From 4d371a93fe6d40521b590b738f2c5f656229c5b8 Mon Sep 17 00:00:00 2001
From: Christian Hoener zu Siederdissen <christian.hoener@iohk.io>
Date: Fri, 21 Nov 2025 18:51:31 +0100
Subject: [PATCH] Adds explicit "systems" input to flake.nix

* Enables building on supported architectures.
* Prevents github from breaking due to unsupported systems by limiting
  the nix flake check to the current system architecture.

Fixes #103
---
 .github/workflows/ci-nix.yaml |  4 ++--
 flake.lock                    | 18 +++++++++++++++++-
 flake.nix                     |  6 ++++--
 3 files changed, 23 insertions(+), 5 deletions(-)

diff --git a/.github/workflows/ci-nix.yaml b/.github/workflows/ci-nix.yaml
index 07d6f820..b242d8f4 100644
--- a/.github/workflows/ci-nix.yaml
+++ b/.github/workflows/ci-nix.yaml
@@ -55,6 +55,6 @@ jobs:
         nix build --accept-flake-config .#cip-143-cli
         nix build --accept-flake-config .#regulated-stablecoin-cli
     - name: nix flake check
-      run: nix flake --accept-flake-config check
+      run: nix flake check --accept-flake-config --override-input systems github:nix-systems/$(nix eval --impure --raw --expr 'builtins.currentSystem')
     - name: Check aiken
-      run: nix develop --accept-flake-config --command bash -c "cd src/examples/aiken/aiken && aiken build && aiken check"
\ No newline at end of file
+      run: nix develop --accept-flake-config --command bash -c "cd src/examples/aiken/aiken && aiken build && aiken check"
diff --git a/flake.lock b/flake.lock
index 587574af..063cdb32 100644
--- a/flake.lock
+++ b/flake.lock
@@ -1745,7 +1745,8 @@
         "nixpkgs": [
           "haskell-nix",
           "nixpkgs"
-        ]
+        ],
+        "systems": "systems_7"
       }
     },
     "rust-overlay": {
@@ -1971,6 +1972,21 @@
         "repo": "default",
         "type": "github"
       }
+    },
+    "systems_7": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
     }
   },
   "root": "root",
diff --git a/flake.nix b/flake.nix
index c8193199..a4acef8e 100644
--- a/flake.nix
+++ b/flake.nix
@@ -43,13 +43,15 @@
       url = "github:aiken-lang/aiken/v1.1.16";
       inputs.nixpkgs.follows = "nixpkgs";
     };
+
+    systems.url = "github:nix-systems/default";
   };
 
-  outputs = inputs: inputs.iogx.lib.mkFlake {
+  outputs = inputs@{systems, ...}: inputs.iogx.lib.mkFlake {
     inherit inputs;
     repoRoot = ./.;
     outputs = import ./nix/outputs.nix;
-    systems = [ "x86_64-linux" ]; # "x86_64-darwin" ];
+    systems = (import systems);
   };
 
   nixConfig = {