chore: add Nix dev shell (#218)

Author: hawkw

.envrc

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+use nix;

default.nix

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+scope@{ pkgs ? import <nixpkgs> { } }:
+
+let locale = "en_US.UTF8";
+in with pkgs;
+buildEnv {
+  name = "mnemos-env";
+  paths = with pkgs;
+    [
+      git
+      bash
+      direnv
+      binutils
+      stdenv
+      bashInteractive
+      docker
+      cacert
+      gcc
+      openssl
+      shellcheck
+      (glibcLocales.override { locales = [ locale ]; })
+    ] ++ lib.optional stdenv.isDarwin [ Security libiconv ];
+
+  nativeBuildInputs = [ pkg-config cmake rustup ];
+  buildInputs = [
+    clang
+    libclang
+    systemd
+    udev
+    SDL2
+    SDL2.dev
+    # other stuff
+    bash
+  ];
+  passthru = with pkgs; {
+    SSL_CERT_FILE = "${cacert}/etc/ssl/certs/ca-bundle.crt";
+    GIT_SSL_CAINFO = "${cacert}/etc/ssl/certs/ca-bundle.crt";
+    CURL_CA_BUNDLE = "${cacert}/etc/ca-bundle.crt";
+
+    CARGO_TERM_COLOR = "always";
+    RUST_BACKTRACE = "true";
+
+    LIBCLANG_PATH = "${llvmPackages.libclang.lib}/lib";
+
+    OPENSSL_DIR = "${openssl.dev}";
+    OPENSSL_LIB_DIR = "${openssl.out}/lib";
+
+    LD_LIBRARY_PATH = "${lib.makeLibraryPath buildInputs}";
+
+  };
+}

shell.nix

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+scope@{ pkgs ? import <nixpkgs> { } }:
+with pkgs;
+let
+  mnemos = import ./default.nix { inherit pkgs; };
+
+  env = buildEnv {
+    name = "mnemos-env";
+    paths = [ ] ++ lib.optional stdenv.isDarwin libiconv ++ mnemos.buildInputs
+      ++ mnemos.nativeBuildInputs;
+  };
+in mkShell {
+  nativeBuildInputs = [ pkg-config ];
+  buildInputs = [
+    clang
+    libclang
+    systemd
+    udev
+    # for melpomene
+    SDL2
+    SDL2.dev
+  ];
+  packages = [
+    # devtools
+    just
+    cargo-nextest
+    direnv
+    # rust esp32 tools
+    cargo-espflash
+    cargo-espmonitor
+    # for testing the x86_64 kernel
+    qemu
+  ];
+
+  PROTOC = "${protobuf}/bin/protoc";
+  PROTOC_INCLUDE = "${protobuf}/include";
+
+  SSL_CERT_FILE = "${cacert}/etc/ssl/certs/ca-bundle.crt";
+  GIT_SSL_CAINFO = "${cacert}/etc/ssl/certs/ca-bundle.crt";
+  CURL_CA_BUNDLE = "${cacert}/etc/ca-bundle.crt";
+  CARGO_TERM_COLOR = "always";
+
+  LIBCLANG_PATH = "${llvmPackages.libclang.lib}/lib";
+
+  OPENSSL_DIR = "${openssl.dev}";
+  OPENSSL_LIB_DIR = "${openssl.out}/lib";
+}