add support for "pid" key

solve #610
convert service.pid to Pod.Spec.HostPid
set Pod.Spec.HostPid to true if service.pid ="host", to false otherwise
update conversion.md on support for the key

pkg/kobject/kobject.go

@@ -76,6 +76,7 @@ type ServiceConfig struct {
 	CapAdd          []string            `compose:"cap_add" bundle:""`
 	CapDrop         []string            `compose:"cap_drop" bundle:""`
 	Expose          []string            `compose:"expose" bundle:""`
+	Pid             string              `compose:"pid" bundle:""`
 	Privileged      bool                `compose:"privileged" bundle:""`
 	Restart         string              `compose:"restart" bundle:""`
 	User            string              `compose:"user" bundle:"User"`

pkg/loader/compose/compose.go

@@ -68,7 +68,6 @@ func checkUnsupportedKey(composeProject *project.Project) []string {
 		"MacAddress":    false,
 		"MemSwapLimit":  false,
 		"NetworkMode":   false,
-		"Pid":           false,
 		"SecurityOpt":   false,
 		"ShmSize":       false,
 		"StopSignal":    false,
@@ -368,6 +367,7 @@ func (c *Compose) LoadFile(files []string) (kobject.KomposeObject, error) {
 		serviceConfig.CPUQuota = int64(composeServiceConfig.CPUQuota)
 		serviceConfig.CapAdd = composeServiceConfig.CapAdd
 		serviceConfig.CapDrop = composeServiceConfig.CapDrop
+		serviceConfig.Pid = composeServiceConfig.Pid
 		serviceConfig.Expose = composeServiceConfig.Expose
 		serviceConfig.Privileged = composeServiceConfig.Privileged
 		serviceConfig.Restart = composeServiceConfig.Restart

pkg/transformer/kubernetes/k8sutils.go

@@ -399,6 +399,16 @@ func (k *Kubernetes) UpdateKubernetesObjects(name string, service kobject.Servic
 			template.Spec.Containers[0].Resources.Limits = memoryResourceList
 		}
 
+		podSecurityContext := &api.PodSecurityContext{}
+		//set pid namespace mode
+		if service.Pid != "" {
+			if service.Pid == "host" {
+				podSecurityContext.HostPID = true
+			} else {
+				log.Warningf("Ignoring PID key for service \"%v\". Invalid value \"%v\".", name, service.Pid)
+			}
+		}
+
 		// Setup security context
 		securityContext := &api.SecurityContext{}
 		if service.Privileged == true {
@@ -423,7 +433,9 @@ func (k *Kubernetes) UpdateKubernetesObjects(name string, service kobject.Servic
 		if *securityContext != (api.SecurityContext{}) {
 			template.Spec.Containers[0].SecurityContext = securityContext
 		}
-
+		if !reflect.DeepEqual(*podSecurityContext, api.PodSecurityContext{}) {
+			template.Spec.SecurityContext = podSecurityContext
+		}
 		template.Spec.Containers[0].Ports = ports
 		template.ObjectMeta.Labels = transformer.ConfigLabels(name)
 

pkg/transformer/kubernetes/k8sutils_test.go

@@ -174,6 +174,80 @@ func TestCreateServiceWithServiceUser(t *testing.T) {
 
 }
 
+func TestTransformWithPid(t *testing.T) {
+	// An example service
+	service := kobject.ServiceConfig{
+		ContainerName: "name",
+		Image:         "image",
+		Environment:   []kobject.EnvVar{kobject.EnvVar{Name: "env", Value: "value"}},
+		Port:          []kobject.Ports{kobject.Ports{HostPort: 123, ContainerPort: 456, Protocol: api.ProtocolTCP}},
+		Command:       []string{"cmd"},
+		WorkingDir:    "dir",
+		Args:          []string{"arg1", "arg2"},
+		Volumes:       []string{"/tmp/volume"},
+		Network:       []string{"network1", "network2"},
+		Restart:       "always",
+		Pid:           "host",
+	}
+
+	// An example object generated via k8s runtime.Objects()
+	komposeObject := kobject.KomposeObject{
+		ServiceConfigs: map[string]kobject.ServiceConfig{"app": service},
+	}
+	k := Kubernetes{}
+	objects, err := k.Transform(komposeObject, kobject.ConvertOptions{CreateD: true, Replicas: 3})
+	if err != nil {
+		t.Error(errors.Wrap(err, "k.Transform failed"))
+	}
+
+	for _, obj := range objects {
+		if deploy, ok := obj.(*extensions.Deployment); ok {
+			hostPid := deploy.Spec.Template.Spec.SecurityContext.HostPID
+			if hostPid != true {
+				t.Errorf("Pid in ServiceConfig is not matching HostPID in PodSpec")
+			}
+		}
+	}
+}
+
+func TestTransformWithInvaildPid(t *testing.T) {
+	// An example service
+	service := kobject.ServiceConfig{
+		ContainerName: "name",
+		Image:         "image",
+		Environment:   []kobject.EnvVar{kobject.EnvVar{Name: "env", Value: "value"}},
+		Port:          []kobject.Ports{kobject.Ports{HostPort: 123, ContainerPort: 456, Protocol: api.ProtocolTCP}},
+		Command:       []string{"cmd"},
+		WorkingDir:    "dir",
+		Args:          []string{"arg1", "arg2"},
+		Volumes:       []string{"/tmp/volume"},
+		Network:       []string{"network1", "network2"},
+		Restart:       "always",
+		Pid:           "badvalue",
+	}
+
+	// An example object generated via k8s runtime.Objects()
+	komposeObject := kobject.KomposeObject{
+		ServiceConfigs: map[string]kobject.ServiceConfig{"app": service},
+	}
+	k := Kubernetes{}
+	objects, err := k.Transform(komposeObject, kobject.ConvertOptions{CreateD: true, Replicas: 3})
+	if err != nil {
+		t.Error(errors.Wrap(err, "k.Transform failed"))
+	}
+
+	for _, obj := range objects {
+		if deploy, ok := obj.(*extensions.Deployment); ok {
+			if deploy.Spec.Template.Spec.SecurityContext != nil {
+				hostPid := deploy.Spec.Template.Spec.SecurityContext.HostPID
+				if hostPid != false {
+					t.Errorf("Pid in ServiceConfig is not matching HostPID in PodSpec")
+				}
+			}
+		}
+	}
+}
+
 func TestIsDir(t *testing.T) {
 	tempPath := "/tmp/kompose_unit"
 	tempDir := filepath.Join(tempPath, "i_am_dir")