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;;; tramp-sh.el --- Tramp access functions for (s)sh-like connections

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;; Copyright (C) 1998-2011 Free Software Foundation, Inc.
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;; (copyright statements below in code to be updated with the above notice)

;; Author: Kai Großjohann <kai.grossjohann@gmx.net>
;;         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 <http://www.gnu.org/licenses/>.

;;; Code:

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(eval-when-compile (require 'cl))	; ignore-errors
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(require 'tramp)
(require 'shell)

;; Pacify byte-compiler.  The function is needed on XEmacs only.  I'm
;; not sure at all that this is the right way to do it, but let's hope
;; it works for now, and wait for a guru to point out the Right Way to
;; achieve this.
;;(eval-when-compile
;;  (unless (fboundp 'dired-insert-set-properties)
;;    (fset 'dired-insert-set-properties 'ignore)))
;; Gerd suggests this:
(eval-when-compile (require 'dired))
;; Note that dired is required at run-time, too, when it is needed.
;; It is only needed on XEmacs for the function
;; `dired-insert-set-properties'.

(defcustom tramp-inline-compress-start-size 4096
  "*The minimum size of compressing where inline transfer.
When inline transfer, compress transfered data of file
whose size is this value or above (up to `tramp-copy-size-limit').
If it is nil, no compression at all will be applied."
  :group 'tramp
  :type '(choice (const nil) integer))

(defcustom tramp-copy-size-limit 10240
  "*The maximum file size where inline copying is preferred over an out-of-the-band copy.
If it is nil, inline out-of-the-band copy will be used without a check."
  :group 'tramp
  :type '(choice (const nil) integer))

;;;###tramp-autoload
(defcustom tramp-terminal-type "dumb"
  "*Value of TERM environment variable for logging in to remote host.
Because Tramp wants to parse the output of the remote shell, it is easily
confused by ANSI color escape sequences and suchlike.  Often, shell init
files conditionalize this setup based on the TERM environment variable."
  :group 'tramp
  :type 'string)

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;; ksh on OpenBSD 4.5 requires that $PS1 contains a `#' character for
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;; root users.  It uses the `$' character for other users.  In order
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;; to guarantee a proper prompt, we use "#$ " for the prompt.
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(defvar tramp-end-of-output
  (format
   "///%s#$"
   (md5 (concat (prin1-to-string process-environment) (current-time-string))))
  "String used to recognize end of output.
The '$' character at the end is quoted; the string cannot be
detected as prompt when being sent on echoing hosts, therefore.")

;;;###tramp-autoload
(defconst tramp-initial-end-of-output "#$ "
  "Prompt when establishing a connection.")

;; Initialize `tramp-methods' with the supported methods.
;;;###tramp-autoload
(add-to-list 'tramp-methods
  '("rcp"
    (tramp-login-program        "rsh")
    (tramp-login-args           (("%h") ("-l" "%u")))
    (tramp-remote-sh            "/bin/sh")
    (tramp-copy-program         "rcp")
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    (tramp-copy-args            (("-p" "%k") ("-r")))
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    (tramp-copy-keep-date       t)
    (tramp-copy-recursive       t)))
;;;###tramp-autoload
(add-to-list 'tramp-methods
  '("remcp"
    (tramp-login-program        "remsh")
    (tramp-login-args           (("%h") ("-l" "%u")))
    (tramp-remote-sh            "/bin/sh")
    (tramp-copy-program         "rcp")
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    (tramp-copy-args            (("-p" "%k")))
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    (tramp-copy-keep-date       t)))
;;;###tramp-autoload
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(add-to-list 'tramp-methods
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 '("scp"
   (tramp-login-program        "ssh")
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   (tramp-login-args           (("-l" "%u") ("-p" "%p")	("-e" "none") ("%h")))
   (tramp-async-args           (("-q")))
   (tramp-remote-sh            "/bin/sh")
   (tramp-copy-program         "scp")
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   (tramp-copy-args            (("-P" "%p") ("-p" "%k")	("-q") ("-r")))
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   (tramp-copy-keep-date       t)
   (tramp-copy-recursive       t)
   (tramp-gw-args              (("-o" "GlobalKnownHostsFile=/dev/null")
				("-o" "UserKnownHostsFile=/dev/null")
				("-o" "StrictHostKeyChecking=no")))
   (tramp-default-port         22)))
;;;###tramp-autoload
(add-to-list 'tramp-methods
  '("scp1"
    (tramp-login-program        "ssh")
    (tramp-login-args           (("-l" "%u") ("-p" "%p")
				 ("-1") ("-e" "none") ("%h")))
    (tramp-async-args           (("-q")))
    (tramp-remote-sh            "/bin/sh")
    (tramp-copy-program         "scp")
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    (tramp-copy-args            (("-1") ("-P" "%p") ("-p" "%k") ("-q") ("-r")))
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    (tramp-copy-keep-date       t)
    (tramp-copy-recursive       t)
    (tramp-gw-args              (("-o" "GlobalKnownHostsFile=/dev/null")
				 ("-o" "UserKnownHostsFile=/dev/null")
				 ("-o" "StrictHostKeyChecking=no")))
    (tramp-default-port         22)))
;;;###tramp-autoload
(add-to-list 'tramp-methods
  '("scp2"
    (tramp-login-program        "ssh")
    (tramp-login-args           (("-l" "%u") ("-p" "%p")
				 ("-2") ("-e" "none") ("%h")))
    (tramp-async-args           (("-q")))
    (tramp-remote-sh            "/bin/sh")
    (tramp-copy-program         "scp")
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    (tramp-copy-args            (("-2") ("-P" "%p") ("-p" "%k") ("-q") ("-r")))
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    (tramp-copy-keep-date       t)
    (tramp-copy-recursive       t)
    (tramp-gw-args              (("-o" "GlobalKnownHostsFile=/dev/null")
				 ("-o" "UserKnownHostsFile=/dev/null")
				 ("-o" "StrictHostKeyChecking=no")))
    (tramp-default-port         22)))
;;;###tramp-autoload
(add-to-list 'tramp-methods
  '("scpc"
    (tramp-login-program        "ssh")
    (tramp-login-args           (("-l" "%u") ("-p" "%p")
				 ("-o" "ControlPath=%t.%%r@%%h:%%p")
				 ("-o" "ControlMaster=yes")
				 ("-e" "none") ("%h")))
    (tramp-async-args           (("-q")))
    (tramp-remote-sh            "/bin/sh")
    (tramp-copy-program         "scp")
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    (tramp-copy-args            (("-P" "%p") ("-p" "%k") ("-q") ("-r")
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				 ("-o" "ControlPath=%t.%%r@%%h:%%p")
				 ("-o" "ControlMaster=auto")))
    (tramp-copy-keep-date       t)
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    (tramp-copy-recursive       t)
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    (tramp-gw-args              (("-o" "GlobalKnownHostsFile=/dev/null")
				 ("-o" "UserKnownHostsFile=/dev/null")
				 ("-o" "StrictHostKeyChecking=no")))
    (tramp-default-port         22)))
;;;###tramp-autoload
(add-to-list 'tramp-methods
  '("scpx"
    (tramp-login-program        "ssh")
    (tramp-login-args           (("-l" "%u") ("-p" "%p")
				 ("-e" "none") ("-t" "-t")
				 ("%h") ("/bin/sh")))
    (tramp-async-args           (("-q")))
    (tramp-remote-sh            "/bin/sh")
    (tramp-copy-program         "scp")
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    (tramp-copy-args            (("-P" "%p") ("-p" "%k") ("-q") ("-r")))
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    (tramp-copy-keep-date       t)
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    (tramp-copy-recursive       t)
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    (tramp-gw-args              (("-o" "GlobalKnownHostsFile=/dev/null")
				 ("-o" "UserKnownHostsFile=/dev/null")
				 ("-o" "StrictHostKeyChecking=no")))
    (tramp-default-port         22)))
;;;###tramp-autoload
(add-to-list 'tramp-methods
  '("sftp"
    (tramp-login-program        "ssh")
    (tramp-login-args           (("-l" "%u") ("-p" "%p") ("-e" "none") ("%h")))
    (tramp-async-args           (("-q")))
    (tramp-remote-sh            "/bin/sh")
    (tramp-copy-program         "sftp")))
;;;###tramp-autoload
(add-to-list 'tramp-methods
  '("rsync"
    (tramp-login-program        "ssh")
    (tramp-login-args           (("-l" "%u") ("-p" "%p") ("-e" "none") ("%h")))
    (tramp-async-args           (("-q")))
    (tramp-remote-sh            "/bin/sh")
    (tramp-copy-program         "rsync")
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    (tramp-copy-args            (("-e" "ssh") ("-t" "%k") ("-r")))
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    (tramp-copy-keep-date       t)
    (tramp-copy-keep-tmpfile    t)
    (tramp-copy-recursive       t)))
;;;###tramp-autoload
(add-to-list 'tramp-methods
  `("rsyncc"
    (tramp-login-program        "ssh")
    (tramp-login-args           (("-l" "%u") ("-p" "%p")
				 ("-o" "ControlPath=%t.%%r@%%h:%%p")
				 ("-o" "ControlMaster=yes")
				 ("-e" "none") ("%h")))
    (tramp-async-args           (("-q")))
    (tramp-remote-sh            "/bin/sh")
    (tramp-copy-program         "rsync")
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    (tramp-copy-args            (("-t" "%k") ("-r")))
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    (tramp-copy-env             (("RSYNC_RSH")
				 (,(concat
				    "ssh"
				    " -o ControlPath=%t.%%r@%%h:%%p"
				    " -o ControlMaster=auto"))))
    (tramp-copy-keep-date       t)
    (tramp-copy-keep-tmpfile    t)
    (tramp-copy-recursive       t)))
;;;###tramp-autoload
(add-to-list 'tramp-methods
  '("rsh"
    (tramp-login-program        "rsh")
    (tramp-login-args           (("%h") ("-l" "%u")))
    (tramp-remote-sh            "/bin/sh")))
;;;###tramp-autoload
(add-to-list 'tramp-methods
  '("remsh"
    (tramp-login-program        "remsh")
    (tramp-login-args           (("%h") ("-l" "%u")))
    (tramp-remote-sh            "/bin/sh")))
;;;###tramp-autoload
(add-to-list 'tramp-methods
  '("ssh"
    (tramp-login-program        "ssh")
    (tramp-login-args           (("-l" "%u") ("-p" "%p") ("-e" "none") ("%h")))
    (tramp-async-args           (("-q")))
    (tramp-remote-sh            "/bin/sh")
    (tramp-gw-args              (("-o" "GlobalKnownHostsFile=/dev/null")
				 ("-o" "UserKnownHostsFile=/dev/null")
				 ("-o" "StrictHostKeyChecking=no")))
    (tramp-default-port         22)))
;;;###tramp-autoload
(add-to-list 'tramp-methods
  '("ssh1"
    (tramp-login-program        "ssh")
    (tramp-login-args           (("-l" "%u") ("-p" "%p")
				 ("-1") ("-e" "none") ("%h")))
    (tramp-async-args           (("-q")))
    (tramp-remote-sh            "/bin/sh")
    (tramp-gw-args              (("-o" "GlobalKnownHostsFile=/dev/null")
				 ("-o" "UserKnownHostsFile=/dev/null")
				 ("-o" "StrictHostKeyChecking=no")))
    (tramp-default-port         22)))
;;;###tramp-autoload
(add-to-list 'tramp-methods
  '("ssh2"
    (tramp-login-program        "ssh")
    (tramp-login-args           (("-l" "%u") ("-p" "%p")
				 ("-2") ("-e" "none") ("%h")))
    (tramp-async-args           (("-q")))
    (tramp-remote-sh            "/bin/sh")
    (tramp-gw-args              (("-o" "GlobalKnownHostsFile=/dev/null")
				 ("-o" "UserKnownHostsFile=/dev/null")
				 ("-o" "StrictHostKeyChecking=no")))
    (tramp-default-port         22)))
;;;###tramp-autoload
(add-to-list 'tramp-methods
  '("sshx"
    (tramp-login-program        "ssh")
    (tramp-login-args           (("-l" "%u") ("-p" "%p")
				 ("-e" "none") ("-t" "-t")
				 ("%h") ("/bin/sh")))
    (tramp-async-args           (("-q")))
    (tramp-remote-sh            "/bin/sh")
    (tramp-gw-args              (("-o" "GlobalKnownHostsFile=/dev/null")
				 ("-o" "UserKnownHostsFile=/dev/null")
				 ("-o" "StrictHostKeyChecking=no")))
    (tramp-default-port         22)))
;;;###tramp-autoload
(add-to-list 'tramp-methods
  '("telnet"
    (tramp-login-program        "telnet")
    (tramp-login-args           (("%h") ("%p")))
    (tramp-remote-sh            "/bin/sh")
    (tramp-default-port         23)))
;;;###tramp-autoload
(add-to-list 'tramp-methods
  '("su"
    (tramp-login-program        "su")
    (tramp-login-args           (("-") ("%u")))
    (tramp-remote-sh            "/bin/sh")))
;;;###tramp-autoload
(add-to-list 'tramp-methods
  '("sudo"
    (tramp-login-program        "sudo")
    (tramp-login-args           (("-u" "%u") ("-s") ("-H") ("-p" "Password:")))
    (tramp-remote-sh            "/bin/sh")))
;;;###tramp-autoload
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(add-to-list 'tramp-methods
  '("ksu"
    (tramp-login-program        "ksu")
    (tramp-login-args           (("%u") ("-q")))
    (tramp-remote-sh            "/bin/sh")))
;;;###tramp-autoload
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(add-to-list 'tramp-methods
  '("krlogin"
    (tramp-login-program        "krlogin")
    (tramp-login-args           (("%h") ("-l" "%u") ("-x")))
    (tramp-remote-sh            "/bin/sh")))
;;;###tramp-autoload
(add-to-list 'tramp-methods
  '("plink"
    (tramp-login-program        "plink")
    (tramp-login-args           (("-l" "%u") ("-P" "%p") ("-ssh") ("%h")))
    (tramp-remote-sh            "/bin/sh")
    (tramp-password-end-of-line "xy") ;see docstring for "xy"
    (tramp-default-port         22)))
;;;###tramp-autoload
(add-to-list 'tramp-methods
  '("plink1"
    (tramp-login-program        "plink")
    (tramp-login-args           (("-l" "%u") ("-P" "%p") ("-1" "-ssh") ("%h")))
    (tramp-remote-sh            "/bin/sh")
    (tramp-password-end-of-line "xy") ;see docstring for "xy"
    (tramp-default-port         22)))
;;;###tramp-autoload
(add-to-list 'tramp-methods
  `("plinkx"
    (tramp-login-program        "plink")
    ;; ("%h") must be a single element, see
    ;; `tramp-compute-multi-hops'.
    (tramp-login-args           (("-load") ("%h") ("-t")
				 (,(format
				    "env 'TERM=%s' 'PROMPT_COMMAND=' 'PS1=%s'"
				    tramp-terminal-type
				    tramp-initial-end-of-output))
				 ("/bin/sh")))
    (tramp-remote-sh            "/bin/sh")))
;;;###tramp-autoload
(add-to-list 'tramp-methods
  '("pscp"
    (tramp-login-program        "plink")
    (tramp-login-args           (("-l" "%u") ("-P" "%p") ("-ssh") ("%h")))
    (tramp-remote-sh            "/bin/sh")
    (tramp-copy-program         "pscp")
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    (tramp-copy-args            (("-P" "%p") ("-scp") ("-p" "%k")
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				 ("-q") ("-r")))
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    (tramp-copy-keep-date       t)
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    (tramp-copy-recursive       t)
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    (tramp-password-end-of-line "xy") ;see docstring for "xy"
    (tramp-default-port         22)))
;;;###tramp-autoload
(add-to-list 'tramp-methods
  '("psftp"
    (tramp-login-program        "plink")
    (tramp-login-args           (("-l" "%u") ("-P" "%p") ("-ssh") ("%h")))
    (tramp-remote-sh            "/bin/sh")
    (tramp-copy-program         "pscp")
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    (tramp-copy-args            (("-P" "%p") ("-sftp") ("-p" "%k")
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				 ("-q") ("-r")))
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    (tramp-copy-keep-date       t)
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    (tramp-copy-recursive       t)
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    (tramp-password-end-of-line "xy"))) ;see docstring for "xy"
;;;###tramp-autoload
(add-to-list 'tramp-methods
  '("fcp"
    (tramp-login-program        "fsh")
    (tramp-login-args           (("%h") ("-l" "%u") ("sh" "-i")))
    (tramp-remote-sh            "/bin/sh -i")
    (tramp-copy-program         "fcp")
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    (tramp-copy-args            (("-p" "%k")))
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    (tramp-copy-keep-date       t)))

