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# Copyright (C) 2005, 2006, 2007, 2008 Canonical Ltd
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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"""Messages and logging for bazaar-ng.
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Messages are supplied by callers as a string-formatting template, plus values
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to be inserted into it. The actual %-formatting is deferred to the log
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library so that it doesn't need to be done for messages that won't be emitted.
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Messages are classified by severity levels: critical, error, warning, info,
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They can be sent to two places: to stderr, and to ~/.bzr.log. For purposes
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such as running the test suite, they can also be redirected away from both of
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those two places to another location.
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~/.bzr.log gets all messages, and full tracebacks for uncaught exceptions.
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This trace file is always in UTF-8, regardless of the user's default encoding,
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so that we can always rely on writing any message.
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Output to stderr depends on the mode chosen by the user. By default, messages
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of info and above are sent out, which results in progress messages such as the
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list of files processed by add and commit. In quiet mode, only warnings and
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above are shown. In debug mode, stderr gets debug messages too.
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Errors that terminate an operation are generally passed back as exceptions;
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others may be just emitted as messages.
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Exceptions are reported in a brief form to stderr so as not to look scary.
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BzrErrors are required to be able to format themselves into a properly
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explanatory message. This is not true for builtin exceptions such as
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KeyError, which typically just str to "0". They're printed in a different
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"""Messages and logging for bazaar-ng
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Messages are sent out through the Python logging library.
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They can be sent to two places: to stderr, and to ~/.bzr.log.
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~/.bzr.log gets all messages, and tracebacks of all uncaught
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Normally stderr only gets messages of level INFO and higher, and gets
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only a summary of exceptions, not the traceback.
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# TODO: in debug mode, stderr should get full tracebacks and also
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# debug messages. (Is this really needed?)
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# TODO: When running the test suites, we should add an additional
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# logger that sends messages into the test log file.
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# FIXME: Unfortunately it turns out that python's logging module
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# is quite expensive, even when the message is not printed by any handlers.
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# We should perhaps change back to just simply doing it here.
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# On the other hand, as of 1.2 we generally only call the mutter() statement
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# if (according to debug_flags) we actually intend to write it. So the
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# increased cost of logging.py is not so bad, and we could standardize on
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from bzrlib.lazy_import import lazy_import
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lazy_import(globals(), """
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from cStringIO import StringIO
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lazy_import(globals(), """
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# global verbosity for bzrlib; controls the log level for stderr; 0=normal; <0
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# is quiet; >0 is verbose.
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# File-like object where mutter/debug output is currently sent. Can be
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# changed by _push_log_file etc. This is directly manipulated by some
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# external code; maybe there should be functions to do that more precisely
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# than push/pop_log_file.
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# Absolute path for ~/.bzr.log. Not changed even if the log/trace output is
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# redirected elsewhere. Used to show the location in --version.
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_bzr_log_filename = None
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# The time the first message was written to the trace file, so that we can
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# show relative times since startup.
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_bzr_log_start_time = bzrlib._start_time
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# held in a global for quick reference
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_stderr_handler = None
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class QuietFormatter(logging.Formatter):
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"""Formatter that supresses the details of errors.
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This is used by default on stderr so as not to scare the user.
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# At first I tried overriding formatException to suppress the
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# exception details, but that has global effect: no loggers
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# can get the exception details is we suppress them here.
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def format(self, record):
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if record.levelno >= logging.WARNING:
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s = 'bzr: ' + record.levelname + ': '
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s += record.getMessage()
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##s = textwrap.fill(s)
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# give just a summary of the exception, not the whole thing
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exinfo = traceback.extract_tb(record.exc_info[2])
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# the format of this string matches one of the REs
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s += (' at %s line %d, in %s()\n' % exinfo[-1][:3])
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s += ' see ~/.bzr.log for debug information'
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# configure convenient aliases for output routines
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_bzr_logger = logging.getLogger('bzr')
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def note(*args, **kwargs):
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# FIXME note always emits utf-8, regardless of the terminal encoding
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# FIXME: clearing the ui and then going through the abstract logging
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# framework is whack; we should probably have a logging Handler that
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# deals with terminal output if needed.
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bzrlib.ui.ui_factory.clear_term()
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_bzr_logger.info(*args, **kwargs)
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def warning(*args, **kwargs):
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bzrlib.ui.ui_factory.clear_term()
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_bzr_logger.warning(*args, **kwargs)
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# configure convenient aliases for output routines
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# TODO: deprecate them, have one name for each.
