lisp/net/tramp-compat.el

   1 ;;; tramp-compat.el --- Tramp compatibility functions
   2
   3 ;; Copyright (C) 2007-2013 Free Software Foundation, Inc.
   4
   5 ;; Author: Michael Albinus <michael.albinus@gmx.de>
   6 ;; Keywords: comm, processes
   7 ;; Package: tramp
   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 ;; Tramp's main Emacs version for development is Emacs 24.  This
  27 ;; package provides compatibility functions for Emacs 22, Emacs 23,
  28 ;; XEmacs 21.4+ and SXEmacs 22.
  29
  30 ;;; Code:
  31
  32 (eval-when-compile
  33
  34   ;; Pacify byte-compiler.
  35   (require 'cl))
  36
  37 (eval-and-compile
  38
  39   ;; Some packages must be required for XEmacs, because we compile
  40   ;; with -no-autoloads.
  41   (when (featurep 'xemacs)
  42     (require 'cus-edit)
  43     (require 'env)
  44     (require 'executable)
  45     (require 'outline)
  46     (require 'passwd)
  47     (require 'pp)
  48     (require 'regexp-opt))
  49
  50   (require 'advice)
  51   (require 'custom)
  52   (require 'format-spec)
  53   (require 'shell)
  54
  55   (require 'tramp-loaddefs)
  56
  57   ;; As long as password.el is not part of (X)Emacs, it shouldn't be
  58   ;; mandatory.
  59   (if (featurep 'xemacs)
  60       (load "password" 'noerror)
  61     (or (require 'password-cache nil 'noerror)
  62         (require 'password nil 'noerror))) ; Part of contrib.
  63
  64   ;; auth-source is relatively new.
  65   (if (featurep 'xemacs)
  66       (load "auth-source" 'noerror)
  67     (require 'auth-source nil 'noerror))
  68
  69   ;; Load the appropriate timer package.
  70   (if (featurep 'xemacs)
  71       (require 'timer-funcs)
  72     (require 'timer))
  73
  74   ;; We check whether `start-file-process' is bound.
  75   ;; Note: we deactivate this.  There are problems, at least in SXEmacs.
  76   (unless t;(fboundp 'start-file-process)
  77
  78     ;; tramp-util offers integration into other (X)Emacs packages like
  79     ;; compile.el, gud.el etc.  Not necessary in Emacs 23.
  80     (eval-after-load "tramp"
  81       '(require 'tramp-util))
  82
  83     ;; Make sure that we get integration with the VC package.  When it
  84     ;; is loaded, we need to pull in the integration module.  Not
  85     ;; necessary in Emacs 23.
  86     (eval-after-load "vc"
  87       (eval-after-load "tramp"
  88         '(require 'tramp-vc))))
  89
  90   ;; Avoid byte-compiler warnings if the byte-compiler supports this.
  91   ;; Currently, XEmacs supports this.
  92   (when (featurep 'xemacs)
  93     (unless (boundp 'byte-compile-default-warnings)
  94       (defvar byte-compile-default-warnings nil))
  95     (delq 'unused-vars byte-compile-default-warnings))
  96
  97   ;; `last-coding-system-used' is unknown in XEmacs.
  98   (unless (boundp 'last-coding-system-used)
  99     (defvar last-coding-system-used nil))
 100
 101   ;; `directory-sep-char' is an obsolete variable in Emacs.  But it is
 102   ;; used in XEmacs, so we set it here and there.  The following is
 103   ;; needed to pacify Emacs byte-compiler.
 104   ;; Note that it was removed altogether in Emacs 24.1.
 105   (when (boundp 'directory-sep-char)
 106     (defvar byte-compile-not-obsolete-var nil)
 107     (setq byte-compile-not-obsolete-var 'directory-sep-char)
 108     ;; Emacs 23.2.
 109     (defvar byte-compile-not-obsolete-vars nil)
 110     (setq byte-compile-not-obsolete-vars '(directory-sep-char)))
 111
 112   ;; `remote-file-name-inhibit-cache' has been introduced with Emacs 24.1.
 113   ;; Besides `t', `nil', and integer, we use also timestamps (as
 114   ;; returned by `current-time') internally.
