Allow container runtime executable path to be specified

This change adds support for specifying the container runtime
executable path. This can be used if, for example, there are
two containerd or crio executables and a specific one must be used.

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

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

@@ -68,6 +68,7 @@ type config struct {
 	dryRun         bool
 	runtime        string
 	configFilePath string
+	executablePath string
 	configSource   string
 	mode           string
 	hookFilePath   string
@@ -118,6 +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",
@@ -206,6 +212,11 @@ func (m command) validateFlags(c *cli.Context, config *config) error {
 		config.cdi.enabled = false
 	}
 
+	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 {
 	case configSourceCommand:
 		if config.runtime == "docker" {
@@ -323,9 +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
 }