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

  • Committer: Breezy landing bot
  • Author(s): Jelmer Vernooij
  • Date: 2020-07-28 02:47:10 UTC
  • mfrom: (7519.1.1 merge-3.1)
  • Revision ID: breezy.the.bot@gmail.com-20200728024710-a2ylds219f1lsl62
Merge lp:brz/3.1.

Merged from https://code.launchpad.net/~jelmer/brz/merge-3.1/+merge/388173

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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