GNU bug report logs -
#58446
28.2; file-attribute-device-number returns a cons cell instead of an integer
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Reported by: Thierry Volpiatto <thievol <at> posteo.net>
Date: Tue, 11 Oct 2022 18:18:02 UTC
Severity: normal
Found in version 28.2
Fixed in version 29.1
Done: Michael Albinus <michael.albinus <at> gmx.de>
Bug is archived. No further changes may be made.
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[Message part 1 (text/plain, inline)]
Your bug report
#58446: 28.2; file-attribute-device-number returns a cons cell instead of an integer
which was filed against the emacs package, has been closed.
The explanation is attached below, along with your original report.
If you require more details, please reply to 58446 <at> debbugs.gnu.org.
--
58446: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=58446
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems
[Message part 2 (message/rfc822, inline)]
Version: 29.1
Eli Zaretskii <eliz <at> 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.
[Message part 3 (message/rfc822, inline)]
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
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Memory information:
((conses 16 1834152 77310)
(symbols 48 43794 4)
(strings 32 346905 22367)
(string-bytes 1 12371838)
(vectors 16 89769)
(vector-slots 8 1894146 124249)
(floats 8 3996 656)
(intervals 56 347767 1990)
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<#secure method=pgpmime mode=sign>
--
Thierry
This bug report was last modified 2 years and 299 days ago.
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