mirror of
https://github.com/edera-dev/krata.git
synced 2025-11-04 07:39:39 +00:00
feat: implement kernel / initrd oci image support (#103)
* feat: implement kernel / initrd oci image support * fix: implement image urls more faithfully
This commit is contained in:
Alex Zenla
GitHub
348
crates/daemon/src/reconcile/guest/mod.rs
Normal file
348
crates/daemon/src/reconcile/guest/mod.rs
Normal file
@ -0,0 +1,348 @@
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use std::{
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collections::{hash_map::Entry, HashMap},
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path::PathBuf,
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sync::Arc,
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time::Duration,
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};
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use anyhow::Result;
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use krata::v1::{
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common::{Guest, GuestErrorInfo, GuestExitInfo, GuestNetworkState, GuestState, GuestStatus},
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control::GuestChangedEvent,
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};
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use krataoci::packer::service::OciPackerService;
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use kratart::{GuestInfo, Runtime};
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use log::{error, info, trace, warn};
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use tokio::{
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select,
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sync::{
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mpsc::{channel, Receiver, Sender},
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Mutex, RwLock,
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},
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task::JoinHandle,
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time::sleep,
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};
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use uuid::Uuid;
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use crate::{
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db::GuestStore,
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event::{DaemonEvent, DaemonEventContext},
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glt::GuestLookupTable,
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};
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use self::start::GuestStarter;
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mod start;
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const PARALLEL_LIMIT: u32 = 5;
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#[derive(Debug)]
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enum GuestReconcilerResult {
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Unchanged,
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Changed { rerun: bool },
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}
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struct GuestReconcilerEntry {
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task: JoinHandle<()>,
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sender: Sender<()>,
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}
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impl Drop for GuestReconcilerEntry {
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fn drop(&mut self) {
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self.task.abort();
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}
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}
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#[derive(Clone)]
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pub struct GuestReconciler {
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glt: GuestLookupTable,
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guests: GuestStore,
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events: DaemonEventContext,
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runtime: Runtime,
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packer: OciPackerService,
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kernel_path: PathBuf,
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initrd_path: PathBuf,
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tasks: Arc<Mutex<HashMap<Uuid, GuestReconcilerEntry>>>,
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guest_reconciler_notify: Sender<Uuid>,
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reconcile_lock: Arc<RwLock<()>>,
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}
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impl GuestReconciler {
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#[allow(clippy::too_many_arguments)]
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pub fn new(
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glt: GuestLookupTable,
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guests: GuestStore,
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events: DaemonEventContext,
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runtime: Runtime,
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packer: OciPackerService,
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guest_reconciler_notify: Sender<Uuid>,
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kernel_path: PathBuf,
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initrd_path: PathBuf,
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) -> Result<Self> {
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Ok(Self {
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glt,
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guests,
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events,
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runtime,
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packer,
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kernel_path,
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initrd_path,
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tasks: Arc::new(Mutex::new(HashMap::new())),
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guest_reconciler_notify,
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reconcile_lock: Arc::new(RwLock::with_max_readers((), PARALLEL_LIMIT)),
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})
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}
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pub async fn launch(self, mut notify: Receiver<Uuid>) -> Result<JoinHandle<()>> {
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Ok(tokio::task::spawn(async move {
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if let Err(error) = self.reconcile_runtime(true).await {
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error!("runtime reconciler failed: {}", error);
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}
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loop {
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select! {
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x = notify.recv() => match x {
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None => {
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break;
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},
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Some(uuid) => {
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if let Err(error) = self.launch_task_if_needed(uuid).await {
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error!("failed to start guest reconciler task {}: {}", uuid, error);
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}
