/* GIO - GLib Input, Output and Streaming Library
*
* Copyright (C) 2006-2007 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General
* Public License along with this library; if not, see .
*
* Author: Alexander Larsson
* David Zeuthen
*/
#include "config.h"
#include "gdrive.h"
#include "gtask.h"
#include "gthemedicon.h"
#include "gasyncresult.h"
#include "gioerror.h"
#include "glibintl.h"
/**
* SECTION:gdrive
* @short_description: Drive management
* @include: gio/gio.h
*
* #GDrive - this represent a piece of hardware connected to the machine.
* It's generally only created for removable hardware or hardware with
* removable media.
*
* #GDrive is a container class for #GVolume objects that stem from
* the same piece of media. As such, #GDrive abstracts a drive with
* (or without) removable media and provides operations for querying
* whether media is available, determining whether media change is
* automatically detected and ejecting the media.
*
* If the #GDrive reports that media isn't automatically detected, one
* can poll for media; typically one should not do this periodically
* as a poll for media operation is potententially expensive and may
* spin up the drive creating noise.
*
* #GDrive supports starting and stopping drives with authentication
* support for the former. This can be used to support a diverse set
* of use cases including connecting/disconnecting iSCSI devices,
* powering down external disk enclosures and starting/stopping
* multi-disk devices such as RAID devices. Note that the actual
* semantics and side-effects of starting/stopping a #GDrive may vary
* according to implementation. To choose the correct verbs in e.g. a
* file manager, use g_drive_get_start_stop_type().
*
* For porting from GnomeVFS note that there is no equivalent of
* #GDrive in that API.
**/
typedef GDriveIface GDriveInterface;
G_DEFINE_INTERFACE(GDrive, g_drive, G_TYPE_OBJECT)
static void
g_drive_default_init (GDriveInterface *iface)
{
/**
* GDrive::changed:
* @drive: a #GDrive.
*
* Emitted when the drive's state has changed.
**/
g_signal_new (I_("changed"),
G_TYPE_DRIVE,
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GDriveIface, changed),
NULL, NULL,
g_cclosure_marshal_VOID__VOID,
G_TYPE_NONE, 0);
/**
* GDrive::disconnected:
* @drive: a #GDrive.
*
* This signal is emitted when the #GDrive have been
* disconnected. If the recipient is holding references to the
* object they should release them so the object can be
* finalized.
**/
g_signal_new (I_("disconnected"),
G_TYPE_DRIVE,
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GDriveIface, disconnected),
NULL, NULL,
g_cclosure_marshal_VOID__VOID,
G_TYPE_NONE, 0);
/**
* GDrive::eject-button:
* @drive: a #GDrive.
*
* Emitted when the physical eject button (if any) of a drive has
* been pressed.
**/
g_signal_new (I_("eject-button"),
G_TYPE_DRIVE,
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GDriveIface, eject_button),
NULL, NULL,
g_cclosure_marshal_VOID__VOID,
G_TYPE_NONE, 0);
/**
* GDrive::stop-button:
* @drive: a #GDrive.
*
* Emitted when the physical stop button (if any) of a drive has
* been pressed.
*
* Since: 2.22
**/
g_signal_new (I_("stop-button"),
G_TYPE_DRIVE,
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GDriveIface, stop_button),
NULL, NULL,
g_cclosure_marshal_VOID__VOID,
G_TYPE_NONE, 0);
}
/**
* g_drive_get_name:
* @drive: a #GDrive.
*
* Gets the name of @drive.
*
* Returns: a string containing @drive's name. The returned
* string should be freed when no longer needed.
**/
char *
g_drive_get_name (GDrive *drive)
{
GDriveIface *iface;
g_return_val_if_fail (G_IS_DRIVE (drive), NULL);
iface = G_DRIVE_GET_IFACE (drive);
return (* iface->get_name) (drive);
}
/**
* g_drive_get_icon:
* @drive: a #GDrive.
*
* Gets the icon for @drive.
*
* Returns: (transfer full): #GIcon for the @drive.