 115   (defvar remote-file-name-inhibit-cache nil)
 116
 117   ;; For not existing functions, or functions with a changed argument
 118   ;; list, there are compiler warnings.  We want to avoid them in
 119   ;; cases we know what we do.
 120   (defmacro tramp-compat-funcall (function &rest arguments)
 121     (if (featurep 'xemacs)
 122         `(funcall (symbol-function ,function) ,@arguments)
 123       `(when (or (subrp ,function) (functionp ,function))
 124          (with-no-warnings (funcall ,function ,@arguments)))))
 125
 126   ;; `set-buffer-multibyte' comes from Emacs Leim.
 127   (unless (fboundp 'set-buffer-multibyte)
 128     (defalias 'set-buffer-multibyte 'ignore))
 129
 130   ;; The following functions cannot be aliases of the corresponding
 131   ;; `tramp-handle-*' functions, because this would bypass the locking
 132   ;; mechanism.
 133
 134   ;; `file-remote-p' has been introduced with Emacs 22.  The version
 135   ;; of XEmacs is not a magic file name function (yet); this is
 136   ;; corrected in tramp-util.el.  Here it is sufficient if the
 137   ;; function exists.
 138   (unless (fboundp 'file-remote-p)
 139     (defalias 'file-remote-p
 140       (lambda (file &optional identification connected)
 141         (when (tramp-tramp-file-p file)
 142           (tramp-compat-funcall
 143            'tramp-file-name-handler
 144            'file-remote-p file identification connected)))))
 145
 146   ;; `process-file' does not exist in XEmacs.
 147   (unless (fboundp 'process-file)
 148     (defalias 'process-file
 149       (lambda (program &optional infile buffer display &rest args)
 150         (when (tramp-tramp-file-p default-directory)
 151           (apply
 152            'tramp-file-name-handler
 153            'process-file program infile buffer display args)))))
 154
 155   ;; `start-file-process' is new in Emacs 23.
 156   (unless (fboundp 'start-file-process)
 157     (defalias 'start-file-process
 158       (lambda (name buffer program &rest program-args)
 159         (when (tramp-tramp-file-p default-directory)
 160           (apply
 161            'tramp-file-name-handler
 162            'start-file-process name buffer program program-args)))))
 163
 164   ;; `set-file-times' is also new in Emacs 23.
 165   (unless (fboundp 'set-file-times)
 166     (defalias 'set-file-times
 167       (lambda (filename &optional time)
 168         (when (tramp-tramp-file-p filename)
 169           (tramp-compat-funcall
 170            'tramp-file-name-handler 'set-file-times filename time)))))
 171
 172   ;; We currently use "[" and "]" in the filename format for IPv6
 173   ;; hosts of GNU Emacs.  This means that Emacs wants to expand
 174   ;; wildcards if `find-file-wildcards' is non-nil, and then barfs
 175   ;; because no expansion could be found.  We detect this situation
 176   ;; and do something really awful: we have `file-expand-wildcards'
 177   ;; return the original filename if it can't expand anything.  Let's
 178   ;; just hope that this doesn't break anything else.
 179   ;; It is not needed anymore since GNU Emacs 23.2.
 180   (unless (or (featurep 'xemacs)
 181               ;; `featurep' has only one argument in XEmacs.
 182               (funcall 'featurep 'files 'remote-wildcards))
 183     (defadvice file-expand-wildcards
 184       (around tramp-advice-file-expand-wildcards activate)
 185       (let ((name (ad-get-arg 0)))
 186         ;; If it's a Tramp file, look if wildcards need to be expanded
 187         ;; at all.
 188         (if (and
 189              (tramp-tramp-file-p name)
 190              (not (string-match
 191                    "[[*?]" (tramp-compat-funcall
 192                             'file-remote-p name 'localname))))
 193             (setq ad-return-value (list name))
 194           ;; Otherwise, just run the original function.
 195           ad-do-it)))
 196     (add-hook
 197      'tramp-unload-hook
 198      (lambda ()
 199        (ad-remove-advice
 200         'file-expand-wildcards 'around 'tramp-advice-file-expand-wildcards)
 201        (ad-activate 'file-expand-wildcards)))))
 202
 203 ;; `with-temp-message' does not exists in XEmacs.
