Re: Allowing rolling release packages on ELPA

[Stefan Monnier <monnier@iro.umontreal.ca>]

> How does this look like:

LGTM, thanks.

[ We may want to refine this later, e.g. to avoid the resulting
  redundancy between GNU and GNU-devel, but I'm not sure yet what we'll
  want to do it about it, so let's see how it works first.  ]


        Stefan


> From 6f746b919d3a377cf8ef0f9aa34ebbf9969b0188 Mon Sep 17 00:00:00 2001
> From: Philip Kaludercic <philipk@posteo.net>
> Date: Sun, 16 Oct 2022 18:05:40 +0200
> Subject: [PATCH] Add support for rolling-release packages
>
> * README: Document :rolling-release
> * elpa-admin.el (elpaa--get-release-revision): Respect
> :rolling-release.
> (elpaa--make-one-package): Respect :rolling-release.
> ---
>  README        | 11 ++++++++++-
>  elpa-admin.el | 10 +++++++++-
>  2 files changed, 19 insertions(+), 2 deletions(-)
>
> diff --git a/README b/README
> index 4ff305047a..1c42f13cd7 100644
> --- a/README
> +++ b/README
> @@ -1,5 +1,5 @@
>  #+TITLE: ELPA-Admin README
> -#+DATE: 2022-01-06
> +#+DATE: 2022-10-26
>  
>  Copyright (C) 2010-2022 Free Software Foundation, Inc. \\
>  See the end of the file for license conditions.
> @@ -168,6 +168,15 @@ this ORIG-VERSION (or REMAPPED-VERSION if non-nil) to override
>  the default heuristic which uses the last revision that modified the
>  "Version:" header.
>  
> +** =:rolling-release FLAG=
> +If FLAG is non-nil, a new package will be released for every new
> +commit, instead of just on incrementing the "Version" header.  FLAG
> +can optionally be a string, in which case the package is only released
> +if the version is equal to FLAG.
> +
> +Note that the usage of this option is discouraged.  Only use it if the
> +package maintainer explicitly wishes to use a "rolling release" model.
> +
>  * Configuration (elpa-config)
>  
>  The configuration file is a `lisp-data-mode` file containing
> diff --git a/elpa-admin.el b/elpa-admin.el
> index a1eec9c448..7ed78430d6 100644
> --- a/elpa-admin.el
> +++ b/elpa-admin.el
> @@ -194,6 +194,7 @@ commit which modified the \"Version:\" pseudo header."
>                (not (member vers (car version-map))))
>      (pop version-map))
>    (or (nth 2 (car version-map))
> +      (and (elpaa--spec-get pkg-spec :rolling-release) "HEAD")
>        ;; When the mainfile is a symlink (e.g. for :core packages), run Git
>        ;; in the directory that holds the actual file, otherwise Git won't
>        ;; know what file we're talking about.
> @@ -945,7 +946,8 @@ place the resulting tarball into the file named TARBALL-ONLY."
>                                           dir pkg-spec
>                                           `(nil ,devel-vers
>                                                 . ,(nthcdr 2 metadata))
> -                                         nil tarball-only))))
> +                                         nil tarball-only)))
> +             (rolling-release (elpaa--spec-get pkg-spec :rolling-release)))
>  
>          ;; Try and build the latest release tarball.
>          (cond
> @@ -972,7 +974,13 @@ place the resulting tarball into the file named TARBALL-ONLY."
>                         tarball dir pkg-spec metadata
>                         (lambda () (cdr last-rel)))
>                    (elpaa--release-email pkg-spec metadata dir)))))))
> +         ((and (stringp rolling-release)
> +               (not (version= rolling-release vers)))
> +          (elpaa--message "Expected version %s, but got %s for package %s!"
> +                          rolling-release vers  pkgname))
>           (t
> +          (when rolling-release
> +            (setq vers devel-vers))
>            (let ((tarball (concat elpaa--release-subdir
>                                   (format "%s-%s.tar" pkgname vers))))
>              (when (elpaa--make-one-tarball