Add nvidia-container-config option to overide drivercapabilities

This change adds support for a supported-driver-capabilities config
option in the config.toml file that allows the driver capabilities
associated with the NVIDIA_DRIVER_CAPABILITIES=all environment variable.
This can be used on platforms such as Jetson to remove unsupported
capabilities such as "ngx".

Signed-off-by: Evan Lezar <elezar@nvidia.com>

cmd/nvidia-container-toolkit/capabilities.go

@@ -2,6 +2,15 @@ package main
 
 import (
 	"log"
+	"strings"
+)
+
+const (
+	allDriverCapabilities     = DriverCapabilities("compute,compat32,graphics,utility,video,display,ngx")
+	defaultDriverCapabilities = DriverCapabilities("utility,compute")
+
+	none = DriverCapabilities("")
+	all  = DriverCapabilities("all")
 )
 
 func capabilityToCLI(cap string) string {
@@ -25,3 +34,50 @@ func capabilityToCLI(cap string) string {
 	}
 	return ""
 }
+
+// DriverCapabilities is used to process the NVIDIA_DRIVER_CAPABILITIES environment
+// variable. Operations include default values, filtering, and handling meta values such as "all"
+type DriverCapabilities string
+
+// Intersection returns intersection between two sets of capabilities.
+func (d DriverCapabilities) Intersection(capabilities DriverCapabilities) DriverCapabilities {
+	if capabilities == all {
+		return d
+	}
+	if d == all {
+		return capabilities
+	}
+
+	lookup := make(map[string]bool)
+	for _, c := range d.list() {
+		lookup[c] = true
+	}
+	var found []string
+	for _, c := range capabilities.list() {
+		if lookup[c] {
+			found = append(found, c)
+		}
+	}
+
+	intersection := DriverCapabilities(strings.Join(found, ","))
+	return intersection
+}
+
+// String returns the string representation of the driver capabilities
+func (d DriverCapabilities) String() string {
+	return string(d)
+}
+
+// list returns the driver capabilities as a list
+func (d DriverCapabilities) list() []string {
+	var caps []string
+	for _, c := range strings.Split(string(d), ",") {
+		trimmed := strings.TrimSpace(c)
+		if len(trimmed) == 0 {
+			continue
+		}
+		caps = append(caps, trimmed)
+	}
+
+	return caps
+}

