/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

"""Export trees to tarballs, non-controlled directories, zipfiles, etc.

"""

import errno

import os

import sys

import time

from . import (

    archive,

    errors,

    osutils,

    trace,

    )

def export(tree, dest, format=None, root=None, subdir=None,

           per_file_timestamps=False, fileobj=None):

    """Export the given Tree to the specific destination.

    :param tree: A Tree (such as RevisionTree) to export

    :param dest: The destination where the files,etc should be put

    :param format: The format (dir, zip, etc), if None, it will check the

                   extension on dest, looking for a match

    :param root: The root location inside the format.

                 It is common practise to have zipfiles and tarballs

                 extract into a subdirectory, rather than into the

                 current working directory.

                 If root is None, the default root will be

                 selected as the destination without its

                 extension.

    :param subdir: A starting directory within the tree. None means to export

        the entire tree, and anything else should specify the relative path to

        a directory to start exporting from.

    :param per_file_timestamps: Whether to use the timestamp stored in the

        tree rather than now(). This will do a revision lookup

        for every file so will be significantly slower.

    :param fileobj: Optional file object to use

    """

    if format is None and dest is not None:

        format = guess_format(dest)

    # Most of the exporters will just have to call

    # this function anyway, so why not do it for them

    if root is None:

        root = get_root_name(dest)

    if not per_file_timestamps:

        force_mtime = time.time()

        if getattr(tree, '_repository', None):

            try:

                force_mtime = tree._repository.get_revision(

                    tree.get_revision_id()).timestamp

            except errors.NoSuchRevision:

                pass

    else:

        force_mtime = None

    trace.mutter('export version %r', tree)

    if format == 'dir':

        # TODO(jelmer): If the tree is remote (e.g. HPSS, Git Remote),

        # then we should stream a tar file and unpack that on the fly.

        with tree.lock_read():

            for unused in dir_exporter_generator(tree, dest, root, subdir,

                                                 force_mtime):

                pass

        return

    with tree.lock_read():

        chunks = tree.archive(format, dest, root=root,

                              subdir=subdir, force_mtime=force_mtime)

        if dest == '-':

            for chunk in chunks:

                getattr(sys.stdout, 'buffer', sys.stdout).write(chunk)

        elif fileobj is not None:

            for chunk in chunks:

                fileobj.write(chunk)

        else:

            with open(dest, 'wb') as f:

                for chunk in chunks:

                    f.write(chunk)

def guess_format(filename, default='dir'):

    """Guess the export format based on a file name.

    :param filename: Filename to guess from

    :param default: Default format to fall back to

    :return: format name

    """

    format = archive.format_registry.get_format_from_filename(filename)

    if format is None:

        format = default

    return format

def get_root_name(dest):

    """Get just the root name for an export.

    """

    global _exporter_extensions

    if dest == '-':

        # Exporting to -/foo doesn't make sense so use relative paths.

        return ''

    dest = os.path.basename(dest)

    for ext in archive.format_registry.extensions:

        if dest.endswith(ext):

            return dest[:-len(ext)]

    return dest

def _export_iter_entries(tree, subdir, skip_special=True):

    """Iter the entries for tree suitable for exporting.

    :param tree: A tree object.

    :param subdir: None or the path of an entry to start exporting from.

    :param skip_special: Whether to skip .bzr files.

    :return: iterator over tuples with final path, tree path and inventory

        entry for each entry to export

    """

    if subdir == '':

        subdir = None

    if subdir is not None:

        subdir = subdir.rstrip('/')

    entries = tree.iter_entries_by_dir()

    for path, entry in entries:

        if path == '':

            continue

        # The .bzr* namespace is reserved for "magic" files like

        # .bzrignore and .bzrrules - do not export these

        if skip_special and path.startswith(".bzr"):

            continue

        if path == subdir:

            if entry.kind == 'directory':

                continue

            final_path = entry.name

        elif subdir is not None:

            if path.startswith(subdir + '/'):

                final_path = path[len(subdir) + 1:]

            else:

                continue

        else:

            final_path = path

        if not tree.has_filename(path):

            continue

        yield final_path, path, entry

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.

    :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 as 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):

        file_id = getattr(ie, 'file_id', None)

        fullpath = osutils.pathjoin(dest, dp)

        if ie.kind == "file":

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

        elif ie.kind in ("directory", "tree-reference"):

            os.mkdir(fullpath)

        elif ie.kind == "symlink":

            try:

                symlink_target = tree.get_symlink_target(tp)

                os.symlink(symlink_target, fullpath)

            except OSError as 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" %

                                  (tp, 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 = 0o666

        if tree.is_executable(treepath):

            mode = 0o777

        with os.fdopen(os.open(fullpath, flags, mode), 'wb') as out:

            out.writelines(chunks)

        if force_mtime is not None:

            mtime = force_mtime

        else:

            mtime = tree.get_file_mtime(treepath)

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

        yield