 204 (if (fboundp 'with-temp-message)
 205     (defalias 'tramp-compat-with-temp-message 'with-temp-message)
 206   (defmacro tramp-compat-with-temp-message (message &rest body)
 207     "Display MESSAGE temporarily if non-nil while BODY is evaluated."
 208     `(progn ,@body)))
 209
 210 ;; `condition-case-unless-debug' is introduced with Emacs 24.
 211 (if (fboundp 'condition-case-unless-debug)
 212     (defalias 'tramp-compat-condition-case-unless-debug
 213       'condition-case-unless-debug)
 214   (defmacro tramp-compat-condition-case-unless-debug
 215     (var bodyform &rest handlers)
 216   "Like `condition-case' except that it does not catch anything when debugging."
 217     (declare (debug condition-case) (indent 2))
 218     (let ((bodysym (make-symbol "body")))
 219       `(let ((,bodysym (lambda () ,bodyform)))
 220          (if debug-on-error
 221              (funcall ,bodysym)
 222            (condition-case ,var
 223                (funcall ,bodysym)
 224              ,@handlers))))))
 225
 226 ;; `font-lock-add-keywords' does not exist in XEmacs.
 227 (defun tramp-compat-font-lock-add-keywords (mode keywords &optional how)
 228   "Add highlighting KEYWORDS for MODE."
 229   (ignore-errors
 230     (tramp-compat-funcall 'font-lock-add-keywords mode keywords how)))
 231
 232 (defsubst tramp-compat-temporary-file-directory ()
 233   "Return name of directory for temporary files (compat function).
 234 For Emacs, this is the variable `temporary-file-directory', for XEmacs
 235 this is the function `temp-directory'."
 236   (let (file-name-handler-alist)
 237     ;; We must return a local directory.  If it is remote, we could
 238     ;; run into an infloop.
 239     (cond
 240      ((and (boundp 'temporary-file-directory)
 241            (eval (car (get 'temporary-file-directory 'standard-value)))))
 242      ((fboundp 'temp-directory) (tramp-compat-funcall 'temp-directory))
 243      ((let ((d (getenv "TEMP"))) (and d (file-directory-p d)))
 244       (file-name-as-directory (getenv "TEMP")))
 245      ((let ((d (getenv "TMP"))) (and d (file-directory-p d)))
 246       (file-name-as-directory (getenv "TMP")))
 247      ((let ((d (getenv "TMPDIR"))) (and d (file-directory-p d)))
 248       (file-name-as-directory (getenv "TMPDIR")))
 249      ((file-exists-p "c:/temp") (file-name-as-directory "c:/temp"))
 250      (t (message (concat "Neither `temporary-file-directory' nor "
 251                          "`temp-directory' is defined -- using /tmp."))
 252         (file-name-as-directory "/tmp")))))
 253
 254 ;; `make-temp-file' exists in Emacs only.  On XEmacs, we use our own
 255 ;; implementation with `make-temp-name', creating the temporary file
 256 ;; immediately in order to avoid a security hole.
 257 (defsubst tramp-compat-make-temp-file (filename &optional dir-flag)
 258   "Create a temporary file (compat function).
 259 Add the extension of FILENAME, if existing."
 260   (let* (file-name-handler-alist
 261          (prefix (expand-file-name
 262                   (symbol-value 'tramp-temp-name-prefix)
 263                   (tramp-compat-temporary-file-directory)))
 264          (extension (file-name-extension filename t))
 265          result)
 266     (condition-case nil
 267         (setq result
 268               (tramp-compat-funcall 'make-temp-file prefix dir-flag extension))
 269       (error
 270        ;; We use our own implementation, taken from files.el.
 271        (while
 272            (condition-case ()
 273                (progn
 274                  (setq result (concat (make-temp-name prefix) extension))
 275                  (if dir-flag
 276                      (make-directory result)
 277                    (write-region "" nil result nil 'silent))
 278                  nil)
 279              (file-already-exists t))
 280          ;; The file was somehow created by someone else between
 281          ;; `make-temp-name' and `write-region', let's try again.
 282          nil)))
 283     result))
 284
 285 ;; `most-positive-fixnum' does not exist in XEmacs.
 286 (defsubst tramp-compat-most-positive-fixnum ()
 287   "Return largest positive integer value (compat function)."
 288   (cond
 289    ((boundp 'most-positive-fixnum) (symbol-value 'most-positive-fixnum))
 290    ;; Default value in XEmacs.
