output.txt

cf-agent -KIf ./test_getindices_dynamic_array.cf
 !! Duplicate selection of value for variable "idx" in scope example0
 !! Rule from ./test_getindices_dynamic_array.cf at/before line 28
 !! Duplicate selection of value for variable "idx" in scope example0
 !! Rule from ./test_getindices_dynamic_array.cf at/before line 28
R: example0 item1
R: example0 item2
R: example0 item3
R: example1 item1
R: example1 item2
R: example1 item3
R: example2 item1
R: example2 item2
R: example2 item3

test_getindices_dynamic_array.cf

body common control
{

  bundlesequence => {
                      "example0",
                      "example1",
                      "example2",
                    };
}

bundle agent example0
# This pattern was shared on the CFEngine help mailing list by cyril
# Thanks!
{
  vars:
      "list" slist => { "1", "2", "3" };

      # Autogenerate an array instead of typing it out
      # "array[item1]" string => "value1";
      # "array[item2]" string => "value2";
      # "array[item3]" string => "value3";
      "array[item$(list)]" string => "value$(list)";

    !idx_defined::
      "idx"
        slist => { getindices("array") },
        handle => "$(this.bundle)_get_array_index";

  classes:
      "idx_defined" expression => isvariable("idx");

  reports:
    cfengine::
      # should report 3 times itemx where x is a list value
      "$(this.bundle) $(idx)";

}


bundle agent example1
# This pattern was shared on the CFEngine help mailing list by cyril
# Thanks!
{
  vars:
      "list" slist => { "1", "2", "3" };

      # Autogenerate an array instead of typing it out
      # "array[item1]" string => "value1";
      # "array[item2]" string => "value2";
      # "array[item3]" string => "value3";
      "array[item$(list)]" string => "value$(list)";

    list_defined.!idx_defined::
      "idx"
        slist => { getindices("array") },
        handle => "$(this.bundle)_get_array_index";

  classes:
      "list_defined"
        expression => isvariable("list"),
        comment    => "This is one way to work around 'Duplicate selection of
                       value for variable' messages. Your forcing get_array_index
                       to not be evaluated until the next pass";

      "idx_defined" expression => isvariable("idx");

  reports:
    cfengine::
      # should report 3 times itemx where x is a list value
      "$(this.bundle) $(idx)";

}

bundle agent example2
# This pattern was shared on the CFEngine help mailing list by cyril
# Thanks!
{
  vars:
      "list" slist => { "1", "2", "3" };

      # Autogenerate an array instead of typing it out
      # "array[item1]" string => "value1";
      # "array[item2]" string => "value2";
      # "array[item3]" string => "value3";
      "array[item$(list)]" string => "value$(list)";

    !idx_defined::
      "idx"
        slist   => { getindices("array") },
        policy  => "free",
        handle  => "$(this.bundle)_get_array_index",
        comment => "Setting policy free is another way to suppress 'Duplicate
                    selection of value for variable' messages.";

  classes:
      "idx_defined" expression => isvariable("idx");

  reports:
    cfengine::
      # should report 3 times itemx where x is a list value
      "$(this.bundle) $(idx)";

}