From 227a1d7db7b7c1d470d31e6c50112f54f353c2f1 Mon Sep 17 00:00:00 2001
From: Sebastian Nagel <sebastian.nagel@ncoding.at>
Date: Wed, 29 Sep 2021 21:33:45 +0200
Subject: [PATCH] Add a shell.nix and instructions how to use it

---
 README.md     |  5 +++++
 libsodium.nix | 14 ++++++++++++++
 shell.nix     |  7 +++++++
 3 files changed, 26 insertions(+)
 create mode 100644 libsodium.nix
 create mode 100644 shell.nix

diff --git a/README.md b/README.md
index 8c142ae..2a08599 100644
--- a/README.md
+++ b/README.md
@@ -20,6 +20,11 @@ make
 ./musig2test
 ```
 
+## Build in nix-shell
+
+The provided `shell.nix` provides build tools and the right version of
+`libsodium`, so simply using `nix-shell` and `make` is sufficient to build.
+
 # Disclaimer
 This code is work in progress, and has not been audited. Do not use in production. 
 
diff --git a/libsodium.nix b/libsodium.nix
new file mode 100644
index 0000000..32513da
--- /dev/null
+++ b/libsodium.nix
@@ -0,0 +1,14 @@
+{ pkgs ? import <nixpkgs> {} }:
+
+pkgs.libsodium.overrideAttrs (oldAttrs: {
+    name = "libsodium-1.0.18-musig2";
+    src = pkgs.fetchFromGitHub {
+      owner = "input-output-hk";
+      repo = "libsodium";
+      # branch musig2_compat
+      rev = "7f9f211fcc88d8f0d7a821e5b9041268c392300a";
+      sha256 = "0527x23z1h4ny492jjmyxpwb48hrlbgibin83w1qm0jqvg441xgp";
+    };
+    nativeBuildInputs = [ pkgs.autoreconfHook ];
+    configureFlags = "--enable-static";
+  })
diff --git a/shell.nix b/shell.nix
new file mode 100644
index 0000000..6f20405
--- /dev/null
+++ b/shell.nix
@@ -0,0 +1,7 @@
+{ pkgs ? import <nixpkgs> {}
+, libsodium-musig2 ? import ./libsodium.nix { inherit pkgs; }
+}:
+
+pkgs.mkShell {
+  buildInputs = [pkgs.clang libsodium-musig2];
+}