fix: build staticly linked against musl

Author: trickypr

flake.lock

@@ -8,9 +8,9 @@
       url = "github:oxalica/rust-overlay";
       inputs.nixpkgs.follows = "nixpkgs";
     };
-    crane = {
-      url = "github:ipetkov/crane";
-    };
+
+    fenix.url = "github:nix-community/fenix";
+    naersk.url = "github:nix-community/naersk";
   };
 
   outputs =
@@ -19,7 +19,8 @@
       nixpkgs,
       rust-overlay,
       flake-utils,
-      crane,
+      naersk,
+      fenix,
       ...
     }:
     flake-utils.lib.eachDefaultSystem (
@@ -31,13 +32,24 @@
         pkgs = import nixpkgs {
           inherit system overlays;
         };
-        craneLib = crane.mkLib pkgs;
+        toolchain =
+          with fenix.packages.${system};
+          combine [
+            minimal.rustc
+            minimal.cargo
+            targets.x86_64-unknown-linux-musl.latest.rust-std
+          ];
+
+        naersk' = naersk.lib.${system}.override {
+          cargo = toolchain;
+          rustc = toolchain;
+        };
       in
       {
         packages = rec {
           bin = package {
             inherit pkgs;
-            craneLib = craneLib;
+            naersk = naersk';
           };
           docker = docker-image {
             inherit pkgs;

flake.nix

@@ -1,9 +1,22 @@
-{ craneLib, pkgs, ... }:
-craneLib.buildPackage rec {
+{ naersk, pkgs, ... }:
+naersk.buildPackage rec {
   pname = "rubric-merge";
   name = pname;
-  src = craneLib.cleanCargoSource ../.;
+  src = ../.;
+  strictDeps = true;
 
-  nativeBuildInputs = with pkgs; [ pkg-config ];
-  buildInputs = with pkgs; [ openssl ];
+  OPENSSL_STATIC = "1";
+  OPENSSL_LIB_DIR = "${pkgs.pkgsStatic.openssl.out}/lib";
+  OPENSSL_INCLUDE_DIR = "${pkgs.pkgsStatic.openssl.dev}/include";
+
+  CARGO_BUILD_TARGET = "x86_64-unknown-linux-musl";
+  CARGO_BUILD_RUSTFLAGS = [
+    "-C"
+    "target-feature=+crt-static"
+
+    # -latomic is required to build openssl-sys for armv6l-linux, but
+    # it doesn't seem to hurt any other builds.
+    # "-C"
+    # "link-args=-static -latomic"
+  ];
 }