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;;; tramp-gvfs.el --- Tramp access functions for GVFS daemon

;; Copyright (C) 2009-2013 Free Software Foundation, Inc.

;; Author: Michael Albinus <michael.albinus@gmx.de>
;; Keywords: comm, processes
;; Package: tramp

;; This file is part of GNU Emacs.

;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.

;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;; GNU General Public License for more details.

;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.

;;; Commentary:

;; Access functions for the GVFS daemon from Tramp.  Tested with GVFS
;; 1.0 (Ubuntu 8.10, Gnome 2.24).  It has been reported also to run
;; with GVFS 0.2.5 (Ubuntu 8.04, Gnome 2.22), but there is an
;; incompatibility with the mount_info structure, which has been
;; worked around.

;; It has also been tested with GVFS 1.6 (Ubuntu 10.04, Gnome 2.30),
;; where the default_location has been added to mount_info (see
;; <https://bugzilla.gnome.org/show_bug.cgi?id=561998>.

;; With GVFS 1.14 (Ubuntu 12.10, Gnome 3.6) the interfaces have been
;; changed, again.  So we must introspect the D-Bus interfaces.

;; All actions to mount a remote location, and to retrieve mount
;; information, are performed by D-Bus messages.  File operations
;; themselves are performed via the mounted filesystem in ~/.gvfs.
;; Consequently, GNU Emacs 23.1 with enabled D-Bus bindings is a
;; precondition.

;; The GVFS D-Bus interface is said to be unstable.  There were even
;; no introspection data before GVFS 1.14.  The interface, as
;; discovered during development time, is given in respective
;; comments.

;; The customer option `tramp-gvfs-methods' contains the list of
;; supported connection methods.  Per default, these are "dav",
;; "davs", "obex" and "synce".  Note that with "obex" it might be
;; necessary to pair with the other bluetooth device, if it hasn't
;; been done already.  There might be also some few seconds delay in
;; discovering available bluetooth devices.

;; Other possible connection methods are "ftp", "sftp" and "smb".
;; When one of these methods is added to the list, the remote access
;; for that method is performed via GVFS instead of the native Tramp
;; implementation.

;; GVFS offers even more connection methods.  The complete list of
;; connection methods of the actual GVFS implementation can be
;; retrieved by:
;;
;; (message
;;  "%s"
;;  (mapcar
;;   'car
;;   (dbus-call-method
;;    :session tramp-gvfs-service-daemon tramp-gvfs-path-mounttracker
;;    tramp-gvfs-interface-mounttracker "listMountableInfo")))

;; Note that all other connection methods are not tested, beside the
;; ones offered for customization in `tramp-gvfs-methods'.  If you
;; request an additional connection method to be supported, please
;; drop me a note.

;; For hostname completion, information is retrieved either from the
;; bluez daemon (for the "obex" method), the hal daemon (for the
;; "synce" method), or from the zeroconf daemon (for the "dav",
;; "davs", and "sftp" methods).  The zeroconf daemon is pre-configured
;; to discover services in the "local" domain.  If another domain
;; shall be used for discovering services, the customer option
;; `tramp-gvfs-zeroconf-domain' can be set accordingly.

;; Restrictions:

;; * The current GVFS implementation does not allow to write on the
;;   remote bluetooth device via OBEX.
;;
;; * Two shares of the same SMB server cannot be mounted in parallel.

;;; Code:

;; D-Bus support in the Emacs core can be disabled with configuration
;; option "--without-dbus".  Declare used subroutines and variables.
(declare-function dbus-get-unique-name "dbusbind.c")

;; Pacify byte-compiler
(eval-when-compile
  (require 'cl)
  (require 'custom))

(require 'tramp)

(require 'dbus)
(require 'url-parse)
(require 'url-util)
(require 'zeroconf)

;;;###tramp-autoload
(defcustom tramp-gvfs-methods '("dav" "davs" "obex" "synce")
  "List of methods for remote files, accessed with GVFS."
  :group 'tramp
  :version "23.2"
  :type '(repeat (choice (const "dav")
                         (const "davs")
                         (const "ftp")
                         (const "obex")
                         (const "sftp")
                         (const "smb")
                         (const "synce"))))

;; Add a default for `tramp-default-user-alist'.  Rule: For the SYNCE
;; method, no user is chosen.
;;;###tramp-autoload
(add-to-list 'tramp-default-user-alist '("\\`synce\\'" nil nil))

(defcustom tramp-gvfs-zeroconf-domain "local"
  "Zeroconf domain to be used for discovering services, like host names."
  :group 'tramp
  :version "23.2"
  :type 'string)

;; Add the methods to `tramp-methods', in order to allow minibuffer
;; completion.
;;;###tramp-autoload
(when (featurep 'dbusbind)
  (dolist (elt tramp-gvfs-methods)
    (unless (assoc elt tramp-methods)
      (add-to-list 'tramp-methods (cons elt nil)))))

(defconst tramp-gvfs-path-tramp (concat dbus-path-emacs "/Tramp")
  "The preceding object path for own objects.")

(defconst tramp-gvfs-service-daemon "org.gtk.vfs.Daemon"
  "The well known name of the GVFS daemon.")

;; Check that GVFS is available.  D-Bus integration is available since
;; Emacs 23 on some system types.  We don't call `dbus-ping', because
;; this would load dbus.el.
(unless (ignore-errors
          (and (tramp-compat-funcall 'dbus-get-unique-name :session)
               (or (tramp-compat-process-running-p "gvfs-fuse-daemon")
                   (tramp-compat-process-running-p "gvfsd-fuse"))))
  (tramp-compat-user-error "Package `tramp-gvfs' not supported"))

(defconst tramp-gvfs-path-mounttracker "/org/gtk/vfs/mounttracker"
  "The object path of the GVFS daemon.")

(defconst tramp-gvfs-interface-mounttracker "org.gtk.vfs.MountTracker"
  "The mount tracking interface in the GVFS daemon.")

;; Introspection data exist since GVFS 1.14.  If there are no such
;; data, we expect an earlier interface.
(defconst tramp-gvfs-methods-mounttracker
  (dbus-introspect-get-method-names
   :session tramp-gvfs-service-daemon tramp-gvfs-path-mounttracker
   tramp-gvfs-interface-mounttracker)
  "The list of supported methods of the mount tracking interface.")

(defconst tramp-gvfs-listmounts
  (if (member "ListMounts" tramp-gvfs-methods-mounttracker)
      "ListMounts"
    "listMounts")
  "The name of the \"listMounts\" method.
It has been changed in GVFS 1.14.")

(defconst tramp-gvfs-mountlocation
  (if (member "MountLocation" tramp-gvfs-methods-mounttracker)
      "MountLocation"
    "mountLocation")
  "The name of the \"mountLocation\" method.
It has been changed in GVFS 1.14.")

(defconst tramp-gvfs-mountlocation-signature
  (dbus-introspect-get-signature
   :session tramp-gvfs-service-daemon tramp-gvfs-path-mounttracker
   tramp-gvfs-interface-mounttracker tramp-gvfs-mountlocation)
  "The D-Bus signature of the \"mountLocation\" method.
It has been changed in GVFS 1.14.")

;; <interface name='org.gtk.vfs.MountTracker'>
;;   <method name='listMounts'>
;;     <arg name='mount_info_list'
;;          type='a{sosssssbay{aya{say}}ay}'
;;          direction='out'/>
;;   </method>
;;   <method name='mountLocation'>
;;     <arg name='mount_spec'  type='{aya{say}}' direction='in'/>
;;     <arg name='dbus_id'     type='s'          direction='in'/>
;;     <arg name='object_path' type='o'          direction='in'/>
;;   </method>
;;   <signal name='mounted'>
;;     <arg name='mount_info'
;;          type='{sosssssbay{aya{say}}ay}'/>
;;   </signal>
;;   <signal name='unmounted'>
;;     <arg name='mount_info'
;;          type='{sosssssbay{aya{say}}ay}'/>
;;   </signal>
;; </interface>
;;
;; STRUCT               mount_info
;;   STRING               dbus_id
;;   OBJECT_PATH          object_path
;;   STRING               display_name
;;   STRING               stable_name
;;   STRING               x_content_types       Since GVFS 1.0 only !!!
;;   STRING               icon
;;   STRING               preferred_filename_encoding
;;   BOOLEAN              user_visible
;;   ARRAY BYTE           fuse_mountpoint
;;   STRUCT               mount_spec
;;     ARRAY BYTE           mount_prefix
;;     ARRAY
;;       STRUCT             mount_spec_item
;;         STRING             key (server, share, type, user, host, port)
;;         ARRAY BYTE         value
;;   ARRAY BYTE           default_location      Since GVFS 1.5 only !!!

(defconst tramp-gvfs-interface-mountoperation "org.gtk.vfs.MountOperation"
  "Used by the dbus-proxying implementation of GMountOperation.")

