Is there a better way to set a system clock in Python (on a Linux system)

[KDr2]

man 2 clock_settime
call it with ctypes
--
Best Regards,
     -- KDr2 http://kdr2.net




On Thu, May 6, 2010 at 10:47 AM, J <dreadpiratejeff at gmail.com> wrote:

> Is there a better way to do this?
>
> def SkewTime():
>    '''
>    Optional function. We can skew time by 1 hour if we'd like to see real
> sync
>    changes being enforced
>    '''
>    TIME_SKEW=1
>    logging.info('Time Skewing has been selected. Setting clock ahead 1
> hour')
>    # Let's get our current time
>    t = TimeCheck()
>    logging.info('Current time is: %s' % time.asctime(t))
>    # Now create new time string in the form MMDDhhmmYYYY for the date
> program
>    hr = t.tm_hour + TIME_SKEW
>    date_string = time.strftime('%m%d%H%M%Y',(t.tm_year,
>                                            t.tm_mon,
>                                            t.tm_mday,
>                                            hr,
>                                            t.tm_min,
>                                            t.tm_sec,
>                                            t.tm_wday,
>                                            t.tm_yday,
>                                            t.tm_isdst))
>    logging.debug('New date string is: %s' % date_string)
>    logging.debug('Setting new system time/date')
>    status = SilentCall('/bin/date %s' % date_string)
>    logging.info('Pre-sync time is: %s' % time.asctime())
>
> TimeCheck() as referenced above is a simple function that just returns
> the time.time_struct object from time.localtime().  I pull time a few
> times and it was a little cleaner to put that into a function and just
> call the function whenever I needed to.
>
> SilentCall() is a modification of subprocess.call() (which in reality
> just calls Popen(*popenargs,**kwargs).wait()) but it defaults to
> redirecting stdin and stdout to /dev/null to suppress shell output
> from the command being called.
>
> Anyway, what I'm wondering, is, while this works, is there a better
> way to do it than using part of the originally returned time_struct
> and injecting my own new hour argument (hr).
>
> The goal of this function is to just set the system clock one hour
> ahead, so when I call the Linux command 'ntpdate' I can get a real
> time change when it syncs the local clock to an NTP server.
>
> This just looks... well, big to me.  I tried passing only the things I
> really needed to time.strftime(), but apparently, that requires the
> full 9-tuple from time_struct, not just individual parts of it.
>
> Like I said, it works well, I just wonder if there is a cleaner way of
> setting the local clock to a different time in python without having
> to do all this.  The reason most of that exists, is because the linux
> date command expects to see the new date/time like this:
> MMDDhhmmYYYY.ss.
>
> Or am I just looking at this too hard and really did work it out nicely?
>
> Cheers
> Jeff
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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