Forum: CFEngine Help
Subject: Re: "expand_scalars" in "copy_from"?
Author: davidlee
Link to topic: https://cfengine.com/forum/read.php?3,23643,23669#msg-23669

Mark, Many thanks for your reply.  I don't quite understand it; it appears to 
talk about two different things.

I can see that if the template file on the server is huge, and cfengine is 
checking every few minutes, then it would have to copy this file around every 
single time, and 99.99...% of the time, there will be no change.  So I can see 
a potentially significant efficiency gain in that case.  I'll buy that as a 
good argument concerning large files (without getting side-tracked here into 
what "large" means).

But the next sentence in the same paragraph (which implies some sort of 
relationship) talks about convergence, as a principle, but as far as I read it, 
unrelated to size.  It suggests that two explicit stages could be demonstrably 
convergent, but (by implication) a single "copy-and-edit" wouldn't necessarily 
be demonstrably convergent.  (My use of language in cfengine-speak may be poor 
there.)  If the separate copy and edit stages in an explicit two-stage process 
are convergent, then wouldn't a single "copy-and-edit" also be convergent with 
similar demonstrability?  Or is there a fundamental difference in convergence 
between the two techniques?

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