Yeah, I found a post (from you, I think) from a few months back that
said as much. Any ideas for more elegant workarounds?
As I said, I've got one, but it's ugly, and I'd like something a bit
more elegant and concise.
On Sat, Dec 18, 2010 at 02:45:20AM -0500, Seva Gluschenko wrote:
>Jesse,
>
>unfortunately, the Cfengine has limitations when evaluating variables,
>so deep nesting should be avoided as far as possible. I'm not the
>Cfengine developer to tell for sure whether you met the natural limit
>of the evaluation depth, or is it just a bug, but this behaviour
>remains pretty the same since 3.0.4.
>
>2010/12/18 Jesse Becker <becker...@mail.nih.gov>:
>> So, the snipped below does not work, but I wish that it did. ?It also
>> isn't limited to package promises either, I can think of cases for file
>> and command promises as well.
>>
>> At a high level, I am trying to define per-host lists, then iterate over
>> those lists, but only on the appropriate host.
>>
>> <-----snip----->
>>
>> bundle agent testing {
>>
>> vars:
>> ? ? any:: ? 'common' ? ? ?slist => { 'foo', 'quux', 'fubar' };
>> ? ? alpha:: 'pkgs[alpha]' slist => { 'foo', 'bar', 'baz' };
>> ? ? beta:: ?'pkgs[beta]' ?slist => { @{common}, 'yipyip' };
>> ? ? delta:: 'pkgs[delta]' slist => { ?'yipyip' };
>>
>> packages:
>>
>> ? ? # only "NY" is needed, since the others are squished into this in
>> ? ? # yum.cf
>> ? ? centos.!NY::
>> ? ? ? ? "${pkgs[${sys.uqhost}]}"
>> ? ? ? ? ? ? handle ? ? ? ? => "per_host_packages_for_${sys.uqhost}",
>> ? ? ? ? ? ? package_policy => 'add',
>> ? ? ? ? ? ? package_method => yum,
>> ? ? ? ? ? ? ifvarclass ? ? => isvariable("pkgs[${sys.uqhost}]"),
>> ? ? ? ? ? ? package_architectures => { 'x86_64' };
>> }
>>
>> <-----snip----->
>>
>>
>> What happens is that "${pkgs[${sys.uqhost}]}" is evaluated once, with
>> only "${sys.uqhost}" getting processed, leaving the string as a literal
>> "${pkgs[alpha]}" ). ?This will, of course, fail when passed to the
>> actual promise in question.
>>
>> I do have a workaround, but it's inelegant. ?Bascially, flatten the
>> array into multiple slists, and have a separate promise for each one,
>> based on the hostnames.
>>
>> So my question: ?Is there a concise way to do something like what I've
>> posted above?
>>
>>
>> --
>> Jesse Becker
>> NHGRI Linux support (Digicon Contractor)
>> _______________________________________________
>> Help-cfengine mailing list
>> Help-cfengine@cfengine.org
>> https://cfengine.org/mailman/listinfo/help-cfengine
>>
>
>
>
>--
>SY, Seva Gluschenko.
--
Jesse Becker
NHGRI Linux support (Digicon Contractor)
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