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glib/gio/gmount.c
Philip Withnall b4332b0056 docs: Clarify distinction between GDrive, GVolume and GMount 
Provide examples of what they all represent, and expand on the
descriptions of them in a few places.

Move references to their equivalents from `GnomeVFS` to lower down in
the documentation, since `GnomeVFS` has been deprecated for many years
now, and is unlikely to be pertinent to most readers.

Signed-off-by: Philip Withnall <pwithnall@gnome.org>
2024-08-15 11:32:37 +01:00

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/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
/* GIO - GLib Input, Output and Streaming Library
*
* Copyright (C) 2006-2008 Red Hat, Inc.
*
* SPDX-License-Identifier: LGPL-2.1-or-later
*
* 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 2.1 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 <http://www.gnu.org/licenses/>.
*
* Author: Alexander Larsson <alexl@redhat.com>
* David Zeuthen <davidz@redhat.com>
*/
#include "config.h"
#include <string.h>
#include "gmount.h"
#include "gmountprivate.h"
#include "gthemedicon.h"
#include "gasyncresult.h"
#include "gtask.h"
#include "gioerror.h"
#include "glibintl.h"
/**
* GMount:
*
* The `GMount` interface represents a user-visible mount, such as a mounted
* file system.
*
* `GMount` is a ‘mounted’ filesystem that you can access. Mounted is in
* quotes because it’s not the same as a UNIX mount, it might be a GVFS
* mount, but you can still access the files on it if you use GIO.
*
* A `GMount` might be associated with a [iface@Gio.Volume] (such as a USB flash
* drive) which hosts it.
*
* Unmounting a `GMount` instance is an asynchronous operation. For
* more information about asynchronous operations, see [iface@Gio.AsyncResult]
* and [class@Gio.Task]. To unmount a `GMount` instance, first call
* [method@Gio.Mount.unmount_with_operation] with (at least) the `GMount`
* instance and a [type@Gio.AsyncReadyCallback]. The callback will be fired
* when the operation has resolved (either with success or failure), and a
* [iface@Gio.AsyncResult] structure will be passed to the callback. That
* callback should then call [method@Gio.Mount.unmount_with_operation_finish]
* with the `GMount` and the [iface@Gio.AsyncResult] data to see if the
* operation was completed successfully. If an `error` is present when
* [method@Gio.Mount.unmount_with_operation_finish] is called, then it will be
* filled with any error information.
*
* Note, when [porting from GnomeVFS](migrating-gnome-vfs.html), `GMount` is the
* moral equivalent of `GnomeVFSVolume`.
**/
typedef GMountIface GMountInterface;
G_DEFINE_INTERFACE (GMount, g_mount, G_TYPE_OBJECT)
static void
g_mount_default_init (GMountInterface *iface)
{
/**
* GMount::changed:
* @mount: the object on which the signal is emitted
*
* Emitted when the mount has been changed.
**/
g_signal_new (I_("changed"),
G_TYPE_MOUNT,
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GMountIface, changed),
NULL, NULL,
NULL,
G_TYPE_NONE, 0);
/**
* GMount::unmounted:
* @mount: the object on which the signal is emitted
*
* This signal is emitted when the #GMount have been
* unmounted. If the recipient is holding references to the
* object they should release them so the object can be
* finalized.
**/
g_signal_new (I_("unmounted"),
G_TYPE_MOUNT,
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GMountIface, unmounted),
NULL, NULL,
NULL,
G_TYPE_NONE, 0);
/**
* GMount::pre-unmount:
* @mount: the object on which the signal is emitted
*
* This signal may be emitted when the #GMount is about to be
* unmounted.
*
* This signal depends on the backend and is only emitted if
* GIO was used to unmount.
*
* Since: 2.22
**/
g_signal_new (I_("pre-unmount"),
G_TYPE_MOUNT,
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GMountIface, pre_unmount),
NULL, NULL,
NULL,
G_TYPE_NONE, 0);
}
/**
* g_mount_get_root:
* @mount: a #GMount.
*
* Gets the root directory on @mount.
*
* Returns: (transfer full): a #GFile.
* The returned object should be unreffed with
* g_object_unref() when no longer needed.