;; <interface name='org.gtk.vfs.MountOperation'>
;;   <method name='askPassword'>
;;     <arg name='message'        type='s' direction='in'/>
;;     <arg name='default_user'   type='s' direction='in'/>
;;     <arg name='default_domain' type='s' direction='in'/>
;;     <arg name='flags'          type='u' direction='in'/>
;;     <arg name='handled'        type='b' direction='out'/>
;;     <arg name='aborted'        type='b' direction='out'/>
;;     <arg name='password'       type='s' direction='out'/>
;;     <arg name='username'       type='s' direction='out'/>
;;     <arg name='domain'         type='s' direction='out'/>
;;     <arg name='anonymous'      type='b' direction='out'/>
;;     <arg name='password_save'  type='u' direction='out'/>
;;   </method>
;;   <method name='askQuestion'>
;;     <arg name='message' type='s'  direction='in'/>
;;     <arg name='choices' type='as' direction='in'/>
;;     <arg name='handled' type='b'  direction='out'/>
;;     <arg name='aborted' type='b'  direction='out'/>
;;     <arg name='choice'  type='u'  direction='out'/>
;;   </method>
;; </interface>

;; The following flags are used in "askPassword".  They are defined in
;; /usr/include/glib-2.0/gio/gioenums.h.

(defconst tramp-gvfs-password-need-password 1
  "Operation requires a password.")

(defconst tramp-gvfs-password-need-username 2
  "Operation requires a username.")

(defconst tramp-gvfs-password-need-domain 4
  "Operation requires a domain.")

(defconst tramp-gvfs-password-saving-supported 8
  "Operation supports saving settings.")

(defconst tramp-gvfs-password-anonymous-supported 16
  "Operation supports anonymous users.")

(defconst tramp-bluez-service "org.bluez"
  "The well known name of the BLUEZ service.")

(defconst tramp-bluez-interface-manager "org.bluez.Manager"
  "The manager interface of the BLUEZ daemon.")

;; <interface name='org.bluez.Manager'>
;;   <method name='DefaultAdapter'>
;;     <arg type='o' direction='out'/>
;;   </method>
;;   <method name='FindAdapter'>
;;     <arg type='s' direction='in'/>
;;     <arg type='o' direction='out'/>
;;   </method>
;;   <method name='ListAdapters'>
;;     <arg type='ao' direction='out'/>
;;   </method>
;;   <signal name='AdapterAdded'>
;;     <arg type='o'/>
;;   </signal>
;;   <signal name='AdapterRemoved'>
;;     <arg type='o'/>
;;   </signal>
;;   <signal name='DefaultAdapterChanged'>
;;     <arg type='o'/>
;;   </signal>
;; </interface>

(defconst tramp-bluez-interface-adapter "org.bluez.Adapter"
  "The adapter interface of the BLUEZ daemon.")

;; <interface name='org.bluez.Adapter'>
;;   <method name='GetProperties'>
;;     <arg type='a{sv}' direction='out'/>
;;   </method>
;;   <method name='SetProperty'>
;;     <arg type='s' direction='in'/>
;;     <arg type='v' direction='in'/>
;;   </method>
;;   <method name='RequestMode'>
;;     <arg type='s' direction='in'/>
;;   </method>
;;   <method name='ReleaseMode'/>
;;   <method name='RequestSession'/>
;;   <method name='ReleaseSession'/>
;;   <method name='StartDiscovery'/>
;;   <method name='StopDiscovery'/>
;;   <method name='ListDevices'>
;;     <arg type='ao' direction='out'/>
;;   </method>
;;   <method name='CreateDevice'>
;;     <arg type='s' direction='in'/>
;;     <arg type='o' direction='out'/>
;;   </method>
;;   <method name='CreatePairedDevice'>
;;     <arg type='s' direction='in'/>
;;     <arg type='o' direction='in'/>
;;     <arg type='s' direction='in'/>
;;     <arg type='o' direction='out'/>
;;   </method>
;;   <method name='CancelDeviceCreation'>
;;     <arg type='s' direction='in'/>
;;   </method>
;;   <method name='RemoveDevice'>
;;     <arg type='o' direction='in'/>
;;   </method>
;;   <method name='FindDevice'>
;;     <arg type='s' direction='in'/>
;;     <arg type='o' direction='out'/>
;;   </method>
;;   <method name='RegisterAgent'>
;;     <arg type='o' direction='in'/>
;;     <arg type='s' direction='in'/>
;;   </method>
;;   <method name='UnregisterAgent'>
;;     <arg type='o' direction='in'/>
;;   </method>
;;   <signal name='DeviceCreated'>
;;     <arg type='o'/>
;;   </signal>
;;   <signal name='DeviceRemoved'>
;;     <arg type='o'/>
;;   </signal>
;;   <signal name='DeviceFound'>
;;     <arg type='s'/>
;;     <arg type='a{sv}'/>
;;   </signal>
;;   <signal name='PropertyChanged'>
;;     <arg type='s'/>
;;     <arg type='v'/>
;;   </signal>
;;   <signal name='DeviceDisappeared'>
;;     <arg type='s'/>
;;   </signal>
;; </interface>

(defcustom tramp-bluez-discover-devices-timeout 60
  "Defines seconds since last bluetooth device discovery before rescanning.
A value of 0 would require an immediate discovery during hostname
completion, nil means to use always cached values for discovered
devices."
  :group 'tramp
  :version "23.2"
  :type '(choice (const nil) integer))

(defvar tramp-bluez-discovery nil
  "Indicator for a running bluetooth device discovery.
It keeps the timestamp of last discovery.")

(defvar tramp-bluez-devices nil
  "Alist of detected bluetooth devices.
Every entry is a list (NAME ADDRESS).")

(defconst tramp-hal-service "org.freedesktop.Hal"
  "The well known name of the HAL service.")

(defconst tramp-hal-path-manager "/org/freedesktop/Hal/Manager"
  "The object path of the HAL daemon manager.")

(defconst tramp-hal-interface-manager "org.freedesktop.Hal.Manager"
  "The manager interface of the HAL daemon.")

(defconst tramp-hal-interface-device "org.freedesktop.Hal.Device"
  "The device interface of the HAL daemon.")

\f
;; New handlers should be added here.
(defconst tramp-gvfs-file-name-handler-alist
  '(
    (access-file . ignore)
    (add-name-to-file . tramp-gvfs-handle-copy-file)
    ;; `byte-compiler-base-file-name' performed by default handler.
    (copy-file . tramp-gvfs-handle-copy-file)
    (delete-directory . tramp-gvfs-handle-delete-directory)
    (delete-file . tramp-gvfs-handle-delete-file)
    ;; `diff-latest-backup-file' performed by default handler.
    (directory-file-name . tramp-handle-directory-file-name)
    (directory-files . tramp-handle-directory-files)
    (directory-files-and-attributes
     . tramp-handle-directory-files-and-attributes)
    (dired-call-process . ignore)
    (dired-compress-file . ignore)
    (dired-uncache . tramp-handle-dired-uncache)
    ;; `executable-find' is not official yet. performed by default handler.
    (expand-file-name . tramp-gvfs-handle-expand-file-name)
    (file-accessible-directory-p . tramp-handle-file-accessible-directory-p)
    (file-acl . ignore)
    (file-attributes . tramp-gvfs-handle-file-attributes)
    (file-directory-p . tramp-gvfs-handle-file-directory-p)
    (file-executable-p . tramp-gvfs-handle-file-executable-p)
    (file-exists-p . tramp-handle-file-exists-p)
    (file-local-copy . tramp-gvfs-handle-file-local-copy)
    (file-modes . tramp-handle-file-modes)
    (file-name-all-completions . tramp-gvfs-handle-file-name-all-completions)
    (file-name-as-directory . tramp-handle-file-name-as-directory)
    (file-name-completion . tramp-handle-file-name-completion)
    (file-name-directory . tramp-handle-file-name-directory)
    (file-name-nondirectory . tramp-handle-file-name-nondirectory)
    ;; `file-name-sans-versions' performed by default handler.
    (file-newer-than-file-p . tramp-handle-file-newer-than-file-p)
    (file-ownership-preserved-p . ignore)
    (file-readable-p . tramp-gvfs-handle-file-readable-p)
    (file-regular-p . tramp-handle-file-regular-p)
    (file-remote-p . tramp-handle-file-remote-p)
    (file-selinux-context . ignore)
    (file-symlink-p . tramp-handle-file-symlink-p)
    ;; `file-truename' performed by default handler.
    (file-writable-p . tramp-gvfs-handle-file-writable-p)
    (find-backup-file-name . tramp-handle-find-backup-file-name)
    ;; `find-file-noselect' performed by default handler.
    ;; `get-file-buffer' performed by default handler.
    (insert-directory . tramp-gvfs-handle-insert-directory)
    (insert-file-contents . tramp-gvfs-handle-insert-file-contents)
    (load . tramp-handle-load)
    (make-directory . tramp-gvfs-handle-make-directory)
    (make-directory-internal . ignore)
    (make-symbolic-link . ignore)
    (process-file . ignore)
    (rename-file . tramp-gvfs-handle-rename-file)
    (set-file-acl . ignore)
    (set-file-modes . ignore)
    (set-file-selinux-context . ignore)
    (set-visited-file-modtime . tramp-gvfs-handle-set-visited-file-modtime)
    (shell-command . ignore)
    (start-file-process . ignore)
    (substitute-in-file-name . tramp-handle-substitute-in-file-name)
    (unhandled-file-name-directory . tramp-handle-unhandled-file-name-directory)
    (vc-registered . ignore)
    ;; `verify-visited-file-modtime' performed by default handler.
    (write-region . tramp-gvfs-handle-write-region)
)
  "Alist of handler functions for Tramp GVFS method.
Operations not mentioned here will be handled by the default Emacs primitives.")

