~bzr-pqm/bzr/bzr.dev

# 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

"""WorkingTree object and friends.

A WorkingTree represents the editable working copy of a branch.

Operations which represent the WorkingTree are also done here,

such as renaming or adding files.  The WorkingTree has an inventory

which is updated by these operations.  A commit produces a

new revision based on the workingtree and its inventory.

At the moment every WorkingTree has its own branch.  Remote

WorkingTrees aren't supported.

To get a WorkingTree, call bzrdir.open_workingtree() or

WorkingTree.open(dir).

"""

from __future__ import absolute_import

from cStringIO import StringIO

import os

import sys

from bzrlib.lazy_import import lazy_import

lazy_import(globals(), """

from bisect import bisect_left

import collections

import errno

import itertools

import operator

import stat

import re

from bzrlib import (

    branch,

    conflicts as _mod_conflicts,

    controldir,

    errors,

    filters as _mod_filters,

    generate_ids,

    globbing,

    graph as _mod_graph,

    ignores,

    inventory,

    merge,

    revision as _mod_revision,

    revisiontree,

    rio as _mod_rio,

    transform,

    transport,

    ui,

    views,

    xml5,

    xml7,

    )

""")

# Explicitly import bzrlib.bzrdir so that the BzrProber

# is guaranteed to be registered.

from bzrlib import (

    bzrdir,

    symbol_versioning,

    )

from bzrlib.decorators import needs_read_lock, needs_write_lock

from bzrlib.i18n import gettext

from bzrlib.lock import LogicalLockResult

import bzrlib.mutabletree

from bzrlib.mutabletree import needs_tree_write_lock

from bzrlib import osutils

from bzrlib.osutils import (

    file_kind,

    isdir,

    normpath,

    pathjoin,

    realpath,

    safe_unicode,

    splitpath,

    )

from bzrlib.trace import mutter, note

from bzrlib.revision import CURRENT_REVISION

from bzrlib.symbol_versioning import (

    deprecated_passed,

    DEPRECATED_PARAMETER,

    )

MERGE_MODIFIED_HEADER_1 = "BZR merge-modified list format 1"

# TODO: Modifying the conflict objects or their type is currently nearly

# impossible as there is no clear relationship between the working tree format

# and the conflict list file format.

CONFLICT_HEADER_1 = "BZR conflict list format 1"

ERROR_PATH_NOT_FOUND = 3    # WindowsError errno code, equivalent to ENOENT

class TreeEntry(object):

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

    This needs further inspection, it may be better to have

    InventoryEntries without ids - though that seems wrong. For now,

    this is a parallel hierarchy to InventoryEntry, and needs to become

    one of several things: decorates to that hierarchy, children of, or

    parents of it.

    Another note is that these objects are currently only used when there is

    no InventoryEntry available - i.e. for unversioned objects.

    Perhaps they should be UnversionedEntry et al. ? - RBC 20051003

    """

    def __eq__(self, other):

        # yes, this us 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 __eq__(self, other):

        return (isinstance(other, TreeDirectory)

                and other.__class__ == self.__class__)

    def kind_character(self):

        return "/"

class TreeFile(TreeEntry):

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

    def __eq__(self, other):

        return (isinstance(other, TreeFile)

                and other.__class__ == self.__class__)

    def kind_character(self):

        return ''

class TreeLink(TreeEntry):

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

    def __eq__(self, other):

        return (isinstance(other, TreeLink)

                and other.__class__ == self.__class__)

    def kind_character(self):

        return ''

class WorkingTree(bzrlib.mutabletree.MutableTree,

    controldir.ControlComponent):

    """Working copy tree.

    :ivar basedir: The root of the tree on disk. This is a unicode path object

        (as opposed to a URL).

    """

    # override this to set the strategy for storing views

    def _make_views(self):

        return views.DisabledViews(self)

    def __init__(self, basedir='.',

                 branch=DEPRECATED_PARAMETER,

                 _internal=False,

                 _transport=None,

                 _format=None,

                 _bzrdir=None):

        """Construct a WorkingTree instance. This is not a public API.

