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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, revision
from bzrlib.branch import Branch, BranchFormat, BranchReferenceFormat
from bzrlib.bzrdir import BzrDir
from bzrlib.trace import note
def switch(control_dir, to_branch, force=False):
"""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
:param force: skip the check for local commits in a heavy checkout
"""
_check_pending_merges(control_dir, force)
try:
source_repository = control_dir.open_branch().repository
except errors.NotBranchError:
source_repository = to_branch.repository
_set_branch_location(control_dir, to_branch, force)
tree = control_dir.open_workingtree()
_update(tree, source_repository)
def _check_pending_merges(control, force=False):
"""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, ex:
# Lightweight checkout and branch is no longer there
if force:
return
else:
raise ex
# 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, force=False):
"""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
:param force: skip the check for local commits in a heavy checkout
"""
branch_format = control.find_branch_format()
if branch_format.get_reference(control) is not None:
# Lightweight checkout: update the branch reference
branch_format.set_reference(control, to_branch)
else:
b = control.open_branch()
bound_branch = b.get_bound_location()
if bound_branch is not None:
# Heavyweight checkout: check all local commits
# have been pushed to the current bound branch then
# synchronise the local branch with the new remote branch
# and bind to it
possible_transports = []
if not force and _any_local_commits(b, possible_transports):
raise errors.BzrCommandError(
'Cannot switch as local commits found in the checkout. '
'Commit these to the bound branch or use --force to '
'throw them away.')
b.set_bound_location(None)
b.pull(to_branch, overwrite=True,
possible_transports=possible_transports)
b.set_bound_location(to_branch.base)
else:
raise errors.BzrCommandError('Cannot switch a branch, '
'only a checkout.')
def _any_local_commits(this_branch, possible_transports):
"""Does this branch have any commits not in the master branch?"""
last_rev = revision.ensure_null(this_branch.last_revision())
if last_rev != revision.NULL_REVISION:
other_branch = this_branch.get_master_branch(possible_transports)
this_branch.lock_read()
other_branch.lock_read()
try:
other_last_rev = other_branch.last_revision()
graph = this_branch.repository.get_graph(
other_branch.repository)
if not graph.is_ancestor(last_rev, other_last_rev):
return True
finally:
other_branch.unlock()
this_branch.unlock()
return False
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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