Add Networks format placeholder to podman ps and pod ps

`podman ps --format {{.Networks}}` will show all connected networks for
this container. For `pod ps` it will show the infra container networks.

Signed-off-by: Paul Holzinger <paul.holzinger@web.de>

cmd/podman/containers/ps.go

@@ -392,6 +392,11 @@ func (l psReporter) Names() string {
 	return l.ListContainer.Names[0]
 }
 
+// Networks returns the container network names in string format
+func (l psReporter) Networks() string {
+	return strings.Join(l.ListContainer.Networks, ",")
+}
+
 // Ports converts from Portmappings to the string form
 // required by ps
 func (l psReporter) Ports() string {

cmd/podman/pods/ps.go

@@ -191,6 +191,11 @@ func (l ListPodReporter) Labels() map[string]string {
 	return l.ListPodsReport.Labels
 }
 
+// Networks returns the infra container network names in string format
+func (l ListPodReporter) Networks() string {
+	return strings.Join(l.ListPodsReport.Networks, ",")
+}
+
 // NumberOfContainers returns an int representation for
 // the number of containers belonging to the pod
 func (l ListPodReporter) NumberOfContainers() int {

docs/source/markdown/podman-pod-ps.1.md

@@ -72,6 +72,8 @@ Valid placeholders for the Go template are listed below:
 | .Cgroup             | Cgroup path of pod                                                                              |
 | .Created            | Creation time of pod                                                                            |
 | .InfraID            | Pod infra container ID                                                                          |
+| .Networks           | Show all networks connected to the infra container                                              |
+
 #### **--sort**
 
 Sort by created, ID, name, status, or number of containers

docs/source/markdown/podman-ps.1.md

@@ -80,6 +80,7 @@ Valid placeholders for the Go template are listed below:
 | .Ports          | Exposed ports                                    |
 | .Size           | Size of container                                |
 | .Names          | Name of container                                |
+| .Networks       | Show all networks connected to the container     |
 | .Labels         | All the labels assigned to the container         |
 | .Mounts         | Volumes mounted in the container                 |
 

pkg/domain/entities/container_ps.go

@@ -43,6 +43,8 @@ type ListContainer struct {
 	// Namespaces the container belongs to.  Requires the
 	// namespace boolean to be true
 	Namespaces ListContainerNamespaces
+	// The network names assigned to the container
+	Networks []string
 	// The process id of the container
 	Pid int
 	// If the container is part of Pod, the Pod ID. Requires the pod

pkg/domain/entities/pods.go

@@ -28,8 +28,10 @@ type ListPodsReport struct {
 	InfraId    string //nolint
 	Name       string
 	Namespace  string
-	Status     string
-	Labels     map[string]string
+	// Network names connected to infra container
+	Networks []string
+	Status   string
+	Labels   map[string]string
 }
 
 type ListPodContainer struct {

pkg/domain/infra/abi/pods.go

@@ -333,6 +333,17 @@ func (ic *ContainerEngine) PodPs(ctx context.Context, options entities.PodPSOpti
 		if err != nil {
 			return nil, err
 		}
+		networks := []string{}
+		if len(infraID) > 0 {
+			infra, err := p.InfraContainer()
+			if err != nil {
+				return nil, err
+			}
+			networks, _, err = infra.Networks()
+			if err != nil {
+				return nil, err
+			}
+		}
 		reports = append(reports, &entities.ListPodsReport{
 			Cgroup:     p.CgroupParent(),
 			Containers: lpcs,
@@ -341,6 +352,7 @@ func (ic *ContainerEngine) PodPs(ctx context.Context, options entities.PodPSOpti
 			InfraId:    infraID,
 			Name:       p.Name(),
 			Namespace:  p.Namespace(),
+			Networks:   networks,
 			Status:     status,
 			Labels:     p.Labels(),
 		})

pkg/ps/ps.go

@@ -178,6 +178,11 @@ func ListContainerBatch(rt *libpod.Runtime, ctr *libpod.Container, opts entities
 		return entities.ListContainer{}, err
 	}
 
+	networks, _, err := ctr.Networks()
+	if err != nil {
+		return entities.ListContainer{}, err
+	}
+
 	ps := entities.ListContainer{
 		AutoRemove: ctr.AutoRemove(),
 		Command:    conConfig.Command,
@@ -192,6 +197,7 @@ func ListContainerBatch(rt *libpod.Runtime, ctr *libpod.Container, opts entities
 		Labels:     conConfig.Labels,
 		Mounts:     ctr.UserVolumes(),
 		Names:      []string{conConfig.Name},
+		Networks:   networks,
 		Pid:        pid,
 		Pod:        conConfig.Pod,
 		Ports:      portMappings,

test/e2e/pod_ps_test.go

@@ -305,6 +305,45 @@ var _ = Describe("Podman ps", func() {
 		Expect(session.OutputToString()).To(Not(ContainSubstring(podWithoutNet)))
 	})
 
