feat(nix): remove devenv, build backend with nix

backend/Cargo.toml

@@ -5,6 +5,8 @@ edition = "2024"
 publish = false
 authors = ["Lucien Cartier-Tilet <lucien@phundrak.com>"]
 license = "AGPL-3.0-only"
+description = "Backend for STA, communicating with the physical relay"
+homepage = "https://labs.phundrak.com/phundrak/sta"
 
 [lib]
 path = "src/lib.rs"

flake.lock

@@ -23,76 +23,6 @@
         "type": "github"
       }
     },
-    "cachix": {
-      "inputs": {
-        "devenv": [
-          "devenv"
-        ],
-        "flake-compat": [
-          "devenv",
-          "flake-compat"
-        ],
-        "git-hooks": [
-          "devenv",
-          "git-hooks"
-        ],
-        "nixpkgs": [
-          "devenv",
-          "nixpkgs"
-        ]
-      },
-      "locked": {
-        "lastModified": 1760971495,
-        "narHash": "sha256-IwnNtbNVrlZIHh7h4Wz6VP0Furxg9Hh0ycighvL5cZc=",
-        "owner": "cachix",
-        "repo": "cachix",
-        "rev": "c5bfd933d1033672f51a863c47303fc0e093c2d2",
-        "type": "github"
-      },
-      "original": {
-        "owner": "cachix",
-        "ref": "latest",
-        "repo": "cachix",
-        "type": "github"
-      }
-    },
-    "devenv": {
-      "inputs": {
-        "cachix": "cachix",
-        "flake-compat": "flake-compat",
-        "flake-parts": "flake-parts",
-        "git-hooks": "git-hooks",
-        "nix": "nix",
-        "nixpkgs": [
-          "nixpkgs"
-        ]
-      },
-      "locked": {
-        "lastModified": 1766843567,
-        "narHash": "sha256-062oL6KZCH7ePf4BBG61OdFJUh5ovw6zTpd/lVwy/xk=",
-        "owner": "cachix",
-        "repo": "devenv",
-        "rev": "d0f2c8545f09e5aba9d321079a284b550371879d",
-        "type": "github"
-      },
-      "original": {
-        "owner": "cachix",
-        "repo": "devenv",
-        "type": "github"
-      }
-    },
-    "devenv-root": {
-      "flake": false,
-      "locked": {
-        "narHash": "sha256-d6xi4mKdjkX2JFicDIv5niSzpyI0m/Hnm8GGAIU04kY=",
-        "type": "file",
-        "url": "file:///dev/null"
-      },
-      "original": {
-        "type": "file",
-        "url": "file:///dev/null"
-      }
-    },
     "fenix": {
       "inputs": {
         "nixpkgs": [
@@ -115,43 +45,6 @@
         "type": "github"
       }
     },
-    "flake-compat": {
-      "flake": false,
-      "locked": {
-        "lastModified": 1761588595,
-        "narHash": "sha256-XKUZz9zewJNUj46b4AJdiRZJAvSZ0Dqj2BNfXvFlJC4=",
-        "owner": "edolstra",
-        "repo": "flake-compat",
-        "rev": "f387cd2afec9419c8ee37694406ca490c3f34ee5",
-        "type": "github"
-      },
-      "original": {
-        "owner": "edolstra",
-        "repo": "flake-compat",
-        "type": "github"
-      }
-    },
-    "flake-parts": {
-      "inputs": {
-        "nixpkgs-lib": [
-          "devenv",
-          "nixpkgs"
-        ]
-      },
-      "locked": {
-        "lastModified": 1760948891,
-        "narHash": "sha256-TmWcdiUUaWk8J4lpjzu4gCGxWY6/Ok7mOK4fIFfBuU4=",
-        "owner": "hercules-ci",
-        "repo": "flake-parts",
-        "rev": "864599284fc7c0ba6357ed89ed5e2cd5040f0c04",
-        "type": "github"
-      },
-      "original": {
-        "owner": "hercules-ci",
-        "repo": "flake-parts",
-        "type": "github"
-      }
-    },
     "flake-utils": {
       "inputs": {
         "systems": "systems"
@@ -186,115 +79,25 @@
         "type": "github"
       }
     },
-    "git-hooks": {
-      "inputs": {
-        "flake-compat": [
-          "devenv",
-          "flake-compat"
