@@ -0,0 +1,84 @@
+{
+  lib,
+  stdenv,
+  fetchFromGitHub,
+  rustPlatform,
+  pkg-config,
+  openssl,
+  darwin,
+  libiconv,
+  installShellFiles,
+  nix-update-script,
+}:
+
+rustPlatform.buildRustPackage rec {
+  pname = "nix-weather";
+  version = "0.0.3";
+
+  # fetch from GitHub and not upstream forgejo because cafkafk doesn't want to
+  # pay for bandwidth
+  src = fetchFromGitHub {
+    owner = "cafkafk";
+    repo = "nix-weather";
+    rev = "v${version}";
+    hash = "sha256-deVgDYYIv5SyKrkPAfPgbmQ/n4hYSrK2dohaiR5O0QE=";
+  };
+
+  cargoHash = "sha256-QJybGxqOJid1D6FTy7lvrakkB/Ss3P3JnXtU1UlGlW0=";
+  cargoExtraArgs = "-p nix-weather";
+
+  nativeBuildInputs = [ pkg-config ];
+  buildInputs =
+    [
+      openssl
+      installShellFiles
+    ]
+    ++ lib.optionals stdenv.isDarwin [
+      libiconv
+      darwin.apple_sdk.frameworks.Security
+      darwin.apple_sdk.frameworks.SystemConfiguration
+    ];
+
+  outputs = [
+    "out"
+    "man"
+  ];
+
+  # This is where `build.rs` puts manpages
+  MAN_OUT = "./man";
+
+  postInstall = ''
+    cd crates/nix-weather
+    installManPage man/nix-weather.1
+    installShellCompletion \
+      --fish man/nix-weather.fish \
+      --bash man/nix-weather.bash \
+      --zsh  man/_nix-weather
+    mkdir -p $out
+    cd ../..
+  '';
+
+  # We are the only distro that will ever package this, thus ryanbot will not
+  # be able to find updates through repology and we need this.
+  passthru.updateScript = nix-update-script { };
+
+  meta = with lib; {
+    description = "Check Cache Availablility of NixOS Configurations";
+    longDescription = ''
+      Fast rust tool to check availability of your entire system in caches. It
+      so to speak "checks the weather" before going to update. Useful for
+      debugging cache utilization and timing updates and deployments.
+
+      Heavily inspired by guix weather.
+    '';
+    homepage = "https://git.fem.gg/cafkafk/nix-weather";
+    changelog = "https://git.fem.gg/cafkafk/nix-weather/releases/tag/v${version}";
+    license = licenses.eupl12;
+    mainProgram = "nix-weather";
+    maintainers = with maintainers; [
+      cafkafk
+      freyacodes
+    ];
+    platforms = platforms.all;
+  };
+}