Fantom blockchain (#26)

Adds the `go-opera` package.

Author: monyarm

overlay.nix

@@ -36,6 +36,8 @@ _finalNixpkgs: prevNixpkgs: let
   erdpy = prevNixpkgs.callPackage ./packages/erdpy/default.nix {};
   elrond-go = prevNixpkgs.callPackage ./packages/elrond-go/default.nix {};
   elrond-proxy-go = prevNixpkgs.callPackage ./packages/elrond-proxy-go/default.nix {};
+
+  go-opera = prevNixpkgs.callPackage ./packages/go-opera/default.nix {};
 in {
   metacraft-labs = rec {
     solana = solana-full-sdk;
@@ -50,5 +52,6 @@ in {
     inherit cattrs22-2;
     inherit elrond-go;
     inherit elrond-proxy-go;
+    inherit go-opera;
   };
 }

packages/go-opera/default.nix

@@ -0,0 +1,34 @@
+{pkgs}:
+with pkgs;
+  buildGoModule rec {
+    pname = "go-opera";
+    version = "1.1.1-rc.2";
+
+    src = fetchgit {
+      url = "https://github.com/Fantom-foundation/go-opera";
+      rev = "v${version}";
+      sha256 = "sha256-OoDjbCKUoWsZ6jfzmeCwDyvuo28H9YMXxPTRTJOsBcU=";
+    };
+
+    karalabe-usb = fetchgit {
+      url = "https://github.com/karalabe/usb";
+      rev = "v0.0.2";
+      sha256 = "sha256-liXTgMnA0W5CwfOkqaVLdWmDdBK+7DSWLQZuSLVOt6w=";
+    };
+    doCheck = false;
+    buildInputs = [gcc-unwrapped];
+    CGO_CFLAGS = "-I${karalabe-usb} -I${karalabe-usb}/hidapi/hidapi -I${karalabe-usb}/libusb/libusb";
+
+    # GIT_COMMIT = "e529a4e7317e2f02e284c194677b301bb640cd73";
+    # GIT_DATE = "1669028682";
+    # ldflags = "-s -w -X github.com/Fantom-foundation/go-opera/cmd/opera/launcher.gitCommit=$${GIT_COMMIT} -X github.com/Fantom-foundation/go-opera/cmd/opera/launcher.gitDate=$${GIT_DATE}";
+
+    vendorSha256 = "sha256-fRMMjPFyFpFbN/NRzi1KBwwMZsu6DFrVwRPsBW3J6uU=";
+    modSha256 = lib.fakeSha256;
+
+    meta = with lib; {
+      description = "Opera blockchain protocol secured by the Lachesis consensus algorithm ";
+      homepage = "https://github.com/Fantom-foundation/go-opera";
+      license = licenses.lgpl3;
+    };
+  }

shell.nix

@@ -13,6 +13,7 @@ with pkgs;
         metacraft-labs.cosmos-theta-testnet
         metacraft-labs.circom
         metacraft-labs.circ
+        metacraft-labs.go-opera
       ]
       ++ lib.optionals (!stdenv.isDarwin) [
         # Solana is still not compatible with macOS on M1