Using GnuPG and its daemon gpg-agent

[T o n g <mlist4suntong@yahoo.com>]

Hi, 

I'm using gpg-agent to remember and supply my GnuPG password when 
building packages. But I'm still confused how gpg-agent works. I invoke 
gpg-agent as:

  eval $(gpg-agent --daemon)

It works sometimes. But what bothers me is that sometimes it doesn't 
work. I.e., sometimes the building process asks for my GnuPG passwords 
once, sometimes none, and sometimes many times. This all happens during 
one single bash session, after I've invoked gpg-agent as before. Not 
being asked for password this time doesn't guarantee that I won't get 
asked for password next time. I still haven't figure out why gpg decides 
to prompt me for password and why it doesn't.

Does it happen to you as well?

Thanks