**/
GFile *
g_mount_get_root (GMount *mount)
{
GMountIface *iface;
g_return_val_if_fail (G_IS_MOUNT (mount), NULL);
iface = G_MOUNT_GET_IFACE (mount);
return (* iface->get_root) (mount);
}
/**
* g_mount_get_default_location:
* @mount: a #GMount.
*
* Gets the default location of @mount. The default location of the given
* @mount is a path that reflects the main entry point for the user (e.g.
* the home directory, or the root of the volume).
*
* Returns: (transfer full): a #GFile.
* The returned object should be unreffed with
* g_object_unref() when no longer needed.
**/
GFile *
g_mount_get_default_location (GMount *mount)
{
GMountIface *iface;
GFile *file;
g_return_val_if_fail (G_IS_MOUNT (mount), NULL);
iface = G_MOUNT_GET_IFACE (mount);
/* Fallback to get_root when default_location () is not available */
if (iface->get_default_location)
file = (* iface->get_default_location) (mount);
else
file = (* iface->get_root) (mount);
return file;
}
/**
* g_mount_get_name:
* @mount: a #GMount.
*
* Gets the name of @mount.
*
* Returns: the name for the given @mount.
* The returned string should be freed with g_free()
* when no longer needed.
**/
char *
g_mount_get_name (GMount *mount)
{
GMountIface *iface;
g_return_val_if_fail (G_IS_MOUNT (mount), NULL);
iface = G_MOUNT_GET_IFACE (mount);
return (* iface->get_name) (mount);
}
/**
* g_mount_get_icon:
* @mount: a #GMount.
*
* Gets the icon for @mount.
*
* Returns: (transfer full): a #GIcon.
* The returned object should be unreffed with
* g_object_unref() when no longer needed.
**/
GIcon *
g_mount_get_icon (GMount *mount)
{
GMountIface *iface;
g_return_val_if_fail (G_IS_MOUNT (mount), NULL);
iface = G_MOUNT_GET_IFACE (mount);
return (* iface->get_icon) (mount);
}
/**
* g_mount_get_symbolic_icon:
* @mount: a #GMount.
*
* Gets the symbolic icon for @mount.
*
* Returns: (transfer full): a #GIcon.
* The returned object should be unreffed with
* g_object_unref() when no longer needed.
*
* Since: 2.34
**/
GIcon *
g_mount_get_symbolic_icon (GMount *mount)
{
GMountIface *iface;
GIcon *ret;
g_return_val_if_fail (G_IS_MOUNT (mount), NULL);
iface = G_MOUNT_GET_IFACE (mount);
if (iface->get_symbolic_icon != NULL)
ret = iface->get_symbolic_icon (mount);
else
ret = g_themed_icon_new_with_default_fallbacks ("folder-remote-symbolic");
return ret;
}
/**
* g_mount_get_uuid:
* @mount: a #GMount.
*
* Gets the UUID for the @mount. The reference is typically based on
* the file system UUID for the mount in question and should be
* considered an opaque string. Returns %NULL if there is no UUID
* available.
*
* Returns: (nullable) (transfer full): the UUID for @mount or %NULL if no UUID
* can be computed.
* The returned string should be freed with g_free()
* when no longer needed.
**/
char *
g_mount_get_uuid (GMount *mount)
{
GMountIface *iface;
g_return_val_if_fail (G_IS_MOUNT (mount), NULL);
iface = G_MOUNT_GET_IFACE (mount);
return (* iface->get_uuid) (mount);
}
/**
* g_mount_get_volume:
* @mount: a #GMount.
*
* Gets the volume for the @mount.
*
* Returns: (transfer full) (nullable): a #GVolume or %NULL if @mount is not
* associated with a volume.
* The returned object should be unreffed with
* g_object_unref() when no longer needed.
**/
GVolume *
g_mount_get_volume (GMount *mount)
{
GMountIface *iface;
g_return_val_if_fail (G_IS_MOUNT (mount), NULL);
iface = G_MOUNT_GET_IFACE (mount);
return (* iface->get_volume) (mount);
}
/**
* g_mount_get_drive:
* @mount: a #GMount.
*
* Gets the drive for the @mount.
*
* This is a convenience method for getting the #GVolume and then
* using that object to get the #GDrive.
