error when adding container to pod with network information

because a pod's network information is dictated by the infra container at creation, a container cannot be created with network attributes.  this has been difficult for users to understand.  we now return an error when a container is being created inside a pod and passes any of the following attributes:

* static IP (v4 and v6)
* static mac
* ports -p (i.e. -p 8080:80)
* exposed ports (i.e. 222-225)
* publish ports from image -P

Signed-off-by: Brent Baude <bbaude@redhat.com>

libpod/define/errors.go

@@ -157,4 +157,8 @@ var (
 
 	// ErrImageInUse indicates the requested operation failed because the image was in use
 	ErrImageInUse = errors.New("image is being used")
+
+	// ErrNetworkOnPodContainer indicates the user wishes to alter network attributes on a container
+	// in a pod.  This cannot be done as the infra container has all the network information
+	ErrNetworkOnPodContainer = errors.New("network cannot be configured when it is shared with a pod")
 )

pkg/specgen/container_validate.go

@@ -37,6 +37,23 @@ func (s *SpecGenerator) Validate() error {
 		}
 	}
 
+	// Containers being added to a pod cannot have certain network attributes
+	// associated with them because those should be on the infra container.
+	if len(s.Pod) > 0 && s.NetNS.NSMode == FromPod {
+		if s.StaticIP != nil || s.StaticIPv6 != nil {
+			return errors.Wrap(define.ErrNetworkOnPodContainer, "static ip addresses must be defined when the pod is created")
+		}
+		if s.StaticMAC != nil {
+			return errors.Wrap(define.ErrNetworkOnPodContainer, "MAC addresses must be defined when the pod is created")
+		}
+		if len(s.CNINetworks) > 0 {
+			return errors.Wrap(define.ErrNetworkOnPodContainer, "networks must be defined when the pod is created")
+		}
+		if len(s.PortMappings) > 0 || s.PublishExposedPorts {
+			return errors.Wrap(define.ErrNetworkOnPodContainer, "published or exposed ports must be defined when the pod is created")
+		}
+	}
+
 	//
 	// ContainerBasicConfig
 	//

test/e2e/create_test.go

@@ -542,4 +542,61 @@ var _ = Describe("Podman create", func() {
 		Expect(session.ExitCode()).To(Not(Equal(0)))
 		Expect(session.ErrorToString()).To(ContainSubstring("Invalid umask"))
 	})
+
+	It("create container in pod with IP should fail", func() {
+		name := "createwithstaticip"
+		pod := podmanTest.RunTopContainerInPod("", "new:"+name)
+		pod.WaitWithDefaultTimeout()
+		Expect(pod.ExitCode()).To(BeZero())
+
+		session := podmanTest.Podman([]string{"create", "--pod", name, "--ip", "192.168.1.2", ALPINE, "top"})
+		session.WaitWithDefaultTimeout()
+		Expect(session.ExitCode()).ToNot(BeZero())
+	})
+
+	It("create container in pod with mac should fail", func() {
+		name := "createwithstaticmac"
+		pod := podmanTest.RunTopContainerInPod("", "new:"+name)
+		pod.WaitWithDefaultTimeout()
+		Expect(pod.ExitCode()).To(BeZero())
+
+		session := podmanTest.Podman([]string{"create", "--pod", name, "--mac-address", "52:54:00:6d:2f:82", ALPINE, "top"})
+		session.WaitWithDefaultTimeout()
+		Expect(session.ExitCode()).ToNot(BeZero())
+	})
+
+	It("create container in pod with network should fail", func() {
+		name := "createwithnetwork"
+		pod := podmanTest.RunTopContainerInPod("", "new:"+name)
+		pod.WaitWithDefaultTimeout()
+		Expect(pod.ExitCode()).To(BeZero())
+
+		session := podmanTest.Podman([]string{"create", "--pod", name, "--network", "foobar", ALPINE, "top"})
+		session.WaitWithDefaultTimeout()
+		//Expect(session.ExitCode()).ToNot(BeZero())
+		Expect(session.ExitCode()).To(BeZero())
+	})
+
+	It("create container in pod with ports should fail", func() {
+		name := "createwithports"
+		pod := podmanTest.RunTopContainerInPod("", "new:"+name)
+		pod.WaitWithDefaultTimeout()
+		Expect(pod.ExitCode()).To(BeZero())
+
+		session := podmanTest.Podman([]string{"create", "--pod", name, "-p", "80:80", ALPINE, "top"})
+		session.WaitWithDefaultTimeout()
+		Expect(session.ExitCode()).ToNot(BeZero())
+	})
+
+	It("create container in pod ppublish ports should fail", func() {
+		name := "createwithpublishports"
+		pod := podmanTest.RunTopContainerInPod("", "new:"+name)
+		pod.WaitWithDefaultTimeout()
+		Expect(pod.ExitCode()).To(BeZero())
+
+		session := podmanTest.Podman([]string{"create", "--pod", name, "-P", ALPINE, "top"})
+		session.WaitWithDefaultTimeout()
+		Expect(session.ExitCode()).ToNot(BeZero())
+	})
+
 })