Add Version() function to the Manager interface

Helps with troubleshooting container runtimes

pkg/minikube/cruntime/containerd.go

@@ -18,6 +18,7 @@ package cruntime
 
 import (
 	"fmt"
+	"strings"
 
 	"github.com/golang/glog"
 )
@@ -33,6 +34,21 @@ func (r *Containerd) Name() string {
 	return "containerd"
 }
 
+// Version retrieves the current version of this runtime
+func (r *Containerd) Version() string {
+	ver, err := r.Runner.CombinedOutput("containerd --version")
+	if err != nil {
+		return ""
+	}
+
+	// containerd github.com/containerd/containerd v1.2.0 c4446665cb9c30056f4998ed953e6d4ff22c7c39
+	words := strings.Split(ver, " ")
+	if len(words) >= 4 && words[0] == "containerd" {
+		return strings.Replace(words[2], "v", "", 1)
+	}
+	return ""
+}
+
 // SocketPath returns the path to the socket file for containerd
 func (r *Containerd) SocketPath() string {
 	if r.Socket != "" {

pkg/minikube/cruntime/crio.go

@@ -18,6 +18,7 @@ package cruntime
 
 import (
 	"fmt"
+	"strings"
 
 	"github.com/golang/glog"
 )
@@ -33,6 +34,19 @@ func (r *CRIO) Name() string {
 	return "CRI-O"
 }
 
+// Version retrieves the current version of this runtime
+func (r *CRIO) Version() string {
+	ver, err := r.Runner.CombinedOutput("crio --version")
+	if err != nil {
+		return ""
+	}
+
+	// crio version 1.13.0
+	// commit: ""
+	line := strings.Split(ver, "\n")[0]
+	return strings.Replace(line, "crio version ", "", 1)
+}
+
 // SocketPath returns the path to the socket file for CRIO
 func (r *CRIO) SocketPath() string {
 	if r.Socket != "" {

pkg/minikube/cruntime/cruntime.go

@@ -34,6 +34,8 @@ type CommandRunner interface {
 type Manager interface {
 	// Name is a human readable name for a runtime
 	Name() string
+	// Version retrieves the current version of this runtime
+	Version() string
 	// Enable idempotently enables this runtime on a host
 	Enable() error
 	// Disable idempotently disables this runtime on a host

pkg/minikube/cruntime/docker.go

@@ -37,6 +37,17 @@ func (r *Docker) Name() string {
 	return "Docker"
 }
 
+// Version retrieves the current version of this runtime
+func (r *Docker) Version() string {
+	// Note: the server daemon has to be running, for this call to return successfully
+	ver, err := r.Runner.CombinedOutput("docker version --format '{{.Server.Version}}'")
+	if err != nil {
+		return ""
+	}
+
+	return strings.Split(ver, "\n")[0]
+}
+
 // SocketPath returns the path to the socket file for Docker
 func (r *Docker) SocketPath() string {
 	return r.Socket

pkg/minikube/cruntime/rkt.go

@@ -18,6 +18,7 @@ package cruntime
 
 import (
 	"fmt"
+	"strings"
 
 	"github.com/golang/glog"
 )
@@ -33,6 +34,19 @@ func (r *Rkt) Name() string {
 	return "rkt"
 }
 
+// Version retrieves the current version of this runtime
+func (r *Rkt) Version() string {
+	ver, err := r.Runner.CombinedOutput("rkt version")
+	if err != nil {
+		return ""
+	}
+
+	// rkt Version: 1.24.0
+	// appc Version: 0.8.10
+	line := strings.Split(ver, "\n")[0]
+	return strings.Replace(line, "rkt Version: ", "", 1)
+}
+
 // SocketPath returns the path to the socket file for rkt/rktlet
 func (r *Rkt) SocketPath() string {
 	if r.Socket != "" {