hosts/bastille: add some actual names to auto-hostname

there's still some possible issues with the script (hence the paranoid `echo` after `hostname`)

Author: mehbark

hosts/bastille/auto-hostname.nix

@@ -1,6 +1,9 @@
 { pkgs, lib, ... }:
 let
-  # TODO: make this like a python script with a list of interfaces in order of preference
+  names = import ./blade-names.nix;
+
+  bash-sets = lib.mapAttrsToList (mac: name: "names['${mac}']='${name}'") names;
+
   auto-hostname = pkgs.writeShellApplication {
     name = "auto-hostname";
 
@@ -15,9 +18,22 @@ let
         mac_file=/sys/class/net/enp0s25/address
       fi
 
-      mac=$(cat $mac_file | tr -d '\r\n ' | tr ':' '-')
+      mac=$(cat $mac_file | tr -d '\r\n ')
+
+      declare -A names
+      ${lib.concatLines bash-sets}
+
+      if [[ -v names[$mac] ]]; then
+        name=''${names[$mac]}
+      else
+        name="node-(echo $mac | tr ':' '-')"
+      fi
+
+      echo "mac:  '$mac'"
+      echo "name: '$name'"
 
-      hostname "blade-$mac"
+      hostname "$name"
+      echo "hostname set to '$(hostname)'"
     '';
   };
 in {

hosts/bastille/blade-names.nix

@@ -1,16 +1,18 @@
-# keep-sorted start
-[
-  "backbiter"
-  "damocles"
-  "durendal"
-  "eyelander"
-  "excalibur"
-  "gram"
-  "gryffindor"
-  "kusanagi"
-  "narsil"
-  "oathbringer"
-  "riptide"
-  "sting"
-]
-# keep-sorted end
+{
+  # TODO: prospit's a special case and won't remain here forever
+  "d8:9e:f3:3e:f9:41" = "prospit";
+
+  "40:f2:e9:c6:65:5f" = "backbiter";
+  "40:f2:e9:c6:69:43" = "damocles";
+  "40:f2:e9:c6:69:67" = "durendal";
+  "40:f2:e9:c6:74:59" = "eyelander";
+  "40:f2:e9:c6:75:f1" = "excalibur";
+  "40:f2:e9:c6:76:21" = "gram";
+
+  "unassigned-0" = "gryffindor";
+  "unassigned-1" = "kusanagi";
+  "unassigned-2" = "narsil";
+  "unassigned-3" = "oathbringer";
+  "unassigned-4" = "riptide";
+  "unassigned-5" = "sting";
+}