GNU bug report logs - #48543
Feature request: put ELN cache in $XDG_CACHE_HOME by default

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Package: emacs; Severity: wishlist; Reported by: Clément Pit-Claudel <cpitclaudel@HIDDEN>; dated Thu, 20 May 2021 17:26:02 UTC; Maintainer for emacs is bug-gnu-emacs@HIDDEN.

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From: Lars Ingebrigtsen <larsi@HIDDEN>
To: Eli Zaretskii <eliz@HIDDEN>
Subject: Re: bug#48543: Feature request: put ELN cache in $XDG_CACHE_HOME by
 default
In-Reply-To: <834jzlw5df.fsf@HIDDEN> (Eli Zaretskii's message of "Wed, 13 Jul
 2022 15:42:52 +0300")
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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
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#48543; Package emacs. Full text available.

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Date: Wed, 13 Jul 2022 15:42:52 +0300
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From: Eli Zaretskii <eliz@HIDDEN>
To: Lars Ingebrigtsen <larsi@HIDDEN>
In-Reply-To: <875yk1qko7.fsf@HIDDEN> (message from Lars Ingebrigtsen on Wed, 
 13 Jul 2022 14:08:56 +0200)
Subject: Re: bug#48543: Feature request: put ELN cache in $XDG_CACHE_HOME by
 default
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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.
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#48543; Package emacs. Full text available.

Message received at 48543 <at> debbugs.gnu.org:


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To: =?utf-8?Q?Cl=C3=A9ment?= Pit-Claudel <cpitclaudel@HIDDEN>
Subject: Re: bug#48543: Feature request: put ELN cache in $XDG_CACHE_HOME by
 default
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 (=?utf-8?Q?=22Cl=C3=A9ment?=
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 Content preview:  Clément 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
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#48543; Package emacs. Full text available.

Message received at submit <at> debbugs.gnu.org:


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From: =?UTF-8?Q?Cl=c3=a9ment_Pit-Claudel?= <cpitclaudel@HIDDEN>
To: bug-gnu-emacs <bug-gnu-emacs@HIDDEN>
Subject: 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).
Acknowledgement sent to Clément Pit-Claudel <cpitclaudel@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-gnu-emacs@HIDDEN. Full text available.
Report forwarded to bug-gnu-emacs@HIDDEN:
bug#48543; Package emacs. Full text available.
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