;; It must be a `defsubst' in order to push the whole code into
;; tramp-loaddefs.el.  Otherwise, there would be recursive autoloading.
;;;###tramp-autoload
(defsubst tramp-gvfs-file-name-p (filename)
  "Check if it's a filename handled by the GVFS daemon."
  (and (tramp-tramp-file-p filename)
       (let ((method
              (tramp-file-name-method (tramp-dissect-file-name filename))))
         (and (stringp method) (member method tramp-gvfs-methods)))))

;;;###tramp-autoload
(defun tramp-gvfs-file-name-handler (operation &rest args)
  "Invoke the GVFS related OPERATION.
First arg specifies the OPERATION, second arg is a list of arguments to
pass to the OPERATION."
  (let ((fn (assoc operation tramp-gvfs-file-name-handler-alist)))
    (if fn
        (save-match-data (apply (cdr fn) args))
      (tramp-run-real-handler operation args))))

;; This might be moved to tramp.el.  It shall be the first file name
;; handler.
;;;###tramp-autoload
(when (featurep 'dbusbind)
  (add-to-list 'tramp-foreign-file-name-handler-alist
               (cons 'tramp-gvfs-file-name-p 'tramp-gvfs-file-name-handler)))

\f
;; D-Bus helper function.

(defun tramp-gvfs-dbus-string-to-byte-array (string)
  "Like `dbus-string-to-byte-array' but add trailing \\0 if needed."
  (dbus-string-to-byte-array
   (if (string-match "^(aya{sv})" tramp-gvfs-mountlocation-signature)
       (concat string (string 0)) string)))

(defun tramp-gvfs-dbus-byte-array-to-string (byte-array)
  "Like `dbus-byte-array-to-string' but remove trailing \\0 if exists."
  ;; The byte array could be a variant.  Take care.
  (let ((byte-array
         (if (and (consp byte-array) (atom (car byte-array)))
             byte-array (car byte-array))))
    (dbus-byte-array-to-string
     (if (and (consp byte-array) (zerop (car (last byte-array))))
         (butlast byte-array) byte-array))))

(defun tramp-gvfs-stringify-dbus-message (message)
  "Convert a D-Bus message into readable UTF8 strings, used for traces."
  (cond
   ((and (consp message) (characterp (car message)))
    (format "%S" (tramp-gvfs-dbus-byte-array-to-string message)))
   ((consp message)
    (mapcar 'tramp-gvfs-stringify-dbus-message message))
   ((stringp message)
    (format "%S" message))
   (t message)))

(defmacro with-tramp-dbus-call-method
  (vec synchronous bus service path interface method &rest args)
  "Apply a D-Bus call on bus BUS.

If SYNCHRONOUS is non-nil, the call is synchronously.  Otherwise,
it is an asynchronous call, with `ignore' as callback function.

The other arguments have the same meaning as with `dbus-call-method'
or `dbus-call-method-asynchronously'.  Additionally, the call
will be traced by Tramp with trace level 6."
  `(let ((func (if ,synchronous
                   'dbus-call-method 'dbus-call-method-asynchronously))
         (args (append (list ,bus ,service ,path ,interface ,method)
                       (if ,synchronous (list ,@args) (list 'ignore ,@args))))
         result)
     (tramp-message ,vec 6 "%s %s" func args)
     (setq result (apply func args))
     (tramp-message ,vec 6 "%s" (tramp-gvfs-stringify-dbus-message result))
     result))

(put 'with-tramp-dbus-call-method 'lisp-indent-function 2)
(put 'with-tramp-dbus-call-method 'edebug-form-spec '(form symbolp body))
(tramp-compat-font-lock-add-keywords
 'emacs-lisp-mode '("\\<with-tramp-dbus-call-method\\>"))

(defmacro with-tramp-gvfs-error-message (filename handler &rest args)
  "Apply a Tramp GVFS `handler'.
In case of an error, modify the error message by replacing
`filename' with its GVFS mounted name."
  `(let ((fuse-file-name  (regexp-quote (tramp-gvfs-fuse-file-name ,filename)))
         elt)
     (condition-case err
         (tramp-compat-funcall ,handler ,@args)
       (error
        (setq elt (cdr err))
        (while elt
          (when (and (stringp (car elt))
                     (string-match fuse-file-name (car elt)))
            (setcar elt (replace-match ,filename t t (car elt))))
          (setq elt (cdr elt)))
        (signal (car err) (cdr err))))))

(put 'with-tramp-gvfs-error-message 'lisp-indent-function 2)
(put 'with-tramp-gvfs-error-message 'edebug-form-spec '(form symbolp body))
(tramp-compat-font-lock-add-keywords
 'emacs-lisp-mode '("\\<with-tramp-gvfs-error-message\\>"))

(defvar tramp-gvfs-dbus-event-vector nil
  "Current Tramp file name to be used, as vector.
It is needed when D-Bus signals or errors arrive, because there
is no information where to trace the message.")

(defun tramp-gvfs-dbus-event-error (event err)
  "Called when a D-Bus error message arrives, see `dbus-event-error-functions'."
  (when tramp-gvfs-dbus-event-vector
    (tramp-message tramp-gvfs-dbus-event-vector 10 "%S" event)
    (tramp-error tramp-gvfs-dbus-event-vector 'file-error "%s" (cadr err))))

;; `dbus-event-error-hooks' has been renamed to `dbus-event-error-functions'.
(add-hook
 (if (boundp 'dbus-event-error-functions)
     'dbus-event-error-functions 'dbus-event-error-hooks)
 'tramp-gvfs-dbus-event-error)

\f
;; File name primitives.

(defun tramp-gvfs-handle-copy-file
  (filename newname &optional ok-if-already-exists keep-date
            preserve-uid-gid preserve-extended-attributes)
  "Like `copy-file' for Tramp files."
  (with-parsed-tramp-file-name
      (if (tramp-tramp-file-p filename) filename newname) nil

    (when (and (not ok-if-already-exists) (file-exists-p newname))
      (tramp-error
       v 'file-already-exists "File %s already exists" newname))

    (if (or (and (tramp-tramp-file-p filename)
                 (not (tramp-gvfs-file-name-p filename)))
            (and (tramp-tramp-file-p newname)
                 (not (tramp-gvfs-file-name-p newname))))

        ;; We cannot copy directly.
        (let ((tmpfile (tramp-compat-make-temp-file filename)))
          (cond
           (preserve-extended-attributes
            (copy-file
             filename tmpfile t keep-date preserve-uid-gid
             preserve-extended-attributes))
           (preserve-uid-gid
            (copy-file filename tmpfile t keep-date preserve-uid-gid))
           (t
            (copy-file filename tmpfile t keep-date)))
          (rename-file tmpfile newname ok-if-already-exists))

      ;; Direct copy.
      (with-tramp-progress-reporter
          v 0 (format "Copying %s to %s" filename newname)
        (unless
            (let ((args
                   (append (if (or keep-date preserve-uid-gid)
                               (list "--preserve")
                             nil)
                           (list
                            (tramp-gvfs-url-file-name filename)
                            (tramp-gvfs-url-file-name newname)))))
              (apply 'tramp-gvfs-send-command v "gvfs-copy" args))
          ;; Propagate the error.
          (with-current-buffer (tramp-get-connection-buffer v)
            (goto-char (point-min))
            (tramp-error-with-buffer
             nil v 'file-error
             "Copying failed, see buffer `%s' for details." (buffer-name)))))

      (when (file-remote-p newname)
        (with-parsed-tramp-file-name newname nil
          (tramp-flush-file-property v (file-name-directory localname))
          (tramp-flush-file-property v localname))))))