-        ],
-        "gitignore": "gitignore",
-        "nixpkgs": [
-          "devenv",
-          "nixpkgs"
-        ]
-      },
-      "locked": {
-        "lastModified": 1760663237,
-        "narHash": "sha256-BflA6U4AM1bzuRMR8QqzPXqh8sWVCNDzOdsxXEguJIc=",
-        "owner": "cachix",
-        "repo": "git-hooks.nix",
-        "rev": "ca5b894d3e3e151ffc1db040b6ce4dcc75d31c37",
-        "type": "github"
-      },
-      "original": {
-        "owner": "cachix",
-        "repo": "git-hooks.nix",
-        "type": "github"
-      }
-    },
-    "gitignore": {
-      "inputs": {
-        "nixpkgs": [
-          "devenv",
-          "git-hooks",
-          "nixpkgs"
-        ]
-      },
-      "locked": {
-        "lastModified": 1709087332,
-        "narHash": "sha256-HG2cCnktfHsKV0s4XW83gU3F57gaTljL9KNSuG6bnQs=",
-        "owner": "hercules-ci",
-        "repo": "gitignore.nix",
-        "rev": "637db329424fd7e46cf4185293b9cc8c88c95394",
-        "type": "github"
-      },
-      "original": {
-        "owner": "hercules-ci",
-        "repo": "gitignore.nix",
-        "type": "github"
-      }
-    },
-    "nix": {
-      "inputs": {
-        "flake-compat": [
-          "devenv",
-          "flake-compat"
-        ],
-        "flake-parts": [
-          "devenv",
-          "flake-parts"
-        ],
-        "git-hooks-nix": [
-          "devenv",
-          "git-hooks"
-        ],
-        "nixpkgs": [
-          "devenv",
-          "nixpkgs"
-        ],
-        "nixpkgs-23-11": [
-          "devenv"
-        ],
-        "nixpkgs-regression": [
-          "devenv"
-        ]
-      },
-      "locked": {
-        "lastModified": 1761648602,
-        "narHash": "sha256-H97KSB/luq/aGobKRuHahOvT1r7C03BgB6D5HBZsbN8=",
-        "owner": "cachix",
-        "repo": "nix",
-        "rev": "3e5644da6830ef65f0a2f7ec22830c46285bfff6",
-        "type": "github"
-      },
-      "original": {
-        "owner": "cachix",
-        "ref": "devenv-2.30.6",
-        "repo": "nix",
-        "type": "github"
-      }
-    },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1764580874,
+        "lastModified": 1777954456,
-        "narHash": "sha256-GMlWyeVh6fVuPeJI+ZmbJVV8DDS5wfdfDY88FHt5g/8=",
+        "narHash": "sha256-hGdgeU2Nk87RAuZyYjyDjFL6LK7dAZN5RE9+hrDTkDU=",
-        "owner": "cachix",
+        "owner": "nixos",
-        "repo": "devenv-nixpkgs",
+        "repo": "nixpkgs",
-        "rev": "dcf61356c3ab25f1362b4a4428a6d871e84f1d1d",
+        "rev": "549bd84d6279f9852cae6225e372cc67fb91a4c1",
         "type": "github"
       },
       "original": {
-        "owner": "cachix",
+        "owner": "nixos",
-        "ref": "rolling",
+        "ref": "nixos-unstable",
-        "repo": "devenv-nixpkgs",
+        "repo": "nixpkgs",
         "type": "github"
       }
     },
     "root": {
       "inputs": {
         "alejandra": "alejandra",
-        "devenv": "devenv",
-        "devenv-root": "devenv-root",
         "flake-utils": "flake-utils",
         "nixpkgs": "nixpkgs",
         "rust-overlay": "rust-overlay"
@@ -324,11 +127,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1766803264,
+        "lastModified": 1777950921,
-        "narHash": "sha256-eGK6He8BR6L7N73kyyjz/vGxZX1Usnr8Gwfs3D18KgE=",
+        "narHash": "sha256-NpOgt8ISaHTDNJZjNUfwFfbieKfRXzab4WKM31gZCGA=",
         "owner": "oxalica",
         "repo": "rust-overlay",
-        "rev": "6b5c52313aaf3f3e1a0a6757bb89846edfb5195c",
+        "rev": "366ea19e0e55b768f74b7a0b2a20f847e7ae828d",
         "type": "github"
       },
       "original": {

