更新获取当前用户名的逻辑

使用user.Current()优先获取当前进程的真实用户，以解决通过sudo执行时显示原始用户的问题。如果user.Current()返回有效用户名，则直接返回；否则继续使用环境变量"USER"作为回退方案。

internal/osutil/osutil.go

@@ -36,6 +36,13 @@ func IsExist(path string) bool {
 
 // CurrentUsername returns the username of the current user.
 func CurrentUsername() string {
+	// To get the real user of the current process, you should use user.Current(),
+	// and USER may not be the real user of the process (for example, executing it
+	// through sudo will display the original user)
+	if currentUser, err := user.Current(); err == nil && currentUser != nil && len(currentUser.Username) > 0 {
+		return currentUser.Username
+	}
+
 	username := os.Getenv("USER")
 	if len(username) > 0 {
 		return username
@@ -45,9 +52,5 @@ func CurrentUsername() string {
 	if len(username) > 0 {
 		return username
 	}
-
-	if user, err := user.Current(); err == nil {
-		username = user.Username
-	}
 	return username
 }