        :param branch: A branch to override probing for the branch.

        """

        self._format = _format

        self.bzrdir = _bzrdir

        if not _internal:

            raise errors.BzrError("Please use bzrdir.open_workingtree or "

                "WorkingTree.open() to obtain a WorkingTree.")

        basedir = safe_unicode(basedir)

        mutter("opening working tree %r", basedir)

        if deprecated_passed(branch):

            self._branch = branch

        else:

            self._branch = self.bzrdir.open_branch()

        self.basedir = realpath(basedir)

        self._transport = _transport

        self._rules_searcher = None

        self.views = self._make_views()

    @property

    def user_transport(self):

        return self.bzrdir.user_transport

    @property

    def control_transport(self):

        return self._transport

    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.

        """

        return self.bzrdir.is_control_filename(filename)

    branch = property(

        fget=lambda self: self._branch,

        doc="""The branch this WorkingTree is connected to.

            This cannot be set - it is reflective of the actual disk structure

            the working tree has been constructed from.

            """)

    def has_versioned_directories(self):

        """See `Tree.has_versioned_directories`."""

        return self._format.supports_versioned_directories

    def _supports_executable(self):

        if sys.platform == 'win32':

            return False

        # FIXME: Ideally this should check the file system

        return True

    def break_lock(self):

        """Break a lock if one is present from another instance.

        Uses the ui factory to ask for confirmation if the lock may be from

        an active process.

        This will probe the repository for its lock as well.

        """

        raise NotImplementedError(self.break_lock)

    def requires_rich_root(self):

        return self._format.requires_rich_root

    def supports_tree_reference(self):

        return False

    def supports_content_filtering(self):

        return self._format.supports_content_filtering()

    def supports_views(self):

        return self.views.supports_views()

    @staticmethod

    def open(path=None, _unsupported=False):

        """Open an existing working tree at path.

        """

        if path is None:

            path = osutils.getcwd()

        control = controldir.ControlDir.open(path, _unsupported=_unsupported)

        return control.open_workingtree(unsupported=_unsupported)

    @staticmethod

    def open_containing(path=None):

        """Open an existing working tree which has its root about path.

        This probes for a working tree at path and searches upwards from there.

        Basically we keep looking up until we find the control directory or

        run into /.  If there isn't one, raises NotBranchError.

        TODO: give this a new exception.

        If there is one, it is returned, along with the unused portion of path.

        :return: The WorkingTree that contains 'path', and the rest of path

        """

        if path is None:

            path = osutils.getcwd()

        control, relpath = controldir.ControlDir.open_containing(path)

        return control.open_workingtree(), relpath

    @staticmethod

    def open_containing_paths(file_list, default_directory=None,

                              canonicalize=True, apply_view=True):

        """Open the WorkingTree that contains a set of paths.

        Fail if the paths given are not all in a single tree.

        This is used for the many command-line interfaces that take a list of

        any number of files and that require they all be in the same tree.

        """

        if default_directory is None:

            default_directory = u'.'

        # recommended replacement for builtins.internal_tree_files

        if file_list is None or len(file_list) == 0:

            tree = WorkingTree.open_containing(default_directory)[0]

            # XXX: doesn't really belong here, and seems to have the strange

            # side effect of making it return a bunch of files, not the whole

            # tree -- mbp 20100716

            if tree.supports_views() and apply_view:

                view_files = tree.views.lookup_view()

                if view_files:

                    file_list = view_files

                    view_str = views.view_display_str(view_files)

                    note(gettext("Ignoring files outside view. View is %s") % view_str)

            return tree, file_list

        if default_directory == u'.':

            seed = file_list[0]

        else:

            seed = default_directory

            file_list = [osutils.pathjoin(default_directory, f)

                         for f in file_list]

        tree = WorkingTree.open_containing(seed)[0]

        return tree, tree.safe_relpath_files(file_list, canonicalize,

                                             apply_view=apply_view)

    def safe_relpath_files(self, file_list, canonicalize=True, apply_view=True):

        """Convert file_list into a list of relpaths in tree.

