utilize async processing for console and child exit events

container/Cargo.toml

@@ -25,6 +25,9 @@ features = ["process"]
 [dependencies.krata]
 path = "../shared"
 
+[dependencies.xenevtchn]
+path = "../libs/xen/xenevtchn"
+
 [lib]
 path = "src/lib.rs"
 

container/src/background.rs

@@ -0,0 +1,49 @@
+use std::time::Duration;
+
+use crate::childwait::{ChildEvent, ChildWait};
+use anyhow::Result;
+use nix::{libc::c_int, unistd::Pid};
+use tokio::{select, time::sleep};
+
+pub struct ContainerBackground {
+    child: Pid,
+    wait: ChildWait,
+}
+
+impl ContainerBackground {
+    pub async fn new(child: Pid) -> Result<ContainerBackground> {
+        Ok(ContainerBackground {
+            child,
+            wait: ChildWait::new()?,
+        })
+    }
+
+    pub async fn run(&mut self) -> Result<()> {
+        loop {
+            select! {
+                event = self.wait.recv() => match event {
+                    Some(event) => self.child_event(event).await?,
+                    None => {
+                        break;
+                    }
+                }
+            };
+        }
+        Ok(())
+    }
+
+    async fn child_event(&mut self, event: ChildEvent) -> Result<()> {
+        if event.pid == self.child {
+            self.death(event.status).await?;
+        }
+        Ok(())
+    }
+
+    async fn death(&mut self, code: c_int) -> Result<()> {
+        println!("[krata] container process exited: status = {}", code);
+        println!("[krata] looping forever");
+        loop {
+            sleep(Duration::from_secs(1)).await;
+        }
+    }
+}

container/src/childwait.rs

@@ -0,0 +1,84 @@
+use std::{
+    ptr::addr_of_mut,
+    sync::{
+        atomic::{AtomicBool, Ordering},
+        Arc,
+    },
+    thread::{self, JoinHandle},
+};
+
+use anyhow::Result;
+use log::warn;
+use nix::{
+    libc::{c_int, wait},
+    unistd::Pid,
+};
+use tokio::sync::mpsc::{channel, Receiver, Sender};
+
+const CHILD_WAIT_QUEUE_LEN: usize = 10;
+
+#[derive(Clone, Copy, Debug)]
+pub struct ChildEvent {
+    pub pid: Pid,
+    pub status: c_int,
+}
+
+pub struct ChildWait {
+    receiver: Receiver<ChildEvent>,
+    signal: Arc<AtomicBool>,
+    _task: JoinHandle<()>,
+}
+
+impl ChildWait {
+    pub fn new() -> Result<ChildWait> {
+        let (sender, receiver) = channel(CHILD_WAIT_QUEUE_LEN);
+        let signal = Arc::new(AtomicBool::new(false));
+        let mut processor = ChildWaitTask {
+            sender,
+            signal: signal.clone(),
+        };
+        let task = thread::spawn(move || {
+            if let Err(error) = processor.process() {
+                warn!("failed to process child updates: {}", error);
+            }
+        });
+        Ok(ChildWait {
+            receiver,
+            signal,
+            _task: task,
+        })
+    }
+
+    pub async fn recv(&mut self) -> Option<ChildEvent> {
+        self.receiver.recv().await
+    }
+}
+
+struct ChildWaitTask {
+    sender: Sender<ChildEvent>,
+    signal: Arc<AtomicBool>,
+}
+
+impl ChildWaitTask {
+    fn process(&mut self) -> Result<()> {
+        loop {
+            let mut status: c_int = 0;
+            let pid = unsafe { wait(addr_of_mut!(status)) };
+            let event = ChildEvent {
+                pid: Pid::from_raw(pid),
+                status,
+            };
+            let _ = self.sender.try_send(event);
+
+            if self.signal.load(Ordering::Acquire) {
+                return Ok(());
+            }
+        }
+    }
+}
+
+impl Drop for ChildWait {
+    fn drop(&mut self) {
+        self.signal.store(true, Ordering::Release);
+    }
+}

