classesmatching

Table of Contents

Prototype: classesmatching(name, tag1, tag2, ...)

Return type: slist

Description: Return the list of set classes matching name and any tags given. Both name and tags are regular expressions. name is required, tags are optional.

This function searches for the given anchored name and optionally tag1, tag2, ... regular expression in the list of currently set classes. The search order is hard, soft, then local to the current bundle.

When any tags are given, only the classes with those tags matching the given anchored regular expressions are returned. Class tags are set using the meta attribute.

Example:

body common control
{
      bundlesequence => { run };
}

bundle agent run
{
  vars:
      "all" slist         => classesmatching(".*");
      "c" slist           => classesmatching("cfengine");
      "c_plus_plus" slist => classesmatching("cfengine", "plus");

      # order of classes is not guaranteed
      "internal_environment_unsorted" slist =>
          classesmatching(".*", 'cfe_internal', 'source=environment');
      "internal_environment" slist =>
          sort(internal_environment_unsorted, lex);

  reports:
      # you may find this list of all classes interesting but it
      # produces different output every time, so it's commented out here
      # "All classes = '$(all)'";

      "All classes with the 'cfe_internal' and 'source=environment' tags = '$(internal_environment)'";

      "Classes matching 'cfengine' = '$(c)'";

      # this should produce no output
      "Classes matching 'cfengine' with the 'plus' tag = $(c_plus_plus)";
}

Output:

R: All classes with the 'cfe_internal' and 'source=environment' tags = '_cfe_output_testing'
R: All classes with the 'cfe_internal' and 'source=environment' tags = 'agent'
R: All classes with the 'cfe_internal' and 'source=environment' tags = 'opt_dry_run'
R: Classes matching 'cfengine' = 'cfengine'

Note: This function replaces the allclasses.txt static file available in older versions of CFEngine.

History: Introduced in CFEngine 3.6