Show isogen container logs if debug is enabled

Change-Id: I92c82eecdb35de22cc4da2326632b8af3aadd4cd

pkg/container/container_docker.go

@@ -225,8 +225,7 @@ func (c *DockerContainer) RunCommand(
 	containerInput io.Reader,
 	volumeMounts []string,
 	envVars []string,
-	// TODO (D. Ukov) add debug logic
+	debug bool,
-	_ bool,
 ) error {
 	realCmd, err := c.getCmd(cmd)
 	if err != nil {
@@ -264,7 +263,24 @@ func (c *DockerContainer) RunCommand(
 		return err
 	}
 
+	if debug {
+		log.Debug("start reading container logs")
+		var reader io.ReadCloser
+		reader, err = c.dockerClient.ContainerLogs(*c.ctx, c.id, types.ContainerLogsOptions{ShowStdout: true, Follow: true})
+		if err != nil {
+			log.Debugf("failed to read container logs %s", err)
+			reader = ioutil.NopCloser(strings.NewReader(""))
+		}
+
+		_, err = io.Copy(log.Writer(), reader)
+		if err != nil {
+			log.Debugf("failed to write container logs to log output %s", err)
+		}
+		log.Debug("got EOF from container logs")
+	}
+
 	statusCh, errCh := c.dockerClient.ContainerWait(*c.ctx, c.id, container.WaitConditionNotRunning)
+	log.Debugf("waiting until command '%s' is finished...", realCmd)
 	select {
 	case err = <-errCh:
 		if err != nil {

pkg/container/container_docker_test.go

@@ -352,7 +352,7 @@ func TestRunCommand(t *testing.T) {
 			cmd:            []string{"testCmd"},
 			containerInput: nil,
 			volumeMounts:   nil,
-			debug:          false,
+			debug:          true,
 			mockDockerClient: mockDockerClient{
 				containerWait: func() (<-chan container.ContainerWaitOKBody, <-chan error) {
 					resC := make(chan container.ContainerWaitOKBody)
@@ -365,6 +365,26 @@ func TestRunCommand(t *testing.T) {
 			expectedErr: ErrRunContainerCommand{Cmd: "docker logs testID"},
 			assertF:     func(t *testing.T) {},
 		},
+		{
+			cmd:            []string{"testCmd"},
+			containerInput: nil,
+			volumeMounts:   nil,
+			debug:          true,
+			mockDockerClient: mockDockerClient{
+				containerWait: func() (<-chan container.ContainerWaitOKBody, <-chan error) {
+					resC := make(chan container.ContainerWaitOKBody)
+					go func() {
+						resC <- container.ContainerWaitOKBody{StatusCode: 1}
+					}()
+					return resC, nil
+				},
+				containerLogs: func() (io.ReadCloser, error) {
+					return nil, fmt.Errorf("Logs error")
+				},
+			},
+			expectedErr: ErrRunContainerCommand{Cmd: "docker logs testID"},
+			assertF:     func(t *testing.T) {},
+		},
 	}
 	for _, tt := range tests {
 		cnt := getDockerContainerMock(tt.mockDockerClient)

pkg/log/log.go

@@ -50,3 +50,8 @@ func Fatal(v ...interface{}) {
 func Fatalf(format string, v ...interface{}) {
 	airshipLog.Fatalf(format, v...)
 }
+
+// Writer returns log output writer object
+func Writer() io.Writer {
+	return airshipLog.Writer()
+}