* Free the returned object with g_object_unref().
**/
GIcon *
g_drive_get_icon (GDrive *drive)
{
GDriveIface *iface;
g_return_val_if_fail (G_IS_DRIVE (drive), NULL);
iface = G_DRIVE_GET_IFACE (drive);
return (* iface->get_icon) (drive);
}
/**
* g_drive_get_symbolic_icon:
* @drive: a #GDrive.
*
* Gets the icon for @drive.
*
* Returns: (transfer full): symbolic #GIcon for the @drive.
* Free the returned object with g_object_unref().
*
* Since: 2.34
**/
GIcon *
g_drive_get_symbolic_icon (GDrive *drive)
{
GDriveIface *iface;
GIcon *ret;
g_return_val_if_fail (G_IS_DRIVE (drive), NULL);
iface = G_DRIVE_GET_IFACE (drive);
if (iface->get_symbolic_icon != NULL)
ret = iface->get_symbolic_icon (drive);
else
ret = g_themed_icon_new_with_default_fallbacks ("drive-removable-media-symbolic");
return ret;
}
/**
* g_drive_has_volumes:
* @drive: a #GDrive.
*
* Check if @drive has any mountable volumes.
*
* Returns: %TRUE if the @drive contains volumes, %FALSE otherwise.
**/
gboolean
g_drive_has_volumes (GDrive *drive)
{
GDriveIface *iface;
g_return_val_if_fail (G_IS_DRIVE (drive), FALSE);
iface = G_DRIVE_GET_IFACE (drive);
return (* iface->has_volumes) (drive);
}
/**
* g_drive_get_volumes:
* @drive: a #GDrive.
*
* Get a list of mountable volumes for @drive.
*
* The returned list should be freed with g_list_free(), after
* its elements have been unreffed with g_object_unref().
*
* Returns: (element-type GVolume) (transfer full): #GList containing any #GVolume objects on the given @drive.
**/
GList *
g_drive_get_volumes (GDrive *drive)
{
GDriveIface *iface;
g_return_val_if_fail (G_IS_DRIVE (drive), NULL);
iface = G_DRIVE_GET_IFACE (drive);
return (* iface->get_volumes) (drive);
}
/**
* g_drive_is_media_check_automatic:
* @drive: a #GDrive.
*
* Checks if @drive is capabable of automatically detecting media changes.
*
* Returns: %TRUE if the @drive is capabable of automatically detecting
* media changes, %FALSE otherwise.
**/
gboolean
g_drive_is_media_check_automatic (GDrive *drive)
{
GDriveIface *iface;
g_return_val_if_fail (G_IS_DRIVE (drive), FALSE);
iface = G_DRIVE_GET_IFACE (drive);
return (* iface->is_media_check_automatic) (drive);
}
/**
* g_drive_is_media_removable:
* @drive: a #GDrive.
*
* Checks if the @drive supports removable media.
*
* Returns: %TRUE if @drive supports removable media, %FALSE otherwise.
**/
gboolean
g_drive_is_media_removable (GDrive *drive)
{
GDriveIface *iface;
g_return_val_if_fail (G_IS_DRIVE (drive), FALSE);
iface = G_DRIVE_GET_IFACE (drive);
return (* iface->is_media_removable) (drive);
}
/**
* g_drive_has_media:
* @drive: a #GDrive.
*
* Checks if the @drive has media. Note that the OS may not be polling
* the drive for media changes; see g_drive_is_media_check_automatic()
* for more details.
*
* Returns: %TRUE if @drive has media, %FALSE otherwise.
**/
gboolean
g_drive_has_media (GDrive *drive)
{
GDriveIface *iface;
g_return_val_if_fail (G_IS_DRIVE (drive), FALSE);
iface = G_DRIVE_GET_IFACE (drive);
return (* iface->has_media) (drive);
}
/**
* g_drive_can_eject:
* @drive: a #GDrive.
*
* Checks if a drive can be ejected.
*
* Returns: %TRUE if the @drive can be ejected, %FALSE otherwise.