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let map = self.tasks.lock().await;
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if let Some(entry) = map.get(&uuid) {
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if let Err(error) = entry.sender.send(()).await {
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error!("failed to notify guest reconciler task {}: {}", uuid, error);
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}
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}
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}
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},
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_ = sleep(Duration::from_secs(5)) => {
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if let Err(error) = self.reconcile_runtime(false).await {
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error!("runtime reconciler failed: {}", error);
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}
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}
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};
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}
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}))
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}
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pub async fn reconcile_runtime(&self, initial: bool) -> Result<()> {
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let _permit = self.reconcile_lock.write().await;
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trace!("reconciling runtime");
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let runtime_guests = self.runtime.list().await?;
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let stored_guests = self.guests.list().await?;
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let non_existent_guests = runtime_guests
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.iter()
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.filter(|x| !stored_guests.iter().any(|g| *g.0 == x.uuid))
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.collect::<Vec<_>>();
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for guest in non_existent_guests {
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warn!("destroying unknown runtime guest {}", guest.uuid);
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if let Err(error) = self.runtime.destroy(guest.uuid).await {
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error!(
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"failed to destroy unknown runtime guest {}: {}",
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guest.uuid, error
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);
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}
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self.guests.remove(guest.uuid).await?;
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}
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for (uuid, mut stored_guest) in stored_guests {
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let previous_guest = stored_guest.clone();
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let runtime_guest = runtime_guests.iter().find(|x| x.uuid == uuid);
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match runtime_guest {
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None => {
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let mut state = stored_guest.state.as_mut().cloned().unwrap_or_default();
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if state.status() == GuestStatus::Started {
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state.status = GuestStatus::Starting.into();
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}
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stored_guest.state = Some(state);
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}
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Some(runtime) => {
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self.glt.associate(uuid, runtime.domid).await;
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let mut state = stored_guest.state.as_mut().cloned().unwrap_or_default();
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if let Some(code) = runtime.state.exit_code {
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state.status = GuestStatus::Exited.into();
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state.exit_info = Some(GuestExitInfo { code });
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} else {
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state.status = GuestStatus::Started.into();
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}
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state.network = Some(guestinfo_to_networkstate(runtime));
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stored_guest.state = Some(state);
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}
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}
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let changed = stored_guest != previous_guest;
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if changed || initial {
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self.guests.update(uuid, stored_guest).await?;
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let _ = self.guest_reconciler_notify.try_send(uuid);
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}
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}
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Ok(())
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}
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pub async fn reconcile(&self, uuid: Uuid) -> Result<bool> {
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let _runtime_reconcile_permit = self.reconcile_lock.read().await;
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let Some(mut guest) = self.guests.read(uuid).await? else {
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warn!(
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"notified of reconcile for guest {} but it didn't exist",
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uuid
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);
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return Ok(false);
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};
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info!("reconciling guest {}", uuid);
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self.events
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.send(DaemonEvent::GuestChanged(GuestChangedEvent {
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guest: Some(guest.clone()),
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}))?;
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let start_status = guest.state.as_ref().map(|x| x.status()).unwrap_or_default();
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let result = match start_status {
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GuestStatus::Starting => self.start(uuid, &mut guest).await,
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GuestStatus::Exited => self.exited(&mut guest).await,
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GuestStatus::Destroying => self.destroy(uuid, &mut guest).await,
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_ => Ok(GuestReconcilerResult::Unchanged),
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};
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let result = match result {
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Ok(result) => result,
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Err(error) => {
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guest.state = Some(guest.state.as_mut().cloned().unwrap_or_default());
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guest.state.as_mut().unwrap().status = GuestStatus::Failed.into();
