chore(nix): remove unneeded circuit files (#2936)

flake.lock

@@ -30,6 +30,7 @@
       "original": {
         "owner": "logos-blockchain",
         "repo": "logos-blockchain-circuits",
+        "rev": "2846ee7a4cfa24458bb8063412ab2e753b344d2f",
         "type": "github"
       }
     },
@@ -51,11 +52,11 @@
     },
     "nixpkgs_2": {
       "locked": {
-        "lastModified": 1780749050,
-        "narHash": "sha256-3av0pIjlOWQ6rDbNOmpUSvbNnJkGORQKKjb4LtCZsIY=",
+        "lastModified": 1781074563,
+        "narHash": "sha256-md8WlXOlfnIeHeOScMTTHFyf2d6iaTwPl2apR5EQ3P4=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "a799d3e3886da994fa307f817a6bc705ae538eeb",
+        "rev": "9ae611a455b90cf061d8f332b977e387bda8e1ca",
         "type": "github"
       },
       "original": {

flake.nix

@@ -12,8 +12,13 @@
     crane.url = "github:ipetkov/crane";
 
     # Must stay in sync with the lbc-* tags in Cargo.toml.
+    # Pinned to the commit right after the v0.5.3 tag (127626881faa975aa8e9868422cf6bbb08fcb512):
+    # the tag itself predates the CI job that registers its Nix hashes in
+    # circuits-nix-hashes.json, so building directly off the tag fails with
+    # `attribute '"0.5.3"' missing`. This commit adds that entry without
+    # otherwise changing the source.
     logos-blockchain-circuits = {
-      url = "github:logos-blockchain/logos-blockchain-circuits?tag=v0.5.1";
+      url = "github:logos-blockchain/logos-blockchain-circuits/2846ee7a4cfa24458bb8063412ab2e753b344d2f";
     };
 
     # Must stay in sync with the rust-rapidsnark rev in Cargo.toml.
@@ -95,14 +100,8 @@
               inherit logosBlockchainDependencies;
 
               postInstall = ''
-                mkdir -p $out/circuits $out/include
-                cp -r ${logos-blockchain-circuits.packages.${system}.default}/* $out/circuits/
+                mkdir -p $out/include
                 cp c-bindings/logos_blockchain.h $out/include/
-
-                # Files copied from the Nix store are read-only.
-                # Crane modifies files in $out after install, so they must be writable during the build.
-                # Nix makes the final output read-only again, so this is safe.
-                chmod -R u+w $out/circuits
               '' + pkgs.lib.optionalString pkgs.stdenv.isDarwin ''
                 install_name_tool -id @rpath/liblogos_blockchain.dylib $out/lib/liblogos_blockchain.dylib
               '';