cmd/nvidia-container-toolkit/capabilities_test.go

@@ -0,0 +1,134 @@
+/**
+# Copyright (c) 2021, NVIDIA CORPORATION.  All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+**/
+
+package main
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestDriverCapabilitiesIntersection(t *testing.T) {
+	testCases := []struct {
+		capabilities          DriverCapabilities
+		supportedCapabilities DriverCapabilities
+		expectedIntersection  DriverCapabilities
+	}{
+		{
+			capabilities:          none,
+			supportedCapabilities: none,
+			expectedIntersection:  none,
+		},
+		{
+			capabilities:          all,
+			supportedCapabilities: none,
+			expectedIntersection:  none,
+		},
+		{
+			capabilities:          all,
+			supportedCapabilities: allDriverCapabilities,
+			expectedIntersection:  allDriverCapabilities,
+		},
+		{
+			capabilities:          allDriverCapabilities,
+			supportedCapabilities: all,
+			expectedIntersection:  allDriverCapabilities,
+		},
+		{
+			capabilities:          none,
+			supportedCapabilities: all,
+			expectedIntersection:  none,
+		},
+		{
+			capabilities:          none,
+			supportedCapabilities: DriverCapabilities("cap1"),
+			expectedIntersection:  none,
+		},
+		{
+			capabilities:          DriverCapabilities("cap0,cap1"),
+			supportedCapabilities: DriverCapabilities("cap1,cap0"),
+			expectedIntersection:  DriverCapabilities("cap0,cap1"),
+		},
+		{
+			capabilities:          defaultDriverCapabilities,
+			supportedCapabilities: allDriverCapabilities,
+			expectedIntersection:  defaultDriverCapabilities,
+		},
+		{
+			capabilities:          DriverCapabilities("compute,compat32,graphics,utility,video,display"),
+			supportedCapabilities: DriverCapabilities("compute,compat32,graphics,utility,video,display,ngx"),
+			expectedIntersection:  DriverCapabilities("compute,compat32,graphics,utility,video,display"),
+		},
+		{
+			capabilities:          DriverCapabilities("cap1"),
+			supportedCapabilities: none,
+			expectedIntersection:  none,
+		},
+		{
+			capabilities:          DriverCapabilities("compute,compat32,graphics,utility,video,display,ngx"),
+			supportedCapabilities: DriverCapabilities("compute,compat32,graphics,utility,video,display"),
+			expectedIntersection:  DriverCapabilities("compute,compat32,graphics,utility,video,display"),
+		},
+	}
+
+	for i, tc := range testCases {
+		t.Run(fmt.Sprintf("test case %d", i), func(t *testing.T) {
+			intersection := tc.supportedCapabilities.Intersection(tc.capabilities)
+			require.EqualValues(t, tc.expectedIntersection, intersection)
+		})
+	}
+}
+
+func TestDriverCapabilitiesList(t *testing.T) {
+	testCases := []struct {
+		capabilities DriverCapabilities
+		expected     []string
+	}{
+		{
+			capabilities: DriverCapabilities(""),
+		},
+		{
+			capabilities: DriverCapabilities("  "),
+		},
+		{
+			capabilities: DriverCapabilities(","),
+		},
+		{
+			capabilities: DriverCapabilities(",cap"),
+			expected:     []string{"cap"},
+		},
+		{
+			capabilities: DriverCapabilities("cap,"),
+			expected:     []string{"cap"},
+		},
+		{
+			capabilities: DriverCapabilities("cap0,,cap1"),
+			expected:     []string{"cap0", "cap1"},
+		},
+		{
+			capabilities: DriverCapabilities("cap1,cap0,cap3"),
+			expected:     []string{"cap1", "cap0", "cap3"},
+		},
+	}
+
+	for i, tc := range testCases {
+		t.Run(fmt.Sprintf("test case %d", i), func(t *testing.T) {
+			require.EqualValues(t, tc.expected, tc.capabilities.list())
+		})
+	}
+}

cmd/nvidia-container-toolkit/container_config.go

@@ -26,11 +26,6 @@ const (
 	envNVDriverCapabilities = "NVIDIA_DRIVER_CAPABILITIES"
 )
 
-const (
-	allDriverCapabilities     = "compute,compat32,graphics,utility,video,display,ngx"
-	defaultDriverCapabilities = "utility,compute"
-)
-
 const (
 	capSysAdmin = "CAP_SYS_ADMIN"
 )
@@ -316,33 +311,27 @@ func getMigMonitorDevices(env map[string]string) *string {
 	return nil
 }
 
-func getDriverCapabilities(env map[string]string, legacyImage bool) *string {
+func getDriverCapabilities(env map[string]string, supportedDriverCapabilities DriverCapabilities, legacyImage bool) DriverCapabilities {
-	// Grab a reference to the capabilities from the envvar
+	// We use the default driver capabilities by default. This is filtered to only include the
-	// if it actually exists in the environment.
+	// supported capabilities
-	var capabilities *string
+	capabilities := supportedDriverCapabilities.Intersection(defaultDriverCapabilities)
-	if caps, ok := env[envNVDriverCapabilities]; ok {
+
-		capabilities = &caps
+	capsEnv, capsEnvSpecified := env[envNVDriverCapabilities]
+
+	if !capsEnvSpecified && legacyImage {
+		// Environment variable unset with legacy image: set all capabilities.
+		return supportedDriverCapabilities
 	}
 
-	// Environment variable unset with legacy image: set all capabilities.
+	if capsEnvSpecified && len(capsEnv) > 0 {
-	if capabilities == nil && legacyImage {
+		// If the envvironment variable is specified and is non-empty, use the capabilities value
-		allCaps := allDriverCapabilities
+		envCapabilities := DriverCapabilities(capsEnv)
-		return &allCaps
+		capabilities = supportedDriverCapabilities.Intersection(envCapabilities)
+		if envCapabilities != all && capabilities != envCapabilities {
+			log.Panicln(fmt.Errorf("unsupported capabilities found in '%v' (allowed '%v')", envCapabilities, capabilities))
+		}
 	}
 
