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bzrlib/transform.py

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# Copyright (C) 2006-2010 Canonical Ltd

 

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# Copyright (C) 2006, 2007, 2008, 2009 Canonical Ltd

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#

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# This program is free software; you can redistribute it and/or modify

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# it under the terms of the GNU General Public License as published by

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import os

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import errno

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from stat import S_ISREG, S_IEXEC

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import time

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from bzrlib.lazy_import import lazy_import

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lazy_import(globals(), """

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

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

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        if parent is None:

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

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        if trans_id == self._new_root:

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            raise CantMoveRoot

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        self._new_name[trans_id] = name

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        self._new_parent[trans_id] = parent

 

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        if parent == ROOT_PARENT:

 

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            if self._new_root is not None:

 

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                raise ValueError("Cannot have multiple roots.")

 

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            self._new_root = trans_id

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    def adjust_root_path(self, name, parent):

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

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        self.version_file(old_root_file_id, old_root)

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        self.unversion_file(self._new_root)

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    def fixup_new_roots(self):

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        """Reinterpret requests to change the root directory

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

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

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        existing root directory.

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

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

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        irrelevant.

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        """

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

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                     ROOT_PARENT]

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        if len(new_roots) < 1:

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            return

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        if len(new_roots) != 1:

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

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        if self._new_root is None:

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            self._new_root = new_roots[0]

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            return

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        old_new_root = new_roots[0]

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        # TODO: What to do if a old_new_root is present, but self._new_root is

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        #       not listed as being removed? This code explicitly unversions

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        #       the old root and versions it with the new file_id. Though that

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        #       seems like an incomplete delta

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        # unversion the new root's directory.

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        file_id = self.final_file_id(old_new_root)

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        if old_new_root in self._new_id:

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            self.cancel_versioning(old_new_root)

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        else:

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            self.unversion_file(old_new_root)

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

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        # stick a new one in.

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

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            self._new_root not in self._removed_id):

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            self.unversion_file(self._new_root)

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        self.version_file(file_id, self._new_root)

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

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

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        # use directly-- some tree children have new parents

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        list(self.iter_tree_children(old_new_root))

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

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

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

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        # Ensure old_new_root has no directory.

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        if old_new_root in self._new_contents:

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            self.cancel_creation(old_new_root)

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        else:

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            self.delete_contents(old_new_root)

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        # prevent deletion of root directory.

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        if self._new_root in self._removed_contents:

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            self.cancel_deletion(self._new_root)

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        # destroy path info for old_new_root.

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        del self._new_parent[old_new_root]

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        del self._new_name[old_new_root]

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    def trans_id_tree_file_id(self, inventory_id):

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

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    def delete_contents(self, trans_id):

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

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        # Ensure that the object exists in the WorkingTree, this will raise an

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        # exception if there is a problem

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        self.tree_kind(trans_id)

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        self._removed_contents.add(trans_id)

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        self._limbo_children_names = {}

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        # List of transform ids that need to be renamed from limbo into place

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        self._needs_rename = set()

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        self._creation_mtime = None

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    def finalize(self):

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        """Release the working tree lock, if held, clean up limbo dir.

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        if (trans_id in self._limbo_files and

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            trans_id not in self._needs_rename):

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            self._rename_in_limbo([trans_id])

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            if previous_parent != parent:

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                self._limbo_children[previous_parent].remove(trans_id)

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            if previous_parent != parent or previous_name != name:

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                del self._limbo_children_names[previous_parent][previous_name]

 

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            self._limbo_children[previous_parent].remove(trans_id)

 

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            del self._limbo_children_names[previous_parent][previous_name]

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    def _rename_in_limbo(self, trans_ids):

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        """Fix limbo names so that the right final path is produced.

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            f.writelines(contents)

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        finally:

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            f.close()

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        self._set_mtime(name)

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        self._set_mode(trans_id, mode_id, S_ISREG)

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    def _read_file_chunks(self, trans_id):

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    def _read_symlink_target(self, trans_id):

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        return os.readlink(self._limbo_name(trans_id))

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    def _set_mtime(self, path):

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        """All files that are created get the same mtime.

