emacs packages and elpa

[Cayetano Santos]

Hello Guix,

  We distribute emacs packages from gnu/elpa by downloading .tar files
  from there: I’m thinking about emacs-ggtags.

  My first concern is, what emacs-ggtags 0.9.0 corresponds to exactly ?
  There is no 0.9.0 tag in upstream github reposotory, and, if I
  understand it correctly, elpa just mirrors it

    https://git.savannah.gnu.org/cgit/emacs/elpa.git/log/?h=externals/ggtags

  So what exactly 0.9.0 is ? They bump on the 2018-07-26.  Does it refer
  to something more recent ? How to know ? This is for sure elpa
  related, ... but we are distributing packages based on their criteria.
  It would be great to understand how it goes (at this point, I cannot
  clone elpa, for some reason).

  My second concern is, how do we distribute some more up to date (think
  emacs-magit), if we use a .tar from elpa ? When developer decides not
  to / forgets to tag a new release, how do we proceed ? Do we use
  elpa.gnu.org/devel instead ? I cannot see any example of guix sources.

Best,

C.