Re: Ridding unpredictable predictable interface names

Martin Simons <[email protected]> writes:


> Dear CFEngineer, At times one needs a dirty trick.


Hey Martin,

I tweaked your policy slightly to collect the map back into a classic
array leveraging `useresult' and `bundle_return_value_index':

,----
| bundle agent __main__
| {
|   methods:
|       "nic_mac_map";
| }
| bundle agent nic_mac_map {
| vars:
| 
|  "macs"                              slist => { "52:54:00:40:13:98", "52:54:00:40:13:99", "52:54:00:40:13:9a" };
|  "macs_string"                      string => join(",", "macs");
|  "mac_list_len"                        int => length("macs");
| 
|  "nic[support]"                     string => "eth1";
|  "nic[admin]"                       string => "eth2";
|  "nic[life]"                        string => "eth5";
| 
|  "nics"                              slist => getvalues("nic");
|  "nics_sort"                         slist => sort("nics", lex);
|  "nics_string"                      string => join(",", "nics_sort");
| 
|  "dirty_trick"                       slist => { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9" };
| 
| methods:
| 
|       "map nics and macs"
|         usebundle => ugly_policy($(dirty_trick)),
|         useresult => "nic2mac_map";
| 
| reports:
| 
|  # "$(this.bundle) macs sort: $(macs)";
|  # "$(this.bundle) macs length: $(mac_list_len)";
|  # "$(this.bundle) nics_sort: $(nics_sort)";
| 
| }
| 
| bundle agent ugly_policy (pos) {
| vars:
| 
|  "nic"                              string => nth("nic_mac_map.nics_sort", "$(pos)");
|  "mac"                              string => nth("nic_mac_map.macs", "$(pos)");
| 
| reports:
| 
| #      "$(this.bundle) pair : $(nic), $(mac)";
|       "$(mac)"
|         bundle_return_value_index => "$(nic)";
| }
`----
Listing 1: Example Policy

,----
| # cf-agent --no-lock --log-level info --show-evaluated-vars=default:nic_mac_map\\.nic2mac_map --file /tmp/martin-nic2mac-map.cf
| Variable name                            Variable value                                               Meta tags                                Comment                                 
| default:nic_mac_map.nic2mac_map[eth1]    52:54:00:40:13:98                                            source=bundle                                                                    
| default:nic_mac_map.nic2mac_map[eth2]    52:54:00:40:13:99                                            source=bundle                                                                    
| default:nic_mac_map.nic2mac_map[eth5]    52:54:00:40:13:9a                                            source=bundle                                                                    
`----

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-- 
Nick Anderson | Doer of Things | (+1) 785-550-1767 | https://northern.tech

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