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bug#58446: closed (28.2; file-attribute-device-number returns a cons cel


From: GNU bug Tracking System
Subject: bug#58446: closed (28.2; file-attribute-device-number returns a cons cell instead of an integer)
Date: Thu, 13 Oct 2022 19:17:03 +0000

Your message dated Thu, 13 Oct 2022 21:16:48 +0200
with message-id <87o7ufzg7z.fsf@gmx.de>
and subject line Re: bug#58446: 28.2; file-attribute-device-number returns a 
cons cell instead of an integer
has caused the debbugs.gnu.org bug report #58446,
regarding 28.2; file-attribute-device-number returns a cons cell instead of an 
integer
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs@gnu.org.)


-- 
58446: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=58446
GNU Bug Tracking System
Contact help-debbugs@gnu.org with problems
--- Begin Message --- Subject: 28.2; file-attribute-device-number returns a cons cell instead of an integer Date: Tue, 11 Oct 2022 18:11:18 +0000
The device-number in file-attributes (nth 11) is a cons cell when called
on remote files (see tramp-get-device).
It would be great to notify this in Emacs documentation and how to
interpret this value e.g. (-1 . 1).
I noticed this in fixing a bug in dired-async.el, the code was using `=`
to compare the two values which is legitimate according to docstring.


In GNU Emacs 28.2 (build 1, x86_64-pc-linux-gnu, Motif Version 2.3.8, cairo 
version 1.16.0)
 of 2022-09-12 built on IPad-S340
Windowing system distributor 'The X.Org Foundation', version 11.0.12013000
System Description: Linux Mint 20.3

Configured using:
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Configured features:
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PDUMPER PNG RSVG SECCOMP SOUND THREADS TIFF TOOLKIT_SCROLL_BARS X11 XDBE
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Major mode: ƐĽ

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Memory information:
((conses 16 1834152 77310)
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 (strings 32 346905 22367)
 (string-bytes 1 12371838)
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<#secure method=pgpmime mode=sign>

-- 
Thierry



--- End Message ---
--- Begin Message --- Subject: Re: bug#58446: 28.2; file-attribute-device-number returns a cons cell instead of an integer Date: Thu, 13 Oct 2022 21:16:48 +0200 User-agent: Gnus/5.13 (Gnus v5.13) Emacs/29.0.50 (gnu/linux)
Version: 29.1

Eli Zaretskii <eliz@gnu.org> writes:

>> But if we haven't needed that until now, we're probably not going to
>> need it going forward, and we should just document the current status
>> quo.
>>
>> > And perhaps we could even add a helper function to extract the
>> > information for a file's uniqueness:
>> >
>> > (defsubst file-attribute-file-number (attributes)
>> >   "The inode and device numbers in ATTRIBUTES returned by 
>> > `file-attributes'.
>> > It can be used to determine whether two files are identical."
>> >   (nthcdr 10 attributes))
>> >
>> > WDYT?
>>
>> Makes sense to me.
>
> Agreed.

Pushed to master. Closing the bug.

Best regards, Michael.


--- End Message ---

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