~bzr-pqm/bzr/bzr.dev

# Copyright (C) 2005, 2006, 2008-2011 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 tree to a tarball."""

import os

import StringIO

import sys

import tarfile

from bzrlib import (

    errors,

    osutils,

    )

from bzrlib.export import _export_iter_entries

def prepare_tarball_item(tree, root, final_path, entry, force_mtime=None):

    """Prepare a tarball item for exporting

    :param tree: Tree to export

    :param final_path: Final path to place item

    :param entry: Entry to export

    :param force_mtime: Option mtime to force, instead of using tree

        timestamps.

    Returns a (tarinfo, fileobj) tuple

    """

    filename = osutils.pathjoin(root, final_path).encode('utf8')

    item = tarfile.TarInfo(filename)

    if force_mtime is not None:

        item.mtime = force_mtime

    else:

        item.mtime = tree.get_file_mtime(entry.file_id, final_path)

    if entry.kind == "file":

        item.type = tarfile.REGTYPE

        if tree.is_executable(entry.file_id):

            item.mode = 0755

        else:

            item.mode = 0644

        # This brings the whole file into memory, but that's almost needed for

        # the tarfile contract, which wants the size of the file up front.  We

        # want to make sure it doesn't change, and we need to read it in one

        # go for content filtering.

        content = tree.get_file_text(entry.file_id)

        item.size = len(content)

        fileobj = StringIO.StringIO(content)

    elif entry.kind == "directory":

        item.type = tarfile.DIRTYPE

        item.name += '/'

        item.size = 0

        item.mode = 0755

        fileobj = None

    elif entry.kind == "symlink":

        item.type = tarfile.SYMTYPE

        item.size = 0

        item.mode = 0755

        item.linkname = tree.get_symlink_target(entry.file_id)

        fileobj = None

    else:

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

                              % (entry.file_id, entry.kind))

    return (item, fileobj)

def export_tarball_generator(tree, ball, root, subdir=None, force_mtime=None):

    """Export tree contents to a tarball.

    :returns: A generator that will repeatedly produce None as each file is

        emitted.  The entire generator must be consumed to complete writing

        the file.

    :param tree: Tree to export

    :param ball: Tarball to export to; it will be closed when writing is

        complete.

    :param subdir: Sub directory to export

    :param force_mtime: Option mtime to force, instead of using tree

        timestamps.

    """

    try:

        for final_path, entry in _export_iter_entries(tree, subdir):

            (item, fileobj) = prepare_tarball_item(

                tree, root, final_path, entry, force_mtime)

            ball.addfile(item, fileobj)

            yield

    finally:

        ball.close()

def tgz_exporter_generator(tree, dest, root, subdir, force_mtime=None,

    fileobj=None):

    """Export this tree to a new tar file.

    `dest` will be created holding the contents of this tree; if it

    already exists, it will be clobbered, like with "tar -c".

    """

    import gzip

    if force_mtime is not None:

        root_mtime = force_mtime

    elif (getattr(tree, "repository", None) and

          getattr(tree, "get_revision_id", None)):

        # If this is a revision tree, use the revisions' timestamp

        rev = tree.repository.get_revision(tree.get_revision_id())

        root_mtime = rev.timestamp

    elif tree.get_root_id() is not None:

        root_mtime = tree.get_file_mtime(tree.get_root_id())

    else:

        root_mtime = None

    is_stdout = False

    basename = None

    if fileobj is not None:

        stream = fileobj

    elif dest == '-':

        stream = sys.stdout

        is_stdout = True

    else:

        stream = open(dest, 'wb')

        # gzip file is used with an explicit fileobj so that

        # the basename can be stored in the gzip file rather than

        # dest. (bug 102234)

        basename = os.path.basename(dest)

    try:

        zipstream = gzip.GzipFile(basename, 'w', fileobj=stream,

                                  mtime=root_mtime)

    except TypeError:

        # Python < 2.7 doesn't support the mtime argument

        zipstream = gzip.GzipFile(basename, 'w', fileobj=stream)

    ball = tarfile.open(None, 'w|', fileobj=zipstream)

    for _ in export_tarball_generator(

        tree, ball, root, subdir, force_mtime):

        yield

    # Closing zipstream may trigger writes to stream

    zipstream.close()

    if not is_stdout:

        # Now we can safely close the stream

        stream.close()

def tbz_exporter_generator(tree, dest, root, subdir,

                           force_mtime=None, fileobj=None):

    """Export this tree to a new tar file.

    `dest` will be created holding the contents of this tree; if it

    already exists, it will be clobbered, like with "tar -c".

    """

    if fileobj is not None:

        ball = tarfile.open(None, 'w|bz2', fileobj)

    elif dest == '-':

        ball = tarfile.open(None, 'w|bz2', sys.stdout)

    else:

        # tarfile.open goes on to do 'os.getcwd() + dest' for opening the

        # tar file. With dest being unicode, this throws UnicodeDecodeError

        # unless we encode dest before passing it on. This works around

        # upstream python bug http://bugs.python.org/issue8396 (fixed in

        # Python 2.6.5 and 2.7b1)

        ball = tarfile.open(dest.encode(osutils._fs_enc), 'w:bz2')

    return export_tarball_generator(

        tree, ball, root, subdir, force_mtime)

def plain_tar_exporter_generator(tree, dest, root, subdir, compression=None,

    force_mtime=None, fileobj=None):

    """Export this tree to a new tar file.

    `dest` will be created holding the contents of this tree; if it

    already exists, it will be clobbered, like with "tar -c".

    """

    if fileobj is not None:

        stream = fileobj

    elif dest == '-':

        stream = sys.stdout

    else:

        stream = open(dest, 'wb')

    ball = tarfile.open(None, 'w|', stream)

    return export_tarball_generator(

        tree, ball, root, subdir, force_mtime)

def tar_xz_exporter_generator(tree, dest, root, subdir,

                              force_mtime=None, fileobj=None):

    return tar_lzma_exporter_generator(tree, dest, root, subdir,

                                       force_mtime, fileobj, "xz")

def tar_lzma_exporter_generator(tree, dest, root, subdir,

                      force_mtime=None, fileobj=None,

                                compression_format="alone"):

    """Export this tree to a new .tar.lzma file.

    `dest` will be created holding the contents of this tree; if it

    already exists, it will be clobbered, like with "tar -c".

    """

    if dest == '-':

        raise errors.BzrError("Writing to stdout not supported for .tar.lzma")

    if fileobj is not None:

        raise errors.BzrError(

            "Writing to fileobject not supported for .tar.lzma")

    try:

        import lzma

    except ImportError, e:

        raise errors.DependencyNotPresent('lzma', e)

    stream = lzma.LZMAFile(dest.encode(osutils._fs_enc), 'w',

        options={"format": compression_format})

    ball = tarfile.open(None, 'w:', fileobj=stream)

    return export_tarball_generator(

        tree, ball, root, subdir, force_mtime=force_mtime)