~bzr-pqm/bzr/bzr.dev

# Copyright (C) 2004, 2005 by 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

# TODO: This could be done *much* more efficiently by just copying

# all the whole weaves and revisions, rather than getting one

# revision at a time.

import os

import sys

from bzrlib.merge import build_working_dir

from bzrlib.branch import Branch

from bzrlib.trace import mutter

# TODO: Optionally, after copying, discard any irrelevant information from

# the destination - e.g. 

def copy_branch(branch_from, to_location, revision=None, basis_branch=None):

    """Copy branch_from into the existing directory to_location.

    revision

        If not None, only revisions up to this point will be copied.

        The head of the new branch will be that revision.  Must be a

        revid or None.

    to_location -- The destination directory; must either exist and be 

        empty, or not exist, in which case it is created.

    revno

        The revision to copy up to

    basis_branch

        A local branch to copy revisions from, related to branch_from. 

        This is used when branching from a remote (slow) branch, and we have

        a local branch that might contain some relevant revisions.

    """

    assert isinstance(branch_from, Branch)

    assert isinstance(to_location, basestring)

    if not os.path.exists(to_location):

        os.mkdir(to_location)

    br_to = Branch.initialize(to_location)

    mutter("copy branch from %s to %s", branch_from, br_to)

    if basis_branch is not None:

        basis_branch.push_stores(br_to)

    br_to.set_root_id(branch_from.get_root_id())

    if revision is None:

        revision = branch_from.last_revision()

    br_to.update_revisions(branch_from, stop_revision=revision)

    build_working_dir(to_location)

    br_to.set_parent(branch_from.base)

    mutter("copied")

    return br_to