Using gpg with emacs mu4e and mbsync

Hi.

I am getting an error when trying to read a gpg encrypted file.

This was the command:

```
gpg -q --for-your-eyes-only --no-tty -d ~/.authinfo.gpg
```

Error:

```
gpg: Sorry, no terminal at all requested - can't get input
```

I think the `--no-tty` is needed because I'm trying to use it from the
emacs editor.

Would anyone here know how to fix this?

Any help would be appreciated.

Versions:

  - gpg: 2.2.27

  - emacs: 27.1

  - mbsync: 1.3.0

  - mu4e: 1.4

Background
==========
I'm trying to use mu4e package of emacs as mail client.
mbsync is used to fetch mails.
I got my mail password in a gpg encrypted file: ~/.authinfo.gpg

Now, I need to be able to run mbsync while within emacs/mu4e with the
password prompt showing up in its minibuffer.

For this, I put a 'pinentry loopback' in the conf file of gpg (config
files shown at end of this post).

I think this is not an editor problem because `mbsyc dirname` also
gives the same error about 'no terminal at all requested'

In emacs, it works fine when I open gpg encrypted file where the
editor will prompt me for password in the minibuffer and open the file
in its plain text form.

conf files
==========
These are the contents of the gpg conf files.

gpg.conf:

```
use-agent
pinentry-mode loopback
```

gpg-agent.conf:

```
pinentry-program /usr/bin/pinentry-curses
allow-emacs-pinentry
allow-loopback-pinentry
```

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