(defun tramp-gvfs-handle-delete-directory (directory &optional recursive trash)
  "Like `delete-directory' for Tramp files."
  (when (and recursive (not (file-symlink-p directory)))
    (mapc (lambda (file)
            (if (eq t (car (file-attributes file)))
                (tramp-compat-delete-directory file recursive trash)
              (tramp-compat-delete-file file trash)))
          (directory-files
           directory 'full "^\\([^.]\\|\\.\\([^.]\\|\\..\\)\\).*")))
  (with-parsed-tramp-file-name directory nil
    (tramp-flush-file-property v (file-name-directory localname))
    (tramp-flush-directory-property v localname)
    (unless
        (tramp-gvfs-send-command
         v (if (and trash delete-by-moving-to-trash) "gvfs-trash" "gvfs-rm")
         (tramp-gvfs-url-file-name directory))
      ;; Propagate the error.
      (with-current-buffer (tramp-get-connection-buffer v)
        (goto-char (point-min))
        (tramp-error-with-buffer
         nil v 'file-error "Couldn't delete %s" directory)))))

(defun tramp-gvfs-handle-delete-file (filename &optional trash)
  "Like `delete-file' for Tramp files."
  (with-parsed-tramp-file-name filename nil
    (tramp-flush-file-property v (file-name-directory localname))
    (tramp-flush-directory-property v localname)
    (unless
        (tramp-gvfs-send-command
         v (if (and trash delete-by-moving-to-trash) "gvfs-trash" "gvfs-rm")
         (tramp-gvfs-url-file-name filename))
      ;; Propagate the error.
      (with-current-buffer (tramp-get-connection-buffer v)
        (goto-char (point-min))
        (tramp-error-with-buffer
         nil v 'file-error "Couldn't delete %s" filename)))))

(defun tramp-gvfs-handle-expand-file-name (name &optional dir)
  "Like `expand-file-name' for Tramp files."
  ;; If DIR is not given, use DEFAULT-DIRECTORY or "/".
  (setq dir (or dir default-directory "/"))
  ;; Unless NAME is absolute, concat DIR and NAME.
  (unless (file-name-absolute-p name)
    (setq name (concat (file-name-as-directory dir) name)))
  ;; If NAME is not a Tramp file, run the real handler.
  (if (not (tramp-tramp-file-p name))
      (tramp-run-real-handler 'expand-file-name (list name nil))
    ;; Dissect NAME.
    (with-parsed-tramp-file-name name nil
      ;; If there is a default location, expand tilde.
      (when (string-match "\\`\\(~\\)\\(/\\|\\'\\)" localname)
        (save-match-data
          (tramp-gvfs-maybe-open-connection (vector method user host "/" hop)))
        (setq localname
              (replace-match
               (tramp-get-file-property  v "/" "default-location" "~")
               nil t localname 1)))
      ;; Tilde expansion is not possible.
      (when (string-match "\\`\\(~[^/]*\\)\\(.*\\)\\'" localname)
        (tramp-error
         v 'file-error
         "Cannot expand tilde in file `%s'" name))
      (unless (tramp-run-real-handler 'file-name-absolute-p (list localname))
        (setq localname (concat "/" localname)))
      ;; We do not pass "/..".
      (if (string-equal "smb" method)
          (when (string-match "^/[^/]+\\(/\\.\\./?\\)" localname)
            (setq localname (replace-match "/" t t localname 1)))
        (when (string-match "^/\\.\\./?" localname)
          (setq localname (replace-match "/" t t localname))))
      ;; There might be a double slash.  Remove this.
      (while (string-match "//" localname)
        (setq localname (replace-match "/" t t localname)))
      ;; No tilde characters in file name, do normal
      ;; `expand-file-name' (this does "/./" and "/../").
      (tramp-make-tramp-file-name
       method user host
       (tramp-run-real-handler
        'expand-file-name (list localname))))))

(defun tramp-gvfs-handle-file-attributes (filename &optional id-format)
  "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)
        dirp res-symlink-target res-numlinks res-uid res-gid res-access
        res-mod res-change res-size res-filemodes res-inode res-device)
    (with-parsed-tramp-file-name filename nil
      (with-tramp-file-property
          v localname (format "file-attributes-%s" id-format)
        (tramp-message v 5 "file attributes: %s" localname)
        (tramp-gvfs-send-command
         v "gvfs-info" (tramp-gvfs-url-file-name filename))
        ;; Parse output ...
        (with-current-buffer (tramp-get-connection-buffer v)
          (goto-char (point-min))
          (when (re-search-forward "attributes:" nil t)
            ;; ... directory or symlink
            (goto-char (point-min))
            (setq dirp (if (re-search-forward "type:\\s-+directory" nil t) t))
            (goto-char (point-min))
            (setq res-symlink-target
                  (if (re-search-forward
                       "standard::symlink-target:\\s-+\\(\\S-+\\)" nil t)
                      (match-string 1)))
            ;; ... number links
            (goto-char (point-min))
            (setq res-numlinks
                  (if (re-search-forward "unix::nlink:\\s-+\\([0-9]+\\)" nil t)
                      (string-to-number (match-string 1)) 0))
            ;; ... uid and gid
            (goto-char (point-min))
            (setq res-uid
                  (or (if (eq id-format 'integer)
                          (if (re-search-forward
                               "unix::uid:\\s-+\\([0-9]+\\)" nil t)
                              (string-to-number (match-string 1)))
                        (if (re-search-forward
                             "owner::user:\\s-+\\(\\S-+\\)" nil t)
                            (match-string 1)))
                      (tramp-get-local-uid id-format)))
            (setq res-gid
                  (or (if (eq id-format 'integer)
                          (if (re-search-forward
                               "unix::gid:\\s-+\\([0-9]+\\)" nil t)
                              (string-to-number (match-string 1)))
                        (if (re-search-forward
                             "owner::group:\\s-+\\(\\S-+\\)" nil t)
                            (match-string 1)))
                      (tramp-get-local-gid id-format)))
            ;; ... last access, modification and change time
            (goto-char (point-min))
            (setq res-access
                  (if (re-search-forward
                       "time::access:\\s-+\\([0-9]+\\)" nil t)
                      (seconds-to-time (string-to-number (match-string 1)))
                    '(0 0)))
            (goto-char (point-min))
            (setq res-mod
                  (if (re-search-forward
                       "time::modified:\\s-+\\([0-9]+\\)" nil t)
                      (seconds-to-time (string-to-number (match-string 1)))
                    '(0 0)))
            (goto-char (point-min))
            (setq res-change
                  (if (re-search-forward
                       "time::changed:\\s-+\\([0-9]+\\)" nil t)
                      (seconds-to-time (string-to-number (match-string 1)))
                    '(0 0)))
            ;; ... size
            (goto-char (point-min))
            (setq res-size
                  (if (re-search-forward
                       "standard::size:\\s-+\\([0-9]+\\)" nil t)
                      (string-to-number (match-string 1)) 0))
            ;; ... file mode flags
            (goto-char (point-min))
            (setq res-filemodes
                  (if (re-search-forward "unix::mode:\\s-+\\([0-9]+\\)" nil t)
                      (tramp-file-mode-from-int (match-string 1))
                    (if dirp "drwx------" "-rwx------")))
            ;; ... inode and device
            (goto-char (point-min))
            (setq res-inode
                  (if (re-search-forward "unix::inode:\\s-+\\([0-9]+\\)" nil t)
                      (string-to-number (match-string 1))
                    (tramp-get-inode v)))
            (goto-char (point-min))
            (setq res-device
                  (if (re-search-forward "unix::device:\\s-+\\([0-9]+\\)" nil t)
                      (string-to-number (match-string 1))
                    (tramp-get-device v)))

            ;; 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 integers.
             ;; 5. Last modification time, likewise.
             ;; 6. Last status change time, likewise.
             res-access res-mod res-change
             ;; 7. Size in bytes (-1, if number is out of range).
             res-size
             ;; 8. File modes.
             res-filemodes
             ;; 9. t if file's gid would change if file were deleted
             ;; and recreated.
             nil
             ;; 10. Inode number.
             res-inode
             ;; 11. Device number.
             res-device
             )))))))

(defun tramp-gvfs-handle-file-directory-p (filename)
  "Like `file-directory-p' for Tramp files."
  (eq t (car (file-attributes filename))))

(defun tramp-gvfs-handle-file-executable-p (filename)
  "Like `file-executable-p' for Tramp files."
  (with-parsed-tramp-file-name filename nil
    (with-tramp-file-property v localname "file-executable-p"
      (tramp-check-cached-permissions v ?x))))

(defun tramp-gvfs-handle-file-local-copy (filename)
  "Like `file-local-copy' for Tramp files."
  (with-parsed-tramp-file-name filename nil
    (let ((tmpfile (tramp-compat-make-temp-file filename)))
      (unless (file-exists-p filename)
        (tramp-error
         v 'file-error
         "Cannot make local copy of non-existing file `%s'" filename))
      (copy-file filename tmpfile t t)
      tmpfile)))

