Merge pull request #308801 from jmbaur/switch-to-configuration-rs

nixos/switch-to-configuration: add new implementation

nixos/modules/system/activation/switchable-system.nix

@@ -4,52 +4,93 @@ let
 
   perlWrapped = pkgs.perl.withPackages (p: with p; [ ConfigIniFiles FileSlurp ]);
 
+  description = extra: ''
+    Whether to include the capability to switch configurations.
+
+    Disabling this makes the system unable to be reconfigured via `nixos-rebuild`.
+
+    ${extra}
+  '';
+
 in
 
 {
 
-  options = {
+  options.system.switch = {
-    system.switch.enable = lib.mkOption {
+    enable = lib.mkOption {
       type = lib.types.bool;
       default = true;
-      description = ''
+      description = description ''
-        Whether to include the capability to switch configurations.
-
-        Disabling this makes the system unable to be reconfigured via `nixos-rebuild`.
-
         This is good for image based appliances where updates are handled
         outside the image. Reducing features makes the image lighter and
         slightly more secure.
       '';
     };
+
+    enableNg = lib.mkOption {
+      type = lib.types.bool;
+      default = false;
+      description = description ''
+        Whether to use `switch-to-configuration-ng`, an experimental
+        re-implementation of `switch-to-configuration` with the goal of
+        replacing the original.
+      '';
+    };
   };
 
-  config = lib.mkIf config.system.switch.enable {
+  config = lib.mkMerge [
-    system.activatableSystemBuilderCommands = ''
+    {
-      mkdir $out/bin
+      assertions = [{
-      substitute ${./switch-to-configuration.pl} $out/bin/switch-to-configuration \
+        assertion = with config.system.switch; enable -> !enableNg;
-        --subst-var out \
+        message = "Only one of system.switch.enable and system.switch.enableNg may be enabled at a time";
-        --subst-var-by toplevel ''${!toplevelVar} \
+      }];
-        --subst-var-by coreutils "${pkgs.coreutils}" \
+    }
-        --subst-var-by distroId ${lib.escapeShellArg config.system.nixos.distroId} \
+    (lib.mkIf config.system.switch.enable {
-        --subst-var-by installBootLoader ${lib.escapeShellArg config.system.build.installBootLoader} \
+      system.activatableSystemBuilderCommands = ''
-        --subst-var-by localeArchive "${config.i18n.glibcLocales}/lib/locale/locale-archive" \
+        mkdir $out/bin
-        --subst-var-by perl "${perlWrapped}" \
+        substitute ${./switch-to-configuration.pl} $out/bin/switch-to-configuration \
-        --subst-var-by shell "${pkgs.bash}/bin/sh" \
+          --subst-var out \
-        --subst-var-by su "${pkgs.shadow.su}/bin/su" \
+          --subst-var-by toplevel ''${!toplevelVar} \
-        --subst-var-by systemd "${config.systemd.package}" \
+          --subst-var-by coreutils "${pkgs.coreutils}" \
-        --subst-var-by utillinux "${pkgs.util-linux}" \
+          --subst-var-by distroId ${lib.escapeShellArg config.system.nixos.distroId} \
-        ;
+          --subst-var-by installBootLoader ${lib.escapeShellArg config.system.build.installBootLoader} \
+          --subst-var-by localeArchive "${config.i18n.glibcLocales}/lib/locale/locale-archive" \
+          --subst-var-by perl "${perlWrapped}" \
+          --subst-var-by shell "${pkgs.bash}/bin/sh" \
+          --subst-var-by su "${pkgs.shadow.su}/bin/su" \
+          --subst-var-by systemd "${config.systemd.package}" \
+          --subst-var-by utillinux "${pkgs.util-linux}" \
+          ;
 
-      chmod +x $out/bin/switch-to-configuration
+        chmod +x $out/bin/switch-to-configuration
-      ${lib.optionalString (pkgs.stdenv.hostPlatform == pkgs.stdenv.buildPlatform) ''
+        ${lib.optionalString (pkgs.stdenv.hostPlatform == pkgs.stdenv.buildPlatform) ''
-        if ! output=$(${perlWrapped}/bin/perl -c $out/bin/switch-to-configuration 2>&1); then
+          if ! output=$(${perlWrapped}/bin/perl -c $out/bin/switch-to-configuration 2>&1); then
-          echo "switch-to-configuration syntax is not valid:"
+            echo "switch-to-configuration syntax is not valid:"
-          echo "$output"
+            echo "$output"
-          exit 1
+            exit 1
-        fi
+          fi
-      ''}
+        ''}
-    '';
+      '';
-  };
+    })
+    (lib.mkIf config.system.switch.enableNg {
+      # Use a subshell so we can source makeWrapper's setup hook without
+      # affecting the rest of activatableSystemBuilderCommands.
+      system.activatableSystemBuilderCommands = ''
+        (
+          source ${pkgs.buildPackages.makeWrapper}/nix-support/setup-hook
+
+          mkdir $out/bin
+          ln -sf ${lib.getExe pkgs.switch-to-configuration-ng} $out/bin/switch-to-configuration
+          wrapProgram $out/bin/switch-to-configuration \
+            --set OUT $out \
+            --set TOPLEVEL ''${!toplevelVar} \
+            --set DISTRO_ID ${lib.escapeShellArg config.system.nixos.distroId} \
+            --set INSTALL_BOOTLOADER ${lib.escapeShellArg config.system.build.installBootLoader} \
+            --set LOCALE_ARCHIVE ${config.i18n.glibcLocales}/lib/locale/locale-archive \
+            --set SYSTEMD ${config.systemd.package}
+        )
+      '';
+    })
+  ];
 
