settings: Perform write process atomic

internal/config/settings.go

@@ -4,6 +4,7 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
+	"io/fs"
 	"os"
 	"path/filepath"
 	"reflect"
@@ -150,6 +151,13 @@ var (
 	VolatileSettings map[string]bool
 )
 
+func writeFile(name string, txt []byte) error {
+	if _, err := os.Stat(name); errors.Is(err, fs.ErrNotExist) {
+		return os.WriteFile(name, txt, util.FileMode)
+	}
+	return util.SafeWriteInternal(name, txt, false)
+}
+
 func init() {
 	ModifiedSettings = make(map[string]bool)
 	VolatileSettings = make(map[string]bool)
@@ -341,7 +349,8 @@ func WriteSettings(filename string) error {
 		}
 
 		txt, _ := json.MarshalIndent(parsedSettings, "", "    ")
-		err = os.WriteFile(filename, append(txt, '\n'), util.FileMode)
+		txt = append(txt, '\n')
+		err = writeFile(filename, txt)
 	}
 	return err
 }
@@ -362,8 +371,9 @@ func OverwriteSettings(filename string) error {
 			}
 		}
 
-		txt, _ := json.MarshalIndent(settings, "", "    ")
-		err = os.WriteFile(filename, append(txt, '\n'), util.FileMode)
+		txt, _ := json.MarshalIndent(parsedSettings, "", "    ")
+		txt = append(txt, '\n')
+		err = writeFile(filename, txt)
 	}
 	return err
 }