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# Copyright (C) 2010 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
"""Weave-era branch implementations."""
from __future__ import absolute_import
from bzrlib import (
errors,
lockable_files,
)
from bzrlib.decorators import (
needs_read_lock,
needs_write_lock,
only_raises,
)
from bzrlib.lock import LogicalLockResult
from bzrlib.trace import mutter
from bzrlib.branch import (
BranchFormat,
BranchWriteLockResult,
)
from bzrlib.branchfmt.fullhistory import (
FullHistoryBzrBranch,
)
class BzrBranch4(FullHistoryBzrBranch):
"""Branch format 4."""
def lock_write(self, token=None):
"""Lock the branch for write operations.
:param token: A token to permit reacquiring a previously held and
preserved lock.
:return: A BranchWriteLockResult.
"""
if not self.is_locked():
self._note_lock('w')
# All-in-one needs to always unlock/lock.
self.repository._warn_if_deprecated(self)
self.repository.lock_write()
try:
return BranchWriteLockResult(self.unlock,
self.control_files.lock_write(token=token))
except:
self.repository.unlock()
raise
def lock_read(self):
"""Lock the branch for read operations.
:return: A bzrlib.lock.LogicalLockResult.
"""
if not self.is_locked():
self._note_lock('r')
# All-in-one needs to always unlock/lock.
self.repository._warn_if_deprecated(self)
self.repository.lock_read()
try:
self.control_files.lock_read()
return LogicalLockResult(self.unlock)
except:
self.repository.unlock()
raise
@only_raises(errors.LockNotHeld, errors.LockBroken)
def unlock(self):
if self.control_files._lock_count == 2 and self.conf_store is not None:
self.conf_store.save_changes()
try:
self.control_files.unlock()
finally:
# All-in-one needs to always unlock/lock.
self.repository.unlock()
if not self.control_files.is_locked():
# we just released the lock
self._clear_cached_state()
def _get_checkout_format(self, lightweight=False):
"""Return the most suitable metadir for a checkout of this branch.
"""
from bzrlib.plugins.weave_fmt.repository import RepositoryFormat7
from bzrlib.bzrdir import BzrDirMetaFormat1
format = BzrDirMetaFormat1()
if lightweight:
format.set_branch_format(self._format)
format.repository_format = self.bzrdir._format.repository_format
else:
format.repository_format = RepositoryFormat7()
return format
def unbind(self):
raise errors.UpgradeRequired(self.user_url)
def bind(self, other):
raise errors.UpgradeRequired(self.user_url)
def set_bound_location(self, location):
raise NotImplementedError(self.set_bound_location)
def get_bound_location(self):
return None
def update(self):
return None
def get_master_branch(self, possible_transports=None):
return None
class BzrBranchFormat4(BranchFormat):
"""Bzr branch format 4.
This format has:
- a revision-history file.
- a branch-lock lock file [ to be shared with the bzrdir ]
It does not support binding.
"""
def initialize(self, a_bzrdir, name=None, repository=None,
append_revisions_only=None):
"""Create a branch of this format in a_bzrdir.
:param a_bzrdir: The bzrdir to initialize the branch in
:param name: Name of colocated branch to create, if any
:param repository: Repository for this branch (unused)
"""
if append_revisions_only:
raise errors.UpgradeRequired(a_bzrdir.user_url)
if repository is not None:
raise NotImplementedError(
"initialize(repository=<not None>) on %r" % (self,))
if not [isinstance(a_bzrdir._format, format) for format in
self._compatible_bzrdirs]:
raise errors.IncompatibleFormat(self, a_bzrdir._format)
utf8_files = [('revision-history', ''),
('branch-name', ''),
]
mutter('creating branch %r in %s', self, a_bzrdir.user_url)
branch_transport = a_bzrdir.get_branch_transport(self, name=name)
control_files = lockable_files.LockableFiles(branch_transport,
'branch-lock', lockable_files.TransportLock)
control_files.create_lock()
try:
control_files.lock_write()
except errors.LockContention:
lock_taken = False
else:
lock_taken = True
try:
for (filename, content) in utf8_files:
branch_transport.put_bytes(
filename, content,
mode=a_bzrdir._get_file_mode())
finally:
if lock_taken:
control_files.unlock()
branch = self.open(a_bzrdir, name, _found=True,
found_repository=None)
self._run_post_branch_init_hooks(a_bzrdir, name, branch)
return branch
def __init__(self):
super(BzrBranchFormat4, self).__init__()
from bzrlib.plugins.weave_fmt.bzrdir import (
BzrDirFormat4, BzrDirFormat5, BzrDirFormat6,
)
self._matchingbzrdir = BzrDirFormat6()
self._compatible_bzrdirs = [BzrDirFormat4, BzrDirFormat5,
BzrDirFormat6]
def network_name(self):
"""The network name for this format is the control dirs disk label."""
return self._matchingbzrdir.get_format_string()
def get_format_description(self):
return "Branch format 4"
def open(self, a_bzrdir, name=None, _found=False, ignore_fallbacks=False,
found_repository=None, possible_transports=None):
"""See BranchFormat.open()."""
if name is None:
name = a_bzrdir._get_selected_branch()
if name != "":
raise errors.NoColocatedBranchSupport(self)
if not _found:
# we are being called directly and must probe.
raise NotImplementedError
if found_repository is None:
found_repository = a_bzrdir.open_repository()
return BzrBranch4(_format=self,
_control_files=a_bzrdir._control_files,
a_bzrdir=a_bzrdir,
name=name,
_repository=found_repository,
possible_transports=possible_transports)
def __str__(self):
return "Bazaar-NG branch format 4"
def supports_leaving_lock(self):
return False
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