*
* Returns: (transfer full) (nullable): a #GDrive or %NULL if @mount is not
* associated with a volume or a drive.
* The returned object should be unreffed with
* g_object_unref() when no longer needed.
**/
GDrive *
g_mount_get_drive (GMount *mount)
{
GMountIface *iface;
g_return_val_if_fail (G_IS_MOUNT (mount), NULL);
iface = G_MOUNT_GET_IFACE (mount);
return (* iface->get_drive) (mount);
}
/**
* g_mount_can_unmount:
* @mount: a #GMount.
*
* Checks if @mount can be unmounted.
*
* Returns: %TRUE if the @mount can be unmounted.
**/
gboolean
g_mount_can_unmount (GMount *mount)
{
GMountIface *iface;
g_return_val_if_fail (G_IS_MOUNT (mount), FALSE);
iface = G_MOUNT_GET_IFACE (mount);
return (* iface->can_unmount) (mount);
}
/**
* g_mount_can_eject:
* @mount: a #GMount.
*
* Checks if @mount can be ejected.
*
* Returns: %TRUE if the @mount can be ejected.
**/
gboolean
g_mount_can_eject (GMount *mount)
{
GMountIface *iface;
g_return_val_if_fail (G_IS_MOUNT (mount), FALSE);
iface = G_MOUNT_GET_IFACE (mount);
return (* iface->can_eject) (mount);
}
/**
* g_mount_unmount:
* @mount: a #GMount.
* @flags: flags affecting the operation
* @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
* @callback: (nullable): a #GAsyncReadyCallback, or %NULL.
* @user_data: user data passed to @callback.
*
* Unmounts a mount. This is an asynchronous operation, and is
* finished by calling g_mount_unmount_finish() with the @mount
* and #GAsyncResult data returned in the @callback.
*
* Deprecated: 2.22: Use g_mount_unmount_with_operation() instead.
**/
void
g_mount_unmount (GMount *mount,
GMountUnmountFlags flags,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data)
{
GMountIface *iface;
g_return_if_fail (G_IS_MOUNT (mount));
iface = G_MOUNT_GET_IFACE (mount);
if (iface->unmount == NULL)
{
g_task_report_new_error (mount, callback, user_data,
g_mount_unmount_with_operation,
G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
/* Translators: This is an error
* message for mount objects that
* don't implement unmount. */
_("mount doesn’t implement “unmount”"));
return;
}
(* iface->unmount) (mount, flags, cancellable, callback, user_data);
}
/**
* g_mount_unmount_finish:
* @mount: a #GMount.
* @result: a #GAsyncResult.
* @error: a #GError location to store the error occurring, or %NULL to
* ignore.
*
* Finishes unmounting a mount. If any errors occurred during the operation,
* @error will be set to contain the errors and %FALSE will be returned.
*
* Returns: %TRUE if the mount was successfully unmounted. %FALSE otherwise.
*
* Deprecated: 2.22: Use g_mount_unmount_with_operation_finish() instead.
**/
gboolean
g_mount_unmount_finish (GMount *mount,
GAsyncResult *result,
GError **error)
{
GMountIface *iface;
g_return_val_if_fail (G_IS_MOUNT (mount), 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_mount_unmount_with_operation))
return g_task_propagate_boolean (G_TASK (result), error);
iface = G_MOUNT_GET_IFACE (mount);
return (* iface->unmount_finish) (mount, result, error);
}
/**
* g_mount_eject:
* @mount: a #GMount.
* @flags: flags affecting the unmount if required for eject
* @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
* @callback: (nullable): a #GAsyncReadyCallback, or %NULL.
* @user_data: user data passed to @callback.
*
* Ejects a mount. This is an asynchronous operation, and is
* finished by calling g_mount_eject_finish() with the @mount
* and #GAsyncResult data returned in the @callback.
*
* Deprecated: 2.22: Use g_mount_eject_with_operation() instead.
**/
void
g_mount_eject (GMount *mount,
GMountUnmountFlags flags,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data)
{
GMountIface *iface;
g_return_if_fail (G_IS_MOUNT (mount));
iface = G_MOUNT_GET_IFACE (mount);
if (iface->eject == NULL)
{
g_task_report_new_error (mount, callback, user_data,
g_mount_eject_with_operation,
G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
/* Translators: This is an error
* message for mount objects that
* don't implement eject. */
_("mount doesn’t implement “eject”"));
return;
}
(* iface->eject) (mount, flags, cancellable, callback, user_data);
}
/**
* g_mount_eject_finish:
* @mount: a #GMount.
