nix: add our own binary cache to flake

Signed-off-by: Jakub Sokołowski <jakub@status.im>

flake.lock

@@ -2,17 +2,17 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1740603184,
-        "narHash": "sha256-t+VaahjQAWyA+Ctn2idyo1yxRIYpaDxMgHkgCNiMJa4=",
+        "lastModified": 1757590060,
+        "narHash": "sha256-EWwwdKLMZALkgHFyKW7rmyhxECO74+N+ZO5xTDnY/5c=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "f44bd8ca21e026135061a0a57dcf3d0775b67a49",
+        "rev": "0ef228213045d2cdb5a169a95d63ded38670b293",
         "type": "github"
       },
       "original": {
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "f44bd8ca21e026135061a0a57dcf3d0775b67a49",
+        "rev": "0ef228213045d2cdb5a169a95d63ded38670b293",
         "type": "github"
       }
     },

flake.nix

@@ -1,9 +1,14 @@
 {
   description = "A flake for building zerokit";
 
+  nixConfig = {
+    extra-substituters = [ "https://nix-cache.status.im/" ];
+    extra-trusted-public-keys = [ "nix-cache.status.im-1:x/93lOfLU+duPplwMSBR+OlY4+mo+dCN7n0mr4oPwgY=" ];
+  };
+
   inputs = {
     # Version 24.11
-    nixpkgs.url = "github:NixOS/nixpkgs?rev=f44bd8ca21e026135061a0a57dcf3d0775b67a49";
+    nixpkgs.url = "github:NixOS/nixpkgs?rev=0ef228213045d2cdb5a169a95d63ded38670b293";
     rust-overlay = {
       url = "github:oxalica/rust-overlay";
       inputs.nixpkgs.follows = "nixpkgs";
@@ -19,11 +24,20 @@
         "i686-windows"
       ];
       forAllSystems = nixpkgs.lib.genAttrs stableSystems;
-      overlays = [
-        (import rust-overlay)
-        (f: p: { inherit rust-overlay; })
-      ];
-      pkgsFor = forAllSystems (system: import nixpkgs { inherit system overlays; });
+
+      pkgsFor = forAllSystems (
+        system: import nixpkgs {
+          inherit system;
+          config = {
+            android_sdk.accept_license = true;
+            allowUnfree = true;
+          };
+          overlays = [
+            (import rust-overlay)
+            (f: p: { inherit rust-overlay; })
+          ];
+        }
+      );
     in rec
     {
       packages = forAllSystems (system: let
@@ -31,9 +45,7 @@
         buildPackage = pkgs.callPackage ./nix/default.nix;
         buildRln = (buildPackage { src = self; project = "rln"; }).override;
       in rec {
-        rln = buildRln {
-          features = "arkzkey";
-        };
+        rln = buildRln { };
 
         rln-linux-arm64 = buildRln {
           target-platform = "aarch64-multiplatform";

nix/default.nix

@@ -4,9 +4,9 @@
   project,
   src ? ../.,
   release ? true,
-  features ? "arkzkey",
   target-platform ? null,
   rust-target ? null,
+  features ? null,
 }:
 
 let
@@ -30,10 +30,12 @@ in rustPlatform.buildRustPackage {
   src = builtins.path { path = src; name = "zerokit"; };
 
   cargoLock = {
-    lockFile = ../Cargo.lock;
+    lockFile = src + "/Cargo.lock";
     allowBuiltinFetchGit = true;
   };
 
+  nativeBuildInputs = [ pkgs.rust-cbindgen ];
+
   doCheck = false;
 
   CARGO_HOME = "/tmp";
@@ -47,11 +49,11 @@ in rustPlatform.buildRustPackage {
   '';
 
   installPhase = ''
-    mkdir -p $out/
-    for file in $(find target -name 'librln.*' | grep -v deps/); do
-      mkdir -p $out/$(dirname $file)
-      cp -r $file $out/$file
-    done
+    set -eu
+    mkdir -p $out/lib
+    find target -type f -name 'librln.*' -not -path '*/deps/*' -exec cp -v '{}' "$out/lib/" \;
+    mkdir -p $out/include
+    cbindgen ${src}/rln -l c > "$out/include/rln.h"
   '';