Re: variable if class

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:

,----
| reports:
| 
|     "CFEngine $(sys.cf_version)";
| 
|     "$(ssh_key)"
|       # if => "exists_ssh_key";
|       if => fileexists( "$(ssh_key_dir)/$(user).cf" );
`----
Listing 1: Example Snippet

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.

,----
| 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";
| }
`----
Listing 2: Example Policy

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Nick Anderson | Doer of Things | (+1) 785-550-1767 | https://northern.tech

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