I'm using the following expressions to generate some DHCP & DNS config.
These work, but I fear I'm perhaps missing out on the use of some other functions available in the stdlib that could do this a bit "nicer".
I could let slurp = a: b: builtins.toString (catAttrs "${a}" (singleton b)) to trim it down a bit.
But I was wondering if anyone had any advice on how to write these better?
| { config, pkgs, lib, ... }: | |
| let | |
| domain = "my.tld"; | |
| ipReservations = { | |
| compute1.ip = "10.0.10.1"; | |
| compute1.mac = "b8:ae:ed:7d:1b:7e"; | |
| compute2.ip = "10.0.10.2"; | |
| compute2.mac = "b8:ae:ed:7d:19:06"; | |
| compute3.ip = "10.0.10.3"; | |
| compute3.mac = "b8:ae:ed:7d:1a:09"; | |
| ps4.ip = "10.0.1.3"; | |
| ps4.mac = "f8:46:1c:39:f4:97"; | |
| xbox.ip = "10.0.1.4"; | |
| xbox.mac = "98:5f:d3:f6:87:b1"; | |
| }; | |
| in with lib; { | |
| /* This yeilds a list like this: | |
| * | |
| * [ | |
| * { | |
| * hostName = "compute1.my.tld"; | |
| * ethernetAddress = "b8:ae:ed:7d:1b:7e"; | |
| * ipAddress = "10.0.10.1"; | |
| * } | |
| * { | |
| * hostName = "compute2.my.tld"; | |
| * ethernetAddress = "b8:ae:ed:7d:19:06"; | |
| * ipAddress = "10.0.10.2"; | |
| * } | |
| * { | |
| * hostName = "compute3.my.tld"; | |
| * ethernetAddress = "b8:ae:ed:7d:1a:09"; | |
| * ipAddress = "10.0.10.3"; | |
| * } | |
| * { | |
| * hostName = "ps4.my.tld"; | |
| * ethernetAddress = "f8:46:1c:39:f4:97"; | |
| * ipAddress = "10.0.1.3"; | |
| * } | |
| * | |
| * { | |
| * hostName = "xbox.my.tld"; | |
| * ethernetAddress = "98:5f:d3:f6:87:b1"; | |
| * ipAddress = "10.0.1.4"; | |
| * } | |
| * ] | |
| */ | |
| machines = mapAttrsToList (machine: attributes: | |
| { | |
| hostName = "${machine}.${domain}"; | |
| ethernetAddress = builtins.toString (catAttrs "mac" (singleton attributes)); | |
| ipAddress = builtins.toString (catAttrs "ip" (singleton attributes)); | |
| } | |
| ) ipReservations; | |
| /* This yeilds a string like this: | |
| * | |
| * local-data: "compute1.my.tld. IN A 10.0.10.1" | |
| * local-data: "compute2.my.tld. IN A 10.0.10.2" | |
| * local-data: "compute3.my.tld. IN A 10.0.10.3" | |
| * local-data: "ps4.my.tld. IN A 10.0.1.3" | |
| * local-data: "xbox.my.tld. IN A 10.0.1.4" | |
| */ | |
| someDnsConfig = '' | |
| ${concatStringsSep "\n" | |
| (mapAttrsToList (name: attributes: | |
| ''local-data: "${name}.${domain}. IN A ${builtins.toString (catAttrs "ip" (singleton attributes))}"'' | |
| ) ipReservations) | |
| } | |
| ''; | |
| } |
Some advice from tilpner on #nixos 🙏