~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

"""Export a bzrlib.tree.Tree to a new or empty directory."""

from __future__ import absolute_import

import errno

import os

from bzrlib import errors, osutils

from bzrlib.export import _export_iter_entries

def dir_exporter_generator(tree, dest, root, subdir=None,

                           force_mtime=None, fileobj=None):

    """Return a generator that exports this tree to a new directory.

    `dest` should either not exist or should be empty. If it does not exist it

    will be created holding the contents of this tree.

    :param fileobj: Is not used in this exporter

    :note: If the export fails, the destination directory will be

           left in an incompletely exported state: export is not transactional.

    """

    try:

        os.mkdir(dest)

    except OSError, e:

        if e.errno == errno.EEXIST:

            # check if directory empty

            if os.listdir(dest) != []:

                raise errors.BzrError(

                    "Can't export tree to non-empty directory.")

        else:

            raise

    # Iterate everything, building up the files we will want to export, and

    # creating the directories and symlinks that we need.

    # This tracks (file_id, (destination_path, executable))

    # This matches the api that tree.iter_files_bytes() wants

    # Note in the case of revision trees, this does trigger a double inventory

    # lookup, hopefully it isn't too expensive.

    to_fetch = []

    for dp, tp, ie in _export_iter_entries(tree, subdir):

        fullpath = osutils.pathjoin(dest, dp)

        if ie.kind == "file":

            to_fetch.append((ie.file_id, (dp, tp, ie.file_id)))

        elif ie.kind == "directory":

            os.mkdir(fullpath)

        elif ie.kind == "symlink":

            try:

                symlink_target = tree.get_symlink_target(ie.file_id, tp)

                os.symlink(symlink_target, fullpath)

            except OSError, e:

                raise errors.BzrError(

                    "Failed to create symlink %r -> %r, error: %s"

                    % (fullpath, symlink_target, e))

        else:

            raise errors.BzrError("don't know how to export {%s} of kind %r" %

               (ie.file_id, ie.kind))

        yield

    # The data returned here can be in any order, but we've already created all

    # the directories

    flags = os.O_CREAT | os.O_TRUNC | os.O_WRONLY | getattr(os, 'O_BINARY', 0)

    for (relpath, treepath, file_id), chunks in tree.iter_files_bytes(to_fetch):

        fullpath = osutils.pathjoin(dest, relpath)

        # We set the mode and let the umask sort out the file info

        mode = 0666

        if tree.is_executable(file_id, treepath):

            mode = 0777

        out = os.fdopen(os.open(fullpath, flags, mode), 'wb')

        try:

            out.writelines(chunks)

        finally:

            out.close()

        if force_mtime is not None:

            mtime = force_mtime

        else:

            mtime = tree.get_file_mtime(file_id, treepath)

        os.utime(fullpath, (mtime, mtime))

        yield