mount-operation: add show-unmount-progress signal
[platform/upstream/glib.git] / gio / gmountoperation.c
1 /* GIO - GLib Input, Output and Streaming Library
2  * 
3  * Copyright (C) 2006-2007 Red Hat, Inc.
4  *
5  * This library is free software; you can redistribute it and/or
6  * modify it under the terms of the GNU Lesser General Public
7  * License as published by the Free Software Foundation; either
8  * version 2 of the License, or (at your option) any later version.
9  *
10  * This library is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13  * Lesser General Public License for more details.
14  *
15  * You should have received a copy of the GNU Lesser General
16  * Public License along with this library; if not, write to the
17  * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
18  * Boston, MA 02111-1307, USA.
19  *
20  * Author: Alexander Larsson <alexl@redhat.com>
21  */
22
23 #include "config.h"
24
25 #include <string.h>
26
27 #include "gmountoperation.h"
28 #include "gioenumtypes.h"
29 #include "glibintl.h"
30
31
32 /**
33  * SECTION:gmountoperation
34  * @short_description: Object used for authentication and user interaction
35  * @include: gio/gio.h
36  *
37  * #GMountOperation provides a mechanism for interacting with the user.
38  * It can be used for authenticating mountable operations, such as loop
39  * mounting files, hard drive partitions or server locations. It can
40  * also be used to ask the user questions or show a list of applications
41  * preventing unmount or eject operations from completing.
42  *
43  * Note that #GMountOperation is used for more than just #GMount
44  * objects – for example it is also used in g_drive_start() and
45  * g_drive_stop().
46  *
47  * Users should instantiate a subclass of this that implements all the
48  * various callbacks to show the required dialogs, such as
49  * #GtkMountOperation. If no user interaction is desired (for example
50  * when automounting filesystems at login time), usually %NULL can be
51  * passed, see each method taking a #GMountOperation for details.
52  */
53
54 G_DEFINE_TYPE (GMountOperation, g_mount_operation, G_TYPE_OBJECT);
55
56 enum {
57   ASK_PASSWORD,
58   ASK_QUESTION,
59   REPLY,
60   ABORTED,
61   SHOW_PROCESSES,
62   SHOW_UNMOUNT_PROGRESS,
63   LAST_SIGNAL
64 };
65
66 static guint signals[LAST_SIGNAL] = { 0 };
67
68 struct _GMountOperationPrivate {
69   char *password;
70   char *user;
71   char *domain;
72   gboolean anonymous;
73   GPasswordSave password_save;
74   int choice;
75 };
76
77 enum {
78   PROP_0,
79   PROP_USERNAME,
80   PROP_PASSWORD,
81   PROP_ANONYMOUS,
82   PROP_DOMAIN,
83   PROP_PASSWORD_SAVE,
84   PROP_CHOICE
85 };
86
87 static void 
88 g_mount_operation_set_property (GObject      *object,
89                                 guint         prop_id,
90                                 const GValue *value,
91                                 GParamSpec   *pspec)
92 {
93   GMountOperation *operation;
94
95   operation = G_MOUNT_OPERATION (object);
96
97   switch (prop_id)
98     {
99     case PROP_USERNAME:
100       g_mount_operation_set_username (operation, 
101                                       g_value_get_string (value));
102       break;
103    
104     case PROP_PASSWORD:
105       g_mount_operation_set_password (operation, 
106                                       g_value_get_string (value));
107       break;
108
109     case PROP_ANONYMOUS:
110       g_mount_operation_set_anonymous (operation, 
111                                        g_value_get_boolean (value));
112       break;
113
114     case PROP_DOMAIN:
115       g_mount_operation_set_domain (operation, 
116                                     g_value_get_string (value));
117       break;
118
119     case PROP_PASSWORD_SAVE:
120       g_mount_operation_set_password_save (operation, 
121                                            g_value_get_enum (value));
122       break;
123
124     case PROP_CHOICE:
125       g_mount_operation_set_choice (operation, 
126                                     g_value_get_int (value));
127       break;
128
129     default:
130       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
131       break;
132     }
133 }
134
135
136 static void 
137 g_mount_operation_get_property (GObject    *object,
138                                 guint       prop_id,
