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# Copyright (C) 2007, 2009, 2010 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
from __future__ import absolute_import
# Original author: David Allouche
from bzrlib import errors, merge, revision
from bzrlib.branch import Branch
from bzrlib.i18n import gettext
from bzrlib.trace import note
def _run_post_switch_hooks(control_dir, to_branch, force, revision_id):
from bzrlib.branch import SwitchHookParams
hooks = Branch.hooks['post_switch']
if not hooks:
return
params = SwitchHookParams(control_dir, to_branch, force, revision_id)
for hook in hooks:
hook(params)
def switch(control_dir, to_branch, force=False, quiet=False, revision_id=None):
"""Switch the branch associated with a checkout.
:param control_dir: ControlDir 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
:param revision_id: revision ID to switch to.
"""
_check_pending_merges(control_dir, force)
try:
source_repository = control_dir.open_branch().repository
except errors.NotBranchError:
source_repository = to_branch.repository
to_branch.lock_read()
try:
_set_branch_location(control_dir, to_branch, force)
finally:
to_branch.unlock()
tree = control_dir.open_workingtree()
_update(tree, source_repository, quiet, revision_id)
_run_post_switch_hooks(control_dir, to_branch, force, revision_id)
def _check_pending_merges(control, force=False):
"""Check that there are no outstanding pending merges before switching.
:param control: ControlDir 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(gettext('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: ControlDir 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, None, 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 = []
try:
if not force and _any_local_commits(b, possible_transports):
raise errors.BzrCommandError(gettext(
'Cannot switch as local commits found in the checkout. '
'Commit these to the bound branch or use --force to '
'throw them away.'))
except errors.BoundBranchConnectionFailure, e:
raise errors.BzrCommandError(gettext(
'Unable to connect to current master branch %(target)s: '
'%(error)s To switch anyway, use --force.') %
e.__dict__)
b.set_bound_location(None)
b.pull(to_branch, overwrite=True,
possible_transports=possible_transports)
b.set_bound_location(to_branch.base)
b.set_parent(b.get_master_branch().get_parent())
else:
# If this is a standalone tree and the new branch
# is derived from this one, create a lightweight checkout.
b.lock_read()
try:
graph = b.repository.get_graph(to_branch.repository)
if (b.bzrdir._format.colocated_branches and
(force or graph.is_ancestor(b.last_revision(),
to_branch.last_revision()))):
b.bzrdir.destroy_branch()
b.bzrdir.set_branch_reference(to_branch, name="")
else:
raise errors.BzrCommandError(gettext('Cannot switch a branch, '
'only a checkout.'))
finally:
b.unlock()
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, quiet=False, revision_id=None):
"""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 revision_id is None:
revision_id = to_branch.last_revision()
if tree.last_revision() == revision_id:
if not quiet:
note(gettext("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.repository.revision_tree(revision_id))
tree.set_last_revision(to_branch.last_revision())
if not quiet:
note(gettext('Updated to revision %d.') % to_branch.revno())
finally:
tree.unlock()
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