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Re: Executing a file only on later passes


From: Mark . Burgess
Subject: Re: Executing a file only on later passes
Date: Mon, 3 Nov 2003 17:07:37 +0100 (MET)

It is possible to prove that the most rudimentary dependency can always
be solved in a convergent manner in 2 iterations, so time is spent
trying to resolve suvh things so that any "unsafe" states can be
eliminated over long times.

The second pass is only executed by cfengine if there is a possiblity
that it might be required. (That is not practical to evaluate exactly)

Nothing will be executed twice, so I cannot understand how this "clutters"
things. 

M

On  3 Nov, Wheeler, John wrote:
> Please help me understand its usefulness. I've been unable to figure out
> what it's needed for. Does someone have an example of how this feature
> is used? Is there something in the docs I've missed indicating how this
> can be utilized? Why 2 passes? Seems arbitrary (an uniformed
> assumption).
> 
> I'd love to have a reason to keep it in (I've got to patch my rpms now),
> more importantly, actually use it, but for me it just clutters things.
> 
>> -----Original Message-----
>> From: Mark Burgess [mailto:address@hidden
>> Sent: Monday, November 03, 2003 3:18 AM
>> To: Wheeler, John
>> Cc: address@hidden
>> Subject: Re: Executing a file only on later passes
>> 
>> 
>> Please do not mess with this. If you don't understand things leave
> them
>> alone. The second pass is for resolving secondary dependencies and
>> is automatic.
>> 
>> M
>> 
>> On 24 Oct, Wheeler, John wrote:
>> > If you don't actually use the 2nd pass (honestly I haven't found a
>> > single use for this, I'd be interested to see if anyone has) you
> could
>> > recompile the code to just have a single pass. I've done this and it
>> > makes writing and debugging automation much simpler.
>> >
>> > openlog(VPREFIX,LOG_PID|LOG_NOWAIT|LOG_ODELAY,LOG_USER);
>> >
>> > CheckSystemVariables();
>> >
>> > SetReferenceTime(false); /* Reset */
>> >
>> > DoTree(1,"Main Tree");
>> > /* DoTree(2,"Main Tree"); */
>> > DoAlerts();
>> >
>> > SummarizeObjects();
>> >
>> > closelog();
>> > return 0;
>> > }
>> > "cfagent.c" line 195 of 1948 --10%-- col 1
>> >
>> >
>> >
>> > I made this modification in 2.0.6.
>> >
>> >
>> >
>> >> -----Original Message-----
>> >> From: Chip Seraphine [mailto:address@hidden
>> >> Sent: Friday, October 24, 2003 2:36 PM
>> >> To: cfengine
>> >> Subject: Executing a file only on later passes
>> >>
>> >>
>> >> I have a file called cf.finish that performs some cleanup and
>> >> notification tasks that I only want done absolutely dead last, so
>> >> that all the other actions have a chance to set various classes.
> It
>> >> is imported last from cfagent.conf.
>> >>
>> >> Unfortunately, -d2 output shows that it executes before the second
>> > pass
>> >> is performed for many of the other imported files.  This causes
>> >> cf.finish to miss a lot of things it needs to be able to see.
>> >>
>> >> I don't see any kind of 'pass1' or 'pass2' hardclasses being set
>> > (which
>> >> makes sense, as cfengine doesn't like to unset classes, making a
>> >> 'pass flag' class unwieldy).  So how should I do this?  What method
>> >>will safely guarantee that the contents of an imported file will
> only
>> > execute
>> >> on the second pass?
>> >>
>> >> Thanks,
>> >>
>> >> -c
>> >>
>> >> "I had a falling out with God.  I wanted the Cubs to win the World
>> >> Series and he wanted them to continue to suck." - Andy Richter
>> >>
>> >>
>> >>
>> >> _______________________________________________
>> >> Help-cfengine mailing list
>> >> address@hidden
>> >> http://mail.gnu.org/mailman/listinfo/help-cfengine
>> >
>> >
>> > _______________________________________________
>> > Help-cfengine mailing list
>> > address@hidden
>> > http://mail.gnu.org/mailman/listinfo/help-cfengine
>> 
>> --
>> 
>> 
>> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> Work: +47 22453272            Email:  address@hidden
>> Fax : +47 22453205            WWW  :  http://www.iu.hio.no/~mark
>> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 
> 
> 
> _______________________________________________
> Help-cfengine mailing list
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Work: +47 22453272            Email:  address@hidden
Fax : +47 22453205            WWW  :  http://www.iu.hio.no/~mark
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