-	// Environment variable unset or set but empty: set default capabilities.
-	if capabilities == nil || len(*capabilities) == 0 {
-		defaultCaps := defaultDriverCapabilities
-		return &defaultCaps
-	}
-
-	// Environment variable set to "all": set all capabilities.
-	if *capabilities == "all" {
-		allCaps := allDriverCapabilities
-		return &allCaps
-	}
-
-	// Any other value
 	return capabilities
 }
 
@@ -389,10 +378,7 @@ func getNvidiaConfig(hookConfig *HookConfig, env map[string]string, mounts []Mou
 		log.Panicln("cannot set MIG_MONITOR_DEVICES in non privileged container")
 	}
 
-	var driverCapabilities string
+	driverCapabilities := getDriverCapabilities(env, hookConfig.SupportedDriverCapabilities, legacyImage).String()
-	if c := getDriverCapabilities(env, legacyImage); c != nil {
-		driverCapabilities = *c
-	}
 
 	requirements := getRequirements(env, legacyImage)
 

cmd/nvidia-container-toolkit/container_config_test.go

@@ -12,6 +12,7 @@ func TestGetNvidiaConfig(t *testing.T) {
 		description    string
 		env            map[string]string
 		privileged     bool
+		hookConfig     *HookConfig
 		expectedConfig *nvidiaConfig
 		expectedPanic  bool
 	}{
@@ -35,7 +36,7 @@ func TestGetNvidiaConfig(t *testing.T) {
 			privileged: false,
 			expectedConfig: &nvidiaConfig{
 				Devices:            "all",
-				DriverCapabilities: allDriverCapabilities,
+				DriverCapabilities: allDriverCapabilities.String(),
 				Requirements:       []string{"cuda>=9.0"},
 				DisableRequire:     false,
 			},
@@ -49,7 +50,7 @@ func TestGetNvidiaConfig(t *testing.T) {
 			privileged: false,
 			expectedConfig: &nvidiaConfig{
 				Devices:            "all",
-				DriverCapabilities: allDriverCapabilities,
+				DriverCapabilities: allDriverCapabilities.String(),
 				Requirements:       []string{"cuda>=9.0"},
 				DisableRequire:     false,
 			},
@@ -81,7 +82,7 @@ func TestGetNvidiaConfig(t *testing.T) {
 			privileged: false,
 			expectedConfig: &nvidiaConfig{
 				Devices:            "",
-				DriverCapabilities: allDriverCapabilities,
+				DriverCapabilities: allDriverCapabilities.String(),
 				Requirements:       []string{"cuda>=9.0"},
 				DisableRequire:     false,
 			},
@@ -95,7 +96,7 @@ func TestGetNvidiaConfig(t *testing.T) {
 			privileged: false,
 			expectedConfig: &nvidiaConfig{
 				Devices:            "gpu0,gpu1",
-				DriverCapabilities: allDriverCapabilities,
+				DriverCapabilities: allDriverCapabilities.String(),
 				Requirements:       []string{"cuda>=9.0"},
 				DisableRequire:     false,
 			},
@@ -110,7 +111,7 @@ func TestGetNvidiaConfig(t *testing.T) {
 			privileged: false,
 			expectedConfig: &nvidiaConfig{
 				Devices:            "gpu0,gpu1",
-				DriverCapabilities: defaultDriverCapabilities,
+				DriverCapabilities: defaultDriverCapabilities.String(),
 				Requirements:       []string{"cuda>=9.0"},
 				DisableRequire:     false,
 			},
@@ -125,7 +126,7 @@ func TestGetNvidiaConfig(t *testing.T) {
 			privileged: false,
 			expectedConfig: &nvidiaConfig{
 				Devices:            "gpu0,gpu1",
-				DriverCapabilities: allDriverCapabilities,
+				DriverCapabilities: allDriverCapabilities.String(),
 				Requirements:       []string{"cuda>=9.0"},
 				DisableRequire:     false,
 			},
@@ -135,12 +136,12 @@ func TestGetNvidiaConfig(t *testing.T) {
 			env: map[string]string{
 				envCUDAVersion:          "9.0",
 				envNVVisibleDevices:     "gpu0,gpu1",
-				envNVDriverCapabilities: "cap0,cap1",
+				envNVDriverCapabilities: "video,display",
 			},
 			privileged: false,
 			expectedConfig: &nvidiaConfig{
 				Devices:            "gpu0,gpu1",
-				DriverCapabilities: "cap0,cap1",
+				DriverCapabilities: "video,display",
 				Requirements:       []string{"cuda>=9.0"},
 				DisableRequire:     false,
 			},
@@ -150,14 +151,14 @@ func TestGetNvidiaConfig(t *testing.T) {
 			env: map[string]string{
 				envCUDAVersion:              "9.0",
 				envNVVisibleDevices:         "gpu0,gpu1",
-				envNVDriverCapabilities:     "cap0,cap1",
+				envNVDriverCapabilities:     "video,display",
 				envNVRequirePrefix + "REQ0": "req0=true",
 				envNVRequirePrefix + "REQ1": "req1=false",
 			},
 			privileged: false,
 			expectedConfig: &nvidiaConfig{
 				Devices:            "gpu0,gpu1",
-				DriverCapabilities: "cap0,cap1",
+				DriverCapabilities: "video,display",
 				Requirements:       []string{"cuda>=9.0", "req0=true", "req1=false"},
 				DisableRequire:     false,
 			},
@@ -167,7 +168,7 @@ func TestGetNvidiaConfig(t *testing.T) {
