~bzr-pqm/bzr/bzr.dev

# 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

from __future__ import absolute_import

import os

import errno

from stat import S_ISREG, S_IEXEC

import time

from bzrlib import (

    config as _mod_config,

    errors,

    lazy_import,

    registry,

    trace,

    tree,

    )

lazy_import.lazy_import(globals(), """

from bzrlib import (

    annotate,

    bencode,

    controldir,

    commit,

    conflicts,

    delta,

    inventory,

    multiparent,

    osutils,

    revision as _mod_revision,

    ui,

    urlutils,

    )

from bzrlib.i18n import gettext

""")

from bzrlib.errors import (DuplicateKey, MalformedTransform,

                           ReusingTransform, CantMoveRoot,

                           ImmortalLimbo, NoFinalPath,

                           UnableCreateSymlink)

from bzrlib.filters import filtered_output_bytes, ContentFilterContext

from bzrlib.mutabletree import MutableTree

from bzrlib.osutils import (

    delete_any,

    file_kind,

    has_symlinks,

    pathjoin,

    sha_file,

    splitpath,

    )

from bzrlib.progress import ProgressPhase

from bzrlib.symbol_versioning import (

    deprecated_function,

    deprecated_in,

    deprecated_method,

    )

ROOT_PARENT = "root-parent"

def unique_add(map, key, value):

    if key in map:

        raise DuplicateKey(key=key)

    map[key] = value

class _TransformResults(object):

    def __init__(self, modified_paths, rename_count):

        object.__init__(self)

        self.modified_paths = modified_paths

        self.rename_count = rename_count

class TreeTransformBase(object):

    """The base class for TreeTransform and its kin."""

    def __init__(self, tree, pb=None,

                 case_sensitive=True):

        """Constructor.

        :param tree: The tree that will be transformed, but not necessarily

            the output tree.

        :param pb: ignored

        :param case_sensitive: If True, the target of the transform is

            case sensitive, not just case preserving.

        """

        object.__init__(self)

        self._tree = tree

        self._id_number = 0

        # mapping of trans_id -> new basename

        self._new_name = {}

        # mapping of trans_id -> new parent trans_id

        self._new_parent = {}

        # mapping of trans_id with new contents -> new file_kind

        self._new_contents = {}

        # mapping of trans_id => (sha1 of content, stat_value)

        self._observed_sha1s = {}

        # Set of trans_ids whose contents will be removed

        self._removed_contents = set()

        # Mapping of trans_id -> new execute-bit value

        self._new_executability = {}

        # Mapping of trans_id -> new tree-reference value

        self._new_reference_revision = {}

        # Mapping of trans_id -> new file_id

        self._new_id = {}

        # Mapping of old file-id -> trans_id

        self._non_present_ids = {}

        # Mapping of new file_id -> trans_id

        self._r_new_id = {}

        # Set of trans_ids that will be removed

        self._removed_id = set()

        # Mapping of path in old tree -> trans_id

        self._tree_path_ids = {}

        # Mapping trans_id -> path in old tree

        self._tree_id_paths = {}

        # The trans_id that will be used as the tree root

        root_id = tree.get_root_id()

        if root_id is not None:

            self._new_root = self.trans_id_tree_file_id(root_id)

        else:

            self._new_root = None

        # Indicator of whether the transform has been applied

        self._done = False

        # A progress bar

        self._pb = pb

        # Whether the target is case sensitive

        self._case_sensitive_target = case_sensitive

        # A counter of how many files have been renamed

        self.rename_count = 0

    def __enter__(self):

        """Support Context Manager API."""

        return self

    def __exit__(self, exc_type, exc_val, exc_tb):

        """Support Context Manager API."""

        self.finalize()

    def finalize(self):

        """Release the working tree lock, if held.

        This is required if apply has not been invoked, but can be invoked

        even after apply.

