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  • Committer: Canonical.com Patch Queue Manager
  • Date: 2008-04-07 07:52:50 UTC
  • mfrom: (3340.1.1 208418-1.4)
  • Revision ID: pqm@pqm.ubuntu.com-20080407075250-phs53xnslo8boaeo
Return the correct knit serialisation method in _StreamAccess.
        (Andrew Bennetts, Martin Pool, Robert Collins)

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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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    )
 
23
 
 
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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_reference = False
 
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        self._destroy_branch = 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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        self._destroy_repository = False
 
58
 
 
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    @staticmethod
 
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    def to_branch(bzrdir):
 
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        """Return a Reconfiguration to convert this bzrdir into a branch
 
62
 
 
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        :param bzrdir: The bzrdir to reconfigure
 
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        :raise errors.AlreadyBranch: if bzrdir is already a branch
 
65
        """
 
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        reconfiguration = Reconfigure(bzrdir)
 
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        reconfiguration._plan_changes(want_tree=False, want_branch=True,
 
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                                      want_bound=False, want_reference=False)
 
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        if not reconfiguration.changes_planned():
 
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            raise errors.AlreadyBranch(bzrdir)
 
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        return reconfiguration
 
72
 
 
73
    @staticmethod
 
74
    def to_tree(bzrdir):
 
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        """Return a Reconfiguration to convert this bzrdir into a tree
 
76
 
 
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        :param bzrdir: The bzrdir to reconfigure
 
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        :raise errors.AlreadyTree: if bzrdir is already a tree
 
79
        """
 
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        reconfiguration = Reconfigure(bzrdir)
 
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        reconfiguration._plan_changes(want_tree=True, want_branch=True,
 
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                                      want_bound=False, want_reference=False)
 
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        if not reconfiguration.changes_planned():
 
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            raise errors.AlreadyTree(bzrdir)
 
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        return reconfiguration
 
86
 
 
87
    @staticmethod
 
88
    def to_checkout(bzrdir, bound_location=None):
 
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        """Return a Reconfiguration to convert this bzrdir into a checkout
 
90
 
 
91
        :param bzrdir: The bzrdir to reconfigure
 
92
        :param bound_location: The location the checkout should be bound to.
 
93
        :raise errors.AlreadyCheckout: if bzrdir is already a checkout
 
94
        """
 
95
        reconfiguration = Reconfigure(bzrdir, bound_location)
 
96
        reconfiguration._plan_changes(want_tree=True, want_branch=True,
 
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                                      want_bound=True, want_reference=False)
 
98
        if not reconfiguration.changes_planned():
 
99
            raise errors.AlreadyCheckout(bzrdir)
 
100
        return reconfiguration
 
101
 
 
102
    @classmethod
 
103
    def to_lightweight_checkout(klass, bzrdir, reference_location=None):
 
104
        """Make a Reconfiguration to convert bzrdir into a lightweight checkout
 
105
 
 
106
        :param bzrdir: The bzrdir to reconfigure
 
107
        :param bound_location: The location the checkout should be bound to.
 
108
        :raise errors.AlreadyLightweightCheckout: if bzrdir is already a
 
109
            lightweight checkout
 
110
        """
 
111
        reconfiguration = klass(bzrdir, reference_location)
 
112
        reconfiguration._plan_changes(want_tree=True, want_branch=False,
 
113
                                      want_bound=False, want_reference=True)
 
114
        if not reconfiguration.changes_planned():
 
115
            raise errors.AlreadyLightweightCheckout(bzrdir)
 
116
        return reconfiguration
 
117
 
 
118
    def _plan_changes(self, want_tree, want_branch, want_bound,
 
119
                      want_reference):
 
120
        """Determine which changes are needed to assume the configuration"""
 
121
        if not want_branch and not want_reference:
 
122
            raise errors.ReconfigurationNotSupported(self.bzrdir)
 
123
        if want_branch and want_reference:
 
124
            raise errors.ReconfigurationNotSupported(self.bzrdir)
 
125
        if self.repository is None:
 
126
            if not want_reference:
 
127
                self._create_repository = True
 
128
        else:
 
129
            if want_reference and (self.repository.bzrdir.root_transport.base
 
130
                                   == self.bzrdir.root_transport.base):
 
131
                if not self.repository.is_shared():
 
132
                    self._destroy_repository = True
 
133
        if self.referenced_branch is None:
 
134
            if want_reference:
 
135
                self._create_reference = True
 
136
                if self.local_branch is not None:
 
137
                    self._destroy_branch = True
 
138
        else:
 
139
            if not want_reference:
 
140
                self._destroy_reference = True
 
141
        if self.local_branch is None:
 
142
            if want_branch is True:
 
143
                self._create_branch = True
 
144
                if want_bound:
 
145
                    self._bind = True
 
146
        else:
 
147
            if want_bound:
 