139                                 GValue     *value,
140                                 GParamSpec *pspec)
141 {
142   GMountOperation *operation;
143   GMountOperationPrivate *priv;
144
145   operation = G_MOUNT_OPERATION (object);
146   priv = operation->priv;
147   
148   switch (prop_id)
149     {
150     case PROP_USERNAME:
151       g_value_set_string (value, priv->user);
152       break;
153
154     case PROP_PASSWORD:
155       g_value_set_string (value, priv->password);
156       break;
157
158     case PROP_ANONYMOUS:
159       g_value_set_boolean (value, priv->anonymous);
160       break;
161
162     case PROP_DOMAIN:
163       g_value_set_string (value, priv->domain);
164       break;
165
166     case PROP_PASSWORD_SAVE:
167       g_value_set_enum (value, priv->password_save);
168       break;
169
170     case PROP_CHOICE:
171       g_value_set_int (value, priv->choice);
172       break;
173
174     default:
175       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
176       break;
177     }
178 }
179
180
181 static void
182 g_mount_operation_finalize (GObject *object)
183 {
184   GMountOperation *operation;
185   GMountOperationPrivate *priv;
186
187   operation = G_MOUNT_OPERATION (object);
188
189   priv = operation->priv;
190   
191   g_free (priv->password);
192   g_free (priv->user);
193   g_free (priv->domain);
194
195   G_OBJECT_CLASS (g_mount_operation_parent_class)->finalize (object);
196 }
197
198 static gboolean
199 reply_non_handled_in_idle (gpointer data)
200 {
201   GMountOperation *op = data;
202
203   g_mount_operation_reply (op, G_MOUNT_OPERATION_UNHANDLED);
204   return G_SOURCE_REMOVE;
205 }
206
207 static void
208 ask_password (GMountOperation *op,
209               const char      *message,
210               const char      *default_user,
211               const char      *default_domain,
212               GAskPasswordFlags flags)
213 {
214   g_idle_add_full (G_PRIORITY_DEFAULT_IDLE,
215                    reply_non_handled_in_idle,
216                    g_object_ref (op),
217                    g_object_unref);
218 }
219   
220 static void
221 ask_question (GMountOperation *op,
222               const char      *message,
223               const char      *choices[])
224 {
225   g_idle_add_full (G_PRIORITY_DEFAULT_IDLE,
226                    reply_non_handled_in_idle,
227                    g_object_ref (op),
228                    g_object_unref);
229 }
230
231 static void
232 show_processes (GMountOperation      *op,
233                 const gchar          *message,
234                 GArray               *processes,
235                 const gchar          *choices[])
236 {
237   g_idle_add_full (G_PRIORITY_DEFAULT_IDLE,
238                    reply_non_handled_in_idle,
239                    g_object_ref (op),
240                    g_object_unref);
241 }
242
243 static void
244 show_unmount_progress (GMountOperation *op,
245                        const gchar     *message,
246                        guint64          time_left,
247                        guint64          bytes_left)
248 {
249   /* nothing to do */
250 }
251
252 static void
253 g_mount_operation_class_init (GMountOperationClass *klass)
254 {
255   GObjectClass *object_class;
256   
257   g_type_class_add_private (klass, sizeof (GMountOperationPrivate));
258  
259   object_class = G_OBJECT_CLASS (klass);
260   object_class->finalize = g_mount_operation_finalize;
261   object_class->get_property = g_mount_operation_get_property;
262   object_class->set_property = g_mount_operation_set_property;
263   
264   klass->ask_password = ask_password;
265   klass->ask_question = ask_question;
266   klass->show_processes = show_processes;
267   klass->show_unmount_progress = show_unmount_progress;
268   
269   /**
270    * GMountOperation::ask-password:
271    * @op: a #GMountOperation requesting a password.
272    * @message: string containing a message to display to the user.
273    * @default_user: string containing the default user name.
274    * @default_domain: string containing the default domain.
275    * @flags: a set of #GAskPasswordFlags.
276    *
277    * Emitted when a mount operation asks the user for a password.
278    *
279    * If the message contains a line break, the first line should be
280    * presented as a heading. For example, it may be used as the
281    * primary text in a #GtkMessageDialog.