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;;;###tramp-autoload
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(add-to-list 'tramp-default-method-alist
	     `(,tramp-local-host-regexp "\\`root\\'" "su"))

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;;;###tramp-autoload
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(add-to-list 'tramp-default-user-alist
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	     `(,(concat "\\`" (regexp-opt '("su" "sudo" "ksu")) "\\'")
	       nil "root"))
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;; Do not add "ssh" based methods, otherwise ~/.ssh/config would be ignored.
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;;;###tramp-autoload
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(add-to-list 'tramp-default-user-alist
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	     `(,(concat
		 "\\`"
		 (regexp-opt
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		  '("rcp" "remcp" "rsh" "telnet" "krlogin"
		    "plink" "plink1" "pscp" "psftp" "fcp"))
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		 "\\'")
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	       nil ,(user-login-name)))

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;;;###tramp-autoload
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(defconst tramp-completion-function-alist-rsh
  '((tramp-parse-rhosts "/etc/hosts.equiv")
    (tramp-parse-rhosts "~/.rhosts"))
  "Default list of (FUNCTION FILE) pairs to be examined for rsh methods.")

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;;;###tramp-autoload
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(defconst tramp-completion-function-alist-ssh
  '((tramp-parse-rhosts      "/etc/hosts.equiv")
    (tramp-parse-rhosts      "/etc/shosts.equiv")
    (tramp-parse-shosts      "/etc/ssh_known_hosts")
    (tramp-parse-sconfig     "/etc/ssh_config")
    (tramp-parse-shostkeys   "/etc/ssh2/hostkeys")
    (tramp-parse-sknownhosts "/etc/ssh2/knownhosts")
    (tramp-parse-rhosts      "~/.rhosts")
    (tramp-parse-rhosts      "~/.shosts")
    (tramp-parse-shosts      "~/.ssh/known_hosts")
    (tramp-parse-sconfig     "~/.ssh/config")
    (tramp-parse-shostkeys   "~/.ssh2/hostkeys")
    (tramp-parse-sknownhosts "~/.ssh2/knownhosts"))
  "Default list of (FUNCTION FILE) pairs to be examined for ssh methods.")

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;;;###tramp-autoload
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(defconst tramp-completion-function-alist-telnet
  '((tramp-parse-hosts "/etc/hosts"))
  "Default list of (FUNCTION FILE) pairs to be examined for telnet methods.")

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;;;###tramp-autoload
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(defconst tramp-completion-function-alist-su
  '((tramp-parse-passwd "/etc/passwd"))
  "Default list of (FUNCTION FILE) pairs to be examined for su methods.")

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;;;###tramp-autoload
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(defconst tramp-completion-function-alist-putty
  '((tramp-parse-putty
     "HKEY_CURRENT_USER\\Software\\SimonTatham\\PuTTY\\Sessions"))
  "Default list of (FUNCTION REGISTRY) pairs to be examined for putty methods.")