148
                if self.local_branch.get_bound_location() is None:
 
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                    self._bind = True
 
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            else:
 
151
                if self.local_branch.get_bound_location() is not None:
 
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                    self._unbind = True
 
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        if not want_tree and self.tree is not None:
 
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            self._destroy_tree = True
 
155
        if want_tree and self.tree is None:
 
156
            self._create_tree = True
 
157
 
 
158
    def changes_planned(self):
 
159
        """Return True if changes are planned, False otherwise"""
 
160
        return (self._unbind or self._bind or self._destroy_tree
 
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                or self._create_tree or self._destroy_reference
 
162
                or self._create_branch or self._create_repository
 
163
                or self._create_reference)
 
164
 
 
165
    def _check(self):
 
166
        """Raise if reconfiguration would destroy local changes"""
 
167
        if self._destroy_tree:
 
168
            changes = self.tree.changes_from(self.tree.basis_tree())
 
169
            if changes.has_changed():
 
170
                raise errors.UncommittedChanges(self.tree)
 
171
 
 
172
    def _select_bind_location(self):
 
173
        """Select a location to bind or create a reference to.
 
174
 
 
175
        Preference is:
 
176
        1. user specified location
 
177
        2. branch reference location (it's a kind of bind location)
 
178
        3. current bind location
 
179
        4. previous bind location (it was a good choice once)
 
180
        5. push location (it's writeable, so committable)
 
181
        6. parent location (it's pullable, so update-from-able)
 
182
        """
 
183
        if self.new_bound_location is not None:
 
184
            return self.new_bound_location
 
185
        if self.local_branch is not None:
 
186
            bound = self.local_branch.get_bound_location()
 
187
            if bound is not None:
 
188
                return bound
 
189
            old_bound = self.local_branch.get_old_bound_location()
 
190
            if old_bound is not None:
 
191
                return old_bound
 
192
            push_location = self.local_branch.get_push_location()
 
193
            if push_location is not None:
 
194
                return push_location
 
195
            parent = self.local_branch.get_parent()
 
196
            if parent is not None:
 
197
                return parent
 
198
        elif self.referenced_branch is not None:
 
199
            return self.referenced_branch.base
 
200
        raise errors.NoBindLocation(self.bzrdir)
 
201
 
 
202
    def apply(self, force=False):
 
203
        """Apply the reconfiguration
 
204
 
 
205
        :param force: If true, the reconfiguration is applied even if it will
 
206
            destroy local changes.
 
207
        :raise errors.UncommittedChanges: if the local tree is to be destroyed
 
208
            but contains uncommitted changes.
 
209
        :raise errors.NoBindLocation: if no bind location was specified and
 
210
            none could be autodetected.
 
211
        """
 
212
        if not force:
 
213
            self._check()
 
214
        if self._create_repository:
 
215
            repo = self.bzrdir.create_repository()
 
216
        else:
 
217
            repo = self.repository
 
218
        if self._create_branch and self.referenced_branch is not None:
 
219
            repo.fetch(self.referenced_branch.repository,
 
220
                       self.referenced_branch.last_revision())
 
221
        if self._create_reference:
 
222
            reference_branch = branch.Branch.open(self._select_bind_location())
 
223
        if self._destroy_repository:
 
224
            if self._create_reference:
 
225
                reference_branch.repository.fetch(self.repository)
 
226
        last_revision_info = None
 
227
        if self._destroy_reference:
 
228
            last_revision_info = self.referenced_branch.last_revision_info()
 
229
            self.bzrdir.destroy_branch()
 
230
        if self._destroy_branch:
 
231
            last_revision_info = self.local_branch.last_revision_info()
 
232
            if self._create_reference:
 
233
                self.local_branch.tags.merge_to(reference_branch.tags)
 
234
            self.bzrdir.destroy_branch()
 
235
        if self._create_branch:
 
236
            local_branch = self.bzrdir.create_branch()
 
237
            if last_revision_info is not None:
 
238
                local_branch.set_last_revision_info(*last_revision_info)
 
239
            if self._destroy_reference:
 
240
                self.referenced_branch.tags.merge_to(local_branch.tags)
 
241
        else:
 
242
            local_branch = self.local_branch
 
243
        if self._create_reference:
 
244
            format = branch.BranchReferenceFormat().initialize(self.bzrdir,
 
245
                reference_branch)
 
246
        if self._destroy_tree:
 
247
            self.bzrdir.destroy_workingtree()
 
248
        if self._create_tree:
 
249
            self.bzrdir.create_workingtree()
 
250
        if self._unbind:
 
251
            self.local_branch.unbind()
 
252
        if self._bind:
 
253
            bind_location = self._select_bind_location()
 
254
            local_branch.bind(branch.Branch.open(bind_location))
 
255
        if self._destroy_repository:
 
256
            self.bzrdir.destroy_repository()