lisp/net/tramp-ftp.el

   1 ;;; tramp-ftp.el --- Tramp convenience functions for Ange-FTP
   2
   3 ;; Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007,
   4 ;;   2008, 2009 Free Software Foundation, Inc.
   5
   6 ;; Author: Michael Albinus <michael.albinus@gmx.de>
   7 ;; Keywords: comm, processes
   8
   9 ;; This file is part of GNU Emacs.
  10
  11 ;; GNU Emacs is free software: you can redistribute it and/or modify
  12 ;; it under the terms of the GNU General Public License as published by
  13 ;; the Free Software Foundation, either version 3 of the License, or
  14 ;; (at your option) any later version.
  15
  16 ;; GNU Emacs is distributed in the hope that it will be useful,
  17 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 ;; GNU General Public License for more details.
  20
  21 ;; You should have received a copy of the GNU General Public License
  22 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  23
  24 ;;; Commentary:
  25
  26 ;; Convenience functions for calling Ange-FTP from Tramp.
  27 ;; Most of them are displaced from tramp.el.
  28
  29 ;;; Code:
  30
  31 (require 'tramp)
  32 (autoload 'tramp-set-connection-property "tramp-cache")
  33
  34 (eval-when-compile
  35
  36   ;; Pacify byte-compiler.
  37   (require 'cl)
  38   (require 'custom))
  39
  40 ;; Disable Ange-FTP from file-name-handler-alist.
  41 ;; To handle EFS, the following functions need to be dealt with:
  42 ;;
  43 ;; * dired-before-readin-hook contains efs-dired-before-readin
  44 ;; * file-name-handler-alist contains efs-file-handler-function
  45 ;;   and efs-root-handler-function and efs-sifn-handler-function
  46 ;; * find-file-hooks contains efs-set-buffer-mode
  47 ;;
  48 ;; But it won't happen for EFS since the XEmacs maintainers
  49 ;; don't want to use a unified filename syntax.
  50 (defun tramp-disable-ange-ftp ()
  51   "Turn Ange-FTP off.
  52 This is useful for unified remoting.  See
  53 `tramp-file-name-structure-unified' and
  54 `tramp-file-name-structure-separate' for details.  Requests suitable
  55 for Ange-FTP will be forwarded to Ange-FTP.  Also see the variables
  56 `tramp-ftp-method', `tramp-default-method', and
  57 `tramp-default-method-alist'.
  58
  59 This function is not needed in Emacsen which include Tramp, but is
  60 present for backward compatibility."
  61   (let ((a1 (rassq 'ange-ftp-hook-function file-name-handler-alist))
  62         (a2 (rassq 'ange-ftp-completion-hook-function file-name-handler-alist)))
  63     (setq file-name-handler-alist
  64           (delete a1 (delete a2 file-name-handler-alist)))))
  65
  66 (eval-after-load "ange-ftp"
  67   '(when (functionp 'tramp-disable-ange-ftp)
  68      (tramp-disable-ange-ftp)))
  69
  70 ;;;###autoload
  71 (defun tramp-ftp-enable-ange-ftp ()
  72   ;; The following code is commented out in Ange-FTP.
  73
  74   ;;; This regexp takes care of real ange-ftp file names (with a slash
  75   ;;; and colon).
  76   ;;; Don't allow the host name to end in a period--some systems use /.:
  77   (or (assoc "^/[^/:]*[^/:.]:" file-name-handler-alist)
  78       (setq file-name-handler-alist
  79             (cons '("^/[^/:]*[^/:.]:" . ange-ftp-hook-function)
  80                   file-name-handler-alist)))
  81
  82   ;;; This regexp recognizes absolute filenames with only one component,
  83   ;;; for the sake of hostname completion.
  84   (or (assoc "^/[^/:]*\\'" file-name-handler-alist)
  85       (setq file-name-handler-alist
  86             (cons '("^/[^/:]*\\'" . ange-ftp-completion-hook-function)
  87                   file-name-handler-alist)))
  88
  89   ;;; This regexp recognizes absolute filenames with only one component
  90   ;;; on Windows, for the sake of hostname completion.
  91   (and (memq system-type '(ms-dos windows-nt))
  92        (or (assoc "^[a-zA-Z]:/[^/:]*\\'" file-name-handler-alist)
  93            (setq file-name-handler-alist
  94                  (cons '("^[a-zA-Z]:/[^/:]*\\'" .
  95                          ange-ftp-completion-hook-function)
  96                        file-name-handler-alist)))))
  97
  98 (add-hook 'tramp-ftp-unload-hook 'tramp-ftp-enable-ange-ftp)
  99
 100 ;; Define FTP method ...
 101 (defcustom tramp-ftp-method "ftp"
 102   "*When this method name is used, forward all calls to Ange-FTP."
 103   :group 'tramp
 104   :type 'string)
 105
 106 ;; ... and add it to the method list.
 107 (add-to-list 'tramp-methods (cons tramp-ftp-method nil))
 108
 109 ;; Add some defaults for `tramp-default-method-alist'
 110 (add-to-list 'tramp-default-method-alist
 111              (list "\\`ftp\\." "" tramp-ftp-method))
 112 (add-to-list 'tramp-default-method-alist
 113              (list "" "\\`\\(anonymous\\|ftp\\)\\'" tramp-ftp-method))
 114
 115 ;; Add completion function for FTP method.
