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Viewing changes to breezy/plugins/weave_fmt/branch.py

  • Committer: Marius Kruger
  • Date: 2010-07-10 21:28:56 UTC
  • mto: (5384.1.1 integration)
  • mto: This revision was merged to the branch mainline in revision 5385.
  • Revision ID: marius.kruger@enerweb.co.za-20100710212856-uq4ji3go0u5se7hx
* Update documentation
* add NEWS

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breezy/plugins/weave_fmt/branch.py
1
 
# Copyright (C) 2010 Canonical Ltd
2
 
#
3
 
# This program is free software; you can redistribute it and/or modify
4
 
# it under the terms of the GNU General Public License as published by
5
 
# the Free Software Foundation; either version 2 of the License, or
6
 
# (at your option) any later version.
7
 
#
8
 
# This program is distributed in the hope that it will be useful,
9
 
# but WITHOUT ANY WARRANTY; without even the implied warranty of
10
 
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
11
 
# GNU General Public License for more details.
12
 
#
13
 
# You should have received a copy of the GNU General Public License
14
 
# along with this program; if not, write to the Free Software
15
 
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
16
 
 
17
 
"""Weave-era branch implementations."""
18
 
 
19
 
from ... import (
20
 
    errors,
21
 
    lockable_files,
22
 
    )
23
 
 
24
 
from ...decorators import (
25
 
    only_raises,
26
 
    )
27
 
from ...lock import LogicalLockResult
28
 
from ...trace import mutter
29
 
 
30
 
from ...branch import (
31
 
    BranchFormat,
32
 
    BranchWriteLockResult,
33
 
    )
34
 
from ...bzr.fullhistory import (
35
 
    FullHistoryBzrBranch,
36
 
    )
37
 
 
38
 
 
39
 
class BzrBranch4(FullHistoryBzrBranch):
40
 
    """Branch format 4."""
41
 
 
42
 
    def lock_write(self, token=None):
43
 
        """Lock the branch for write operations.
44
 
 
45
 
        :param token: A token to permit reacquiring a previously held and
46
 
            preserved lock.
47
 
        :return: A BranchWriteLockResult.
48
 
        """
49
 
        if not self.is_locked():
50
 
            self._note_lock('w')
51
 
        # All-in-one needs to always unlock/lock.
52
 
        self.repository._warn_if_deprecated(self)
53
 
        self.repository.lock_write()
54
 
        try:
55
 
            return BranchWriteLockResult(self.unlock,
56
 
                                         self.control_files.lock_write(token=token))
57
 
        except:
58
 
            self.repository.unlock()
59
 
            raise
60
 
 
61
 
    def lock_read(self):
62
 
        """Lock the branch for read operations.
63
 
 
64
 
        :return: A breezy.lock.LogicalLockResult.
65
 
        """
66
 
        if not self.is_locked():
67
 
            self._note_lock('r')
68
 
        # All-in-one needs to always unlock/lock.
69
 
        self.repository._warn_if_deprecated(self)
70
 
        self.repository.lock_read()
71
 
        try:
72
 
            self.control_files.lock_read()
73
 
            return LogicalLockResult(self.unlock)
74
 
        except:
75
 
            self.repository.unlock()
76
 
            raise
77
 
 
78
 
    @only_raises(errors.LockNotHeld, errors.LockBroken)
79
 
    def unlock(self):
80
 
        if self.control_files._lock_count == 2 and self.conf_store is not None:
81
 
            self.conf_store.save_changes()
82
 
        try:
83
 
            self.control_files.unlock()
84
 
        finally:
85
 
            # All-in-one needs to always unlock/lock.
86
 
            self.repository.unlock()
87
 
            if not self.control_files.is_locked():
88
 
                # we just released the lock
89
 
                self._clear_cached_state()
90
 
 
91
 
    def _get_checkout_format(self, lightweight=False):
92
 
        """Return the most suitable metadir for a checkout of this branch.
93
 
        """
94
 
        from .repository import RepositoryFormat7
95
 
        from ...bzr.bzrdir import BzrDirMetaFormat1
96
 
        format = BzrDirMetaFormat1()
97
 
        if lightweight:
98
 
            format.set_branch_format(self._format)
99
 
            format.repository_format = self.controldir._format.repository_format
100
 
        else:
101
 
            format.repository_format = RepositoryFormat7()
102
 
        return format
103
 
 
104
 
    def unbind(self):
105
 
        raise errors.UpgradeRequired(self.user_url)
106
 
 
107
 
    def bind(self, other):
108
 
        raise errors.UpgradeRequired(self.user_url)
109
 
 
110
 
    def set_bound_location(self, location):
111
 
        raise NotImplementedError(self.set_bound_location)
