GVolume

GVolume — Volume management

Synopsis


#include <gio/gio.h>

                    GVolume;
                    GVolumeIface;
char *              g_volume_get_name                   (GVolume *volume);
char *              g_volume_get_uuid                   (GVolume *volume);
GIcon *             g_volume_get_icon                   (GVolume *volume);
GDrive *            g_volume_get_drive                  (GVolume *volume);
GMount *            g_volume_get_mount                  (GVolume *volume);
gboolean            g_volume_can_mount                  (GVolume *volume);
gboolean            g_volume_should_automount           (GVolume *volume);
GFile *             g_volume_get_activation_root        (GVolume *volume);
void                g_volume_mount                      (GVolume *volume,
                                                         GMountMountFlags flags,
                                                         GMountOperation *mount_operation,
                                                         GCancellable *cancellable,
                                                         GAsyncReadyCallback callback,
                                                         gpointer user_data);
gboolean            g_volume_mount_finish               (GVolume *volume,
                                                         GAsyncResult *result,
                                                         GError **error);
gboolean            g_volume_can_eject                  (GVolume *volume);
void                g_volume_eject                      (GVolume *volume,
                                                         GMountUnmountFlags flags,
                                                         GCancellable *cancellable,
                                                         GAsyncReadyCallback callback,
                                                         gpointer user_data);
gboolean            g_volume_eject_finish               (GVolume *volume,
                                                         GAsyncResult *result,
                                                         GError **error);
#define             G_VOLUME_IDENTIFIER_KIND_HAL_UDI
#define             G_VOLUME_IDENTIFIER_KIND_LABEL
#define             G_VOLUME_IDENTIFIER_KIND_NFS_MOUNT
#define             G_VOLUME_IDENTIFIER_KIND_UNIX_DEVICE
#define             G_VOLUME_IDENTIFIER_KIND_UUID
char **             g_volume_enumerate_identifiers      (GVolume *volume);
char *              g_volume_get_identifier             (GVolume *volume,
                                                         const char *kind);

Object Hierarchy

  GInterface
   +----GVolume

Prerequisites

GVolume requires GObject.

Signals

  "changed"                                        : Run Last
  "removed"                                        : Run Last

Description

The GVolume interface represents user-visible objects that can be mounted. Note, when porting from GnomeVFS, GVolume is the moral equivalent of GnomeVFSDrive.

Mounting a GVolume instance is an asynchronous operation. For more information about asynchronous operations, see GAsyncReady and GSimpleAsyncReady. To mount a GVolume, first call g_volume_mount() with (at least) the GVolume instance, optionally a GMountOperation object and a GAsyncReadyCallback.

Typically, one will only want to pass NULL for the GMountOperation if automounting all volumes when a desktop session starts since it's not desirable to put up a lot of dialogs asking for credentials.

The callback will be fired when the operation has resolved (either with success or failure), and a GAsyncReady structure will be passed to the callback. That callback should then call g_volume_mount_finish() with the GVolume instance and the GAsyncReady data to see if the operation was completed successfully. If an error is present when g_volume_mount_finish() is called, then it will be filled with any error information.

It is sometimes necessary to directly access the underlying operating system object behind a volume (e.g. for passing a volume to an application via the commandline). For this purpose, GIO allows to obtain an 'identifier' for the volume. There can be different kinds of identifiers, such as Hal UDIs, filesystem labels, traditional Unix devices (e.g. /dev/sda2), uuids. GIO uses predefind strings as names for the different kinds of identifiers: G_VOLUME_IDENTIFIER_KIND_HAL_UDI, G_VOLUME_IDENTIFIER_KIND_LABEL, etc. Use g_volume_get_identifier() to obtain an identifier for a volume.

Note that G_VOLUME_IDENTIFIER_KIND_HAL_UDI will only be available when the gvfs hal volume monitor is in use. Other volume monitors will generally be able to provide the G_VOLUME_IDENTIFIER_KIND_UNIX_DEVICE identifier, which can be used to obtain a hal device by means of libhal_manger_find_device_string_match().

Details

GVolume

typedef struct _GVolume GVolume;

Opaque mountable volume object.

GVolumeIface

typedef struct {
  GTypeInterface g_iface;

  /* signals */

  void        (* changed)               (GVolume             *volume);
  void        (* removed)               (GVolume             *volume);

  /* Virtual Table */

  char      * (* get_name)              (GVolume             *volume);
  GIcon     * (* get_icon)              (GVolume             *volume);
  char      * (* get_uuid)              (GVolume             *volume);
  GDrive    * (* get_drive)             (GVolume             *volume);
  GMount    * (* get_mount)             (GVolume             *volume);
  gboolean    (* can_mount)             (GVolume             *volume);
  gboolean    (* can_eject)             (GVolume             *volume);
  void        (* mount_fn)              (GVolume             *volume,
                                         GMountMountFlags     flags,
                                         GMountOperation     *mount_operation,
                                         GCancellable        *cancellable,
                                         GAsyncReadyCallback  callback,
                                         gpointer             user_data);
  gboolean    (* mount_finish)          (GVolume             *volume,
                                         GAsyncResult        *result,
                                         GError             **error);
  void        (* eject)                 (GVolume             *volume,
                                         GMountUnmountFlags   flags,
                                         GCancellable        *cancellable,
                                         GAsyncReadyCallback  callback,
                                         gpointer             user_data);
  gboolean    (* eject_finish)          (GVolume             *volume,
                                         GAsyncResult        *result,
                                         GError             **error);

  char      * (* get_identifier)        (GVolume             *volume,
                                         const char          *kind);
  char     ** (* enumerate_identifiers) (GVolume             *volume);

  gboolean    (* should_automount)      (GVolume             *volume);

  GFile     * (* get_activation_root)   (GVolume             *volume);
} GVolumeIface;

Interface for implementing operations for mountable volumes.

