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# Copyright (C) 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
"""Reconfigure a bzrdir into a new tree/branch/repository layout"""
from bzrlib import (
branch,
errors,
)
class Reconfigure(object):
def __init__(self, bzrdir, new_bound_location=None):
self.bzrdir = bzrdir
self.new_bound_location = new_bound_location
try:
self.repository = self.bzrdir.find_repository()
except errors.NoRepositoryPresent:
self.repository = None
try:
branch = self.bzrdir.open_branch()
if branch.bzrdir.root_transport.base == bzrdir.root_transport.base:
self.local_branch = branch
self.referenced_branch = None
else:
self.local_branch = None
self.referenced_branch = branch
except errors.NotBranchError:
self.local_branch = None
self.referenced_branch = None
try:
self.tree = bzrdir.open_workingtree()
except errors.NoWorkingTree:
self.tree = None
self._unbind = False
self._bind = False
self._destroy_reference = False
self._create_branch = False
self._destroy_tree = False
self._create_tree = False
self._create_repository = False
@staticmethod
def to_branch(bzrdir):
reconfiguration = Reconfigure(bzrdir)
reconfiguration._plan_changes(tree=False, branch=True, bound=False)
if not reconfiguration.changes_planned():
raise errors.AlreadyBranch(bzrdir)
return reconfiguration
@staticmethod
def to_tree(bzrdir):
reconfiguration = Reconfigure(bzrdir)
reconfiguration._plan_changes(tree=True, branch=True, bound=False)
if not reconfiguration.changes_planned():
raise errors.AlreadyTree(bzrdir)
return reconfiguration
@staticmethod
def to_checkout(bzrdir, bound_location=None):
reconfiguration = Reconfigure(bzrdir, bound_location)
reconfiguration._plan_changes(tree=True, branch=True, bound=True)
if not reconfiguration.changes_planned():
raise errors.AlreadyCheckout(bzrdir)
return reconfiguration
def _plan_changes(self, tree, branch, bound):
"""Determine which changes are needed to assume the configuration"""
if self.repository is None:
self._create_repository = True
if self.local_branch is None:
if branch is True:
if self.referenced_branch is not None:
self._destroy_reference = True
self._create_branch = True
if bound:
self._bind = True
else:
raise errors.ReconfigurationNotSupported(self.bzrdir)
else:
if bound:
if self.local_branch.get_bound_location() is None:
self._bind = True
else:
if self.local_branch.get_bound_location() is not None:
self._unbind = True
if not tree and self.tree is not None:
self._destroy_tree = True
if tree and self.tree is None:
self._create_tree = True
def changes_planned(self):
"""Return True if changes are planned, False otherwise"""
return (self._unbind or self._bind or self._destroy_tree
or self._create_tree or self._destroy_reference
or self._create_branch or self._create_repository)
def _check(self):
"""Raise if reconfiguration would destroy local changes"""
if self._destroy_tree:
changes = self.tree.changes_from(self.tree.basis_tree())
if changes.has_changed():
raise errors.UncommittedChanges(self.tree)
def _select_bind_location(self):
"""Select a location to bind to.
Preference is:
1. user specified location
2. branch reference location (it's a kind of bind location)
3. previous bind location (it was a good choice once)
4. push location (it's writeable, so committable)
5. parent location (it's pullable, so update-from-able)
"""
if self.new_bound_location is not None:
return self.new_bound_location
if self.local_branch is not None:
old_bound = self.local_branch.get_old_bound_location()
if old_bound is not None:
return old_bound
push_location = self.local_branch.get_push_location()
if push_location is not None:
return push_location
parent = self.local_branch.get_parent()
if parent is not None:
return parent
elif self.referenced_branch is not None:
return self.referenced_branch.base
raise errors.NoBindLocation(self.bzrdir)
def apply(self, force=False):
if not force:
self._check()
if self._create_repository:
repo = self.bzrdir.create_repository()
else:
repo = self.repository
if self._create_branch:
repo.fetch(self.referenced_branch.repository,
self.referenced_branch.last_revision())
if self._destroy_reference:
reference_info = self.referenced_branch.last_revision_info()
self.bzrdir.destroy_branch()
if self._create_branch:
local_branch = self.bzrdir.create_branch()
local_branch.set_last_revision_info(*reference_info)
else:
local_branch = self.local_branch
if self._destroy_tree:
self.bzrdir.destroy_workingtree()
if self._create_tree:
self.bzrdir.create_workingtree()
if self._unbind:
self.local_branch.unbind()
if self._bind:
bind_location = self._select_bind_location()
local_branch.bind(branch.Branch.open(bind_location))
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