+	It("podman pod ps --format networks", func() {
+		session := podmanTest.Podman([]string{"pod", "create"})
+		session.WaitWithDefaultTimeout()
+		Expect(session.ExitCode()).To(BeZero())
+
+		session = podmanTest.Podman([]string{"pod", "ps", "--format", "{{ .Networks }}"})
+		session.WaitWithDefaultTimeout()
+		Expect(session.ExitCode()).To(BeZero())
+		if isRootless() {
+			// rootless container don't have a network by default
+			Expect(session.OutputToString()).To(Equal(""))
+		} else {
+			// default network name is podman
+			Expect(session.OutputToString()).To(Equal("podman"))
+		}
+
+		net1 := stringid.GenerateNonCryptoID()
+		session = podmanTest.Podman([]string{"network", "create", net1})
+		session.WaitWithDefaultTimeout()
+		Expect(session.ExitCode()).To(BeZero())
+		defer podmanTest.removeCNINetwork(net1)
+		net2 := stringid.GenerateNonCryptoID()
+		session = podmanTest.Podman([]string{"network", "create", net2})
+		session.WaitWithDefaultTimeout()
+		Expect(session.ExitCode()).To(BeZero())
+		defer podmanTest.removeCNINetwork(net2)
+
+		session = podmanTest.Podman([]string{"pod", "create", "--network", net1 + "," + net2})
+		session.WaitWithDefaultTimeout()
+		Expect(session.ExitCode()).To(BeZero())
+		pid := session.OutputToString()
+
+		session = podmanTest.Podman([]string{"pod", "ps", "--format", "{{ .Networks }}", "--filter", "id=" + pid})
+		session.WaitWithDefaultTimeout()
+		Expect(session.ExitCode()).To(BeZero())
+		// the output is not deterministic so check both possible orders
+		Expect(session.OutputToString()).To(Or(Equal(net1+","+net2), Equal(net2+","+net1)))
+	})
+
 	It("pod no infra should ps", func() {
 		session := podmanTest.Podman([]string{"pod", "create", "--infra=false"})
 		session.WaitWithDefaultTimeout()

test/e2e/ps_test.go

@@ -749,4 +749,43 @@ var _ = Describe("Podman ps", func() {
 		Expect(session.OutputToString()).To(Not(ContainSubstring(ctrWithoutNet)))
 	})
 
+	It("podman ps --format networks", func() {
+		session := podmanTest.Podman([]string{"create", ALPINE})
+		session.WaitWithDefaultTimeout()
+		Expect(session.ExitCode()).To(BeZero())
+
+		session = podmanTest.Podman([]string{"ps", "--all", "--format", "{{ .Networks }}"})
+		session.WaitWithDefaultTimeout()
+		Expect(session.ExitCode()).To(BeZero())
+		if isRootless() {
+			// rootless container don't have a network by default
+			Expect(session.OutputToString()).To(Equal(""))
+		} else {
+			// default network name is podman
+			Expect(session.OutputToString()).To(Equal("podman"))
+		}
+
+		net1 := stringid.GenerateNonCryptoID()
+		session = podmanTest.Podman([]string{"network", "create", net1})
+		session.WaitWithDefaultTimeout()
+		Expect(session.ExitCode()).To(BeZero())
+		defer podmanTest.removeCNINetwork(net1)
+		net2 := stringid.GenerateNonCryptoID()
+		session = podmanTest.Podman([]string{"network", "create", net2})
+		session.WaitWithDefaultTimeout()
+		Expect(session.ExitCode()).To(BeZero())
+		defer podmanTest.removeCNINetwork(net2)
+
+		session = podmanTest.Podman([]string{"create", "--network", net1 + "," + net2, ALPINE})
+		session.WaitWithDefaultTimeout()
+		Expect(session.ExitCode()).To(BeZero())
+		cid := session.OutputToString()
+
+		session = podmanTest.Podman([]string{"ps", "--all", "--format", "{{ .Networks }}", "--filter", "id=" + cid})
+		session.WaitWithDefaultTimeout()
+		Expect(session.ExitCode()).To(BeZero())
+		// the output is not deterministic so check both possible orders
+		Expect(session.OutputToString()).To(Or(Equal(net1+","+net2), Equal(net2+","+net1)))
+	})
+
 })