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

  • Committer: John Arbash Meinel
  • Date: 2013-05-23 10:04:17 UTC
  • mfrom: (6437.63.11 2.5)
  • mto: This revision was merged to the branch mainline in revision 6575.
  • Revision ID: john@arbash-meinel.com-20130523100417-i38zikta14q2xdyz
Merge lp:bzr/2.5 tip and move up the changelog items.

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bzrlib/plugins/weave_fmt/branch.py
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"""Weave-era branch implementations."""
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from __future__ import absolute_import
 
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from bzrlib import (
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    errors,
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    lockable_files,
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    )
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from bzrlib.decorators import (
 
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    needs_read_lock,
 
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    needs_write_lock,
 
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    only_raises,
 
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    )
 
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from bzrlib.lock import LogicalLockResult
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from bzrlib.trace import mutter
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from bzrlib.branch import (
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    BranchFormat,
 
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    BranchWriteLockResult,
 
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    )
 
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from bzrlib.branchfmt.fullhistory import (
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    FullHistoryBzrBranch,
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    )
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class BzrBranch4(FullHistoryBzrBranch):
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    """Branch format 4."""
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    def lock_write(self, token=None):
 
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        """Lock the branch for write operations.
 
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        :param token: A token to permit reacquiring a previously held and
 
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            preserved lock.
 
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        :return: A BranchWriteLockResult.
 
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        """
 
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        if not self.is_locked():
 
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            self._note_lock('w')
 
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        # All-in-one needs to always unlock/lock.
 
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        self.repository._warn_if_deprecated(self)
 
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        self.repository.lock_write()
 
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        try:
 
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            return BranchWriteLockResult(self.unlock,
 
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                self.control_files.lock_write(token=token))
 
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        except:
 
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            self.repository.unlock()
 
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            raise
 
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    def lock_read(self):
 
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        """Lock the branch for read operations.
 
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        :return: A bzrlib.lock.LogicalLockResult.
 
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        """
 
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        if not self.is_locked():
 
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            self._note_lock('r')
 
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        # All-in-one needs to always unlock/lock.
 
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        self.repository._warn_if_deprecated(self)
 
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        self.repository.lock_read()
 
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        try:
 
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            self.control_files.lock_read()
 
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            return LogicalLockResult(self.unlock)
 
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        except:
 
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            self.repository.unlock()
 
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            raise
 
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    @only_raises(errors.LockNotHeld, errors.LockBroken)
 
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    def unlock(self):
 
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        if self.control_files._lock_count == 2 and self.conf_store is not None:
 
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            self.conf_store.save_changes()
 
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        try:
 
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            self.control_files.unlock()
 
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        finally:
 
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            # All-in-one needs to always unlock/lock.
 
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            self.repository.unlock()
 
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            if not self.control_files.is_locked():
 
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                # we just released the lock
 
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                self._clear_cached_state()
 
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    def _get_checkout_format(self, lightweight=False):
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        """Return the most suitable metadir for a checkout of this branch.
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        """
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        return "Branch format 4"
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    def open(self, a_bzrdir, name=None, _found=False, ignore_fallbacks=False,
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            found_repository=None):
 
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            found_repository=None, possible_transports=None):
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        """See BranchFormat.open()."""
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        if name is not None:
 
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        if name is None:
 
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            name = a_bzrdir._get_selected_branch()
 
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        if name != "":
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            raise errors.NoColocatedBranchSupport(self)
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        if not _found:
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            # we are being called directly and must probe.
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                         _control_files=a_bzrdir._control_files,
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                         a_bzrdir=a_bzrdir,
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                         name=name,
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                         _repository=found_repository)
 
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                         _repository=found_repository,
 
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                         possible_transports=possible_transports)
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    def __str__(self):
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        return "Bazaar-NG branch format 4"