add systemd_service rust plugin (step 1a, no qml wiring yet)

This commit is contained in:
Damocles 2026-05-07 12:54:44 +02:00
parent d55753ab28
commit 96bfc1fd5a
5 changed files with 822 additions and 0 deletions

544
plugin/Cargo.lock generated
View file

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source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "1c1567a6ec68df868cbbfde844cfc6d81649fe5109a62b116b19fabd53e618ee"
dependencies = [
"endi",
"enumflags2",
"serde",
"winnow",
"zvariant_derive",
"zvariant_utils",
]
[[package]]
name = "zvariant_derive"
version = "5.11.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "c7d5b780599bbde114e39d9a0799577fad1ced5105d38515745f7b3099d8ceda"
dependencies = [
"proc-macro-crate",
"proc-macro2",
"quote",
"syn",
"zvariant_utils",
]
[[package]]
name = "zvariant_utils"
version = "3.3.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "6d464f5733ffa07a3164d656f18533caace9d0638596721355d73256a410d691"
dependencies = [
"proc-macro2",
"quote",
"serde",
"syn",
"winnow",
]

View file

@ -23,6 +23,8 @@ serde_json = "1.0.149"
dirs = "6.0.0"
tracing = "0.1.44"
tracing-subscriber = { version = "0.3.23", features = ["env-filter"] }
zbus = { version = "5.15.0", default-features = false, features = ["tokio"] }
tokio = { version = "1.52.2", features = ["macros", "net", "rt", "sync", "time"] }
[build-dependencies]
cxx-qt-build = "0.8.1"

View file

@ -31,6 +31,7 @@ fn main() {
"src/system_stats.rs",
"src/cpu_service.rs",
"src/modules_service.rs",
"src/systemd_service.rs",
"src/theme_service.rs",
];
if !bridge_files.iter().all(|p| manifest.join(p).exists()) {

View file

@ -2,6 +2,7 @@ pub mod cpu_service;
pub mod modules_service;
pub mod stats;
pub mod system_stats;
pub mod systemd_service;
pub mod theme_service;
#[ctor::ctor(unsafe)]