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;;;###tramp-autoload
(eval-after-load 'tramp
  '(progn
     (tramp-set-completion-function "rcp" tramp-completion-function-alist-rsh)
     (tramp-set-completion-function "remcp" tramp-completion-function-alist-rsh)
     (tramp-set-completion-function "scp" tramp-completion-function-alist-ssh)
     (tramp-set-completion-function "scp1" tramp-completion-function-alist-ssh)
     (tramp-set-completion-function "scp2" tramp-completion-function-alist-ssh)
     (tramp-set-completion-function "scpc" tramp-completion-function-alist-ssh)
     (tramp-set-completion-function "scpx" tramp-completion-function-alist-ssh)
     (tramp-set-completion-function "sftp" tramp-completion-function-alist-ssh)
     (tramp-set-completion-function "rsync" tramp-completion-function-alist-ssh)
     (tramp-set-completion-function
      "rsyncc" tramp-completion-function-alist-ssh)
     (tramp-set-completion-function "rsh" tramp-completion-function-alist-rsh)
     (tramp-set-completion-function "remsh" tramp-completion-function-alist-rsh)
     (tramp-set-completion-function "ssh" tramp-completion-function-alist-ssh)
     (tramp-set-completion-function "ssh1" tramp-completion-function-alist-ssh)
     (tramp-set-completion-function "ssh2" tramp-completion-function-alist-ssh)
     (tramp-set-completion-function
      "ssh1_old" tramp-completion-function-alist-ssh)
     (tramp-set-completion-function
      "ssh2_old" tramp-completion-function-alist-ssh)
     (tramp-set-completion-function "sshx" tramp-completion-function-alist-ssh)
     (tramp-set-completion-function
      "telnet" tramp-completion-function-alist-telnet)
     (tramp-set-completion-function "su" tramp-completion-function-alist-su)
     (tramp-set-completion-function "sudo" tramp-completion-function-alist-su)
     (tramp-set-completion-function "ksu" tramp-completion-function-alist-su)
     (tramp-set-completion-function
      "krlogin" tramp-completion-function-alist-rsh)
     (tramp-set-completion-function "plink" tramp-completion-function-alist-ssh)
     (tramp-set-completion-function
      "plink1" tramp-completion-function-alist-ssh)
     (tramp-set-completion-function
      "plinkx" tramp-completion-function-alist-putty)
     (tramp-set-completion-function "pscp" tramp-completion-function-alist-ssh)
     (tramp-set-completion-function "fcp" tramp-completion-function-alist-ssh)))
479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499

;; "getconf PATH" yields:
;; HP-UX: /usr/bin:/usr/ccs/bin:/opt/ansic/bin:/opt/langtools/bin:/opt/fortran/bin
;; Solaris: /usr/xpg4/bin:/usr/ccs/bin:/usr/bin:/opt/SUNWspro/bin
;; GNU/Linux (Debian, Suse): /bin:/usr/bin
;; FreeBSD: /usr/bin:/bin:/usr/sbin:/sbin: - beware trailing ":"!
;; IRIX64: /usr/bin
(defcustom tramp-remote-path
  '(tramp-default-remote-path "/usr/sbin" "/usr/local/bin"
    "/local/bin" "/local/freeware/bin" "/local/gnu/bin"
    "/usr/freeware/bin" "/usr/pkg/bin" "/usr/contrib/bin")
  "*List of directories to search for executables on remote host.
For every remote host, this variable will be set buffer local,
keeping the list of existing directories on that host.

You can use `~' in this list, but when searching for a shell which groks
tilde expansion, all directory names starting with `~' will be ignored.

`Default Directories' represent the list of directories given by
the command \"getconf PATH\".  It is recommended to use this
entry on top of this list, because these are the default
500 501 502
directories for POSIX compatible commands.  On remote hosts which
do not offer the getconf command (like cygwin), the value
\"/bin:/usr/bin\" is used instead of.
503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526

`Private Directories' are the settings of the $PATH environment,
as given in your `~/.profile'."
  :group 'tramp
  :type '(repeat (choice
		  (const :tag "Default Directories" tramp-default-remote-path)
		  (const :tag "Private Directories" tramp-own-remote-path)
		  (string :tag "Directory"))))

(defcustom tramp-remote-process-environment
  `("HISTFILE=$HOME/.tramp_history" "HISTSIZE=1" "LC_ALL=C"
    ,(format "TERM=%s" tramp-terminal-type)
    "EMACS=t" ;; Deprecated.
    ,(format "INSIDE_EMACS='%s,tramp:%s'" emacs-version tramp-version)
    "CDPATH=" "HISTORY=" "MAIL=" "MAILCHECK=" "MAILPATH="
    "autocorrect=" "correct=")

  "*List of environment variables to be set on the remote host.

Each element should be a string of the form ENVVARNAME=VALUE.  An
entry ENVVARNAME= diables the corresponding environment variable,
which might have been set in the init files like ~/.profile.

Special handling is applied to the PATH environment, which should
527
not be set here. Instead, it should be set via `tramp-remote-path'."
528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661
  :group 'tramp
  :type '(repeat string))

(defcustom tramp-sh-extra-args '(("/bash\\'" . "-norc -noprofile"))
  "*Alist specifying extra arguments to pass to the remote shell.
Entries are (REGEXP . ARGS) where REGEXP is a regular expression
matching the shell file name and ARGS is a string specifying the
arguments.

This variable is only used when Tramp needs to start up another shell
for tilde expansion.  The extra arguments should typically prevent the
shell from reading its init file."
  :group 'tramp
  ;; This might be the wrong way to test whether the widget type
  ;; `alist' is available.  Who knows the right way to test it?
  :type (if (get 'alist 'widget-type)
	    '(alist :key-type string :value-type string)
	  '(repeat (cons string string))))

(defconst tramp-actions-before-shell
  '((tramp-login-prompt-regexp tramp-action-login)
    (tramp-password-prompt-regexp tramp-action-password)
    (tramp-wrong-passwd-regexp tramp-action-permission-denied)
    (shell-prompt-pattern tramp-action-succeed)
    (tramp-shell-prompt-pattern tramp-action-succeed)
    (tramp-yesno-prompt-regexp tramp-action-yesno)
    (tramp-yn-prompt-regexp tramp-action-yn)
    (tramp-terminal-prompt-regexp tramp-action-terminal)
    (tramp-process-alive-regexp tramp-action-process-alive))
  "List of pattern/action pairs.
Whenever a pattern matches, the corresponding action is performed.
Each item looks like (PATTERN ACTION).

The PATTERN should be a symbol, a variable.  The value of this
variable gives the regular expression to search for.  Note that the
regexp must match at the end of the buffer, \"\\'\" is implicitly
appended to it.

The ACTION should also be a symbol, but a function.  When the
corresponding PATTERN matches, the ACTION function is called.")

(defconst tramp-actions-copy-out-of-band
  '((tramp-password-prompt-regexp tramp-action-password)
    (tramp-wrong-passwd-regexp tramp-action-permission-denied)
    (tramp-copy-failed-regexp tramp-action-permission-denied)
    (tramp-process-alive-regexp tramp-action-out-of-band))
  "List of pattern/action pairs.
This list is used for copying/renaming with out-of-band methods.

See `tramp-actions-before-shell' for more info.")

(defconst tramp-uudecode
  "(echo begin 600 /tmp/tramp.$$; tail +2) | uudecode
cat /tmp/tramp.$$
rm -f /tmp/tramp.$$"
  "Shell function to implement `uudecode' to standard output.
Many systems support `uudecode -o /dev/stdout' or `uudecode -o -'
for this or `uudecode -p', but some systems don't, and for them
we have this shell function.")

(defconst tramp-perl-file-truename
  "%s -e '
use File::Spec;
use Cwd \"realpath\";

sub recursive {
    my ($volume, @dirs) = @_;
    my $real = realpath(File::Spec->catpath(
                   $volume, File::Spec->catdir(@dirs), \"\"));
    if ($real) {
        my ($vol, $dir) = File::Spec->splitpath($real, 1);
        return ($vol, File::Spec->splitdir($dir));
    }
    else {
        my $last = pop(@dirs);
        ($volume, @dirs) = recursive($volume, @dirs);
        push(@dirs, $last);
        return ($volume, @dirs);
    }
}

$result = realpath($ARGV[0]);
if (!$result) {
    my ($vol, $dir) = File::Spec->splitpath($ARGV[0], 1);
    ($vol, @dirs) = recursive($vol, File::Spec->splitdir($dir));

    $result = File::Spec->catpath($vol, File::Spec->catdir(@dirs), \"\");
}

if ($ARGV[0] =~ /\\/$/) {
    $result = $result . \"/\";
}

print \"\\\"$result\\\"\\n\";
' \"$1\" 2>/dev/null"
  "Perl script to produce output suitable for use with `file-truename'
on the remote file system.
Escape sequence %s is replaced with name of Perl binary.
This string is passed to `format', so percent characters need to be doubled.")

(defconst tramp-perl-file-name-all-completions
  "%s -e 'sub case {
 my $str = shift;
 if ($ARGV[2]) {
  return lc($str);
 }
 else {
  return $str;
 }
}
opendir(d, $ARGV[0]) || die(\"$ARGV[0]: $!\\nfail\\n\");
@files = readdir(d); closedir(d);
foreach $f (@files) {
 if (case(substr($f, 0, length($ARGV[1]))) eq case($ARGV[1])) {
  if (-d \"$ARGV[0]/$f\") {
   print \"$f/\\n\";
  }
  else {
   print \"$f\\n\";
  }
 }
}
print \"ok\\n\"
' \"$1\" \"$2\" \"$3\" 2>/dev/null"
  "Perl script to produce output suitable for use with
`file-name-all-completions' on the remote file system.  Escape
sequence %s is replaced with name of Perl binary.  This string is
passed to `format', so percent characters need to be doubled.")

