FIX nix-serve: migrate to a package built against older nix

flake.lock

@@ -31,6 +31,39 @@
         "type": "github"
       }
     },
+    "nix-serve": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      },
+      "locked": {
+        "lastModified": 1675958846,
+        "narHash": "sha256-/nf09eM2vey9GrAXoqagccJrBo/fGyVKP7oNSxPqwdo=",
+        "owner": "edolstra",
+        "repo": "nix-serve",
+        "rev": "7089565e260267c9c234a81292c841958737cef6",
+        "type": "github"
+      },
+      "original": {
+        "owner": "edolstra",
+        "repo": "nix-serve",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1606086654,
+        "narHash": "sha256-VFl+3eGIMqNp7cyOMJ6TjM/+UcsLKtodKoYexrlTJMI=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "19db3e5ea2777daa874563b5986288151f502e27",
+        "type": "github"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "ref": "nixos-20.09",
+        "type": "indirect"
+      }
+    },
     "nixpkgs-stable": {
       "locked": {
         "lastModified": 1676162277,
@@ -66,6 +99,7 @@
     "root": {
       "inputs": {
         "mobile-nixos": "mobile-nixos",
+        "nix-serve": "nix-serve",
         "nixpkgs-unpatched": "nixpkgs-unpatched",
         "sops-nix": "sops-nix",
         "uninsane-dot-org": "uninsane-dot-org"

flake.nix

@@ -45,6 +45,10 @@
       # inputs.nixpkgs.follows = "nixpkgs";
       inputs.nixpkgs.follows = "nixpkgs-unpatched";
     };
+    nix-serve = {
+      # <https://github.com/edolstra/nix-serve>
+      url = "github:edolstra/nix-serve";
+    };
   };
 
   outputs = {
@@ -53,6 +57,7 @@
     mobile-nixos,
     sops-nix,
     uninsane-dot-org,
+    nix-serve,
     ...
   }@inputs:
     let
@@ -164,9 +169,20 @@
               ) else (next: prev: {});
             mobile = (import "${mobile-nixos}/overlay/overlay.nix");
             uninsane = uninsane-dot-org.overlay;
+            # nix-serve' = nix-serve.overlay;
+            nix-serve' = next: prev: {
+              # XXX(2023/03/02): upstream isn't compatible with modern `nix`. probably the perl bindings.
+              # - we use the package built against `nixpkgs` specified in its flake rather than use its overlay,
+              #   to get around this.
+              inherit (nix-serve.packages."${next.system}") nix-serve;
+            };
           in
             next: prev:
-              (stable next prev) // (mobile next prev) // (uninsane next prev);
+              (stable next prev)
+              // (mobile next prev)
+              // (uninsane next prev)
+              // (nix-serve' next prev)
+            ;
       };
 
       nixosModules = rec {