container/src/init.rs

@@ -3,7 +3,7 @@ use futures::stream::TryStreamExt;
 use ipnetwork::IpNetwork;
 use krata::{LaunchInfo, LaunchNetwork};
 use log::{trace, warn};
-use nix::libc::{c_int, dup2, ioctl, wait};
+use nix::libc::{dup2, ioctl};
 use nix::unistd::{execve, fork, ForkResult, Pid};
 use oci_spec::image::{Config, ImageConfiguration};
 use std::ffi::{CStr, CString};
@@ -13,14 +13,13 @@ use std::os::fd::AsRawFd;
 use std::os::linux::fs::MetadataExt;
 use std::os::unix::fs::{chroot, PermissionsExt};
 use std::path::{Path, PathBuf};
-use std::ptr::addr_of_mut;
 use std::str::FromStr;
-use std::thread::sleep;
-use std::time::Duration;
 use std::{fs, io};
 use sys_mount::{FilesystemType, Mount, MountFlags};
 use walkdir::WalkDir;
 
+use crate::background::ContainerBackground;
+
 const IMAGE_BLOCK_DEVICE_PATH: &str = "/dev/xvda";
 const CONFIG_BLOCK_DEVICE_PATH: &str = "/dev/xvdb";
 
@@ -84,7 +83,7 @@ impl ContainerInit {
         }
 
         if let Some(cfg) = config.config() {
-            self.run(cfg, &launch)?;
+            self.run(cfg, &launch).await?;
         } else {
             return Err(anyhow!(
                 "unable to determine what to execute, image config doesn't tell us"
@@ -367,7 +366,7 @@ impl ContainerInit {
         Ok(())
     }
 
-    fn run(&mut self, config: &Config, launch: &LaunchInfo) -> Result<()> {
+    async fn run(&mut self, config: &Config, launch: &LaunchInfo) -> Result<()> {
         let mut cmd = match config.cmd() {
             None => vec![],
             Some(value) => value.clone(),
@@ -408,7 +407,7 @@ impl ContainerInit {
         }
 
         std::env::set_current_dir(&working_dir)?;
-        self.fork_and_exec(&path_cstr, cmd_cstr, env_cstr)?;
+        self.fork_and_exec(&path_cstr, cmd_cstr, env_cstr).await?;
         Ok(())
     }
 
@@ -420,9 +419,14 @@ impl ContainerInit {
         Ok(results)
     }
 
-    fn fork_and_exec(&mut self, path: &CStr, cmd: Vec<CString>, env: Vec<CString>) -> Result<()> {
+    async fn fork_and_exec(
+        &mut self,
+        path: &CStr,
+        cmd: Vec<CString>,
+        env: Vec<CString>,
+    ) -> Result<()> {
         match unsafe { fork()? } {
-            ForkResult::Parent { child } => self.background(child),
+            ForkResult::Parent { child } => self.background(child).await,
             ForkResult::Child => {
                 unsafe { nix::libc::setsid() };
                 let result = unsafe { ioctl(io::stdin().as_raw_fd(), nix::libc::TIOCSCTTY, 0) };
@@ -435,21 +439,9 @@ impl ContainerInit {
         }
     }
 
-    fn background(&mut self, executed: Pid) -> Result<()> {
-        loop {
-            let mut status: c_int = 0;
-            let pid = unsafe { wait(addr_of_mut!(status)) };
-            if executed.as_raw() == pid {
-                return self.death(status);
-            }
-        }
-    }
-
-    fn death(&mut self, code: c_int) -> Result<()> {
-        println!("[krata] container process exited: status = {}", code);
-        println!("[krata] looping forever");
-        loop {
-            sleep(Duration::from_secs(1));
-        }
+    async fn background(&mut self, executed: Pid) -> Result<()> {
+        let mut background = ContainerBackground::new(executed).await?;
+        background.run().await?;
+        Ok(())
     }
 }

container/src/lib.rs

@@ -1 +1,3 @@
+pub mod background;
+pub mod childwait;
 pub mod init;

controller/Cargo.toml

@@ -26,6 +26,8 @@ oci-spec = { workspace = true }
 backhand = { workspace = true }
 uuid = { workspace = true }
 ipnetwork = { workspace = true }
+tokio = { workspace = true }
+futures = { workspace = true }
 
