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;;; em-tramp.el --- Eshell features that require TRAMP -*- lexical-binding:t -*-
;; Copyright (C) 1999-2019 Free Software Foundation, Inc.
;; Author: Aidan Gauland <aidalgol@no8wireless.co.nz>
;; This file is part of GNU Emacs.
;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
;;; Commentary:
;; Eshell features that require TRAMP.
;;; Code:
(require 'esh-util)
(eval-when-compile
(require 'esh-mode)
(require 'eshell)
(require 'tramp))
;; There are no items in this custom group, but eshell modules (ab)use
;; custom groups.
;;;###autoload
(progn
(defgroup eshell-tramp nil
"This module defines commands that use TRAMP in a way that is
not transparent to the user. So far, this includes only the
built-in su and sudo commands, which are not compatible with
the full, external su and sudo commands, and require the user
to understand how to use the TRAMP sudo method."
:tag "TRAMP Eshell features"
:group 'eshell-module))
(defun eshell-tramp-initialize ()
"Initialize the TRAMP-using commands code."
(when (eshell-using-module 'eshell-cmpl)
(add-hook 'pcomplete-try-first-hook
'eshell-complete-host-reference nil t))
(make-local-variable 'eshell-complex-commands)
(setq eshell-complex-commands
(append '("su" "sudo")
eshell-complex-commands)))
(autoload 'eshell-parse-command "esh-cmd")
(defun eshell/su (&rest args)
"Alias \"su\" to call TRAMP.
Uses the system su through TRAMP's su method."
(setq args (eshell-stringify-list (eshell-flatten-list args)))
(let ((orig-args (copy-tree args)))
(eshell-eval-using-options
"su" args
'((?h "help" nil nil "show this usage screen")
(?l "login" nil login "provide a login environment")
(? nil nil login "provide a login environment")
:usage "[- | -l | --login] [USER]
Become another USER during a login session.")
(throw 'eshell-replace-command
(let ((user "root")
(host (or (file-remote-p default-directory 'host)
"localhost"))
(dir (file-local-name (expand-file-name default-directory)))
(prefix (file-remote-p default-directory)))
(dolist (arg args)
(if (string-equal arg "-") (setq login t) (setq user arg)))
;; `eshell-eval-using-options' does not handle "-".
(if (member "-" orig-args) (setq login t))
(if login (setq dir "~/"))
(if (and prefix
(or
(not (string-equal
"su" (file-remote-p default-directory 'method)))
(not (string-equal
user (file-remote-p default-directory 'user)))))
(eshell-parse-command
"cd" (list (format "%s|su:%s@%s:%s"
(substring prefix 0 -1) user host dir)))
(eshell-parse-command
"cd" (list (format "/su:%s@%s:%s" user host dir)))))))))
(put 'eshell/su 'eshell-no-numeric-conversions t)
(defun eshell/sudo (&rest args)
"Alias \"sudo\" to call Tramp.
Uses the system sudo through TRAMP's sudo method."
(setq args (eshell-stringify-list (eshell-flatten-list args)))
(let ((orig-args (copy-tree args)))
(eshell-eval-using-options
"sudo" args
'((?h "help" nil nil "show this usage screen")
(?u "user" t user "execute a command as another USER")
:show-usage
:usage "[(-u | --user) USER] COMMAND
Execute a COMMAND as the superuser or another USER.")
(throw 'eshell-external
(let ((user (or user "root"))
(host (or (file-remote-p default-directory 'host)
"localhost"))
(dir (file-local-name (expand-file-name default-directory)))
(prefix (file-remote-p default-directory)))
;; `eshell-eval-using-options' reads options of COMMAND.
(while (and (stringp (car orig-args))
(member (car orig-args) '("-u" "--user")))
(setq orig-args (cddr orig-args)))
(let ((default-directory
(if (and prefix
(or
(not
(string-equal
"sudo"
(file-remote-p default-directory 'method)))
(not
(string-equal
user
(file-remote-p default-directory 'user)))))
(format "%s|sudo:%s@%s:%s"
(substring prefix 0 -1) user host dir)
(format "/sudo:%s@%s:%s" user host dir))))
(eshell-named-command (car orig-args) (cdr orig-args))))))))
(put 'eshell/sudo 'eshell-no-numeric-conversions t)
(provide 'em-tramp)
;; Local Variables:
;; generated-autoload-file: "esh-groups.el"
;; End:
;;; em-tramp.el ends here
|
