Allow container runtime executable path to be specified

cmd/nvidia-ctk-installer/container/container.go

@@ -38,6 +38,11 @@ const (
 type Options struct {
 	Config string
 	Socket string
+	// ExecutablePath specifies the path to the container runtime executable.
+	// This is used to extract the current config, for example.
+	// If a HostRootMount is specified, this path is relative to the host root
+	// mount.
+	ExecutablePath string
 	// EnabledCDI indicates whether CDI should be enabled.
 	EnableCDI     bool
 	RuntimeName   string

cmd/nvidia-ctk-installer/container/runtime/containerd/containerd.go

@@ -173,7 +173,7 @@ func getRuntimeConfig(o *container.Options, co *Options) (engine.Interface, erro
 		containerd.WithPath(o.Config),
 		containerd.WithConfigSource(
 			toml.LoadFirst(
-				containerd.CommandLineSource(o.HostRootMount),
+				containerd.CommandLineSource(o.HostRootMount, o.ExecutablePath),
 				toml.FromFile(o.Config),
 			),
 		),

cmd/nvidia-ctk-installer/container/runtime/crio/crio.go

@@ -202,7 +202,7 @@ func getRuntimeConfig(o *container.Options) (engine.Interface, error) {
 		crio.WithPath(o.Config),
 		crio.WithConfigSource(
 			toml.LoadFirst(
-				crio.CommandLineSource(o.HostRootMount),
+				crio.CommandLineSource(o.HostRootMount, o.ExecutablePath),
 				toml.FromFile(o.Config),
 			),
 		),

cmd/nvidia-ctk-installer/container/runtime/runtime.go

@@ -26,6 +26,7 @@ import (
 	"github.com/NVIDIA/nvidia-container-toolkit/cmd/nvidia-ctk-installer/container/runtime/crio"
 	"github.com/NVIDIA/nvidia-container-toolkit/cmd/nvidia-ctk-installer/container/runtime/docker"
 	"github.com/NVIDIA/nvidia-container-toolkit/cmd/nvidia-ctk-installer/container/toolkit"
+	"github.com/NVIDIA/nvidia-container-toolkit/internal/logger"
 )
 
 const (
@@ -53,6 +54,12 @@ func Flags(opts *Options) []cli.Flag {
 			Destination: &opts.Config,
 			EnvVars:     []string{"RUNTIME_CONFIG", "CONTAINERD_CONFIG", "DOCKER_CONFIG"},
 		},
+		&cli.StringFlag{
+			Name:        "executable-path",
+			Usage:       "The path to the runtime executable. This is used to extract the current config",
+			Destination: &opts.ExecutablePath,
+			EnvVars:     []string{"RUNTIME_EXECUTABLE_PATH"},
+		},
 		&cli.StringFlag{
 			Name:        "socket",
 			Usage:       "Path to the runtime socket file",
@@ -104,15 +111,20 @@ func Flags(opts *Options) []cli.Flag {
 	return flags
 }
 
-// ValidateOptions checks whether the specified options are valid
-func ValidateOptions(c *cli.Context, opts *Options, runtime string, toolkitRoot string, to *toolkit.Options) error {
+// Validate checks whether the specified options are valid
+func (opts *Options) Validate(logger logger.Interface, c *cli.Context, runtime string, toolkitRoot string, to *toolkit.Options) error {
 	// We set this option here to ensure that it is available in future calls.
 	opts.RuntimeDir = toolkitRoot
 
 	if !c.IsSet("enable-cdi-in-runtime") {
 		opts.EnableCDI = to.CDI.Enabled
 	}
 
+	if opts.ExecutablePath != "" && opts.RuntimeName == docker.Name {
+		logger.Warningf("Ignoring executable-path=%q flag for %v", opts.ExecutablePath, opts.RuntimeName)
+		opts.ExecutablePath = ""
+	}
+
 	// Apply the runtime-specific config changes.
 	switch runtime {
 	case containerd.Name:

