import "syscall"
func isExist(err error) bool {
- if pe, ok := err.(*PathError); ok {
+ switch pe := err.(type) {
+ case nil:
+ return false
+ case *PathError:
+ err = pe.Err
+ case *LinkError:
err = pe.Err
}
return err == syscall.EEXIST || err == ErrExist
}
func isNotExist(err error) bool {
- if pe, ok := err.(*PathError); ok {
+ switch pe := err.(type) {
+ case nil:
+ return false
+ case *PathError:
+ err = pe.Err
+ case *LinkError:
err = pe.Err
}
return err == syscall.ENOENT || err == ErrNotExist
}
func isPermission(err error) bool {
- if pe, ok := err.(*PathError); ok {
+ switch pe := err.(type) {
+ case nil:
+ return false
+ case *PathError:
+ err = pe.Err
+ case *LinkError:
err = pe.Err
}
return err == syscall.EACCES || err == syscall.EPERM || err == ErrPermission