use fenix/naersk for nix building, got local x86_64-linux build working

.cargo/config.toml

@@ -1,3 +0,0 @@
-[target.x86_64-unknown-linux-gnu]
-linker = "clang"
-rustflags = ["-C", "link-arg=-fuse-ld=mold"]

.gitignore

@@ -3,4 +3,6 @@
 /pki
 **/*.rs.bk
 *.swp
-/.direnv
+/.direnv
+/.cargo
+/result

default.nix

@@ -1,56 +1,179 @@
-{ system ? builtins.currentSystem, git_version ? null, }:
+{
+  buildSystem ? builtins.currentSystem,
+  targetSystem ? buildSystem,
+  gitVersion ? null,
+  release ? false,
+  features ? null,
+}:
 
 with import ./nix/common.nix;
 
 let
-  pkgs = import pkgsSrc { };
-  compile = import ./nix/compile.nix;
-
-  build_debug_and_release = (target: {
-    debug = (compile {
-      inherit system target git_version pkgsSrc cargo2nixOverlay;
-      release = false;
-    }).workspace.garage { compileMode = "build"; };
-
-    release = (compile {
-      inherit system target git_version pkgsSrc cargo2nixOverlay;
-      release = true;
-    }).workspace.garage { compileMode = "build"; };
-  });
-
-  test = (rustPkgs:
-    pkgs.symlinkJoin {
-      name = "garage-tests";
-      paths =
-        builtins.map (key: rustPkgs.workspace.${key} { compileMode = "test"; })
-        (builtins.attrNames rustPkgs.workspace);
-    });
+  newBuildTarget = {
+    nixPkgsSystem,
+    rustTarget ? nixPkgsSystem,
+    depsBuildBuild ? pkgsCross: [],
+  }: {
+    inherit nixPkgsSystem rustTarget depsBuildBuild;
+  };
 