cmd/nvidia-ctk-installer/main.go

@@ -167,7 +167,7 @@ func (a *app) validateFlags(c *cli.Context, o *options) error {
 	if err := a.toolkit.ValidateOptions(&o.toolkitOptions); err != nil {
 		return err
 	}
-	if err := runtime.ValidateOptions(c, &o.runtimeOptions, o.runtime, o.toolkitRoot(), &o.toolkitOptions); err != nil {
+	if err := o.runtimeOptions.Validate(a.logger, c, o.runtime, o.toolkitRoot(), &o.toolkitOptions); err != nil {
 		return err
 	}
 	return nil

cmd/nvidia-ctk/runtime/configure/configure.go

@@ -68,12 +68,11 @@ type config struct {
 	dryRun         bool
 	runtime        string
 	configFilePath string
+	executablePath string
 	configSource   string
 	mode           string
 	hookFilePath   string
 
-	runtimeConfigOverrideJSON string
-
 	nvidiaRuntime struct {
 		name         string
 		path         string
@@ -120,6 +119,11 @@ func (m command) build() *cli.Command {
 			Usage:       "path to the config file for the target runtime",
 			Destination: &config.configFilePath,
 		},
+		&cli.StringFlag{
+			Name:        "executable-path",
+			Usage:       "The path to the runtime executable. This is used to extract the current config",
+			Destination: &config.executablePath,
+		},
 		&cli.StringFlag{
 			Name:        "config-mode",
 			Usage:       "the config mode for runtimes that support multiple configuration mechanisms",
@@ -208,9 +212,9 @@ func (m command) validateFlags(c *cli.Context, config *config) error {
 		config.cdi.enabled = false
 	}
 
-	if config.runtimeConfigOverrideJSON != "" && config.runtime != "containerd" {
-		m.logger.Warningf("Ignoring runtime-config-override flag for %v", config.runtime)
-		config.runtimeConfigOverrideJSON = ""
+	if config.executablePath != "" && config.runtime == "docker" {
+		m.logger.Warningf("Ignoring executable-path=%q flag for %v", config.executablePath, config.runtime)
+		config.executablePath = ""
 	}
 
 	switch config.configSource {
@@ -330,9 +334,9 @@ func (c *config) resolveConfigSource() (toml.Loader, error) {
 func (c *config) getCommandConfigSource() toml.Loader {
 	switch c.runtime {
 	case "containerd":
-		return containerd.CommandLineSource("")
+		return containerd.CommandLineSource("", c.executablePath)
 	case "crio":
-		return crio.CommandLineSource("")
+		return crio.CommandLineSource("", c.executablePath)
 	}
 	return toml.Empty
 }

pkg/config/engine/containerd/containerd.go

@@ -162,8 +162,11 @@ func (c *Config) GetRuntimeConfig(name string) (engine.RuntimeConfig, error) {
 }
 
 // CommandLineSource returns the CLI-based containerd config loader
-func CommandLineSource(hostRoot string) toml.Loader {
-	return toml.FromCommandLine(chrootIfRequired(hostRoot, "containerd", "config", "dump")...)
+func CommandLineSource(hostRoot string, executablePath string) toml.Loader {
+	if executablePath == "" {
+		executablePath = "containerd"
+	}
+	return toml.FromCommandLine(chrootIfRequired(hostRoot, executablePath, "config", "dump")...)
 }
 
 func chrootIfRequired(hostRoot string, commandLine ...string) []string {

pkg/config/engine/crio/crio.go

@@ -157,9 +157,12 @@ func (c *Config) GetRuntimeConfig(name string) (engine.RuntimeConfig, error) {
 func (c *Config) EnableCDI() {}
 
 // CommandLineSource returns the CLI-based crio config loader
-func CommandLineSource(hostRoot string) toml.Loader {
+func CommandLineSource(hostRoot string, executablePath string) toml.Loader {
+	if executablePath == "" {
+		executablePath = "crio"
+	}
 	return toml.LoadFirst(
-		toml.FromCommandLine(chrootIfRequired(hostRoot, "crio", "status", "config")...),
+		toml.FromCommandLine(chrootIfRequired(hostRoot, executablePath, "status", "config")...),
 		toml.FromCommandLine(chrootIfRequired(hostRoot, "crio-status", "config")...),
 	)
 }