Pod Device Support

added support for pod devices. The device gets added to the infra container and
recreated in all containers that join the pod.

This required a new container config item to keep track of the original device passed in by the user before
the path was parsed into the container device.

Signed-off-by: cdoern <cdoern@redhat.com>

5 files changed, 32 insertions, 10 deletions

diff --git a/pkg/specgen/generate/config_linux.go b/pkg/specgen/generate/config_linux.go
index 6b9e9c4bf..2d1e2b288 100644
--- a/pkg/specgen/generate/config_linux.go
+++ b/pkg/specgen/generate/config_linux.go
@@ -132,7 +132,6 @@ func DevicesFromPath(g *generate.Generator, devicePath string) error {
 		}
 		return nil
 	}
-
 	return addDevice(g, strings.Join(append([]string{resolvedDevicePath}, devs[1:]...), ":"))
 }
 
diff --git a/pkg/specgen/generate/container_create.go b/pkg/specgen/generate/container_create.go
index 91230338e..fefa9b4a9 100644
--- a/pkg/specgen/generate/container_create.go
+++ b/pkg/specgen/generate/container_create.go
@@ -30,24 +30,27 @@ func MakeContainer(ctx context.Context, rt *libpod.Runtime, s *specgen.SpecGener
 
 	// If joining a pod, retrieve the pod for use, and its infra container
 	var pod *libpod.Pod
-	var cont *libpod.Container
-	var config *libpod.ContainerConfig
+	var infraConfig *libpod.ContainerConfig
 	if s.Pod != "" {
 		pod, err = rt.LookupPod(s.Pod)
 		if err != nil {
 			return nil, nil, nil, errors.Wrapf(err, "error retrieving pod %s", s.Pod)
 		}
 		if pod.HasInfraContainer() {
-			cont, err = pod.InfraContainer()
+			infra, err := pod.InfraContainer()
 			if err != nil {
 				return nil, nil, nil, err
 			}
-			config = cont.Config()
+			infraConfig = infra.Config()
 		}
 	}
 
-	if config != nil && (len(config.NamedVolumes) > 0 || len(config.UserVolumes) > 0 || len(config.ImageVolumes) > 0 || len(config.OverlayVolumes) > 0) {
-		s.VolumesFrom = append(s.VolumesFrom, config.ID)
+	if infraConfig != nil && (len(infraConfig.NamedVolumes) > 0 || len(infraConfig.UserVolumes) > 0 || len(infraConfig.ImageVolumes) > 0 || len(infraConfig.OverlayVolumes) > 0) {
+		s.VolumesFrom = append(s.VolumesFrom, infraConfig.ID)
+	}
+
+	if infraConfig != nil && len(infraConfig.Spec.Linux.Devices) > 0 {
+		s.DevicesFrom = append(s.DevicesFrom, infraConfig.ID)
 	}
 	// Set defaults for unset namespaces
 	if s.PidNS.IsDefault() {
@@ -166,6 +169,16 @@ func MakeContainer(ctx context.Context, rt *libpod.Runtime, s *specgen.SpecGener
 		logrus.Debugf("setting container name %s", s.Name)
 		options = append(options, libpod.WithName(s.Name))
 	}
+	if len(s.DevicesFrom) > 0 {
+		for _, dev := range s.DevicesFrom {
+			ctr, err := rt.GetContainer(dev)
+			if err != nil {
+				return nil, nil, nil, err
+			}
+			devices := ctr.DeviceHostSrc()
+			s.Devices = append(s.Devices, devices...)
+		}
+	}
 	if len(s.Devices) > 0 {
 		opts = extractCDIDevices(s)
 		options = append(options, opts...)
@@ -174,6 +187,9 @@ func MakeContainer(ctx context.Context, rt *libpod.Runtime, s *specgen.SpecGener
 	if err != nil {
 		return nil, nil, nil, err
 	}
+	if len(s.HostDeviceList) > 0 {
+		options = append(options, libpod.WithHostDevice(s.HostDeviceList))
+	}
 	return runtimeSpec, s, options, err
 }
 func ExecuteCreate(ctx context.Context, rt *libpod.Runtime, runtimeSpec *spec.Spec, s *specgen.SpecGenerator, infra bool, options ...libpod.CtrCreateOption) (*libpod.Container, error) {
diff --git a/pkg/specgen/generate/oci.go b/pkg/specgen/generate/oci.go
index 80c7f112f..55010f716 100644
--- a/pkg/specgen/generate/oci.go
+++ b/pkg/specgen/generate/oci.go
@@ -301,8 +301,8 @@ func SpecGenToOCI(ctx context.Context, s *specgen.SpecGenerator, rt *libpod.Runt
 	g.AddProcessEnv("container", "podman")
 
 	g.Config.Linux.Resources = s.ResourceLimits
-
 	// Devices
+
 	if s.Privileged {
 		// If privileged, we need to add all the host devices to the
 		// spec.  We do not add the user provided ones because we are
@@ -313,17 +313,18 @@ func SpecGenToOCI(ctx context.Context, s *specgen.SpecGenerator, rt *libpod.Runt
 	} else {
 		// add default devices from containers.conf
 		for _, device := range rtc.Containers.Devices {
-			if err := DevicesFromPath(&g, device); err != nil {
+			if err = DevicesFromPath(&g, device); err != nil {
 				return nil, err
 			}
 		}
 		// add default devices specified by caller
 		for _, device := range s.Devices {
-			if err := DevicesFromPath(&g, device.Path); err != nil {
+			if err = DevicesFromPath(&g, device.Path); err != nil {
 				return nil, err
 			}
 		}
 	}
+	s.HostDeviceList = s.Devices
 
 	for _, dev := range s.DeviceCGroupRule {
 		g.AddLinuxResourcesDevice(true, dev.Type, dev.Major, dev.Minor, dev.Access)
diff --git a/pkg/specgen/podspecgen.go b/pkg/specgen/podspecgen.go
index 5f72fc47d..83fa9426c 100644
--- a/pkg/specgen/podspecgen.go
+++ b/pkg/specgen/podspecgen.go
@@ -88,6 +88,8 @@ type PodBasicConfig struct {
 	// Image volumes bind-mount a container-image mount into the pod's infra container.
 	// Optional.
 	ImageVolumes []*ImageVolume `json:"image_volumes,omitempty"`
+	// Devices contains user specified Devices to be added to the Pod
+	Devices []string `json:"pod_devices,omitempty"`
 }
 
 // PodNetworkConfig contains networking configuration for a pod.
diff --git a/pkg/specgen/specgen.go b/pkg/specgen/specgen.go
index e0609c5bc..7aa27487a 100644
--- a/pkg/specgen/specgen.go
+++ b/pkg/specgen/specgen.go
@@ -254,6 +254,10 @@ type ContainerStorageConfig struct {
 	// DeviceCGroupRule are device cgroup rules that allow containers
 	// to use additional types of devices.
 	DeviceCGroupRule []spec.LinuxDeviceCgroup `json:"device_cgroup_rule,omitempty"`
+	// DevicesFrom is a way to ensure your container inherits device specific information from another container
+	DevicesFrom []string `json:"devices_from,omitempty"`
+	// HostDeviceList is used to recreate the mounted device on inherited containers
+	HostDeviceList []spec.LinuxDevice `json:"host_device_list,omitempty"`
 	// IpcNS is the container's IPC namespace.
 	// Default is private.
 	// Conflicts with ShmSize if not set to private.