        :param self: A tree to operate on.

        :param file_list: A list of user provided paths or None.

        :param apply_view: if True and a view is set, apply it or check that

            specified files are within it

        :return: A list of relative paths.

        :raises errors.PathNotChild: When a provided path is in a different self

            than self.

        """

        if file_list is None:

            return None

        if self.supports_views() and apply_view:

            view_files = self.views.lookup_view()

        else:

            view_files = []

        new_list = []

        # self.relpath exists as a "thunk" to osutils, but canonical_relpath

        # doesn't - fix that up here before we enter the loop.

        if canonicalize:

            fixer = lambda p: osutils.canonical_relpath(self.basedir, p)

        else:

            fixer = self.relpath

        for filename in file_list:

            relpath = fixer(osutils.dereference_path(filename))

            if view_files and not osutils.is_inside_any(view_files, relpath):

                raise errors.FileOutsideView(filename, view_files)

            new_list.append(relpath)

        return new_list

    @staticmethod

    def open_downlevel(path=None):

        """Open an unsupported working tree.

        Only intended for advanced situations like upgrading part of a bzrdir.

        """

        return WorkingTree.open(path, _unsupported=True)

    @staticmethod

    def find_trees(location):

        def list_current(transport):

            return [d for d in transport.list_dir('') if d != '.bzr']

        def evaluate(bzrdir):

            try:

                tree = bzrdir.open_workingtree()

            except errors.NoWorkingTree:

                return True, None

            else:

                return True, tree

        t = transport.get_transport(location)

        iterator = controldir.ControlDir.find_bzrdirs(t, evaluate=evaluate,

                                              list_current=list_current)

        return [tr for tr in iterator if tr is not None]

    def all_file_ids(self):

        """See Tree.iter_all_file_ids"""

        raise NotImplementedError(self.all_file_ids)

    def __repr__(self):

        return "<%s of %s>" % (self.__class__.__name__,

                               getattr(self, 'basedir', None))

    def abspath(self, filename):

        return pathjoin(self.basedir, filename)

    def basis_tree(self):

        """Return RevisionTree for the current last revision.

        If the left most parent is a ghost then the returned tree will be an

        empty tree - one obtained by calling

        repository.revision_tree(NULL_REVISION).

        """

        try:

            revision_id = self.get_parent_ids()[0]

        except IndexError:

            # no parents, return an empty revision tree.

            # in the future this should return the tree for

            # 'empty:' - the implicit root empty tree.

            return self.branch.repository.revision_tree(

                       _mod_revision.NULL_REVISION)

        try:

            return self.revision_tree(revision_id)

        except errors.NoSuchRevision:

            pass

        # No cached copy available, retrieve from the repository.

        # FIXME? RBC 20060403 should we cache the inventory locally

        # at this point ?

        try:

            return self.branch.repository.revision_tree(revision_id)

        except (errors.RevisionNotPresent, errors.NoSuchRevision):

            # the basis tree *may* be a ghost or a low level error may have

            # occurred. If the revision is present, its a problem, if its not

            # its a ghost.

            if self.branch.repository.has_revision(revision_id):

                raise

            # the basis tree is a ghost so return an empty tree.

            return self.branch.repository.revision_tree(

                       _mod_revision.NULL_REVISION)

    def _cleanup(self):

        self._flush_ignore_list_cache()

    def relpath(self, path):

        """Return the local path portion from a given path.

        The path may be absolute or relative. If its a relative path it is

        interpreted relative to the python current working directory.

