Nix setup

.envrc

@@ -0,0 +1 @@
+eval "$(lorri direnv)"

.gitignore

@@ -1,2 +1,3 @@
 /target
 **/*.rs.bk
+result

Cargo.lock

@@ -1,3 +1,5 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
 [[package]]
 name = "MacTypes-sys"
 version = "2.1.0"

common_deps.nix

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+{ pkgs }:
+with pkgs; [
+  openssl
+  pkgconfig
+  rustc
+  cargo
+]

default.nix

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+let
+  sources = import ./nix/sources.nix;
+  nixpkgs-mozilla = import sources.nixpkgs-mozilla;
+  pkgs = import sources.nixpkgs {
+    overlays = [
+      nixpkgs-mozilla
+      (
+        self: super:
+          {
+            rustc = self.latest.rustChannels.nightly.rust;
+            cargo = self.latest.rustChannels.nightly.rust;
+          }
+      )
+    ];
+  };
+  src = builtins.filterSource
+    (path: type: type != "directory" || builtins.baseNameOf path != "target")
+    ./.;
+  deps = import ./common_deps.nix { inherit pkgs; };
+  naersk = pkgs.callPackage sources.naersk {};
+in
+naersk.buildPackage {
+  inherit src;
+  buildInputs = deps;
+  remapPathPrefix = true;
+}

nix/sources.json

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+{
+    "naersk": {
+        "branch": "master",
+        "description": "Build rust crates in Nix. No configuration, no code generation, no IFD. Sandbox friendly.",
+        "homepage": "",
+        "owner": "nmattia",
+        "repo": "naersk",
+        "rev": "a82fd7dc31a58c462b6dfa9d9d886fa2cc75dfd4",
+        "sha256": "00bjwir52y6jbf0b22qy9qxramw35k5fc7kp9hymr1zgpmw9kbwg",
+        "type": "tarball",
+        "url": "https://github.com/nmattia/naersk/archive/a82fd7dc31a58c462b6dfa9d9d886fa2cc75dfd4.tar.gz",
+        "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
+    },
+    "niv": {
+        "branch": "master",
+        "description": "Easy dependency management for Nix projects",
+        "homepage": "https://github.com/nmattia/niv",
+        "owner": "nmattia",
+        "repo": "niv",
+        "rev": "f73bf8d584148677b01859677a63191c31911eae",
+        "sha256": "0jlmrx633jvqrqlyhlzpvdrnim128gc81q5psz2lpp2af8p8q9qs",
+        "type": "tarball",
+        "url": "https://github.com/nmattia/niv/archive/f73bf8d584148677b01859677a63191c31911eae.tar.gz",
+        "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
+    },
+    "nixpkgs": {
+        "branch": "nixos-19.09",
+        "description": "A read-only mirror of NixOS/nixpkgs tracking the released channels. Send issues and PRs to",
+        "homepage": "https://github.com/NixOS/nixpkgs",
+        "owner": "NixOS",
+        "repo": "nixpkgs-channels",
+        "rev": "d858110e35b652a02e11deabe7fba2fc28f10945",
+        "sha256": "1b7sdy9nhk97s9wbn40yij67hmln3d8030mlkx9rwi0wgg90irc1",
+        "type": "tarball",
+        "url": "https://github.com/NixOS/nixpkgs-channels/archive/d858110e35b652a02e11deabe7fba2fc28f10945.tar.gz",
+        "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
+    },
+    "nixpkgs-mozilla": {
+        "branch": "master",
+        "description": "mozilla related nixpkgs (extends nixos/nixpkgs repo)",
+        "homepage": null,
+        "owner": "mozilla",
+        "repo": "nixpkgs-mozilla",
+        "rev": "e912ed483e980dfb4666ae0ed17845c4220e5e7c",
+        "sha256": "08fvzb8w80bkkabc1iyhzd15f4sm7ra10jn32kfch5klgl0gj3j3",
+        "type": "tarball",
+        "url": "https://github.com/mozilla/nixpkgs-mozilla/archive/e912ed483e980dfb4666ae0ed17845c4220e5e7c.tar.gz",
+        "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
+    }
+}

