bug#50175: 28.0.50; tramp is hooked into C-x d (vc-dir) but not C-x = (vc-doff)

[Steingold <sds@gnu.org>]

Hi Ola, Lars, Dmitry,

> * Ola x Nilsson <byn.k.avyffba@nkvf.pbz> [2021-08-25 15:26:34 +0200]:
>
> On Mon, Aug 23 2021, Steingold wrote:
>
>> when editing a remote file, vc-dir shows the *vc-dir* buffer correctly,
>> but vc-diff in the same buffer fails:
>>
>> Debugger entered--Lisp error: (error "Failed (status 128): git --no-pager diff-index --exit-code
>> -p HEAD -- :(literal)/scp:remote:/path/file.py")
>>   signal(error ("Failed (status 128): git --no-pager diff-index --exit-code -p HEAD --
>> :(literal)/scp:remote:/path/file.py"))
>>   error("Failed (%s): %s" "status 128" "git --no-pager diff-index --exit-code -p HEAD --
>> :(literal)/scp:remote:/path/file.py")
>>   vc-do-command("*vc-diff*" 1 "git" (":(literal)/scp:remote:/path/file.py") "--no-pager"
>> "diff-index" "--exit-code" "-p" "HEAD" nil "--")
>>   apply(vc-do-command "*vc-diff*" 1 "git" (":(literal)/scp:remote:/path/file.py") ("--no-pager"
>> "diff-index" "--exit-code" "-p" "HEAD" nil "--"))
>>   vc-git-command("*vc-diff*" 1 (":(literal)/scp:remote:/path/file.py") "diff-index" "--exit-code"
>> "-p" "HEAD" nil "--")
>>   apply(vc-git-command "*vc-diff*" 1 (":(literal)/scp:remote:/path/file.py") "diff-index"
>> "--exit-code" ("-p" "HEAD" nil "--"))
>>   vc-git-diff(("/scp:remote:/path/file.py") nil nil "*vc-diff*" t)
>>   apply(vc-git-diff (("/scp:remote:/path/file.py") nil nil "*vc-diff*" t))
>>   vc-call-backend(Git diff ("/scp:remote:/path/file.py") nil nil "*vc-diff*" t)
>>   vc-diff-internal(t (Git ("/scp:remote:/path/file.py")) nil nil t)
>>   vc-diff(nil t)
>>   funcall-interactively(vc-diff nil t)
>>   call-interactively(vc-diff nil nil)
>>   command-execute(vc-diff)
>>
>> Same error on = (vc-diff) in the *vc-dir* buffer.
>>
>> I am pretty sure this is a regression from about 2-3 weeks ago.
>>
>> (vc-next-action also fails)
>
> This is the result of the git literal pathspec prefix being added in a
> non-tramp-aware way.  See bug #39452.  The commits in question are
>
> 3502321403 Fix regressions in the last change
> 3572613550 Fix vc-git-state for filenames with wildcards

I do have all these patches, but, alas, I still see the bug.
https://debbugs.gnu.org/cgi/bugreport.cgi?bug=39452
has no messages for 10 days, I hope it is being worked on...

Thank you!

-- 
Sam Steingold (http://sds.podval.org/) on darwin Ns 10.3.1894
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