* bug#58446: 28.2; file-attribute-device-number returns a cons cell instead of an integer
@ 2022-10-11 18:11 Thierry Volpiatto
2022-10-12 11:13 ` Lars Ingebrigtsen
0 siblings, 1 reply; 12+ messages in thread
From: Thierry Volpiatto @ 2022-10-11 18:11 UTC (permalink / raw)
To: 58446
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.
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--
Thierry
^ permalink raw reply [flat|nested] 12+ messages in thread
* bug#58446: 28.2; file-attribute-device-number returns a cons cell instead of an integer
2022-10-11 18:11 bug#58446: 28.2; file-attribute-device-number returns a cons cell instead of an integer Thierry Volpiatto
@ 2022-10-12 11:13 ` Lars Ingebrigtsen
2022-10-12 14:57 ` Michael Albinus
0 siblings, 1 reply; 12+ messages in thread
From: Lars Ingebrigtsen @ 2022-10-12 11:13 UTC (permalink / raw)
To: Thierry Volpiatto; +Cc: Michael Albinus, 58446
Thierry Volpiatto <thievol@posteo.net> writes:
> 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.
Hm... would it be possible for Tramp to stash that information
somewhere else? It is (as you say) documented to be a number.
^ permalink raw reply [flat|nested] 12+ messages in thread
* bug#58446: 28.2; file-attribute-device-number returns a cons cell instead of an integer
2022-10-12 11:13 ` Lars Ingebrigtsen
@ 2022-10-12 14:57 ` Michael Albinus
2022-10-13 6:31 ` Lars Ingebrigtsen
2022-10-14 17:04 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
0 siblings, 2 replies; 12+ messages in thread
From: Michael Albinus @ 2022-10-12 14:57 UTC (permalink / raw)
To: Lars Ingebrigtsen; +Cc: Thierry Volpiatto, 58446
Lars Ingebrigtsen <larsi@gnus.org> writes:
Hi Lars,
>> 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.
>
> Hm... would it be possible for Tramp to stash that information
> somewhere else? It is (as you say) documented to be a number.
Yes, Tramp is out of the documented API in this case. And no, it cannot
be kept somewhere else.
Inodes are unique only on the given file system. That's why there are
device numbers, which identify a file system.
A remote file is not related to any (local) file system. That's why
ange-ftp returns -1 as device-number, always. This is good enough for
practical purposes, because it is different to any device number of a
file system visible on the local host. For the inode number, ange-ftp
uses a "virtual" one, which means for every accessed file it increases
its internal counter. By this, all files accessed by ange-ftp are
regarded as different if they differ in the remote file name, even if
they are equal.
Tramp did inherit this approach from ange-ftp, with the difference that
it uses virtual inode numbers only in case it couldn't determine the
real inode number. It has its own counter for virtual inode numbers,
divided from ange-ftp.
This had several problems. The device number of all connected remote
devices, be it via any Tramp method or via ange-ftp, was always the
same. Remote files were regarded as equal if just the inode number was
the same, be it a real inode number or a virtual number.
Therefore, in January 2003 (almost 20 years ago :-) the device number in
Tramp has changed. It is now a cons cell (-1 . REMOTE), with REMOTE
being a virtual device number generated by Tramp for very connection.
By this, the tupel (inode, device) still identifies a file uniquely,
being it local or remote.
As said, this change happend almost 20 years ago. Device numbers are
usually ignored by Emacs and external packages, I don't remember a
problem report for this over the years. Emacs core creates the
buffer-local variable buffer-file-number, which is indeed (INODE
DEVNUM). See basic-save-buffer:
(setq buffer-file-number
(nthcdr 10 (file-attributes buffer-file-name)))
And this variable is used for checking whether two files are equal, see
find-buffer-visiting:
(equal buffer-file-number number)
That's why it works also with Tramp's interpretation of device
numbers. And again, w/o blame over the years.
I tend to agree with Thierry: we shall document the status quo,
i.e. device numbers can be more than just an integer, and should be
compared via equal. The details of that structure don't matter I
believe.
