaving the

        # filename alone

        # only expanding if symlinks are supported avoids windows path bugs

        if osutils.has_symlinks():

            file_list = list(map(osutils.normalizepath, file_list))

        user_dirs = {}

        # validate user file paths and convert all paths to tree

        # relative : it's cheaper to make a tree relative path an abspath

        # than to convert an abspath to tree relative, and it's cheaper to

        # perform the canonicalization in bulk.

        for filepath in osutils.canonical_relpaths(self.tree.basedir, file_list):

            # validate user parameters. Our recursive code avoids adding new

            # files that need such validation

            if self.tree.is_control_filename(filepath):

                raise errors.ForbiddenControlFileError(filename=filepath)

            abspath = self.tree.abspath(filepath)

            kind = osutils.file_kind(abspath)

            # ensure the named path is added, so that ignore rules in the later

            # directory walk dont skip it.

            # we dont have a parent ie known yet.: use the relatively slower

            # inventory probing method

            inv_path, _ = osutils.normalized_filename(filepath)

            this_ie = self._get_ie(inv_path)

            if this_ie is None:

                this_ie = self._add_one_and_parent(None, filepath, kind, inv_path)

            if kind == 'directory':

                # schedule the dir for scanning

                user_dirs[filepath] = (inv_path, this_ie)

        if not recurse:

            # no need to walk any directories at all.

            return

        things_to_add = list(self._gather_dirs_to_add(user_dirs))

        illegalpath_re = re.compile(r'[\r\n]')

        for directory, inv_path, this_ie, parent_ie in things_to_add:

            # directory is tree-relative

            abspath = self.tree.abspath(directory)

            # get the contents of this directory.

            # find the kind of the path being added, and save stat_value

            # for reuse

            stat_value = None

            if this_ie is None:

                stat_value = osutils.file_stat(abspath)

                kind = osutils.file_kind_from_stat_mode(stat_value.st_mode)

            else:

                kind = this_ie.kind

            # allow AddAction to skip this file

            if self.action.skip_file(self.tree,  abspath,  kind,  stat_value):

                continue

            if not InventoryEntry.versionable_kind(kind):

                trace.warning("skipping %s (can't add file of kind '%s')",

                              abspath, kind)

                continue

            if illegalpath_re.search(directory):