Re: feature/package+vc 04c4c578c7 3/4: Allow for packages to be installed directly from VCS

[Stefan Monnier]

> +          ;; Add `package-vc' data
> +          (let ((spec (cdr pkg-spec))
> +                (ups (list :upstream 'Git nil nil nil)))
> +            (if (null (plist-get spec :url))
> +                (setf (nth 2 ups) (concat "https://git.savannah.gnu.org/git/";
> +                                          elpaa--gitrepo)
> +                      (nth 3 ups) (plist-get spec :lisp-dir)
> +                      (nth 4 ups) (concat elpaa--branch-prefix pkg))
> +              (setf (nth 2 ups) (plist-get spec :url)
> +                    (nth 3 ups) (plist-get spec :lisp-dir)
> +                    (nth 4 ups) (plist-get spec :branch)))
> +            (push ups extras))

I think rather than invent a new format and duplicate that info into
`archive-contents`, pushing us to worry about its size, I'd prefer to
just stash a copy of `elpa-packages` alongside `archive-contents`.


        Stefan