dh-elpa: initial chicken scratchings in the dirt

One function "borrowed" from package.el. We don't want to rely on the
private (seeming) API, and anyway it's easier to modify certain
aspects, like byte compiling.

1 files changed, 15 insertions, 0 deletions

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+* package.el
+
+- package-directory-list (v)
+  list of additional directories containing elpa packages. In particular this has an emacs version specific directory where we can install byte compiled files.
+
+- package-unpack (f) 
+
+  does the actual installation, using dynamically bound
+  *package-user-dir*. The current version is safe to call without
+  network access, but it's probably considered internal.
+
+* workflow
+** at package build time
+- install using package-unpack (or workalike) into 
+  $(DESTDIR)/usr/share/emacs/site-lisp/elpa