;; Perl script to implement `file-attributes' in a Lisp `read'able
;; output.  If you are hacking on this, note that you get *no* output
;; unless this spits out a complete line, including the '\n' at the
;; end.
;; The device number is returned as "-1", because there will be a virtual
662
;; device number set in `tramp-sh-handle-file-attributes'.
663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779
(defconst tramp-perl-file-attributes
  "%s -e '
@stat = lstat($ARGV[0]);
if (!@stat) {
    print \"nil\\n\";
    exit 0;
}
if (($stat[2] & 0170000) == 0120000)
{
    $type = readlink($ARGV[0]);
    $type = \"\\\"$type\\\"\";
}
elsif (($stat[2] & 0170000) == 040000)
{
    $type = \"t\";
}
else
{
    $type = \"nil\"
};
$uid = ($ARGV[1] eq \"integer\") ? $stat[4] : \"\\\"\" . getpwuid($stat[4]) . \"\\\"\";
$gid = ($ARGV[1] eq \"integer\") ? $stat[5] : \"\\\"\" . getgrgid($stat[5]) . \"\\\"\";
printf(
    \"(%%s %%u %%s %%s (%%u %%u) (%%u %%u) (%%u %%u) %%u.0 %%u t (%%u . %%u) -1)\\n\",
    $type,
    $stat[3],
    $uid,
    $gid,
    $stat[8] >> 16 & 0xffff,
    $stat[8] & 0xffff,
    $stat[9] >> 16 & 0xffff,
    $stat[9] & 0xffff,
    $stat[10] >> 16 & 0xffff,
    $stat[10] & 0xffff,
    $stat[7],
    $stat[2],
    $stat[1] >> 16 & 0xffff,
    $stat[1] & 0xffff
);' \"$1\" \"$2\" 2>/dev/null"
  "Perl script to produce output suitable for use with `file-attributes'
on the remote file system.
Escape sequence %s is replaced with name of Perl binary.
This string is passed to `format', so percent characters need to be doubled.")

(defconst tramp-perl-directory-files-and-attributes
  "%s -e '
chdir($ARGV[0]) or printf(\"\\\"Cannot change to $ARGV[0]: $''!''\\\"\\n\"), exit();
opendir(DIR,\".\") or printf(\"\\\"Cannot open directory $ARGV[0]: $''!''\\\"\\n\"), exit();
@list = readdir(DIR);
closedir(DIR);
$n = scalar(@list);
printf(\"(\\n\");
for($i = 0; $i < $n; $i++)
{
    $filename = $list[$i];
    @stat = lstat($filename);
    if (($stat[2] & 0170000) == 0120000)
    {
        $type = readlink($filename);
        $type = \"\\\"$type\\\"\";
    }
    elsif (($stat[2] & 0170000) == 040000)
    {
        $type = \"t\";
    }
    else
    {
        $type = \"nil\"
    };
    $uid = ($ARGV[1] eq \"integer\") ? $stat[4] : \"\\\"\" . getpwuid($stat[4]) . \"\\\"\";
    $gid = ($ARGV[1] eq \"integer\") ? $stat[5] : \"\\\"\" . getgrgid($stat[5]) . \"\\\"\";
    printf(
        \"(\\\"%%s\\\" %%s %%u %%s %%s (%%u %%u) (%%u %%u) (%%u %%u) %%u.0 %%u t (%%u . %%u) (%%u . %%u))\\n\",
        $filename,
        $type,
        $stat[3],
        $uid,
        $gid,
        $stat[8] >> 16 & 0xffff,
        $stat[8] & 0xffff,
        $stat[9] >> 16 & 0xffff,
        $stat[9] & 0xffff,
        $stat[10] >> 16 & 0xffff,
        $stat[10] & 0xffff,
        $stat[7],
        $stat[2],
        $stat[1] >> 16 & 0xffff,
        $stat[1] & 0xffff,
        $stat[0] >> 16 & 0xffff,
        $stat[0] & 0xffff);
}
printf(\")\\n\");' \"$1\" \"$2\" 2>/dev/null"
  "Perl script implementing `directory-files-attributes' as Lisp `read'able
output.
Escape sequence %s is replaced with name of Perl binary.
This string is passed to `format', so percent characters need to be doubled.")

;; These two use base64 encoding.
(defconst tramp-perl-encode-with-module
  "%s -MMIME::Base64 -0777 -ne 'print encode_base64($_)' 2>/dev/null"
  "Perl program to use for encoding a file.
Escape sequence %s is replaced with name of Perl binary.
This string is passed to `format', so percent characters need to be doubled.
This implementation requires the MIME::Base64 Perl module to be installed
on the remote host.")

(defconst tramp-perl-decode-with-module
  "%s -MMIME::Base64 -0777 -ne 'print decode_base64($_)' 2>/dev/null"
  "Perl program to use for decoding a file.
Escape sequence %s is replaced with name of Perl binary.
This string is passed to `format', so percent characters need to be doubled.
This implementation requires the MIME::Base64 Perl module to be installed
on the remote host.")

(defconst tramp-perl-encode
  "%s -e '
# This script contributed by Juanma Barranquero <lektu@terra.es>.
780
# Copyright (C) 2002-2011 Free Software Foundation, Inc.
781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820
use strict;

my %%trans = do {
    my $i = 0;
    map {(substr(unpack(q(B8), chr $i++), 2, 6), $_)}
      split //, q(ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/);
};

binmode(\\*STDIN);

# We read in chunks of 54 bytes, to generate output lines
# of 72 chars (plus end of line)
$/ = \\54;

while (my $data = <STDIN>) {
    my $pad = q();

    # Only for the last chunk, and only if did not fill the last three-byte packet
    if (eof) {
        my $mod = length($data) %% 3;
        $pad = q(=) x (3 - $mod) if $mod;
    }

    # Not the fastest method, but it is simple: unpack to binary string, split
    # by groups of 6 bits and convert back from binary to byte; then map into
    # the translation table
    print
      join q(),
        map($trans{$_},
            (substr(unpack(q(B*), $data) . q(00000), 0, 432) =~ /....../g)),
              $pad,
                qq(\\n);
}' 2>/dev/null"
  "Perl program to use for encoding a file.
Escape sequence %s is replaced with name of Perl binary.
This string is passed to `format', so percent characters need to be doubled.")

(defconst tramp-perl-decode
  "%s -e '
# This script contributed by Juanma Barranquero <lektu@terra.es>.
821
# Copyright (C) 2002-2011 Free Software Foundation, Inc.
822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906
use strict;

my %%trans = do {
    my $i = 0;
    map {($_, substr(unpack(q(B8), chr $i++), 2, 6))}
      split //, q(ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/)
};

my %%bytes = map {(unpack(q(B8), chr $_), chr $_)} 0 .. 255;

binmode(\\*STDOUT);

# We are going to accumulate into $pending to accept any line length
# (we do not check they are <= 76 chars as the RFC says)
my $pending = q();

while (my $data = <STDIN>) {
    chomp $data;

    # If we find one or two =, we have reached the end and
    # any following data is to be discarded
    my $finished = $data =~ s/(==?).*/$1/;
    $pending .= $data;

    my $len = length($pending);
    my $chunk = substr($pending, 0, $len & ~3);
    $pending = substr($pending, $len & ~3 + 1);

    # Easy method: translate from chars to (pregenerated) six-bit packets, join,
    # split in 8-bit chunks and convert back to char.
    print join q(),
      map $bytes{$_},
        ((join q(), map {$trans{$_} || q()} split //, $chunk) =~ /......../g);

    last if $finished;
}' 2>/dev/null"
  "Perl program to use for decoding a file.
Escape sequence %s is replaced with name of Perl binary.
This string is passed to `format', so percent characters need to be doubled.")

(defconst tramp-vc-registered-read-file-names
  "echo \"(\"
while read file; do
    if %s \"$file\"; then
	echo \"(\\\"$file\\\" \\\"file-exists-p\\\" t)\"
    else
	echo \"(\\\"$file\\\" \\\"file-exists-p\\\" nil)\"
    fi
    if %s \"$file\"; then
	echo \"(\\\"$file\\\" \\\"file-readable-p\\\" t)\"
    else
	echo \"(\\\"$file\\\" \\\"file-readable-p\\\" nil)\"
    fi
done
echo \")\""
  "Script to check existence of VC related files.
It must be send formatted with two strings; the tests for file
existence, and file readability.  Input shall be read via
here-document, otherwise the command could exceed maximum length
of command line.")

(defconst tramp-file-mode-type-map
  '((0  . "-")  ; Normal file (SVID-v2 and XPG2)
    (1  . "p")  ; fifo
    (2  . "c")  ; character device
    (3  . "m")  ; multiplexed character device (v7)
    (4  . "d")  ; directory
    (5  . "?")  ; Named special file (XENIX)
    (6  . "b")  ; block device
    (7  . "?")  ; multiplexed block device (v7)
    (8  . "-")  ; regular file
    (9  . "n")  ; network special file (HP-UX)
    (10 . "l")  ; symlink
    (11 . "?")  ; ACL shadow inode (Solaris, not userspace)
    (12 . "s")  ; socket
    (13 . "D")  ; door special (Solaris)
    (14 . "w")) ; whiteout (BSD)
  "A list of file types returned from the `stat' system call.
This is used to map a mode number to a permission string.")