 			env: map[string]string{
 				envCUDAVersion:              "9.0",
 				envNVVisibleDevices:         "gpu0,gpu1",
-				envNVDriverCapabilities:     "cap0,cap1",
+				envNVDriverCapabilities:     "video,display",
 				envNVRequirePrefix + "REQ0": "req0=true",
 				envNVRequirePrefix + "REQ1": "req1=false",
 				envNVDisableRequire:         "true",
@@ -175,7 +176,7 @@ func TestGetNvidiaConfig(t *testing.T) {
 			privileged: false,
 			expectedConfig: &nvidiaConfig{
 				Devices:            "gpu0,gpu1",
-				DriverCapabilities: "cap0,cap1",
+				DriverCapabilities: "video,display",
 				Requirements:       []string{"cuda>=9.0", "req0=true", "req1=false"},
 				DisableRequire:     true,
 			},
@@ -206,7 +207,7 @@ func TestGetNvidiaConfig(t *testing.T) {
 			privileged: false,
 			expectedConfig: &nvidiaConfig{
 				Devices:            "all",
-				DriverCapabilities: defaultDriverCapabilities,
+				DriverCapabilities: defaultDriverCapabilities.String(),
 				Requirements:       []string{"cuda>=9.0"},
 				DisableRequire:     false,
 			},
@@ -238,7 +239,7 @@ func TestGetNvidiaConfig(t *testing.T) {
 			privileged: false,
 			expectedConfig: &nvidiaConfig{
 				Devices:            "",
-				DriverCapabilities: defaultDriverCapabilities,
+				DriverCapabilities: defaultDriverCapabilities.String(),
 				Requirements:       []string{"cuda>=9.0"},
 				DisableRequire:     false,
 			},
@@ -252,7 +253,7 @@ func TestGetNvidiaConfig(t *testing.T) {
 			privileged: false,
 			expectedConfig: &nvidiaConfig{
 				Devices:            "gpu0,gpu1",
-				DriverCapabilities: defaultDriverCapabilities,
+				DriverCapabilities: defaultDriverCapabilities.String(),
 				Requirements:       []string{"cuda>=9.0"},
 				DisableRequire:     false,
 			},
@@ -267,7 +268,7 @@ func TestGetNvidiaConfig(t *testing.T) {
 			privileged: false,
 			expectedConfig: &nvidiaConfig{
 				Devices:            "gpu0,gpu1",
-				DriverCapabilities: defaultDriverCapabilities,
+				DriverCapabilities: defaultDriverCapabilities.String(),
 				Requirements:       []string{"cuda>=9.0"},
 				DisableRequire:     false,
 			},
@@ -282,7 +283,7 @@ func TestGetNvidiaConfig(t *testing.T) {
 			privileged: false,
 			expectedConfig: &nvidiaConfig{
 				Devices:            "gpu0,gpu1",
-				DriverCapabilities: allDriverCapabilities,
+				DriverCapabilities: allDriverCapabilities.String(),
 				Requirements:       []string{"cuda>=9.0"},
 				DisableRequire:     false,
 			},
@@ -292,12 +293,12 @@ func TestGetNvidiaConfig(t *testing.T) {
 			env: map[string]string{
 				envNVRequireCUDA:        "cuda>=9.0",
 				envNVVisibleDevices:     "gpu0,gpu1",
-				envNVDriverCapabilities: "cap0,cap1",
+				envNVDriverCapabilities: "video,display",
 			},
 			privileged: false,
 			expectedConfig: &nvidiaConfig{
 				Devices:            "gpu0,gpu1",
-				DriverCapabilities: "cap0,cap1",
+				DriverCapabilities: "video,display",
 				Requirements:       []string{"cuda>=9.0"},
 				DisableRequire:     false,
 			},
@@ -307,14 +308,14 @@ func TestGetNvidiaConfig(t *testing.T) {
 			env: map[string]string{
 				envNVRequireCUDA:            "cuda>=9.0",
 				envNVVisibleDevices:         "gpu0,gpu1",
-				envNVDriverCapabilities:     "cap0,cap1",
+				envNVDriverCapabilities:     "video,display",
 				envNVRequirePrefix + "REQ0": "req0=true",
 				envNVRequirePrefix + "REQ1": "req1=false",
 			},
 			privileged: false,
 			expectedConfig: &nvidiaConfig{
 				Devices:            "gpu0,gpu1",
-				DriverCapabilities: "cap0,cap1",
+				DriverCapabilities: "video,display",
 				Requirements:       []string{"cuda>=9.0", "req0=true", "req1=false"},
 				DisableRequire:     false,
 			},
@@ -324,7 +325,7 @@ func TestGetNvidiaConfig(t *testing.T) {
 			env: map[string]string{
 				envNVRequireCUDA:            "cuda>=9.0",
 				envNVVisibleDevices:         "gpu0,gpu1",
-				envNVDriverCapabilities:     "cap0,cap1",
+				envNVDriverCapabilities:     "video,display",
 				envNVRequirePrefix + "REQ0": "req0=true",
 				envNVRequirePrefix + "REQ1": "req1=false",
 				envNVDisableRequire:         "true",
@@ -332,7 +333,7 @@ func TestGetNvidiaConfig(t *testing.T) {
 			privileged: false,
 			expectedConfig: &nvidiaConfig{
 				Devices:            "gpu0,gpu1",
-				DriverCapabilities: "cap0,cap1",
+				DriverCapabilities: "video,display",
 				Requirements:       []string{"cuda>=9.0", "req0=true", "req1=false"},
 				DisableRequire:     true,
 			},
@@ -346,7 +347,7 @@ func TestGetNvidiaConfig(t *testing.T) {
 
