How to use Gnupg's passphrase-fd argument?

Question

I would like to use GnuPG´s decrypt command without any user interation. The script\'s --passphrase-fd argument seems exactly what I need. But I do

Answer 1

kylehuff's answer still wouldn't work for me, with gpupg still popping up a password prompt.

According to https://wiki.archlinux.org/index.php/GnuPG#Unattended_passphrase with gnupg version 2.1.0 and higher, you need to do additional steps to support --passphrase-fd

First, edit the gpg-agent configuration to allow loopback pinentry mode: ~/.gnupg/gpg-agent.conf

allow-loopback-pinentry

Restart the gpg-agent process if it is running to let the change take effect.

Second, either the application needs to be updated to include a commandline parameter to use loopback mode like so:

$ gpg --pinentry-mode loopback ...