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# Copyright 2002 Ben Escoto
#
# This file is part of rdiff-backup.
#
# rdiff-backup is free software; you can redistribute it and/or modify
# 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.
#
# rdiff-backup 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 rdiff-backup; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
# USA
"""Catch various exceptions given system call"""
import errno, signal
import librsync, C, static, rpath, Globals, log, statistics
def check_common_error(error_handler, function, args = []):
"""Apply function to args, if error, run error_handler on exception
This uses the catch_error predicate below to only catch
certain exceptions which seems innocent enough.
"""
try: return function(*args)
except Exception, exc:
TracebackArchive.add([function] + list(args))
if catch_error(exc):
log.Log.exception()
conn = Globals.backup_writer
if conn is not None: conn.statistics.record_error()
if error_handler: return error_handler(exc, *args)
else: return None
log.Log.exception(1, 2)
raise
def catch_error(exc):
"""Return true if exception exc should be caught"""
for exception_class in (rpath.SkipFileException, rpath.RPathException,
librsync.librsyncError, C.UnknownFileTypeError):
if isinstance(exc, exception_class): return 1
if (isinstance(exc, EnvironmentError) and
# the invalid mode shows up in backups of /proc for some reason
(exc[0] == 'invalid mode: rb' or
errno.errorcode.has_key(exc[0]) and
errno.errorcode[exc[0]] in ('EPERM', 'ENOENT', 'EACCES', 'EBUSY',
'EEXIST', 'ENOTDIR', 'ENAMETOOLONG',
'EINTR', 'ENOTEMPTY', 'EIO', 'ETXTBSY',
'ESRCH', 'EINVAL'))):
return 1
return 0
def get_error_handler(error_type):
"""Return error handler function that can be used above
Function will just log error to the error_log and then return
None. First two arguments must be the exception and then an rp
(from which the filename will be extracted).
"""
def error_handler(exc, rp, *args):
log.ErrorLog.write_if_open(error_type, rp, exc)
return 0
return error_handler
def listrp(rp):
"""Like rp.listdir() but return [] if error, and sort results"""
def error_handler(exc):
log.Log("Error listing directory %s" % rp.path, 2)
return []
dir_listing = check_common_error(error_handler, rp.listdir)
dir_listing.sort()
return dir_listing
def signal_handler(signum, frame):
"""This is called when signal signum is caught"""
raise SignalException(signum)
def install_signal_handlers():
"""Install signal handlers on current connection"""
for signum in [signal.SIGQUIT, signal.SIGHUP, signal.SIGTERM]:
signal.signal(signum, signal_handler)
class SignalException(Exception):
"""SignalException(signum) means signal signum has been received"""
pass
class TracebackArchive:
"""Save last 10 caught exceptions, so they can be printed if fatal"""
_traceback_strings = []
def add(cls, extra_args = []):
"""Add most recent exception to archived list
If extra_args are present, convert to strings and add them as
extra information to same traceback archive.
"""
cls._traceback_strings.append(log.Log.exception_to_string(extra_args))
if len(cls._traceback_strings) > 10:
cls._traceback_strings = cls._traceback_strings[:10]
def log(cls):
"""Print all exception information to log file"""
if cls._traceback_strings:
log.Log("------------ Old traceback info -----------\n%s\n"
"-------------------------------------------" %
("\n".join(cls._traceback_strings),), 3)
static.MakeClass(TracebackArchive)
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