container: implement exit code xenbus notification

container/Cargo.toml

@@ -25,8 +25,8 @@ features = ["process"]
 [dependencies.krata]
 path = "../shared"
 
-[dependencies.xenevtchn]
-path = "../libs/xen/xenevtchn"
+[dependencies.xenstore]
+path = "../libs/xen/xenstore"
 
 [lib]
 path = "src/lib.rs"

container/src/background.rs

@@ -4,6 +4,7 @@ use crate::childwait::{ChildEvent, ChildWait};
 use anyhow::Result;
 use nix::{libc::c_int, unistd::Pid};
 use tokio::{select, time::sleep};
+use xenstore::client::{XsdClient, XsdInterface};
 
 pub struct ContainerBackground {
     child: Pid,
@@ -40,8 +41,11 @@ impl ContainerBackground {
     }
 
     async fn death(&mut self, code: c_int) -> Result<()> {
-        println!("[krata] container process exited: status = {}", code);
-        println!("[krata] looping forever");
+        let mut store = XsdClient::open().await?;
+        store
+            .write_string("krata/guest/exit-code", &code.to_string())
+            .await?;
+        drop(store);
         loop {
             sleep(Duration::from_secs(1)).await;
         }

controller/src/ctl/launch.rs

@@ -4,11 +4,10 @@ use advmac::MacAddr6;
 use anyhow::{anyhow, Result};
 use ipnetwork::Ipv4Network;
 use krata::{
-    LaunchChannels, LaunchInfo, LaunchNetwork, LaunchNetworkIpv4, LaunchNetworkIpv6,
-    LaunchNetworkResolver,
+    LaunchInfo, LaunchNetwork, LaunchNetworkIpv4, LaunchNetworkIpv6, LaunchNetworkResolver,
 };
 use uuid::Uuid;
-use xenclient::{DomainConfig, DomainDisk, DomainEventChannel, DomainNetworkInterface};
+use xenclient::{DomainConfig, DomainDisk, DomainNetworkInterface};
 use xenstore::client::XsdInterface;
 
 use crate::image::{name::ImageName, ImageCompiler, ImageInfo};
@@ -76,9 +75,6 @@ impl ControllerLaunch<'_> {
             }),
             env: request.env,
             run: request.run,
-            channels: LaunchChannels {
-                exit: "krata-exit".to_string(),
-            },
         };
 
         let cfgblk = ConfigBlock::new(&uuid, &image_info)?;
@@ -137,7 +133,7 @@ impl ControllerLaunch<'_> {
                 script: None,
             }],
             filesystems: vec![],
-            event_channels: vec![DomainEventChannel { name: "krata-exit" }],
+            event_channels: vec![],
             extra_keys: vec![
                 ("krata/uuid".to_string(), uuid.to_string()),
                 (
@@ -177,6 +173,7 @@ impl ControllerLaunch<'_> {
                     gateway_mac_string.clone(),
                 ),
             ],
+            extra_rw_paths: vec!["krata/guest".to_string()],
         };
         match self.context.xen.create(&config).await {
             Ok(domid) => Ok((uuid, domid)),

libs/xen/xenclient/examples/boot.rs

@@ -27,6 +27,7 @@ async fn main() -> Result<()> {
         vifs: vec![],
         filesystems: vec![],
         extra_keys: vec![],
+        extra_rw_paths: vec![],
         event_channels: vec![],
     };
     let domid = client.create(&config).await?;

libs/xen/xenclient/src/lib.rs

@@ -79,6 +79,7 @@ pub struct DomainConfig<'a> {
     pub filesystems: Vec<DomainFilesystem<'a>>,
     pub event_channels: Vec<DomainEventChannel<'a>>,
     pub extra_keys: Vec<(String, String)>,
+    pub extra_rw_paths: Vec<String>,
 }
 
 impl XenClient {
@@ -213,6 +214,11 @@ impl XenClient {
                     .await?;
             }
 
+            for path in &config.extra_rw_paths {
+                tx.mknod(format!("{}/{}", dom_path, path).as_str(), rw_perm)
+                    .await?;
+            }
+
             tx.commit().await?;
         }
 

shared/src/lib.rs

@@ -25,15 +25,9 @@ pub struct LaunchNetwork {
     pub resolver: LaunchNetworkResolver,
 }
 
-#[derive(Serialize, Deserialize, Debug)]
-pub struct LaunchChannels {
-    pub exit: String,
-}
-
 #[derive(Serialize, Deserialize, Debug)]
 pub struct LaunchInfo {
     pub network: Option<LaunchNetwork>,
     pub env: Option<Vec<String>>,
     pub run: Option<Vec<String>>,
-    pub channels: LaunchChannels,
 }