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guest.state.as_mut().unwrap().error_info = Some(GuestErrorInfo {
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message: error.to_string(),
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});
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warn!("failed to start guest {}: {}", guest.id, error);
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GuestReconcilerResult::Changed { rerun: false }
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}
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};
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info!("reconciled guest {}", uuid);
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let status = guest.state.as_ref().map(|x| x.status()).unwrap_or_default();
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let destroyed = status == GuestStatus::Destroyed;
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let rerun = if let GuestReconcilerResult::Changed { rerun } = result {
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let event = DaemonEvent::GuestChanged(GuestChangedEvent {
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guest: Some(guest.clone()),
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});
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if destroyed {
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self.guests.remove(uuid).await?;
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let mut map = self.tasks.lock().await;
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map.remove(&uuid);
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} else {
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self.guests.update(uuid, guest.clone()).await?;
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}
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self.events.send(event)?;
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rerun
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} else {
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false
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};
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Ok(rerun)
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}
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async fn start(&self, uuid: Uuid, guest: &mut Guest) -> Result<GuestReconcilerResult> {
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let starter = GuestStarter {
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kernel_path: &self.kernel_path,
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initrd_path: &self.initrd_path,
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packer: &self.packer,
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glt: &self.glt,
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runtime: &self.runtime,
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};
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starter.start(uuid, guest).await
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}
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async fn exited(&self, guest: &mut Guest) -> Result<GuestReconcilerResult> {
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if let Some(ref mut state) = guest.state {
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state.set_status(GuestStatus::Destroying);
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Ok(GuestReconcilerResult::Changed { rerun: true })
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} else {
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Ok(GuestReconcilerResult::Unchanged)
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}
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}
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async fn destroy(&self, uuid: Uuid, guest: &mut Guest) -> Result<GuestReconcilerResult> {
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if let Err(error) = self.runtime.destroy(uuid).await {
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trace!("failed to destroy runtime guest {}: {}", uuid, error);
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}
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let domid = guest.state.as_ref().map(|x| x.domid);
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if let Some(domid) = domid {
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self.glt.remove(uuid, domid).await;
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}
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info!("destroyed guest {}", uuid);
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guest.state = Some(GuestState {
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status: GuestStatus::Destroyed.into(),
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network: None,
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exit_info: None,
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error_info: None,
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host: self.glt.host_uuid().to_string(),
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domid: domid.unwrap_or(u32::MAX),
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});
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Ok(GuestReconcilerResult::Changed { rerun: false })
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}
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async fn launch_task_if_needed(&self, uuid: Uuid) -> Result<()> {
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let mut map = self.tasks.lock().await;
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match map.entry(uuid) {
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Entry::Occupied(_) => {}
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Entry::Vacant(entry) => {
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entry.insert(self.launch_task(uuid).await?);
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}
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}
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Ok(())
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}
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async fn launch_task(&self, uuid: Uuid) -> Result<GuestReconcilerEntry> {
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let this = self.clone();
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let (sender, mut receiver) = channel(10);
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let task = tokio::task::spawn(async move {
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'notify_loop: loop {
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if receiver.recv().await.is_none() {
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break 'notify_loop;
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}
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'rerun_loop: loop {
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let rerun = match this.reconcile(uuid).await {
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Ok(rerun) => rerun,
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Err(error) => {
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error!("failed to reconcile guest {}: {}", uuid, error);
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false
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}
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};
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if rerun {
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continue 'rerun_loop;
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}
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break 'rerun_loop;
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}
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}
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});
