bug#33005: 27.0.50; Data loss with Gnus registry

[Eric Abrahamsen]

Michael Heerdegen <michael_heerdegen@web.de> writes:

> Eric Abrahamsen <eric@ericabrahamsen.net> writes:
>
>> > I didn't think long about it but instead I had a look how other packages
>> > handle the case.
>>
>> Good enough for me! Thanks.
>
> Do you really want this to be nil when the file buffer is evaluated?
>
> (defconst gnus-mock-data-dir
>   (when load-file-name
>     (file-name-as-directory (expand-file-name
>                            "data"
>                            (file-name-directory load-file-name))))
>   "Source directory for Gnus mock data.")
>
> Then again I need additional work when loading the source to debug.  You
> could at least accept `default-directory' when it contains a "data"
> named directory, or query for a directory with a useful default instead
> of barfing when gnus-mock-start is called.  With other words: what I get
> now is just another kind of barfing, no real improvement.

Oops, I didn't realize that default-directory would be set to the
containing directory at load time -- I assumed its chances of finding
the "data" directory correctly were essentially nil. I'll use your
version now...