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?
Best regards, Michael.
^ permalink raw reply [flat|nested] 12+ messages in thread
* bug#58446: 28.2; file-attribute-device-number returns a cons cell instead of an integer
2022-10-12 14:57 ` Michael Albinus
@ 2022-10-13 6:31 ` Lars Ingebrigtsen
2022-10-13 7:09 ` Eli Zaretskii
2022-10-14 17:04 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
1 sibling, 1 reply; 12+ messages in thread
From: Lars Ingebrigtsen @ 2022-10-13 6:31 UTC (permalink / raw)
To: Michael Albinus; +Cc: Thierry Volpiatto, 58446
Michael Albinus <michael.albinus@gmx.de> writes:
[explanation snipped]
> As said, this change happend almost 20 years ago. Device numbers are
> usually ignored by Emacs and external packages, I don't remember a
> problem report for this over the years. Emacs core creates the
> buffer-local variable buffer-file-number, which is indeed (INODE
> DEVNUM). See basic-save-buffer:
>
> (setq buffer-file-number
> (nthcdr 10 (file-attributes buffer-file-name)))
>
> And this variable is used for checking whether two files are equal, see
> find-buffer-visiting:
>
> (equal buffer-file-number number)
>
> That's why it works also with Tramp's interpretation of device
> numbers. And again, w/o blame over the years.
Yes, I agree -- we should probably just document this. But I was
wondering whether it would be useful to make the `file-attribute'
structure extendable? We could have a twelfth (optional) element that
could be an plist of properties, and then we'd have a place to stash
stuff.
(That might break stuff, though.)
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.
^ permalink raw reply [flat|nested] 12+ messages in thread
* bug#58446: 28.2; file-attribute-device-number returns a cons cell instead of an integer
2022-10-13 6:31 ` Lars Ingebrigtsen
@ 2022-10-13 7:09 ` Eli Zaretskii
2022-10-13 19:16 ` Michael Albinus
0 siblings, 1 reply; 12+ messages in thread
From: Eli Zaretskii @ 2022-10-13 7:09 UTC (permalink / raw)
To: Lars Ingebrigtsen; +Cc: thievol, 58446, michael.albinus
> Cc: Thierry Volpiatto <thievol@posteo.net>, 58446@debbugs.gnu.org
> From: Lars Ingebrigtsen <larsi@gnus.org>
> Date: Thu, 13 Oct 2022 08:31:06 +0200
>
> Michael Albinus <michael.albinus@gmx.de> 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.
^ permalink raw reply [flat|nested] 12+ messages in thread
* bug#58446: 28.2; file-attribute-device-number returns a cons cell instead of an integer
2022-10-13 7:09 ` Eli Zaretskii
@ 2022-10-13 19:16 ` Michael Albinus
0 siblings, 0 replies; 12+ messages in thread
From: Michael Albinus @ 2022-10-13 19:16 UTC (permalink / raw)
To: Eli Zaretskii; +Cc: thievol, Lars Ingebrigtsen, 58446-done
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.
^ permalink raw reply [flat|nested] 12+ messages in thread
* bug#58446: 28.2; file-attribute-device-number returns a cons cell instead of an integer
2022-10-12 14:57 ` Michael Albinus
2022-10-13 6:31 ` Lars Ingebrigtsen
@ 2022-10-14 17:04 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-10-14 17:28 ` Michael Albinus
1 sibling, 1 reply; 12+ messages in thread
From: Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors @ 2022-10-14 17:04 UTC (permalink / raw)
To: Michael Albinus; +Cc: Thierry Volpiatto, Lars Ingebrigtsen, 58446
> (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?
Sounds good, except:
- The name `file-attribute-file-number` doesn't sound right
because it doesn't return a number.
- I wouldn't use `defsubst` (so it can more easily be modified in the
future, e.g. in case we add more fields to the attributes or use some
other representation for attributes).
- I would document it more abstractly, mentioning inode and device
number only as *examples* of things it might contain.