 291    (t 134217727)))
 292
 293 (defun tramp-compat-decimal-to-octal (i)
 294   "Return a string consisting of the octal digits of I.
 295 Not actually used.  Use `(format \"%o\" i)' instead?"
 296   (cond ((< i 0) (error "Cannot convert negative number to octal"))
 297         ((not (integerp i)) (error "Cannot convert non-integer to octal"))
 298         ((zerop i) "0")
 299         (t (concat (tramp-compat-decimal-to-octal (/ i 8))
 300                    (number-to-string (% i 8))))))
 301
 302 ;; Kudos to Gerd Moellmann for this suggestion.
 303 (defun tramp-compat-octal-to-decimal (ostr)
 304   "Given a string of octal digits, return a decimal number."
 305   (let ((x (or ostr "")))
 306     ;; `save-match' is in `tramp-mode-string-to-int' which calls this.
 307     (unless (string-match "\\`[0-7]*\\'" x)
 308       (error "Non-octal junk in string `%s'" x))
 309     (string-to-number ostr 8)))
 310
 311 ;; ID-FORMAT does not exists in XEmacs.
 312 (defun tramp-compat-file-attributes (filename &optional id-format)
 313   "Like `file-attributes' for Tramp files (compat function)."
 314   (cond
 315    ((or (null id-format) (eq id-format 'integer))
 316     (file-attributes filename))
 317    ((tramp-tramp-file-p filename)
 318     (tramp-compat-funcall
 319      'tramp-file-name-handler 'file-attributes filename id-format))
 320    (t (condition-case nil
 321           (tramp-compat-funcall 'file-attributes filename id-format)
 322         (wrong-number-of-arguments (file-attributes filename))))))
 323
 324 ;; PRESERVE-UID-GID does not exist in XEmacs.
 325 ;; PRESERVE-SELINUX-CONTEXT has been introduced with Emacs 24.1.
 326 (defun tramp-compat-copy-file
 327   (filename newname &optional ok-if-already-exists keep-date
 328             preserve-uid-gid preserve-selinux-context)
 329   "Like `copy-file' for Tramp files (compat function)."
 330   (cond
 331    (preserve-selinux-context
 332     (tramp-compat-funcall
 333      'copy-file filename newname ok-if-already-exists keep-date
 334      preserve-uid-gid preserve-selinux-context))
 335    (preserve-uid-gid
 336     (tramp-compat-funcall
 337      'copy-file filename newname ok-if-already-exists keep-date
 338      preserve-uid-gid))
 339    (t
 340     (copy-file filename newname ok-if-already-exists keep-date))))
 341
 342 ;; `copy-directory' is a new function in Emacs 23.2.  Implementation
 343 ;; is taken from there.
 344 (defun tramp-compat-copy-directory
 345   (directory newname &optional keep-time parents copy-contents)
 346   "Make a copy of DIRECTORY (compat function)."
 347   (condition-case nil
 348       (tramp-compat-funcall
 349        'copy-directory directory newname keep-time parents copy-contents)
 350
 351     ;; `copy-directory' is either not implemented, or it does not
 352     ;; support the the COPY-CONTENTS flag.  For the time being, we
 353     ;; ignore COPY-CONTENTS as well.
 354
 355     (error
 356      ;; If `default-directory' is a remote directory, make sure we
 357      ;; find its `copy-directory' handler.
 358      (let ((handler (or (find-file-name-handler directory 'copy-directory)
 359                         (find-file-name-handler newname 'copy-directory))))
 360        (if handler
 361            (funcall handler 'copy-directory directory newname keep-time parents)
 362
 363          ;; Compute target name.
 364          (setq directory (directory-file-name (expand-file-name directory))
 365                newname   (directory-file-name (expand-file-name newname)))
 366          (if (and (file-directory-p newname)
 367                   (not (string-equal (file-name-nondirectory directory)
 368                                      (file-name-nondirectory newname))))
 369              (setq newname
 370                    (expand-file-name
 371                     (file-name-nondirectory directory) newname)))
 372          (if (not (file-directory-p newname)) (make-directory newname parents))
 373
 374          ;; Copy recursively.
