Create a io.Reader from a local file

Question

I would like to open a local file, and return a io.Reader. The reason is that I need to feed a io.Reader to a library I am using, like:

Answer 1

Use os.Open():

func Open(name string) (file *File, err error)

Open opens the named file for reading. If successful, methods on the returned file can be used for reading; the associated file descriptor has mode O_RDONLY. If there is an error, it will be of type *PathError.

The returned value of type *os.File implements the io.Reader interface.