Table of Contents

lib/feature.cf

Table of Contents

agent bundles

feature

Prototype: feature

Description: Finds feature_set_X and feature_unset_X classes and sets/unsets X persistently

Finds all classes named feature_unset_X and clear class X.

Finds all classes named feature_set_DURATION_X and sets class X persistently for DURATION. DURATION can be any digits followed by k, m, or g.

In inform mode (-I) it will report what it does.

Example: Set class xyz for 10 minutes, class qpr for 100 minutes, and ijk for 90m minutes. Unset class abc. cf-agent -I -f ./feature.cf -b feature -Dfeature_set_10_xyz,feature_set_100_qpr,feature_set_90m_ijk,feature_unset_abc

Implementation:

bundle agent feature
{
  classes:
      "parsed_$(on)" expression => regextract("feature_set_([0-9]+[kmgKMG]?)_(.*)",
                                              $(on),
                                              "extract_$(on)");

      "parsed_$(off)" expression => regextract("feature_unset_(.*)",
                                               $(off),
                                               "extract_$(off)");

      "$(extract_$(on)[2])" expression => "parsed_$(on)",
      persistence => "$(extract_$(on)[1])";

  vars:
      "on" slist => classesmatching("feature_set_.*");
      "off" slist => classesmatching("feature_unset_.*");

      "_$(off)" string => "off", classes => feature_cancel("$(extract_$(off)[1])");

  reports:
    "DEBUG|DEBUG_$(this.bundle)"::
      "DEBUG $(this.bundle): $(on) => SET class '$(extract_$(on)[2]) for '$(extract_$(on)[1])'"
      ifvarclass => "parsed_$(on)";

      "DEBUG $(this.bundle): $(off) => UNSET class '$(extract_$(off)[1])'"
      ifvarclass => "parsed_$(off)";

      "DEBUG $(this.bundle): have $(extract_$(on)[2])" ifvarclass => "$(extract_$(on)[2])";
      "DEBUG $(this.bundle): have no $(extract_$(on)[2])" ifvarclass => "!$(extract_$(on)[2])";

      "DEBUG $(this.bundle): have $(extract_$(off)[1])" ifvarclass => "$(extract_$(off)[1])";
      "DEBUG $(this.bundle): have no $(extract_$(off)[1])" ifvarclass => "!$(extract_$(off)[1])";
}

feature_test

Prototype: feature_test

Description: Finds feature_set_X and feature_unset_X classes and reports X

Note that this bundle is intended to be used exactly like feature and just show what's defined or undefined.

Example: Check classes xyz, qpr, ijk, and abc. cf-agent -I -f ./feature.cf -b feature_test -Dfeature_set_10_xyz,feature_set_100_qpr,feature_set_90m_ijk,feature_unset_abc

Implementation:

bundle agent feature_test
{
  classes:
      "parsed_$(on)" expression => regextract("feature_set_([0-9]+[kmgKMG]?)_(.*)",
                                              $(on),
                                              "extract_$(on)");

      "parsed_$(off)" expression => regextract("feature_unset_(.*)",
                                               $(off),
                                               "extract_$(off)");

  vars:
      "on" slist => classesmatching("feature_set_.*");
      "off" slist => classesmatching("feature_unset_.*");

  reports:
      "$(this.bundle): have $(extract_$(on)[2])" ifvarclass => "$(extract_$(on)[2])";
      "$(this.bundle): have no $(extract_$(on)[2])" ifvarclass => "!$(extract_$(on)[2])";

      "$(this.bundle): have $(extract_$(off)[1])" ifvarclass => "$(extract_$(off)[1])";
      "$(this.bundle): have no $(extract_$(off)[1])" ifvarclass => "!$(extract_$(off)[1])";
}

classes bodies

feature_cancel

Prototype: feature_cancel(x)

Description: Undefine class x when promise is kept or repaired Used internally by bundle feature

Arguments:

Implementation:

body classes feature_cancel(x)
{
      cancel_kept => { "$(x)" };
      cancel_repaired => { "$(x)" };
}