(defun tramp-gvfs-handle-file-name-all-completions (filename directory)
  "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
         ;; 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))))
              ;; We cannot use a length of 0, because file properties
              ;; for "foo" and "foo/" are identical.
              (tramp-compat-number-sequence (length filename) 1 -1)))))

         ;; Cache expired or no matching cache entry found so we need
         ;; to perform a remote operation.
         (let ((result '("." ".."))
               entry)
           ;; Get a list of directories and files.
           (tramp-gvfs-send-command
            v "gvfs-ls" (tramp-gvfs-url-file-name directory))

           ;; Now grab the output.
           (with-temp-buffer
             (insert-buffer-substring (tramp-get-connection-buffer v))
             (goto-char (point-max))
             (while (zerop (forward-line -1))
               (setq entry (buffer-substring (point) (point-at-eol)))
               (when (string-match filename entry)
                 (if (file-directory-p (expand-file-name entry directory))
                     (push (concat entry "/") result)
                   (push entry result)))))

           ;; 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))))))))

(defun tramp-gvfs-handle-file-readable-p (filename)
  "Like `file-readable-p' for Tramp files."
  (with-parsed-tramp-file-name filename nil
    (with-tramp-file-property v localname "file-executable-p"
      (tramp-check-cached-permissions v ?r))))

(defun tramp-gvfs-handle-file-writable-p (filename)
  "Like `file-writable-p' for Tramp files."
  (with-parsed-tramp-file-name filename nil
    (with-tramp-file-property v localname "file-writable-p"
      (if (file-exists-p filename)
          (tramp-check-cached-permissions v ?w)
        ;; If file doesn't exist, check if directory is writable.
        (and (file-directory-p (file-name-directory filename))
             (file-writable-p (file-name-directory filename)))))))

(defun tramp-gvfs-handle-insert-directory
  (filename switches &optional wildcard full-directory-p)
  "Like `insert-directory' for Tramp files."
  ;; gvfs-* output is hard to parse.  So we let `ls-lisp' do the job.
  (with-parsed-tramp-file-name (expand-file-name filename) nil
    (with-tramp-progress-reporter v 0 (format "Opening directory %s" filename)
      (require 'ls-lisp)
      (let (ls-lisp-use-insert-directory-program)
        (tramp-run-real-handler
         'insert-directory
         (list filename switches wildcard full-directory-p))))))

(defun tramp-gvfs-handle-insert-file-contents
  (filename &optional visit beg end replace)
  "Like `insert-file-contents' for Tramp files."
  (barf-if-buffer-read-only)
  (setq filename (expand-file-name filename))
  (let (tmpfile result)
    (unwind-protect
        (if (not (file-exists-p filename))
            ;; We don't raise a Tramp error, because it might be
            ;; suppressed, like in `find-file-noselect-1'.
            (signal 'file-error (list "File not found on remote host" filename))

          (setq tmpfile (file-local-copy filename)
                result (insert-file-contents tmpfile visit beg end replace)))
      ;; Save exit.
      (when visit
        (setq buffer-file-name filename)
        (setq buffer-read-only (not (file-writable-p filename)))
        (set-visited-file-modtime)
        (set-buffer-modified-p nil))
      (when (stringp tmpfile)
        (delete-file tmpfile)))

    ;; Result.
    (list filename (cadr result))))

(defun tramp-gvfs-handle-make-directory (dir &optional parents)
  "Like `make-directory' for Tramp files."
  (with-parsed-tramp-file-name dir nil
    (unless
        (apply
         'tramp-gvfs-send-command v "gvfs-mkdir"
         (if parents
             (list "-p" (tramp-gvfs-url-file-name dir))
           (list (tramp-gvfs-url-file-name dir))))
      ;; Propagate the error.
      (tramp-error v 'file-error "Couldn't make directory %s" dir))))

(defun tramp-gvfs-handle-rename-file
  (filename newname &optional ok-if-already-exists)
  "Like `rename-file' for Tramp files."
  (with-parsed-tramp-file-name
      (if (tramp-tramp-file-p filename) filename newname) nil

    (when (and (not ok-if-already-exists) (file-exists-p newname))
      (tramp-error
       v 'file-already-exists "File %s already exists" newname))

    (if (or (and (tramp-tramp-file-p filename)
                 (not (tramp-gvfs-file-name-p filename)))
            (and (tramp-tramp-file-p newname)
                 (not (tramp-gvfs-file-name-p newname))))

        ;; We cannot move directly.
        (let ((tmpfile (tramp-compat-make-temp-file filename)))
          (rename-file filename tmpfile t)
          (rename-file tmpfile newname ok-if-already-exists))

      ;; Direct move.
      (with-tramp-progress-reporter
          v 0 (format "Renaming %s to %s" filename newname)
        (unless
            (tramp-gvfs-send-command
             v "gvfs-move"
             (tramp-gvfs-url-file-name filename)
             (tramp-gvfs-url-file-name newname))
          ;; Propagate the error.
          (with-current-buffer (tramp-get-buffer v)
            (goto-char (point-min))
            (tramp-error-with-buffer
             nil v 'file-error
             "Renaming failed, see buffer `%s' for details." (buffer-name)))))

      (when (file-remote-p filename)
        (with-parsed-tramp-file-name filename nil
          (tramp-flush-file-property v (file-name-directory localname))
          (tramp-flush-file-property v localname)))

      (when (file-remote-p newname)
        (with-parsed-tramp-file-name newname nil
          (tramp-flush-file-property v (file-name-directory localname))
          (tramp-flush-file-property v localname))))))

(defun tramp-gvfs-handle-set-visited-file-modtime (&optional time-list)
  "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)))
  (unless time-list
    (let ((f (buffer-file-name)))
      (with-parsed-tramp-file-name f nil
        (let ((remote-file-name-inhibit-cache t)
              (attr (file-attributes f)))
          ;; '(-1 65535) means file doesn't exists yet.
          (setq time-list (or (nth 5 attr) '(-1 65535)))))))
  ;; We use '(0 0) as a don't-know value.
  (unless (not (equal time-list '(0 0)))
    (tramp-run-real-handler 'set-visited-file-modtime (list time-list))))

(defun tramp-gvfs-handle-write-region
  (start end filename &optional append visit lockname confirm)
  "Like `write-region' for Tramp files."
  (with-parsed-tramp-file-name filename nil
    ;; XEmacs takes a coding system as the seventh argument, not `confirm'.
    (when (and (not (featurep 'xemacs)) confirm (file-exists-p filename))
      (unless (y-or-n-p (format "File %s exists; overwrite anyway? " filename))
        (tramp-error v 'file-error "File not overwritten")))

    (let ((tmpfile (tramp-compat-make-temp-file filename)))
      (write-region start end tmpfile)
      (condition-case nil
          (rename-file tmpfile filename)
        (error
         (delete-file tmpfile)
         (tramp-error
          v 'file-error "Couldn't write region to `%s'" filename))))

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

    ;; Set file modification time.
    (when (or (eq visit t) (stringp visit))
      (set-visited-file-modtime (nth 5 (file-attributes filename))))

    ;; The end.
    (when (or (eq visit t) (null visit) (stringp visit))
      (tramp-message v 0 "Wrote %s" filename))
    (run-hooks 'tramp-handle-write-region-hook)))

\f
;; File name conversions.

(defun tramp-gvfs-url-file-name (filename)
  "Return FILENAME in URL syntax."
  ;; "/" must NOT be hexlified.
  (let ((url-unreserved-chars (append '(?/) url-unreserved-chars))
        result)
    (setq
     result
     (url-recreate-url
      (if (tramp-tramp-file-p filename)
          (with-parsed-tramp-file-name filename nil
            (when (and user (string-match tramp-user-with-domain-regexp user))
              (setq user
                    (concat (match-string 2 user) ";" (match-string 1 user))))
            (url-parse-make-urlobj
             method (url-hexify-string user) nil
             (tramp-file-name-real-host v) (tramp-file-name-port v)
             (url-hexify-string localname) nil nil t))
        (url-parse-make-urlobj
         "file" nil nil nil nil
         (url-hexify-string (file-truename filename)) nil nil t))))
    (when (tramp-tramp-file-p filename)
      (with-parsed-tramp-file-name filename nil
        (tramp-message v 10 "remote file `%s' is URL `%s'" filename result)))
    result))

(defun tramp-gvfs-object-path (filename)
  "Create a D-Bus object path from FILENAME."
  (expand-file-name (dbus-escape-as-identifier filename) tramp-gvfs-path-tramp))

(defun tramp-gvfs-file-name (object-path)
  "Retrieve file name from D-Bus OBJECT-PATH."
  (dbus-unescape-from-identifier
   (replace-regexp-in-string "^.*/\\([^/]+\\)$" "\\1" object-path)))

