GPGME::Crypto#encrypt throws an Errno::EBADF exception

[ueno]

GPGME::Crypto#encrypt throws an Errno::EBADF exception

[vakuum]

Closing the file handle in the passphrase callback solved the problem.

Thank you!

[ueno]

I'm still looking for a proper way to fix this, but for your use-case, a workaround would be to use a custom passphrase callback and call IO#close at the end:

def pass_function(pass, uid_hint, passphrase_info, prev_was_bad, fd)
  io = IO.for_fd(fd, 'w')
  io.puts 'password'
  io.flush
  io.close
end

crypto = GPGME::Crypto.new(armor: false, symmetric: true,
                           passphrase_callback: method(:pass_function))

However, I doubt that we can simply do that in our default callback, as other gpgme engines might assume the FD is never closed.