 [dependencies.krata]
 path = "../shared"

controller/bin/control.rs

@@ -53,7 +53,8 @@ enum Commands {
     },
 }
 
-fn main() -> Result<()> {
+#[tokio::main]
+async fn main() -> Result<()> {
     env_logger::Builder::from_env(Env::default().default_filter_or("warn")).init();
 
     let args = ControllerArgs::parse();
@@ -99,7 +100,7 @@ fn main() -> Result<()> {
             println!("launched container: {}", uuid);
             if attach {
                 let mut console = ControllerConsole::new(&mut context);
-                console.perform(&uuid.to_string())?;
+                console.perform(&uuid.to_string()).await?;
             }
         }
 
@@ -110,7 +111,7 @@ fn main() -> Result<()> {
 
         Commands::Console { container } => {
             let mut console = ControllerConsole::new(&mut context);
-            console.perform(&container)?;
+            console.perform(&container).await?;
         }
 
         Commands::List { .. } => {

controller/src/console.rs

@@ -0,0 +1,74 @@
+use std::{
+    io::{stdin, stdout},
+    os::fd::{AsRawFd, FromRawFd},
+};
+
+use anyhow::Result;
+use futures::future::join_all;
+use log::warn;
+use std::process::exit;
+use termion::raw::IntoRawMode;
+use tokio::{
+    fs::File,
+    io::{AsyncReadExt, AsyncWriteExt},
+};
+
+pub struct XenConsole {
+    xen_read_handle: File,
+    xen_write_handle: File,
+}
+
+impl XenConsole {
+    pub async fn new(tty: &str) -> Result<XenConsole> {
+        let xen_read_handle = File::options().read(true).write(false).open(tty).await?;
+        let xen_write_handle = File::options().read(false).write(true).open(tty).await?;
+        Ok(XenConsole {
+            xen_read_handle,
+            xen_write_handle,
+        })
+    }
+
+    pub async fn attach(self) -> Result<()> {
+        let stdin = stdin();
+        let terminal = stdout().into_raw_mode()?;
+        let stdout = unsafe { File::from_raw_fd(terminal.as_raw_fd()) };
+        let reader_task = tokio::task::spawn(async move {
+            if let Err(error) = XenConsole::copy_stdout(stdout, self.xen_read_handle).await {
+                warn!("failed to copy console output: {}", error);
+            }
+        });
+        let writer_task = tokio::task::spawn(async move {
+            if let Err(error) = XenConsole::intercept_stdin(
+                unsafe { File::from_raw_fd(stdin.as_raw_fd()) },
+                self.xen_write_handle,
+            )
+            .await
+            {
+                warn!("failed to intercept stdin: {}", error);
+            }
+        });
+
+        join_all(vec![reader_task, writer_task]).await;
+        Ok(())
+    }
+
+    async fn copy_stdout(mut stdout: File, mut console: File) -> Result<()> {
+        let mut buffer = vec![0u8; 256];
+        loop {
+            let size = console.read(&mut buffer).await?;
+            stdout.write_all(&buffer[0..size]).await?;
+            stdout.flush().await?;
+        }
+    }
+
+    async fn intercept_stdin(mut stdin: File, mut console: File) -> Result<()> {
+        let mut buffer = vec![0u8; 60];
+        loop {
+            let size = stdin.read(&mut buffer).await?;
+            if size == 1 && buffer[0] == 0x1d {
+                exit(0);
+            }
+            console.write_all(&buffer[0..size]).await?;
+        }
+    }
+}

controller/src/ctl/console.rs

@@ -1,11 +1,6 @@
-use std::{
-    io::{self, Read, Write},
-    process::exit,
-    thread,
-};
-
 use anyhow::{anyhow, Result};
-use termion::raw::IntoRawMode;
+
+use crate::console::XenConsole;
 
 use super::ControllerContext;
 
@@ -18,49 +13,15 @@ impl ControllerConsole<'_> {
         ControllerConsole { context }
     }
 
