func resourceArchiveFileRead(d *schema.ResourceData, meta interface{}) error {
outputPath := d.Get("output_path").(string)
fi, err := os.Stat(outputPath)
if os.IsNotExist(err) {
d.SetId("")
d.MarkNewResource()
return nil
}
sha, err := genFileSha1(outputPath)
if err != nil {
return fmt.Errorf("could not generate file checksum sha: %s", err)
}
d.Set("output_sha", sha)
d.Set("output_size", fi.Size())
d.SetId(d.Get("output_sha").(string))
return nil
}