bug#40156: 26.3; append-to-file does not work on nonexistent file over ssh

[Michael Albinus]

Version: 27.2

Sean Devlin <spd@toadstyle.org> writes:

> Hi folks,

Hi Sean,

> I did a little digging, and I think the problem is in
> tramp-sh-handle-write-region around line 3240:
>
>>        ;; If `append' is non-nil, we copy the file locally, and let
>>        ;; the native `write-region' implementation do the job.
>>        (when append (copy-file filename tmpfile 'ok))
>
> It looks like copy-file fails if filename doesn’t exist. Adding a test
> for file existence (i.e. file-exists-p) to the condition seems to
> solve the problem, though admittedly I only tested for my own narrow
> use case.

Thanks, and yes, your analysis is correct. I've committed a respective
patch to Emacs master. I've extended also tramp-tests.el
accordingly. The patch is appended.

Since Emacs 27.1 is already in pretest, I haven't applied it there. The
next Tramp release in GNU ELPA, 2.4.3.3, will contain the patch. It is
expected end of March.

> Thanks!

Best regards, Michael.

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