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info = note = _bzr_logger.info
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warning = _bzr_logger.warning
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log_error = _bzr_logger.error
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error = _bzr_logger.error
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def mutter(fmt, *args):
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if _trace_file is None:
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if (getattr(_trace_file, 'closed', None) is not None) and _trace_file.closed:
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if isinstance(fmt, unicode):
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fmt = fmt.encode('utf8')
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# It seems that if we do ascii % (unicode, ascii) we can
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# get a unicode cannot encode ascii error, so make sure that "fmt"
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# is a unicode string
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if isinstance(arg, unicode):
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arg = arg.encode('utf8')
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real_args.append(arg)
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out = fmt % tuple(real_args)
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timestamp = '%0.3f ' % (time.time() - _bzr_log_start_time,)
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out = timestamp + out + '\n'
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_trace_file.write(out)
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# no need to flush here, the trace file is now linebuffered when it's
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def mutter_callsite(stacklevel, fmt, *args):
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"""Perform a mutter of fmt and args, logging the call trace.
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:param stacklevel: The number of frames to show. None will show all
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:param fmt: The format string to pass to mutter.
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:param args: A list of substitution variables.
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traceback.print_stack(limit=stacklevel + 1, file=outf)
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formatted_lines = outf.getvalue().splitlines()
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formatted_stack = '\n'.join(formatted_lines[:-2])
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mutter(fmt + "\nCalled from:\n%s", *(args + (formatted_stack,)))
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mutter = _bzr_logger.debug
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debug = _bzr_logger.debug
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# we do the rollover using this code, rather than the default from python
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# logging, because we only want to rollover at program startup, not on each
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# message. maybe that's not a good enough reason.
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def _rollover_trace_maybe(trace_fname):
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if size <= 4 << 20:
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old_fname = trace_fname + '.old'
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osutils.rename(trace_fname, old_fname)
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from osutils import rename
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rename(trace_fname, old_fname)
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def _get_bzr_log_filename():
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bzr_log = os.environ.get('BZR_LOG')
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home = os.environ.get('BZR_HOME')
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if sys.platform == 'win32':
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from bzrlib import win32utils
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home = win32utils.get_home_location()
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home = os.path.expanduser('~')
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return os.path.join(home, '.bzr.log')
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"""Open the .bzr.log trace file.
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If the log is more than a particular length, the old file is renamed to
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.bzr.log.old and a new file is started. Otherwise, we append to the
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This sets the global _bzr_log_filename.
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global _bzr_log_filename
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_bzr_log_filename = _get_bzr_log_filename()
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_rollover_trace_maybe(_bzr_log_filename)
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def open_tracefile(tracefilename='~/.bzr.log'):
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# Messages are always written to here, so that we have some
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# information if something goes wrong. In a future version this
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# file will be removed on successful completion.
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trace_fname = os.path.join(os.path.expanduser(tracefilename))
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_rollover_trace_maybe(trace_fname)
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# buffering=1 means line buffered
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bzr_log_file = open(_bzr_log_filename, 'at', 1) # line buffered
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# bzr_log_file.tell() on windows always return 0 until some writing done
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bzr_log_file.write('\n')
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if bzr_log_file.tell() <= 2:
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bzr_log_file.write("this is a debug log for diagnosing/reporting problems in bzr\n")
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bzr_log_file.write("you can delete or truncate this file, or include sections in\n")
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bzr_log_file.write("bug reports to https://bugs.launchpad.net/bzr/+filebug\n\n")
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tf = codecs.open(trace_fname, 'at', 'utf8', buffering=1)
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if os.fstat(tf.fileno())[stat.ST_SIZE] == 0:
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tf.write("\nthis is a debug log for diagnosing/reporting problems in bzr\n")
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tf.write("you can delete or truncate this file, or include sections in\n")
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tf.write("bug reports to bazaar-ng@lists.canonical.com\n\n")
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_file_handler = logging.StreamHandler(tf)
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fmt = r'[%(process)5d] %(asctime)s.%(msecs)03d %(levelname)s: %(message)s'
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datefmt = r'%a %H:%M:%S'
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_file_handler.setFormatter(logging.Formatter(fmt, datefmt))
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_file_handler.setLevel(logging.DEBUG)
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logging.getLogger('').addHandler(_file_handler)
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except IOError, e:
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warning("failed to open trace file: %s" % (e))
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# TODO: What should happen if we fail to open the trace file? Maybe the
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# objects should be pointed at /dev/null or the equivalent? Currently
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# returns None which will cause failures later.
