bug#54016: 29.0.50; TRAMP + sshfs says constantly that file changed

[Michael Albinus]

Ergus <spacibba@aol.com> writes:

Hi,

>>> Using tramp+sshfs it works pretty much fine at the beginning but after
>>> some minutes it interrupts constantly saying that the file changed on
>>> disk and asks for edit confirmation.
>>>
>>> By constantly I mean every time a new edit is attempt I get this (even
>>> several times consecutive).
>>>
>>> ```
>>> Saving file /sshfs:XXX:XXXX
>>> benchmarks_ompss.h has changed since visited or saved.  Save anyway? (y or 
>>> n) y
>>> benchmarks_ompss.h changed on disk; really edit the buffer? (y, n, r or 
>>> C-h) y
>>> File on disk now will become a backup file if you save these changes.
>>> Wrote /sshfs:XXX:XXXX
>>> ```
>>
>>Well, I would need a recipe to reproduce. Could you run it, when
>>tramp-verbose is set to 10? And please tell me at which time the problem
>>starts to appear, so I have a chance to find it in the debug buffer.
>>
>>I know that the debug buffer will be huge after a while, but there is no
>>problem if you send it directly to me (or a URL where I could find it).
>>
>
> 1) C-x C-f /sshfs:mn3:/home/ergus/cholesky_ompss2/cholesky_utils.c
> 2) edit and save (C-x C-f)
>
> 3) Try to edit again:
>
> and get the message:
>
> ```
> cholesky_utils.c changed on disk; really edit the buffer? (y, n, r or C-h) y
> File on disk now will become a backup file if you save these changes.
> ```
>
> While this is printed in the debug buffer.

Thanks for the recipe and the traces. Finally, I could reproduce the
problem locally, it was due to a missing update of the buffer's
modification time. The appended patch fixes this for me, could you pls
test?

Best regards, Michael.

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