Custom octodns setup!

modules/common/octodns.nix

@@ -0,0 +1,46 @@
+{ config, pkgs, lib, ... }:
+let
+  format = pkgs.formats.yaml { };
+  cfg = config.satellite.dns;
+in
+{
+  options.satellite.dns.octodns = lib.mkOption {
+    description = "Derivation building a directory containing all the zone files";
+    type = lib.types.path;
+  };
+
+  config.satellite.dns.octodns =
+    let
+      grouped = builtins.groupBy (entry: entry.zone) cfg.records;
+      cpLines = lib.mapAttrsToList
+        (zone: group:
+          let
+            grouped = builtins.groupBy (entry: entry.at) group;
+            contents = lib.mapAttrs
+              (at: entries: lib.lists.forEach entries
+                (entry:
+                  let
+                    content =
+                      if builtins.typeOf entry.value == "list"
+                      then { values = entry.value; }
+                      else { inherit (entry) value; };
+                    cloudflare =
+                      if entry.enableCloudflareProxy then {
+                        octodns.cloudflare.proxied = true;
+                      } else { };
+                  in
+                  { inherit (entry) ttl type; }
+                  // content // cloudflare
+                ))
+              grouped;
+            file = format.generate "${zone}.yaml" contents;
+          in
+          "cp ${file} $out/${zone}.yaml"
+        )
+        grouped;
+    in
+    pkgs.runCommand "octodns-zones" { } ''
+      mkdir $out
+      ${lib.concatStringsSep "\n" cpLines}
+    '';
+}