;; New handlers should be added here.  The following operations can be
;; handled using the normal primitives: file-name-sans-versions,
;; get-file-buffer.
(defconst tramp-sh-file-name-handler-alist
  '((load . tramp-handle-load)
907
    (make-symbolic-link . tramp-sh-handle-make-symbolic-link)
908 909 910
    (file-name-as-directory . tramp-handle-file-name-as-directory)
    (file-name-directory . tramp-handle-file-name-directory)
    (file-name-nondirectory . tramp-handle-file-name-nondirectory)
911 912 913 914 915
    (file-truename . tramp-sh-handle-file-truename)
    (file-exists-p . tramp-sh-handle-file-exists-p)
    (file-directory-p . tramp-sh-handle-file-directory-p)
    (file-executable-p . tramp-sh-handle-file-executable-p)
    (file-readable-p . tramp-sh-handle-file-readable-p)
916 917
    (file-regular-p . tramp-handle-file-regular-p)
    (file-symlink-p . tramp-handle-file-symlink-p)
918 919 920 921
    (file-writable-p . tramp-sh-handle-file-writable-p)
    (file-ownership-preserved-p . tramp-sh-handle-file-ownership-preserved-p)
    (file-newer-than-file-p . tramp-sh-handle-file-newer-than-file-p)
    (file-attributes . tramp-sh-handle-file-attributes)
922 923
    (file-modes . tramp-handle-file-modes)
    (directory-files . tramp-handle-directory-files)
924 925 926
    (directory-files-and-attributes
     . tramp-sh-handle-directory-files-and-attributes)
    (file-name-all-completions . tramp-sh-handle-file-name-all-completions)
927
    (file-name-completion . tramp-handle-file-name-completion)
928 929 930 931 932 933 934 935 936
    (add-name-to-file . tramp-sh-handle-add-name-to-file)
    (copy-file . tramp-sh-handle-copy-file)
    (copy-directory . tramp-sh-handle-copy-directory)
    (rename-file . tramp-sh-handle-rename-file)
    (set-file-modes . tramp-sh-handle-set-file-modes)
    (set-file-times . tramp-sh-handle-set-file-times)
    (make-directory . tramp-sh-handle-make-directory)
    (delete-directory . tramp-sh-handle-delete-directory)
    (delete-file . tramp-sh-handle-delete-file)
937 938
    (directory-file-name . tramp-handle-directory-file-name)
    ;; `executable-find' is not official yet.
939 940 941 942 943 944
    (executable-find . tramp-sh-handle-executable-find)
    (start-file-process . tramp-sh-handle-start-file-process)
    (process-file . tramp-sh-handle-process-file)
    (shell-command . tramp-sh-handle-shell-command)
    (insert-directory . tramp-sh-handle-insert-directory)
    (expand-file-name . tramp-sh-handle-expand-file-name)
945
    (substitute-in-file-name . tramp-handle-substitute-in-file-name)
946
    (file-local-copy . tramp-sh-handle-file-local-copy)
947 948 949
    (file-remote-p . tramp-handle-file-remote-p)
    (insert-file-contents . tramp-handle-insert-file-contents)
    (insert-file-contents-literally
950 951
     . tramp-sh-handle-insert-file-contents-literally)
    (write-region . tramp-sh-handle-write-region)
952
    (find-backup-file-name . tramp-handle-find-backup-file-name)
953
    (make-auto-save-file-name . tramp-sh-handle-make-auto-save-file-name)
954
    (unhandled-file-name-directory . tramp-handle-unhandled-file-name-directory)
955
    (dired-compress-file . tramp-sh-handle-dired-compress-file)
956
    (dired-recursive-delete-directory
957
     . tramp-sh-handle-dired-recursive-delete-directory)
958
    (dired-uncache . tramp-handle-dired-uncache)
959 960 961 962 963
    (set-visited-file-modtime . tramp-sh-handle-set-visited-file-modtime)
    (verify-visited-file-modtime . tramp-sh-handle-verify-visited-file-modtime)
    (file-selinux-context . tramp-sh-handle-file-selinux-context)
    (set-file-selinux-context . tramp-sh-handle-set-file-selinux-context)
    (vc-registered . tramp-sh-handle-vc-registered))
964 965 966 967 968 969 970 971 972 973
  "Alist of handler functions.
Operations not mentioned here will be handled by the normal Emacs functions.")

;; This must be the last entry, because `identity' always matches.
;;;###tramp-autoload
(add-to-list 'tramp-foreign-file-name-handler-alist
	     '(identity . tramp-sh-file-name-handler) 'append)

;;; File Name Handler Functions:

974
(defun tramp-sh-handle-make-symbolic-link
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  (filename linkname &optional ok-if-already-exists)
  "Like `make-symbolic-link' for Tramp files.
If LINKNAME is a non-Tramp file, it is used verbatim as the target of
the symlink.  If LINKNAME is a Tramp file, only the localname component is
used as the target of the symlink.

If LINKNAME is a Tramp file and the localname component is relative, then
it is expanded first, before the localname component is taken.  Note that
this can give surprising results if the user/host for the source and
target of the symlink differ."
  (with-parsed-tramp-file-name linkname l
    (let ((ln (tramp-get-remote-ln l))
	  (cwd (tramp-run-real-handler
		'file-name-directory (list l-localname))))
      (unless ln
	(tramp-error
	 l 'file-error
	 "Making a symbolic link.  ln(1) does not exist on the remote host."))

      ;; Do the 'confirm if exists' thing.
      (when (file-exists-p linkname)
	;; What to do?
	(if (or (null ok-if-already-exists) ; not allowed to exist
		(and (numberp ok-if-already-exists)
		     (not (yes-or-no-p
			   (format
			    "File %s already exists; make it a link anyway? "
			    l-localname)))))
	    (tramp-error
	     l 'file-already-exists "File %s already exists" l-localname)
	  (delete-file linkname)))

      ;; If FILENAME is a Tramp name, use just the localname component.
      (when (tramp-tramp-file-p filename)
	(setq filename
	      (tramp-file-name-localname
	       (tramp-dissect-file-name (expand-file-name filename)))))

      (tramp-flush-file-property l (file-name-directory l-localname))
      (tramp-flush-file-property l l-localname)

      ;; Right, they are on the same host, regardless of user, method, etc.
      ;; We now make the link on the remote machine. This will occur as the user
      ;; that FILENAME belongs to.
      (tramp-send-command-and-check
       l
       (format
	"cd %s && %s -sf %s %s"
	(tramp-shell-quote-argument cwd)
	ln
	(tramp-shell-quote-argument filename)
	(tramp-shell-quote-argument l-localname))
       t))))

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(defun tramp-sh-handle-file-truename (filename &optional counter prev-dirs)
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  "Like `file-truename' for Tramp files."
  (with-parsed-tramp-file-name (expand-file-name filename) nil
    (with-file-property v localname "file-truename"
      (let ((result nil))			; result steps in reverse order
	(tramp-message v 4 "Finding true name for `%s'" filename)
	(cond
	 ;; Use GNU readlink --canonicalize-missing where available.
	 ((tramp-get-remote-readlink v)
	  (setq result
		(tramp-send-command-and-read
		 v
		 (format "echo \"\\\"`%s --canonicalize-missing %s`\\\"\""
			 (tramp-get-remote-readlink v)
			 (tramp-shell-quote-argument localname)))))

	 ;; Use Perl implementation.
	 ((and (tramp-get-remote-perl v)
	       (tramp-get-connection-property v "perl-file-spec" nil)
	       (tramp-get-connection-property v "perl-cwd-realpath" nil))
	  (tramp-maybe-send-script
	   v tramp-perl-file-truename "tramp_perl_file_truename")
	  (setq result
		(tramp-send-command-and-read
		 v
		 (format "tramp_perl_file_truename %s"
			 (tramp-shell-quote-argument localname)))))

	 ;; Do it yourself.  We bind `directory-sep-char' here for
	 ;; XEmacs on Windows, which would otherwise use backslash.
	 (t (let* ((directory-sep-char ?/)
		   (steps (tramp-compat-split-string localname "/"))
		   (localnamedir (tramp-run-real-handler
				  'file-name-as-directory (list localname)))
		   (is-dir (string= localname localnamedir))
		   (thisstep nil)
		   (numchase 0)
		   ;; Don't make the following value larger than
		   ;; necessary.  People expect an error message in a
		   ;; timely fashion when something is wrong;
		   ;; otherwise they might think that Emacs is hung.
		   ;; Of course, correctness has to come first.
		   (numchase-limit 20)
		   symlink-target)
	      (while (and steps (< numchase numchase-limit))
		(setq thisstep (pop steps))
		(tramp-message
		 v 5 "Check %s"
		 (mapconcat 'identity
			    (append '("") (reverse result) (list thisstep))
			    "/"))
		(setq symlink-target
		      (nth 0 (file-attributes
			      (tramp-make-tramp-file-name
			       method user host
			       (mapconcat 'identity
					  (append '("")
						  (reverse result)
						  (list thisstep))
					  "/")))))
		(cond ((string= "." thisstep)
		       (tramp-message v 5 "Ignoring step `.'"))
		      ((string= ".." thisstep)
		       (tramp-message v 5 "Processing step `..'")
		       (pop result))
		      ((stringp symlink-target)
		       ;; It's a symlink, follow it.
		       (tramp-message v 5 "Follow symlink to %s" symlink-target)
		       (setq numchase (1+ numchase))
		       (when (file-name-absolute-p symlink-target)
			 (setq result nil))
		       ;; If the symlink was absolute, we'll get a string like
		       ;; "/user@host:/some/target"; extract the
		       ;; "/some/target" part from it.
		       (when (tramp-tramp-file-p symlink-target)
			 (unless (tramp-equal-remote filename symlink-target)
			   (tramp-error
			    v 'file-error
			    "Symlink target `%s' on wrong host" symlink-target))
			 (setq symlink-target localname))
		       (setq steps
			     (append (tramp-compat-split-string
				      symlink-target "/")
				     steps)))
		      (t
		       ;; It's a file.
		       (setq result (cons thisstep result)))))
	      (when (>= numchase numchase-limit)
		(tramp-error
		 v 'file-error
		 "Maximum number (%d) of symlinks exceeded" numchase-limit))
	      (setq result (reverse result))
	      ;; Combine list to form string.
	      (setq result
		    (if result
			(mapconcat 'identity (cons "" result) "/")
		      "/"))
	      (when (and is-dir (or (string= "" result)
				    (not (string= (substring result -1) "/"))))
		(setq result (concat result "/"))))))

        (tramp-message v 4 "True name of `%s' is `%s'" filename result)
        (tramp-make-tramp-file-name method user host result)))))

;; Basic functions.