        """

        if self._tree is None:

            return

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

            hook(self._tree, self)

        self._tree.unlock()

        self._tree = None

    def __get_root(self):

        return self._new_root

    root = property(__get_root)

    def _assign_id(self):

        """Produce a new tranform id"""

        new_id = "new-%s" % self._id_number

        self._id_number +=1

        return new_id

    def create_path(self, name, parent):

        """Assign a transaction id to a new path"""

        trans_id = self._assign_id()

        unique_add(self._new_name, trans_id, name)

        unique_add(self._new_parent, trans_id, parent)

        return trans_id

    def adjust_path(self, name, parent, trans_id):

        """Change the path that is assigned to a transaction id."""

        if parent is None:

            raise ValueError("Parent trans-id may not be None")

        if trans_id == self._new_root:

            raise CantMoveRoot

        self._new_name[trans_id] = name

        self._new_parent[trans_id] = parent

    def adjust_root_path(self, name, parent):

        """Emulate moving the root by moving all children, instead.

        We do this by undoing the association of root's transaction id with the

        current tree.  This allows us to create a new directory with that

        transaction id.  We unversion the root directory and version the

        physically new directory, and hope someone versions the tree root

        later.

        """

        old_root = self._new_root

        old_root_file_id = self.final_file_id(old_root)

        # force moving all children of root

        for child_id in self.iter_tree_children(old_root):

            if child_id != parent:

                self.adjust_path(self.final_name(child_id),

                                 self.final_parent(child_id), child_id)

            file_id = self.final_file_id(child_id)

            if file_id is not None:

                self.unversion_file(child_id)

            self.version_file(file_id, child_id)

        # the physical root needs a new transaction id

        self._tree_path_ids.pop("")

        self._tree_id_paths.pop(old_root)

        self._new_root = self.trans_id_tree_file_id(self._tree.get_root_id())

        if parent == old_root:

            parent = self._new_root

        self.adjust_path(name, parent, old_root)

        self.create_directory(old_root)

        self.version_file(old_root_file_id, old_root)

        self.unversion_file(self._new_root)

    def fixup_new_roots(self):

        """Reinterpret requests to change the root directory

        Instead of creating a root directory, or moving an existing directory,

        all the attributes and children of the new root are applied to the

        existing root directory.

        This means that the old root trans-id becomes obsolete, so it is

        recommended only to invoke this after the root trans-id has become

        irrelevant.

        """

        new_roots = [k for k, v in self._new_parent.iteritems() if v ==

                     ROOT_PARENT]

        if len(new_roots) < 1:

            return

        if len(new_roots) != 1:

            raise ValueError('A tree cannot have two roots!')

        if self._new_root is None:

            self._new_root = new_roots[0]

            return

        old_new_root = new_roots[0]

        # unversion the new root's directory.

        if self.final_kind(self._new_root) is None:

            file_id = self.final_file_id(old_new_root)

        else:

            file_id = self.final_file_id(self._new_root)

        if old_new_root in self._new_id:

            self.cancel_versioning(old_new_root)

        else:

            self.unversion_file(old_new_root)

        # if, at this stage, root still has an old file_id, zap it so we can

        # stick a new one in.

        if (self.tree_file_id(self._new_root) is not None and

            self._new_root not in self._removed_id):

            self.unversion_file(self._new_root)

        if file_id is not None:

            self.version_file(file_id, self._new_root)

        # Now move children of new root into old root directory.

        # Ensure all children are registered with the transaction, but don't

        # use directly-- some tree children have new parents

        list(self.iter_tree_children(old_new_root))

        # Move all children of new root into old root directory.

        for child in self.by_parent().get(old_new_root, []):

            self.adjust_path(self.final_name(child), self._new_root, child)

        # Ensure old_new_root has no directory.

        if old_new_root in self._new_contents:

            self.cancel_creation(old_new_root)

        else:

            self.delete_contents(old_new_root)

        # prevent deletion of root directory.

        if self._new_root in self._removed_contents:

            self.cancel_deletion(self._new_root)

        # destroy path info for old_new_root.

        del self._new_parent[old_new_root]

        del self._new_name[old_new_root]

    def trans_id_tree_file_id(self, inventory_id):

        """Determine the transaction id of a working tree file.

