From 69d5289a2b95ee75ec5da43a0ef2821594486b6b Mon Sep 17 00:00:00 2001
From: Boris Nagaev <bnagaev@gmail.com>
Date: Fri, 7 Nov 2025 00:07:08 -0300
Subject: [PATCH] add Nix dev shell

Make it easier to get all the dependencies on Nix system.
---
 README.md  |  4 +++-
 flake.lock | 61 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 flake.nix  | 41 ++++++++++++++++++++++++++++++++++++
 3 files changed, 105 insertions(+), 1 deletion(-)
 create mode 100644 flake.lock
 create mode 100644 flake.nix

diff --git a/README.md b/README.md
index 838232c..7ca06e0 100644
--- a/README.md
+++ b/README.md
@@ -35,6 +35,8 @@ cd go-bitcoinkernel
 
 ### Step 2: Build the Native Library
 
+On Nix: `nix develop` to get all the build and runtime dependencies.
+
 ```bash
 make build-kernel
 ```
@@ -96,4 +98,4 @@ The library uses structured error types for better error handling (see [errors.g
 
 ### Runtime Dependencies
 
-Your Go application will have a runtime dependency on the shared `libbitcoinkernel` library produced by `make build-kernel` in `/path/to/go-bitcoinkernel/depend/bitcoin/build`. Do not delete or move these built library files as your application needs them to run.
\ No newline at end of file
+Your Go application will have a runtime dependency on the shared `libbitcoinkernel` library produced by `make build-kernel` in `/path/to/go-bitcoinkernel/depend/bitcoin/build`. Do not delete or move these built library files as your application needs them to run.
diff --git a/flake.lock b/flake.lock
new file mode 100644
index 0000000..ee10cae
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,61 @@
+{
+  "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1731533236,
+        "narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "11707dc2f618dd54ca8739b309ec4fc024de578b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1762111121,
+        "narHash": "sha256-4vhDuZ7OZaZmKKrnDpxLZZpGIJvAeMtK6FKLJYUtAdw=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "b3d51a0365f6695e7dd5cdf3e180604530ed33b4",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "b3d51a0365f6695e7dd5cdf3e180604530ed33b4",
+        "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
+}
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000..b6cb56a
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,41 @@
+{
+  description = "Development shell for go-bitcoinkernel";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/b3d51a0365f6695e7dd5cdf3e180604530ed33b4";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = { self, nixpkgs, flake-utils }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        pkgs = import nixpkgs {
+          inherit system;
+        };
+        nativeDeps = with pkgs; [
+          cmake
+          ninja
+          pkg-config
+          go
+          python3
+          git
+        ];
+        runtimeDeps = with pkgs; [
+          boost
+          libevent
+          zlib
+        ];
+      in
+      {
+        devShells.default = pkgs.mkShell {
+          nativeBuildInputs = nativeDeps;
+          buildInputs = runtimeDeps;
+          shellHook = ''
+            export PKG_CONFIG_PATH=${pkgs.lib.makeSearchPath "lib/pkgconfig" runtimeDeps}''${PKG_CONFIG_PATH:+:$PKG_CONFIG_PATH}
+            export LD_LIBRARY_PATH=${pkgs.lib.makeLibraryPath runtimeDeps}''${LD_LIBRARY_PATH:+:$LD_LIBRARY_PATH}
+            export CGO_CFLAGS="-I${pkgs.lib.makeIncludePath runtimeDeps}''${CGO_CFLAGS:+ ''${CGO_CFLAGS}}"
+            export CGO_LDFLAGS="-L${pkgs.lib.makeLibraryPath runtimeDeps}''${CGO_LDFLAGS:+ ''${CGO_LDFLAGS}}"
+          '';
+        };
+      });
+}