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bug#19296: [PATCH] Package archives now have priorities.

From: Jorgen Schaefer
Subject: bug#19296: [PATCH] Package archives now have priorities.
Date: Mon, 15 Dec 2014 09:36:10 +0100
User-agent: Mozilla/5.0 (X11; Linux i686; rv:31.0) Gecko/20100101 Icedove/31.2.0

On 12/15/2014 05:59 AM, Stefan Monnier wrote:

What requirements would a patch need to fulfill that you deem it
acceptable to be applied to the Emacs repository that solves my
original problem (i.e. only install packages from a given repository if
the package is not available from other repositories)?

I'd like a solution that also addresses, at least partly, the other
problem (the one where the MELPA version is superseded by a version
elsewhere such as in GNU ELPA).
It's not important to automatically upgrade the package from the MELPA
version to the GNU ELPA version, but the user should somehow be warned
at some point that the MELPA version is not the latest any more.

So a warning "this package was installed from archive X, but is not available from there anymore" would suffice to fulfill this requirement, correct? Would it be enough if the package list displayed a string like "changed archive" or similar? (This needs a shorter name.)

I think in general it would be desirable to try and remember where
a package came from so that upgrading to a version in another repository
doesn't happen automatically.

I can see two ways for this. One, we overwrite the package's -pkg.el file on install time with an expanded version that includes our own infos, e.g. :archive "name" for this (`package-generate-description-file' already has the code to generate this file, and it just needs to be called even if the file already exists). Alternatively, we add an .archive file to the package directory recording the archive this came from.

I would tend to lean to overriding the -pkg.el file, but I do not have any big preferences. Which way would you prefer?

In either case, we should populate the pkg-desc in `package-alist' from this, which should make it easy to implement the display above.

If I add this functionality, will that make the reminder of the patch acceptable to be included in Emacs?


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