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Seeing `g.add_drive_opt :readonly => 1` allows one to imply that ensuring writable access to drive should happen via `g.add_drive_opt :readonly => 0`. However, the passed option value gets passed down to C according to Ruby Boolean semantics, that is, any value apart from `false` and `nil` will be true (see RTEST in Ruby C API). So its more idiomatic and provides a better hint if we use `g.add_drive_opt :readonly => true` in Ruby samples.
= Ruby bindings for libguestfs
The module Guestfs provides Ruby bindings for
{the libguestfs API}[http://libguestfs.org/guestfs.3.html].