(defun tramp-gvfs-fuse-file-name (filename)
  "Return FUSE file name, which is directly accessible."
  (with-parsed-tramp-file-name (expand-file-name filename) nil
    (tramp-gvfs-maybe-open-connection v)
    (let ((prefix (tramp-get-file-property v "/" "prefix" ""))
          (fuse-mountpoint
           (tramp-get-file-property v "/" "fuse-mountpoint" nil)))
      (unless fuse-mountpoint
        (tramp-error
         v 'file-error "There is no FUSE mount point for `%s'" filename))
      ;; We must hide the prefix, if any.
      (when (string-match (concat "^" (regexp-quote prefix)) localname)
        (setq localname (replace-match "" t t localname)))
      (tramp-message
       v 10 "remote file `%s' is local file `%s'"
       filename (concat fuse-mountpoint localname))
      (concat fuse-mountpoint localname))))

(defun tramp-bluez-address (device)
  "Return bluetooth device address from a given bluetooth DEVICE name."
  (when (stringp device)
    (if (string-match tramp-ipv6-regexp device)
        (match-string 0 device)
      (cadr (assoc device (tramp-bluez-list-devices))))))

(defun tramp-bluez-device (address)
  "Return bluetooth device name from a given bluetooth device ADDRESS.
ADDRESS can have the form \"xx:xx:xx:xx:xx:xx\" or \"[xx:xx:xx:xx:xx:xx]\"."
  (when (stringp address)
    (while (string-match "[][]" address)
      (setq address (replace-match "" t t address)))
    (let (result)
      (dolist (item (tramp-bluez-list-devices) result)
        (when (string-match address (cadr item))
          (setq result (car item)))))))

\f
;; D-Bus GVFS functions.

(defun tramp-gvfs-handler-askpassword (message user domain flags)
  "Implementation for the \"org.gtk.vfs.MountOperation.askPassword\" method."
  (let* ((filename
          (tramp-gvfs-file-name (dbus-event-path-name last-input-event)))
         (pw-prompt
          (format
           "%s for %s "
           (if (string-match "\\([pP]assword\\|[pP]assphrase\\)" message)
               (capitalize (match-string 1 message))
             "Password")
           filename))
         password)

    (condition-case nil
        (with-parsed-tramp-file-name filename l
          (when (and (zerop (length user))
                     (not
                      (zerop (logand flags tramp-gvfs-password-need-username))))
            (setq user (read-string "User name: ")))
          (when (and (zerop (length domain))
                     (not (zerop (logand flags tramp-gvfs-password-need-domain))))
            (setq domain (read-string "Domain name: ")))

          (tramp-message l 6 "%S %S %S %d" message user domain flags)
          (setq tramp-current-method l-method
                tramp-current-user user
                tramp-current-host l-host
                password (tramp-read-passwd
                          (tramp-get-connection-process l) pw-prompt))

          ;; Return result.
          (if (stringp password)
              (list
               t ;; password handled.
               nil ;; no abort of D-Bus.
               password
               (tramp-file-name-real-user l)
               domain
               nil ;; not anonymous.
               0) ;; no password save.
            ;; No password provided.
            (list nil t "" (tramp-file-name-real-user l) domain nil 0)))

      ;; When QUIT is raised, we shall return this information to D-Bus.
      (quit (list nil t "" "" "" nil 0)))))

(defun tramp-gvfs-handler-askquestion (message choices)
  "Implementation for the \"org.gtk.vfs.MountOperation.askQuestion\" method."
  (save-window-excursion
    (let ((enable-recursive-minibuffers t)
          choice)

      (condition-case nil
          (with-parsed-tramp-file-name
              (tramp-gvfs-file-name (dbus-event-path-name last-input-event)) nil
            (tramp-message v 6 "%S %S" message choices)

            ;; In theory, there can be several choices.  Until now,
            ;; there is only the question whether to accept an unknown
            ;; host signature.
            (with-temp-buffer
              ;; Preserve message for `progress-reporter'.
              (tramp-compat-with-temp-message ""
                (insert message)
                (pop-to-buffer (current-buffer))
                (setq choice (if (yes-or-no-p (concat (car choices) " ")) 0 1))
                (tramp-message v 6 "%d" choice)))

            ;; When the choice is "no", we set a dummy fuse-mountpoint
            ;; in order to leave the timeout.
            (unless (zerop choice)
              (tramp-set-file-property v "/" "fuse-mountpoint" "/"))

            (list
             t ;; handled.
             nil ;; no abort of D-Bus.
             choice))

        ;; When QUIT is raised, we shall return this information to D-Bus.
        (quit (list nil t 0))))))

(defun tramp-gvfs-handler-mounted-unmounted (mount-info)
  "Signal handler for the \"org.gtk.vfs.MountTracker.mounted\" and
\"org.gtk.vfs.MountTracker.unmounted\" signals."
  (ignore-errors
    (let ((signal-name (dbus-event-member-name last-input-event))
          (elt mount-info))
      ;; Jump over the first elements of the mount info. Since there
      ;; were changes in the entries, we cannot access dedicated
      ;; elements.
      (while (stringp (car elt)) (setq elt (cdr elt)))
      (let* ((fuse-mountpoint (tramp-gvfs-dbus-byte-array-to-string (cadr elt)))
             (mount-spec (caddr elt))
             (default-location (tramp-gvfs-dbus-byte-array-to-string
                                (cadddr elt)))
             (method (tramp-gvfs-dbus-byte-array-to-string
                      (cadr (assoc "type" (cadr mount-spec)))))
             (user (tramp-gvfs-dbus-byte-array-to-string
                    (cadr (assoc "user" (cadr mount-spec)))))
             (domain (tramp-gvfs-dbus-byte-array-to-string
                      (cadr (assoc "domain" (cadr mount-spec)))))
             (host (tramp-gvfs-dbus-byte-array-to-string
                    (cadr (or (assoc "host" (cadr mount-spec))
                              (assoc "server" (cadr mount-spec))))))
             (port (tramp-gvfs-dbus-byte-array-to-string
                    (cadr (assoc "port" (cadr mount-spec)))))
             (ssl (tramp-gvfs-dbus-byte-array-to-string
                   (cadr (assoc "ssl" (cadr mount-spec)))))
             (prefix (concat (tramp-gvfs-dbus-byte-array-to-string
                              (car mount-spec))
                             (tramp-gvfs-dbus-byte-array-to-string
                              (cadr (assoc "share" (cadr mount-spec)))))))
        (when (string-match "^smb" method)
          (setq method "smb"))
        (when (string-equal "obex" method)
          (setq host (tramp-bluez-device host)))
        (when (and (string-equal "dav" method) (string-equal "true" ssl))
          (setq method "davs"))
        (unless (zerop (length domain))
          (setq user (concat user tramp-prefix-domain-format domain)))
        (unless (zerop (length port))
          (setq host (concat host tramp-prefix-port-format port)))
        (with-parsed-tramp-file-name
            (tramp-make-tramp-file-name method user host "") nil
          (tramp-message
           v 6 "%s %s"
           signal-name (tramp-gvfs-stringify-dbus-message mount-info))
          (tramp-set-file-property v "/" "list-mounts" 'undef)
          (if (string-equal (downcase signal-name) "unmounted")
              (tramp-set-file-property v "/" "fuse-mountpoint" nil)
            ;; Set prefix, mountpoint and location.
            (unless (string-equal prefix "/")
              (tramp-set-file-property v "/" "prefix" prefix))
            (tramp-set-file-property v "/" "fuse-mountpoint" fuse-mountpoint)
            (tramp-set-file-property
             v "/" "default-location" default-location)))))))

(dbus-register-signal
 :session nil tramp-gvfs-path-mounttracker
 tramp-gvfs-interface-mounttracker "mounted"
 'tramp-gvfs-handler-mounted-unmounted)
(dbus-register-signal
 :session nil tramp-gvfs-path-mounttracker
 tramp-gvfs-interface-mounttracker "Mounted"
 'tramp-gvfs-handler-mounted-unmounted)

(dbus-register-signal
 :session nil tramp-gvfs-path-mounttracker
 tramp-gvfs-interface-mounttracker "unmounted"
 'tramp-gvfs-handler-mounted-unmounted)
(dbus-register-signal
 :session nil tramp-gvfs-path-mounttracker
 tramp-gvfs-interface-mounttracker "Unmounted"
 'tramp-gvfs-handler-mounted-unmounted)