 			expectedConfig: &nvidiaConfig{
 				Devices:            "all",
-				DriverCapabilities: defaultDriverCapabilities,
+				DriverCapabilities: defaultDriverCapabilities.String(),
 				Requirements:       []string{},
 				DisableRequire:     false,
 			},
@@ -362,7 +363,7 @@ func TestGetNvidiaConfig(t *testing.T) {
 			expectedConfig: &nvidiaConfig{
 				Devices:            "all",
 				MigConfigDevices:   "mig0,mig1",
-				DriverCapabilities: defaultDriverCapabilities,
+				DriverCapabilities: defaultDriverCapabilities.String(),
 				Requirements:       []string{"cuda>=9.0"},
 				DisableRequire:     false,
 			},
@@ -388,7 +389,7 @@ func TestGetNvidiaConfig(t *testing.T) {
 			expectedConfig: &nvidiaConfig{
 				Devices:            "all",
 				MigMonitorDevices:  "mig0,mig1",
-				DriverCapabilities: defaultDriverCapabilities,
+				DriverCapabilities: defaultDriverCapabilities.String(),
 				Requirements:       []string{"cuda>=9.0"},
 				DisableRequire:     false,
 			},
@@ -403,14 +404,62 @@ func TestGetNvidiaConfig(t *testing.T) {
 			privileged:    false,
 			expectedPanic: true,
 		},
+		{
+			description: "Hook config set as driver-capabilities-all",
+			env: map[string]string{
+				envNVVisibleDevices:     "all",
+				envNVDriverCapabilities: "all",
+			},
+			privileged: true,
+			hookConfig: &HookConfig{
+				SupportedDriverCapabilities: "video,display",
+			},
+			expectedConfig: &nvidiaConfig{
+				Devices:            "all",
+				DriverCapabilities: "video,display",
+			},
+		},
+		{
+			description: "Hook config set, envvar sets driver-capabilities",
+			env: map[string]string{
+				envNVVisibleDevices:     "all",
+				envNVDriverCapabilities: "video,display",
+			},
+			privileged: true,
+			hookConfig: &HookConfig{
+				SupportedDriverCapabilities: "video,display,compute,utility",
+			},
+			expectedConfig: &nvidiaConfig{
+				Devices:            "all",
+				DriverCapabilities: "video,display",
+			},
+		},
+		{
+			description: "Hook config set, envvar unset sets default driver-capabilities",
+			env: map[string]string{
+				envNVVisibleDevices: "all",
+			},
+			privileged: true,
+			hookConfig: &HookConfig{
+				SupportedDriverCapabilities: "video,display,utility,compute",
+			},
+			expectedConfig: &nvidiaConfig{
+				Devices:            "all",
+				DriverCapabilities: defaultDriverCapabilities.String(),
+			},
+		},
 	}
 	for _, tc := range tests {
 		t.Run(tc.description, func(t *testing.T) {
 			// Wrap the call to getNvidiaConfig() in a closure.
 			var config *nvidiaConfig
 			getConfig := func() {
-				hookConfig := getDefaultHookConfig()
+				hookConfig := tc.hookConfig
-				config = getNvidiaConfig(&hookConfig, tc.env, nil, tc.privileged)
+				if hookConfig == nil {
+					defaultConfig := getDefaultHookConfig()
+					hookConfig = &defaultConfig
+				}
+				config = getNvidiaConfig(hookConfig, tc.env, nil, tc.privileged)
 			}
 
