* Chris Hopkins <cbehopk...@gmail.com> [171002 10:52]:
> out, err := os.Create(potential_file_name)
> switch t := err.(type) {
> case *os.PathError:
> switch t.Err {
> case os.ErrNotExist:
> log.Fatal("Invalid filename", potential_file_name)
> case os.ErrInvalid:
> log.Fatal("Invalid argument", potential_file_name)
> default :
I think what you are missing is that t.Err is almost certainly a
syscall.Errno, which you can type-switch and then use directly:
switch en := t.Err.(type) {
case syscall.Errno:
switch en {
case syscall.EISDIR:
...
}
default:
... // I don't think os.Create will ever return an error that
// isn't syscall.Errno wrapped as an os.PathError.
}
Of course, this is OS dependent. However, I think EISDIR is defined for
all supported architectures.
> switch t.Err.Error(){
> case "is a directory":
> // Case we are trying to catch
> return
> default:
> log.Fatalf("Unknown
> os.PathError\n\"%s\"\n%v\n,Type:%t\nDir:%s\nUrl:%s\n", potential_file_name,
> t.Err, t.Err, dir_str, fetch_url)
> }
> }
> case nil:
> // nothing to see here
> default:
> log.Fataf("Error is of type %T,n", err)
> }
...Marvin
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