bug#74604: 30.0.92; FR: M-x package-upgrade - offer an option to show a diff on upgrade

[Philip Kaludercic <philipk@posteo.net>]

Ship Mints <shipmints@gmail.com> writes:

> I like this idea, too. I spend a reasonable amount of time trying to
> understand what people have changed and if it will affect me negatively
> (the defensive part) or positively (for new features, user options,
> deprecations). Showing a source-code diff may be a bit technical for some
> users, though. I wonder if there could be either a link to a changelog, or
> a way to encourage a changelog convention so one could be displayed for
> users prior to a decision to update a package.

Note that packages can distribute this information.  Currently, if a
tarball includes a "news" file, it will be displayed by
`describe-package.  IIRC no package archive generates these right now.
But if we implement a user option like that described above (or below?),
then we can add that as an option as well.

The main issue is that not all package maintainers ensure that there are
changelog/news sources that ELPA could use to provide this information.

> -Stephane
>
> On Sun, Dec 1, 2024 at 5:06 PM Philip Kaludercic <philipk@posteo.net> wrote:
>
>> Daniel Mendler <mail@daniel-mendler.de> writes:
>>
>> > This is a feature request for the security wishlist. When upgrading
>> > package it would be good to show a diff between the new and old package
>> > files. Such an option could help performing review casually as part of
>> > the upgrade process and may improve the security of the package
>> > archives. More eyes would look at new package versions. This would make
>> > it harder to inject malicious code either via the source repository or
>> > via attacks on the package archives.
>>
>> That sounds like a good option to have!  I'll look into adding something
>> like this via a user option that adjusts how to confirm a package upgrade.
>>
>> Note that package-vc has something similar with the
>> `package-vc-log-incoming' command.
>>
>>
>>
>>