 			// For any tests that are expected to panic, make sure they do.
@@ -822,3 +871,119 @@ func TestGetDevicesFromEnvvar(t *testing.T) {
 		})
 	}
 }
+
+func TestGetDriverCapabilities(t *testing.T) {
+
+	supportedCapabilities := "compute,utility,display,video"
+
+	testCases := []struct {
+		description           string
+		env                   map[string]string
+		legacyImage           bool
+		supportedCapabilities string
+		expectedPanic         bool
+		expectedCapabilities  string
+	}{
+		{
+			description: "Env is set for legacy image",
+			env: map[string]string{
+				envNVDriverCapabilities: "display,video",
+			},
+			legacyImage:           true,
+			supportedCapabilities: supportedCapabilities,
+			expectedCapabilities:  "display,video",
+		},
+		{
+			description: "Env is all for legacy image",
+			env: map[string]string{
+				envNVDriverCapabilities: "all",
+			},
+			legacyImage:           true,
+			supportedCapabilities: supportedCapabilities,
+			expectedCapabilities:  supportedCapabilities,
+		},
+		{
+			description: "Env is empty for legacy image",
+			env: map[string]string{
+				envNVDriverCapabilities: "",
+			},
+			legacyImage:           true,
+			supportedCapabilities: supportedCapabilities,
+			expectedCapabilities:  defaultDriverCapabilities.String(),
+		},
+		{
+			description:           "Env unset for legacy image is 'all'",
+			env:                   map[string]string{},
+			legacyImage:           true,
+			supportedCapabilities: supportedCapabilities,
+			expectedCapabilities:  supportedCapabilities,
+		},
+		{
+			description: "Env is set for modern image",
+			env: map[string]string{
+				envNVDriverCapabilities: "display,video",
+			},
+			legacyImage:           false,
+			supportedCapabilities: supportedCapabilities,
+			expectedCapabilities:  "display,video",
+		},
+		{
+			description:           "Env unset for modern image is default",
+			env:                   map[string]string{},
+			legacyImage:           false,
+			supportedCapabilities: supportedCapabilities,
+			expectedCapabilities:  defaultDriverCapabilities.String(),
+		},
+		{
+			description: "Env is all for modern image",
+			env: map[string]string{
+				envNVDriverCapabilities: "all",
+			},
+			legacyImage:           false,
+			supportedCapabilities: supportedCapabilities,
+			expectedCapabilities:  supportedCapabilities,
+		},
+		{
+			description: "Env is empty for modern image",
+			env: map[string]string{
+				envNVDriverCapabilities: "",
+			},
+			legacyImage:           false,
+			supportedCapabilities: supportedCapabilities,
+			expectedCapabilities:  defaultDriverCapabilities.String(),
+		},
+		{
+			description: "Invalid capabilities panic",
+			env: map[string]string{
+				envNVDriverCapabilities: "compute,utility",
+			},
+			supportedCapabilities: "not-compute,not-utility",
+			expectedPanic:         true,
+		},
+		{
+			description:           "Default is restricted for modern image",
+			legacyImage:           false,
+			supportedCapabilities: "compute",
+			expectedCapabilities:  "compute",
+		},
+	}
+
+	for _, tc := range testCases {
+		t.Run(tc.description, func(t *testing.T) {
+			var capabilites DriverCapabilities
+
+			getDriverCapabilities := func() {
+				supportedCapabilities := DriverCapabilities(tc.supportedCapabilities)
+				capabilites = getDriverCapabilities(tc.env, supportedCapabilities, tc.legacyImage)
+			}
+
+			if tc.expectedPanic {
+				require.Panics(t, getDriverCapabilities)
+				return
+			}
+
+			getDriverCapabilities()
+			require.EqualValues(t, tc.expectedCapabilities, capabilites)
+		})
+	}
+}

