It seems that file-exists-p sometimes requires
`tramp-cleanup-connection' to be executed in order for its return value
to be reliable. Specifically, if I create the file in a way that tramp
does not know about, then tramp may report that the file does not
exist when it does[1].
I am using
(if (file-remote-p default-directory)
(tramp-cleanup-connection default-directory))
to accomplish this cache flushing. Is it reasonable to pass the
connection as string to tramp-cleanup-connection like that? Or should I
create the argument in some different way? Or is there a different way
to ensure that file-exists-p reports the correct answer?
Thanks,
Dan
Footnotes:
[1] In testing I have done this by creating the file in a separate ssh
session, outside emacs. But the use case that I am working on involves
the file being created by an emacs comint process.
Here's my test code:
(defun user-create (&optional flush)
(let* ((default-directory "/davi...@oak.well.ox.ac.uk:")
(localname "/tmp/tramp-test")
(tmp-file (concat (file-remote-p default-directory) localname)))
(shell-command (format "rm -f %s" localname))
(tramp-cleanup-all-connections)
(insert "\n------------\n")
(insert (format "file is %s\n" tmp-file))
(insert (format "file exists?\t%S\n" (file-exists-p tmp-file)))
(insert (format "go create %s now!\n" tmp-file))
(sit-for 7)
(if flush (tramp-cleanup-connection default-directory))
(insert (format "file exists?\t%S\n" (file-exists-p tmp-file)))
(insert "------------\n")))
(user-create)
------------
file is /scp:davi...@oak.well.ox.ac.uk:/tmp/tramp-test
file exists? nil
go create /scp:davi...@oak.well.ox.ac.uk:/tmp/tramp-test now!
file exists? nil
------------
(user-create 'flush)
------------
file is /scp:davi...@oak.well.ox.ac.uk:/tmp/tramp-test
file exists? nil
go create /scp:davi...@oak.well.ox.ac.uk:/tmp/tramp-test now!
file exists? t
------------
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