* @result: a #GAsyncResult.
* @error: a #GError location to store the error occurring, or %NULL to
* ignore.
*
* Finishes ejecting a mount. If any errors occurred during the operation,
* @error will be set to contain the errors and %FALSE will be returned.
*
* Returns: %TRUE if the mount was successfully ejected. %FALSE otherwise.
*
* Deprecated: 2.22: Use g_mount_eject_with_operation_finish() instead.
**/
gboolean
g_mount_eject_finish (GMount *mount,
GAsyncResult *result,
GError **error)
{
GMountIface *iface;
g_return_val_if_fail (G_IS_MOUNT (mount), 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_mount_eject_with_operation))
return g_task_propagate_boolean (G_TASK (result), error);
iface = G_MOUNT_GET_IFACE (mount);
return (* iface->eject_finish) (mount, result, error);
}
/**
* g_mount_unmount_with_operation:
* @mount: a #GMount.
* @flags: flags affecting the operation
* @mount_operation: (nullable): a #GMountOperation or %NULL to avoid
* user interaction.
* @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
* @callback: (nullable): a #GAsyncReadyCallback, or %NULL.
* @user_data: user data passed to @callback.
*
* Unmounts a mount. This is an asynchronous operation, and is
* finished by calling g_mount_unmount_with_operation_finish() with the @mount
* and #GAsyncResult data returned in the @callback.
*
* Since: 2.22
**/
void
g_mount_unmount_with_operation (GMount *mount,
GMountUnmountFlags flags,
GMountOperation *mount_operation,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data)
{
GMountIface *iface;
g_return_if_fail (G_IS_MOUNT (mount));
iface = G_MOUNT_GET_IFACE (mount);
if (iface->unmount == NULL && iface->unmount_with_operation == NULL)
{
g_task_report_new_error (mount, callback, user_data,
g_mount_unmount_with_operation,
G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
/* Translators: This is an error
* message for mount objects that
* don't implement any of unmount or unmount_with_operation. */
_("mount doesn’t implement “unmount” or “unmount_with_operation”"));
return;
}
if (iface->unmount_with_operation != NULL)
(* iface->unmount_with_operation) (mount, flags, mount_operation, cancellable, callback, user_data);
else
(* iface->unmount) (mount, flags, cancellable, callback, user_data);
}
/**
* g_mount_unmount_with_operation_finish:
* @mount: a #GMount.
* @result: a #GAsyncResult.
* @error: a #GError location to store the error occurring, or %NULL to
* ignore.
*
* Finishes unmounting a mount. If any errors occurred during the operation,
* @error will be set to contain the errors and %FALSE will be returned.
*
* Returns: %TRUE if the mount was successfully unmounted. %FALSE otherwise.
*
* Since: 2.22
**/
gboolean
g_mount_unmount_with_operation_finish (GMount *mount,
GAsyncResult *result,
GError **error)
{
GMountIface *iface;
g_return_val_if_fail (G_IS_MOUNT (mount), 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_mount_unmount_with_operation))
return g_task_propagate_boolean (G_TASK (result), error);
iface = G_MOUNT_GET_IFACE (mount);
if (iface->unmount_with_operation_finish != NULL)
return (* iface->unmount_with_operation_finish) (mount, result, error);
else
return (* iface->unmount_finish) (mount, result, error);
}
/**
* g_mount_eject_with_operation:
* @mount: a #GMount.
* @flags: flags affecting the unmount if required for eject
* @mount_operation: (nullable): a #GMountOperation or %NULL to avoid
* user interaction.
* @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
* @callback: (nullable): a #GAsyncReadyCallback, or %NULL.
* @user_data: user data passed to @callback.
*
* Ejects a mount. This is an asynchronous operation, and is
* finished by calling g_mount_eject_with_operation_finish() with the @mount
* and #GAsyncResult data returned in the @callback.
