[OE-core] [PATCH] oe_syslog.py: Handle syslogd/klogd restart race

[richard.purdie at linuxfoundation.org]

On Fri, 2019-06-21 at 12:39 -0400, Jon Mason wrote:
> On Fri, Jun 21, 2019 at 12:14 PM Richard Purdie
> <richard.purdie at linuxfoundation.org> wrote:
> > On Fri, 2019-06-21 at 11:42 -0400, Jon Mason wrote:
> > > 
> > Thanks, I think this is reasonable however I think we may need to
> > make
> > the above a function and then call it from other places in the
> > tests in
> > that file.
> > 
> > test_syslog_restart should check it did restart using the above
> > 
> > test_syslog_startup_config does a second restart which we should
> > also
> > check?
> 
> Seems reasonable.  I'll crank out v2 shortly.
> 
> > Out of interest were you able to see error codes being returned in
> > status in your tests?
> 
> I used code to force every error path during development, but not
> that
> the testcase will fail.  So, your question did cause me to notice a
> bug in the code when verifying that the old ones are no longer
> running.  That should return 0 if still running, which wouldn't cause
> the assert outside of the loop.  So, I'll need to tweak this there.
> v2 will have this fix as well.

The reason I ask is that its far from clear that busybox's starts-stop-
daemon would notice if the daemon didn't restart so I don't think we
can reliably trust status to be set correctly.

Is there any reason we can't run these checks regardless of status?

I realise there is slightly more overhead but it might give us more
chance of fixing all the races?

Cheers,

Richard