/sudo:<user>@172.0.0.1:/<file> works, /sudo:<user>@localhost:/<file> doesn't

[Gilles Pion]

[tramp version 2.1.12]
I think there is  somewhere a too much optimistic assumption regarding short
tracks taken when tramp-local-host-p is true

Probably around "tramp-handle-insert-file-contents" or in one of the
functions it calls 

Evidence: 
By using "/sudo:<user>@localhost:/<file>" I get en empty buffer and
"Permission denied" errors in tramp buffer, when using 127.0.0.1 instead,
everything works ok,

partial debug buffer contents:

///da7bc880997545f34eca93bb29ecfa4d
14:43:16 tramp-get-connection-property (7) # process-buffer nil
14:43:16 tramp-get-connection-property (7) # process-name nil
14:43:16 tramp-get-connection-property (7) # last-cmd-time (18325 62196
736502)
14:43:16 tramp-get-connection-property (7) # process-name nil
14:43:16 tramp-get-connection-property (7) # remote-echo nil
14:43:16 tramp-send-command (6) # cp -f /home/getlogs/.profile
/tmp/U501680/tramp.303186uYe
14:43:16 tramp-get-connection-property (7) # process-name nil
14:43:16 tramp-get-connection-property (7) # chunksize 0
14:43:16 tramp-set-connection-property (7) # last-cmd-time (18325 62196
770147)
14:43:16 tramp-get-connection-property (7) # process-buffer nil
14:43:16 tramp-get-connection-property (7) # check-remote-echo nil
14:43:16 tramp-get-connection-property (7) # check-remote-echo nil
14:43:16 tramp-get-connection-property (7) # check-remote-echo nil
14:43:16 tramp-get-connection-property (7) # check-remote-echo nil
14:43:16 tramp-get-connection-property (7) # check-remote-echo nil
14:43:16 tramp-get-connection-property (7) # check-remote-echo nil
14:43:16 tramp-wait-for-regexp (6) # 
cp: /tmp/U501680/tramp.303186uYe: Permission denied


I've made a temporary (and ugly) fix by adding those lines to dot-emacs:

(require 'tramp)

(defun tramp-local-host-p (vec) nil )


-----
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Gilles
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