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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
"""The core state needed to make use of bzr is managed here."""
from __future__ import absolute_import
__all__ = [
'BzrLibraryState',
]
import bzrlib
from bzrlib.lazy_import import lazy_import
lazy_import(globals(), """
from bzrlib import (
cleanup,
config,
osutils,
symbol_versioning,
trace,
ui,
)
""")
class BzrLibraryState(object):
"""The state about how bzrlib has been configured.
This is the core state needed to make use of bzr. The current instance is
currently always exposed as bzrlib.global_state, but we desired to move
to a point where no global state is needed at all.
:ivar saved_state: The bzrlib.global_state at the time __enter__ was
called.
:ivar cleanups: An ObjectWithCleanups which can be used for cleanups that
should occur when the use of bzrlib is completed. This is initialised
in __enter__ and executed in __exit__.
"""
def __init__(self, ui, trace):
"""Create library start for normal use of bzrlib.
Most applications that embed bzrlib, including bzr itself, should just
call bzrlib.initialize(), but it is possible to use the state class
directly. The initialize() function provides sensible defaults for a
CLI program, such as a text UI factory.
More options may be added in future so callers should use named
arguments.
BzrLibraryState implements the Python 2.5 Context Manager protocol
PEP343, and can be used with the with statement. Upon __enter__ the
global variables in use by bzr are set, and they are cleared on
__exit__.
:param ui: A bzrlib.ui.ui_factory to use.
:param trace: A bzrlib.trace.Config context manager to use, perhaps
bzrlib.trace.DefaultConfig.
"""
self._ui = ui
self._trace = trace
# There is no overrides by default, they are set later when the command
# arguments are parsed.
self.cmdline_overrides = config.CommandLineStore()
self.started = False
def __enter__(self):
if not self.started:
self._start()
return self # This is bound to the 'as' clause in a with statement.
def _start(self):
"""Do all initialization."""
# NB: This function tweaks so much global state it's hard to test it in
# isolation within the same interpreter. It's not reached on normal
# in-process run_bzr calls. If it's broken, we expect that
# TestRunBzrSubprocess may fail.
self.cleanups = cleanup.ObjectWithCleanups()
if bzrlib.version_info[3] == 'final':
self.cleanups.add_cleanup(
symbol_versioning.suppress_deprecation_warnings(override=True))
self._trace.__enter__()
self._orig_ui = bzrlib.ui.ui_factory
bzrlib.ui.ui_factory = self._ui
self._ui.__enter__()
self.saved_state = bzrlib.global_state
bzrlib.global_state = self
self.started = True
def __exit__(self, exc_type, exc_val, exc_tb):
self.cleanups.cleanup_now()
trace._flush_stdout_stderr()
trace._flush_trace()
osutils.report_extension_load_failures()
self._ui.__exit__(None, None, None)
self._trace.__exit__(None, None, None)
ui.ui_factory = self._orig_ui
bzrlib.global_state = self.saved_state
return False # propogate exceptions.
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