/usr/lib/python2.7/dist-packages/nss_cache/util/timestamps.py is in nsscache 0.33-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 | # Copyright 2011 Google 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; 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.
"""Timestamp handling routines."""
__author__ = 'jaq@google.com (Jamie Wilkinson)'
import logging
import os.path
import tempfile
import time
import stat
def ReadTimestamp(filename):
"""Return a timestamp from a file.
The timestamp file format is a single line, containing a string in the
ISO-8601 format YYYY-MM-DDThh:mm:ssZ (i.e. UTC time). We do not support
all ISO-8601 formats for reasons of convenience in the code.
Timestamps internal to nss_cache deliberately do not carry milliseconds.
Args:
filename: A String naming the file to read from.
Returns:
A time.struct_time, or None if the timestamp file doesn't
exist or has errors.
"""
if not os.path.exists(filename):
return None
try:
timestamp_file = open(filename, 'r')
timestamp_string = timestamp_file.read().strip()
except IOError, e:
logging.warn('error opening timestamp file: %s', e)
timestamp_string = None
else:
timestamp_file.close()
logging.debug('read timestamp %s from file %r',
timestamp_string, filename)
if timestamp_string is not None:
try:
# Append UTC to force the timezone to parse the string in.
timestamp = time.strptime(timestamp_string + ' UTC',
'%Y-%m-%dT%H:%M:%SZ %Z')
except ValueError, e:
logging.error('cannot parse timestamp file %r: %s',
filename, e)
timestamp = None
else:
timestamp = None
logging.debug('Timestamp is: %r', timestamp)
now = time.gmtime()
logging.debug(' Now is: %r', now)
if timestamp > now:
logging.warn('timestamp %r (%r) from %r is in the future, now is %r',
timestamp_string, time.mktime(timestamp),
filename, time.mktime(now))
if time.mktime(timestamp) - time.mktime(now) >= 60*60:
logging.info('Resetting timestamp to now.')
timestamp = now
return timestamp
def WriteTimestamp(timestamp, filename):
"""Write a given timestamp out to a file, converting to the ISO-8601 format.
We convert internal timestamp format (epoch) to ISO-8601 format, i.e.
YYYY-MM-DDThh:mm:ssZ which is basically UTC time, then write it out to a
file.
Args:
timestamp: A struct time.struct_time or time tuple.
filename: A String naming the file to write to.
Returns:
A boolean indicating success of write.
"""
# TODO(jaq): hack
if timestamp is None:
return True
timestamp_dir = os.path.dirname(filename)
(filedesc, temp_filename) = tempfile.mkstemp(prefix='nsscache-update-',
dir=timestamp_dir)
time_string = time.strftime('%Y-%m-%dT%H:%M:%SZ', timestamp)
try:
os.write(filedesc, '%s\n' % time_string)
os.fsync(filedesc)
os.close(filedesc)
except OSError:
os.unlink(temp_filename)
logging.warn('writing timestamp failed!')
return False
os.chmod(temp_filename, stat.S_IRUSR|stat.S_IWUSR|stat.S_IRGRP|stat.S_IROTH)
os.rename(temp_filename, filename)
logging.debug('wrote timestamp %s to file %r',
time_string, filename)
return True
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