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net/tramp.el (tramp-ssh-controlmaster-options): Use "%C"

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Fixes: debbugs:19702

* net/tramp.el (tramp-ssh-controlmaster-options): Use "%C" for
ControlPath if possible.
This commit is contained in:
Michael Albinus 2015-02-02 10:16:04 +01:00
parent 43b82baa79
commit 50f3811883
2 changed files with 21 additions and 8 deletions
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5
lisp/ChangeLog
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@ -1,3 +1,8 @@
2015-02-02 Michael Albinus <michael.albinus@gmx.de>
* net/tramp.el (tramp-ssh-controlmaster-options): Use "%C" for
ControlPath if possible. (Bug#19702)
2015-02-02 Glenn Morris <rgm@gnu.org>
* emacs-lisp/authors.el (authors-obsolete-files-regexps)

24
lisp/net/tramp.el
View File

@ -311,17 +311,25 @@ useful only in combination with `tramp-default-proxies-alist'.")
(let ((result "")
(case-fold-search t))
(ignore-errors
(with-temp-buffer
(call-process "ssh" nil t nil "-o" "ControlMaster")
(goto-char (point-min))
(when (search-forward-regexp "missing.+argument" nil t)
(setq result "-o ControlPath=%t.%%r@%%h:%%p -o ControlMaster=auto")))
(unless (zerop (length result))
(when (executable-find "ssh")
(with-temp-buffer
(call-process "ssh" nil t nil "-o" "ControlPersist")
(call-process "ssh" nil t nil "-o" "ControlMaster")
(goto-char (point-min))
(when (search-forward-regexp "missing.+argument" nil t)
(setq result (concat result " -o ControlPersist=no"))))))
(setq result "-o ControlMaster=auto")))
(unless (zerop (length result))
(with-temp-buffer
(call-process
"ssh" nil t nil "-o" "ControlPath=%C" "host.does.not.exist")
(goto-char (point-min))
(if (search-forward-regexp "unknown.+key" nil t)
(setq result (concat result " -o ControlPath=%t.%%r@%%h:%%p"))
(setq result (concat result " -o ControlPath=%t.%%C"))))
(with-temp-buffer
(call-process "ssh" nil t nil "-o" "ControlPersist")
(goto-char (point-min))
(when (search-forward-regexp "missing.+argument" nil t)
(setq result (concat result " -o ControlPersist=no")))))))
result)
"Call ssh to detect whether it supports the Control* arguments.
Return a string to be used in `tramp-methods'.")