GTypeInterface g_iface;

 The parent interface.

changed ()

 Changed signal that is emitted when the volume's state has changed.

removed ()

 The removed signal that is emitted when the GVolume have been removed. If the recipient is holding references to the object they should release them so the object can be finalized.

get_name ()

 Gets a string containing the name of the GVolume.

get_icon ()

 Gets a GIcon for the GVolume.

get_uuid ()

 Gets the UUID for the GVolume. 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.

get_drive ()

 Gets a GDrive the volume is located on. Returns NULL if the GVolume is not associated with a GDrive.

get_mount ()

 Gets a GMount representing the mounted volume. Returns NULL if the GVolume is not mounted.

can_mount ()

 Returns TRUE if the GVolume can be mounted.

can_eject ()

 Checks if a GVolume can be ejected.

mount_fn ()

 Mounts a given GVolume. GVolume implementations must emit the "aborted" signal before completing a mount operation that is aborted while awaiting input from the user through a GMountOperation instance.

mount_finish ()

 Finishes a mount operation.

eject ()

 Ejects a given GVolume.

eject_finish ()

 Finishes an eject operation.

get_identifier ()

 Returns the identifier of the given kind, or NULL if the GVolume doesn't have one.

enumerate_identifiers ()

 Returns an array strings listing the kinds of identifiers which the GVolume has.

should_automount ()

 Returns TRUE if the GVolume should be automatically mounted.

get_activation_root ()

 Returns the activation root for the GVolume if it is known in advance or NULL if it is not known.

g_volume_get_name ()

char *              g_volume_get_name                   (GVolume *volume);

Gets the name of volume.

volume :

 a GVolume.

Returns :

 the name for the given volume. The returned string should be freed with g_free() when no longer needed.

g_volume_get_uuid ()

char *              g_volume_get_uuid                   (GVolume *volume);

Gets the UUID for the volume. The reference is typically based on the file system UUID for the volume in question and should be considered an opaque string. Returns NULL if there is no UUID available.

volume :

 a GVolume.

Returns :

 the UUID for volume or NULL if no UUID can be computed. The returned string should be freed with g_free() when no longer needed.

g_volume_get_icon ()

GIcon *             g_volume_get_icon                   (GVolume *volume);

Gets the icon for volume.

volume :

 a GVolume.

Returns :

 a GIcon. The returned object should be unreffed with g_object_unref() when no longer needed.

g_volume_get_drive ()

GDrive *            g_volume_get_drive                  (GVolume *volume);

Gets the drive for the volume.

volume :

 a GVolume.

Returns :

 a GDrive or NULL if volume is not associated with a drive. The returned object should be unreffed with g_object_unref() when no longer needed.

g_volume_get_mount ()

GMount *            g_volume_get_mount                  (GVolume *volume);

Gets the mount for the volume.

volume :

 a GVolume.

Returns :

 a GMount or NULL if volume isn't mounted. The returned object should be unreffed with g_object_unref() when no longer needed.

g_volume_can_mount ()

gboolean            g_volume_can_mount                  (GVolume *volume);

Checks if a volume can be mounted.

volume :

 a GVolume.

Returns :

 TRUE if the volume can be mounted. FALSE otherwise.

g_volume_should_automount ()

gboolean            g_volume_should_automount           (GVolume *volume);

Returns whether the volume should be automatically mounted.

volume :

 a GVolume

Returns :

 TRUE if the volume should be automatically mounted.

g_volume_get_activation_root ()

GFile *             g_volume_get_activation_root        (GVolume *volume);

Gets the activation root for a GVolume if it is known ahead of mount time. Returns NULL otherwise. If not NULL and if volume is mounted, then the result of g_mount_get_root() on the GMount object obtained from g_volume_get_mount() will always either be equal or a prefix of what this function returns. In other words, in code 

  GMount *mount;
  GFile *mount_root
  GFile *volume_activation_root;

  mount = g_volume_get_mount (volume); /* mounted, so never NULL */
  mount_root = g_mount_get_root (mount);
  volume_activation_root = g_volume_get_activation_root(volume); /* assume not NULL */

then the expression 

  (g_file_has_prefix (volume_activation_root, mount_root) ||
      g_file_equal (volume_activation_root, mount_root))

will always be TRUE.

Activation roots are typically used in GVolumeMonitor implementations to find the underlying mount to shadow, see g_mount_is_shadowed() for more details.

volume :

 a GVolume

Returns :

 the activation root of volume or NULL. Use g_object_unref() to free.

