create_cluster_minikube.go

package cmd

import (
	"bytes"
	"io"
	"os"
	"os/exec"
	"runtime"
	"strings"

	"github.com/jenkins-x/jx/pkg/jx/cmd/log"
	"github.com/jenkins-x/jx/pkg/jx/cmd/templates"
	cmdutil "github.com/jenkins-x/jx/pkg/jx/cmd/util"
	"github.com/jenkins-x/jx/pkg/util"
	"github.com/spf13/cobra"
	"gopkg.in/AlecAivazis/survey.v1"
)

// CreateClusterOptions the flags for running crest cluster
type CreateClusterMinikubeOptions struct {
	CreateClusterOptions

	Flags    CreateClusterMinikubeFlags
	Provider KubernetesProvider
}

type CreateClusterMinikubeFlags struct {
	Memory              string
	CPU                 string
	Driver              string
	HyperVVirtualSwitch string
}

var (
	createClusterMinikubeLong = templates.LongDesc(`
		This command creates a new kubernetes cluster, installing required local dependencies and provisions the
		Jenkins X platform

		Minikube is a tool that makes it easy to run Kubernetes locally. Minikube runs a single-node Kubernetes
		cluster inside a VM on your laptop for users looking to try out Kubernetes or develop with it day-to-day.

`)

	createClusterMinikubeExample = templates.Examples(`

		jx create cluster minikube

`)
)

// NewCmdGet creates a command object for the generic "init" action, which
// installs the dependencies required to run the jenkins-x platform on a kubernetes cluster.
func NewCmdCreateClusterMinikube(f cmdutil.Factory, out io.Writer, errOut io.Writer) *cobra.Command {
	options := CreateClusterMinikubeOptions{
		CreateClusterOptions: CreateClusterOptions{
			CreateOptions: CreateOptions{
				CommonOptions: CommonOptions{
					Factory: f,
					Out:     out,
					Err:     errOut,
				},
			},
			Provider: MINIKUBE,
		},
	}
	cmd := &cobra.Command{
		Use:     "minikube",
		Short:   "Create a new kubernetes cluster with minikube: Runs locally",
		Long:    createClusterMinikubeLong,
		Example: createClusterMinikubeExample,
		Run: func(cmd *cobra.Command, args []string) {
			options.Cmd = cmd
			options.Args = args
			err := options.Run()
			cmdutil.CheckErr(err)
		},
	}

	options.addCreateClusterFlags(cmd)

	cmd.Flags().StringVarP(&options.Flags.Memory, "memory", "m", "4096", "Amount of RAM allocated to the minikube VM in MB")
	cmd.Flags().StringVarP(&options.Flags.CPU, "cpu", "c", "3", "Number of CPUs allocated to the minikube VM")
	cmd.Flags().StringVarP(&options.Flags.Driver, "vm-driver", "d", "", "VM driver is one of: [virtualbox xhyve vmwarefusion hyperkit]")
	cmd.Flags().StringVarP(&options.Flags.HyperVVirtualSwitch, "hyperv-virtual-switch", "v", "", "Additional options for using HyperV with minikube")

	return cmd
}

func (o *CreateClusterMinikubeOptions) Run() error {
	var deps []string
	d := binaryShouldBeInstalled("minikube")
	if d != "" {
		deps = append(deps, d)
	}

	err := o.installMissingDependencies(deps)
	if err != nil {
		log.Errorf("error installing missing dependencies %v, please fix or install manually then try again", err)
		os.Exit(-1)
	}

	if o.isExistingMinikubeRunning() {
		log.Error("an existing minikube cluster is already running, perhaps use jx install")
		os.Exit(-1)
	}

	err = o.createClusterMinikube()
	if err != nil {
		log.Errorf("error creating cluster %v", err)
		os.Exit(-1)
	}

	return nil
}

func (o *CreateClusterMinikubeOptions) defaultMacVMDriver() string {
	_, err := o.getCommandOutput("", "hyperkit", "-v")
	if err != nil {
		o.warnf("Could not find hyperkit on your PATH. If you install Docker for Mac then we could use hyperkit.\nSee: https://docs.docker.com/docker-for-mac/install/\n")
		return "xhyve"
	}
	return "hyperkit"
}

func (o *CreateClusterMinikubeOptions) isExistingMinikubeRunning() bool {

	var cmd_out bytes.Buffer

	e := exec.Command("minikube", "status")
	e.Stdout = &cmd_out
	e.Stderr = o.Err
	err := e.Run()

	if err != nil {
		return false
	}

	if strings.Contains(cmd_out.String(), "Running") {
		return true
	}

	return false
}

func (o *CreateClusterMinikubeOptions) createClusterMinikube() error {

	mem := o.Flags.Memory
	prompt := &survey.Input{
		Message: "memory (MB)",
		Default: mem,
		Help:    "Amount of RAM allocated to the minikube VM in MB",
	}
	survey.AskOne(prompt, &mem, nil)

	cpu := o.Flags.CPU
	prompt = &survey.Input{
		Message: "cpu (cores)",
		Default: cpu,
		Help:    "Number of CPUs allocated to the minikube VM",
	}
	survey.AskOne(prompt, &cpu, nil)

	vmDriverValue := o.Flags.Driver

	if len(vmDriverValue) == 0 {
		switch runtime.GOOS {
		case "darwin":
			vmDriverValue = o.defaultMacVMDriver()
		case "windows":
			vmDriverValue = "hyperv"
		case "linux":
			vmDriverValue = "kvm"
		default:
			vmDriverValue = "virtualbox"
		}
	}

	// only add drivers that are appropriate for this OS
	var driver string
	drivers := []string{vmDriverValue}
	if vmDriverValue != "virtualbox" {
		drivers = append(drivers, "virtualbox")
	}
	if runtime.GOOS == "darwin" {
		if util.StringArrayIndex(drivers, "xhyve") < 0 {
			drivers = append(drivers, "xhyve")
		}
	}
	if runtime.GOOS == "linux" {
		drivers = append(drivers,"none")
	}

	prompts := &survey.Select{
		Message: "Select driver:",
		Options: drivers,
		Default: vmDriverValue,
		Help:    "VM driver, defaults to recommended native virtualisation",
	}

	err := survey.AskOne(prompts, &driver, nil)
	if err != nil {
		return err
	}

	err = o.doInstallMissingDependencies([]string{driver})
	if err != nil {
		log.Errorf("error installing missing dependencies %v, please fix or install manually then try again", err)
		os.Exit(-1)
	}

	args := []string{"start", "--memory", mem, "--cpus", cpu, "--vm-driver", driver}
	hyperVVirtualSwitch := o.Flags.HyperVVirtualSwitch
	if hyperVVirtualSwitch != "" {
		args = append(args, "--hyperv-virtual-switch", hyperVVirtualSwitch)
	}
	err = o.runCommand("minikube", args...)
	if err != nil {
		return err
	}

	// call jx init
	initOpts := &InitOptions{
		CommonOptions: o.CommonOptions,
	}
	err = initOpts.Run()
	if err != nil {
		return err
	}

	// call jx install
	installOpts := &InstallOptions{
		CommonOptions:      o.CommonOptions,
		CloudEnvRepository: DEFAULT_CLOUD_ENVIRONMENTS_URL,
		KubernetesProvider: MINIKUBE,     // TODO replace with context, maybe get from ~/.jx/gitAuth.yaml?
		GitProvider:        "github.com", // TODO use the correct gitserver
	}
	err = installOpts.Run()
	if err != nil {
		return err
	}

	return nil
}