 116 (tramp-set-completion-function
 117  tramp-ftp-method
 118  '((tramp-parse-netrc "~/.netrc")))
 119
 120 ;; If there is URL syntax, `substitute-in-file-name' needs special
 121 ;; handling.
 122 (put 'substitute-in-file-name 'ange-ftp 'tramp-handle-substitute-in-file-name)
 123 (add-hook 'tramp-ftp-unload-hook
 124           '(lambda ()
 125              (setplist 'substitute-in-file-name
 126                        (delete 'ange-ftp
 127                                (delete 'tramp-handle-substitute-in-file-name
 128                                        (symbol-plist
 129                                         'substitute-in-file-name))))))
 130
 131 (defun tramp-ftp-file-name-handler (operation &rest args)
 132   "Invoke the Ange-FTP handler for OPERATION.
 133 First arg specifies the OPERATION, second arg is a list of arguments to
 134 pass to the OPERATION."
 135   (save-match-data
 136     (or (boundp 'ange-ftp-name-format)
 137         (require 'ange-ftp))
 138     (let ((ange-ftp-name-format
 139            (list (nth 0 tramp-file-name-structure)
 140                  (nth 3 tramp-file-name-structure)
 141                  (nth 2 tramp-file-name-structure)
 142                  (nth 4 tramp-file-name-structure)))
 143           ;; ange-ftp uses `ange-ftp-ftp-name-arg' and `ange-ftp-ftp-name-res'
 144           ;; for optimization in `ange-ftp-ftp-name'. If Tramp wasn't active,
 145           ;; there could be incorrect values from previous calls in case the
 146           ;; "ftp" method is used in the Tramp file name. So we unset
 147           ;; those values.
 148           (ange-ftp-ftp-name-arg "")
 149           (ange-ftp-ftp-name-res nil))
 150       (cond
 151        ;; If argument is a symlink, `file-directory-p' and
 152        ;; `file-exists-p' call the traversed file recursively. So we
 153        ;; cannot disable the file-name-handler this case.  We set the
 154        ;; connection property "started" in order to put the remote
 155        ;; location into the cache, which is helpful for further
 156        ;; completion.  We don't use `with-parsed-tramp-file-name',
 157        ;; because this returns another user but the one declared in
 158        ;; "~/.netrc".
 159        ((memq operation '(file-directory-p file-exists-p))
 160         (if (apply 'ange-ftp-hook-function operation args)
 161             (let ((v (tramp-dissect-file-name (car args) t)))
 162               (aset v 0 tramp-ftp-method)
 163               (tramp-set-connection-property v "started" t))
 164           nil))
 165
 166        ;; If the second argument of `copy-file' or `rename-file' is a
 167        ;; remote file name but via FTP, ange-ftp doesn't check this.
 168        ;; We must copy it locally first, because there is no place in
 169        ;; ange-ftp for correct handling.
 170        ((and (memq operation '(copy-file rename-file))
 171              (file-remote-p (cadr args))
 172              (not (tramp-ftp-file-name-p (cadr args))))
 173         (let* ((filename (car args))
 174                (newname (cadr args))
 175                (tmpfile (tramp-compat-make-temp-file filename))
 176                (args (cddr args)))
 177           ;; We must set `ok-if-already-exists' to t in the first
 178           ;; step, because the temp file has been created already.
 179           (if (eq operation 'copy-file)
 180               (apply operation filename tmpfile t (cdr args))
 181             (apply operation filename tmpfile t))
 182           (unwind-protect
 183               (rename-file tmpfile newname (car args))
 184             ;; Cleanup.
 185             (ignore-errors (delete-file tmpfile)))))
 186
 187        ;; Normally, the handlers must be discarded.
 188        ;; `inhibit-file-name-handlers' isn't sufficient, because the
 189        ;; local file name could be in Tramp syntax as well (for
 190        ;; example, returning VMS file names like "/DISK$CAM:/AAA").
 191        ;; That's why we set also `tramp-mode' to nil.
 192        (t (let* (;(tramp-mode nil)
 193                  (inhibit-file-name-handlers
 194                   (list 'tramp-file-name-handler
 195                         'tramp-completion-file-name-handler
 196                         (and (eq inhibit-file-name-operation operation)
 197                              inhibit-file-name-handlers)))
 198                  (inhibit-file-name-operation operation))
 199             (apply 'ange-ftp-hook-function operation args)))))))
 200
 201 (defun tramp-ftp-file-name-p (filename)
 202   "Check if it's a filename that should be forwarded to Ange-FTP."
 203   (let ((v (tramp-dissect-file-name filename)))
 204     (string= (tramp-file-name-method v) tramp-ftp-method)))
 205
 206 (add-to-list 'tramp-foreign-file-name-handler-alist
 207              (cons 'tramp-ftp-file-name-p 'tramp-ftp-file-name-handler))
 208
 209 (provide 'tramp-ftp)
 210
 211 ;;; TODO:
 212
 213 ;; * In case of "/ftp:host:file" this works only for functions which
 214 ;;   are defined in `tramp-file-name-handler-alist'.  Call has to be
 215 ;;   pretended in `tramp-file-name-handler' otherwise.
 216 ;;   Furthermore, there are no backup files on FTP hosts.
 217 ;;   Worth further investigations.
 218
 219 ;; arch-tag: 759fb338-5c63-4b99-bd36-b4d59db91cff
 220 ;;; tramp-ftp.el ends here