View file

@ -0,0 +1,274 @@
// In-process systemd state for nova-shell.
//
// Lists of units and machines are exposed to QML as JSON-encoded QString props
// (`failedUnitsJson`, `containersJson`) rather than QList<QVariantMap>. cxx-qt
// 0.8.1 does not implement QVariantValue for QVariantMap/QVariantList, and
// cxx-qt main on git regressed qt-build-utils to require QuickControls2.prl
// files that nixpkgs strips. Switch to QList<QVariantMap> when a release ships
// with both fixes.
use core::pin::Pin;
use cxx_qt_lib::QString;
use serde::Serialize;
use std::sync::OnceLock;
use tokio::runtime::Runtime;
use zbus::{proxy, Connection};
#[cxx_qt::bridge]
pub mod qobject {
unsafe extern "C++" {
include!("cxx-qt-lib/qstring.h");
type QString = cxx_qt_lib::QString;
}
extern "RustQt" {
#[qobject]
#[qml_element]
#[qml_singleton]
#[qproperty(QString, hostname)]
#[qproperty(QString, system_state, cxx_name = "systemState")]
#[qproperty(QString, user_state, cxx_name = "userState")]
#[qproperty(i32, failed_count, cxx_name = "failedCount")]
// JSON array: [{ name, description, subState, scope: "system"|"user", machine: "" | name }]
#[qproperty(QString, failed_units_json, cxx_name = "failedUnitsJson")]
// JSON array: [{ name, class, service, systemState, failedUnits: [...] }]
#[qproperty(QString, containers_json, cxx_name = "containersJson")]
type SystemdService = super::SystemdServiceRust;
#[qinvokable]
fn poll(self: Pin<&mut Self>);
#[qinvokable]
#[cxx_name = "restartUnit"]
fn restart_unit(self: Pin<&mut Self>, name: QString, scope: QString, machine: QString);
}
impl cxx_qt::Initialize for SystemdService {}
}
// systemd1.Manager.ListUnitsFiltered returns a(ssssssouso): name, description,
// load_state, active_state, sub_state, follower, unit_path, job_id, job_type, job_path.
type UnitTuple = (
String,
String,
String,
String,
String,
String,
zbus::zvariant::OwnedObjectPath,
u32,
String,
zbus::zvariant::OwnedObjectPath,
);
#[proxy(
interface = "org.freedesktop.systemd1.Manager",
default_service = "org.freedesktop.systemd1",
default_path = "/org/freedesktop/systemd1"
)]
trait SystemdManager {
#[zbus(property)]
fn system_state(&self) -> zbus::Result<String>;
fn list_units_filtered(&self, states: Vec<&str>) -> zbus::Result<Vec<UnitTuple>>;
fn restart_unit(
&self,
name: &str,
mode: &str,
) -> zbus::Result<zbus::zvariant::OwnedObjectPath>;
}
#[proxy(
interface = "org.freedesktop.machine1.Manager",
default_service = "org.freedesktop.machine1",
default_path = "/org/freedesktop/machine1"
)]
trait Machined {
fn list_machines(
&self,
) -> zbus::Result<Vec<(String, String, String, zbus::zvariant::OwnedObjectPath)>>;
}
#[derive(Serialize)]
struct UnitJson<'a> {
name: &'a str,
description: &'a str,
#[serde(rename = "subState")]
sub_state: &'a str,
scope: &'a str,
machine: &'a str,
}
#[derive(Serialize)]
struct ContainerJson<'a> {
name: &'a str,
class: &'a str,
service: &'a str,
#[serde(rename = "systemState")]
system_state: &'a str,
#[serde(rename = "failedUnits")]
failed_units: Vec<UnitJson<'a>>,
}
pub struct SystemdServiceRust {
hostname: QString,
system_state: QString,
user_state: QString,
failed_count: i32,
failed_units_json: QString,
containers_json: QString,
}
impl Default for SystemdServiceRust {
fn default() -> Self {
Self {
hostname: QString::from(read_hostname()),
system_state: QString::from("unknown"),
user_state: QString::from("unknown"),
failed_count: 0,
failed_units_json: QString::from("[]"),
containers_json: QString::from("[]"),
}
}
}
fn read_hostname() -> String {
std::fs::read_to_string("/etc/hostname")
.map(|s| s.trim().to_string())
.unwrap_or_else(|_| "localhost".to_string())
}
fn rt() -> &'static Runtime {
static RT: OnceLock<Runtime> = OnceLock::new();
RT.get_or_init(|| {
tokio::runtime::Builder::new_current_thread()
.enable_all()
.build()
.expect("tokio runtime")
})
}
async fn fetch_failed(bus: &Connection) -> (String, Vec<UnitTuple>) {
let mut state = String::from("unknown");
let mut units = Vec::new();
if let Ok(mgr) = SystemdManagerProxy::new(bus).await {
if let Ok(s) = mgr.system_state().await {
state = s;
}
if let Ok(u) = mgr.list_units_filtered(vec!["failed"]).await {
units = u;
}
}
(state, units)
}
async fn poll_async() -> (
String,
String,
Vec<UnitTuple>,
Vec<UnitTuple>,
Vec<(String, String, String)>,
) {
let mut sys_state = String::from("unknown");
let mut sys_units = Vec::new();
let mut user_state = String::from("unknown");
let mut user_units = Vec::new();
let mut machines = Vec::new();
if let Ok(c) = Connection::system().await {
let (s, u) = fetch_failed(&c).await;
sys_state = s;
sys_units = u;
if let Ok(m) = MachinedProxy::new(&c).await {
if let Ok(list) = m.list_machines().await {
machines = list
.into_iter()
.filter(|(name, _, _, _)| name != ".host")
.map(|(n, c, s, _)| (n, c, s))
.collect();
}
}
}
if let Ok(c) = Connection::session().await {
let (s, u) = fetch_failed(&c).await;
user_state = s;
user_units = u;
}
(sys_state, user_state, sys_units, user_units, machines)
}
fn unit_jsons<'a>(units: &'a [UnitTuple], scope: &'a str, machine: &'a str) -> Vec<UnitJson<'a>> {
units
.iter()
.map(|u| UnitJson {
name: &u.0,
description: &u.1,
sub_state: &u.4,
scope,
machine,
})
.collect()
}
impl cxx_qt::Initialize for qobject::SystemdService {
fn initialize(self: Pin<&mut Self>) {
self.poll();
}
}
impl qobject::SystemdService {
fn poll(mut self: Pin<&mut Self>) {
let (sys_state, user_state, sys_units, user_units, machines) = rt().block_on(poll_async());
let mut all_failed: Vec<UnitJson> = Vec::with_capacity(sys_units.len() + user_units.len());
all_failed.extend(unit_jsons(&sys_units, "system", ""));
all_failed.extend(unit_jsons(&user_units, "user", ""));
let count = all_failed.len() as i32;
let failed_json = serde_json::to_string(&all_failed).unwrap_or_else(|_| "[]".into());
let containers: Vec<ContainerJson> = machines
.iter()
.map(|(n, c, s)| ContainerJson {
name: n,
class: c,
service: s,
system_state: "unknown",
failed_units: Vec::new(),
})
.collect();
let containers_json = serde_json::to_string(&containers).unwrap_or_else(|_| "[]".into());
self.as_mut().set_system_state(QString::from(sys_state));
self.as_mut().set_user_state(QString::from(user_state));
self.as_mut().set_failed_units_json(QString::from(failed_json));
self.as_mut().set_failed_count(count);
self.as_mut().set_containers_json(QString::from(containers_json));
}
fn restart_unit(self: Pin<&mut Self>, name: QString, scope: QString, machine: QString) {
let name = name.to_string();
let scope = scope.to_string();
let machine = machine.to_string();
let _ = self;
rt().block_on(async move {
// Local-only restart for now. Container/remote restart comes later.
if !machine.is_empty() {
tracing::warn!(target: "nova_plugin", machine = %machine, "container restart not yet implemented");
return;
}
let conn = match scope.as_str() {
"user" => Connection::session().await,
_ => Connection::system().await,
};
let Ok(conn) = conn else { return };
let Ok(mgr) = SystemdManagerProxy::new(&conn).await else {
return;
};
if let Err(e) = mgr.restart_unit(&name, "replace").await {
tracing::warn!(target: "nova_plugin", unit = %name, error = %e, "restart_unit failed");
}
});
}
}