Foo wrote:
> On Mon, 06 Apr 2009 19:41:52 +0200, Martin Simmons <mar...@lispworks.com>
> wrote:
>
>
>>>>>>> On Mon, 06 Apr 2009 17:34:09 +0200, Foo said:
>>>>>>>
>>> The best solution would be for Bacula to translate time to UTC
>>> internally
>>> for scheduling, everything external such as logfiles, scheduling stanzas
>>> in config etc. would remain in the user's locale.
>>>
>> That doesn't help, because saying 2:05am local time in the config file is
>> still ambiguous if the local time moves backwards by 1 hour at 3:00am.
>>
>
> Not really, UTC remains the same on DST changes, so internal events using
> UTC should be fine.
>
> Basically on startup Bacula needs to check the locale, get the offset from
> UTC, if any, and set its internal clock to UTC, and change the offset on
> DST changes. Then use the offset for calculations involving configs/user
> output like logging.
>
>
>> To resolve this, Bacula would have to use UTC in the config file as well.
>>
>
> See above.
>
>
>> Alternatively, it would need some non-trivial code to deal with the
>> duplicate/missing local times.
>>
>
> I don't see how this is not trivial code. I would assume some standard
> library/system clock routines are used for time, just put a filter routine
> in between and call that instead (hopefully this should be a search and
> replace in the code).
>
Yeah, I think it shouldn't be too difficult. I assume that there is a
dispatcher routine somewhere that gets called once a minute or so.
Simply keep track of the time it was last called.
Pseudocode:
void dispatchEvents() {
static time lastDispatchTime = 0; // probably 1/1/1970
time currentTime = getCurrentTime();
// we need to initialize lastDispatchTime, or else we would later
call everything
// due to happen since 1970!
if (lastDispatchTime == 0)
lastDispatchTime = currentTime - 1 minute;
if (currentTime < lastDispatchTime) {
// do nothing. We are in the duplicate hour in spring.
} else {
// identify all events that were scheduled between
lastDispatchTime and currentTime.
// This will execute everything due to happen in the last minute,
and also anything scheduled
// for the missing hour. in fall.
lastDispatchTime = currentTime;
}
}
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