[pkg-gnupg-maint] Bug#913614: Bug#913614: gnupg2 fails with "cannot open '/dev/tty': No such device or address"

[Tianon Gravi]

On Tue, 13 Nov 2018 15:18:22 +0100 Werner Koch <wk at gnupg.org> wrote:
> For any script use you should anyway use --batch which disables the use
> of the tty as a side-effect.

Even for something that shouldn't have a reason to prompt, like
"--recv-keys" with a full fingerprint?

It makes some sense logically, but seems a bit overkill (and worked
fine without in the previous Debian Stable version of gnupg), and is
now a pretty common pattern in the Docker ecosystem (I've seen failing
builds in a huge number of repositories now with this exact
tty-related error on similar "--recv-keys" invocations).

Would it make sense to detect that there's no TTY present and assume
batch mode?  (apologies if something like that's been proposed before)

(And to be explicitly clear, your work on GnuPG is appreciated!)

♥,
- Tianon
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