nix/sources.nix

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+# This file has been generated by Niv.
+
+let
+
+  #
+  # The fetchers. fetch_<type> fetches specs of type <type>.
+  #
+
+  fetch_file = pkgs: spec:
+    if spec.builtin or true then
+      builtins_fetchurl { inherit (spec) url sha256; }
+    else
+      pkgs.fetchurl { inherit (spec) url sha256; };
+
+  fetch_tarball = pkgs: spec:
+    if spec.builtin or true then
+      builtins_fetchTarball { inherit (spec) url sha256; }
+    else
+      pkgs.fetchzip { inherit (spec) url sha256; };
+
+  fetch_git = spec:
+    builtins.fetchGit { url = spec.repo; inherit (spec) rev ref; };
+
+  fetch_builtin-tarball = spec:
+    builtins.trace
+      ''
+        WARNING:
+          The niv type "builtin-tarball" will soon be deprecated. You should
+          instead use `builtin = true`.
+
+          $ niv modify <package> -a type=tarball -a builtin=true
+      ''
+      builtins_fetchTarball { inherit (spec) url sha256; };
+
+  fetch_builtin-url = spec:
+    builtins.trace
+      ''
+        WARNING:
+          The niv type "builtin-url" will soon be deprecated. You should
+          instead use `builtin = true`.
+
+          $ niv modify <package> -a type=file -a builtin=true
+      ''
+      (builtins_fetchurl { inherit (spec) url sha256; });
+
+  #
+  # Various helpers
+  #
+
+  # The set of packages used when specs are fetched using non-builtins.
+  mkPkgs = sources:
+    let
+      sourcesNixpkgs =
+        import (builtins_fetchTarball { inherit (sources.nixpkgs) url sha256; }) {};
+      hasNixpkgsPath = builtins.any (x: x.prefix == "nixpkgs") builtins.nixPath;
+      hasThisAsNixpkgsPath = <nixpkgs> == ./.;
+    in
+      if builtins.hasAttr "nixpkgs" sources
+      then sourcesNixpkgs
+      else if hasNixpkgsPath && ! hasThisAsNixpkgsPath then
+        import <nixpkgs> {}
+      else
+        abort
+          ''
+            Please specify either <nixpkgs> (through -I or NIX_PATH=nixpkgs=...) or
+            add a package called "nixpkgs" to your sources.json.
+          '';
+
+  # The actual fetching function.
+  fetch = pkgs: name: spec:
+
+    if ! builtins.hasAttr "type" spec then
+      abort "ERROR: niv spec ${name} does not have a 'type' attribute"
+    else if spec.type == "file" then fetch_file pkgs spec
+    else if spec.type == "tarball" then fetch_tarball pkgs spec
+    else if spec.type == "git" then fetch_git spec
+    else if spec.type == "builtin-tarball" then fetch_builtin-tarball spec
+    else if spec.type == "builtin-url" then fetch_builtin-url spec
+    else
+      abort "ERROR: niv spec ${name} has unknown type ${builtins.toJSON spec.type}";
+
+  # Ports of functions for older nix versions
+
+  # a Nix version of mapAttrs if the built-in doesn't exist
+  mapAttrs = builtins.mapAttrs or (
+    f: set: with builtins;
+    listToAttrs (map (attr: { name = attr; value = f attr set.${attr}; }) (attrNames set))
+  );
+
+  # fetchTarball version that is compatible between all the versions of Nix
+  builtins_fetchTarball = { url, sha256 }@attrs:
+    let
+      inherit (builtins) lessThan nixVersion fetchTarball;
+    in
+      if lessThan nixVersion "1.12" then
+        fetchTarball { inherit url; }
+      else
+        fetchTarball attrs;
+
+  # fetchurl version that is compatible between all the versions of Nix
+  builtins_fetchurl = { url, sha256 }@attrs:
+    let
+      inherit (builtins) lessThan nixVersion fetchurl;
+    in
+      if lessThan nixVersion "1.12" then
+        fetchurl { inherit url; }
+      else
+        fetchurl attrs;
+
+  # Create the final "sources" from the config
+  mkSources = config:
+    mapAttrs (
+      name: spec:
+        if builtins.hasAttr "outPath" spec
+        then abort
+          "The values in sources.json should not have an 'outPath' attribute"
+        else
+          spec // { outPath = fetch config.pkgs name spec; }
+    ) config.sources;
+
+  # The "config" used by the fetchers
+  mkConfig =
+    { sourcesFile ? ./sources.json
+    , sources ? builtins.fromJSON (builtins.readFile sourcesFile)
+    , pkgs ? mkPkgs sources
+    }: rec {
+      # The sources, i.e. the attribute set of spec name to spec
+      inherit sources;
+
+      # The "pkgs" (evaluated nixpkgs) to use for e.g. non-builtin fetchers
+      inherit pkgs;
+    };
+in
+mkSources (mkConfig {}) // { __functor = _: settings: mkSources (mkConfig settings); }

shell.nix

@@ -0,0 +1,21 @@
+let
+  sources = import ./nix/sources.nix;
+  nixpkgs-mozilla = import sources.nixpkgs-mozilla;
+  pkgs = import sources.nixpkgs {
+    overlays = [
+      nixpkgs-mozilla
+      (
+        self: super:
+          {
+            rustc = self.latest.rustChannels.nightly.rust;
+            cargo = self.latest.rustChannels.nightly.rust;
+          }
+      )
+    ];
+  };
+  naersk = pkgs.callPackage sources.naersk {};
+  deps = import ./common_deps.nix { inherit pkgs; };
+in
+pkgs.mkShell {
+  buildInputs = deps;
+}