Jails: Setting different times in jails

[Kurt Lidl]

On Sat, Jul 09, 2011 at 11:19:23PM -0600, Warner Losh wrote:
> Why on earth would you want this?

Oh, it's not hard to imagine why you want to do this.  Say
you're testing a particular date rollover event, and want
to make sure your software is up to snuff.  Doing it in a
jail would make it easy to do it.

I hacked over a unix kernel to do this for Y2K testing, along with
the company's mandatory 9/9/99 testing (and we extended it through
to 1-Mar-2000 just to be thorough).  In that case, not only did I
just start the systems with a clock value of 9/8/99, I hacked it
so the time was incremented by one second at each hardclock, rather
than 1/100 of a second.  So my applications saw every second of
every "day" between 9/8/99 and 3/1/00.  (Remember that 28-Feb-2000
went straight through to 1-Mar-2000 -- 2000 was NOT a leap year!)

Heck, maybe if this got put in, Apple would pick it up and finally
make the calandering stuff in OS X not fail every daylight savings
time.  Nah, I'm just dreaming now...

-Kurt

> On Jul 7, 2011, at 2:31 AM, grarpamp wrote:
> 
> >> possibly achievable in libc?
> > 
> > I don't know. Where else would it be done?
> > stat, utimes, gettimeofday, clock_gettime,
> > adjtime, etc and their variations.
> > 
> > I've not checked what currently happens, but I
> > don't think root in a jail should be able to set
> > any kernel time parameters, absent a syscall
> > that says it should.
> > 
> >> in any case file this idea somewhere.. :-)
> > 
> > Don't know here either. I looked at the lists and
> > hackers seemed closest. I'll bcc current. Someone
> > could maybe todo-wiki this thread as low hanging
> > fruit. Cheers.
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> > 
> 
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