Add os hook for interrupt signal while waiting for service to converge.

pkg/upstream/stack/stack.go

@@ -5,6 +5,8 @@ import (
 	"fmt"
 	"io"
 	"io/ioutil"
+	"os"
+	"os/signal"
 	"strings"
 	"time"
 
@@ -454,6 +456,10 @@ func WaitOnService(ctx context.Context, cl *dockerClient.Client, serviceID, appN
 	errChan := make(chan error, 1)
 	pipeReader, pipeWriter := io.Pipe()
 
+	sigintChannel := make(chan os.Signal, 1)
+	signal.Notify(sigintChannel, os.Interrupt)
+	defer signal.Stop(sigintChannel)
+
 	go func() {
 		errChan <- progress.ServiceProgress(ctx, cl, serviceID, pipeWriter)
 	}()
@@ -465,6 +471,26 @@ func WaitOnService(ctx context.Context, cl *dockerClient.Client, serviceID, appN
 	select {
 	case err := <-errChan:
 		return err
+	case <-sigintChannel:
+		return fmt.Errorf(fmt.Sprintf(`
+The wait for %s to converge was interrupted.
+
+This does not necessarily mean your deployment has stopped, but we aren't 
+monitoring it anymore
+
+You can track latest deployment status with:
+
+    abra app ps --watch %s
+
+And inspect the logs with:
+
+    abra app logs %s
+
+If a service is failing to even start, try to smoke out the error with:
+
+    abra app errors --watch %s
+
+`, appName, appName, appName, appName))
 	case <-time.After(timeout):
 		return fmt.Errorf(fmt.Sprintf(`
 %s has not converged (%s second timeout reached).
@@ -481,7 +507,7 @@ And inspect the logs with:
 
     abra app logs %s
 
-If a service is failing to even start, try smoke out the error with:
+If a service is failing to even start, try to smoke out the error with:
 
     abra app errors --watch %s