feat(hostd): varlink interfaced host controller to manage machine configuration and boot mgmt

hostd/src/machine.rs

@@ -0,0 +1,45 @@
+use dropshot::{endpoint, HttpError, HttpResponseOk, RequestContext};
+use schemars::JsonSchema;
+use serde::Serialize;
+use std::sync::Arc;
+use trace_request::trace_request;
+
+use crate::context::ControllerContext;
+
+/// Machine information
+#[derive(Serialize, JsonSchema)]
+#[serde(rename_all = "camelCase")]
+struct MachineInfo {
+    machine_id: String,
+}
+
+/// Fetch machine info
+#[endpoint {
+    method = GET,
+    path = "/machine_info",
+}]
+#[trace_request]
+pub async fn describe(
+    rqctx: RequestContext<Arc<ControllerContext>>,
+) -> Result<HttpResponseOk<MachineInfo>, HttpError> {
+    let conn = zbus::Connection::system().await.unwrap();
+    let manager = zbus_systemd::hostname1::HostnamedProxy::new(&conn)
+        .await
+        .unwrap();
+
+    let machine_id = manager
+        .machine_id()
+        .await
+        .unwrap()
+        // convert bytes to hex string
+        .iter()
+        .map(|&b| format!("{:02x}", b))
+        .collect::<String>();
+
+    let machine_info = MachineInfo { machine_id };
+
+    tracing::info_span!("Hello, span hostd!");
+
+    tracing::info!(monotonic_counter.version_calls = 1);
+    Ok(HttpResponseOk(machine_info))
+}