GNU bug report logs - #76568
'package-install' should not install duplicate packages

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From: Eli Zaretskii <eliz <at> gnu.org>
To: Ship Mints <shipmints <at> gmail.com>, Philip Kaludercic <philipk <at> posteo.net>
Cc: 76568 <at> debbugs.gnu.org
Subject: bug#76568: 'package-install' should not install duplicate packages
Date: Wed, 26 Feb 2025 15:31:52 +0200

> From: Ship Mints <shipmints <at> gmail.com>
> Date: Tue, 25 Feb 2025 15:52:02 -0500
> 
> As part of my production upgrade to 30.1, and before I wrote a program to install my local ELPA tree from
> scratch, I tried to first curate my packages and change from MELPA to generally equivalent GNU ELPA or
> non-GNU ELPA archives.  The result was that I had two of each package installed.
> 
> I think there's a bug in 'package-install' which, when invoked from 'package-install-button-action', processes
> the new package spec, and incorrectly checks to see if the package is already installed.  Interactive
> invocation of 'package-install' yields the package name from the prompt, not its archive description.
> 
> If the below is correct, I can submit a patch to make 'package-install' behave like 'package-reinstall' for the
> non-interactive case.
> 
> (defun package-install (pkg &optional dont-select)
> ...
>     (if-let* ((transaction
>                (if (package-desc-p pkg)
> ;; Problem seems to be here.  If the new pkg desc is for a 
> ;; different archive directory name style, package-installed-p
> ;; fails as it checks to see if the new directory exists (which
> ;; does not), ignoring the old archive directory.
>                    (unless (package-installed-p pkg)
>                      (package-compute-transaction (list pkg)
>                                                   (package-desc-reqs pkg)))
> 
> In contrast, 'package-reinstall' does the right thing by first deleting the existing package before installing the
> new one.
> 
> (defun package-reinstall (pkg)
> ...
>   (package-delete
>    (if (package-desc-p pkg) pkg (cadr (assq pkg package-alist)))
>    'force 'nosave)
>   (package-install pkg 'dont-select))

Philip, any comments or suggestions?

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