1135
(defun tramp-sh-handle-file-exists-p (filename)
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  "Like `file-exists-p' for Tramp files."
  (with-parsed-tramp-file-name filename nil
    (with-file-property v localname "file-exists-p"
      (or (not (null (tramp-get-file-property
                      v localname "file-attributes-integer" nil)))
          (not (null (tramp-get-file-property
                      v localname "file-attributes-string" nil)))
	  (tramp-send-command-and-check
	   v
	   (format
	    "%s %s"
	    (tramp-get-file-exists-command v)
	    (tramp-shell-quote-argument localname)))))))

;; CCC: This should check for an error condition and signal failure
;;      when something goes wrong.
;; Daniel Pittman <daniel@danann.net>
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(defun tramp-sh-handle-file-attributes (filename &optional id-format)
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  "Like `file-attributes' for Tramp files."
  (unless id-format (setq id-format 'integer))
  ;; Don't modify `last-coding-system-used' by accident.
  (let ((last-coding-system-used last-coding-system-used))
    (with-parsed-tramp-file-name (expand-file-name filename) nil
      (with-file-property v localname (format "file-attributes-%s" id-format)
	(save-excursion
	  (tramp-convert-file-attributes
	   v
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	   (or
	    (cond
	     ((tramp-get-remote-stat v)
	      (tramp-do-file-attributes-with-stat v localname id-format))
	     ((tramp-get-remote-perl v)
	      (tramp-do-file-attributes-with-perl v localname id-format))
	     (t nil))
	    ;; The scripts could fail, for example with huge file size.
	    (tramp-do-file-attributes-with-ls v localname id-format))))))))
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(defun tramp-do-file-attributes-with-ls (vec localname &optional id-format)
  "Implement `file-attributes' for Tramp files using the ls(1) command."
  (let (symlinkp dirp
		 res-inode res-filemodes res-numlinks
		 res-uid res-gid res-size res-symlink-target)
    (tramp-message vec 5 "file attributes with ls: %s" localname)
    (tramp-send-command
     vec
     (format "(%s %s || %s -h %s) && %s %s %s"
	     (tramp-get-file-exists-command vec)
	     (tramp-shell-quote-argument localname)
	     (tramp-get-test-command vec)
	     (tramp-shell-quote-argument localname)
	     (tramp-get-ls-command vec)
	     (if (eq id-format 'integer) "-ildn" "-ild")
	     (tramp-shell-quote-argument localname)))
    ;; parse `ls -l' output ...
    (with-current-buffer (tramp-get-buffer vec)
      (when (> (buffer-size) 0)
        (goto-char (point-min))
        ;; ... inode
        (setq res-inode
              (condition-case err
                  (read (current-buffer))
                (invalid-read-syntax
                 (when (and (equal (cadr err)
                                   "Integer constant overflow in reader")
                            (string-match
                             "^[0-9]+\\([0-9][0-9][0-9][0-9][0-9]\\)\\'"
                             (car (cddr err))))
                   (let* ((big (read (substring (car (cddr err)) 0
                                                (match-beginning 1))))
                          (small (read (match-string 1 (car (cddr err)))))
                          (twiddle (/ small 65536)))
                     (cons (+ big twiddle)
                           (- small (* twiddle 65536))))))))
        ;; ... file mode flags
        (setq res-filemodes (symbol-name (read (current-buffer))))
        ;; ... number links
        (setq res-numlinks (read (current-buffer)))
        ;; ... uid and gid
        (setq res-uid (read (current-buffer)))
        (setq res-gid (read (current-buffer)))
        (if (eq id-format 'integer)
            (progn
              (unless (numberp res-uid) (setq res-uid -1))
              (unless (numberp res-gid) (setq res-gid -1)))
          (progn
            (unless (stringp res-uid) (setq res-uid (symbol-name res-uid)))
            (unless (stringp res-gid) (setq res-gid (symbol-name res-gid)))))
        ;; ... size
        (setq res-size (read (current-buffer)))
        ;; From the file modes, figure out other stuff.
        (setq symlinkp (eq ?l (aref res-filemodes 0)))
        (setq dirp (eq ?d (aref res-filemodes 0)))
        ;; if symlink, find out file name pointed to
        (when symlinkp
          (search-forward "-> ")
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          (setq res-symlink-target (buffer-substring (point) (point-at-eol))))
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        ;; return data gathered
        (list
         ;; 0. t for directory, string (name linked to) for symbolic
         ;; link, or nil.
         (or dirp res-symlink-target)
         ;; 1. Number of links to file.
         res-numlinks
         ;; 2. File uid.
         res-uid
         ;; 3. File gid.
         res-gid
         ;; 4. Last access time, as a list of two integers. First
         ;; integer has high-order 16 bits of time, second has low 16
         ;; bits.
         ;; 5. Last modification time, likewise.
         ;; 6. Last status change time, likewise.
         '(0 0) '(0 0) '(0 0)		;CCC how to find out?
         ;; 7. Size in bytes (-1, if number is out of range).
         res-size
         ;; 8. File modes, as a string of ten letters or dashes as in ls -l.
         res-filemodes
         ;; 9. t if file's gid would change if file were deleted and
         ;; recreated.  Will be set in `tramp-convert-file-attributes'
         t
         ;; 10. inode number.
         res-inode
         ;; 11. Device number.  Will be replaced by a virtual device number.
         -1
         )))))

(defun tramp-do-file-attributes-with-perl
  (vec localname &optional id-format)
  "Implement `file-attributes' for Tramp files using a Perl script."
  (tramp-message vec 5 "file attributes with perl: %s" localname)
  (tramp-maybe-send-script
   vec tramp-perl-file-attributes "tramp_perl_file_attributes")
  (tramp-send-command-and-read
   vec
   (format "tramp_perl_file_attributes %s %s"
	   (tramp-shell-quote-argument localname) id-format)))

(defun tramp-do-file-attributes-with-stat
  (vec localname &optional id-format)
  "Implement `file-attributes' for Tramp files using stat(1) command."
  (tramp-message vec 5 "file attributes with stat: %s" localname)
  (tramp-send-command-and-read
   vec
   (format
    ;; On Opsware, pdksh (which is the true name of ksh there) doesn't
    ;; parse correctly the sequence "((".  Therefore, we add a space.
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    "( (%s %s || %s -h %s) && %s -c '((\"%%N\") %%h %s %s %%Xe0 %%Ye0 %%Ze0 %%se0 \"%%A\" t %%ie0 -1)' %s || echo nil)"
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    (tramp-get-file-exists-command vec)
    (tramp-shell-quote-argument localname)
    (tramp-get-test-command vec)
    (tramp-shell-quote-argument localname)
    (tramp-get-remote-stat vec)
    (if (eq id-format 'integer) "%u" "\"%U\"")
    (if (eq id-format 'integer) "%g" "\"%G\"")
    (tramp-shell-quote-argument localname))))

1292
(defun tramp-sh-handle-set-visited-file-modtime (&optional time-list)
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  "Like `set-visited-file-modtime' for Tramp files."
  (unless (buffer-file-name)
    (error "Can't set-visited-file-modtime: buffer `%s' not visiting a file"
	   (buffer-name)))
  (if time-list
      (tramp-run-real-handler 'set-visited-file-modtime (list time-list))
    (let ((f (buffer-file-name))
	  coding-system-used)
      (with-parsed-tramp-file-name f nil
	(let* ((attr (file-attributes f))
	       ;; '(-1 65535) means file doesn't exists yet.
	       (modtime (or (nth 5 attr) '(-1 65535))))
	  (when (boundp 'last-coding-system-used)
	    (setq coding-system-used (symbol-value 'last-coding-system-used)))
	  ;; We use '(0 0) as a don't-know value.  See also
	  ;; `tramp-do-file-attributes-with-ls'.
	  (if (not (equal modtime '(0 0)))
	      (tramp-run-real-handler 'set-visited-file-modtime (list modtime))
	    (progn
	      (tramp-send-command
	       v
	       (format "%s -ild %s"
		       (tramp-get-ls-command v)
		       (tramp-shell-quote-argument localname)))
	      (setq attr (buffer-substring (point)
					   (progn (end-of-line) (point)))))
	    (tramp-set-file-property
	     v localname "visited-file-modtime-ild" attr))
	  (when (boundp 'last-coding-system-used)
	    (set 'last-coding-system-used coding-system-used))
	  nil)))))

;; This function makes the same assumption as
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;; `tramp-sh-handle-set-visited-file-modtime'.
(defun tramp-sh-handle-verify-visited-file-modtime (buf)
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  "Like `verify-visited-file-modtime' for Tramp files.
At the time `verify-visited-file-modtime' calls this function, we
already know that the buffer is visiting a file and that
`visited-file-modtime' does not return 0.  Do not call this
function directly, unless those two cases are already taken care
of."
  (with-current-buffer buf
    (let ((f (buffer-file-name)))
      ;; There is no file visiting the buffer, or the buffer has no
      ;; recorded last modification time, or there is no established
      ;; connection.
      (if (or (not f)
	      (eq (visited-file-modtime) 0)
	      (not (tramp-file-name-handler 'file-remote-p f nil 'connected)))
	  t
	(with-parsed-tramp-file-name f nil
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	  (let* ((remote-file-name-inhibit-cache t)
		 (attr (file-attributes f))
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		 (modtime (nth 5 attr))
		 (mt (visited-file-modtime)))