 }

nixos/tests/all-tests.nix

@@ -873,7 +873,8 @@ in {
   swap-random-encryption = handleTest ./swap-random-encryption.nix {};
   sway = handleTest ./sway.nix {};
   swayfx = handleTest ./swayfx.nix {};
-  switchTest = handleTest ./switch-test.nix {};
+  switchTest = handleTest ./switch-test.nix { ng = false; };
+  switchTestNg = handleTest ./switch-test.nix { ng = true; };
   sympa = handleTest ./sympa.nix {};
   syncthing = handleTest ./syncthing.nix {};
   syncthing-no-settings = handleTest ./syncthing-no-settings.nix {};

nixos/tests/switch-test.nix

@@ -1,6 +1,6 @@
 # Test configuration switching.
 
-import ./make-test-python.nix ({ lib, pkgs, ...} : let
+import ./make-test-python.nix ({ lib, pkgs, ng, ...} : let
 
   # Simple service that can either be socket-activated or that will
   # listen on port 1234 if not socket-activated.
@@ -48,6 +48,11 @@ in {
 
   nodes = {
     machine = { pkgs, lib, ... }: {
+      system.switch = {
+        enable = !ng;
+        enableNg = ng;
+      };
+
       environment.systemPackages = [ pkgs.socat ]; # for the socket activation stuff
       users.mutableUsers = false;
 

pkgs/by-name/sw/switch-to-configuration-ng/.gitignore

@@ -0,0 +1 @@
+/target

pkgs/by-name/sw/switch-to-configuration-ng/Cargo.lock

@@ -0,0 +1,527 @@
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pkgs/by-name/sw/switch-to-configuration-ng/Cargo.toml

@@ -0,0 +1,19 @@
+[package]
+name = "switch-to-configuration"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+anyhow = "1.0.82"
+dbus = "0.9.7"
+glob = "0.3.1"
+log = "0.4.21"
+nix = { version = "0.28.0", features = ["fs", "signal"] }
+regex = "1.10.4"
+rust-ini = "0.21.0"
+syslog = "6.1.1"
+
+[build-dependencies]
+dbus-codegen = "0.11.0"

pkgs/by-name/sw/switch-to-configuration-ng/build.rs

@@ -0,0 +1,30 @@
+use std::io::Write;
+
+fn code_for_dbus_xml(xml: impl AsRef<std::path::Path>) -> String {
+    dbus_codegen::generate(
+        &std::fs::read_to_string(xml).unwrap(),
+        &dbus_codegen::GenOpts {
+            methodtype: None,
+            connectiontype: dbus_codegen::ConnectionType::Blocking,
+            ..Default::default()
+        },
+    )
+    .unwrap()
+}
+
+fn main() {
+    let systemd_dbus_interface_dir = std::env::var("SYSTEMD_DBUS_INTERFACE_DIR").unwrap();
+    let systemd_dbus_interface_dir = std::path::Path::new(systemd_dbus_interface_dir.as_str());
+
+    let out_path = std::path::PathBuf::from(std::env::var("OUT_DIR").unwrap());
+
+    let systemd_manager_code =
+        code_for_dbus_xml(systemd_dbus_interface_dir.join("org.freedesktop.systemd1.Manager.xml"));
+    let mut file = std::fs::File::create(out_path.join("systemd_manager.rs")).unwrap();
+    file.write_all(systemd_manager_code.as_bytes()).unwrap();
+
+    let logind_manager_code =
+        code_for_dbus_xml(systemd_dbus_interface_dir.join("org.freedesktop.login1.Manager.xml"));
+    let mut file = std::fs::File::create(out_path.join("logind_manager.rs")).unwrap();
+    file.write_all(logind_manager_code.as_bytes()).unwrap();
+}

pkgs/by-name/sw/switch-to-configuration-ng/package.nix

@@ -0,0 +1,36 @@
+{
+  buildPackages,
+  dbus,
+  lib,
+  pkg-config,
+  rustPlatform,
+}:
+
+rustPlatform.buildRustPackage {
+  pname = "switch-to-configuration";
+  version = "0.1.0";
+
+  src = lib.fileset.toSource {
+    root = ./.;
+    fileset = lib.fileset.unions [
+      ./Cargo.lock
+      ./Cargo.toml
+      ./build.rs
+      ./src
+    ];
+  };
+
+  cargoLock.lockFile = ./Cargo.lock;
+
+  nativeBuildInputs = [ pkg-config ];
+  buildInputs = [ dbus ];
+
+  env.SYSTEMD_DBUS_INTERFACE_DIR = "${buildPackages.systemd}/share/dbus-1/interfaces";
+
+  meta = {
+    description = "NixOS switch-to-configuration program";
+    mainProgram = "switch-to-configuration";
+    maintainers = with lib.maintainers; [ jmbaur ];
+    license = lib.licenses.mit;
+  };
+}