cmd/nvidia-container-toolkit/hook_config.go

@@ -35,10 +35,11 @@ type CLIConfig struct {
 
 // HookConfig : options for the nvidia-container-toolkit.
 type HookConfig struct {
-	DisableRequire                 bool    `toml:"disable-require"`
+	DisableRequire                 bool               `toml:"disable-require"`
-	SwarmResource                  *string `toml:"swarm-resource"`
+	SwarmResource                  *string            `toml:"swarm-resource"`
-	AcceptEnvvarUnprivileged       bool    `toml:"accept-nvidia-visible-devices-envvar-when-unprivileged"`
+	AcceptEnvvarUnprivileged       bool               `toml:"accept-nvidia-visible-devices-envvar-when-unprivileged"`
-	AcceptDeviceListAsVolumeMounts bool    `toml:"accept-nvidia-visible-devices-as-volume-mounts"`
+	AcceptDeviceListAsVolumeMounts bool               `toml:"accept-nvidia-visible-devices-as-volume-mounts"`
+	SupportedDriverCapabilities    DriverCapabilities `toml:"supported-driver-capabilities"`
 
 	NvidiaContainerCLI CLIConfig `toml:"nvidia-container-cli"`
 }
@@ -49,6 +50,7 @@ func getDefaultHookConfig() (config HookConfig) {
 		SwarmResource:                  nil,
 		AcceptEnvvarUnprivileged:       true,
 		AcceptDeviceListAsVolumeMounts: false,
+		SupportedDriverCapabilities:    allDriverCapabilities,
 		NvidiaContainerCLI: CLIConfig{
 			Root:        nil,
 			Path:        nil,
@@ -85,6 +87,15 @@ func getHookConfig() (config HookConfig) {
 		}
 	}
 