        """

        return osutils.relpath(self.basedir, path)

    def has_filename(self, filename):

        return osutils.lexists(self.abspath(filename))

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

        return self.get_file_with_stat(file_id, path, filtered=filtered)[0]

    def get_file_with_stat(self, file_id, path=None, filtered=True,

                           _fstat=osutils.fstat):

        """See Tree.get_file_with_stat."""

        if path is None:

            path = self.id2path(file_id)

        file_obj = self.get_file_byname(path, filtered=False)

        stat_value = _fstat(file_obj.fileno())

        if filtered and self.supports_content_filtering():

            filters = self._content_filter_stack(path)

            file_obj = _mod_filters.filtered_input_file(file_obj, filters)

        return (file_obj, stat_value)

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

        my_file = self.get_file(file_id, path=path, filtered=filtered)

        try:

            return my_file.read()

        finally:

            my_file.close()

    def get_file_byname(self, filename, filtered=True):

        path = self.abspath(filename)

        f = file(path, 'rb')

        if filtered and self.supports_content_filtering():

            filters = self._content_filter_stack(filename)

            return _mod_filters.filtered_input_file(f, filters)

        else:

            return f

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

        """See Tree.get_file_lines()"""

        file = self.get_file(file_id, path, filtered=filtered)

        try:

            return file.readlines()

        finally:

            file.close()

    def get_parent_ids(self):

        """See Tree.get_parent_ids.

        This implementation reads the pending merges list and last_revision

        value and uses that to decide what the parents list should be.

        """

        last_rev = _mod_revision.ensure_null(self._last_revision())

        if _mod_revision.NULL_REVISION == last_rev:

            parents = []

        else:

            parents = [last_rev]

        try:

            merges_bytes = self._transport.get_bytes('pending-merges')

        except errors.NoSuchFile:

            pass

        else:

            for l in osutils.split_lines(merges_bytes):

                revision_id = l.rstrip('\n')

                parents.append(revision_id)

        return parents

    def get_root_id(self):

        """Return the id of this trees root"""

        raise NotImplementedError(self.get_root_id)

    @needs_read_lock

    def clone(self, to_controldir, revision_id=None):

        """Duplicate this working tree into to_bzr, including all state.

        Specifically modified files are kept as modified, but

        ignored and unknown files are discarded.

        If you want to make a new line of development, see ControlDir.sprout()

        revision

            If not None, the cloned tree will have its last revision set to

            revision, and difference between the source trees last revision

            and this one merged in.

        """

        # assumes the target bzr dir format is compatible.

        result = to_controldir.create_workingtree()

        self.copy_content_into(result, revision_id)

        return result

    @needs_read_lock

    def copy_content_into(self, tree, revision_id=None):

        """Copy the current content and user files of this tree into tree."""

        tree.set_root_id(self.get_root_id())

        if revision_id is None:

            merge.transform_tree(tree, self)

        else:

            # TODO now merge from tree.last_revision to revision (to preserve

            # user local changes)

            merge.transform_tree(tree, self)

            if revision_id == _mod_revision.NULL_REVISION:

                new_parents = []

            else:

                new_parents = [revision_id]

            tree.set_parent_ids(new_parents)

    def id2abspath(self, file_id):

        return self.abspath(self.id2path(file_id))

    def _check_for_tree_references(self, iterator):

        """See if directories have become tree-references."""

        blocked_parent_ids = set()

        for path, ie in iterator:

            if ie.parent_id in blocked_parent_ids:

                # This entry was pruned because one of its parents became a

                # TreeReference. If this is a directory, mark it as blocked.

                if ie.kind == 'directory':

                    blocked_parent_ids.add(ie.file_id)

                continue

            if ie.kind == 'directory' and self._directory_is_tree_reference(path):

                # This InventoryDirectory needs to be a TreeReference

                ie = inventory.TreeReference(ie.file_id, ie.name, ie.parent_id)

                blocked_parent_ids.add(ie.file_id)

            yield path, ie

    def iter_entries_by_dir(self, specific_file_ids=None, yield_parents=False):

        """See Tree.iter_entries_by_dir()"""