Since 2.18

g_volume_mount ()

void                g_volume_mount                      (GVolume *volume,
                                                         GMountMountFlags flags,
                                                         GMountOperation *mount_operation,
                                                         GCancellable *cancellable,
                                                         GAsyncReadyCallback callback,
                                                         gpointer user_data);

Mounts a volume. This is an asynchronous operation, and is finished by calling g_volume_mount_finish() with the volume and GAsyncResult returned in the callback.

volume :

 a GVolume.

flags :

 flags affecting the operation

mount_operation :

 a GMountOperation or NULL to avoid user interaction.

cancellable :

 optional GCancellable object, NULL to ignore.

callback :

 a GAsyncReadyCallback, or NULL.

user_data :

 user data that gets passed to callback

g_volume_mount_finish ()

gboolean            g_volume_mount_finish               (GVolume *volume,
                                                         GAsyncResult *result,
                                                         GError **error);

Finishes mounting a volume. If any errors occured during the operation, error will be set to contain the errors and FALSE will be returned.

If the mount operation succeeded, g_volume_get_mount() on volume is guaranteed to return the mount right after calling this function; there's no need to listen for the 'mount-added' signal on GVolumeMonitor.

volume :

 a GVolume

result :

 a GAsyncResult

error :

 a GError location to store an error, or NULL to ignore

Returns :

 TRUE, FALSE if operation failed.

g_volume_can_eject ()

gboolean            g_volume_can_eject                  (GVolume *volume);

Checks if a volume can be ejected.

volume :

 a GVolume.

Returns :

 TRUE if the volume can be ejected. FALSE otherwise.

g_volume_eject ()

void                g_volume_eject                      (GVolume *volume,
                                                         GMountUnmountFlags flags,
                                                         GCancellable *cancellable,
                                                         GAsyncReadyCallback callback,
                                                         gpointer user_data);

Ejects a volume. This is an asynchronous operation, and is finished by calling g_volume_eject_finish() with the volume and GAsyncResult returned in the callback.

volume :

 a GVolume.

flags :

 flags affecting the unmount if required for eject

cancellable :

 optional GCancellable object, NULL to ignore.

callback :

 a GAsyncReadyCallback, or NULL.

user_data :

 user data that gets passed to callback

g_volume_eject_finish ()

gboolean            g_volume_eject_finish               (GVolume *volume,
                                                         GAsyncResult *result,
                                                         GError **error);

Finishes ejecting a volume. If any errors occured during the operation, error will be set to contain the errors and FALSE will be returned.

volume :

 pointer to a GVolume.

result :

 a GAsyncResult.

error :

 a GError location to store an error, or NULL to ignore

Returns :

 TRUE, FALSE if operation failed.

G_VOLUME_IDENTIFIER_KIND_HAL_UDI

#define G_VOLUME_IDENTIFIER_KIND_HAL_UDI "hal-udi"

The string used to obtain a Hal UDI with g_volume_get_identifier().

G_VOLUME_IDENTIFIER_KIND_LABEL

#define G_VOLUME_IDENTIFIER_KIND_LABEL "label"

The string used to obtain a filesystem label with g_volume_get_identifier().

G_VOLUME_IDENTIFIER_KIND_NFS_MOUNT

#define G_VOLUME_IDENTIFIER_KIND_NFS_MOUNT "nfs-mount"

The string used to obtain a NFS mount with g_volume_get_identifier().

G_VOLUME_IDENTIFIER_KIND_UNIX_DEVICE

#define G_VOLUME_IDENTIFIER_KIND_UNIX_DEVICE "unix-device"

The string used to obtain a Unix device path with g_volume_get_identifier().

G_VOLUME_IDENTIFIER_KIND_UUID

#define G_VOLUME_IDENTIFIER_KIND_UUID "uuid"

The string used to obtain a UUID with g_volume_get_identifier().

g_volume_enumerate_identifiers ()

char **             g_volume_enumerate_identifiers      (GVolume *volume);

Gets the kinds of identifiers that volume has. Use g_volume_get_identifer() to obtain the identifiers themselves.

volume :

 a GVolume

Returns :

 a NULL-terminated array of strings containing kinds of identifiers. Use g_strfreev() to free.

g_volume_get_identifier ()

char *              g_volume_get_identifier             (GVolume *volume,
                                                         const char *kind);

Gets the identifier of the given kind for volume. See the introduction for more information about volume identifiers.

volume :

 a GVolume

kind :

 the kind of identifier to return

Returns :

 a newly allocated string containing the requested identfier, or NULL if the GVolume doesn't have this kind of identifier

Signal Details

The "changed" signal

void                user_function                      (GVolume *arg0,
                                                        gpointer user_data)      : Run Last

Emitted when the volume has been changed.

user_data :

 user data set when the signal handler was connected.

The "removed" signal

void                user_function                      (GVolume *arg0,
                                                        gpointer user_data)      : Run Last

This signal is emitted when the GVolume have been removed. If the recipient is holding references to the object they should release them so the object can be finalized.

user_data :

 user data set when the signal handler was connected.
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