flake.nix

@@ -1,57 +1,69 @@
 {
   inputs = {
-    nixpkgs.url = "github:cachix/devenv-nixpkgs/rolling";
+    nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-unstable";
     flake-utils.url = "github:numtide/flake-utils";
     alejandra = {
       url = "github:kamadorueda/alejandra/4.0.0";
       inputs.nixpkgs.follows = "nixpkgs";
     };
-    devenv = {
-      url = "github:cachix/devenv";
-      inputs.nixpkgs.follows = "nixpkgs";
-    };
     rust-overlay = {
       url = "github:oxalica/rust-overlay";
       inputs.nixpkgs.follows = "nixpkgs";
     };
-    devenv-root = {
-      url = "file+file:///dev/null";
-      flake = false;
-    };
   };
 
   nixConfig = {
     extra-trusted-public-keys = [
-      "devenv.cachix.org-1:w1cLUi8dv3hnoSPGAuibQv+f9TZLr6cv/Hm9XgU50cw="
+      "nix-community.cachix.org-1:mB9FSh9qf2dCimDSUo8Zy7bkq5CX+/rkCWyvRCYg3Fs="
+      "phundrak.cachix.org-1:osJAkYO0ioTOPqaQCIXMfIRz1/+YYlVFkup3R2KSexk="
+      "cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY="
     ];
     extra-substituters = [
-      "https://devenv.cachix.org"
+      "https://phundrak.cachix.org?priority=10"
+      "https://nix-community.cachix.org?priority=20"
+      "https://cache.nixos.org?priority=30"
     ];
   };
 
   outputs = {
-    self,
     nixpkgs,
     flake-utils,
     rust-overlay,
     alejandra,
     ...
-  } @ inputs:
+  }:
     flake-utils.lib.eachDefaultSystem (
       system: let
         overlays = [(import rust-overlay)];
         pkgs = import nixpkgs {inherit system overlays;};
         rustVersion = pkgs.rust-bin.stable.latest.default;
-        rustPlatform = pkgs.makeRustPlatform {
+        targets = {
-          cargo = rustVersion;
+          linux-x86_64 = {
-          rustc = rustVersion;
+            crossPkgs = pkgs;
+            triple = "x86_64-unknown-linux-gnu";
+          };
+          linux-aarch64 = {
+            crossPkgs = pkgs.pkgsCross.aarch64-multiplatform;
+            triple = "aarch64-unknown-linux-gnu";
+          };
+        };
+        mkRustBuild = import ./nix/backend.nix;
+        packages = {
+          linux-x86_64 = mkRustBuild targets.linux-x86_64;
+          linux-aarch64 = mkRustBuild targets.linux-aarch64;
+        };
+        defaultBySystem = {
+          "x86_64-linux" = packages.linux-x86_64;
+          "aarch64-linux" = packages.linux-aarch64;
         };
       in {
         formatter = alejandra.defaultPackage.${system};
-        packages = import ./nix/package.nix {inherit pkgs rustPlatform;};
+        packages.backend =
-        devShell = import ./nix/shell.nix {
+          packages
-          inherit inputs pkgs self rustVersion system;
+          // {
-        };
+            default = defaultBySystem.${system} or packages.linux-x86_64;
+          };
+        devShell = import ./nix/shell.nix {inherit pkgs rustVersion;};
       }
     );
 }

