Philipp Stephani <p.stephani2@gmail.com> writes:

Hi Philipp,

> $ mkdir -p /tmp/tramptest && emacs -Q -batch -l tramp-sshfs -l tramp -eval '(let ((default-directory "/sshfs:localhost:/tmp/tramptest/"))
>   (write-region "hello" nil "input")
>   (with-temp-buffer
>     (print (list (process-file "cat" "input" t)
>                  (buffer-string)))))'
>
> (1 "")
>
> I think the problem is that tramp-sshfs-handle-process-file doesn't pass
> the correct input file to tramp-call-process; it should first expand the
> input file against the remote default directory and then copy it locally
> to pass it to the SSH process.

Could you pls try the appended patch?

Best regards, Michael.