/brz/remove-bazaar

# Copyright (C) 2005-2011 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

"""Tree classes, representing directory at point in time.

"""

from __future__ import absolute_import

import os

from .lazy_import import lazy_import

lazy_import(globals(), """

import collections

from breezy import (

    conflicts as _mod_conflicts,

    debug,

    delta,

    filters,

    revision as _mod_revision,

    rules,

    trace,

    )

from breezy.i18n import gettext

""")

from . import (

    errors,

    lock,

    osutils,

    )

from .inter import InterObject

from .sixish import (

    viewvalues,

    )

class FileTimestampUnavailable(errors.BzrError):

    _fmt = "The filestamp for %(path)s is not available."

    internal_error = True

    def __init__(self, path):

        self.path = path

class TreeEntry(object):

    """An entry that implements the minimum interface used by commands.

    """

    def __eq__(self, other):

        # yes, this is ugly, TODO: best practice __eq__ style.

        return (isinstance(other, TreeEntry)

                and other.__class__ == self.__class__)

    def kind_character(self):

        return "???"

class TreeDirectory(TreeEntry):

    """See TreeEntry. This is a directory in a working tree."""

    def kind_character(self):

        return "/"

class TreeFile(TreeEntry):

    """See TreeEntry. This is a regular file in a working tree."""

    def kind_character(self):

        return ''

class TreeLink(TreeEntry):

    """See TreeEntry. This is a symlink in a working tree."""

    def kind_character(self):

        return ''

class TreeReference(TreeEntry):

    """See TreeEntry. This is a reference to a nested tree in a working tree."""

    def kind_character(self):

        return '/'

class Tree(object):

    """Abstract file tree.

    There are several subclasses:

    * `WorkingTree` exists as files on disk editable by the user.

    * `RevisionTree` is a tree as recorded at some point in the past.

    Trees can be compared, etc, regardless of whether they are working

    trees or versioned trees.

    """

    def supports_rename_tracking(self):

        """Whether this tree supports rename tracking.

        This defaults to True, but some implementations may want to override

        it.

        """

        return True

    def has_versioned_directories(self):

        """Whether this tree can contain explicitly versioned directories.

        This defaults to True, but some implementations may want to override

        it.

        """

        return True

    def changes_from(self, other, want_unchanged=False, specific_files=None,

        extra_trees=None, require_versioned=False, include_root=False,

        want_unversioned=False):

        """Return a TreeDelta of the changes from other to this tree.

        :param other: A tree to compare with.

        :param specific_files: An optional list of file paths to restrict the

            comparison to. When mapping filenames to ids, all matches in all

            trees (including optional extra_trees) are used, and all children of

            matched directories are included.

        :param want_unchanged: An optional boolean requesting the inclusion of

            unchanged entries in the result.

        :param extra_trees: An optional list of additional trees to use when

            mapping the contents of specific_files (paths) to file_ids.

        :param require_versioned: An optional boolean (defaults to False). When

            supplied and True all the 'specific_files' must be versioned, or

            a PathsNotVersionedError will be thrown.

        :param want_unversioned: Scan for unversioned paths.

        The comparison will be performed by an InterTree object looked up on

        self and other.

        """

        # Martin observes that Tree.changes_from returns a TreeDelta and this

        # may confuse people, because the class name of the returned object is

        # a synonym of the object referenced in the method name.

        return InterTree.get(other, self).compare(

            want_unchanged=want_unchanged,

            specific_files=specific_files,

            extra_trees=extra_trees,

            require_versioned=require_versioned,

            include_root=include_root,

            want_unversioned=want_unversioned,

            )

    def iter_changes(self, from_tree, include_unchanged=False,

                     specific_files=None, pb=None, extra_trees=None,

                     require_versioned=True, want_unversioned=False):

        """See InterTree.iter_changes"""

        intertree = InterTree.get(from_tree, self)

        return intertree.iter_changes(include_unchanged, specific_files, pb,

            extra_trees, require_versioned, want_unversioned=want_unversioned)

    def conflicts(self):

        """Get a list of the conflicts in the tree.

        Each conflict is an instance of breezy.conflicts.Conflict.

        """

        return _mod_conflicts.ConflictList()

    def extras(self):

        """For trees that can have unversioned files, return all such paths."""

        return []

    def get_parent_ids(self):

        """Get the parent ids for this tree.

        :return: a list of parent ids. [] is returned to indicate

        a tree with no parents.

        :raises: BzrError if the parents are not known.

