nixos/switch-to-configuration: add new implementation

This adds an implementation of switch-to-configuration that allows for
closer interaction with the lifecycle of systemd units by using DBus
APIs directly instead of using systemctl. It is disabled by default, but
can be enabled by specifying `{ system.switch = { enable = false; enableNg = true; }; }`.
This commit is contained in:
Jared Baur 2024-05-03 06:27:42 -07:00
parent e21dccc5a1
commit 32bf051ba4
No known key found for this signature in database
9 changed files with 2772 additions and 35 deletions

View File

@ -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 = {
system.switch.enable = lib.mkOption {
options.system.switch = {
enable = lib.mkOption {
type = lib.types.bool;
default = true;
description = ''
Whether to include the capability to switch configurations.
Disabling this makes the system unable to be reconfigured via `nixos-rebuild`.
description = description ''
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 {
system.activatableSystemBuilderCommands = ''
mkdir $out/bin
substitute ${./switch-to-configuration.pl} $out/bin/switch-to-configuration \
--subst-var out \
--subst-var-by toplevel ''${!toplevelVar} \
--subst-var-by coreutils "${pkgs.coreutils}" \
--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}" \
;
config = lib.mkMerge [
{
assertions = [{
assertion = with config.system.switch; enable -> !enableNg;
message = "Only one of system.switch.enable and system.switch.enableNg may be enabled at a time";
}];
}
(lib.mkIf config.system.switch.enable {
system.activatableSystemBuilderCommands = ''
mkdir $out/bin
substitute ${./switch-to-configuration.pl} $out/bin/switch-to-configuration \
--subst-var out \
--subst-var-by toplevel ''${!toplevelVar} \
--subst-var-by coreutils "${pkgs.coreutils}" \
--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
${lib.optionalString (pkgs.stdenv.hostPlatform == pkgs.stdenv.buildPlatform) ''
if ! output=$(${perlWrapped}/bin/perl -c $out/bin/switch-to-configuration 2>&1); then
echo "switch-to-configuration syntax is not valid:"
echo "$output"
exit 1
fi
''}
'';
};
chmod +x $out/bin/switch-to-configuration
${lib.optionalString (pkgs.stdenv.hostPlatform == pkgs.stdenv.buildPlatform) ''
if ! output=$(${perlWrapped}/bin/perl -c $out/bin/switch-to-configuration 2>&1); then
echo "switch-to-configuration syntax is not valid:"
echo "$output"
exit 1
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}
)
'';
})
];
}

View File

@ -871,7 +871,8 @@ 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 {};

View File

@ -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;

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@ -0,0 +1 @@
/target

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@ -0,0 +1,527 @@
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source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "49874b5167b65d7193b8aba1567f5c7d93d001cafc34600cee003eda787e483f"
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name = "wasi"
version = "0.11.0+wasi-snapshot-preview1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "9c8d87e72b64a3b4db28d11ce29237c246188f4f51057d65a7eab63b7987e423"
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name = "winapi"
version = "0.3.9"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
dependencies = [
"winapi-i686-pc-windows-gnu",
"winapi-x86_64-pc-windows-gnu",
]
[[package]]
name = "winapi-i686-pc-windows-gnu"
version = "0.4.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
[[package]]
name = "winapi-x86_64-pc-windows-gnu"
version = "0.4.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
[[package]]
name = "xml-rs"
version = "0.8.20"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "791978798f0597cfc70478424c2b4fdc2b7a8024aaff78497ef00f24ef674193"

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@ -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"

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@ -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();
}

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@ -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;
};
}

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