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;;; tramp-ftp.el --- Tramp convenience functions for Ange-FTP -*- lexical-binding:t -*-
;; Copyright (C) 2002-2020 Free Software Foundation, Inc.
;; Author: Michael Albinus <michael.albinus@gmx.de>
;; Keywords: comm, processes
;; Package: tramp
;; 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:
;; Convenience functions for calling Ange-FTP from Tramp.
;; Most of them are displaced from tramp.el.
;;; Code:
(require 'tramp)
;; Pacify byte-compiler.
(eval-when-compile
(require 'custom))
(defvar ange-ftp-ftp-name-arg)
(defvar ange-ftp-ftp-name-res)
(defvar ange-ftp-name-format)
;; Disable Ange-FTP from file-name-handler-alist.
(defun tramp-disable-ange-ftp ()
"Turn Ange-FTP off.
This is useful for unified remoting. See
`tramp-file-name-structure' for details. Requests suitable for
Ange-FTP will be forwarded to Ange-FTP. Also see the variables
`tramp-ftp-method', `tramp-default-method', and
`tramp-default-method-alist'.
This function is not needed in Emacsen which include Tramp, but is
present for backward compatibility."
(let ((a1 (rassq 'ange-ftp-hook-function file-name-handler-alist))
(a2 (rassq 'ange-ftp-completion-hook-function file-name-handler-alist)))
(setq file-name-handler-alist
(delete a1 (delete a2 file-name-handler-alist)))))
(with-eval-after-load 'ange-ftp
(tramp-disable-ange-ftp))
;;;###tramp-autoload
(defun tramp-ftp-enable-ange-ftp ()
"Reenable Ange-FTP, when Tramp is unloaded."
;; The following code is commented out in Ange-FTP.
;;; This regexp takes care of real ange-ftp file names (with a slash
;;; and colon).
;;; Don't allow the host name to end in a period--some systems use /.:
(or (assoc "^/[^/:]*[^/:.]:" file-name-handler-alist)
(setq file-name-handler-alist
(cons '("^/[^/:]*[^/:.]:" . ange-ftp-hook-function)
file-name-handler-alist)))
;;; This regexp recognizes absolute filenames with only one component,
;;; for the sake of hostname completion.
(or (assoc "^/[^/:]*\\'" file-name-handler-alist)
(setq file-name-handler-alist
(cons '("^/[^/:]*\\'" . ange-ftp-completion-hook-function)
file-name-handler-alist)))
;;; This regexp recognizes absolute filenames with only one component
;;; on Windows, for the sake of hostname completion.
(and (memq system-type '(ms-dos windows-nt))
(or (assoc "^[a-zA-Z]:/[^/:]*\\'" file-name-handler-alist)
(setq file-name-handler-alist
(cons '("^[a-zA-Z]:/[^/:]*\\'" .
ange-ftp-completion-hook-function)
file-name-handler-alist)))))
(add-hook 'tramp-ftp-unload-hook #'tramp-ftp-enable-ange-ftp)
;; Define FTP method ...
;;;###tramp-autoload
(defconst tramp-ftp-method "ftp"
"When this method name is used, forward all calls to Ange-FTP.")
;; ... and add it to the method list.
;;;###tramp-autoload
(tramp--with-startup
(add-to-list 'tramp-methods (cons tramp-ftp-method nil))
;; Add some defaults for `tramp-default-method-alist'.
(add-to-list 'tramp-default-method-alist
(list "\\`ftp\\." nil tramp-ftp-method))
(add-to-list 'tramp-default-method-alist
(list nil "\\`\\(anonymous\\|ftp\\)\\'" tramp-ftp-method))
;; Add completion function for FTP method.
(tramp-set-completion-function
tramp-ftp-method
'((tramp-parse-netrc "~/.netrc"))))
;;;###tramp-autoload
(defun tramp-ftp-file-name-handler (operation &rest args)
"Invoke the Ange-FTP handler for OPERATION and ARGS.
First arg specifies the OPERATION, second arg is a list of arguments to
pass to the OPERATION."
(save-match-data
(or (boundp 'ange-ftp-name-format)
(let (file-name-handler-alist) (require 'ange-ftp)))
(let ((ange-ftp-name-format
(list (nth 0 tramp-file-name-structure)
(nth 3 tramp-file-name-structure)
(nth 2 tramp-file-name-structure)
(nth 4 tramp-file-name-structure)))
;; ange-ftp uses `ange-ftp-ftp-name-arg' and `ange-ftp-ftp-name-res'
;; for optimization in `ange-ftp-ftp-name'. If Tramp wasn't active,
;; there could be incorrect values from previous calls in case the
;; "ftp" method is used in the Tramp file name. So we unset
;; those values.
(ange-ftp-ftp-name-arg "")
(ange-ftp-ftp-name-res nil))
(cond
;; If argument is a symlink, `file-directory-p' and
;; `file-exists-p' call the traversed file recursively. So we
;; cannot disable the file-name-handler this case. We set the
;; connection property "started" in order to put the remote
;; location into the cache, which is helpful for further
;; completion. We don't use `with-parsed-tramp-file-name',
;; because this returns another user but the one declared in
;; "~/.netrc".
((memq operation '(file-directory-p file-exists-p))
(if (apply #'ange-ftp-hook-function operation args)
(let ((v (tramp-dissect-file-name (car args) t)))
(setf (tramp-file-name-method v) tramp-ftp-method)
(tramp-set-connection-property v "started" t))
nil))
;; If the second argument of `copy-file' or `rename-file' is a
;; remote file name but via FTP, ange-ftp doesn't check this.
;; We must copy it locally first, because there is no place in
;; ange-ftp for correct handling.
((and (memq operation '(copy-file rename-file))
(tramp-tramp-file-p (cadr args))
(not (tramp-ftp-file-name-p (cadr args))))
(let* ((filename (car args))
(newname (cadr args))
(tmpfile (tramp-compat-make-temp-file filename))
(args (cddr args)))
;; We must set `ok-if-already-exists' to t in the first
;; step, because the temp file has been created already.
(if (eq operation 'copy-file)
(apply operation filename tmpfile t (cdr args))
(apply operation filename tmpfile t))
(unwind-protect
(rename-file tmpfile newname (car args))
;; Cleanup.
(ignore-errors (delete-file tmpfile)))))
;; Normally, the handlers must be discarded.
(t (let* ((inhibit-file-name-handlers
(list 'tramp-file-name-handler
'tramp-completion-file-name-handler
(and (eq inhibit-file-name-operation operation)
inhibit-file-name-handlers)))
(inhibit-file-name-operation operation))
(apply #'ange-ftp-hook-function operation args)))))))
;; It must be a `defsubst' in order to push the whole code into
;; tramp-loaddefs.el. Otherwise, there would be recursive autoloading.
;;;###tramp-autoload
(defsubst tramp-ftp-file-name-p (filename)
"Check if it's a FILENAME that should be forwarded to Ange-FTP."
(and (tramp-tramp-file-p filename)
(string= (tramp-file-name-method (tramp-dissect-file-name filename))
tramp-ftp-method)))
;;;###tramp-autoload
(tramp--with-startup
(add-to-list 'tramp-foreign-file-name-handler-alist
(cons #'tramp-ftp-file-name-p #'tramp-ftp-file-name-handler)))
(add-hook 'tramp-unload-hook
(lambda ()
(unload-feature 'tramp-ftp 'force)))
(provide 'tramp-ftp)
;;; TODO:
;; * There are no backup files on FTP hosts.
;;; tramp-ftp.el ends here
|