        """

        raise NotImplementedError(self.get_parent_ids)

    def has_filename(self, filename):

        """True if the tree has given filename."""

        raise NotImplementedError(self.has_filename)

    def is_ignored(self, filename):

        """Check whether the filename is ignored by this tree.

        :param filename: The relative filename within the tree.

        :return: True if the filename is ignored.

        """

        return False

    def all_file_ids(self):

        """Iterate through all file ids, including ids for missing files."""

        raise NotImplementedError(self.all_file_ids)

    def all_versioned_paths(self):

        """Iterate through all paths, including paths for missing files."""

        raise NotImplementedError(self.all_versioned_paths)

    def id2path(self, file_id):

        """Return the path for a file id.

        :raises NoSuchId:

        """

        raise NotImplementedError(self.id2path)

    def iter_entries_by_dir(self, specific_files=None):

        """Walk the tree in 'by_dir' order.

        This will yield each entry in the tree as a (path, entry) tuple.

        The order that they are yielded is:

        Directories are walked in a depth-first lexicographical order,

        however, whenever a directory is reached, all of its direct child

        nodes are yielded in  lexicographical order before yielding the

        grandchildren.

        For example, in the tree::

           a/

             b/

               c

             d/

               e

           f/

             g

        The yield order (ignoring root) would be::

          a, f, a/b, a/d, a/b/c, a/d/e, f/g

        """

        raise NotImplementedError(self.iter_entries_by_dir)

    def iter_child_entries(self, path, file_id=None):

        """Iterate over the children of a directory or tree reference.

        :param path: Path of the directory

        :param file_id: Optional file id of the directory/tree-reference

        :raise NoSuchId: When the file_id does not exist

        :return: Iterator over entries in the directory

        """

        raise NotImplementedError(self.iter_child_entries)

    def list_files(self, include_root=False, from_dir=None, recursive=True):

        """List all files in this tree.

        :param include_root: Whether to include the entry for the tree root

        :param from_dir: Directory under which to list files

        :param recursive: Whether to list files recursively

        :return: iterator over tuples of (path, versioned, kind, file_id,

            inventory entry)

        """

        raise NotImplementedError(self.list_files)

    def iter_references(self):

        if self.supports_tree_reference():

            for path, entry in self.iter_entries_by_dir():

                if entry.kind == 'tree-reference':

                    yield path, entry.file_id

    def kind(self, path, file_id=None):

        raise NotImplementedError("Tree subclass %s must implement kind"

            % self.__class__.__name__)

    def stored_kind(self, path, file_id=None):

        """File kind stored for this file_id.

        May not match kind on disk for working trees.  Always available

        for versioned files, even when the file itself is missing.

        """

        return self.kind(path, file_id)

    def path_content_summary(self, path):

        """Get a summary of the information about path.

        All the attributes returned are for the canonical form, not the

        convenient form (if content filters are in use.)

        :param path: A relative path within the tree.

        :return: A tuple containing kind, size, exec, sha1-or-link.

            Kind is always present (see tree.kind()).

            size is present if kind is file and the size of the 

                canonical form can be cheaply determined, None otherwise.

            exec is None unless kind is file and the platform supports the 'x'

                bit.

            sha1-or-link is the link target if kind is symlink, or the sha1 if

                it can be obtained without reading the file.

        """

        raise NotImplementedError(self.path_content_summary)

    def get_reference_revision(self, path, file_id=None):

        raise NotImplementedError("Tree subclass %s must implement "

                                  "get_reference_revision"

            % self.__class__.__name__)

    def _comparison_data(self, entry, path):

        """Return a tuple of kind, executable, stat_value for a file.

        entry may be None if there is no inventory entry for the file, but

        path must always be supplied.

        kind is None if there is no file present (even if an inventory id is

        present).  executable is False for non-file entries.

        """

        raise NotImplementedError(self._comparison_data)

    def get_file(self, path, file_id=None):

        """Return a file object for the file file_id in the tree.

        If both file_id and path are defined, it is implementation defined as

        to which one is used.

        """

        raise NotImplementedError(self.get_file)

    def get_file_with_stat(self, path, file_id=None):

        """Get a file handle and stat object for file_id.

        The default implementation returns (self.get_file, None) for backwards

        compatibility.

        :param path: The path of the file.

        :param file_id: The file id to read, if it is known.

        :return: A tuple (file_handle, stat_value_or_None). If the tree has

            no stat facility, or need for a stat cache feedback during commit,

            it may return None for the second element of the tuple.

