John Sanders 
shared a pattern for canonifying lists in #CFEngine on irc.freenode.net yesterday. It’s a useful reference so I thought I would replicate it here.
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<pre class="line-pre"><div class="line" id="file-example_canonify_list-cf-LC1">
body common control
{
bundlesequence => { "main" };
inputs => { "cfengine_stdlib.cf", };
}
bundle agent main
{
vars:
"apache_config[www.example.com][DocumentRoot]" string => "/var/www/www.example.com";
"apache_config[www.example.com][ServerAdmin]" string => "webmaster@example2.com";
"apache_config[www.example2.com][DocumentRoot]" string => "/var/www/www.example2.com";
"apache_config[www.example2.com][ServerAdmin]" string => "webmaster@example3.com";
methods:
"Testing" usebundle => test("main.apache_config");
}
bundle agent test(config)
{
vars:
# build a list from the first index on the config array
"site_names" slist => getindices("$(config)");
# Build a new array mapping the original index to a canonified version of itself
"site_names_canonified_map[$(site_names)]" string => canonify("$(site_names)");
# Build a list of just the canonified versions
"site_names_canonified_list" slist => maplist("$(site_names_canonified_map[$(this)])", "site_names");
# alternate way to build list of canonified values
# due to a bug in the way getindices/getvalues works this needs to happen on the pass after the map array is generated
"site_names_canonified_list2" slist => getvalues("site_names_canonified_map"), policy => "free";
reports:
cfengine::
"canonified site: $(site_names_canonified_list)";
"alternate canonified site: $(site_names_canonified_list2)";
}
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