virtctl boiler plate

.gitignore

@@ -6,6 +6,7 @@ cmd/virt-controller/virt-controller
 cmd/virt-launcher/virt-launcher
 cmd/virt-handler/virt-handler
 cmd/virt-api/virt-api
+cmd/virtctl/virtctl
 manifests/*.yaml
 **/bin
 bin/*

cmd/virtctl/virtctl.go

@@ -0,0 +1,69 @@
+package main
+
+import (
+	"os"
+
+	"fmt"
+	flag "github.com/spf13/pflag"
+	"kubevirt.io/kubevirt/pkg/virtctl"
+	"log"
+)
+
+func main() {
+
+	log.SetFlags(0)
+	log.SetOutput(os.Stderr)
+
+	registry := map[string]virtctl.App{
+		"options": &virtctl.Options{},
+	}
+
+	for cmd, app := range registry {
+		f := app.FlagSet()
+		f.Bool("help", false, "Print usage.")
+		f.MarkHidden("help")
+		flags, err := Parse(cmd, f)
+
+		if err != nil {
+			if flags == nil {
+				// No subcommand specified
+				break
+			}
+		}
+		if flags != nil {
+			h, _ := flags.GetBool("help")
+			if h || err != nil {
+				fmt.Fprint(os.Stderr, app.Usage())
+				return
+			}
+			os.Exit(app.Run(flags))
+		}
+	}
+
+	Usage()
+	os.Exit(1)
+}
+
+func Parse(cmd string, flags *flag.FlagSet) (*flag.FlagSet, error) {
+	flags.AddFlagSet((&virtctl.Options{}).FlagSet())
+	err := flags.Parse(os.Args[1:])
+	if len(flags.Args()) == 0 {
+		return nil, fmt.Errorf("No subcommand found")
+	}
+	foundCmd := flags.Arg(0)
+	if foundCmd != cmd {
+		return nil, nil
+	}
+	return flags, err
+}
+
+func Usage() {
+	fmt.Fprintln(os.Stderr,
+		`virtctl controll VM related operations on your kubernetes cluster.
+
+Basic Commands:
+
+Use "virtctl <command> --help" for more information about a given command.
+Use "virtctl options" for a list of global command-line options (applies to all commands).
+	`)
+}

hack/config.sh

@@ -1,4 +1,4 @@
-binaries="cmd/virt-controller cmd/virt-launcher cmd/virt-handler cmd/virt-api"
+binaries="cmd/virt-controller cmd/virt-launcher cmd/virt-handler cmd/virt-api cmd/virtctl"
 docker_images="$binaries images/haproxy images/iscsi-demo-target-tgtd images/vm-killer"
 docker_prefix=kubevirt
 docker_tag=${DOCKER_TAG:-latest}

pkg/virtctl/virtctl.go

@@ -0,0 +1,36 @@
+package virtctl
+
+import (
+	"fmt"
+	flag "github.com/spf13/pflag"
+	"os"
+)
+
+type App interface {
+	FlagSet() *flag.FlagSet
+	Run(flags *flag.FlagSet) int
+	Usage() string
+}
+
+type Options struct {
+}
+
+func (o *Options) FlagSet() *flag.FlagSet {
+
+	cf := flag.NewFlagSet("options", flag.ExitOnError)
+	cf.StringP("server", "s", "", "The address and port of the Kubernetes API server")
+	cf.StringP("namespace", "n", "default", "If present, the namespace scope for this CLI request")
+	cf.String("kubeconfig", "", "Path to the kubeconfig file to use for CLI requests")
+	return cf
+}
+
+func (o *Options) Run(flags *flag.FlagSet) int {
+	fmt.Fprintln(os.Stderr, o.Usage())
+	return 0
+}
+
+func (o *Options) Usage() string {
+	usage := "The following options can be passed to any command:\n\n"
+	usage += o.FlagSet().FlagUsages()
+	return usage
+}

vendor/vendor.json

@@ -306,6 +306,12 @@
 			"revision": "b061729afc07e77a8aa4fad0a2fd840958f1942a",
 			"revisionTime": "2016-09-27T10:08:44Z"
 		},
+		{
+			"checksumSHA1": "WZHF26m8UJ3WU5//TIDeUC3xs4o=",
+			"path": "github.com/spf13/pflag",
+			"revision": "d16db1e50e33dff1b6cdf37596cef36742128670",
+			"revisionTime": "2017-03-27T14:13:44Z"
+		},
 		{
 			"checksumSHA1": "xiderUuvye8Kpn7yX3niiJg32bE=",
 			"path": "golang.org/x/crypto/ssh/terminal",