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def enable_default_logging():
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"""Configure default logging: messages to stderr and debug to .bzr.log
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This should only be called once per process.
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Non-command-line programs embedding bzrlib do not need to call this. They
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can instead either pass a file to _push_log_file, or act directly on
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logging.getLogger("bzr").
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Output can be redirected away by calling _push_log_file.
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# create encoded wrapper around stderr
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bzr_log_file = _open_bzr_log()
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push_log_file(bzr_log_file,
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r'[%(process)5d] %(asctime)s.%(msecs)03d %(levelname)s: %(message)s',
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r'%Y-%m-%d %H:%M:%S')
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# after hooking output into bzr_log, we also need to attach a stderr
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# handler, writing only at level info and with encoding
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writer_factory = codecs.getwriter(osutils.get_terminal_encoding())
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encoded_stderr = writer_factory(sys.stderr, errors='replace')
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stderr_handler = logging.StreamHandler(encoded_stderr)
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stderr_handler.setLevel(logging.INFO)
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logging.getLogger('bzr').addHandler(stderr_handler)
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def push_log_file(to_file, log_format=None, date_format=None):
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"""Intercept log and trace messages and send them to a file.
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:param to_file: A file-like object to which messages will be sent.
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:returns: A memento that should be passed to _pop_log_file to restore the
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previously active logging.
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new_handler = logging.StreamHandler(to_file)
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new_handler.setLevel(logging.DEBUG)
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if log_format is None:
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log_format = '%(levelname)8s %(message)s'
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new_handler.setFormatter(logging.Formatter(log_format, date_format))
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# save and remove any existing log handlers
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bzr_logger = logging.getLogger('bzr')
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old_handlers = bzr_logger.handlers[:]
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del bzr_logger.handlers[:]
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# set that as the default logger
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bzr_logger.addHandler(new_handler)
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bzr_logger.setLevel(logging.DEBUG)
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# TODO: check if any changes are needed to the root logger
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# TODO: also probably need to save and restore the level on bzr_logger.
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# but maybe we can avoid setting the logger level altogether, and just set
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# the level on the handler?
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# save the old trace file
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old_trace_file = _trace_file
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# send traces to the new one
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_trace_file = to_file
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result = new_handler, _trace_file
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return ('log_memento', old_handlers, new_handler, old_trace_file, to_file)
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def pop_log_file((magic, old_handlers, new_handler, old_trace_file, new_trace_file)):
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"""Undo changes to logging/tracing done by _push_log_file.
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This flushes, but does not close the trace file.
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Takes the memento returned from _push_log_file."""
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assert magic == 'log_memento'
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_trace_file = old_trace_file
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bzr_logger = logging.getLogger('bzr')
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bzr_logger.removeHandler(new_handler)
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# must be closed, otherwise logging will try to close it atexit, and the
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# file will likely already be closed underneath.
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bzr_logger.handlers = old_handlers
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new_trace_file.flush()
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@symbol_versioning.deprecated_function(symbol_versioning.one_two)
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def enable_test_log(to_file):
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"""Redirect logging to a temporary file for a test
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:returns: an opaque reference that should be passed to disable_test_log
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after the test completes.
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return push_log_file(to_file)
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@symbol_versioning.deprecated_function(symbol_versioning.one_two)
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def disable_test_log(memento):
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return pop_log_file(memento)
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def log_startup(argv):
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debug('bzr %s invoked on python %s (%s)',
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'.'.join(map(str, sys.version_info)),
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debug(' arguments: %r', argv)
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debug(' working dir: %r', os.getcwdu())
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def log_exception(msg=None):
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"""Log the last exception to stderr and the trace file.
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The exception string representation is used as the error
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summary, unless msg is given.
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if msg and (msg[-1] == '\n'):
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msg += '\n command: %s' % ' '.join(repr(arg) for arg in sys.argv)
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msg += '\n pwd: %r' % os.getcwdu()
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msg += '\n error: %s' % ei[0] # exception type
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_bzr_logger.exception(msg)
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def log_exception_quietly():
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interesting to developers but not to users. For example,
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errors loading plugins.
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mutter(traceback.format_exc())
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def set_verbosity_level(level):
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"""Set the verbosity level.