 375          (mapc
 376           (lambda (file)
 377             (if (file-directory-p file)
 378                 (tramp-compat-copy-directory file newname keep-time parents)
 379               (copy-file file newname t keep-time)))
 380           ;; We do not want to delete "." and "..".
 381           (directory-files
 382            directory 'full "^\\([^.]\\|\\.\\([^.]\\|\\..\\)\\).*"))
 383
 384          ;; Set directory attributes.
 385          (set-file-modes newname (file-modes directory))
 386          (if keep-time
 387              (set-file-times newname (nth 5 (file-attributes directory)))))))))
 388
 389 ;; TRASH has been introduced with Emacs 24.1.
 390 (defun tramp-compat-delete-file (filename &optional trash)
 391   "Like `delete-file' for Tramp files (compat function)."
 392   (condition-case nil
 393       (tramp-compat-funcall 'delete-file filename trash)
 394     ;; This Emacs version does not support the TRASH flag.
 395     (wrong-number-of-arguments
 396      (let ((delete-by-moving-to-trash
 397             (and (boundp 'delete-by-moving-to-trash)
 398                  (symbol-value 'delete-by-moving-to-trash)
 399                  trash)))
 400        (delete-file filename)))))
 401
 402 ;; RECURSIVE has been introduced with Emacs 23.2.
 403 (defun tramp-compat-delete-directory (directory &optional recursive)
 404   "Like `delete-directory' for Tramp files (compat function)."
 405   (if (null recursive)
 406       (delete-directory directory)
 407     (condition-case nil
 408         (tramp-compat-funcall 'delete-directory directory recursive)
 409       ;; This Emacs version does not support the RECURSIVE flag.  We
 410       ;; use the implementation from Emacs 23.2.
 411       (wrong-number-of-arguments
 412        (setq directory (directory-file-name (expand-file-name directory)))
 413        (if (not (file-symlink-p directory))
 414            (mapc (lambda (file)
 415                    (if (eq t (car (file-attributes file)))
 416                        (tramp-compat-delete-directory file recursive)
 417                      (delete-file file)))
 418                  (directory-files
 419                   directory 'full "^\\([^.]\\|\\.\\([^.]\\|\\..\\)\\).*")))
 420        (delete-directory directory)))))
 421
 422 ;; `number-sequence' does not exist in XEmacs.  Implementation is
 423 ;; taken from Emacs 23.
 424 (defun tramp-compat-number-sequence (from &optional to inc)
 425   "Return a sequence of numbers from FROM to TO as a list (compat function)."
 426   (if (or (subrp 'number-sequence) (symbol-file 'number-sequence))
 427       (tramp-compat-funcall 'number-sequence from to inc)
 428     (if (or (not to) (= from to))
 429         (list from)
 430       (or inc (setq inc 1))
 431       (when (zerop inc) (error "The increment can not be zero"))
 432       (let (seq (n 0) (next from))
 433         (if (> inc 0)
 434             (while (<= next to)
 435               (setq seq (cons next seq)
 436                     n (1+ n)
 437                     next (+ from (* n inc))))
 438           (while (>= next to)
 439             (setq seq (cons next seq)
 440                   n (1+ n)
 441                   next (+ from (* n inc)))))
 442         (nreverse seq)))))
 443
 444 (defun tramp-compat-split-string (string pattern)
 445   "Like `split-string' but omit empty strings.
 446 In Emacs, (split-string \"/foo/bar\" \"/\") returns (\"foo\" \"bar\").
 447 This is, the first, empty, element is omitted.  In XEmacs, the first
 448 element is not omitted."
 449   (delete "" (split-string string pattern)))
 450
 451 (defun tramp-compat-call-process
 452   (program &optional infile destination display &rest args)
 453   "Calls `call-process' on the local host.
 454 This is needed because for some Emacs flavors Tramp has
 455 defadvised `call-process' to behave like `process-file'.  The
 456 Lisp error raised when PROGRAM is nil is trapped also, returning 1."
 457   (let ((default-directory
 458           (if (file-remote-p default-directory)
 459               (tramp-compat-temporary-file-directory)
 460             default-directory)))
 461     (if (executable-find program)
 462         (apply 'call-process program infile destination display args)
 463       1)))
 464
 465 (defun tramp-compat-process-running-p (process-name)
 466   "Returns `t' if system process PROCESS-NAME is running for `user-login-name'."