282    */
283   signals[ASK_PASSWORD] =
284     g_signal_new (I_("ask-password"),
285                   G_TYPE_FROM_CLASS (object_class),
286                   G_SIGNAL_RUN_LAST,
287                   G_STRUCT_OFFSET (GMountOperationClass, ask_password),
288                   NULL, NULL,
289                   NULL,
290                   G_TYPE_NONE, 4,
291                   G_TYPE_STRING, G_TYPE_STRING, G_TYPE_STRING, G_TYPE_ASK_PASSWORD_FLAGS);
292                   
293   /**
294    * GMountOperation::ask-question:
295    * @op: a #GMountOperation asking a question.
296    * @message: string containing a message to display to the user.
297    * @choices: an array of strings for each possible choice.
298    *
299    * Emitted when asking the user a question and gives a list of
300    * choices for the user to choose from.
301    *
302    * If the message contains a line break, the first line should be
303    * presented as a heading. For example, it may be used as the
304    * primary text in a #GtkMessageDialog.
305    */
306   signals[ASK_QUESTION] =
307     g_signal_new (I_("ask-question"),
308                   G_TYPE_FROM_CLASS (object_class),
309                   G_SIGNAL_RUN_LAST,
310                   G_STRUCT_OFFSET (GMountOperationClass, ask_question),
311                   NULL, NULL,
312                   NULL,
313                   G_TYPE_NONE, 2,
314                   G_TYPE_STRING, G_TYPE_STRV);
315                   
316   /**
317    * GMountOperation::reply:
318    * @op: a #GMountOperation.
319    * @result: a #GMountOperationResult indicating how the request was handled
320    *
321    * Emitted when the user has replied to the mount operation.
322    */
323   signals[REPLY] =
324     g_signal_new (I_("reply"),
325                   G_TYPE_FROM_CLASS (object_class),
326                   G_SIGNAL_RUN_LAST,
327                   G_STRUCT_OFFSET (GMountOperationClass, reply),
328                   NULL, NULL,
329                   g_cclosure_marshal_VOID__ENUM,
330                   G_TYPE_NONE, 1,
331                   G_TYPE_MOUNT_OPERATION_RESULT);
332
333   /**
334    * GMountOperation::aborted:
335    *
336    * Emitted by the backend when e.g. a device becomes unavailable
337    * while a mount operation is in progress.
338    *
339    * Implementations of GMountOperation should handle this signal
340    * by dismissing open password dialogs.
341    *
342    * Since: 2.20
343    */
344   signals[ABORTED] =
345     g_signal_new (I_("aborted"),
346                   G_TYPE_FROM_CLASS (object_class),
347                   G_SIGNAL_RUN_LAST,
348                   G_STRUCT_OFFSET (GMountOperationClass, aborted),
349                   NULL, NULL,
350                   g_cclosure_marshal_VOID__VOID,
351                   G_TYPE_NONE, 0);
352
353   /**
354    * GMountOperation::show-processes:
355    * @op: a #GMountOperation.
356    * @message: string containing a message to display to the user.
357    * @processes: (element-type GPid): an array of #GPid for processes
358    *   blocking the operation.
359    * @choices: an array of strings for each possible choice.
360    *
361    * Emitted when one or more processes are blocking an operation
362    * e.g. unmounting/ejecting a #GMount or stopping a #GDrive.
363    *
364    * Note that this signal may be emitted several times to update the
365    * list of blocking processes as processes close files. The
366    * application should only respond with g_mount_operation_reply() to
367    * the latest signal (setting #GMountOperation:choice to the choice
368    * the user made).
369    *
370    * If the message contains a line break, the first line should be
371    * presented as a heading. For example, it may be used as the
372    * primary text in a #GtkMessageDialog.
373    *
374    * Since: 2.22
375    */
376   signals[SHOW_PROCESSES] =
377     g_signal_new (I_("show-processes"),
378                   G_TYPE_FROM_CLASS (object_class),
379                   G_SIGNAL_RUN_LAST,
380                   G_STRUCT_OFFSET (GMountOperationClass, show_processes),
381                   NULL, NULL,
382                   NULL,
383                   G_TYPE_NONE, 3,
384                   G_TYPE_STRING, G_TYPE_ARRAY, G_TYPE_STRV);
385
386   /**
387    * GMountOperation::show-unmount-progress:
388    * @op: a #GMountOperation:
389    * @message: string containing a mesage to display to the user
390    * @time_left: the estimated time left before the operation completes, or -1
391    * @bytes_left: the amount of bytes to be written before the operation
392    *     completes (or -1 if such amount is not known), or zero if the operation
393    *     is completed
394    *
395    * Emitted when an unmount operation has been busy for more than some time
396    * (typically 1.5 seconds).