-in {
-  pkgs = {
-    amd64 = build_debug_and_release "x86_64-unknown-linux-musl";
-    i386 = build_debug_and_release "i686-unknown-linux-musl";
-    arm64 = build_debug_and_release "aarch64-unknown-linux-musl";
-    arm = build_debug_and_release "armv6l-unknown-linux-musleabihf";
+  # centralize per-target configuration in a single place.
+  buildTargets = {
+    "x86_64-linux" = newBuildTarget {
+      nixPkgsSystem = "x86_64-unknown-linux-musl";
+    };
+
+    "i686-linux" = newBuildTarget {
+      nixPkgsSystem = "i686-unknown-linux-musl";
+    };
+
+    "aarch64-linux" = newBuildTarget {
+      nixPkgsSystem = "aarch64-unknown-linux-musl";
+    };
+
+    # Old Raspberry Pi's
+    "armv6l-linux" = newBuildTarget {
+      nixPkgsSystem = "armv6l-unknown-linux-musleabihf";
+      rustTarget = "arm-unknown-linux-musleabihf";
+    };
+
+    "x86_64-windows" = newBuildTarget {
+      nixPkgsSystem = "x86_64-w64-mingw32";
+      rustTarget = "x86_64-pc-windows-gnu";
+      depsBuildBuild = pkgsCross: [
+        pkgsCross.stdenv.cc
+        pkgsCross.windows.pthreads
+      ];
+    };
   };
-  test = {
-    amd64 = test (compile {
-      inherit system git_version pkgsSrc cargo2nixOverlay;
-      target = "x86_64-unknown-linux-musl";
-      features = [
-        "garage/bundled-libs"
-        "garage/k2v"
-        "garage/sled"
+
+  buildTarget = buildTargets.${targetSystem};
+
+  pkgs = import pkgsSrc { system = buildSystem; };
+  pkgsCross = import pkgsSrc {
+    system = buildSystem;
+    crossSystem.config = buildTarget.nixPkgsSystem;
+  };
+
+  rustTarget = buildTarget.rustTarget;
+
+  toolchain = let
+    fenix = import (pkgs.fetchFromGitHub {
+      owner = "nix-community";
+      repo = "fenix";
+      rev = "81ab0b4f7ae9ebb57daa0edf119c4891806e4d3a";
+      hash = "sha256-bZmI7ytPAYLpyFNgj5xirDkKuAniOkj1xHdv5aIJ5GM=";
+    }) {
+      system = buildSystem;
+    };
+
+    mkToolchain = fenixTarget: fenixTarget.toolchainOf {
+      channel = "1.68.2";
+      sha256 = "sha256-4vetmUhTUsew5FODnjlnQYInzyLNyDwocGa4IvMk3DM=";
+    };
+  in
+    fenix.combine [
+      (mkToolchain fenix).rustc
+      (mkToolchain fenix).cargo
+      (mkToolchain fenix.targets.${rustTarget}).rust-std
+    ];
+
+  naersk = let
+    naerskSrc = pkgs.fetchFromGitHub {
+      owner = "nix-community";
+      repo = "naersk";
+      rev = "d9a33d69a9c421d64c8d925428864e93be895dcc";
+      hash = "sha256-e136hTT7LqQ2QjOTZQMW+jnsevWwBpMj78u6FRUsH9I=";
+    };
+  in
+    pkgs.callPackages naerskSrc {
+      cargo = toolchain;
+      rustc = toolchain;
+    };
+
+
+  # TODO build all of these
+  #build_debug_and_release = (target: {
+  #  debug = (compile {
+  #    inherit system target gitVersion pkgsSrc cargo2nixOverlay;
+  #    release = false;
+  #  }).workspace.garage { compileMode = "build"; };
+
+  #  release = (compile {
+  #    inherit system target gitVersion pkgsSrc cargo2nixOverlay;
+  #    release = true;
+  #  }).workspace.garage { compileMode = "build"; };
+  #});
+
+  #test = (rustPkgs:
+  #  pkgs.symlinkJoin {
+  #    name = "garage-tests";
+  #    paths =
+  #      builtins.map (key: rustPkgs.workspace.${key} { compileMode = "test"; })
+  #      (builtins.attrNames rustPkgs.workspace);
+  #  });
+
+  builtFeatures = if features != null then
+      features
+  else (
+    [ "garage/bundled-libs" "garage/sled" "garage/lmdb" "garage/k2v" ] ++ (
+      if release then [
+        "garage/consul-discovery"
+        "garage/kubernetes-discovery"
+        "garage/metrics"
+        "garage/telemetry-otlp"
         "garage/lmdb"
         "garage/sqlite"
-      ];
-    });
-  };
-  clippy = {
-    amd64 = (compile {
-      inherit system git_version pkgsSrc cargo2nixOverlay;
-      target = "x86_64-unknown-linux-musl";
-      compiler = "clippy";
-    }).workspace.garage { compileMode = "build"; };
+      ] else [ ]
+    )
+  );
+
+in {
+
+  inherit pkgs;
+
+  release = naersk.buildPackage rec {
+    inherit release;
+
+    src = ./.;
+    strictDeps = true;
+    doCheck = false;
+
+    depsBuildBuild = (buildTarget.depsBuildBuild pkgsCross) ++ [
+      pkgs.protobuf
+    ];
+
+    cargoBuildOptions = prev: prev++[
+      "--features=${builtins.concatStringsSep "," builtFeatures}"
+    ];
+
+    OPENSSL_STATIC = "1";
+    OPENSSL_LIB_DIR = "${pkgsCross.pkgsStatic.openssl.out}/lib";
+    OPENSSL_INCLUDE_DIR = "${pkgsCross.pkgsStatic.openssl.dev}/include";
+
+    # Required because ring crate is special. This also seems to have
+    # fixed some issues with the x86_64-windows cross-compile :shrug:
+    TARGET_CC = "${pkgsCross.stdenv.cc}/bin/${pkgsCross.stdenv.cc.targetPrefix}cc";
+
+    CARGO_BUILD_TARGET = rustTarget;
+    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"
+
+      # https://github.com/rust-lang/cargo/issues/4133
+      "-C" "linker=${TARGET_CC}"
+    ];
   };
+
+  # TODO
+  #clippy = {
+  #  amd64 = (compile {
+  #    inherit system gitVersion pkgsSrc cargo2nixOverlay;
+  #    target = "x86_64-unknown-linux-musl";
+  #    compiler = "clippy";
+  #  }).workspace.garage { compileMode = "build"; };
+  #};
 }