        # The only trick here is that if we supports_tree_reference then we

        # need to detect if a directory becomes a tree-reference.

        iterator = super(WorkingTree, self).iter_entries_by_dir(

                specific_file_ids=specific_file_ids,

                yield_parents=yield_parents)

        if not self.supports_tree_reference():

            return iterator

        else:

            return self._check_for_tree_references(iterator)

    def get_file_size(self, file_id):

        """See Tree.get_file_size"""

        # XXX: this returns the on-disk size; it should probably return the

        # canonical size

        try:

            return os.path.getsize(self.id2abspath(file_id))

        except OSError, e:

            if e.errno != errno.ENOENT:

                raise

            else:

                return None

    @needs_tree_write_lock

    def _gather_kinds(self, files, kinds):

        """See MutableTree._gather_kinds."""

        for pos, f in enumerate(files):

            if kinds[pos] is None:

                fullpath = normpath(self.abspath(f))

                try:

                    kinds[pos] = file_kind(fullpath)

                except OSError, e:

                    if e.errno == errno.ENOENT:

                        raise errors.NoSuchFile(fullpath)

    @needs_write_lock

    def add_parent_tree_id(self, revision_id, allow_leftmost_as_ghost=False):

        """Add revision_id as a parent.

        This is equivalent to retrieving the current list of parent ids

        and setting the list to its value plus revision_id.

        :param revision_id: The revision id to add to the parent list. It may

            be a ghost revision as long as its not the first parent to be

            added, or the allow_leftmost_as_ghost parameter is set True.

        :param allow_leftmost_as_ghost: Allow the first parent to be a ghost.

        """

        parents = self.get_parent_ids() + [revision_id]

        self.set_parent_ids(parents, allow_leftmost_as_ghost=len(parents) > 1

            or allow_leftmost_as_ghost)

    @needs_tree_write_lock

    def add_parent_tree(self, parent_tuple, allow_leftmost_as_ghost=False):

        """Add revision_id, tree tuple as a parent.

        This is equivalent to retrieving the current list of parent trees

        and setting the list to its value plus parent_tuple. See also

        add_parent_tree_id - if you only have a parent id available it will be

        simpler to use that api. If you have the parent already available, using

        this api is preferred.

        :param parent_tuple: The (revision id, tree) to add to the parent list.

            If the revision_id is a ghost, pass None for the tree.

        :param allow_leftmost_as_ghost: Allow the first parent to be a ghost.

        """

        parent_ids = self.get_parent_ids() + [parent_tuple[0]]

        if len(parent_ids) > 1:

            # the leftmost may have already been a ghost, preserve that if it

            # was.

            allow_leftmost_as_ghost = True

        self.set_parent_ids(parent_ids,

            allow_leftmost_as_ghost=allow_leftmost_as_ghost)

    @needs_tree_write_lock

    def add_pending_merge(self, *revision_ids):

        # TODO: Perhaps should check at this point that the

        # history of the revision is actually present?

        parents = self.get_parent_ids()

        updated = False

        for rev_id in revision_ids:

            if rev_id in parents:

                continue

            parents.append(rev_id)

            updated = True

        if updated:

            self.set_parent_ids(parents, allow_leftmost_as_ghost=True)

    def path_content_summary(self, path, _lstat=os.lstat,

        _mapper=osutils.file_kind_from_stat_mode):

        """See Tree.path_content_summary."""

        abspath = self.abspath(path)

        try:

            stat_result = _lstat(abspath)

        except OSError, e:

            if getattr(e, 'errno', None) == errno.ENOENT:

                # no file.

                return ('missing', None, None, None)

            # propagate other errors

            raise

        kind = _mapper(stat_result.st_mode)

        if kind == 'file':

            return self._file_content_summary(path, stat_result)

        elif kind == 'directory':

            # perhaps it looks like a plain directory, but it's really a

            # reference.

            if self._directory_is_tree_reference(path):

                kind = 'tree-reference'

            return kind, None, None, None

        elif kind == 'symlink':

            target = osutils.readlink(abspath)

            return ('symlink', None, None, target)