**/
gboolean
g_drive_can_eject (GDrive *drive)
{
GDriveIface *iface;
g_return_val_if_fail (G_IS_DRIVE (drive), FALSE);
iface = G_DRIVE_GET_IFACE (drive);
if (iface->can_eject == NULL)
return FALSE;
return (* iface->can_eject) (drive);
}
/**
* g_drive_can_poll_for_media:
* @drive: a #GDrive.
*
* Checks if a drive can be polled for media changes.
*
* Returns: %TRUE if the @drive can be polled for media changes,
* %FALSE otherwise.
**/
gboolean
g_drive_can_poll_for_media (GDrive *drive)
{
GDriveIface *iface;
g_return_val_if_fail (G_IS_DRIVE (drive), FALSE);
iface = G_DRIVE_GET_IFACE (drive);
if (iface->poll_for_media == NULL)
return FALSE;
return (* iface->can_poll_for_media) (drive);
}
/**
* g_drive_eject:
* @drive: a #GDrive.
* @flags: flags affecting the unmount if required for eject
* @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
* @callback: (allow-none): a #GAsyncReadyCallback, or %NULL.
* @user_data: user data to pass to @callback
*
* Asynchronously ejects a drive.
*
* When the operation is finished, @callback will be called.
* You can then call g_drive_eject_finish() to obtain the
* result of the operation.
*
* Deprecated: 2.22: Use g_drive_eject_with_operation() instead.
**/
void
g_drive_eject (GDrive *drive,
GMountUnmountFlags flags,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data)
{
GDriveIface *iface;
g_return_if_fail (G_IS_DRIVE (drive));
iface = G_DRIVE_GET_IFACE (drive);
if (iface->eject == NULL)
{
g_task_report_new_error (drive, callback, user_data,
g_drive_eject_with_operation,
G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
_("drive doesn't implement eject"));
return;
}
(* iface->eject) (drive, flags, cancellable, callback, user_data);
}
/**
* g_drive_eject_finish:
* @drive: a #GDrive.
* @result: a #GAsyncResult.
* @error: a #GError, or %NULL
*
* Finishes ejecting a drive.
*
* Returns: %TRUE if the drive has been ejected successfully,
* %FALSE otherwise.
*
* Deprecated: 2.22: Use g_drive_eject_with_operation_finish() instead.
**/
gboolean
g_drive_eject_finish (GDrive *drive,
GAsyncResult *result,
GError **error)
{
GDriveIface *iface;
g_return_val_if_fail (G_IS_DRIVE (drive), FALSE);
g_return_val_if_fail (G_IS_ASYNC_RESULT (result), FALSE);
if (g_async_result_legacy_propagate_error (result, error))
return FALSE;
else if (g_async_result_is_tagged (result, g_drive_eject_with_operation))
return g_task_propagate_boolean (G_TASK (result), error);
iface = G_DRIVE_GET_IFACE (drive);
return (* iface->eject_finish) (drive, result, error);
}
/**
* g_drive_eject_with_operation:
* @drive: a #GDrive.
* @flags: flags affecting the unmount if required for eject
* @mount_operation: (allow-none): a #GMountOperation or %NULL to avoid
* user interaction.
* @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
* @callback: (allow-none): a #GAsyncReadyCallback, or %NULL.
* @user_data: user data passed to @callback.
*
* Ejects a drive. This is an asynchronous operation, and is
* finished by calling g_drive_eject_with_operation_finish() with the @drive
* and #GAsyncResult data returned in the @callback.
