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# Copyright (C) 2006 Canonical Limited.
# Copyright (C) 2007 Aaron Bentley
# Authors: David Allouche <david@allouche.net>
# Aaron Bentley <aaron.bentley@utoronto.ca>
#
# 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
from bzrlib import errors, merge
from bzrlib.branch import Branch, BranchFormat, BranchReferenceFormat
from bzrlib.bzrdir import BzrDir
from bzrlib.trace import note
def switch(control_dir, to_branch):
try:
source_repository = control_dir.open_branch().repository
except errors.NotBranchError:
source_repository = to_branch.repository
set_branch_location(control_dir, to_branch)
tree = control_dir.open_workingtree()
_update(tree, source_repository, to_branch)
def _update(tree, source_repository, to_branch):
tree.lock_tree_write()
try:
if tree.last_revision() == tree.branch.last_revision():
note("Tree is up to date.")
return
base_tree = source_repository.revision_tree(tree.last_revision())
merge.Merge3Merger(tree, tree, base_tree, to_branch.basis_tree())
tree.set_last_revision(to_branch.last_revision())
note('Updated to revision %d' % tree.branch.revno())
finally:
tree.unlock()
def _check_switch_branch_format(control):
branch_format = BranchFormat.find_format(control)
format_string = branch_format.get_format_string()
if not format_string.startswith("Bazaar-NG Branch Reference Format "):
raise errors.BzrCommandError(
'The switch command can only be used on a light checkout.\n'
'Expected branch reference, found %s at %s' % (
format_string.strip(), control.root_transport.base))
if not format_string == BranchReferenceFormat().get_format_string():
raise errors.BzrCommandError(
'Unsupported: %r' % (format_string.strip(),))
def set_branch_location(control, to_branch):
"""Set location value of a branch reference.
:param control: BzrDir containing the branch reference
:param location: value to write to the branch reference location.
"""
_check_switch_branch_format(control)
branch_format = BranchFormat.find_format(control)
transport = control.get_branch_transport(None)
location = transport.put_bytes('location', to_branch.base)
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