unattended key deletion GnuPG 2.1

[HW42]

Hi,

I try to delete a public and it's secret key via gpgme. The problem is
that it always pops a pinentry confirmation dialog. Since I want do the
action unattended this is a problem.

By looking at the gpg-agent code it seems that there is currently no way
to do this. But maybe I missed something.

There are two possibly workarounds I have think of

1) use a fake pinentry which always says yes.
2) delete the key in private-keys-v1.d

but those are obviously crude hacks.

Thank you.

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