*
* Since: 2.22
**/
void
g_drive_eject_with_operation (GDrive *drive,
GMountUnmountFlags flags,
GMountOperation *mount_operation,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data)
{
GDriveIface *iface;
g_return_if_fail (G_IS_DRIVE (drive));
iface = G_DRIVE_GET_IFACE (drive);
if (iface->eject == NULL && iface->eject_with_operation == NULL)
{
g_task_report_new_error (drive, callback, user_data,
g_drive_eject_with_operation,
G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
/* Translators: This is an error
* message for drive objects that
* don't implement any of eject or eject_with_operation. */
_("drive doesn't implement eject or eject_with_operation"));
return;
}
if (iface->eject_with_operation != NULL)
(* iface->eject_with_operation) (drive, flags, mount_operation, cancellable, callback, user_data);
else
(* iface->eject) (drive, flags, cancellable, callback, user_data);
}
/**
* g_drive_eject_with_operation_finish:
* @drive: a #GDrive.
* @result: a #GAsyncResult.
* @error: a #GError location to store the error occurring, or %NULL to
* ignore.
*
* Finishes ejecting a drive. If any errors occurred during the operation,
* @error will be set to contain the errors and %FALSE will be returned.
*
* Returns: %TRUE if the drive was successfully ejected. %FALSE otherwise.
*
* Since: 2.22
**/
gboolean
g_drive_eject_with_operation_finish (GDrive *drive,
GAsyncResult *result,
GError **error)
{
GDriveIface *iface;
g_return_val_if_fail (G_IS_DRIVE (drive), FALSE);
g_return_val_if_fail (G_IS_ASYNC_RESULT (result), FALSE);
if (g_async_result_legacy_propagate_error (result, error))
return FALSE;
else if (g_async_result_is_tagged (result, g_drive_eject_with_operation))
return g_task_propagate_boolean (G_TASK (result), error);
iface = G_DRIVE_GET_IFACE (drive);
if (iface->eject_with_operation_finish != NULL)
return (* iface->eject_with_operation_finish) (drive, result, error);
else
return (* iface->eject_finish) (drive, result, error);
}
/**
* g_drive_poll_for_media:
* @drive: a #GDrive.
* @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
* @callback: (allow-none): a #GAsyncReadyCallback, or %NULL.
* @user_data: user data to pass to @callback
*
* Asynchronously polls @drive to see if media has been inserted or removed.
*
* When the operation is finished, @callback will be called.
* You can then call g_drive_poll_for_media_finish() to obtain the
* result of the operation.
**/
void
g_drive_poll_for_media (GDrive *drive,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data)
{
GDriveIface *iface;
g_return_if_fail (G_IS_DRIVE (drive));
iface = G_DRIVE_GET_IFACE (drive);
if (iface->poll_for_media == NULL)
{
g_task_report_new_error (drive, callback, user_data,
g_drive_poll_for_media,
G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
_("drive doesn't implement polling for media"));
return;
}
(* iface->poll_for_media) (drive, cancellable, callback, user_data);
}
/**
* g_drive_poll_for_media_finish:
* @drive: a #GDrive.
* @result: a #GAsyncResult.
* @error: a #GError, or %NULL
*
* Finishes an operation started with g_drive_poll_for_media() on a drive.
*
* Returns: %TRUE if the drive has been poll_for_mediaed successfully,
* %FALSE otherwise.
**/
gboolean
g_drive_poll_for_media_finish (GDrive *drive,
GAsyncResult *result,
GError **error)
{
GDriveIface *iface;
g_return_val_if_fail (G_IS_DRIVE (drive), FALSE);
g_return_val_if_fail (G_IS_ASYNC_RESULT (result), FALSE);
if (g_async_result_legacy_propagate_error (result, error))
return FALSE;
else if (g_async_result_is_tagged (result, g_drive_poll_for_media))
return g_task_propagate_boolean (G_TASK (result), error);
iface = G_DRIVE_GET_IFACE (drive);
return (* iface->poll_for_media_finish) (drive, result, error);
}
/**
* g_drive_get_identifier:
* @drive: a #GDrive
* @kind: the kind of identifier to return
*
* Gets the identifier of the given kind for @drive.
*
* Returns: a newly allocated string containing the
* requested identfier, or %NULL if the #GDrive
* doesn't have this kind of identifier.