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        This time is set by the first object to be created.

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        """

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        if self._creation_mtime is None:

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            self._creation_mtime = time.time()

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        os.utime(path, (self._creation_mtime, self._creation_mtime))

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    def create_hardlink(self, path, trans_id):

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        """Schedule creation of a hard link"""

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        name = self._limbo_name(trans_id)

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                child_pb.update('removing file', num, len(tree_paths))

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                full_path = self._tree.abspath(path)

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                if trans_id in self._removed_contents:

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                    delete_path = os.path.join(self._deletiondir, trans_id)

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                    mover.pre_delete(full_path, delete_path)

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                elif (trans_id in self._new_name

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                      or trans_id in self._new_parent):

 

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                    mover.pre_delete(full_path, os.path.join(self._deletiondir,

 

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                                     trans_id))

 

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                elif trans_id in self._new_name or trans_id in \

 

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                    self._new_parent:

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                    try:

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                        mover.rename(full_path, self._limbo_name(trans_id))

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                    except OSError, e:

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        new_desired_files = desired_files

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    else:

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        iter = accelerator_tree.iter_changes(tree, include_unchanged=True)

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        unchanged = [(f, p[1]) for (f, p, c, v, d, n, k, e)

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                     in iter if not (c or e[0] != e[1])]

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        if accelerator_tree.supports_content_filtering():

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            unchanged = [(f, p) for (f, p) in unchanged

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                         if not accelerator_tree.iter_search_rules([p]).next()]

2383

 

        unchanged = dict(unchanged)

 

2303

        unchanged = dict((f, p[1]) for (f, p, c, v, d, n, k, e)

 

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                         in iter if not (c or e[0] != e[1]))

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        new_desired_files = []

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        count = 0

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        for file_id, (trans_id, tree_path) in desired_files:

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        tt.create_directory(trans_id)

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2512

 

def create_from_tree(tt, trans_id, tree, file_id, bytes=None,

2513

 

    filter_tree_path=None):

2514

 

    """Create new file contents according to tree contents.

2515

 

    

2516

 

    :param filter_tree_path: the tree path to use to lookup

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      content filters to apply to the bytes output in the working tree.

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      This only applies if the working tree supports content filtering.

2519

 

    """

 

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def create_from_tree(tt, trans_id, tree, file_id, bytes=None):

 

2434

    """Create new file contents according to tree contents."""

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2435

    kind = tree.kind(file_id)

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2436

    if kind == 'directory':

2522

2437

        tt.create_directory(trans_id)

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2442

                bytes = tree_file.readlines()

2528

2443

            finally:

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                tree_file.close()

2530

 

        wt = tt._tree

2531

 

        if wt.supports_content_filtering() and filter_tree_path is not None:

2532

 

            filters = wt._content_filter_stack(filter_tree_path)

2533

 

            bytes = filtered_output_bytes(bytes, filters,

2534

 

                ContentFilterContext(filter_tree_path, tree))

2535

2445

        tt.create_file(bytes, trans_id)

2536

2446

    elif kind == "symlink":

2537

2447

        tt.create_symlink(tree.get_symlink_target(file_id), trans_id)

2725

2635

                    parent_trans = ROOT_PARENT

2726

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                else:

2727

2637

                    parent_trans = tt.trans_id_file_id(parent[1])

2728

 

                if parent[0] is None and versioned[0]:

2729

 

                    tt.adjust_root_path(name[1], parent_trans)

2730

 

                else:

2731

 

                    tt.adjust_path(name[1], parent_trans, trans_id)

 

2638

                tt.adjust_path(name[1], parent_trans, trans_id)

2732

2639

            if executable[0] != executable[1] and kind[1] == "file":

2733

2640

                tt.set_executability(executable[1], trans_id)

2734

2641

        if working_tree.supports_content_filtering():

2747

2654

            for (trans_id, mode_id), bytes in target_tree.iter_files_bytes(

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2655

                deferred_files):

2749

2656

                tt.create_file(bytes, trans_id, mode_id)

2750

 

        tt.fixup_new_roots()

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    finally:

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        if basis_tree is not None:

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            basis_tree.unlock()

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