adding support for port ranges on --expose

Closes #1834

Signed-off-by: Srini Brahmaroutu <srbrahma@us.ibm.com>

integration-cli/docker_cli_run_test.go

@@ -13,11 +13,13 @@ import (
 	"reflect"
 	"regexp"
 	"sort"
+	"strconv"
 	"strings"
 	"sync"
 	"testing"
 	"time"
 
+	"github.com/docker/docker/nat"
 	"github.com/docker/docker/pkg/mount"
 	"github.com/docker/docker/pkg/networkfs/resolvconf"
 	"github.com/kr/pty"
@@ -2473,3 +2475,31 @@ func TestRunSlowStdoutConsumer(t *testing.T) {
 
 	logDone("run - slow consumer")
 }
+
+func TestRunAllowPortRangeThroughExpose(t *testing.T) {
+	cmd := exec.Command(dockerBinary, "run", "-d", "--expose", "3000-3003", "-P", "busybox", "top")
+	out, _, err := runCommandWithOutput(cmd)
+	if err != nil {
+		t.Fatal(err)
+	}
+	id := strings.TrimSpace(out)
+	portstr, err := inspectFieldJSON(id, "NetworkSettings.Ports")
+	if err != nil {
+		t.Fatal(err)
+	}
+	var ports nat.PortMap
+	err = unmarshalJSON([]byte(portstr), &ports)
+	for port, binding := range ports {
+		portnum, _ := strconv.Atoi(strings.Split(string(port), "/")[0])
+		if portnum < 3000 || portnum > 3003 {
+			t.Fatalf("Port is out of range ", portnum, binding, out)
+		}
+		if binding == nil || len(binding) != 1 || len(binding[0].HostPort) == 0 {
+			t.Fatal("Port is not mapped for the port "+port, out)
+		}
+	}
+	if err := deleteContainer(id); err != nil {
+		t.Fatal(err)
+	}
+	logDone("run - allow port range through --expose flag")
+}