Re: pgg-encrypt is a pain in the neck

[Daiki Ueno <ueno@unixuser.org>]

>>>>> In <E1H18w2-0007Px-5V@fencepost.gnu.org> 
>>>>>	Richard Stallman <rms@gnu.org> wrote:
>     2. Mail encryption with PGG works in message mode, which can be used
>        independently from Gnus and has it's own manual, too.

>     The message mode manual already refers to the PGG manual, so I don't
>     think any addition is needed.  But if you think we should urge the
>     users more explicit to use gpg-agent, then the message mode manual
>     would be the right place, IMHO.

> Ok, point taken.  Would someone please install the gpg-agent
> directions there?

Do you mean "the gpg agent directions" is one I wrote?  You asked me to
write a documentation of gpg-agent usage for the Emacs Manual, and I
sent the following to you privately.

Some Emacs commands internally call GnuPG (the @command{gpg} command)
to perform data encryption, and in certain cases (decrypting or
signing for example), @command{gpg} requires user's passphrase.
Currently the recommended way to supply your passphrase to
@command{gpg} is to use the @command{gpg-agent} program.

To use @command{gpg-agent} in Emacs, you need to run the following
command from the shell before starting Emacs.

@example
eval `gpg-agent --daemon`
@end example

This will invoke @command{gpg-agent} and set the environment variable
@code{GPG_AGENT_INFO} to allow @command{gpg} to communicate with it.
It might be good idea to put this command in your @file{.xsession} or
@file{.bash_profile}.  @xref{Invoking GPG-AGENT, , , gnupg, Using the
GNU Privacy Guard}.

Once your @command{gpg-agent} is set up, it will ask you for a
passphrase as needed for @command{gpg}.  Under the X Window System,
you will see a new passphrase input dialog appear.  The dialog is
provided by PIN Entry (the @command{pinentry} command), and as of
version 0.7.2, @command{pinentry} cannot cooperate with Emacs on a
single tty.  So, if you are using a text console, you may need to put
a passphrase into gpg-agent's cache beforehand.  The following command
does the trick.

@example
gpg --use-agent --sign < /dev/null > /dev/null
@end example

The Lisp variable @code{pgg-gpg-use-agent} controls whether to use
@command{gpg-agent}.  See also @xref{Caching passphrase, , , pgg, The
PGG Manual}.

-- 
Daiki Ueno