Migrate the webhook-certgen program to inside ingress repo (#7475)

images/kube-webhook-certgen/rootfs/cmd/root.go

@@ -0,0 +1,83 @@
+package cmd
+
+import (
+	"os"
+
+	"github.com/onrik/logrus/filename"
+	log "github.com/sirupsen/logrus"
+	"github.com/spf13/cobra"
+	admissionv1 "k8s.io/api/admissionregistration/v1"
+)
+
+var (
+	rootCmd = &cobra.Command{
+		Use:   "kube-webhook-certgen",
+		Short: "Create certificates and patch them to admission hooks",
+		Long: `Use this to create a ca and signed certificates and patch admission webhooks to allow for quick
+	           installation and configuration of validating and admission webhooks.`,
+		PreRun: configureLogging,
+		Run:    rootCommand,
+	}
+
+	cfg = struct {
+		logLevel           string
+		logfmt             string
+		secretName         string
+		namespace          string
+		certName           string
+		keyName            string
+		host               string
+		webhookName        string
+		patchValidating    bool
+		patchMutating      bool
+		patchFailurePolicy string
+		kubeconfig         string
+	}{}
+
+	failurePolicy admissionv1.FailurePolicyType
+)
+
+// Execute is the main entry point for the program
+func Execute() {
+	if err := rootCmd.Execute(); err != nil {
+		os.Exit(1)
+	}
+}
+
+func init() {
+	filenameHook := filename.NewHook()
+	filenameHook.Field = "source"
+	log.AddHook(filenameHook)
+	log.SetOutput(os.Stdout)
+	log.SetLevel(log.TraceLevel)
+	rootCmd.Flags()
+	rootCmd.PersistentFlags().StringVar(&cfg.logLevel, "log-level", "info", "Log level: panic|fatal|error|warn|info|debug|trace")
+	rootCmd.PersistentFlags().StringVar(&cfg.logfmt, "log-format", "json", "Log format: text|json")
+	rootCmd.PersistentFlags().StringVar(&cfg.kubeconfig, "kubeconfig", "", "Path to kubeconfig file: e.g. ~/.kube/kind-config-kind")
+}
+
+func configureLogging(_ *cobra.Command, _ []string) {
+	l, err := log.ParseLevel(cfg.logLevel)
+	if err != nil {
+		log.WithField("err", err).Fatal("Invalid error level")
+	}
+	log.SetLevel(l)
+	log.SetFormatter(getFormatter(cfg.logfmt))
+}
+
+func rootCommand(cmd *cobra.Command, _ []string) {
+	cmd.Help()
+	os.Exit(1)
+}
+
+func getFormatter(logfmt string) log.Formatter {
+	switch logfmt {
+	case "json":
+		return &log.JSONFormatter{}
+	case "text":
+		return &log.TextFormatter{}
+	}
+
+	log.Fatalf("invalid log format '%s'", logfmt)
+	return nil
+}