-    pub fn perform(&mut self, id: &str) -> Result<()> {
+    pub async fn perform(&mut self, id: &str) -> Result<()> {
         let info = self
             .context
             .resolve(id)?
             .ok_or_else(|| anyhow!("unable to resolve container: {}", id))?;
         let domid = info.domid;
-        let (mut read, mut write) = self.context.xen.open_console(domid)?;
-        let mut stdin = io::stdin();
-        let is_tty = termion::is_tty(&stdin);
-        let mut stdout_for_exit = io::stdout().into_raw_mode()?;
-        thread::spawn(move || {
-            let mut buffer = vec![0u8; 60];
-            loop {
-                let size = stdin.read(&mut buffer).expect("failed to read stdin");
-                if is_tty && size == 1 && buffer[0] == 0x1d {
-                    stdout_for_exit
-                        .suspend_raw_mode()
-                        .expect("failed to disable raw mode");
-                    stdout_for_exit.flush().expect("failed to flush stdout");
-                    exit(0);
-                }
-                write
-                    .write_all(&buffer[0..size])
-                    .expect("failed to write to domain console");
-                write.flush().expect("failed to flush domain console");
-            }
-        });
-
-        let mut buffer = vec![0u8; 256];
-        if is_tty {
-            let mut stdout = io::stdout().into_raw_mode()?;
-            loop {
-                let size = read.read(&mut buffer)?;
-                stdout.write_all(&buffer[0..size])?;
-                stdout.flush()?;
-            }
-        } else {
-            let mut stdout = io::stdout();
-            loop {
-                let size = read.read(&mut buffer)?;
-                stdout.write_all(&buffer[0..size])?;
-                stdout.flush()?;
-            }
-        }
+        let tty = self.context.xen.get_console_path(domid)?;
+        let console = XenConsole::new(&tty).await?;
+        console.attach().await?;
+        Ok(())
     }
 }

controller/src/ctl/launch.rs

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

controller/src/lib.rs

@@ -1,3 +1,4 @@
 pub mod autoloop;
+pub mod console;
 pub mod ctl;
 pub mod image;

libs/xen/xenclient/examples/boot.rs

@@ -26,6 +26,7 @@ fn main() -> Result<()> {
         vifs: vec![],
         filesystems: vec![],
         extra_keys: vec![],
+        event_channels: vec![],
     };
     let domid = client.create(&config)?;
     println!("created domain {}", domid);

libs/xen/xenclient/src/lib.rs

@@ -11,7 +11,7 @@ use crate::error::{Error, Result};
 use crate::x86::X86BootSetup;
 use log::{trace, warn};
 
-use std::fs::{read, File, OpenOptions};
+use std::fs::read;
 use std::path::PathBuf;
 use std::str::FromStr;
 use std::thread;
@@ -59,6 +59,11 @@ pub struct DomainNetworkInterface<'a> {
 #[derive(Debug)]
 pub struct DomainConsole {}
 
+#[derive(Debug)]
+pub struct DomainEventChannel<'a> {
+    pub name: &'a str,
+}
+
 #[derive(Debug)]
 pub struct DomainConfig<'a> {
     pub backend_domid: u32,
@@ -72,6 +77,7 @@ pub struct DomainConfig<'a> {
     pub consoles: Vec<DomainConsole>,
     pub vifs: Vec<DomainNetworkInterface<'a>>,
     pub filesystems: Vec<DomainFilesystem<'a>>,
+    pub event_channels: Vec<DomainEventChannel<'a>>,
     pub extra_keys: Vec<(String, String)>,
 }
 