*/
char *
g_drive_get_identifier (GDrive *drive,
const char *kind)
{
GDriveIface *iface;
g_return_val_if_fail (G_IS_DRIVE (drive), NULL);
g_return_val_if_fail (kind != NULL, NULL);
iface = G_DRIVE_GET_IFACE (drive);
if (iface->get_identifier == NULL)
return NULL;
return (* iface->get_identifier) (drive, kind);
}
/**
* g_drive_enumerate_identifiers:
* @drive: a #GDrive
*
* Gets the kinds of identifiers that @drive has.
* Use g_drive_get_identifier() to obtain the identifiers
* themselves.
*
* Returns: (transfer full) (array zero-terminated=1): a %NULL-terminated
* array of strings containing kinds of identifiers. Use g_strfreev()
* to free.
*/
char **
g_drive_enumerate_identifiers (GDrive *drive)
{
GDriveIface *iface;
g_return_val_if_fail (G_IS_DRIVE (drive), NULL);
iface = G_DRIVE_GET_IFACE (drive);
if (iface->enumerate_identifiers == NULL)
return NULL;
return (* iface->enumerate_identifiers) (drive);
}
/**
* g_drive_get_start_stop_type:
* @drive: a #GDrive.
*
* Gets a hint about how a drive can be started/stopped.
*
* Returns: A value from the #GDriveStartStopType enumeration.
*
* Since: 2.22
*/
GDriveStartStopType
g_drive_get_start_stop_type (GDrive *drive)
{
GDriveIface *iface;
g_return_val_if_fail (G_IS_DRIVE (drive), FALSE);
iface = G_DRIVE_GET_IFACE (drive);
if (iface->get_start_stop_type == NULL)
return G_DRIVE_START_STOP_TYPE_UNKNOWN;
return (* iface->get_start_stop_type) (drive);
}
/**
* g_drive_can_start:
* @drive: a #GDrive.
*
* Checks if a drive can be started.
*
* Returns: %TRUE if the @drive can be started, %FALSE otherwise.
*
* Since: 2.22
*/
gboolean
g_drive_can_start (GDrive *drive)
{
GDriveIface *iface;
g_return_val_if_fail (G_IS_DRIVE (drive), FALSE);
iface = G_DRIVE_GET_IFACE (drive);
if (iface->can_start == NULL)
return FALSE;
return (* iface->can_start) (drive);
}
/**
* g_drive_can_start_degraded:
* @drive: a #GDrive.
*
* Checks if a drive can be started degraded.
*
* Returns: %TRUE if the @drive can be started degraded, %FALSE otherwise.
*
* Since: 2.22
*/
gboolean
g_drive_can_start_degraded (GDrive *drive)
{
GDriveIface *iface;
g_return_val_if_fail (G_IS_DRIVE (drive), FALSE);
iface = G_DRIVE_GET_IFACE (drive);
if (iface->can_start_degraded == NULL)
return FALSE;
return (* iface->can_start_degraded) (drive);
}
/**
* g_drive_start:
* @drive: a #GDrive.
* @flags: flags affecting the start operation.
* @mount_operation: (allow-none): a #GMountOperation or %NULL to avoid
* user interaction.
* @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
* @callback: (allow-none): a #GAsyncReadyCallback, or %NULL.
* @user_data: user data to pass to @callback
*
* Asynchronously starts a drive.
*
* When the operation is finished, @callback will be called.
* You can then call g_drive_start_finish() to obtain the
* result of the operation.
*
* Since: 2.22
*/
void
g_drive_start (GDrive *drive,
GDriveStartFlags flags,
GMountOperation *mount_operation,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data)
{
GDriveIface *iface;
g_return_if_fail (G_IS_DRIVE (drive));
iface = G_DRIVE_GET_IFACE (drive);
if (iface->start == NULL)
{
g_task_report_new_error (drive, callback, user_data,
g_drive_start,
G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
_("drive doesn't implement start"));
return;
}
(* iface->start) (drive, flags, mount_operation, cancellable, callback, user_data);
}
/**
* g_drive_start_finish:
* @drive: a #GDrive.
* @result: a #GAsyncResult.
