Obnam should have a gnupg-home setting to set the GnuPG home directory
(~/.gnupg), or possibly a gnupg-option string list setting to pass
any options to GnuPG.
--liw
The home directory can be set with $GNUPGHOME environment variable.
Additional settings can be set in the config in that directory. An
Obnam setting seems unnecessary, therefore. I'll add it if I am told
of a specific example of why it's useful. --liw