Re: edit_template variable expansion

[Bas van der Vlies]

On 04/30/2012 10:46 PM, Nick Anderson wrote:

I am just now starting to write some policy that uses the new template
feature, its nice but I did notice that it seems I need to reference all
variables globally.

Is it intended behavior that the variable expansion for edit_template
requires variables to be referenced globally? I can see that all of the
variables in the documentation examples are referenced globally but I
did not see any notes that mentioned it is specifically required.

Nick what do you mean  that you have to put the parameters in common bundle?



  * $(template.cfg[<variabele>]

I have to setup some default ones:

template.cf:

bundle agent template(params)
{
    vars:
        any::
            # An array of configuration parameters used in template files
            #
            "cfg[cacert_file]"      slist  => { 
"/etc/ssl/certs/ca-certificates.crt" },
                policy => "overridable";

            "cfg[domain_name]"      slist  => { "sara.nl" },
                policy => "overridable";

            "cfg[domain_search]"      slist  => { "sara.nl" },
                policy => "overridable";

            "cfg[domain_server]"      slist  => { "145.100.5.47", 
"145.100.5.30" },
                policy => "overridable";

            ## Copy configuration parameters passed, into a local array
            #
            "param_keys" slist => getindices("$(params)");

            ## List overriding
            #
            "cfg[$(param_keys)]" slist => { "@($(params)[$(param_keys)])" },
                policy => "overridable";

            "domain_search_string" string     => join(" ", 
"template.cfg[domain_search]"),
                policy => "overridable";
}

Now each machine/cluster can sets its own parameters:

cluster.cf


           ## Set resolv.conf parameters
            #
            "varray[domain_name]"      slist   => { "irc.sara.nl" },
                 policy => "overridable";
            "varray[domain_search]"      slist   => { "irc.sara.nl", "sara.nl" 
},
                 policy => "overridable";

            ## Initialize template_variables
            #
            "templates" usebundle => template("cluster.varray");


example template:
{{{
[%CFEngine BEGIN %]
search $(template.domain_search_string)
[%CFEngine END %]
[%CFEngine BEGIN %]
nameserver $(template.cfg[domain_server])
[%CFEngine END %]
}}}
--
********************************************************************
*  Bas van der Vlies                    e-mail: b...@sara.nl       *
*  SARA - Academic Computing Services   Amsterdam, The Netherlands *
********************************************************************

This is my setup. In all the template files i use. I don't have to remember in which bundle the variables are set and all parameters are slist variables.

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