Stefan
^ permalink raw reply [flat|nested] 12+ messages in thread
* bug#58446: 28.2; file-attribute-device-number returns a cons cell instead of an integer
2022-10-14 17:04 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
@ 2022-10-14 17:28 ` Michael Albinus
2022-10-14 18:34 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
0 siblings, 1 reply; 12+ messages in thread
From: Michael Albinus @ 2022-10-14 17:28 UTC (permalink / raw)
To: Stefan Monnier; +Cc: Thierry Volpiatto, Lars Ingebrigtsen, 58446
Stefan Monnier <monnier@iro.umontreal.ca> writes:
Hi Stefan,
>> (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?
>
> Sounds good, except:
>
> - The name `file-attribute-file-number` doesn't sound right
> because it doesn't return a number.
The name is a reminiscence of the existing variable buffer-file-number,
which serves exactly the same purpose.
> - I wouldn't use `defsubst` (so it can more easily be modified in the
> future, e.g. in case we add more fields to the attributes or use some
> other representation for attributes).
All other accessor functions for file-attributes are defsubsts.
> - I would document it more abstractly, mentioning inode and device
> number only as *examples* of things it might contain.
There is no intention to use it for anything else. It shall return
(nthcdr 10 attributes) like all the other file-attributes accessor
functions return for the respective slots.
> Stefan
Best regards, Michael.
^ permalink raw reply [flat|nested] 12+ messages in thread
* bug#58446: 28.2; file-attribute-device-number returns a cons cell instead of an integer
2022-10-14 17:28 ` Michael Albinus
@ 2022-10-14 18:34 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-10-14 19:03 ` Michael Albinus
0 siblings, 1 reply; 12+ messages in thread
From: Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors @ 2022-10-14 18:34 UTC (permalink / raw)
To: Michael Albinus; +Cc: Thierry Volpiatto, Lars Ingebrigtsen, 58446
>> - The name `file-attribute-file-number` doesn't sound right
>> because it doesn't return a number.
> The name is a reminiscence of the existing variable buffer-file-number,
> which serves exactly the same purpose.
One error doesn't justify another.
Maybe a better name would be "file identifier"?
>> - I wouldn't use `defsubst` (so it can more easily be modified in the
>> future, e.g. in case we add more fields to the attributes or use some
>> other representation for attributes).
> All other accessor functions for file-attributes are defsubsts.
Every `defsubst` should be judged on its own individual value.
This one doesn't seem to be justified.
>> - I would document it more abstractly, mentioning inode and device
>> number only as *examples* of things it might contain.
> There is no intention to use it for anything else. It shall return
> (nthcdr 10 attributes) like all the other file-attributes accessor
> functions return for the respective slots.
I did not suggest changing its implementation. Only its documentation.
The doc should describe the intended semantics of the return value
without documenting how it's implemented.
Stefan
^ permalink raw reply [flat|nested] 12+ messages in thread
* bug#58446: 28.2; file-attribute-device-number returns a cons cell instead of an integer
2022-10-14 18:34 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
@ 2022-10-14 19:03 ` Michael Albinus
2022-10-14 19:14 ` Eli Zaretskii
0 siblings, 1 reply; 12+ messages in thread
From: Michael Albinus @ 2022-10-14 19:03 UTC (permalink / raw)
To: Stefan Monnier; +Cc: Thierry Volpiatto, Lars Ingebrigtsen, 58446
Stefan Monnier <monnier@iro.umontreal.ca> writes:
Hi Stefan,
>>> - The name `file-attribute-file-number` doesn't sound right
>>> because it doesn't return a number.
>> The name is a reminiscence of the existing variable buffer-file-number,
>> which serves exactly the same purpose.
>
> One error doesn't justify another.
> Maybe a better name would be "file identifier"?
True, but I'd let decide the maintainers.
>>> - I wouldn't use `defsubst` (so it can more easily be modified in the
>>> future, e.g. in case we add more fields to the attributes or use some
>>> other representation for attributes).
>> All other accessor functions for file-attributes are defsubsts.
>
> Every `defsubst` should be judged on its own individual value.
> This one doesn't seem to be justified.
