Re: Number of files in a directory?

[Tim Nelson]

On Tue, 15 Mar 2005, Mark Burgess wrote:

> On Tue, 2005-03-15 at 09:42 -0500, nathan r. hruby wrote:
> > On Tue, 15 Mar 2005, Mark Burgess wrote:
> >
> > > > control:
> > > >         MailQueueCount = ( ExecResult(find /var/spool/mqueue -type f -name 'q*' 
> > > > | wc -l )
> > > >
> > > > classes:
> > > >         MailqueOverLimit = ( ReturnsZero(/usr/bin/test $(MailQueueCount) -ge 
> > > > 12) )
> > > >
> > > >         Warning; completely untested, but it hopefully indicates the way I
> > > > was thinking.  Mark, does this mean that boolean operations would be a
> > > > good idea in cfengine?
> > >
> > > I don't know what you mean by a boolean operation.

        Sorry; boolean was the wrong word; what was I thinking?  :)

> > Well, at least a few additional "operators" like "less than" or "greater
> > than" which return true/false to set a class to prevent this kind of
> > senseless abuse of fork() :)
> >
> > control:
> >         x = ( ExecResult( something-big ) )
> >         y = ( ExecResult( something-small ) )
> >
> > classes:
> >         XisBiggerThanY = ( GreaterThan( $(x) $(y) ) )
> >
> > Yeah, this looks perl-esque, but I think a few extra operators would be
> > handy (We already have a substr() ).. I see there are already tests like
> > this in the cmp= operator for packages: and bymatches= for processes: so
> > it might make sense to refactor that code into something for more general
> > use?
>
> Ah - I see. Yes, this is easily added. There are things like strcmp
> already, but tell me what you want and I'll try to add them before next
> release.

        Well, the obvious ones would be:

< > <= >= == != <=>

	(stolen blatantly from man perlop).  We can already use Strcmp for 
== and ! Strcmp for !=.  Also, <= can be simulated via ! > and >= via ! <. 
Also, it doesn't seem to me that <=> is particularly useful in the 
cfengine situation (and it can be simulated with the others).  That leaves:

< >

        Or if you prefer named operators: le ge

        Or using Nathan's suggestion: LessThan, GreaterThan

	I prefer the symbolic ones (being a Perl-type guy), but Nathan's 
operators look more cfenginely.

        :)

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Tim Nelson
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