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#
# debug.py: Helper routines for debugging
#
# Copyright 2008, Red Hat Inc.
#
# 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; version 2 of the License.
#
# 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 Library 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
#
import logging
import logging.handlers
import optparse
import sys
def handle_logging(option, opt, val, parser, logger, level):
if level < logger.level:
logger.setLevel(level)
def handle_logfile(option, opt, val, parser, logger, stream):
try:
logfile = logging.FileHandler(val,"a")
except IOError, (err, msg):
raise optparse.OptionValueError("Cannot open file '%s' : %s" %
(val, msg))
logger.removeHandler(stream)
logger.addHandler(logfile)
def setup_logging(parser = None):
"""Set up the root logger and add logging options.
Set up the root logger so only warning/error messages are logged to stderr
by default.
Also, optionally, add --debug, --verbose and --logfile command line options
to the supplied option parser, allowing the root logger configuration to be
modified by the user.
Note, to avoid possible namespace clashes, setup_logging() will only ever
add these three options. No new options will be added in the future.
parser -- an optparse.OptionParser instance, or None
"""
logger = logging.getLogger()
logger.setLevel(logging.WARN)
stream = logging.StreamHandler(sys.stderr)
logger.addHandler(stream)
if parser is None:
return
group = optparse.OptionGroup(parser, "Debugging options",
"These options control the output of logging information during image creation")
group.add_option("-d", "--debug",
action = "callback", callback = handle_logging,
callback_args = (logger, logging.DEBUG),
help = "Output debugging information")
group.add_option("-v", "--verbose",
action = "callback", callback = handle_logging,
callback_args = (logger, logging.INFO),
help = "Output verbose progress information")
group.add_option("", "--logfile", type="string",
action = "callback", callback = handle_logfile,
callback_args = (logger, stream),
help = "Save debug information to FILE", metavar = "FILE")
parser.add_option_group(group)
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