Hello,
I'm trying to write a policy (attached at the end) to play with resolv.conf. For
it to work i need to use $(this) context and i can't understand why and when
should
i use $(this). Doc is not clear and doesn't seem to even talk about this case.
I've found this "trick" on examples/unit_resolveconf.cf.
Could someone please explain why and when it's needed? Am i missing something
obvious?
Example policy works as expected:
body common control {
inputs => { "cfengine_stdlib.cf"};
bundlesequence => {"main"};
}
bundle agent main {
vars:
"resolv[domains]" slist => { "example.net" };
"resolv[dns_servers]" slist => { "10.0.0.1", "10.0.0.2" };
methods:
"foo" usebundle => resolv_conf("main.resolv");
}
bundle agent resolv_conf(cnf){
files:
"/tmp/resolv.conf"
edit_defaults => no_backup,
edit_line =>
resolvconf("@($(this.cnf)[domains])",
"@($(this.cnf)[dns_servers])");
}
If i remove $this from the the last line to look like this:
edit_line => resolvconf("@($(cnf)[domains])",
"@($(cnf)[dns_servers])");
Fails to compile with:
!! List parameter "$(cnf)[domains]" not found while constructing scope
"resolvconf" - use @(scope.variable) in calling reference
!! List parameter "$(cnf)[dns_servers]" not found while constructing scope
"resolvconf" - use @(scope.variable) in calling reference
Thanks a lot.
Regards.
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