nvidia GPU support for caps and multiple uuids

This improves nvidia support for multiple uuids per container and fixes
the API to add individual capabilities.

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

contrib/nvidia/nvidia.go

@@ -86,8 +86,7 @@ func WithGPUs(opts ...Opts) oci.SpecOpts {
 }
 
 type config struct {
-	Devices      []int
+	Devices      []string
-	DeviceUUID   string
 	Capabilities []Capability
 	LoadKmods    bool
 	LDCache      string
@@ -108,10 +107,7 @@ func (c *config) args() []string {
 		"configure",
 	)
 	if len(c.Devices) > 0 {
-		args = append(args, fmt.Sprintf("--device=%s", strings.Join(toStrings(c.Devices), ",")))
+		args = append(args, fmt.Sprintf("--device=%s", strings.Join(c.Devices, ",")))
-	}
-	if c.DeviceUUID != "" {
-		args = append(args, fmt.Sprintf("--device=%s", c.DeviceUUID))
 	}
 	for _, c := range c.Capabilities {
 		args = append(args, fmt.Sprintf("--%s", capFlags[c]))
@@ -135,36 +131,30 @@ var capFlags = map[Capability]string{
 	Display:  "display",
 }
 
-func toStrings(ints []int) []string {
-	var s []string
-	for _, i := range ints {
-		s = append(s, strconv.Itoa(i))
-	}
-	return s
-}
-
 // Opts are options for configuring gpu support
 type Opts func(*config) error
 
 // WithDevices adds the provided device indexes to the container
 func WithDevices(ids ...int) Opts {
 	return func(c *config) error {
-		c.Devices = ids
+		for _, i := range ids {
+			c.Devices = append(c.Devices, strconv.Itoa(i))
+		}
 		return nil
 	}
 }
 
-// WithDeviceUUID adds the specific device UUID to the container
+// WithDeviceUUIDs adds the specific device UUID to the container
-func WithDeviceUUID(guid string) Opts {
+func WithDeviceUUIDs(uuids ...string) Opts {
 	return func(c *config) error {
-		c.DeviceUUID = guid
+		c.Devices = append(c.Devices, uuids...)
 		return nil
 	}
 }
 
 // WithAllDevices adds all gpus to the container
 func WithAllDevices(c *config) error {
-	c.DeviceUUID = "all"
+	c.Devices = []string{"all"}
 	return nil
 }
 
@@ -176,6 +166,14 @@ func WithAllCapabilities(c *config) error {
 	return nil
 }
 
+// WithCapabilities adds the specified capabilities to the container for the gpus
+func WithCapabilities(caps ...Capability) Opts {
+	return func(c *config) error {
+		c.Capabilities = append(c.Capabilities, caps...)
+		return nil
+	}
+}
+
 // WithRequiredCUDAVersion sets the required cuda version
 func WithRequiredCUDAVersion(major, minor int) Opts {
 	return func(c *config) error {