bug#62720: 29.0.60; Not easy at all to upgrade :core packages like Eglot

[Philip Kaludercic]

Eli Zaretskii <eliz@gnu.org> writes:

>> From: Philip Kaludercic <philipk@posteo.net>
>> Cc: joaotavora@gmail.com,  monnier@iro.umontreal.ca,  62720@debbugs.gnu.org,
>>   larsi@gnus.org
>> Date: Thu, 13 Apr 2023 15:10:01 +0000
>> 
>> Eli Zaretskii <eliz@gnu.org> writes:
>> 
>> >> The issue here is that this breaks the non-interactive invocations like
>> >> (package-install 'eglot), unless they invoke the function while binding
>> >> `current-prefix-arg', which I don't think is a common practice.
>> >
>> > Then let's add another optional argument, and let prefix arg set it.
>> > Would that resolve this issue?
>> 
>> That could solve it, but a user option might be more elegant.  We could
>> set it to nil for now, and change it to non-nil for the next release.
>
> Adding an option is fine by me, as long as its default preserves
> previous behavior.
>
> Just to be sure we are on the same page: you suggest _both_ prefix
> argument and user option, where user option could be used to avoid the
> need for prefix argument?

I was thinking about both, but I supposed that a user option would be
enough.

>> >> >> Note that (package-install 'eglot) does download code, but I believe
>> >> >> that this is the correct approach and would align with what João
>> >> >> wanted.
>> >> >
>> >> > I'm not sure I follow: which code does the above download?
>> >> 
>> >> I did not change any of the code that downloads anything, all this does
>> >> is prompt the user for built-in packages when invoked interactively with
>> >> a prefix argument and if package-install is invoked with a built-in
>> >> package, then it will switch to the ELPA version.  This will not happen
>> >> in interactive usage, since `completing-read' is called with
>> >> REQUIRE-MATCH.
>> >
>> > So you are saying that non-interactive calls to package-install could
>> > install Eglot from ELPA even without the changes, is that right?
>> 
>> No, my proposed diff changes what package decides to download (the
>> planning phase), but doesn't touch anything after that.  The current
>> state is that (package-install 'eglot) just prints
>> 
>>   ‘eglot’ is already installed
>
> And does nothing else?  You seem to be saying it still downloads
> something, but what is that?

No, it just prints that message but doesn't download anything.