Add nix flake

flake.lock

@@ -0,0 +1,60 @@
+{
+  "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1689068808,
+        "narHash": "sha256-6ixXo3wt24N/melDWjq70UuHQLxGV8jZvooRanIHXw0=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "919d646de7be200f3bf08cb76ae1f09402b6f9b4",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1691807049,
+        "narHash": "sha256-LEvnZFLkyiJUBWfu8FGYhlW0iFXau99pt0d1rR5XGXQ=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "e35d8c2b1b0b3ae614b246f66ad0a914ceae4e72",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      }
+    },
+    "systems": {
+      "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",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,47 @@
+{
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = { self, nixpkgs, flake-utils }:
+    let 
+      productVersion = "0.4.1";
+      productName = "blockstream-electrs-${productVersion}";
+    in
+    flake-utils.lib.eachDefaultSystem (system:
+      with nixpkgs.legacyPackages.${system}; {
+        packages.${productName} = rustPlatform.buildRustPackage {
+          name = "${productName}";
+          version = "${productVersion}";
+
+          src = lib.cleanSource ./.;
+
+          cargoSha256 = "sha256-d84QNj9SIRUwtlsa9sdYKuYf0oCptdGm7pDs3eGTcBg=";
+
+          preConfigure = ''
+            export LIBCLANG_PATH="${llvmPackages.libclang.lib}/lib";
+          '';
+          nativeBuildInputs = [ cargo clang cmake ];
+        };
+
+        defaultPackage = self.packages.${system}.${productName};
+
+        devShell = mkShell {
+          inputsFrom = builtins.attrValues self.packages.${system};
+
+          shellHook = ''
+            export LIBCLANG_PATH="${llvmPackages.libclang.lib}/lib"
+          '';
+          # LIBCLANG_PATH="${llvmPackages.libclang.lib}/lib";
+
+          # I'm never quite sure which one to use, but in this case neither
+          # result in a proper dev shell
+          buildInputs = [ cargo ];
+          nativeBuildInputs = [ cargo clang ];
+        };
+
+        modules.${productName} = import [ ./module.nix ];
+        defaultModule = self.modules.${system}.${productName};
+      });
+}