test: Add a test for container access with 127.0.0.2 specified in -p in rootless mode

When running a rootless container, specifying an address such as 127.0.0.2
for the -p option, we will not be able to access the published container
through that address.

This behavior is reported in the following issue:

- #3539

This behavior is caused by the behavior in rootlesskit, and the following
pull request has been made to improve the behavior.

- rootless-containers/rootlesskit#477

Therefore, this commit adds a test to ensure that the behavior of the
issue has been improved.

Signed-off-by: Hayato Kiwata <[email protected]>

Author: haytok

cmd/nerdctl/container/container_run_linux_test.go

@@ -567,3 +567,42 @@ func TestIssue3568(t *testing.T) {
 
 	testCase.Run(t)
 }
+
+// TestPortBindingWithCustomHost tests https://github.com/containerd/nerdctl/issues/3539
+func TestPortBindingWithCustomHost(t *testing.T) {
+	testCase := nerdtest.Setup()
+
+	const (
+		host     = "127.0.0.2"
+		hostPort = 8080
+	)
+	address := fmt.Sprintf("%s:%d", host, hostPort)
+
+	testCase.SubTests = []*test.Case{
+		{
+			Description: "Issue #3539 - Access to a container running when 127.0.0.2 is specified in -p in rootless mode.",
+			Setup: func(data test.Data, helpers test.Helpers) {
+				helpers.Ensure("run", "-d", "--name", data.Identifier(), "-p", fmt.Sprintf("%s:80", address), testutil.NginxAlpineImage)
+			},
+			Command: func(data test.Data, helpers test.Helpers) test.TestableCommand {
+				return helpers.Custom("curl", "-s", address)
+			},
+			Cleanup: func(data test.Data, helpers test.Helpers) {
+				helpers.Anyhow("rm", "-f", data.Identifier())
+			},
+			Expected: func(data test.Data, helpers test.Helpers) *test.Expected {
+				return &test.Expected{
+					ExitCode: 0,
+					Errors:   []error{},
+					Output: test.All(
+						func(stdout string, info string, t *testing.T) {
+							assert.Assert(t, strings.Contains(string(stdout), testutil.NginxAlpineIndexHTMLSnippet))
+						},
+					),
+				}
+			},
+		},
+	}
+
+	testCase.Run(t)
+}