	    (cond
	     ;; File exists, and has a known modtime.
	     ((and attr (not (equal modtime '(0 0))))
	      (< (abs (tramp-time-diff
		       modtime
		       ;; For compatibility, deal with both the old
		       ;; (HIGH . LOW) and the new (HIGH LOW) return
		       ;; values of `visited-file-modtime'.
		       (if (atom (cdr mt))
			   (list (car mt) (cdr mt))
			 mt)))
		 2))
	     ;; Modtime has the don't know value.
	     (attr
	      (tramp-send-command
	       v
	       (format "%s -ild %s"
		       (tramp-get-ls-command v)
		       (tramp-shell-quote-argument localname)))
	      (with-current-buffer (tramp-get-buffer v)
		(setq attr (buffer-substring
			    (point) (progn (end-of-line) (point)))))
	      (equal
	       attr
	       (tramp-get-file-property
		v localname "visited-file-modtime-ild" "")))
	     ;; If file does not exist, say it is not modified if and
	     ;; only if that agrees with the buffer's record.
	     (t (equal mt '(-1 65535))))))))))

1379
(defun tramp-sh-handle-set-file-modes (filename mode)
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  "Like `set-file-modes' for Tramp files."
  (with-parsed-tramp-file-name filename nil
    (tramp-flush-file-property v localname)
    ;; FIXME: extract the proper text from chmod's stderr.
    (tramp-barf-unless-okay
     v
     (format "chmod %s %s"
	     (tramp-compat-decimal-to-octal mode)
	     (tramp-shell-quote-argument localname))
     "Error while changing file's mode %s" filename)))

1391
(defun tramp-sh-handle-set-file-times (filename &optional time)
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  "Like `set-file-times' for Tramp files."
  (if (file-remote-p filename)
      (with-parsed-tramp-file-name filename nil
	(tramp-flush-file-property v localname)
	(let ((time (if (or (null time) (equal time '(0 0)))
			(current-time)
		      time))
	      ;; With GNU Emacs, `format-time-string' has an optional
	      ;; parameter UNIVERSAL.  This is preferred, because we
	      ;; could handle the case when the remote host is located
	      ;; in a different time zone as the local host.
	      (utc (not (featurep 'xemacs))))
	  (tramp-send-command-and-check
	   v (format "%s touch -t %s %s"
		     (if utc "TZ=UTC; export TZ;" "")
		     (if utc
			 (format-time-string "%Y%m%d%H%M.%S" time t)
		       (format-time-string "%Y%m%d%H%M.%S" time))
		     (tramp-shell-quote-argument localname)))))

    ;; We handle also the local part, because in older Emacsen,
    ;; without `set-file-times', this function is an alias for this.
    ;; We are local, so we don't need the UTC settings.
    (zerop
     (tramp-compat-call-process
      "touch" nil nil nil "-t"
      (format-time-string "%Y%m%d%H%M.%S" time)
      (tramp-shell-quote-argument filename)))))

(defun tramp-set-file-uid-gid (filename &optional uid gid)
  "Set the ownership for FILENAME.
If UID and GID are provided, these values are used; otherwise uid
and gid of the corresponding user is taken.  Both parameters must be integers."
  ;; Modern Unices allow chown only for root.  So we might need
  ;; another implementation, see `dired-do-chown'.  OTOH, it is mostly
  ;; working with su(do)? when it is needed, so it shall succeed in
  ;; the majority of cases.
  ;; Don't modify `last-coding-system-used' by accident.
  (let ((last-coding-system-used last-coding-system-used))
    (if (file-remote-p filename)
	(with-parsed-tramp-file-name filename nil
	  (if (and (zerop (user-uid)) (tramp-local-host-p v))
	      ;; If we are root on the local host, we can do it directly.
	      (tramp-set-file-uid-gid localname uid gid)
	    (let ((uid (or (and (integerp uid) uid)
			   (tramp-get-remote-uid v 'integer)))
		  (gid (or (and (integerp gid) gid)
			   (tramp-get-remote-gid v 'integer))))
	      (tramp-send-command
	       v (format
		  "chown %d:%d %s" uid gid
		  (tramp-shell-quote-argument localname))))))

      ;; We handle also the local part, because there doesn't exist
      ;; `set-file-uid-gid'.  On W32 "chown" might not work.
      (let ((uid (or (and (integerp uid) uid) (tramp-get-local-uid 'integer)))
	    (gid (or (and (integerp gid) gid) (tramp-get-local-gid 'integer))))
	(tramp-compat-call-process
	 "chown" nil nil nil
         (format "%d:%d" uid gid) (tramp-shell-quote-argument filename))))))

(defun tramp-remote-selinux-p (vec)
  "Check, whether SELINUX is enabled on the remote host."
  (with-connection-property (tramp-get-connection-process vec) "selinux-p"
    (let ((result (tramp-find-executable
		   vec "getenforce" (tramp-get-remote-path vec) t t)))
      (and result
	   (string-equal
	    (tramp-send-command-and-read
	     vec (format "echo \\\"`%S`\\\"" result))
	    "Enforcing")))))

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(defun tramp-sh-handle-file-selinux-context (filename)
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  "Like `file-selinux-context' for Tramp files."
  (with-parsed-tramp-file-name filename nil
    (with-file-property v localname "file-selinux-context"
      (let ((context '(nil nil nil nil))
	    (regexp (concat "\\([a-z0-9_]+\\):" "\\([a-z0-9_]+\\):"
			    "\\([a-z0-9_]+\\):" "\\([a-z0-9_]+\\)")))
	(when (and (tramp-remote-selinux-p v)
		   (tramp-send-command-and-check
		    v (format
		       "%s -d -Z %s"
		       (tramp-get-ls-command v)
		       (tramp-shell-quote-argument localname))))
	  (with-current-buffer (tramp-get-connection-buffer v)
	    (goto-char (point-min))
1479
	    (when (re-search-forward regexp (point-at-eol) t)
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	      (setq context (list (match-string 1) (match-string 2)
				  (match-string 3) (match-string 4))))))
	;; Return the context.
	context))))

1485
(defun tramp-sh-handle-set-file-selinux-context (filename context)
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  "Like `set-file-selinux-context' for Tramp files."
  (with-parsed-tramp-file-name filename nil
    (if (and (consp context)
	     (tramp-remote-selinux-p v)
	     (tramp-send-command-and-check
	      v (format "chcon %s %s %s %s %s"
			(if (stringp (nth 0 context))
			    (format "--user=%s" (nth 0 context)) "")
			(if (stringp (nth 1 context))
			    (format "--role=%s" (nth 1 context)) "")
			(if (stringp (nth 2 context))
			    (format "--type=%s" (nth 2 context)) "")
			(if (stringp (nth 3 context))
			    (format "--range=%s" (nth 3 context)) "")
			(tramp-shell-quote-argument localname))))
	(tramp-set-file-property v localname "file-selinux-context" context)
      (tramp-set-file-property v localname "file-selinux-context" 'undef)))
  ;; We always return nil.
  nil)

;; Simple functions using the `test' command.

1508
(defun tramp-sh-handle-file-executable-p (filename)
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  "Like `file-executable-p' for Tramp files."
  (with-parsed-tramp-file-name filename nil
    (with-file-property v localname "file-executable-p"
      ;; Examine `file-attributes' cache to see if request can be
      ;; satisfied without remote operation.
      (or (tramp-check-cached-permissions v ?x)
	  (tramp-run-test "-x" filename)))))

1517
(defun tramp-sh-handle-file-readable-p (filename)
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  "Like `file-readable-p' for Tramp files."
  (with-parsed-tramp-file-name filename nil
    (with-file-property v localname "file-readable-p"
      ;; Examine `file-attributes' cache to see if request can be
      ;; satisfied without remote operation.
      (or (tramp-check-cached-permissions v ?r)
	  (tramp-run-test "-r" filename)))))

;; When the remote shell is started, it looks for a shell which groks
;; tilde expansion.  Here, we assume that all shells which grok tilde
;; expansion will also provide a `test' command which groks `-nt' (for
;; newer than).  If this breaks, tell me about it and I'll try to do
;; something smarter about it.
1531
(defun tramp-sh-handle-file-newer-than-file-p (file1 file2)
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  "Like `file-newer-than-file-p' for Tramp files."
  (cond ((not (file-exists-p file1))
         nil)
        ((not (file-exists-p file2))
         t)
        ;; We are sure both files exist at this point.
        (t
         (save-excursion
	   ;; We try to get the mtime of both files.  If they are not
	   ;; equal to the "dont-know" value, then we subtract the times
	   ;; and obtain the result.
	   (let ((fa1 (file-attributes file1))
		 (fa2 (file-attributes file2)))
	     (if (and (not (equal (nth 5 fa1) '(0 0)))
		      (not (equal (nth 5 fa2) '(0 0))))
		 (> 0 (tramp-time-diff (nth 5 fa2) (nth 5 fa1)))
	       ;; If one of them is the dont-know value, then we can
	       ;; still try to run a shell command on the remote host.
	       ;; However, this only works if both files are Tramp
	       ;; files and both have the same method, same user, same
	       ;; host.
	       (unless (tramp-equal-remote file1 file2)
		 (with-parsed-tramp-file-name
		     (if (tramp-tramp-file-p file1) file1 file2) nil
		   (tramp-error
		    v 'file-error
		    "Files %s and %s must have same method, user, host"
		    file1 file2)))
	       (with-parsed-tramp-file-name file1 nil
		 (tramp-run-test2
		  (tramp-get-test-nt-command v) file1 file2))))))))

;; Functions implemented using the basic functions above.

