build: fix issues with leaving invoke containers running

Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>

build/build.go

@@ -643,7 +643,16 @@ func Invoke(ctx context.Context, cfg ContainerConfig) error {
 		return errors.Errorf("result must be provided")
 	}
 	c, res := cfg.ResultCtx.Client, cfg.ResultCtx.Res
-	_, err := c.Build(ctx, client.SolveOpt{}, "buildx", func(ctx context.Context, c gateway.Client) (*gateway.Result, error) {
+
+	mainCtx := ctx
+
+	_, err := c.Build(context.TODO(), client.SolveOpt{}, "buildx", func(ctx context.Context, c gateway.Client) (*gateway.Result, error) {
+		ctx, cancel := context.WithCancel(ctx)
+		go func() {
+			<-mainCtx.Done()
+			cancel()
+		}()
+
 		if res.Ref == nil {
 			return nil, errors.Errorf("no reference is registered")
 		}
@@ -673,7 +682,8 @@ func Invoke(ctx context.Context, cfg ContainerConfig) error {
 		if err != nil {
 			return nil, err
 		}
-		defer ctr.Release(ctx)
+		defer ctr.Release(context.TODO())
+
 		proc, err := ctr.Start(ctx, gateway.StartRequest{
 			Args:   cfg.Args,
 			Env:    cfg.Env,

monitor/monitor.go

@@ -52,10 +52,8 @@ func RunMonitor(ctx context.Context, containerConfig build.ContainerConfig, relo
 	}
 
 	// Start container automatically
-	go func() {
 	fmt.Fprintf(stdout, "Launching interactive container. Press Ctrl-a-c to switch to monitor console\n")
 	m.rollback(ctx, containerConfig)
-	}()
 
 	// Serve monitor commands
 	monitorForwarder := newIOForwarder(monitorIn)
@@ -67,6 +65,10 @@ func RunMonitor(ctx context.Context, containerConfig build.ContainerConfig, relo
 		go func() {
 			defer close(doneCh)
 			defer in.Close()
+			go func() {
+				<-ctx.Done()
+				in.Close()
+			}()
 			t := term.NewTerminal(readWriter{in.stdin, in.stdout}, "(buildx) ")
 			for {
 				l, err := t.ReadLine()
@@ -105,8 +107,14 @@ func RunMonitor(ctx context.Context, containerConfig build.ContainerConfig, relo
 		}()
 		select {
 		case <-doneCh:
+			if m.curInvokeCancel != nil {
+				m.curInvokeCancel()
+			}
 			return nil
 		case err := <-errCh:
+			if m.curInvokeCancel != nil {
+				m.curInvokeCancel()
+			}
 			return err
 		case <-monitorDisableCh:
 		}