397    *
398    * When unmounting or ejecting a volume, the kernel might need to flush
399    * pending data in its buffers to the volume stable storage, and this operation
400    * can take a considerable amount of time. This signal may be emitted several
401    * times as long as the unmount operation is outstanding, and then one
402    * last time when the operation is completed, with @bytes_left set to zero.
403    *
404    * Implementations of GMountOperation should handle this signal by
405    * showing an UI notification, and then dismiss it, or show another notification
406    * of completion, when @bytes_left reaches zero.
407    *
408    * If the message contains a line break, the first line should be
409    * presented as a heading. For example, it may be used as the
410    * primary text in a #GtkMessageDialog.
411    */
412   signals[SHOW_UNMOUNT_PROGRESS] =
413     g_signal_new (I_("show-unmount-progress"),
414                   G_TYPE_FROM_CLASS (object_class),
415                   G_SIGNAL_RUN_LAST,
416                   G_STRUCT_OFFSET (GMountOperationClass, show_unmount_progress),
417                   NULL, NULL, NULL,
418                   G_TYPE_NONE, 3,
419                   G_TYPE_STRING, G_TYPE_UINT64, G_TYPE_UINT64);
420
421   /**
422    * GMountOperation:username:
423    *
424    * The user name that is used for authentication when carrying out
425    * the mount operation.
426    */ 
427   g_object_class_install_property (object_class,
428                                    PROP_USERNAME,
429                                    g_param_spec_string ("username",
430                                                         P_("Username"),
431                                                         P_("The user name"),
432                                                         NULL,
433                                                         G_PARAM_READWRITE|
434                                                         G_PARAM_STATIC_NAME|G_PARAM_STATIC_NICK|G_PARAM_STATIC_BLURB));
435
436   /**
437    * GMountOperation:password:
438    *
439    * The password that is used for authentication when carrying out
440    * the mount operation.
441    */ 
442   g_object_class_install_property (object_class,
443                                    PROP_PASSWORD,
444                                    g_param_spec_string ("password",
445                                                         P_("Password"),
446                                                         P_("The password"),
447                                                         NULL,
448                                                         G_PARAM_READWRITE|
449                                                         G_PARAM_STATIC_NAME|G_PARAM_STATIC_NICK|G_PARAM_STATIC_BLURB));
450
451   /**
452    * GMountOperation:anonymous:
453    * 
454    * Whether to use an anonymous user when authenticating.
455    */
456   g_object_class_install_property (object_class,
457                                    PROP_ANONYMOUS,
458                                    g_param_spec_boolean ("anonymous",
459                                                          P_("Anonymous"),
460                                                          P_("Whether to use an anonymous user"),
461                                                          FALSE,
462                                                          G_PARAM_READWRITE|
463                                                          G_PARAM_STATIC_NAME|G_PARAM_STATIC_NICK|G_PARAM_STATIC_BLURB));
464
465   /**
466    * GMountOperation:domain:
467    *
468    * The domain to use for the mount operation.
469    */ 
470   g_object_class_install_property (object_class,
471                                    PROP_DOMAIN,
472                                    g_param_spec_string ("domain",
473                                                         P_("Domain"),
474                                                         P_("The domain of the mount operation"),
475                                                         NULL,
476                                                         G_PARAM_READWRITE|
477                                                         G_PARAM_STATIC_NAME|G_PARAM_STATIC_NICK|G_PARAM_STATIC_BLURB));
478
479   /**
480    * GMountOperation:password-save:
481    *
482    * Determines if and how the password information should be saved. 