        """

        return (self.get_file(path, file_id), None)

    def get_file_text(self, path, file_id=None):

        """Return the byte content of a file.

        :param path: The path of the file.

        :param file_id: The file_id of the file.

        If both file_id and path are supplied, an implementation may use

        either one.

        :returns: A single byte string for the whole file.

        """

        my_file = self.get_file(path, file_id)

        try:

            return my_file.read()

        finally:

            my_file.close()

    def get_file_lines(self, path, file_id=None):

        """Return the content of a file, as lines.

        :param path: The path of the file.

        :param file_id: The file_id of the file.

        If both file_id and path are supplied, an implementation may use

        either one.

        """

        return osutils.split_lines(self.get_file_text(path, file_id))

    def get_file_verifier(self, path, file_id=None, stat_value=None):

        """Return a verifier for a file.

        The default implementation returns a sha1.

        :param file_id: The handle for this file.

        :param path: The path that this file can be found at.

            These must point to the same object.

        :param stat_value: Optional stat value for the object

        :return: Tuple with verifier name and verifier data

        """

        return ("SHA1", self.get_file_sha1(path, file_id,

            stat_value=stat_value))

    def get_file_sha1(self, path, file_id=None, stat_value=None):

        """Return the SHA1 file for a file.

        :note: callers should use get_file_verifier instead

            where possible, as the underlying repository implementation may

            have quicker access to a non-sha1 verifier.

        :param path: The path that this file can be found at.

        :param file_id: The handle for this file.

            These must point to the same object.

        :param stat_value: Optional stat value for the object

        """

        raise NotImplementedError(self.get_file_sha1)

    def get_file_mtime(self, path, file_id=None):

        """Return the modification time for a file.

        :param path: The path that this file can be found at.

        :param file_id: The handle for this file.

            These must point to the same object.

        """

        raise NotImplementedError(self.get_file_mtime)

    def get_file_size(self, path, file_id=None):

        """Return the size of a file in bytes.

        This applies only to regular files.  If invoked on directories or

        symlinks, it will return None.

        :param file_id: The file-id of the file

        """

        raise NotImplementedError(self.get_file_size)

    def is_executable(self, path, file_id=None):

        """Check if a file is executable.

        :param path: The path that this file can be found at.

        :param file_id: The handle for this file.

            These must point to the same object.

        """

        raise NotImplementedError(self.is_executable)

    def iter_files_bytes(self, desired_files):

        """Iterate through file contents.

        Files will not necessarily be returned in the order they occur in

        desired_files.  No specific order is guaranteed.

        Yields pairs of identifier, bytes_iterator.  identifier is an opaque

        value supplied by the caller as part of desired_files.  It should

        uniquely identify the file version in the caller's context.  (Examples:

        an index number or a TreeTransform trans_id.)

        bytes_iterator is an iterable of bytestrings for the file.  The

        kind of iterable and length of the bytestrings are unspecified, but for

        this implementation, it is a tuple containing a single bytestring with

        the complete text of the file.

        :param desired_files: a list of (path, identifier) pairs

        """

        for path, identifier in desired_files:

            # We wrap the string in a tuple so that we can return an iterable

            # of bytestrings.  (Technically, a bytestring is also an iterable

            # of bytestrings, but iterating through each character is not

            # performant.)

            cur_file = (self.get_file_text(path),)

            yield identifier, cur_file

    def get_symlink_target(self, path, file_id=None):

        """Get the target for a given file_id.

        It is assumed that the caller already knows that file_id is referencing

        a symlink.

        :param file_id: Handle for the symlink entry.

        :param path: The path of the file.

        If both file_id and path are supplied, an implementation may use

        either one.

        :return: The path the symlink points to.

        """

        raise NotImplementedError(self.get_symlink_target)

    def get_root_id(self):

        """Return the file_id for the root of this tree."""

        raise NotImplementedError(self.get_root_id)

    def annotate_iter(self, path, file_id=None,

                      default_revision=_mod_revision.CURRENT_REVISION):

        """Return an iterator of revision_id, line tuples.

        For working trees (and mutable trees in general), the special

        revision_id 'current:' will be used for lines that are new in this

        tree, e.g. uncommitted changes.

        :param file_id: The file to produce an annotated version from

        :param default_revision: For lines that don't match a basis, mark them

            with this revision id. Not all implementations will make use of

            this value.