nix/backend.nix

@@ -0,0 +1,24 @@
+target: let
+  cargoToml = fromTOML (builtins.readFile ../backend/Cargo.toml);
+  inherit (cargoToml.package) name version;
+  pkgs = target.crossPkgs;
+  buildArgs = {
+    pname = name;
+    inherit version;
+    src = pkgs.lib.cleanSource ../.;
+    cargoLock.lockFile = ../Cargo.lock;
+    useNextest = true;
+    meta = {
+      inherit (cargoToml.package) description homepage;
+    };
+    postBuild = "${pkgs.upx}/bin/upx target/*/release/*${name}";
+  };
+  rustVersion = pkgs.rust-bin.stable.latest.default.override {
+    targets = [target.triple];
+  };
+  rustPlatform = target.crossPkgs.makeRustPlatform {
+    cargo = rustVersion;
+    rustc = rustVersion;
+  };
+in
+  rustPlatform.buildRustPackage buildArgs

nix/package.nix

@@ -1,21 +0,0 @@
-{
-  pkgs,
-  rustPlatform,
-  ...
-}: let
-  cargoToml = builtins.fromTOML (builtins.readFile ../Cargo.toml);
-  name = cargoToml.package.name;
-  version = cargoToml.package.version;
-  rustBuild = rustPlatform.buildRustPackage {
-    pname = name;
-    inherit version;
-    src = ../.;
-    cargoLock.lockFile = ../Cargo.lock;
-  };
-  settingsDir = pkgs.runCommand "settings" {} ''
-    mkdir -p $out/settings
-    cp ${../settings}/*.yaml $out/settings/
-  '';
-in {
-  jj-mcp = rustBuild;
-}

nix/rust-version.nix

@@ -1,11 +0,0 @@
-{
-  rust-overlay,
-  inputs,
-  system,
-  ...
-}: let
-  overlays = [(import rust-overlay)];
-in rec {
-  pkgs = import inputs.nixpkgs {inherit system overlays;};
-  version = pkgs.rust-bin.stable.latest.default;
-}

nix/shell.nix

@@ -1,58 +1,32 @@
 {
-  inputs,
   pkgs,
-  self,
   rustVersion,
-  system,
-  ...
 }:
-inputs.devenv.lib.mkShell {
+pkgs.mkShell {
-  inherit inputs pkgs;
+  packages = with pkgs; [
-  modules = [
+    (rustVersion.override {
-    {
+      extensions = [
-      packages = with pkgs; [
+        "clippy"
-        # Backend
+        "rust-src"
-        (rustVersion.override {
+        "rust-analyzer"
-          extensions = [
+        "rustfmt"
-            "clippy"
-            "rust-src"
-            "rust-analyzer"
-            "rustfmt"
-          ];
-        })
-        bacon
-        cargo-deny
-        cargo-edit
-        cargo-shuttle
-        cargo-tarpaulin
-        just
-        marksman # Markdown LSP server
-        sqlx-cli
-        tombi # TOML LSP server
-
-        # Frontend
-        nodejs_24
-        rustywind # tailwind
-        nodePackages.prettier
-        nodePackages.eslint
-        nodePackages.pnpm
       ];
+    })
+    bacon
+    cargo-deny
+    cargo-edit
+    cargo-shuttle
+    cargo-tarpaulin
+    just
+    marksman # Markdown LSP server
+    sqlx-cli
+    tombi # TOML LSP server
 
-      processes.backend-run.exec = "bacon run";
+    # Frontend
-
+    nodejs_24
-      enterShell = ''
+    rustywind # tailwind
-        echo "🦀 Rust MCP development environment loaded!"
+    prettier
-        echo "📦 Rust version: $(rustc --version)"
+    eslint
-        echo "📦 Cargo version: $(cargo --version)"
+    pnpm
-        echo ""
-        echo "Available tools:"
-        echo "  - rust-analyzer (LSP)"
-        echo "  - clippy (linter)"
-        echo "  - rustfmt (formatter)"
-        echo "  - bacon (continuous testing/linting)"
-        echo "  - cargo-deny (dependency checker)"
-        echo "  - cargo-tarpaulin (code coverage)"
-      '';
-    }
   ];
 }