483    */ 
484   g_object_class_install_property (object_class,
485                                    PROP_PASSWORD_SAVE,
486                                    g_param_spec_enum ("password-save",
487                                                       P_("Password save"),
488                                                       P_("How passwords should be saved"),
489                                                       G_TYPE_PASSWORD_SAVE,
490                                                       G_PASSWORD_SAVE_NEVER,
491                                                       G_PARAM_READWRITE|
492                                                       G_PARAM_STATIC_NAME|G_PARAM_STATIC_NICK|G_PARAM_STATIC_BLURB));
493
494   /**
495    * GMountOperation:choice:
496    *
497    * The index of the user's choice when a question is asked during the 
498    * mount operation. See the #GMountOperation::ask-question signal.
499    */ 
500   g_object_class_install_property (object_class,
501                                    PROP_CHOICE,
502                                    g_param_spec_int ("choice",
503                                                      P_("Choice"),
504                                                      P_("The users choice"),
505                                                      0, G_MAXINT, 0,
506                                                      G_PARAM_READWRITE|
507                                                      G_PARAM_STATIC_NAME|G_PARAM_STATIC_NICK|G_PARAM_STATIC_BLURB));
508 }
509
510 static void
511 g_mount_operation_init (GMountOperation *operation)
512 {
513   operation->priv = G_TYPE_INSTANCE_GET_PRIVATE (operation,
514                                                  G_TYPE_MOUNT_OPERATION,
515                                                  GMountOperationPrivate);
516 }
517
518 /**
519  * g_mount_operation_new:
520  * 
521  * Creates a new mount operation.
522  * 
523  * Returns: a #GMountOperation.
524  **/
525 GMountOperation *
526 g_mount_operation_new (void)
527 {
528   return g_object_new (G_TYPE_MOUNT_OPERATION, NULL);
529 }
530
531 /**
532  * g_mount_operation_get_username:
533  * @op: a #GMountOperation.
534  * 
535  * Get the user name from the mount operation.
536  *
537  * Returns: a string containing the user name.
538  **/
539 const char *
540 g_mount_operation_get_username (GMountOperation *op)
541 {
542   g_return_val_if_fail (G_IS_MOUNT_OPERATION (op), NULL);
543   return op->priv->user;
544 }
545
546 /**
547  * g_mount_operation_set_username:
548  * @op: a #GMountOperation.
549  * @username: input username.
550  *
551  * Sets the user name within @op to @username.
552  **/
553 void
554 g_mount_operation_set_username (GMountOperation *op,
555                                 const char      *username)
556 {
557   g_return_if_fail (G_IS_MOUNT_OPERATION (op));
558   g_free (op->priv->user);
559   op->priv->user = g_strdup (username);
560   g_object_notify (G_OBJECT (op), "username");
561 }
562
563 /**
564  * g_mount_operation_get_password:
565  * @op: a #GMountOperation.
566  *
567  * Gets a password from the mount operation. 
568  *
569  * Returns: a string containing the password within @op.
570  **/
571 const char *
572 g_mount_operation_get_password (GMountOperation *op)
573 {
574   g_return_val_if_fail (G_IS_MOUNT_OPERATION (op), NULL);
575   return op->priv->password;
576 }
577
578 /**
579  * g_mount_operation_set_password:
580  * @op: a #GMountOperation.
581  * @password: password to set.
582  * 
583  * Sets the mount operation's password to @password.  
584  *
585  **/
586 void
587 g_mount_operation_set_password (GMountOperation *op,
588                                 const char      *password)
589 {
590   g_return_if_fail (G_IS_MOUNT_OPERATION (op));
591   g_free (op->priv->password);
592   op->priv->password = g_strdup (password);
593   g_object_notify (G_OBJECT (op), "password");
594 }
595
596 /**
597  * g_mount_operation_get_anonymous:
598  * @op: a #GMountOperation.
599  * 
600  * Check to see whether the mount operation is being used 
601  * for an anonymous user.
602  * 
603  * Returns: %TRUE if mount operation is anonymous. 
604  **/
605 gboolean
606 g_mount_operation_get_anonymous (GMountOperation *op)
607 {
608   g_return_val_if_fail (G_IS_MOUNT_OPERATION (op), FALSE);
609   return op->priv->anonymous;
610 }
611
612 /**
613  * g_mount_operation_set_anonymous:
614  * @op: a #GMountOperation.
615  * @anonymous: boolean value.
616  * 
617  * Sets the mount operation to use an anonymous user if @anonymous is %TRUE.