*
* Since: 2.22
**/
void
g_mount_eject_with_operation (GMount *mount,
GMountUnmountFlags flags,
GMountOperation *mount_operation,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data)
{
GMountIface *iface;
g_return_if_fail (G_IS_MOUNT (mount));
iface = G_MOUNT_GET_IFACE (mount);
if (iface->eject == NULL && iface->eject_with_operation == NULL)
{
g_task_report_new_error (mount, callback, user_data,
g_mount_eject_with_operation,
G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
/* Translators: This is an error
* message for mount objects that
* don't implement any of eject or eject_with_operation. */
_("mount doesn’t implement “eject” or “eject_with_operation”"));
return;
}
if (iface->eject_with_operation != NULL)
(* iface->eject_with_operation) (mount, flags, mount_operation, cancellable, callback, user_data);
else
(* iface->eject) (mount, flags, cancellable, callback, user_data);
}
/**
* g_mount_eject_with_operation_finish:
* @mount: a #GMount.
* @result: a #GAsyncResult.
* @error: a #GError location to store the error occurring, or %NULL to
* ignore.
*
* Finishes ejecting a mount. If any errors occurred during the operation,
* @error will be set to contain the errors and %FALSE will be returned.
*
* Returns: %TRUE if the mount was successfully ejected. %FALSE otherwise.
*
* Since: 2.22
**/
gboolean
g_mount_eject_with_operation_finish (GMount *mount,
GAsyncResult *result,
GError **error)
{
GMountIface *iface;
g_return_val_if_fail (G_IS_MOUNT (mount), 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_mount_eject_with_operation))
return g_task_propagate_boolean (G_TASK (result), error);
iface = G_MOUNT_GET_IFACE (mount);
if (iface->eject_with_operation_finish != NULL)
return (* iface->eject_with_operation_finish) (mount, result, error);
else
return (* iface->eject_finish) (mount, result, error);
}
/**
* g_mount_remount:
* @mount: a #GMount.
* @flags: flags affecting the operation
* @mount_operation: (nullable): a #GMountOperation or %NULL to avoid
* user interaction.
* @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
* @callback: (nullable): a #GAsyncReadyCallback, or %NULL.
* @user_data: user data passed to @callback.
*
* Remounts a mount. This is an asynchronous operation, and is
* finished by calling g_mount_remount_finish() with the @mount
* and #GAsyncResults data returned in the @callback.
*
* Remounting is useful when some setting affecting the operation
* of the volume has been changed, as these may need a remount to
* take affect. While this is semantically equivalent with unmounting
* and then remounting not all backends might need to actually be
* unmounted.
**/
void
g_mount_remount (GMount *mount,
GMountMountFlags flags,
GMountOperation *mount_operation,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data)
{
GMountIface *iface;
g_return_if_fail (G_IS_MOUNT (mount));
iface = G_MOUNT_GET_IFACE (mount);
if (iface->remount == NULL)
{
g_task_report_new_error (mount, callback, user_data,
g_mount_remount,
G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
/* Translators: This is an error
* message for mount objects that
* don't implement remount. */
_("mount doesn’t implement “remount”"));
return;
}
(* iface->remount) (mount, flags, mount_operation, cancellable, callback, user_data);
}
/**
* g_mount_remount_finish:
* @mount: a #GMount.
* @result: a #GAsyncResult.
* @error: a #GError location to store the error occurring, or %NULL to
* ignore.
*
* Finishes remounting a mount. If any errors occurred during the operation,
* @error will be set to contain the errors and %FALSE will be returned.
*
* Returns: %TRUE if the mount was successfully remounted. %FALSE otherwise.
**/
gboolean
g_mount_remount_finish (GMount *mount,
GAsyncResult *result,
GError **error)
{
GMountIface *iface;
g_return_val_if_fail (G_IS_MOUNT (mount), 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_mount_remount))
return g_task_propagate_boolean (G_TASK (result), error);
iface = G_MOUNT_GET_IFACE (mount);
return (* iface->remount_finish) (mount, result, error);
}
/**
* g_mount_guess_content_type:
* @mount: a #GMount
* @force_rescan: Whether to force a rescan of the content.