* @error: a #GError, or %NULL
*
* Finishes starting a drive.
*
* Returns: %TRUE if the drive has been started successfully,
* %FALSE otherwise.
*
* Since: 2.22
*/
gboolean
g_drive_start_finish (GDrive *drive,
GAsyncResult *result,
GError **error)
{
GDriveIface *iface;
g_return_val_if_fail (G_IS_DRIVE (drive), FALSE);
g_return_val_if_fail (G_IS_ASYNC_RESULT (result), FALSE);
if (g_async_result_legacy_propagate_error (result, error))
return FALSE;
else if (g_async_result_is_tagged (result, g_drive_start))
return g_task_propagate_boolean (G_TASK (result), error);
iface = G_DRIVE_GET_IFACE (drive);
return (* iface->start_finish) (drive, result, error);
}
/**
* g_drive_can_stop:
* @drive: a #GDrive.
*
* Checks if a drive can be stopped.
*
* Returns: %TRUE if the @drive can be stopped, %FALSE otherwise.
*
* Since: 2.22
*/
gboolean
g_drive_can_stop (GDrive *drive)
{
GDriveIface *iface;
g_return_val_if_fail (G_IS_DRIVE (drive), FALSE);
iface = G_DRIVE_GET_IFACE (drive);
if (iface->can_stop == NULL)
return FALSE;
return (* iface->can_stop) (drive);
}
/**
* g_drive_stop:
* @drive: a #GDrive.
* @flags: flags affecting the unmount if required for stopping.
* @mount_operation: (allow-none): a #GMountOperation or %NULL to avoid
* user interaction.
* @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
* @callback: (allow-none): a #GAsyncReadyCallback, or %NULL.
* @user_data: user data to pass to @callback
*
* Asynchronously stops a drive.
*
* When the operation is finished, @callback will be called.
* You can then call g_drive_stop_finish() to obtain the
* result of the operation.
*
* Since: 2.22
*/
void
g_drive_stop (GDrive *drive,
GMountUnmountFlags flags,
GMountOperation *mount_operation,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data)
{
GDriveIface *iface;
g_return_if_fail (G_IS_DRIVE (drive));
iface = G_DRIVE_GET_IFACE (drive);
if (iface->stop == NULL)
{
g_task_report_new_error (drive, callback, user_data,
g_drive_start,
G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
_("drive doesn't implement stop"));
return;
}
(* iface->stop) (drive, flags, mount_operation, cancellable, callback, user_data);
}
/**
* g_drive_stop_finish:
* @drive: a #GDrive.
* @result: a #GAsyncResult.
* @error: a #GError, or %NULL
*
* Finishes stopping a drive.
*
* Returns: %TRUE if the drive has been stopped successfully,
* %FALSE otherwise.
*
* Since: 2.22
*/
gboolean
g_drive_stop_finish (GDrive *drive,
GAsyncResult *result,
GError **error)
{
GDriveIface *iface;
g_return_val_if_fail (G_IS_DRIVE (drive), FALSE);
g_return_val_if_fail (G_IS_ASYNC_RESULT (result), FALSE);
if (g_async_result_legacy_propagate_error (result, error))
return FALSE;
else if (g_async_result_is_tagged (result, g_drive_start))
return g_task_propagate_boolean (G_TASK (result), error);
iface = G_DRIVE_GET_IFACE (drive);
return (* iface->stop_finish) (drive, result, error);
}
/**
* g_drive_get_sort_key:
* @drive: A #GDrive.
*
* Gets the sort key for @drive, if any.
*
* Returns: Sorting key for @drive or %NULL if no such key is available.
*
* Since: 2.32
*/
const gchar *
g_drive_get_sort_key (GDrive *drive)
{
const gchar *ret = NULL;
GDriveIface *iface;
g_return_val_if_fail (G_IS_DRIVE (drive), NULL);
iface = G_DRIVE_GET_IFACE (drive);
if (iface->get_sort_key != NULL)
ret = iface->get_sort_key (drive);
return ret;
}