618  **/  
619 void
620 g_mount_operation_set_anonymous (GMountOperation *op,
621                                  gboolean         anonymous)
622 {
623   GMountOperationPrivate *priv;
624   g_return_if_fail (G_IS_MOUNT_OPERATION (op));
625   priv = op->priv;
626
627   if (priv->anonymous != anonymous)
628     {
629       priv->anonymous = anonymous;
630       g_object_notify (G_OBJECT (op), "anonymous");
631     }
632 }
633
634 /**
635  * g_mount_operation_get_domain:
636  * @op: a #GMountOperation.
637  * 
638  * Gets the domain of the mount operation.
639  * 
640  * Returns: a string set to the domain. 
641  **/
642 const char *
643 g_mount_operation_get_domain (GMountOperation *op)
644 {
645   g_return_val_if_fail (G_IS_MOUNT_OPERATION (op), NULL);
646   return op->priv->domain;
647 }
648
649 /**
650  * g_mount_operation_set_domain:
651  * @op: a #GMountOperation.
652  * @domain: the domain to set.
653  * 
654  * Sets the mount operation's domain. 
655  **/  
656 void
657 g_mount_operation_set_domain (GMountOperation *op,
658                               const char      *domain)
659 {
660   g_return_if_fail (G_IS_MOUNT_OPERATION (op));
661   g_free (op->priv->domain);
662   op->priv->domain = g_strdup (domain);
663   g_object_notify (G_OBJECT (op), "domain");
664 }
665
666 /**
667  * g_mount_operation_get_password_save:
668  * @op: a #GMountOperation.
669  * 
670  * Gets the state of saving passwords for the mount operation.
671  *
672  * Returns: a #GPasswordSave flag. 
673  **/  
674
675 GPasswordSave
676 g_mount_operation_get_password_save (GMountOperation *op)
677 {
678   g_return_val_if_fail (G_IS_MOUNT_OPERATION (op), G_PASSWORD_SAVE_NEVER);
679   return op->priv->password_save;
680 }
681
682 /**
683  * g_mount_operation_set_password_save:
684  * @op: a #GMountOperation.
685  * @save: a set of #GPasswordSave flags.
686  * 
687  * Sets the state of saving passwords for the mount operation.
688  * 
689  **/   
690 void
691 g_mount_operation_set_password_save (GMountOperation *op,
692                                      GPasswordSave    save)
693 {
694   GMountOperationPrivate *priv;
695   g_return_if_fail (G_IS_MOUNT_OPERATION (op));
696   priv = op->priv;
697  
698   if (priv->password_save != save)
699     {
700       priv->password_save = save;
701       g_object_notify (G_OBJECT (op), "password-save");
702     }
703 }
704
705 /**
706  * g_mount_operation_get_choice:
707  * @op: a #GMountOperation.
708  * 
709  * Gets a choice from the mount operation.
710  *
711  * Returns: an integer containing an index of the user's choice from 
712  * the choice's list, or %0.
713  **/
714 int
715 g_mount_operation_get_choice (GMountOperation *op)
716 {
717   g_return_val_if_fail (G_IS_MOUNT_OPERATION (op), 0);
718   return op->priv->choice;
719 }
720
721 /**
722  * g_mount_operation_set_choice:
723  * @op: a #GMountOperation.
724  * @choice: an integer.
725  *
726  * Sets a default choice for the mount operation.
727  **/
728 void
729 g_mount_operation_set_choice (GMountOperation *op,
730                               int              choice)
731 {
732   GMountOperationPrivate *priv;
733   g_return_if_fail (G_IS_MOUNT_OPERATION (op));
734   priv = op->priv;
735   if (priv->choice != choice)
736     {
737       priv->choice = choice;
738       g_object_notify (G_OBJECT (op), "choice");
739     }
740 }
741
742 /**
743  * g_mount_operation_reply:
744  * @op: a #GMountOperation
745  * @result: a #GMountOperationResult
746  * 
747  * Emits the #GMountOperation::reply signal.
748  **/
749 void
750 g_mount_operation_reply (GMountOperation *op,
751                          GMountOperationResult result)
752 {
753   g_return_if_fail (G_IS_MOUNT_OPERATION (op));
754   g_signal_emit (op, signals[REPLY], 0, result);
755 }