(defun tramp-gvfs-connection-mounted-p (vec)
  "Check, whether the location is already mounted."
  (or
   (tramp-get-file-property vec "/" "fuse-mountpoint" nil)
   (catch 'mounted
     (dolist
         (elt
          (with-tramp-file-property vec "/" "list-mounts"
            (with-tramp-dbus-call-method vec t
              :session tramp-gvfs-service-daemon tramp-gvfs-path-mounttracker
              tramp-gvfs-interface-mounttracker tramp-gvfs-listmounts))
          nil)
       ;; Jump over the first elements of the mount info. Since there
       ;; were changes in the entries, we cannot access dedicated
       ;; elements.
       (while (stringp (car elt)) (setq elt (cdr elt)))
       (let* ((fuse-mountpoint (tramp-gvfs-dbus-byte-array-to-string
                                (cadr elt)))
              (mount-spec (caddr elt))
              (default-location (tramp-gvfs-dbus-byte-array-to-string
                                 (cadddr elt)))
              (method (tramp-gvfs-dbus-byte-array-to-string
                       (cadr (assoc "type" (cadr mount-spec)))))
              (user (tramp-gvfs-dbus-byte-array-to-string
                     (cadr (assoc "user" (cadr mount-spec)))))
              (domain (tramp-gvfs-dbus-byte-array-to-string
                       (cadr (assoc "domain" (cadr mount-spec)))))
              (host (tramp-gvfs-dbus-byte-array-to-string
                     (cadr (or (assoc "host" (cadr mount-spec))
                               (assoc "server" (cadr mount-spec))))))
              (port (tramp-gvfs-dbus-byte-array-to-string
                     (cadr (assoc "port" (cadr mount-spec)))))
              (ssl (tramp-gvfs-dbus-byte-array-to-string
                    (cadr (assoc "ssl" (cadr mount-spec)))))
              (prefix (concat (tramp-gvfs-dbus-byte-array-to-string
                               (car mount-spec))
                              (tramp-gvfs-dbus-byte-array-to-string
                               (cadr (assoc "share" (cadr mount-spec)))))))
         (when (string-match "^smb" method)
           (setq method "smb"))
         (when (string-equal "obex" method)
           (setq host (tramp-bluez-device host)))
         (when (and (string-equal "dav" method) (string-equal "true" ssl))
           (setq method "davs"))
         (when (and (string-equal "synce" method) (zerop (length user)))
           (setq user (or (tramp-file-name-user vec) "")))
         (unless (zerop (length domain))
           (setq user (concat user tramp-prefix-domain-format domain)))
         (unless (zerop (length port))
           (setq host (concat host tramp-prefix-port-format port)))
         (when (and
                (string-equal method (tramp-file-name-method vec))
                (string-equal user (or (tramp-file-name-user vec) ""))
                (string-equal host (tramp-file-name-host vec))
                (string-match (concat "^" (regexp-quote prefix))
                              (tramp-file-name-localname vec)))
           ;; Set prefix, mountpoint and location.
           (unless (string-equal prefix "/")
             (tramp-set-file-property vec "/" "prefix" prefix))
           (tramp-set-file-property vec "/" "fuse-mountpoint" fuse-mountpoint)
           (tramp-set-file-property vec "/" "default-location" default-location)
           (throw 'mounted t)))))))

(defun tramp-gvfs-mount-spec-entry (key value)
  "Construct a mount-spec entry to be used in a mount_spec.
It was \"a(say)\", but has changed to \"a{sv})\"."
  (if (string-match "^(aya{sv})" tramp-gvfs-mountlocation-signature)
      (list :dict-entry key
            (list :variant (tramp-gvfs-dbus-string-to-byte-array value)))
    (list :struct key (tramp-gvfs-dbus-string-to-byte-array value))))

(defun tramp-gvfs-mount-spec (vec)
  "Return a mount-spec for \"org.gtk.vfs.MountTracker.mountLocation\"."
  (let* ((method (tramp-file-name-method vec))
         (user (tramp-file-name-real-user vec))
         (domain (tramp-file-name-domain vec))
         (host (tramp-file-name-real-host vec))
         (port (tramp-file-name-port vec))
         (localname (tramp-file-name-localname vec))
         (ssl (if (string-match "^davs" method) "true" "false"))
         (mount-spec '(:array))
         (mount-pref "/"))

    (setq
     mount-spec
     (append
      mount-spec
      (cond
       ((string-equal "smb" method)
        (string-match "^/?\\([^/]+\\)" localname)
        (list (tramp-gvfs-mount-spec-entry "type" "smb-share")
              (tramp-gvfs-mount-spec-entry "server" host)
              (tramp-gvfs-mount-spec-entry "share" (match-string 1 localname))))
       ((string-equal "obex" method)
        (list (tramp-gvfs-mount-spec-entry "type" method)
              (tramp-gvfs-mount-spec-entry
               "host" (concat "[" (tramp-bluez-address host) "]"))))
       ((string-match "^dav" method)
        (list (tramp-gvfs-mount-spec-entry "type" "dav")
              (tramp-gvfs-mount-spec-entry "host" host)
              (tramp-gvfs-mount-spec-entry "ssl" ssl)))
       (t
        (list (tramp-gvfs-mount-spec-entry "type" method)
              (tramp-gvfs-mount-spec-entry "host" host))))))

    (when user
      (add-to-list
       'mount-spec (tramp-gvfs-mount-spec-entry "user" user) 'append))

    (when domain
      (add-to-list
       'mount-spec (tramp-gvfs-mount-spec-entry "domain" domain) 'append))

    (when port
      (add-to-list
       'mount-spec (tramp-gvfs-mount-spec-entry "port" (number-to-string port))
       'append))

    (when (and (string-match "^dav" method)
               (string-match "^/?[^/]+" localname))
      (setq mount-pref (match-string 0 localname)))

    ;; Return.
    `(:struct ,(tramp-gvfs-dbus-string-to-byte-array mount-pref) ,mount-spec)))

\f
;; Connection functions

(defun tramp-gvfs-maybe-open-connection (vec)
  "Maybe open a connection VEC.
Does not do anything if a connection is already open, but re-opens the
connection if a previous connection has died for some reason."

  ;; We set the file name, in case there are incoming D-Bus signals or
  ;; D-Bus errors.
  (setq tramp-gvfs-dbus-event-vector vec)

  ;; For password handling, we need a process bound to the connection
  ;; buffer.  Therefore, we create a dummy process.  Maybe there is a
  ;; better solution?
  (unless (get-buffer-process (tramp-get-connection-buffer vec))
    (let ((p (make-network-process
              :name (tramp-buffer-name vec)
              :buffer (tramp-get-connection-buffer vec)
              :server t :host 'local :service t)))
      (tramp-compat-set-process-query-on-exit-flag p nil)))

  (unless (tramp-gvfs-connection-mounted-p vec)
    (let* ((method (tramp-file-name-method vec))
           (user (tramp-file-name-user vec))
           (host (tramp-file-name-host vec))
           (localname (tramp-file-name-localname vec))
           (object-path
            (tramp-gvfs-object-path
             (tramp-make-tramp-file-name method user host ""))))

      (when (and (string-equal method "smb")
                 (string-equal localname "/"))
        (tramp-error vec 'file-error "Filename must contain a Windows share"))

      (with-tramp-progress-reporter
          vec 3
          (if (zerop (length user))
              (format "Opening connection for %s using %s" host method)
            (format "Opening connection for %s@%s using %s" user host method))

        ;; Enable auth-source and password-cache.
        (tramp-set-connection-property vec "first-password-request" t)

        ;; There will be a callback of "askPassword" when a password is
        ;; needed.
        (dbus-register-method
         :session dbus-service-emacs object-path
         tramp-gvfs-interface-mountoperation "askPassword"
         'tramp-gvfs-handler-askpassword)
        (dbus-register-method
         :session dbus-service-emacs object-path
         tramp-gvfs-interface-mountoperation "AskPassword"
         'tramp-gvfs-handler-askpassword)

        ;; There could be a callback of "askQuestion" when adding fingerprint.
        (dbus-register-method
         :session dbus-service-emacs object-path
         tramp-gvfs-interface-mountoperation "askQuestion"
         'tramp-gvfs-handler-askquestion)
        (dbus-register-method
         :session dbus-service-emacs object-path
         tramp-gvfs-interface-mountoperation "AskQuestion"
         'tramp-gvfs-handler-askquestion)

        ;; The call must be asynchronously, because of the "askPassword"
        ;; or "askQuestion"callbacks.
        (if (string-match "(so)$" tramp-gvfs-mountlocation-signature)
            (with-tramp-dbus-call-method vec nil
              :session tramp-gvfs-service-daemon tramp-gvfs-path-mounttracker
              tramp-gvfs-interface-mounttracker tramp-gvfs-mountlocation
              (tramp-gvfs-mount-spec vec)
              `(:struct :string ,(dbus-get-unique-name :session)
                        :object-path ,object-path))
          (with-tramp-dbus-call-method vec nil
            :session tramp-gvfs-service-daemon tramp-gvfs-path-mounttracker
            tramp-gvfs-interface-mounttracker tramp-gvfs-mountlocation
            (tramp-gvfs-mount-spec vec)
            :string (dbus-get-unique-name :session) :object-path object-path))

