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(require 'tramp)
;; use ssh as transfer method
(setq tramp-default-method "ssh")
;; make sudo:remote-host work as expected
(add-to-list 'tramp-default-proxies-alist '(nil "\\`root\\'" "/ssh:%h:"))
(add-to-list 'tramp-default-proxies-alist
'((regexp-quote (system-name)) nil nil))
;; workaround for long ControlPath on darwin
;; https://trac.macports.org/ticket/29794
(when (eq system-type 'darwin)
(setq tramp-ssh-controlmaster-options
"-o ControlPath=/tmp/%%r@%%h:%%p -o ControlMaster=auto -o ControlPersist=no"))
(defun sudo-prefix-p (prefix)
"Return t if PREFIX is a sudo prefix."
(or (string-equal prefix "/sudo") (string-equal prefix "/sudo:")))
(defun ssh-prefix-p (prefix)
"Return t if PREFIX is a ssh prefix."
(string-equal prefix "/ssh"))
(defun sudo-file-name (filename)
"Return FILENAME with a sudo prefix.
If FILENAME already has a sudo prefix, do nothing. If FILENAME is
accessed over SSH, prefix it with \"/sudo:\". Otherwise, assume
FILENAME is a local path and prefix it with \"/sudo::\"."
(let* ((splitname (split-string filename ":"))
(prefix (car splitname))
(ssh-p (ssh-prefix-p prefix))
(sudo-p (sudo-prefix-p prefix)))
(if sudo-p
filename
(let ((sudo-prefix (if ssh-p "/sudo" "/sudo:"))
(components (if ssh-p (cdr splitname) splitname)))
(mapconcat 'identity (cons sudo-prefix components) ":")))))
(defun sudo-find-file (&optional arg)
"Find file and open it with sudo.
With a prefix ARG prompt edit currently visited file using sudo."
(interactive "P")
(if arg
(find-alternate-file (sudo-file-name buffer-file-name))
(find-file (sudo-file-name (ido-read-file-name "Find file with sudo: ")))))
(global-set-key (kbd "C-x +") 'sudo-find-file)
(global-set-key (kbd "C-x !") (lambda () (interactive) (sudo-find-file t)))
(provide 'init-tramp)
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