* Otherwise a cached result will be used if available
* @cancellable: (nullable): optional #GCancellable object, %NULL to ignore
* @callback: a #GAsyncReadyCallback
* @user_data: user data passed to @callback
*
* Tries to guess the type of content stored on @mount. Returns one or
* more textual identifiers of well-known content types (typically
* prefixed with "x-content/"), e.g. x-content/image-dcf for camera
* memory cards. See the
* [shared-mime-info](http://www.freedesktop.org/wiki/Specifications/shared-mime-info-spec)
* specification for more on x-content types.
*
* This is an asynchronous operation (see
* g_mount_guess_content_type_sync() for the synchronous version), and
* is finished by calling g_mount_guess_content_type_finish() with the
* @mount and #GAsyncResult data returned in the @callback.
*
* Since: 2.18
*/
void
g_mount_guess_content_type (GMount *mount,
gboolean force_rescan,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data)
{
GMountIface *iface;
g_return_if_fail (G_IS_MOUNT (mount));
iface = G_MOUNT_GET_IFACE (mount);
if (iface->guess_content_type == NULL)
{
g_task_report_new_error (mount, callback, user_data,
g_mount_guess_content_type,
G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
/* Translators: This is an error
* message for mount objects that
* don't implement content type guessing. */
_("mount doesn’t implement content type guessing"));
return;
}
(* iface->guess_content_type) (mount, force_rescan, cancellable, callback, user_data);
}
/**
* g_mount_guess_content_type_finish:
* @mount: a #GMount
* @result: a #GAsyncResult
* @error: a #GError location to store the error occurring, or %NULL to
* ignore
*
* Finishes guessing content types of @mount. If any errors occurred
* during the operation, @error will be set to contain the errors and
* %FALSE will be returned. In particular, you may get an
* %G_IO_ERROR_NOT_SUPPORTED if the mount does not support content
* guessing.
*
* Returns: (transfer full) (element-type utf8): a %NULL-terminated array of content types or %NULL on error.
* Caller should free this array with g_strfreev() when done with it.
*
* Since: 2.18
**/
gchar **
g_mount_guess_content_type_finish (GMount *mount,
GAsyncResult *result,
GError **error)
{
GMountIface *iface;
g_return_val_if_fail (G_IS_MOUNT (mount), NULL);
g_return_val_if_fail (G_IS_ASYNC_RESULT (result), NULL);
if (g_async_result_legacy_propagate_error (result, error))
return NULL;
else if (g_async_result_is_tagged (result, g_mount_guess_content_type))
return g_task_propagate_pointer (G_TASK (result), error);
iface = G_MOUNT_GET_IFACE (mount);
return (* iface->guess_content_type_finish) (mount, result, error);
}
/**
* g_mount_guess_content_type_sync:
* @mount: a #GMount
* @force_rescan: Whether to force a rescan of the content.
* Otherwise a cached result will be used if available
* @cancellable: (nullable): optional #GCancellable object, %NULL to ignore
* @error: a #GError location to store the error occurring, or %NULL to
* ignore
*
* Tries to guess the type of content stored on @mount. Returns one or
* more textual identifiers of well-known content types (typically
* prefixed with "x-content/"), e.g. x-content/image-dcf for camera
* memory cards. See the
* [shared-mime-info](http://www.freedesktop.org/wiki/Specifications/shared-mime-info-spec)
* specification for more on x-content types.
*
* This is a synchronous operation and as such may block doing IO;
* see g_mount_guess_content_type() for the asynchronous version.
*
* Returns: (transfer full) (element-type utf8): a %NULL-terminated array of content types or %NULL on error.
* Caller should free this array with g_strfreev() when done with it.
*
* Since: 2.18
*/
char **
g_mount_guess_content_type_sync (GMount *mount,
gboolean force_rescan,
GCancellable *cancellable,
GError **error)
{
GMountIface *iface;
g_return_val_if_fail (G_IS_MOUNT (mount), NULL);
iface = G_MOUNT_GET_IFACE (mount);
if (iface->guess_content_type_sync == NULL)
{
g_set_error_literal (error,
G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
/* Translators: This is an error
* message for mount objects that
* don't implement content type guessing. */
_("mount doesn’t implement synchronous content type guessing"));
return NULL;
}
return (* iface->guess_content_type_sync) (mount, force_rescan, cancellable, error);
}
G_LOCK_DEFINE_STATIC (priv_lock);
/* only access this structure when holding priv_lock */
typedef struct
{
gint shadow_ref_count;
} GMountPrivate;
static void
free_private (GMountPrivate *private)
{
G_LOCK (priv_lock);
g_free (private);
G_UNLOCK (priv_lock);
}
/* may only be called when holding priv_lock */
static GMountPrivate *
get_private (GMount *mount)
{
GMountPrivate *private;
private = g_object_get_data (G_OBJECT (mount), "g-mount-private");
if (G_LIKELY (private != NULL))
goto out;
private = g_new0 (GMountPrivate, 1);
g_object_set_data_full (G_OBJECT (mount),
"g-mount-private",
private,
(GDestroyNotify) free_private);
out:
return private;
}
/**
* g_mount_is_shadowed:
* @mount: A #GMount.
