feat(agent,command): add show-thumbprint command

internal/command/agent/root.go

@@ -14,6 +14,7 @@ func Root() *cli.Command {
 			openwrt.Root(),
 			config.Root(),
 			RunCommand(),
+			ShowThumbprintCommand(),
 		},
 	}
 }

internal/command/agent/show_thumbprint.go

@@ -0,0 +1,30 @@
+package agent
+
+import (
+	"fmt"
+
+	"forge.cadoles.com/Cadoles/emissary/internal/command/common"
+	"forge.cadoles.com/Cadoles/emissary/internal/machineid"
+	"github.com/pkg/errors"
+	"github.com/urfave/cli/v2"
+)
+
+func ShowThumbprintCommand() *cli.Command {
+	flags := common.Flags()
+
+	return &cli.Command{
+		Name:  "show-thumbprint",
+		Usage: "Show the current agent thumbprint",
+		Flags: flags,
+		Action: func(ctx *cli.Context) error {
+			thumbprint, err := machineid.Get()
+			if err != nil {
+				return errors.WithStack(err)
+			}
+
+			fmt.Println(thumbprint)
+
+			return nil
+		},
+	}
+}