As I said, it should be an "accessor function" for the result of
file-attributes. Just a stupid one, which returns inode and
device. That's the intention, and not something more sophisticated about
identifying a file.
>>> - I would document it more abstractly, mentioning inode and device
>>> number only as *examples* of things it might contain.
>> There is no intention to use it for anything else. It shall return
>> (nthcdr 10 attributes) like all the other file-attributes accessor
>> functions return for the respective slots.
>
> I did not suggest changing its implementation. Only its documentation.
> The doc should describe the intended semantics of the return value
> without documenting how it's implemented.
The intended semantics is what's described. I understand that you see
something more for the future. I don't see it, sorry. No other use case
I could think of.
We have file-equal-p for more sophisticated checks, and this has even
file name handler support.
> Stefan
Best regards, Michael.
^ permalink raw reply [flat|nested] 12+ messages in thread
* bug#58446: 28.2; file-attribute-device-number returns a cons cell instead of an integer
2022-10-14 19:03 ` Michael Albinus
@ 2022-10-14 19:14 ` Eli Zaretskii
2022-10-14 19:33 ` Michael Albinus
0 siblings, 1 reply; 12+ messages in thread
From: Eli Zaretskii @ 2022-10-14 19:14 UTC (permalink / raw)
To: Michael Albinus; +Cc: thievol, larsi, 58446, monnier
> Cc: Thierry Volpiatto <thievol@posteo.net>, Lars Ingebrigtsen <larsi@gnus.org>,
> 58446@debbugs.gnu.org
> From: Michael Albinus <michael.albinus@gmx.de>
> Date: Fri, 14 Oct 2022 21:03:15 +0200
>
> Stefan Monnier <monnier@iro.umontreal.ca> writes:
>
> Hi Stefan,
>
> >>> - The name `file-attribute-file-number` doesn't sound right
> >>> because it doesn't return a number.
> >> The name is a reminiscence of the existing variable buffer-file-number,
> >> which serves exactly the same purpose.
> >
> > One error doesn't justify another.
> > Maybe a better name would be "file identifier"?
>
> True, but I'd let decide the maintainers.
It would be better, yes. I already changed "device number" to eithe
just "device" or "device identifier", in the documentation you touched
today, since talking about "device number" when it can be a cons of 2
numbers doesn't sound like a good idea.
^ permalink raw reply [flat|nested] 12+ messages in thread
* bug#58446: 28.2; file-attribute-device-number returns a cons cell instead of an integer
2022-10-14 19:14 ` Eli Zaretskii
@ 2022-10-14 19:33 ` Michael Albinus
0 siblings, 0 replies; 12+ messages in thread
From: Michael Albinus @ 2022-10-14 19:33 UTC (permalink / raw)
To: Eli Zaretskii; +Cc: thievol, larsi, 58446, monnier
Eli Zaretskii <eliz@gnu.org> writes:
Hi Eli,
> It would be better, yes. I already changed "device number" to eithe
> just "device" or "device identifier", in the documentation you touched
> today, since talking about "device number" when it can be a cons of 2
> numbers doesn't sound like a good idea.
I've changed the name to file-attribute-file-identifier. Pushed to master.
Best regards, Michael.
^ permalink raw reply [flat|nested] 12+ messages in thread
end of thread, other threads:[~2022-10-14 19:33 UTC | newest]
Thread overview: 12+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2022-10-11 18:11 bug#58446: 28.2; file-attribute-device-number returns a cons cell instead of an integer Thierry Volpiatto
2022-10-12 11:13 ` Lars Ingebrigtsen
2022-10-12 14:57 ` Michael Albinus
2022-10-13 6:31 ` Lars Ingebrigtsen
2022-10-13 7:09 ` Eli Zaretskii
2022-10-13 19:16 ` Michael Albinus
2022-10-14 17:04 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-10-14 17:28 ` Michael Albinus
2022-10-14 18:34 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-10-14 19:03 ` Michael Albinus
2022-10-14 19:14 ` Eli Zaretskii
2022-10-14 19:33 ` Michael Albinus
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