Re: variable if class

ah...cool, but  it somehow dont want to iterate now when using a list of 
users, btw...this is a problem which makes me run in circles quite often...

bundle agent var_if_test {

    vars:
     "user" slist => {"schast", "wimm", "schama" };

     "ssh_key_dir" string => "/root/cfe_testbed/user_ssh_keys";

     "ssh_key"      string => readfile("$(ssh_key_dir)/$(user).cf"),
                       if => "exists_ssh_key_$(user)";


    classes:


            "exists_ssh_key_$(user)"          expression => 
fileexists("$(ssh_key_dir)/$(user).cf");

    reports:

        "CFEngine $(sys.cf_version)";

      "$(user) -> $(ssh_key)"
        if => "exists_ssh_key";


}



bundle agent __main__
{
  methods:
      "var_if_test";
}

root@aixtest01: /root/cfe_testbed # /var/cfengine/bin/cf-agent -KI 
--show-evaluated-vars=var_if_test -f ./var_if_test.cf
R: CFEngine 3.15.4
Variable name                            Variable 
value                                               Meta tags
default:var_if_test.ssh_key              
ssh-schamakey                                                source=promise
default:var_if_test.ssh_key_dir          
/root/cfe_testbed/user_ssh_keys                              source=promise
default:var_if_test.user                  
{"schast","wimm","schama"}                                  source=promise

only key of last item in list (key, user) is shown...



On Tuesday, November 9, 2021 at 3:21:25 PM UTC+1 Nick Anderson wrote:

> Bas van der Vlies <[email protected]> writes: 
>
> Hi Xander, 
>>
>> your syntax is not correct: if => ( "exists_ssh_key" ); must be: if => 
>> "exists_ssh_key"; 
>>
> Right, 
>
> Alternatively, if there is just a single promise like this that you are 
> guarding you can instead use a function. 
>
> For example: 
> Listing 1: Example Snippet
>
> reports:
>
>     "CFEngine $(sys.cf_version)";
>
>     "$(ssh_key)"
>       # if => "exists_ssh_key";
>       if => fileexists( "$(ssh_key_dir)/$(user).cf" );
>
> But the benefit of having the class is that it can apply to multiple 
> promises without having to re-check the file or re-state the dependancy. 
> Listing 2: Example Policy
>
> bundle agent var_if_test {
>
>   vars:
>       "user" string => "schast";
>
>       "ssh_key_dir" string => "/root/cfe_testbed/user_ssh_keys"
>
> ;
>
>     exists_ssh_key::
>       "ssh_key" string => readfile("$(ssh_key_dir)/$(user).cf");
>
>   
>
> classes:
>
>       "exists_ssh_key"
>         expression => fileexists("$(ssh_key_dir)/$(user).cf");
>
>   reports:
>
>       "CFEngine $(sys.cf_version)"
>
> ;
>
>     exists_ssh_key::
>       "$(ssh_key)";
>
>       "another promise, only if exists_ssh_key is defined";
>
>
> }bundle agent __main__{
>   methods:
>     "var_if_test";}
>
>

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