+	if config.SupportedDriverCapabilities == all {
+		config.SupportedDriverCapabilities = allDriverCapabilities
+	}
+	// We ensure that the supported-driver-capabilites option is a subset of allDriverCapabilities
+	if intersection := allDriverCapabilities.Intersection(config.SupportedDriverCapabilities); intersection != config.SupportedDriverCapabilities {
+		configName := config.getConfigOption("SupportedDriverCapabilities")
+		log.Panicf("Invalid value for config option '%v'; %v (supported: %v)\n", configName, config.SupportedDriverCapabilities, allDriverCapabilities)
+	}
+
 	return config
 }
 

cmd/nvidia-container-toolkit/hook_config_test.go

@@ -0,0 +1,105 @@
+/**
+# Copyright (c) 2021, NVIDIA CORPORATION.  All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+**/
+
+package main
+
+import (
+	"fmt"
+	"os"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestGetHookConfig(t *testing.T) {
+	testCases := []struct {
+		lines                      []string
+		expectedPanic              bool
+		expectedDriverCapabilities DriverCapabilities
+	}{
+		{
+			expectedDriverCapabilities: allDriverCapabilities,
+		},
+		{
+			lines: []string{
+				"supported-driver-capabilities = \"all\"",
+			},
+			expectedDriverCapabilities: allDriverCapabilities,
+		},
+		{
+			lines: []string{
+				"supported-driver-capabilities = \"compute,utility,not-compute\"",
+			},
+			expectedPanic: true,
+		},
+		{
+			lines:                      []string{},
+			expectedDriverCapabilities: allDriverCapabilities,
+		},
+		{
+			lines: []string{
+				"supported-driver-capabilities = \"\"",
+			},
+			expectedDriverCapabilities: none,
+		},
+		{
+			lines: []string{
+				"supported-driver-capabilities = \"utility,compute\"",
+			},
+			expectedDriverCapabilities: DriverCapabilities("utility,compute"),
+		},
+	}
+
+	for i, tc := range testCases {
+		t.Run(fmt.Sprintf("test case %d", i), func(t *testing.T) {
+			var filename string
+			defer func() {
+				if len(filename) > 0 {
+					os.Remove(filename)
+				}
+				configflag = nil
+			}()
+
+			if tc.lines != nil {
+				configFile, err := os.CreateTemp("", "*.toml")
+				require.NoError(t, err)
+				defer configFile.Close()
+
+				filename = configFile.Name()
+				configflag = &filename
+
+				for _, line := range tc.lines {
+					_, err := configFile.WriteString(fmt.Sprintf("%s\n", line))
+					require.NoError(t, err)
+				}
+			}
+
+			var config HookConfig
+			getHookConfig := func() {
+				config = getHookConfig()
+			}
+
+			if tc.expectedPanic {
+				require.Panics(t, getHookConfig)
+				return
+			}
+
+			getHookConfig()
+
+			require.EqualValues(t, tc.expectedDriverCapabilities, config.SupportedDriverCapabilities)
+		})
+	}
+}

packaging/debian/changelog

@@ -1,5 +1,6 @@
 nvidia-container-toolkit (1.6.0~rc.3-1) experimental; urgency=medium
 
+  * Add supported-driver-capabilities config option to the nvidia-container-toolkit
   * Move OCI and command line checks for runtime to internal oci package
 
  -- NVIDIA CORPORATION <cudatools@nvidia.com>  Mon, 15 Nov 2021 13:02:23 +0100

packaging/rpm/SPECS/nvidia-container-toolkit.spec

@@ -66,6 +66,7 @@ rm -f %{_bindir}/nvidia-container-runtime-hook
 %changelog
 * Mon Nov 15 2021 NVIDIA CORPORATION <cudatools@nvidia.com> 1.6.0-0.1.rc.3
 
+- Add supported-driver-capabilities config option to the nvidia-container-toolkit
 - Move OCI and command line checks for runtime to internal oci package
 
 * Fri Nov 05 2021 NVIDIA CORPORATION <cudatools@nvidia.com> 1.6.0-0.1.rc.2