add option to register only for an eab setup

cmd/cmd.go

@@ -5,6 +5,7 @@ import "github.com/urfave/cli/v2"
 // CreateCommands Creates all CLI commands.
 func CreateCommands() []*cli.Command {
 	return []*cli.Command{
+		createRegister(),
 		createRun(),
 		createRevoke(),
 		createRenew(),

cmd/cmd_register.go

@@ -0,0 +1,44 @@
+package cmd
+
+import (
+	"fmt"
+
+	"github.com/go-acme/lego/v4/log"
+	"github.com/urfave/cli/v2"
+)
+
+func createRegister() *cli.Command {
+	return &cli.Command{
+		Name:  "register",
+		Usage: "Register an account",
+		Before: func(ctx *cli.Context) error {
+			return nil
+		},
+		Action: registerAction,
+		Flags:  []cli.Flag{},
+	}
+}
+
+func registerAction(ctx *cli.Context) error {
+	accountsStorage := NewAccountsStorage(ctx)
+
+	account, client := setup(ctx, accountsStorage)
+	setupChallenges(ctx, client)
+
+	if account.Registration == nil {
+		reg, err := register(ctx, client)
+		if err != nil {
+			log.Fatalf("Could not complete registration\n\t%v", err)
+		}
+
+		account.Registration = reg
+		if err = accountsStorage.Save(account); err != nil {
+			log.Fatal(err)
+		}
+
+		fmt.Printf(rootPathWarningMessage, accountsStorage.GetRootPath())
+		return err
+	}
+
+	return nil
+}

cmd/cmd_run.go

@@ -17,7 +17,7 @@ import (
 func createRun() *cli.Command {
 	return &cli.Command{
 		Name:  "run",
-		Usage: "Register an account, then create and install a certificate",
+		Usage: "Register an account (if not registered), then create and install a certificate",
 		Before: func(ctx *cli.Context) error {
 			// we require either domains or csr, but not both
 			hasDomains := len(ctx.StringSlice("domains")) > 0