Initial upgrade flow for control-plane

clitools/pkg/node/uboot/env_writer.go

@@ -2,6 +2,7 @@ package uboot
 
 import (
 	"context"
+	"errors"
 	"fmt"
 	"strings"
 	"time"
@@ -11,6 +12,8 @@ import (
 	"example.com/monok8s/pkg/system"
 )
 
+var ErrEnvNotFound = errors.New("fw env not found")
+
 func NewFWEnvWriter(configPath string, ctlPath string) *FWEnvWriter {
 	return &FWEnvWriter{
 		Runner: system.NewRunner(system.RunnerConfig{
@@ -38,8 +41,12 @@ func (w *FWEnvWriter) GetEnv(ctx context.Context, key string) (string, error) {
 	res, err := w.Runner.RunWithOptions(ctx, w.CtlPath, args, system.RunOptions{Quiet: true})
 	if err != nil {
 		if res != nil {
-			return "", fmt.Errorf("fw-printenv %q: %w (stdout=%q stderr=%q)",
-				key, err, strings.TrimSpace(res.Stdout), strings.TrimSpace(res.Stderr))
+			if strings.Contains(res.Stderr, "not defined") {
+				return "", ErrEnvNotFound
+			} else {
+				return "", fmt.Errorf("fw-printenv %q: %w (stdout=%q stderr=%q)",
+					key, err, strings.TrimSpace(res.Stdout), strings.TrimSpace(res.Stderr))
+			}
 		}
 		return "", fmt.Errorf("fw-printenv %q: %w", key, err)
 	}