Use net.JoinHostPort() to fix formatting with IPv6 addresses

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

cli/command/container/port.go

@@ -3,6 +3,7 @@ package container
 import (
 	"context"
 	"fmt"
+	"net"
 	"strings"
 
 	"github.com/docker/cli/cli"
@@ -61,7 +62,7 @@ func runPort(dockerCli command.Cli, opts *portOptions) error {
 		}
 		if frontends, exists := c.NetworkSettings.Ports[newP]; exists && frontends != nil {
 			for _, frontend := range frontends {
-				fmt.Fprintf(dockerCli.Out(), "%s:%s\n", frontend.HostIP, frontend.HostPort)
+				fmt.Fprintln(dockerCli.Out(), net.JoinHostPort(frontend.HostIP, frontend.HostPort))
 			}
 			return nil
 		}
@@ -70,7 +71,7 @@ func runPort(dockerCli command.Cli, opts *portOptions) error {
 
 	for from, frontends := range c.NetworkSettings.Ports {
 		for _, frontend := range frontends {
-			fmt.Fprintf(dockerCli.Out(), "%s -> %s:%s\n", from, frontend.HostIP, frontend.HostPort)
+			fmt.Fprintf(dockerCli.Out(), "%s -> %s\n", from, net.JoinHostPort(frontend.HostIP, frontend.HostPort))
 		}
 	}
 

cli/command/container/port_test.go

@@ -0,0 +1,57 @@
+package container
+
+import (
+	"io/ioutil"
+	"testing"
+
+	"github.com/docker/cli/internal/test"
+	"github.com/docker/docker/api/types"
+	"github.com/docker/go-connections/nat"
+	"gotest.tools/v3/assert"
+	"gotest.tools/v3/golden"
+)
+
+func TestNewPortCommandOutput(t *testing.T) {
+	testCases := []struct {
+		name string
+		ips  []string
+	}{
+		{
+			name: "container-port-ipv4",
+			ips:  []string{"0.0.0.0"},
+		},
+		{
+			name: "container-port-ipv6",
+			ips:  []string{"::"},
+		},
+		{
+			name: "container-port-ipv6-and-ipv4",
+			ips:  []string{"::", "0.0.0.0"},
+		},
+	}
+	for _, tc := range testCases {
+		tc := tc
+		t.Run(tc.name, func(t *testing.T) {
+			cli := test.NewFakeCli(&fakeClient{
+				inspectFunc: func(string) (types.ContainerJSON, error) {
+					ci := types.ContainerJSON{NetworkSettings: &types.NetworkSettings{}}
+					ci.NetworkSettings.Ports = nat.PortMap{
+						"80/tcp": make([]nat.PortBinding, len(tc.ips)),
+					}
+					for i, ip := range tc.ips {
+						ci.NetworkSettings.Ports["80/tcp"][i] = nat.PortBinding{
+							HostIP: ip, HostPort: "3456",
+						}
+					}
+					return ci, nil
+				},
+			}, test.EnableContentTrust)
+			cmd := NewPortCommand(cli)
+			cmd.SetErr(ioutil.Discard)
+			cmd.SetArgs([]string{"some_container", "80"})
+			err := cmd.Execute()
+			assert.NilError(t, err)
+			golden.Assert(t, cli.OutBuffer().String(), tc.name+".golden")
+		})
+	}
+}

cli/command/container/testdata/container-port-ipv4.golden

@@ -0,0 +1 @@
+0.0.0.0:3456

cli/command/container/testdata/container-port-ipv6-and-ipv4.golden

@@ -0,0 +1,2 @@
+[::]:3456
+0.0.0.0:3456

cli/command/container/testdata/container-port-ipv6.golden

@@ -0,0 +1 @@
+[::]:3456

opts/port.go

@@ -3,6 +3,7 @@ package opts
 import (
 	"encoding/csv"
 	"fmt"
+	"net"
 	"regexp"
 	"strconv"
 	"strings"
@@ -148,8 +149,8 @@ func ConvertPortToPortConfig(
 	ports := []swarm.PortConfig{}
 
 	for _, binding := range portBindings[port] {
-		if binding.HostIP != "" && binding.HostIP != "0.0.0.0" {
+		if p := net.ParseIP(binding.HostIP); p != nil && !p.IsUnspecified() {
-			logrus.Warnf("ignoring IP-address (%s:%s:%s) service will listen on '0.0.0.0'", binding.HostIP, binding.HostPort, port)
+			logrus.Warnf("ignoring IP-address (%s:%s) service will listen on '0.0.0.0'", net.JoinHostPort(binding.HostIP, binding.HostPort), port)
 		}
 
 		startHostPort, endHostPort, err := nat.ParsePortRange(binding.HostPort)

opts/port_test.go

@@ -1,9 +1,13 @@
 package opts
 
 import (
+	"bytes"
+	"os"
 	"testing"
 
 	"github.com/docker/docker/api/types/swarm"
+	"github.com/docker/go-connections/nat"
+	"github.com/sirupsen/logrus"
 	"gotest.tools/v3/assert"
 	is "gotest.tools/v3/assert/cmp"
 )
@@ -316,6 +320,46 @@ func TestPortOptInvalidSimpleSyntax(t *testing.T) {
 	}
 }
 
+func TestConvertPortToPortConfigWithIP(t *testing.T) {
+	testCases := []struct {
+		value           string
+		expectedWarning string
+	}{
+		{
+			value: "0.0.0.0",
+		},
+		{
+			value: "::",
+		},
+		{
+			value:           "192.168.1.5",
+			expectedWarning: `ignoring IP-address (192.168.1.5:2345:80/tcp) service will listen on '0.0.0.0'`,
+		},
+		{
+			value:           "::2",
+			expectedWarning: `ignoring IP-address ([::2]:2345:80/tcp) service will listen on '0.0.0.0'`,
+		},
+	}
+
+	var b bytes.Buffer
+	logrus.SetOutput(&b)
+	for _, tc := range testCases {
+		tc := tc
+		t.Run(tc.value, func(t *testing.T) {
+			_, err := ConvertPortToPortConfig("80/tcp", map[nat.Port][]nat.PortBinding{
+				"80/tcp": {{HostIP: tc.value, HostPort: "2345"}},
+			})
+			assert.NilError(t, err)
+			if tc.expectedWarning == "" {
+				assert.Equal(t, b.String(), "")
+			} else {
+				assert.Assert(t, is.Contains(b.String(), tc.expectedWarning))
+			}
+		})
+	}
+	logrus.SetOutput(os.Stderr)
+}
+
 func assertContains(t *testing.T, portConfigs []swarm.PortConfig, expected swarm.PortConfig) {
 	var contains = false
 	for _, portConfig := range portConfigs {