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Subject: bug#48543: Feature request: put ELN cache in $XDG_CACHE_HOME by default
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Hi all,

By default the eln cache is stored in .emacs.d/eln-cache.  Would it make sense to store it in $XDG_CACHE_HOME/emacs/eln by default on platforms that obey the XDG spec?

I came across this because my backup scripts already exclude $XDG_CACHE_HOME, but didn't exclude .emacs.d/eln-cache, so I found myself backing up hundreds of megabytes of ELN files.

In a related Reddit discussion, https://www.reddit.com/r/emacs/comments/mltaie/gccemacs_how_to_permanently_change_where_elncache , Steve Purcell wrote:

> Now that emacs honours xdg settings for finding its own config, might it make sense for the eln cache to move to the xdg cache directory?

And Eli Zaretskii responded:

> I don't think so, personally: the XDG spec says the XDG cache directory should hold "user-specific non-essential (cached) data files". The *.eln files don't fit that description: the user would like the files to persist.
>
> That said, feel free to submit a feature-request bug report about this, and let's see what others think about this.

FWIW, I had a quick look through my .cache folder, and it seems that chromium and Firefox both put compiled code in that folder (JS bytecode and compiled Webassembly files).

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To: =?UTF-8?Q?Cl=C3=A9ment?= Pit-Claudel <cpitclaudel@HIDDEN>
Subject: bug#48543: Acknowledgement (Feature request: put ELN cache in
 $XDG_CACHE_HOME by default)
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Subject: bug#48543: Feature request: put ELN cache in $XDG_CACHE_HOME by default
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 Content preview:  =?UTF-8?Q?Cl=C3=A9ment?= Pit-Claudel <cpitclaudel@HIDDEN> writes: > By
   default the eln cache is stored in .emacs.d/eln-cache. Would it > make sense
    to store it in $XDG_CACHE_HOME/emacs/eln by default on > platforms that obey
    the XDG spec? 
 
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Cl=C3=A9ment Pit-Claudel <cpitclaudel@HIDDEN> writes:

> By default the eln cache is stored in .emacs.d/eln-cache.  Would it
> make sense to store it in $XDG_CACHE_HOME/emacs/eln by default on
> platforms that obey the XDG spec?

I think that makes sense.  Perhaps Andrea has some comments; added to
the CCs.

> And Eli Zaretskii responded:
>
>> I don't think so, personally: the XDG spec says the XDG cache
>> directory should hold "user-specific non-essential (cached) data
>> files". The *.eln files don't fit that description: the user would
>> like the files to persist.
>>
>> That said, feel free to submit a feature-request bug report about
>> this, and let's see what others think about this.
>
> FWIW, I had a quick look through my .cache folder, and it seems that
> chromium and Firefox both put compiled code in that folder (JS
> bytecode and compiled Webassembly files).

Since the .eln files are cached data, it seems like the right place to
put them.  Of course the user would like all (non-stale) cached data to
persist.

--=20
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

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Subject: bug#48543: Feature request: put ELN cache in $XDG_CACHE_HOME by default
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Date: Wed, 13 Jul 2022 15:42:52 +0300
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From: Eli Zaretskii <eliz@HIDDEN>
In-Reply-To: <875yk1qko7.fsf@HIDDEN> (message from Lars Ingebrigtsen on Wed, 
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> Cc: 48543 <at> debbugs.gnu.org, Andrea Corallo <akrl@HIDDEN>
> From: Lars Ingebrigtsen <larsi@HIDDEN>
> Date: Wed, 13 Jul 2022 14:08:56 +0200
> 
> >> I don't think so, personally: the XDG spec says the XDG cache
> >> directory should hold "user-specific non-essential (cached) data
> >> files". The *.eln files don't fit that description: the user would
> >> like the files to persist.
> >>
> >> That said, feel free to submit a feature-request bug report about
> >> this, and let's see what others think about this.
> >
> > FWIW, I had a quick look through my .cache folder, and it seems that
> > chromium and Firefox both put compiled code in that folder (JS
> > bytecode and compiled Webassembly files).
> 
> Since the .eln files are cached data, it seems like the right place to
> put them.  Of course the user would like all (non-stale) cached data to
> persist.

So we prefer to hear more complaints about Emacs being slow to start
because the eln-cache was purged?  Don't forget that the XDG
directories can disappear without a warning.

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 Content preview:  Eli Zaretskii <eliz@HIDDEN> writes: >> > FWIW, I had a quick
 look through my .cache folder, and it seems that >> > chromium and Firefox
 both put compiled code in that folder (JS >> > bytecode and compiled
 Webassembly files). >> >> Since [...] 
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Eli Zaretskii <eliz@HIDDEN> writes:

>> > FWIW, I had a quick look through my .cache folder, and it seems that
>> > chromium and Firefox both put compiled code in that folder (JS
>> > bytecode and compiled Webassembly files).
>> 
>> Since the .eln files are cached data, it seems like the right place to
>> put them.  Of course the user would like all (non-stale) cached data to
>> persist.
>
> So we prefer to hear more complaints about Emacs being slow to start
> because the eln-cache was purged?  Don't forget that the XDG
> directories can disappear without a warning.

This doesn't seem to worry the Chromium etc people, so I don't think it
should worry us.  

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

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