also write command debug line to stderr

internal/state/state.go

@@ -3,6 +3,7 @@ package state
 import (
 	"context"
 	"fmt"
+	"io"
 	"os"
 	"strings"
 
@@ -87,25 +88,27 @@ func (c *state) newClient() (hcapi2.Client, error) {
 			return nil, err
 		}
 
+		var debugWriter io.Writer
 		if filePath == "" {
-			opts = append(opts, hcloud.WithDebugWriter(os.Stderr))
+			debugWriter = os.Stderr
 		} else {
 			f, err := os.OpenFile(filePath, os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0644)
 			if err != nil {
 				return nil, err
 			}
+			debugWriter = f
+		}
 
-			quotedArgs := make([]string, 0, len(os.Args))
-			for _, arg := range os.Args {
-				quotedArgs = append(quotedArgs, fmt.Sprintf("%q", arg))
-			}
-			_, err = f.WriteString("--- Command:\n" + strings.Join(quotedArgs, " ") + "\n\n\n\n")
-			if err != nil {
-				return nil, err
-			}
-
-			opts = append(opts, hcloud.WithDebugWriter(f))
+		quotedArgs := make([]string, 0, len(os.Args))
+		for _, arg := range os.Args {
+			quotedArgs = append(quotedArgs, fmt.Sprintf("%q", arg))
 		}
+		_, err = debugWriter.Write([]byte("--- Command:\n" + strings.Join(quotedArgs, " ") + "\n\n\n\n"))
+		if err != nil {
+			return nil, err
+		}
+
+		opts = append(opts, hcloud.WithDebugWriter(debugWriter))
 	}
 
 	pollInterval, err := config.OptionPollInterval.Get(c.config)