        This reflects only files that already exist, not ones that will be

        added by transactions.

        """

        if inventory_id is None:

            raise ValueError('None is not a valid file id')

        path = self._tree.id2path(inventory_id)

        return self.trans_id_tree_path(path)

    def trans_id_file_id(self, file_id):

        """Determine or set the transaction id associated with a file ID.

        A new id is only created for file_ids that were never present.  If

        a transaction has been unversioned, it is deliberately still returned.

        (this will likely lead to an unversioned parent conflict.)

        """

        if file_id is None:

            raise ValueError('None is not a valid file id')

        if file_id in self._r_new_id and self._r_new_id[file_id] is not None:

            return self._r_new_id[file_id]

        else:

            try:

                self._tree.iter_entries_by_dir([file_id]).next()

            except StopIteration:

                if file_id in self._non_present_ids:

                    return self._non_present_ids[file_id]

                else:

                    trans_id = self._assign_id()

                    self._non_present_ids[file_id] = trans_id

                    return trans_id

            else:

                return self.trans_id_tree_file_id(file_id)

    def trans_id_tree_path(self, path):

        """Determine (and maybe set) the transaction ID for a tree path."""

        path = self.canonical_path(path)

        if path not in self._tree_path_ids:

            self._tree_path_ids[path] = self._assign_id()

            self._tree_id_paths[self._tree_path_ids[path]] = path

        return self._tree_path_ids[path]

    def get_tree_parent(self, trans_id):

        """Determine id of the parent in the tree."""

        path = self._tree_id_paths[trans_id]

        if path == "":

            return ROOT_PARENT

        return self.trans_id_tree_path(os.path.dirname(path))

    def delete_contents(self, trans_id):

        """Schedule the contents of a path entry for deletion"""

        kind = self.tree_kind(trans_id)

        if kind is not None:

            self._removed_contents.add(trans_id)

    def cancel_deletion(self, trans_id):

        """Cancel a scheduled deletion"""

        self._removed_contents.remove(trans_id)

    def unversion_file(self, trans_id):

        """Schedule a path entry to become unversioned"""

        self._removed_id.add(trans_id)

    def delete_versioned(self, trans_id):

        """Delete and unversion a versioned file"""

        self.delete_contents(trans_id)

        self.unversion_file(trans_id)

    def set_executability(self, executability, trans_id):

        """Schedule setting of the 'execute' bit

        To unschedule, set to None

        """

        if executability is None:

            del self._new_executability[trans_id]

        else:

            unique_add(self._new_executability, trans_id, executability)

    def set_tree_reference(self, revision_id, trans_id):

        """Set the reference associated with a directory"""

        unique_add(self._new_reference_revision, trans_id, revision_id)

    def version_file(self, file_id, trans_id):

        """Schedule a file to become versioned."""

        if file_id is None:

            raise ValueError()

        unique_add(self._new_id, trans_id, file_id)

        unique_add(self._r_new_id, file_id, trans_id)

    def cancel_versioning(self, trans_id):

        """Undo a previous versioning of a file"""

        file_id = self._new_id[trans_id]

        del self._new_id[trans_id]

        del self._r_new_id[file_id]

    def new_paths(self, filesystem_only=False):

        """Determine the paths of all new and changed files.

        :param filesystem_only: if True, only calculate values for files

            that require renames or execute bit changes.

        """

        new_ids = set()

        if filesystem_only:

            stale_ids = self._needs_rename.difference(self._new_name)

            stale_ids.difference_update(self._new_parent)

            stale_ids.difference_update(self._new_contents)

            stale_ids.difference_update(self._new_id)

            needs_rename = self._needs_rename.difference(stale_ids)

            id_sets = (needs_rename, self._new_executability)

        else:

            id_sets = (self._new_name, self._new_parent, self._new_contents,

                       self._new_id, self._new_executability)

        for id_set in id_sets:

            new_ids.update(id_set)

        return sorted(FinalPaths(self).get_paths(new_ids))

    def _inventory_altered(self):

        """Determine which trans_ids need new Inventory entries.

