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# Copyright (C) 2006, 2007 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
# Original author: David Allouche
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):
"""Switch the branch associated with a checkout.
:param control_dir: BzrDir of the checkout to change
:param to_branch: branch that the checkout is to reference
"""
_check_switch_branch_format(control_dir)
_check_pending_merges(control_dir)
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)
def _check_switch_branch_format(control):
"""Check that the branch format supports the switch operation.
Note: Only lightweight checkouts are currently supported.
This may change in the future though.
:param control: BzrDir of the branch to check
"""
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 lightweight 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 _check_pending_merges(control):
"""Check that there are no outstanding pending merges before switching.
:param control: BzrDir of the branch to check
"""
try:
tree = control.open_workingtree()
except errors.NotBranchError:
# old branch is gone
return
# XXX: Should the tree be locked for get_parent_ids?
existing_pending_merges = tree.get_parent_ids()[1:]
if len(existing_pending_merges) > 0:
raise errors.BzrCommandError('Pending merges must be '
'committed or reverted before using switch.')
def _set_branch_location(control, to_branch):
"""Set location value of a branch reference.
:param control: BzrDir of the checkout to change
:param to_branch: branch that the checkout is to reference
"""
transport = control.get_branch_transport(None)
location = transport.put_bytes('location', to_branch.base)
def _update(tree, source_repository):
"""Update a working tree to the latest revision of its branch.
:param tree: the working tree
:param source_repository: repository holding the revisions
"""
tree.lock_tree_write()
try:
to_branch = tree.branch
if tree.last_revision() == to_branch.last_revision():
note("Tree is up to date at revision %d.", to_branch.revno())
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.' % to_branch.revno())
finally:
tree.unlock()
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