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

[Philip Kaludercic <philipk@posteo.net>]

Eli Zaretskii <eliz@gnu.org> writes:

>> From: João Távora <joaotavora@gmail.com>
>> Cc: philipk@posteo.net,  monnier@iro.umontreal.ca,  larsi@gnus.org,
>>   62720@debbugs.gnu.org
>> Date: Wed, 12 Apr 2023 10:18:08 +0100
>> 
>> Eli Zaretskii <eliz@gnu.org> writes:
>> 
>> >>  Btw, why, when I do "M-x list-packages RET", I see Eglot in red with
>> >>  Status "incompat"?  If I press RET on its name, I see
>> >> 
>> >>    Package eglot is incompatible.
>> >> 
>> >>         Status: Incompatible because it depends on uninstallable packages.
>> >> 
>> >>  Why is that?
>> >> 
>> >> No idea. Is this with our without my patch?
>> >
>> > Without.
>> 
>> I can't reproduce this in a recent emacs-29.  Here's what I start Emacs
>> with
>> 
>> HOME=`mktemp -d` && src/emacs -Q -f list-packages
>> 
>> I get:
>> 
>>      Status: Available from gnu -- [Install]
>
> I did just
>
>   emacs -Q
>   M-x list-packages RET
>
> and I still see what I described.
>
> I get the same if I point HOME to a scratch empty directory.
>
> Maybe it's a Windows thing? why are some dependencies marked as "not
> available"?
>
>   Package eglot is incompatible.
>
>        Status: Incompatible because it depends on uninstallable packages.
>       Archive: gnu
>       Version: 1.14
>        Commit: 8125d4cfc5605ead9102b7d823c4241029eb76cc
>       Summary: The Emacs Client for LSP servers
>      Requires: emacs-26.3, jsonrpc-1.0.16, flymake-1.2.1,
> 		 project-0.9.8 (not available), xref-1.6.2 (not available),
> 		 eldoc-1.14.0, seq-2.23 (not available),
> 		 external-completion-0.1 (not available)

On GNU/Linux: I have experienced a similar issue to this one in the
past, but found that it resolved itself without any action on my end
after a while.  Sadly I did not take the time to investigate what is
going on, but I believe that this is a subtle bug in package.el.