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1#!/usr/bin/python
2
3# Time Drift Script
4#		Periodically checks and displays time drift
5#		by john stultz (jstultz@us.ibm.com)
6
7# Copyright (C) 2003-2006 IBM
8#
9# This program is free software; you can redistribute it and/or
10# modify it under the terms of the GNU General Public License as
11# published by the Free Software Foundation; either version 2 of the
12# License, or (at your option) any later version.
13#
14# This program is distributed in the hope that it will be useful, but
15# WITHOUT ANY WARRANTY; without even the implied warranty of
16# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
17# General Public License for more details.
18#
19# You should have received a copy of the GNU General Public License
20# along with this program; if not, write to the Free Software
21# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
22# 02111-1307, USA.
23
24
25# Usage: drift-test.py [-s] [ntp_server [sleep_time]]
26
27import commands
28import sys
29import string
30import time
31
32server_default = "bvrgsa.ibm.com"
33sleep_time_default  = 60
34
35server = ""
36sleep_time = 0
37set_time = 0
38
39#parse args
40for arg in sys.argv[1:]:
41	if arg == "-s":
42		set_time = 1
43	elif server == "":
44		server = arg
45	elif sleep_time == 0:
46		sleep_time = string.atoi(arg)
47
48if server == "":
49	server = server_default
50if sleep_time == 0:
51	sleep_time = sleep_time_default
52
53#set time
54if (set_time == 1):
55	cmd = commands.getoutput('/usr/sbin/ntpdate -ub ' + server)
56
57cmd = commands.getoutput('/usr/sbin/ntpdate -uq ' + server)
58line = string.split(cmd)
59
60#parse original offset
61start_offset = string.atof(line[-2]);
62#parse original time
63start_time = time.localtime(time.time())
64datestr = time.strftime("%d %b %Y %H:%M:%S", start_time)
65
66time.sleep(1)
67while 1:
68	cmd = commands.getoutput('/usr/sbin/ntpdate -uq ' + server)
69	line = string.split(cmd)
70
71	#parse offset
72	now_offset = string.atof(line[-2]);
73
74	#parse time
75	now_time = time.localtime(time.time())
76	datestr = time.strftime("%d %b %Y %H:%M:%S", now_time)
77
78	# calculate drift
79	delta_time = time.mktime(now_time) - time.mktime(start_time)
80	delta_offset = now_offset - start_offset
81	drift =  delta_offset / delta_time * 1000000
82
83	#print output
84	print time.strftime("%d %b %H:%M:%S",now_time),
85	print "	offset:", now_offset ,
86	print "	drift:", drift ,"ppm"
87	sys.stdout.flush()
88
89	#sleep
90	time.sleep(sleep_time)
91