112
 
 
113
 
    def get_bound_location(self):
114
 
        return None
115
 
 
116
 
    def update(self):
117
 
        return None
118
 
 
119
 
    def get_master_branch(self, possible_transports=None):
120
 
        return None
121
 
 
122
 
 
123
 
class BzrBranchFormat4(BranchFormat):
124
 
    """Bzr branch format 4.
125
 
 
126
 
    This format has:
127
 
     - a revision-history file.
128
 
     - a branch-lock lock file [ to be shared with the bzrdir ]
129
 
 
130
 
    It does not support binding.
131
 
    """
132
 
 
133
 
    def initialize(self, a_controldir, name=None, repository=None,
134
 
                   append_revisions_only=None):
135
 
        """Create a branch of this format in a_controldir.
136
 
 
137
 
        :param a_controldir: The bzrdir to initialize the branch in
138
 
        :param name: Name of colocated branch to create, if any
139
 
        :param repository: Repository for this branch (unused)
140
 
        """
141
 
        if append_revisions_only:
142
 
            raise errors.UpgradeRequired(a_controldir.user_url)
143
 
        if repository is not None:
144
 
            raise NotImplementedError(
145
 
                "initialize(repository=<not None>) on %r" % (self,))
146
 
        if not [isinstance(a_controldir._format, format) for format in
147
 
                self._compatible_bzrdirs]:
148
 
            raise errors.IncompatibleFormat(self, a_controldir._format)
149
 
        utf8_files = [('revision-history', b''),
150
 
                      ('branch-name', b''),
151
 
                      ]
152
 
        mutter('creating branch %r in %s', self, a_controldir.user_url)
153
 
        branch_transport = a_controldir.get_branch_transport(self, name=name)
154
 
        control_files = lockable_files.LockableFiles(branch_transport,
155
 
                                                     'branch-lock', lockable_files.TransportLock)
156
 
        control_files.create_lock()
157
 
        try:
158
 
            control_files.lock_write()
159
 
        except errors.LockContention:
160
 
            lock_taken = False
161
 
        else:
162
 
            lock_taken = True
163
 
        try:
164
 
            for (filename, content) in utf8_files:
165
 
                branch_transport.put_bytes(
166
 
                    filename, content,
167
 
                    mode=a_controldir._get_file_mode())
168
 
        finally:
169
 
            if lock_taken:
170
 
                control_files.unlock()
171
 
        branch = self.open(a_controldir, name, _found=True,
172
 
                           found_repository=None)
173
 
        self._run_post_branch_init_hooks(a_controldir, name, branch)
174
 
        return branch
175
 
 
176
 
    def __init__(self):
177
 
        super(BzrBranchFormat4, self).__init__()
178
 
        from .bzrdir import (
179
 
            BzrDirFormat4, BzrDirFormat5, BzrDirFormat6,
180
 
            )
181
 
        self._matchingcontroldir = BzrDirFormat6()
182
 
        self._compatible_bzrdirs = [BzrDirFormat4, BzrDirFormat5,
183
 
                                    BzrDirFormat6]
184
 
 
185
 
    def network_name(self):
186
 
        """The network name for this format is the control dirs disk label."""
187
 
        return self._matchingcontroldir.get_format_string()
188
 
 
189
 
    def get_format_description(self):
190
 
        return "Branch format 4"
191
 
 
192
 
    def open(self, a_controldir, name=None, _found=False, ignore_fallbacks=False,
193
 
             found_repository=None, possible_transports=None):
194
 
        """See BranchFormat.open()."""
195
 
        if name is None:
196
 
            name = a_controldir._get_selected_branch()
197
 
        if name != "":
198
 
            raise errors.NoColocatedBranchSupport(self)
199
 
        if not _found:
200
 
            # we are being called directly and must probe.
201
 
            raise NotImplementedError
202
 
        if found_repository is None:
203
 
            found_repository = a_controldir.open_repository()
204
 
        return BzrBranch4(_format=self,
205
 
                          _control_files=a_controldir._control_files,
206
 
                          a_controldir=a_controldir,
207
 
                          name=name,
208
 
                          _repository=found_repository,
209
 
                          possible_transports=possible_transports)
210
 
 
211
 
    def __str__(self):
212
 
        return "Bazaar-NG branch format 4"
213
 
 
214
 
    def supports_leaving_lock(self):
215
 
        return False
216
 
 
217
 
    supports_reference_locations = False