        """

        raise NotImplementedError(self.annotate_iter)

    def _iter_parent_trees(self):

        """Iterate through parent trees, defaulting to Tree.revision_tree."""

        for revision_id in self.get_parent_ids():

            try:

                yield self.revision_tree(revision_id)

            except errors.NoSuchRevisionInTree:

                yield self.repository.revision_tree(revision_id)

    def path2id(self, path):

        """Return the id for path in this tree."""

        raise NotImplementedError(self.path2id)

    def is_versioned(self, path):

        """Check whether path is versioned.

        :param path: Path to check

        :return: boolean

        """

        return self.path2id(path) is not None

    def find_related_paths_across_trees(self, paths, trees=[],

            require_versioned=True):

        """Find related paths in tree corresponding to specified filenames in any

        of `lookup_trees`.

        All matches in all trees will be used, and all children of matched

        directories will be used.

        :param paths: The filenames to find related paths for (if None, returns

            None)

        :param trees: The trees to find file_ids within

        :param require_versioned: if true, all specified filenames must occur in

            at least one tree.

        :return: a set of paths for the specified filenames and their children

            in `tree`

        """

        raise NotImplementedError(self.find_related_paths_across_trees)

    def lock_read(self):

        """Lock this tree for multiple read only operations.

        :return: A breezy.lock.LogicalLockResult.

        """

        return lock.LogicalLockResult(self.unlock)

    def revision_tree(self, revision_id):

        """Obtain a revision tree for the revision revision_id.

        The intention of this method is to allow access to possibly cached

        tree data. Implementors of this method should raise NoSuchRevision if

        the tree is not locally available, even if they could obtain the

        tree via a repository or some other means. Callers are responsible

        for finding the ultimate source for a revision tree.

        :param revision_id: The revision_id of the requested tree.

        :return: A Tree.

        :raises: NoSuchRevision if the tree cannot be obtained.

        """

        raise errors.NoSuchRevisionInTree(self, revision_id)

    def unknowns(self):

        """What files are present in this tree and unknown.

        :return: an iterator over the unknown files.

        """

        return iter([])

    def unlock(self):

        pass

    def filter_unversioned_files(self, paths):

        """Filter out paths that are versioned.

        :return: set of paths.

        """

        raise NotImplementedError(self.filter_unversioned_files)

    def walkdirs(self, prefix=""):

        """Walk the contents of this tree from path down.

        This yields all the data about the contents of a directory at a time.

        After each directory has been yielded, if the caller has mutated the

        list to exclude some directories, they are then not descended into.

        The data yielded is of the form:

        ((directory-relpath, directory-path-from-root, directory-fileid),

        [(relpath, basename, kind, lstat, path_from_tree_root, file_id,

          versioned_kind), ...]),

         - directory-relpath is the containing dirs relpath from prefix

         - directory-path-from-root is the containing dirs path from /

         - directory-fileid is the id of the directory if it is versioned.

         - relpath is the relative path within the subtree being walked.

         - basename is the basename

         - kind is the kind of the file now. If unknonwn then the file is not

           present within the tree - but it may be recorded as versioned. See

           versioned_kind.

         - lstat is the stat data *if* the file was statted.

         - path_from_tree_root is the path from the root of the tree.

         - file_id is the file_id if the entry is versioned.

         - versioned_kind is the kind of the file as last recorded in the

           versioning system. If 'unknown' the file is not versioned.

        One of 'kind' and 'versioned_kind' must not be 'unknown'.

        :param prefix: Start walking from prefix within the tree rather than

        at the root. This allows one to walk a subtree but get paths that are

        relative to a tree rooted higher up.

        :return: an iterator over the directory data.

        """

        raise NotImplementedError(self.walkdirs)

    def supports_content_filtering(self):

        return False

    def _content_filter_stack(self, path=None):

        """The stack of content filters for a path if filtering is supported.

        Readers will be applied in first-to-last order.

        Writers will be applied in last-to-first order.

        Either the path or the file-id needs to be provided.

        :param path: path relative to the root of the tree

            or None if unknown

        :return: the list of filters - [] if there are none

        """

        filter_pref_names = filters._get_registered_names()

        if len(filter_pref_names) == 0:

            return []

        prefs = next(self.iter_search_rules([path], filter_pref_names))

        stk = filters._get_filter_stack_for(prefs)

        if 'filters' in debug.debug_flags:

            trace.note(gettext("*** {0} content-filter: {1} => {2!r}").format(path, prefs, stk))

        return stk

    def _content_filter_stack_provider(self):

        """A function that returns a stack of ContentFilters.