*
* Determines if @mount is shadowed. Applications or libraries should
* avoid displaying @mount in the user interface if it is shadowed.
*
* A mount is said to be shadowed if there exists one or more user
* visible objects (currently #GMount objects) with a root that is
* inside the root of @mount.
*
* One application of shadow mounts is when exposing a single file
* system that is used to address several logical volumes. In this
* situation, a #GVolumeMonitor implementation would create two
* #GVolume objects (for example, one for the camera functionality of
* the device and one for a SD card reader on the device) with
* activation URIs `gphoto2://[usb:001,002]/store1/`
* and `gphoto2://[usb:001,002]/store2/`. When the
* underlying mount (with root
* `gphoto2://[usb:001,002]/`) is mounted, said
* #GVolumeMonitor implementation would create two #GMount objects
* (each with their root matching the corresponding volume activation
* root) that would shadow the original mount.
*
* The proxy monitor in GVfs 2.26 and later, automatically creates and
* manage shadow mounts (and shadows the underlying mount) if the
* activation root on a #GVolume is set.
*
* Returns: %TRUE if @mount is shadowed.
*
* Since: 2.20
**/
gboolean
g_mount_is_shadowed (GMount *mount)
{
GMountPrivate *priv;
gboolean ret;
g_return_val_if_fail (G_IS_MOUNT (mount), FALSE);
G_LOCK (priv_lock);
priv = get_private (mount);
ret = (priv->shadow_ref_count > 0);
G_UNLOCK (priv_lock);
return ret;
}
/**
* g_mount_shadow:
* @mount: A #GMount.
*
* Increments the shadow count on @mount. Usually used by
* #GVolumeMonitor implementations when creating a shadow mount for
* @mount, see g_mount_is_shadowed() for more information. The caller
* will need to emit the #GMount::changed signal on @mount manually.
*
* Since: 2.20
**/
void
g_mount_shadow (GMount *mount)
{
GMountPrivate *priv;
g_return_if_fail (G_IS_MOUNT (mount));
G_LOCK (priv_lock);
priv = get_private (mount);
priv->shadow_ref_count += 1;
G_UNLOCK (priv_lock);
}
/**
* g_mount_unshadow:
* @mount: A #GMount.
*
* Decrements the shadow count on @mount. Usually used by
* #GVolumeMonitor implementations when destroying a shadow mount for
* @mount, see g_mount_is_shadowed() for more information. The caller
* will need to emit the #GMount::changed signal on @mount manually.
*
* Since: 2.20
**/
void
g_mount_unshadow (GMount *mount)
{
GMountPrivate *priv;
g_return_if_fail (G_IS_MOUNT (mount));
G_LOCK (priv_lock);
priv = get_private (mount);
priv->shadow_ref_count -= 1;
if (priv->shadow_ref_count < 0)
g_warning ("Shadow ref count on GMount is negative");
G_UNLOCK (priv_lock);
}
/**
* g_mount_get_sort_key:
* @mount: A #GMount.
*
* Gets the sort key for @mount, if any.
*
* Returns: (nullable): Sorting key for @mount or %NULL if no such key is available.
*
* Since: 2.32
*/
const gchar *
g_mount_get_sort_key (GMount *mount)
{
const gchar *ret = NULL;
GMountIface *iface;
g_return_val_if_fail (G_IS_MOUNT (mount), NULL);
iface = G_MOUNT_GET_IFACE (mount);
if (iface->get_sort_key != NULL)
ret = iface->get_sort_key (mount);
return ret;
}
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