How can I get a file's group ID (GID) in Go?

Question

os.Stat() returns a FileInfo object, which has a Sys() method that returns an Interface{} with no methods.

Though I am able to

Answer 1

The reflect module showed that the data type for Sys()'s return is *syscall.Stat_t, so this seems to work to get the Gid of a file as a string:

file_info, _ := os.Stat(abspath)
file_sys := file_info.Sys()
file_gid := fmt.Sprint(file_sys.(*syscall.Stat_t).Gid)

Please let me know if there is a better way to do this.