        The function takes a path (relative to the top of the tree) and a

        file-id as parameters.

        :return: None if content filtering is not supported by this tree.

        """

        if self.supports_content_filtering():

            return lambda path, file_id: \

                    self._content_filter_stack(path)

        else:

            return None

    def iter_search_rules(self, path_names, pref_names=None,

        _default_searcher=None):

        """Find the preferences for filenames in a tree.

        :param path_names: an iterable of paths to find attributes for.

          Paths are given relative to the root of the tree.

        :param pref_names: the list of preferences to lookup - None for all

        :param _default_searcher: private parameter to assist testing - don't use

        :return: an iterator of tuple sequences, one per path-name.

          See _RulesSearcher.get_items for details on the tuple sequence.

        """

        if _default_searcher is None:

            _default_searcher = rules._per_user_searcher

        searcher = self._get_rules_searcher(_default_searcher)

        if searcher is not None:

            if pref_names is not None:

                for path in path_names:

                    yield searcher.get_selected_items(path, pref_names)

            else:

                for path in path_names:

                    yield searcher.get_items(path)

    def _get_rules_searcher(self, default_searcher):

        """Get the RulesSearcher for this tree given the default one."""

        searcher = default_searcher

        return searcher

    @classmethod

    def versionable_kind(cls, kind):

        """Check if this tree support versioning a specific file kind."""

        return (kind in ('file', 'directory', 'symlink', 'tree-reference'))

class InterTree(InterObject):

    """This class represents operations taking place between two Trees.

    Its instances have methods like 'compare' and contain references to the

    source and target trees these operations are to be carried out on.

    Clients of breezy should not need to use InterTree directly, rather they

    should use the convenience methods on Tree such as 'Tree.compare()' which

    will pass through to InterTree as appropriate.

    """

    # Formats that will be used to test this InterTree. If both are

    # None, this InterTree will not be tested (e.g. because a complex

    # setup is required)

    _matching_from_tree_format = None

    _matching_to_tree_format = None

    _optimisers = []

    @classmethod

    def is_compatible(kls, source, target):

        # The default implementation is naive and uses the public API, so

        # it works for all trees.

        return True

    def _changes_from_entries(self, source_entry, target_entry, source_path,

                              target_path):

        """Generate a iter_changes tuple between source_entry and target_entry.

        :param source_entry: An inventory entry from self.source, or None.

        :param target_entry: An inventory entry from self.target, or None.

        :param source_path: The path of source_entry.

        :param target_path: The path of target_entry.

        :return: A tuple, item 0 of which is an iter_changes result tuple, and

            item 1 is True if there are any changes in the result tuple.

        """

        if source_entry is None:

            if target_entry is None:

                return None

            file_id = target_entry.file_id

        else:

            file_id = source_entry.file_id

        if source_entry is not None:

            source_versioned = True

            source_name = source_entry.name

            source_parent = source_entry.parent_id

            source_kind, source_executable, source_stat = \

                self.source._comparison_data(source_entry, source_path)

        else:

            source_versioned = False

            source_name = None

            source_parent = None

            source_kind = None

            source_executable = None

        if target_entry is not None:

            target_versioned = True

            target_name = target_entry.name

            target_parent = target_entry.parent_id

            target_kind, target_executable, target_stat = \

                self.target._comparison_data(target_entry, target_path)

        else:

            target_versioned = False

            target_name = None

            target_parent = None

            target_kind = None

            target_executable = None

        versioned = (source_versioned, target_versioned)

        kind = (source_kind, target_kind)

        changed_content = False

        if source_kind != target_kind:

            changed_content = True

        elif source_kind == 'file':

            if not self.file_content_matches(

                    source_path, target_path,

                    file_id, file_id, source_stat, target_stat):

                changed_content = True

        elif source_kind == 'symlink':

            if (self.source.get_symlink_target(source_path, file_id) !=

                self.target.get_symlink_target(target_path, file_id)):

                changed_content = True

        elif source_kind == 'tree-reference':

            if (self.source.get_reference_revision(source_path, file_id)

                != self.target.get_reference_revision(target_path, file_id)):

                    changed_content = True

        parent = (source_parent, target_parent)

        name = (source_name, target_name)

        executable = (source_executable, target_executable)

        if (changed_content is not False or versioned[0] != versioned[1]

            or parent[0] != parent[1] or name[0] != name[1] or

            executable[0] != executable[1]):

            changes = True

        else: