Ellis,

Ellis Kenyő via Guix-patches via 写道：
> I was asking if there was a simple way to handle optional 
> inputs.

While this is an oxymoron for the reasons pointed out by Leo, 
there is _nothing_ wrong with simply leaving some variables at 
their default e.g.

  GPG_PROGRAM="gpg"

and letting yadm look them up at run time in its $PATH.

Does that not work?

For things like templates {native-,}search-paths can be a 
solution, depending on how yadm (or its templating library) 
searches for these.

Kind regards,

T G-R