        An new entry is needed when anything that would be reflected by an

        inventory entry changes, including file name, file_id, parent file_id,

        file kind, and the execute bit.

        Some care is taken to return entries with real changes, not cases

        where the value is deleted and then restored to its original value,

        but some actually unchanged values may be returned.

        :returns: A list of (path, trans_id) for all items requiring an

            inventory change. Ordered by path.

        """

        changed_ids = set()

        # Find entries whose file_ids are new (or changed).

        new_file_id = set(t for t in self._new_id

                          if self._new_id[t] != self.tree_file_id(t))

        for id_set in [self._new_name, self._new_parent, new_file_id,

                       self._new_executability]:

            changed_ids.update(id_set)

        # removing implies a kind change

        changed_kind = set(self._removed_contents)

        # so does adding

        changed_kind.intersection_update(self._new_contents)

        # Ignore entries that are already known to have changed.

        changed_kind.difference_update(changed_ids)

        #  to keep only the truly changed ones

        changed_kind = (t for t in changed_kind

                        if self.tree_kind(t) != self.final_kind(t))

        # all kind changes will alter the inventory

        changed_ids.update(changed_kind)

        # To find entries with changed parent_ids, find parents which existed,

        # but changed file_id.

        changed_file_id = set(t for t in new_file_id if t in self._removed_id)

        # Now add all their children to the set.

        for parent_trans_id in new_file_id:

            changed_ids.update(self.iter_tree_children(parent_trans_id))

        return sorted(FinalPaths(self).get_paths(changed_ids))

    def final_kind(self, trans_id):

        """Determine the final file kind, after any changes applied.

        :return: None if the file does not exist/has no contents.  (It is

            conceivable that a path would be created without the corresponding

            contents insertion command)

        """

        if trans_id in self._new_contents:

            return self._new_contents[trans_id]

        elif trans_id in self._removed_contents:

            return None

        else:

            return self.tree_kind(trans_id)

    def tree_file_id(self, trans_id):

        """Determine the file id associated with the trans_id in the tree"""

        try:

            path = self._tree_id_paths[trans_id]

        except KeyError:

            # the file is a new, unversioned file, or invalid trans_id

            return None

        # the file is old; the old id is still valid

        if self._new_root == trans_id:

            return self._tree.get_root_id()

        return self._tree.path2id(path)

    def final_file_id(self, trans_id):

        """Determine the file id after any changes are applied, or None.

        None indicates that the file will not be versioned after changes are

        applied.

        """

        try:

            return self._new_id[trans_id]

        except KeyError:

            if trans_id in self._removed_id:

                return None

        return self.tree_file_id(trans_id)

    def inactive_file_id(self, trans_id):

        """Return the inactive file_id associated with a transaction id.

        That is, the one in the tree or in non_present_ids.

        The file_id may actually be active, too.

        """

        file_id = self.tree_file_id(trans_id)

        if file_id is not None:

            return file_id

        for key, value in self._non_present_ids.iteritems():

            if value == trans_id:

                return key

    def final_parent(self, trans_id):

        """Determine the parent file_id, after any changes are applied.

        ROOT_PARENT is returned for the tree root.

        """

        try:

            return self._new_parent[trans_id]

        except KeyError:

            return self.get_tree_parent(trans_id)

    def final_name(self, trans_id):

        """Determine the final filename, after all changes are applied."""

        try:

            return self._new_name[trans_id]

        except KeyError:

            try:

                return os.path.basename(self._tree_id_paths[trans_id])

            except KeyError:

                raise NoFinalPath(trans_id, self)

    def by_parent(self):

        """Return a map of parent: children for known parents.

        Only new paths and parents of tree files with assigned ids are used.