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:param level: -ve for quiet, 0 for normal, +ve for verbose
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global _verbosity_level
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_verbosity_level = level
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_update_logging_level(level < 0)
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def get_verbosity_level():
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"""Get the verbosity level.
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See set_verbosity_level() for values.
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return _verbosity_level
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def be_quiet(quiet=True):
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# Perhaps this could be deprecated now ...
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set_verbosity_level(-1)
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set_verbosity_level(0)
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def _update_logging_level(quiet=True):
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"""Hide INFO messages if quiet."""
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_bzr_logger.setLevel(logging.WARNING)
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_bzr_logger.setLevel(logging.INFO)
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"""Is the verbosity level negative?"""
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return _verbosity_level < 0
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"""Is the verbosity level positive?"""
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return _verbosity_level > 0
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@symbol_versioning.deprecated_function(symbol_versioning.one_two)
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debug(traceback.format_exc())
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def enable_default_logging():
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"""Configure default logging to stderr and .bzr.log"""
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global _stderr_handler, _file_handler
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_stderr_handler = logging.StreamHandler()
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_stderr_handler.setFormatter(QuietFormatter())
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if not _file_handler:
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if os.environ.get('BZR_DEBUG'):
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level = logging.DEBUG
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_stderr_handler.setLevel(logging.INFO)
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_file_handler.setLevel(level)
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_bzr_logger.setLevel(level)
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logging.getLogger('').addHandler(_stderr_handler)
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def disable_default_logging():
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"""Turn off default log handlers.
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Don't call this method, use _push_log_file and _pop_log_file instead.
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def report_exception(exc_info, err_file):
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"""Report an exception to err_file (typically stderr) and to .bzr.log.
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This will show either a full traceback or a short message as appropriate.
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:return: The appropriate exit code for this error.
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exc_type, exc_object, exc_tb = exc_info
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# Log the full traceback to ~/.bzr.log
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log_exception_quietly()
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if (isinstance(exc_object, IOError)
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and getattr(exc_object, 'errno', None) == errno.EPIPE):
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err_file.write("bzr: broken pipe\n")
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return errors.EXIT_ERROR
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elif isinstance(exc_object, KeyboardInterrupt):
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err_file.write("bzr: interrupted\n")
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return errors.EXIT_ERROR
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elif not getattr(exc_object, 'internal_error', True):
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report_user_error(exc_info, err_file)
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return errors.EXIT_ERROR
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elif isinstance(exc_object, (OSError, IOError)):
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# Might be nice to catch all of these and show them as something more
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# specific, but there are too many cases at the moment.
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report_user_error(exc_info, err_file)
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return errors.EXIT_ERROR
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report_bug(exc_info, err_file)
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return errors.EXIT_INTERNAL_ERROR
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# TODO: Should these be specially encoding the output?
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def report_user_error(exc_info, err_file):
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"""Report to err_file an error that's not an internal error.
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These don't get a traceback unless -Derror was given.
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if 'error' in debug.debug_flags:
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report_bug(exc_info, err_file)
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err_file.write("bzr: ERROR: %s\n" % (exc_info[1],))
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def report_bug(exc_info, err_file):
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"""Report an exception that probably indicates a bug in bzr"""
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exc_type, exc_object, exc_tb = exc_info
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err_file.write("bzr: ERROR: %s.%s: %s\n" % (
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exc_type.__module__, exc_type.__name__, exc_object))
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traceback.print_exception(exc_type, exc_object, exc_tb, file=err_file)
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err_file.write('bzr %s on python %s (%s)\n' % \
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'.'.join(map(str, sys.version_info)),
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err_file.write('arguments: %r\n' % sys.argv)
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'encoding: %r, fsenc: %r, lang: %r\n' % (
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osutils.get_user_encoding(), sys.getfilesystemencoding(),
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os.environ.get('LANG')))
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err_file.write("plugins:\n")
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for name, a_plugin in sorted(plugin.plugins().items()):
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err_file.write(" %-20s %s [%s]\n" %
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(name, a_plugin.path(), a_plugin.__version__))
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*** Bazaar has encountered an internal error.
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Please report a bug at https://bugs.launchpad.net/bzr/+filebug
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including this traceback, and a description of what you
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were doing when the error occurred.
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This is intended to be used by the test framework, which doesn't
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want leakage from the code-under-test into the main logs.
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l = logging.getLogger('')
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l.removeHandler(_stderr_handler)
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l.removeHandler(_file_handler)
added
removed
bzrlib/trace.py
