@@ -211,6 +211,16 @@ func inspectField(name, field string) (string, error) {

 	return strings.TrimSpace(out), nil

 }

+func inspectFieldJSON(name, field string) (string, error) {

+	format := fmt.Sprintf("{{json .%s}}", field)

+	inspectCmd := exec.Command(dockerBinary, "inspect", "-f", format, name)

+	out, exitCode, err := runCommandWithOutput(inspectCmd)

+	if err != nil || exitCode != 0 {

+		return "", fmt.Errorf("failed to inspect %s: %s", name, out)

+	}

+	return strings.TrimSpace(out), nil

+}

+

 func getIDByName(name string) (string, error) {

 	return inspectField(name, "Id")

 }

@@ -2,9 +2,11 @@ package main

 import (

 	"bytes"

+	"encoding/json"

 	"fmt"

 	"io"

 	"os/exec"

+	"reflect"

 	"strings"

 	"syscall"

 	"testing"

@@ -111,3 +113,24 @@ func errorOutOnNonNilError(err error, t *testing.T, message string) {

 func nLines(s string) int {

 	return strings.Count(s, "\n")

 }

+

+func unmarshalJSON(data []byte, result interface{}) error {

+	err := json.Unmarshal(data, result)

+	if err != nil {

+		return err

+	}

+

+	return nil

+}

+

+func deepEqual(expected interface{}, result interface{}) bool {

+	return reflect.DeepEqual(result, expected)

+}

+

+func convertSliceOfStringsToMap(input []string) map[string]struct{} {

+	output := make(map[string]struct{})

+	for _, v := range input {

+		output[v] = struct{}{}

+	}

+	return output

+}