        """

        by_parent = {}

        items = list(self._new_parent.iteritems())

        items.extend((t, self.final_parent(t)) for t in

                      self._tree_id_paths.keys())

        for trans_id, parent_id in items:

            if parent_id not in by_parent:

                by_parent[parent_id] = set()

            by_parent[parent_id].add(trans_id)

        return by_parent

    def path_changed(self, trans_id):

        """Return True if a trans_id's path has changed."""

        return (trans_id in self._new_name) or (trans_id in self._new_parent)

    def new_contents(self, trans_id):

        return (trans_id in self._new_contents)

    def find_conflicts(self):

        """Find any violations of inventory or filesystem invariants"""

        if self._done is True:

            raise ReusingTransform()

        conflicts = []

        # ensure all children of all existent parents are known

        # all children of non-existent parents are known, by definition.

        self._add_tree_children()

        by_parent = self.by_parent()

        conflicts.extend(self._unversioned_parents(by_parent))

        conflicts.extend(self._parent_loops())

        conflicts.extend(self._duplicate_entries(by_parent))

        conflicts.extend(self._duplicate_ids())

        conflicts.extend(self._parent_type_conflicts(by_parent))

        conflicts.extend(self._improper_versioning())

        conflicts.extend(self._executability_conflicts())

        conflicts.extend(self._overwrite_conflicts())

        return conflicts

    def _check_malformed(self):

        conflicts = self.find_conflicts()

        if len(conflicts) != 0:

            raise MalformedTransform(conflicts=conflicts)

    def _add_tree_children(self):

        """Add all the children of all active parents to the known paths.

        Active parents are those which gain children, and those which are

        removed.  This is a necessary first step in detecting conflicts.

        """

        parents = self.by_parent().keys()

        parents.extend([t for t in self._removed_contents if

                        self.tree_kind(t) == 'directory'])

        for trans_id in self._removed_id:

            file_id = self.tree_file_id(trans_id)

            if file_id is not None:

                if self._tree.stored_kind(file_id) == 'directory':

                    parents.append(trans_id)

            elif self.tree_kind(trans_id) == 'directory':

                parents.append(trans_id)

        for parent_id in parents:

            # ensure that all children are registered with the transaction

            list(self.iter_tree_children(parent_id))

    def _has_named_child(self, name, parent_id, known_children):

        """Does a parent already have a name child.

        :param name: The searched for name.

        :param parent_id: The parent for which the check is made.

        :param known_children: The already known children. This should have

            been recently obtained from `self.by_parent.get(parent_id)`

            (or will be if None is passed).

        """

        if known_children is None:

            known_children = self.by_parent().get(parent_id, [])

        for child in known_children:

            if self.final_name(child) == name:

                return True

        parent_path = self._tree_id_paths.get(parent_id, None)

        if parent_path is None:

            # No parent... no children

            return False

        child_path = joinpath(parent_path, name)

        child_id = self._tree_path_ids.get(child_path, None)

        if child_id is None:

            # Not known by the tree transform yet, check the filesystem

            return osutils.lexists(self._tree.abspath(child_path))

        else:

            raise AssertionError('child_id is missing: %s, %s, %s'

                                 % (name, parent_id, child_id))

    def _available_backup_name(self, name, target_id):

        """Find an available backup name.

        :param name: The basename of the file.

        :param target_id: The directory trans_id where the backup should 

            be placed.

        """

        known_children = self.by_parent().get(target_id, [])

        return osutils.available_backup_name(

            name,

            lambda base: self._has_named_child(

                base, target_id, known_children))

    def _parent_loops(self):

        """No entry should be its own ancestor"""

        conflicts = []

        for trans_id in self._new_parent:

            seen = set()

            parent_id = trans_id

            while parent_id != ROOT_PARENT:

                seen.add(parent_id)

                try:

                    parent_id = self.final_parent(parent_id)

                except KeyError:

                    break

                if parent_id == trans_id:

                    conflicts.append(('parent loop', trans_id))