@@ -99,90 +105,6 @@ impl XenClient {
         }
     }
 
-    pub fn destroy(&mut self, domid: u32) -> Result<()> {
-        if let Err(err) = self.destroy_store(domid) {
-            warn!("failed to destroy store for domain {}: {}", domid, err);
-        }
-        self.call.destroy_domain(domid)?;
-        Ok(())
-    }
-
-    fn destroy_store(&mut self, domid: u32) -> Result<()> {
-        let dom_path = self.store.get_domain_path(domid)?;
-        let vm_path = self.store.read_string(&format!("{}/vm", dom_path))?;
-        if vm_path.is_empty() {
-            return Err(Error::DomainNonExistent);
-        }
-
-        let mut backend_paths: Vec<String> = Vec::new();
-        let console_frontend_path = format!("{}/console", dom_path);
-        let console_backend_path = self
-            .store
-            .read_string_optional(format!("{}/backend", console_frontend_path).as_str())?;
-
-        for device_category in self
-            .store
-            .list_any(format!("{}/device", dom_path).as_str())?
-        {
-            for device_id in self
-                .store
-                .list_any(format!("{}/device/{}", dom_path, device_category).as_str())?
-            {
-                let device_path = format!("{}/device/{}/{}", dom_path, device_category, device_id);
-                let backend_path = self
-                    .store
-                    .read_string(format!("{}/backend", device_path).as_str())?;
-                backend_paths.push(backend_path);
-            }
-        }
-
-        for backend in &backend_paths {
-            let state_path = format!("{}/state", backend);
-            let online_path = format!("{}/online", backend);
-            let mut tx = self.store.transaction()?;
-            let state = tx.read_string(&state_path)?;
-            if state.is_empty() {
-                break;
-            }
-            tx.write_string(&online_path, "0")?;
-            if !state.is_empty() && u32::from_str(&state).unwrap_or(0) != 6 {
-                tx.write_string(&state_path, "5")?;
-            }
-            tx.commit()?;
-
-            let mut count: u32 = 0;
-            loop {
-                if count >= 100 {
-                    warn!("unable to safely destroy backend: {}", backend);
-                    break;
-                }
-                let state = self.store.read_string(&state_path)?;
-                let state = i64::from_str(&state).unwrap_or(-1);
-                if state == 6 {
-                    break;
-                }
-                thread::sleep(Duration::from_millis(100));
-                count += 1;
-            }
-        }
-
-        let mut tx = self.store.transaction()?;
-        let mut backend_removals: Vec<String> = Vec::new();
-        backend_removals.extend_from_slice(backend_paths.as_slice());
-        if let Some(backend) = console_backend_path {
-            backend_removals.push(backend);
-        }
-        for path in &backend_removals {
-            let path = PathBuf::from(path);
-            let parent = path.parent().ok_or(Error::PathParentNotFound)?;
-            tx.rm(parent.to_str().ok_or(Error::PathStringConversion)?)?;
-        }
-        tx.rm(&vm_path)?;
-        tx.rm(&dom_path)?;
-        tx.commit()?;
-        Ok(())
-    }
-
     fn init(&mut self, domid: u32, domain: &CreateDomain, config: &DomainConfig) -> Result<()> {
         trace!(
             "XenClient init domid={} domain={:?} config={:?}",
@@ -401,6 +323,18 @@ impl XenClient {
                 vif,
             )?;
         }
+
+        for channel in &config.event_channels {
+            let id = self
+                .call
+                .evtchn_alloc_unbound(domid, config.backend_domid)?;
+            let channel_path = format!("{}/evtchn/{}", dom_path, channel.name);
+            self.store
+                .write_string(&format!("{}/name", channel_path), channel.name)?;
+            self.store
+                .write_string(&format!("{}/channel", channel_path), &id.to_string())?;
+        }
+
         self.call.unpause_domain(domid)?;
         Ok(())
     }
@@ -673,7 +607,91 @@ impl XenClient {
         Ok(())
     }
 
