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  • Committer: Aaron Bentley
  • Date: 2007-09-14 13:58:32 UTC
  • mto: This revision was merged to the branch mainline in revision 2826.
  • Revision ID: abentley@panoramicfeedback.com-20070914135832-pav71k9dtjl7fcto
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bzrlib/reconfigure.py
 
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# Copyright (C) 2007 Canonical Ltd
 
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#
 
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# This program is free software; you can redistribute it and/or modify
 
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# it under the terms of the GNU General Public License as published by
 
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# the Free Software Foundation; either version 2 of the License, or
 
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# (at your option) any later version.
 
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#
 
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# This program is distributed in the hope that it will be useful,
 
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
 
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 
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# GNU General Public License for more details.
 
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#
 
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# You should have received a copy of the GNU General Public License
 
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# along with this program; if not, write to the Free Software
 
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 
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"""Reconfigure a bzrdir into a new tree/branch/repository layout"""
 
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from bzrlib import (
 
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    branch,
 
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    errors,
 
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    )
 
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class Reconfigure(object):
 
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    def __init__(self, bzrdir, new_bound_location=None):
 
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        self.bzrdir = bzrdir
 
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        self.new_bound_location = new_bound_location
 
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        try:
 
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            self.repository = self.bzrdir.find_repository()
 
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        except errors.NoRepositoryPresent:
 
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            self.repository = None
 
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        try:
 
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            branch = self.bzrdir.open_branch()
 
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            if branch.bzrdir.root_transport.base == bzrdir.root_transport.base:
 
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                self.local_branch = branch
 
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                self.referenced_branch = None
 
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            else:
 
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                self.local_branch = None
 
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                self.referenced_branch = branch
 
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        except errors.NotBranchError:
 
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            self.local_branch = None
 
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            self.referenced_branch = None
 
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        try:
 
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            self.tree = bzrdir.open_workingtree()
 
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        except errors.NoWorkingTree:
 
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            self.tree = None
 
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        self._unbind = False
 
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        self._bind = False
 
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        self._destroy_reference = False
 
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        self._create_branch = False
 
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        self._destroy_tree = False
 
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        self._create_tree = False
 
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        self._create_repository = False
 
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    @staticmethod
 
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    def to_branch(bzrdir):
 
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        reconfiguration = Reconfigure(bzrdir)
 
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        reconfiguration._plan_changes(tree=False, branch=True, bound=False)
 
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        if not reconfiguration.changes_planned():
 
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            raise errors.AlreadyBranch(bzrdir)
 
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        return reconfiguration
 
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    @staticmethod
 
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    def to_tree(bzrdir):
 
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        reconfiguration = Reconfigure(bzrdir)
 
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        reconfiguration._plan_changes(tree=True, branch=True, bound=False)
 
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        if not reconfiguration.changes_planned():
 
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            raise errors.AlreadyTree(bzrdir)
 
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        return reconfiguration
 
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    @staticmethod
 
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    def to_checkout(bzrdir, bound_location=None):
 
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        reconfiguration = Reconfigure(bzrdir, bound_location)
 
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        reconfiguration._plan_changes(tree=True, branch=True, bound=True)
 
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        if not reconfiguration.changes_planned():
 
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            raise errors.AlreadyCheckout(bzrdir)
 
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        return reconfiguration
 
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    def _plan_changes(self, tree, branch, bound):
 
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        """Determine which changes are needed to assume the configuration"""
 
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        if self.repository is None:
 
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            self._create_repository = True
 
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        if self.local_branch is None:
 
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            if branch is True:
 
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                if self.referenced_branch is not None:
 
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                    self._destroy_reference = True
 
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                    self._create_branch = True
 
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                    if bound:
 
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                        self._bind = True
 
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                else:
 
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                    raise errors.ReconfigurationNotSupported(self.bzrdir)
 
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        else:
 
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            if bound:
 
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                if self.local_branch.get_bound_location() is None:
 
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                    self._bind = True
 
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            else:
 
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                if self.local_branch.get_bound_location() is not None:
 
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                    self._unbind = True
 
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        if not tree and self.tree is not None:
 
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            self._destroy_tree = True
 
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        if tree and self.tree is None:
 
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            self._create_tree = True
 
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    def changes_planned(self):
 
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        """Return True if changes are planned, False otherwise"""
 
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        return (self._unbind or self._bind or self._destroy_tree
 
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                or self._create_tree or self._destroy_reference
 
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                or self._create_branch or self._create_repository)
 
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    def _check(self):
 
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        """Raise if reconfiguration would destroy local changes"""
 
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        if self._destroy_tree:
 
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            changes = self.tree.changes_from(self.tree.basis_tree())
 
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            if changes.has_changed():
 
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                raise errors.UncommittedChanges(self.tree)
 
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    def _select_bind_location(self):
 
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        """Select a location to bind to.
 
120
 
 
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        Preference is:
 
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        1. user specified location
 
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        2. branch reference location (it's a kind of bind location)
 
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        3. previous bind location (it was a good choice once)
 
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        4. push location (it's writeable, so committable)
 
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        5. parent location (it's pullable, so update-from-able)
 
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        """
 
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        if self.new_bound_location is not None:
 
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            return self.new_bound_location
 
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        if self.local_branch is not None:
 
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            old_bound = self.local_branch.get_old_bound_location()
 
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            if old_bound is not None:
 
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                return old_bound
 
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            push_location = self.local_branch.get_push_location()
 
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            if push_location is not None:
 
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                return push_location
 
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            parent = self.local_branch.get_parent()
 
138
            if parent is not None:
 
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                return parent
 
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        elif self.referenced_branch is not None:
 
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            return self.referenced_branch.base
 
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        raise errors.NoBindLocation(self.bzrdir)
 
143
 
 
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    def apply(self, force=False):
 
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        if not force:
 
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            self._check()
 
147
        if self._create_repository:
 
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            repo = self.bzrdir.create_repository()
 
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        else:
 
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            repo = self.repository
 
151
        if self._create_branch:
 
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            repo.fetch(self.referenced_branch.repository,
 
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                       self.referenced_branch.last_revision())
 
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        if self._destroy_reference:
 
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            reference_info = self.referenced_branch.last_revision_info()
 
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            self.bzrdir.destroy_branch()
 
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        if self._create_branch:
 
158
            local_branch = self.bzrdir.create_branch()
 
159
            local_branch.set_last_revision_info(*reference_info)
 
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        else:
 
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            local_branch = self.local_branch
 
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        if self._destroy_tree:
 
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            self.bzrdir.destroy_workingtree()
 
164
        if self._create_tree:
 
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            self.bzrdir.create_workingtree()
 
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        if self._unbind:
 
167
            self.local_branch.unbind()
 
168
        if self._bind:
 
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            bind_location = self._select_bind_location()
 
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            local_branch.bind(branch.Branch.open(bind_location))