1566
(defun tramp-sh-handle-file-directory-p (filename)
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  "Like `file-directory-p' for Tramp files."
  ;; Care must be taken that this function returns `t' for symlinks
  ;; pointing to directories.  Surely the most obvious implementation
  ;; would be `test -d', but that returns false for such symlinks.
  ;; CCC: Stefan Monnier says that `test -d' follows symlinks.  And
  ;; I now think he's right.  So we could be using `test -d', couldn't
  ;; we?
  ;;
  ;; Alternatives: `cd %s', `test -d %s'
  (with-parsed-tramp-file-name filename nil
    (with-file-property v localname "file-directory-p"
      (tramp-run-test "-d" filename))))

1580
(defun tramp-sh-handle-file-writable-p (filename)
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  "Like `file-writable-p' for Tramp files."
  (with-parsed-tramp-file-name filename nil
    (with-file-property v localname "file-writable-p"
      (if (file-exists-p filename)
	  ;; Examine `file-attributes' cache to see if request can be
	  ;; satisfied without remote operation.
          (or (tramp-check-cached-permissions v ?w)
	      (tramp-run-test "-w" filename))
	;; If file doesn't exist, check if directory is writable.
	(and (tramp-run-test "-d" (file-name-directory filename))
	     (tramp-run-test "-w" (file-name-directory filename)))))))

1593
(defun tramp-sh-handle-file-ownership-preserved-p (filename)
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  "Like `file-ownership-preserved-p' for Tramp files."
  (with-parsed-tramp-file-name filename nil
    (with-file-property v localname "file-ownership-preserved-p"
      (let ((attributes (file-attributes filename)))
	;; Return t if the file doesn't exist, since it's true that no
	;; information would be lost by an (attempted) delete and create.
	(or (null attributes)
	    (= (nth 2 attributes) (tramp-get-remote-uid v 'integer)))))))

;; Directory listings.

1605
(defun tramp-sh-handle-directory-files-and-attributes
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  (directory &optional full match nosort id-format)
  "Like `directory-files-and-attributes' for Tramp files."
  (unless id-format (setq id-format 'integer))
  (when (file-directory-p directory)
    (setq directory (expand-file-name directory))
    (let* ((temp
	    (copy-tree
	     (with-parsed-tramp-file-name directory nil
	       (with-file-property
		   v localname
		   (format "directory-files-and-attributes-%s" id-format)
		 (save-excursion
		   (mapcar
		    (lambda (x)
		      (cons (car x)
			    (tramp-convert-file-attributes v (cdr x))))
		    (cond
		     ((tramp-get-remote-stat v)
		      (tramp-do-directory-files-and-attributes-with-stat
		       v localname id-format))
		     ((tramp-get-remote-perl v)
		      (tramp-do-directory-files-and-attributes-with-perl
		       v localname id-format)))))))))
	   result item)

      (while temp
	(setq item (pop temp))
	(when (or (null match) (string-match match (car item)))
	  (when full
	    (setcar item (expand-file-name (car item) directory)))
	  (push item result)))

      (if nosort
	  result
	(sort result (lambda (x y) (string< (car x) (car y))))))))

(defun tramp-do-directory-files-and-attributes-with-perl
  (vec localname &optional id-format)
  "Implement `directory-files-and-attributes' for Tramp files using a Perl script."
  (tramp-message vec 5 "directory-files-and-attributes with perl: %s" localname)
  (tramp-maybe-send-script
   vec tramp-perl-directory-files-and-attributes
   "tramp_perl_directory_files_and_attributes")
  (let ((object
	 (tramp-send-command-and-read
	  vec
	  (format "tramp_perl_directory_files_and_attributes %s %s"
		  (tramp-shell-quote-argument localname) id-format))))
    (when (stringp object) (tramp-error vec 'file-error object))
    object))

(defun tramp-do-directory-files-and-attributes-with-stat
  (vec localname &optional id-format)
  "Implement `directory-files-and-attributes' for Tramp files using stat(1) command."
  (tramp-message vec 5 "directory-files-and-attributes with stat: %s" localname)
  (tramp-send-command-and-read
   vec
   (format
    (concat
     ;; We must care about filenames with spaces, or starting with
     ;; "-"; this would confuse xargs.  "ls -aQ" might be a solution,
     ;; but it does not work on all remote systems.  Therefore, we
     ;; quote the filenames via sed.
     "cd %s; echo \"(\"; (%s -a | sed -e s/\\$/\\\"/g -e s/^/\\\"/g | xargs "
1670
     "%s -c '(\"%%n\" (\"%%N\") %%h %s %s %%Xe0 %%Ye0 %%Ze0 %%se0 \"%%A\" t %%ie0 -1)'); "
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     "echo \")\"")
    (tramp-shell-quote-argument localname)
    (tramp-get-ls-command vec)
    (tramp-get-remote-stat vec)
    (if (eq id-format 'integer) "%u" "\"%U\"")
    (if (eq id-format 'integer) "%g" "\"%G\""))))

;; This function should return "foo/" for directories and "bar" for
;; files.
1680
(defun tramp-sh-handle-file-name-all-completions (filename directory)
1681 1682 1683 1684 1685 1686 1687 1688 1689
  "Like `file-name-all-completions' for Tramp files."
  (unless (save-match-data (string-match "/" filename))
    (with-parsed-tramp-file-name (expand-file-name directory) nil

      (all-completions
       filename
       (mapcar
	'list
        (or
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	 ;; Try cache entries for filename, filename with last
	 ;; character removed, filename with last two characters
	 ;; removed, ..., and finally the empty string - all
	 ;; concatenated to the local directory name.
         (let ((remote-file-name-inhibit-cache
		(or remote-file-name-inhibit-cache
		    tramp-completion-reread-directory-timeout)))

	   ;; This is inefficient for very long filenames, pity
	   ;; `reduce' is not available...
	   (car
	    (apply
	     'append
	     (mapcar
	      (lambda (x)
		(let ((cache-hit
		       (tramp-get-file-property
			v
			(concat localname (substring filename 0 x))
			"file-name-all-completions"
			nil)))
		  (when cache-hit (list cache-hit))))
	      (tramp-compat-number-sequence (length filename) 0 -1)))))
1713 1714

         ;; Cache expired or no matching cache entry found so we need
1715
         ;; to perform a remote operation.
1716 1717 1718 1719 1720 1721
         (let (result)
           ;; Get a list of directories and files, including reliably
           ;; tagging the directories with a trailing '/'.  Because I
           ;; rock.  --daniel@danann.net

           ;; Changed to perform `cd' in the same remote op and only
1722
           ;; get entries starting with `filename'.  Capture any `cd'
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           ;; error messages.  Ensure any `cd' and `echo' aliases are
           ;; ignored.
           (tramp-send-command
            v
            (if (tramp-get-remote-perl v)
                (progn
                  (tramp-maybe-send-script
                   v tramp-perl-file-name-all-completions
                   "tramp_perl_file_name_all_completions")
                  (format "tramp_perl_file_name_all_completions %s %s %d"
                          (tramp-shell-quote-argument localname)
                          (tramp-shell-quote-argument filename)
                          (if (symbol-value
			       ;; `read-file-name-completion-ignore-case'
			       ;; is introduced with Emacs 22.1.
			       (if (boundp
				    'read-file-name-completion-ignore-case)
				   'read-file-name-completion-ignore-case
				 'completion-ignore-case))
			      1 0)))

              (format (concat
                       "(\\cd %s 2>&1 && (%s %s -a 2>/dev/null"
                       ;; `ls' with wildcard might fail with `Argument
                       ;; list too long' error in some corner cases; if
                       ;; `ls' fails after `cd' succeeded, chances are
                       ;; that's the case, so let's retry without
                       ;; wildcard.  This will return "too many" entries
                       ;; but that isn't harmful.
                       " || %s -a 2>/dev/null)"
                       " | while read f; do"
                       " if %s -d \"$f\" 2>/dev/null;"
                       " then \\echo \"$f/\"; else \\echo \"$f\"; fi; done"
                       " && \\echo ok) || \\echo fail")
                      (tramp-shell-quote-argument localname)
                      (tramp-get-ls-command v)
                      ;; When `filename' is empty, just `ls' without
                      ;; filename argument is more efficient than `ls *'
                      ;; for very large directories and might avoid the
                      ;; `Argument list too long' error.
                      ;;
                      ;; With and only with wildcard, we need to add
                      ;; `-d' to prevent `ls' from descending into
                      ;; sub-directories.
                      (if (zerop (length filename))
                          "."
                        (concat (tramp-shell-quote-argument filename) "* -d"))
                      (tramp-get-ls-command v)
                      (tramp-get-test-command v))))

           ;; Now grab the output.
           (with-current-buffer (tramp-get-buffer v)
             (goto-char (point-max))

             ;; Check result code, found in last line of output
             (forward-line -1)
             (if (looking-at "^fail$")
                 (progn
                   ;; Grab error message from line before last line
                   ;; (it was put there by `cd 2>&1')
                   (forward-line -1)
                   (tramp-error
                    v 'file-error
1786
                    "tramp-sh-handle-file-name-all-completions: %s"
1787
                    (buffer-substring (point) (point-at-eol))))
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               ;; For peace of mind, if buffer doesn't end in `fail'
               ;; then it should end in `ok'.  If neither are in the
               ;; buffer something went seriously wrong on the remote
               ;; side.
               (unless (looking-at "^ok$")
                 (tramp-error
                  v 'file-error
                  "\
1796
tramp-sh-handle-file-name-all-completions: internal error accessing `%s': `%s'"
1797 1798 1799
                  (tramp-shell-quote-argument localname) (buffer-string))))

             (while (zerop (forward-line -1))
1800
               (push (buffer-substring (point) (point-at-eol)) result)))
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           ;; Because the remote op went through OK we know the
           ;; directory we `cd'-ed to exists
           (tramp-set-file-property
            v localname "file-exists-p" t)

           ;; Because the remote op went through OK we know every
           ;; file listed by `ls' exists.
           (mapc (lambda (entry)
		   (tramp-set-file-property
		    v (concat localname entry) "file-exists-p" t))
		 result)

           ;; Store result in the cache
           (tramp-set-file-property
            v (concat localname filename)
            "file-name-all-completions"
            result))))))))

;; cp, mv and ln

1822
(defun tramp-sh-handle-add-name-to-file
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