        ;; We must wait, until the mount is applied.  This will be
        ;; indicated by the "mounted" signal, i.e. the "fuse-mountpoint"
        ;; file property.
        (with-timeout
            (60
             (if (zerop (length (tramp-file-name-user vec)))
                 (tramp-error
                  vec 'file-error
                  "Timeout reached mounting %s using %s" host method)
               (tramp-error
                vec 'file-error
                "Timeout reached mounting %s@%s using %s" user host method)))
          (while (not (tramp-get-file-property vec "/" "fuse-mountpoint" nil))
            (read-event nil nil 0.1)))

        ;; If `tramp-gvfs-handler-askquestion' has returned "No", it
        ;; is marked with the fuse-mountpoint "/".  We shall react.
        (when (string-equal
               (tramp-get-file-property vec "/" "fuse-mountpoint" "") "/")
          (tramp-error vec 'file-error "FUSE mount denied"))

        ;; In `tramp-check-cached-permissions', the connection
        ;; properties {uig,gid}-{integer,string} are used.  We set
        ;; them to their local counterparts.
        (tramp-set-connection-property
         vec "uid-integer" (tramp-get-local-uid 'integer))
        (tramp-set-connection-property
         vec "gid-integer" (tramp-get-local-gid 'integer))
        (tramp-set-connection-property
         vec "uid-string" (tramp-get-local-uid 'string))
        (tramp-set-connection-property
         vec "gid-string" (tramp-get-local-gid 'string))))))

(defun tramp-gvfs-send-command (vec command &rest args)
  "Send the COMMAND with its ARGS to connection VEC.
COMMAND is usually a command from the gvfs-* utilities.
`call-process' is applied, and it returns `t' if the return code is zero."
  (let (result)
    (with-current-buffer (tramp-get-connection-buffer vec)
      (tramp-gvfs-maybe-open-connection vec)
      (erase-buffer)
      (tramp-message vec 6 "%s %s" command (mapconcat 'identity args " "))
      (setq result (apply 'tramp-call-process command nil t nil args))
      (tramp-message vec 6 "\n%s" (buffer-string))
      (zerop result))))

\f
;; D-Bus BLUEZ functions.

(defun tramp-bluez-list-devices ()
  "Return all discovered bluetooth devices as list.
Every entry is a list (NAME ADDRESS).

If `tramp-bluez-discover-devices-timeout' is an integer, and the last
discovery happened more time before indicated there, a rescan will be
started, which lasts some ten seconds.  Otherwise, cached results will
be used."
  ;; Reset the scanned devices list if time has passed.
  (and (integerp tramp-bluez-discover-devices-timeout)
       (integerp tramp-bluez-discovery)
       (> (tramp-time-diff (current-time) tramp-bluez-discovery)
          tramp-bluez-discover-devices-timeout)
       (setq tramp-bluez-devices nil))

  ;; Rescan if needed.
  (unless tramp-bluez-devices
    (let ((object-path
           (with-tramp-dbus-call-method tramp-gvfs-dbus-event-vector t
             :system tramp-bluez-service "/"
             tramp-bluez-interface-manager "DefaultAdapter")))
      (setq tramp-bluez-devices nil
            tramp-bluez-discovery t)
      (with-tramp-dbus-call-method tramp-gvfs-dbus-event-vector nil
        :system tramp-bluez-service object-path
        tramp-bluez-interface-adapter "StartDiscovery")
      (while tramp-bluez-discovery
        (read-event nil nil 0.1))))
  (setq tramp-bluez-discovery (current-time))
  (tramp-message tramp-gvfs-dbus-event-vector 10 "%s" tramp-bluez-devices)
  tramp-bluez-devices)

(defun tramp-bluez-property-changed (property value)
  "Signal handler for the \"org.bluez.Adapter.PropertyChanged\" signal."
  (tramp-message tramp-gvfs-dbus-event-vector 6 "%s %s" property value)
  (cond
   ((string-equal property "Discovering")
    (unless (car value)
      ;; "Discovering" FALSE means discovery run has been completed.
      ;; We stop it, because we don't need another run.
      (setq tramp-bluez-discovery nil)
      (with-tramp-dbus-call-method tramp-gvfs-dbus-event-vector t
        :system tramp-bluez-service (dbus-event-path-name last-input-event)
        tramp-bluez-interface-adapter "StopDiscovery")))))

(dbus-register-signal
 :system nil nil tramp-bluez-interface-adapter "PropertyChanged"
 'tramp-bluez-property-changed)

(defun tramp-bluez-device-found (device args)
  "Signal handler for the \"org.bluez.Adapter.DeviceFound\" signal."
  (tramp-message tramp-gvfs-dbus-event-vector 6 "%s %s" device args)
  (let ((alias (car (cadr (assoc "Alias" args))))
        (address (car (cadr (assoc "Address" args)))))
    ;; Maybe we shall check the device class for being a proper
    ;; device, and call also SDP in order to find the obex service.
    (add-to-list 'tramp-bluez-devices (list alias address))))

(dbus-register-signal
 :system nil nil tramp-bluez-interface-adapter "DeviceFound"
 'tramp-bluez-device-found)

(defun tramp-bluez-parse-device-names (ignore)
  "Return a list of (nil host) tuples allowed to access."
  (mapcar
   (lambda (x) (list nil (car x)))
   (tramp-bluez-list-devices)))

;; Add completion function for OBEX method.
(when (member tramp-bluez-service (dbus-list-known-names :system))
  (tramp-set-completion-function
   "obex" '((tramp-bluez-parse-device-names ""))))

\f
;; D-Bus zeroconf functions.

(defun tramp-zeroconf-parse-workstation-device-names (ignore)
  "Return a list of (user host) tuples allowed to access."
  (mapcar
   (lambda (x)
     (list nil (zeroconf-service-host x)))
   (zeroconf-list-services "_workstation._tcp")))

(defun tramp-zeroconf-parse-webdav-device-names (ignore)
  "Return a list of (user host) tuples allowed to access."
  (mapcar
   (lambda (x)
     (let ((host (zeroconf-service-host x))
           (port (zeroconf-service-port x))
           (text (zeroconf-service-txt x))
           user)
       (when port
         (setq host (format "%s%s%d" host tramp-prefix-port-regexp port)))
       ;; A user is marked in a TXT field like "u=guest".
       (while text
         (when (string-match "u=\\(.+\\)$" (car text))
           (setq user (match-string 1 (car text))))
         (setq text (cdr text)))
       (list user host)))
   (zeroconf-list-services "_webdav._tcp")))

;; Add completion function for DAV and DAVS methods.
(when (member zeroconf-service-avahi (dbus-list-known-names :system))
  (zeroconf-init tramp-gvfs-zeroconf-domain)
  (tramp-set-completion-function
   "sftp" '((tramp-zeroconf-parse-workstation-device-names "")))
  (tramp-set-completion-function
   "dav" '((tramp-zeroconf-parse-webdav-device-names "")))
  (tramp-set-completion-function
   "davs" '((tramp-zeroconf-parse-webdav-device-names ""))))

\f
;; D-Bus SYNCE functions.

(defun tramp-synce-list-devices ()
  "Return all discovered synce devices as list.
They are retrieved from the hal daemon."
  (let (tramp-synce-devices)
    (dolist (device
             (with-tramp-dbus-call-method tramp-gvfs-dbus-event-vector t
               :system tramp-hal-service tramp-hal-path-manager
               tramp-hal-interface-manager "GetAllDevices"))
      (when (with-tramp-dbus-call-method tramp-gvfs-dbus-event-vector t
              :system tramp-hal-service device tramp-hal-interface-device
              "PropertyExists" "sync.plugin")
        (add-to-list
         'tramp-synce-devices
         (with-tramp-dbus-call-method tramp-gvfs-dbus-event-vector t
           :system tramp-hal-service device tramp-hal-interface-device
           "GetPropertyString" "pda.pocketpc.name"))))
    (tramp-message tramp-gvfs-dbus-event-vector 10 "%s" tramp-synce-devices)
    tramp-synce-devices))

(defun tramp-synce-parse-device-names (ignore)
  "Return a list of (nil host) tuples allowed to access."
  (mapcar
   (lambda (x) (list nil x))
   (tramp-synce-list-devices)))

;; Add completion function for SYNCE method.
(tramp-set-completion-function
 "synce" '((tramp-synce-parse-device-names "")))

(add-hook 'tramp-unload-hook
          (lambda ()
            (unload-feature 'tramp-gvfs 'force)))

(provide 'tramp-gvfs)

;;; TODO:

;; * Host name completion via smb-server or smb-network.
;; * Check how two shares of the same SMB server can be mounted in
;;   parallel.
;; * Apply SDP on bluetooth devices, in order to filter out obex
;;   capability.
;; * Implement obex for other serial communication but bluetooth.

;;; tramp-gvfs.el ends here