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  • "Make ${ROOT}/build read-only" and "freely add and remove files under ${ROOT}/build" are mutually exclusive... Commented Sep 13, 2016 at 4:25
  • @SatoKatsura They aren't. I am talking about the folder itself being read-only. Commented Sep 18, 2016 at 21:09
  • Adding and removing files involves writing to said files' parent directory. That's basic UNIX semantics. Commented Sep 19, 2016 at 3:41