nix: add derivation for bitcoind

mmgen/data/version

@@ -1 +1 @@
-16.1.dev6
+16.1.dev7

nix/bitcoin.nix

@@ -0,0 +1,80 @@
+{
+    lib,
+    stdenv,
+    cmake,
+    capnproto,
+    pkg-config,
+    darwin,
+    boost,
+    libevent,
+    zeromq,
+    zlib,
+    sqlite,
+}:
+
+stdenv.mkDerivation (finalAttrs: {
+    pname = "bitcoind";
+    version = "30.0";
+
+    src = fetchGit {
+        url = "https://github.com/bitcoin/bitcoin.git";
+        # url = /path/to/repo/bitcoin-30.0;
+        ref = "refs/tags/v${finalAttrs.version}";
+        shallow = true;
+    };
+
+    nativeBuildInputs = [
+        cmake
+        capnproto
+        pkg-config
+    ]
+    ++ lib.optionals (stdenv.hostPlatform.isDarwin && stdenv.hostPlatform.isAarch64) [
+        darwin.autoSignDarwinBinariesHook
+    ];
+
+    buildInputs = [
+        boost
+        libevent
+        zeromq
+        zlib
+        sqlite
+    ];
+
+    cmakeFlags = [
+        (lib.cmakeBool "BUILD_BENCH" false)
+        (lib.cmakeBool "WITH_ZMQ" true)
+        (lib.cmakeBool "BUILD_TESTS" false)
+        (lib.cmakeBool "BUILD_FUZZ_BINARY" false)
+    ];
+
+    NIX_LDFLAGS = lib.optionals (
+        stdenv.hostPlatform.isLinux && stdenv.hostPlatform.isStatic
+    ) "-levent_core";
+
+    doCheck = false;
+
+    enableParallelBuilding = true;
+
+    __darwinAllowLocalNetworking = true;
+
+    doInstallCheck = false;
+
+    meta = {
+        description = "Peer-to-peer electronic cash system";
+        longDescription = ''
+            Bitcoin is a free open source peer-to-peer electronic cash system that is
+            completely decentralized, without the need for a central server or trusted
+            parties. Users hold the crypto keys to their own money and transact directly
+            with each other, with the help of a P2P network to check for double-spending.
+        '';
+        homepage = "https://bitcoin.org/en/";
+        downloadPage = "https://bitcoincore.org/bin/bitcoin-core-${finalAttrs.version}/";
+        changelog = "https://bitcoincore.org/en/releases/${finalAttrs.version}/";
+        maintainers = with lib.maintainers; [
+            prusnak
+            roconnor
+        ];
+        license = lib.licenses.mit;
+        platforms = lib.platforms.unix;
+    };
+})

nix/packages.nix

@@ -2,7 +2,7 @@
 
 {
     system-packages = with pkgs; {
-        bitcoind     = bitcoind;                        # Bitcoin Core daemon
+        bitcoind     = (callPackage ./bitcoin.nix {});            # Bitcoin Core daemon
         vanitygen    = (callPackage ./vanitygen-plusplus.nix {}); # test suite
         curl         = curl;
         git          = git;