 467   (when (stringp process-name)
 468     (cond
 469      ;; GNU Emacs 22 on w32.
 470      ((fboundp 'w32-window-exists-p)
 471       (tramp-compat-funcall 'w32-window-exists-p process-name process-name))
 472
 473      ;; GNU Emacs 23.
 474      ((and (fboundp 'list-system-processes) (fboundp 'process-attributes))
 475       (let (result)
 476         (dolist (pid (tramp-compat-funcall 'list-system-processes) result)
 477           (let ((attributes (tramp-compat-funcall 'process-attributes pid)))
 478             (when (and (string-equal
 479                         (cdr (assoc 'user attributes)) (user-login-name))
 480                        (let ((comm (cdr (assoc 'comm attributes))))
 481                          ;; The returned command name could be truncated
 482                          ;; to 15 characters.  Therefore, we cannot check
 483                          ;; for `string-equal'.
 484                          (and comm (string-match
 485                                     (concat "^" (regexp-quote comm))
 486                                     process-name))))
 487               (setq result t))))))
 488
 489      ;; Fallback, if there is no Lisp support yet.
 490      (t (let ((default-directory
 491                 (if (file-remote-p default-directory)
 492                     (tramp-compat-temporary-file-directory)
 493                   default-directory))
 494               (unix95 (getenv "UNIX95"))
 495               result)
 496           (setenv "UNIX95" "1")
 497           (when (member
 498                  (user-login-name)
 499                  (tramp-compat-split-string
 500                   (shell-command-to-string
 501                    (format "ps -C %s -o user=" process-name))
 502                   "[ \f\t\n\r\v]+"))
 503             (setq result t))
 504           (setenv "UNIX95" unix95)
 505           result)))))
 506
 507 ;; The following functions do not exist in XEmacs.  We ignore this;
 508 ;; they are used for checking a remote tty.
 509 (defun tramp-compat-process-get (process propname)
 510   "Return the value of PROCESS' PROPNAME property.
 511 This is the last value stored with `(process-put PROCESS PROPNAME VALUE)'."
 512   (ignore-errors (tramp-compat-funcall 'process-get process propname)))
 513
 514 (defun tramp-compat-process-put (process propname value)
 515   "Change PROCESS' PROPNAME property to VALUE.
 516 It can be retrieved with `(process-get PROCESS PROPNAME)'."
 517   (ignore-errors (tramp-compat-funcall 'process-put process propname value)))
 518
 519 (defun tramp-compat-set-process-query-on-exit-flag (process flag)
 520   "Specify if query is needed for process when Emacs is exited.
 521 If the second argument flag is non-nil, Emacs will query the user before
 522 exiting if process is running."
 523   (if (fboundp 'set-process-query-on-exit-flag)
 524       (tramp-compat-funcall 'set-process-query-on-exit-flag process flag)
 525     (tramp-compat-funcall 'process-kill-without-query process flag)))
 526
 527 ;; There exist different implementations for this function.
 528 (defun tramp-compat-coding-system-change-eol-conversion (coding-system eol-type)
 529   "Return a coding system like CODING-SYSTEM but with given EOL-TYPE.
 530 EOL-TYPE can be one of `dos', `unix', or `mac'."
 531   (cond ((fboundp 'coding-system-change-eol-conversion)
 532          (tramp-compat-funcall
 533           'coding-system-change-eol-conversion coding-system eol-type))
 534         ((fboundp 'subsidiary-coding-system)
 535          (tramp-compat-funcall
 536           'subsidiary-coding-system coding-system
 537           (cond ((eq eol-type 'dos) 'crlf)
 538                 ((eq eol-type 'unix) 'lf)
 539                 ((eq eol-type 'mac) 'cr)
 540                 (t
 541                  (error "Unknown EOL-TYPE `%s', must be %s"
 542                         eol-type
 543                         "`dos', `unix', or `mac'")))))
 544         (t (error "Can't change EOL conversion -- is MULE missing?"))))
 545
 546 (add-hook 'tramp-unload-hook
 547           (lambda ()
 548             (unload-feature 'tramp-compat 'force)))
 549
 550 (provide 'tramp-compat)
 551
 552 ;;; TODO:
 553
 554 ;;; tramp-compat.el ends here