-    pub fn open_console(&mut self, domid: u32) -> Result<(File, File)> {
+    pub fn destroy(&mut self, domid: u32) -> Result<()> {
+        if let Err(err) = self.destroy_store(domid) {
+            warn!("failed to destroy store for domain {}: {}", domid, err);
+        }
+        self.call.destroy_domain(domid)?;
+        Ok(())
+    }
+
+    fn destroy_store(&mut self, domid: u32) -> Result<()> {
+        let dom_path = self.store.get_domain_path(domid)?;
+        let vm_path = self.store.read_string(&format!("{}/vm", dom_path))?;
+        if vm_path.is_empty() {
+            return Err(Error::DomainNonExistent);
+        }
+
+        let mut backend_paths: Vec<String> = Vec::new();
+        let console_frontend_path = format!("{}/console", dom_path);
+        let console_backend_path = self
+            .store
+            .read_string_optional(format!("{}/backend", console_frontend_path).as_str())?;
+
+        for device_category in self
+            .store
+            .list_any(format!("{}/device", dom_path).as_str())?
+        {
+            for device_id in self
+                .store
+                .list_any(format!("{}/device/{}", dom_path, device_category).as_str())?
+            {
+                let device_path = format!("{}/device/{}/{}", dom_path, device_category, device_id);
+                let backend_path = self
+                    .store
+                    .read_string(format!("{}/backend", device_path).as_str())?;
+                backend_paths.push(backend_path);
+            }
+        }
+
+        for backend in &backend_paths {
+            let state_path = format!("{}/state", backend);
+            let online_path = format!("{}/online", backend);
+            let mut tx = self.store.transaction()?;
+            let state = tx.read_string(&state_path)?;
+            if state.is_empty() {
+                break;
+            }
+            tx.write_string(&online_path, "0")?;
+            if !state.is_empty() && u32::from_str(&state).unwrap_or(0) != 6 {
+                tx.write_string(&state_path, "5")?;
+            }
+            tx.commit()?;
+
+            let mut count: u32 = 0;
+            loop {
+                if count >= 100 {
+                    warn!("unable to safely destroy backend: {}", backend);
+                    break;
+                }
+                let state = self.store.read_string(&state_path)?;
+                let state = i64::from_str(&state).unwrap_or(-1);
+                if state == 6 {
+                    break;
+                }
+                thread::sleep(Duration::from_millis(100));
+                count += 1;
+            }
+        }
+
+        let mut tx = self.store.transaction()?;
+        let mut backend_removals: Vec<String> = Vec::new();
+        backend_removals.extend_from_slice(backend_paths.as_slice());
+        if let Some(backend) = console_backend_path {
+            backend_removals.push(backend);
+        }
+        for path in &backend_removals {
+            let path = PathBuf::from(path);
+            let parent = path.parent().ok_or(Error::PathParentNotFound)?;
+            tx.rm(parent.to_str().ok_or(Error::PathStringConversion)?)?;
+        }
+        tx.rm(&vm_path)?;
+        tx.rm(&dom_path)?;
+        tx.commit()?;
+        Ok(())
+    }
+
+    pub fn get_console_path(&mut self, domid: u32) -> Result<String> {
         let dom_path = self.store.get_domain_path(domid)?;
         let console_tty_path = format!("{}/console/tty", dom_path);
         let mut tty: Option<String> = None;
@@ -687,8 +705,6 @@ impl XenClient {
         let Some(tty) = tty else {
             return Err(Error::TtyNotFound);
         };
-        let read = OpenOptions::new().read(true).write(false).open(&tty)?;
-        let write = OpenOptions::new().read(false).write(true).open(&tty)?;
-        Ok((read, write))
+        Ok(tty)
     }
 }

scripts/kratactl-debug.sh

@@ -10,5 +10,5 @@ REAL_SCRIPT="$(realpath "${0}")"
 cd "$(dirname "${REAL_SCRIPT}")/.."
 ./initrd/build.sh -q
 sudo cp "target/initrd/initrd" "/var/lib/krata/default/initrd"
-cargo build -q --target x86_64-unknown-linux-gnu --bin kratactl
+cargo build --target x86_64-unknown-linux-gnu --bin kratactl
 exec sudo RUST_LOG="${RUST_LOG}" target/x86_64-unknown-linux-gnu/debug/kratactl "${@}"

scripts/kratanet-debug.sh

@@ -8,5 +8,5 @@ fi
 
 REAL_SCRIPT="$(realpath "${0}")"
 cd "$(dirname "${REAL_SCRIPT}")/.."
-cargo build -q --target x86_64-unknown-linux-gnu --bin kratanet
+cargo build --target x86_64-unknown-linux-gnu --bin kratanet
 exec sudo RUST_LOG="${RUST_LOG}" target/x86_64-unknown-linux-gnu/debug/kratanet "${@}"

shared/src/lib.rs

@@ -25,9 +25,15 @@ 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,
 }