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Ok(GuestReconcilerEntry { task, sender })
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}
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}
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pub fn guestinfo_to_networkstate(info: &GuestInfo) -> GuestNetworkState {
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GuestNetworkState {
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guest_ipv4: info.guest_ipv4.map(|x| x.to_string()).unwrap_or_default(),
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guest_ipv6: info.guest_ipv6.map(|x| x.to_string()).unwrap_or_default(),
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guest_mac: info.guest_mac.as_ref().cloned().unwrap_or_default(),
|
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gateway_ipv4: info.gateway_ipv4.map(|x| x.to_string()).unwrap_or_default(),
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gateway_ipv6: info.gateway_ipv6.map(|x| x.to_string()).unwrap_or_default(),
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gateway_mac: info.gateway_mac.as_ref().cloned().unwrap_or_default(),
|
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}
|
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}
|
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182
crates/daemon/src/reconcile/guest/start.rs
Normal file
182
crates/daemon/src/reconcile/guest/start.rs
Normal file
@ -0,0 +1,182 @@
|
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use std::collections::HashMap;
|
||||
use std::path::{Path, PathBuf};
|
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|
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use anyhow::{anyhow, Result};
|
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use futures::StreamExt;
|
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use krata::launchcfg::LaunchPackedFormat;
|
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use krata::v1::common::GuestOciImageSpec;
|
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use krata::v1::common::{guest_image_spec::Image, Guest, GuestState, GuestStatus, OciImageFormat};
|
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use krataoci::packer::{service::OciPackerService, OciPackedFormat};
|
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use kratart::{launch::GuestLaunchRequest, Runtime};
|
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use log::info;
|
||||
|
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use tokio::fs::{self, File};
|
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use tokio::io::AsyncReadExt;
|
||||
use tokio_tar::Archive;
|
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use uuid::Uuid;
|
||||
|
||||
use crate::{
|
||||
glt::GuestLookupTable,
|
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reconcile::guest::{guestinfo_to_networkstate, GuestReconcilerResult},
|
||||
};
|
||||
|
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// if a kernel is >= 100MB, that's kinda scary.
|
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const OCI_SPEC_TAR_FILE_MAX_SIZE: usize = 100 * 1024 * 1024;
|
||||
|
||||
pub struct GuestStarter<'a> {
|
||||
pub kernel_path: &'a Path,
|
||||
pub initrd_path: &'a Path,
|
||||
pub packer: &'a OciPackerService,
|
||||
pub glt: &'a GuestLookupTable,
|
||||
pub runtime: &'a Runtime,
|
||||
}
|
||||
|
||||
impl GuestStarter<'_> {
|
||||
pub async fn oci_spec_tar_read_file(
|
||||
&self,
|
||||
file: &Path,
|
||||
oci: &GuestOciImageSpec,
|
||||
) -> Result<Vec<u8>> {
|
||||
if oci.format() != OciImageFormat::Tar {
|
||||
return Err(anyhow!(
|
||||
"oci image spec for {} is required to be in tar format",
|
||||
oci.digest
|
||||
));
|
||||
}
|
||||
|
||||
let image = self
|
||||
.packer
|
||||
.recall(&oci.digest, OciPackedFormat::Tar)
|
||||
.await?;
|
||||
|
||||
let Some(image) = image else {
|
||||
return Err(anyhow!("image {} was not found in tar format", oci.digest));
|
||||
};
|
||||
|
||||
let mut archive = Archive::new(File::open(&image.path).await?);
|
||||
let mut entries = archive.entries()?;
|
||||
while let Some(entry) = entries.next().await {
|
||||
let mut entry = entry?;
|
||||
let path = entry.path()?;
|
||||
if entry.header().size()? as usize > OCI_SPEC_TAR_FILE_MAX_SIZE {
|
||||
return Err(anyhow!(
|
||||
"file {} in image {} is larger than the size limit",
|
||||
file.to_string_lossy(),
|
||||
oci.digest
|
||||
));
|
||||
}
|
||||
if path == file {
|
||||
let mut buffer = Vec::new();
|
||||
entry.read_to_end(&mut buffer).await?;
|
||||
return Ok(buffer);
|
||||
}
|
||||
}
|
||||
Err(anyhow!(
|
||||
"unable to find file {} in image {}",
|
||||
file.to_string_lossy(),
|
||||
oci.digest
|
||||
))
|
||||
}
|
||||
|
||||
pub async fn start(&self, uuid: Uuid, guest: &mut Guest) -> Result<GuestReconcilerResult> {
|
||||
let Some(ref spec) = guest.spec else {
|
||||
return Err(anyhow!("guest spec not specified"));
|
||||
};
|
||||
|
||||
let Some(ref image) = spec.image else {
|
||||
return Err(anyhow!("image spec not provided"));
|
||||
};
|
||||
let oci = match image.image {
|
||||
Some(Image::Oci(ref oci)) => oci,
|
||||
None => {
|
||||
return Err(anyhow!("oci spec not specified"));
|
||||
}
|
||||
};
|
||||
let task = spec.task.as_ref().cloned().unwrap_or_default();
|
||||
|
||||
let image = self
|
||||
.packer
|
||||
.recall(
|
||||
&oci.digest,
|
||||
match oci.format() {
|
||||
OciImageFormat::Unknown => OciPackedFormat::Squashfs,
|
||||
OciImageFormat::Squashfs => OciPackedFormat::Squashfs,
|
||||
OciImageFormat::Erofs => OciPackedFormat::Erofs,
|
||||
OciImageFormat::Tar => {
|
||||
return Err(anyhow!("tar image format is not supported for guests"));
|
||||
}
|
||||
},
|
||||
)
|
||||
.await?;
|
||||
|
||||
let Some(image) = image else {
|
||||
return Err(anyhow!(
|
||||
"image {} in the requested format did not exist",
|
||||
oci.digest
|
||||
));
|
||||
};
|
||||
|
||||
let kernel = if let Some(ref spec) = spec.kernel {
|
||||
let Some(Image::Oci(ref oci)) = spec.image else {
|
||||
return Err(anyhow!("kernel image spec must be an oci image"));
|
||||
};
|
||||
self.oci_spec_tar_read_file(&PathBuf::from("kernel/image"), oci)
|
||||
.await?
|
||||
} else {
|
||||
fs::read(&self.kernel_path).await?
|
||||
};
|
||||
let initrd = if let Some(ref spec) = spec.initrd {
|
||||
let Some(Image::Oci(ref oci)) = spec.image else {
|
||||
return Err(anyhow!("initrd image spec must be an oci image"));
|
||||
};
|
||||
self.oci_spec_tar_read_file(&PathBuf::from("krata/initrd"), oci)
|
||||
.await?
|
||||
} else {
|
||||
fs::read(&self.initrd_path).await?
|
||||
};
|
||||
|
||||
let info = self
|
||||
.runtime
|
||||
.launch(GuestLaunchRequest {
|
||||
format: LaunchPackedFormat::Squashfs,
|
||||
uuid: Some(uuid),
|
||||
name: if spec.name.is_empty() {
|
||||
None
|
||||
} else {
|
||||
Some(spec.name.clone())
|
||||
},
|
||||
image,
|
||||
kernel,
|
||||
initrd,
|
||||
vcpus: spec.vcpus,
|
||||
mem: spec.mem,
|
||||
env: task
|
||||
.environment
|
||||
.iter()
|
||||
.map(|x| (x.key.clone(), x.value.clone()))
|
||||
.collect::<HashMap<_, _>>(),
|
||||
run: empty_vec_optional(task.command.clone()),
|
||||
debug: false,
|
||||
})
|
||||
.await?;
|
||||
self.glt.associate(uuid, info.domid).await;
|
||||
info!("started guest {}", uuid);
|
||||
guest.state = Some(GuestState {
|
||||
status: GuestStatus::Started.into(),
|
||||
network: Some(guestinfo_to_networkstate(&info)),
|
||||
exit_info: None,
|
||||
error_info: None,
|
||||
host: self.glt.host_uuid().to_string(),
|
||||
domid: info.domid,
|
||||
});
|
||||
Ok(GuestReconcilerResult::Changed { rerun: false })
|
||||
}
|
||||
}
|
||||
|
||||
fn empty_vec_optional<T>(value: Vec<T>) -> Option<Vec<T>> {
|
||||
if value.is_empty() {
|
||||
None
|
||||
} else {
|
||||
Some(value)
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user