Volume Identifiers

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 predefined 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_manager_find_device_string_match().

g_volume_get_name ()

char *
g_volume_get_name (GVolume *volume);

Gets the name of volume .

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.

g_volume_get_icon ()

GIcon *
g_volume_get_icon (GVolume *volume);

Gets the icon for volume .

g_volume_get_symbolic_icon ()

GIcon *
g_volume_get_symbolic_icon (GVolume *volume);

Gets the symbolic icon for volume .

Since 2.34

g_volume_get_drive ()

GDrive *
g_volume_get_drive (GVolume *volume);

Gets the drive for the volume .

g_volume_get_mount ()

GMount *
g_volume_get_mount (GVolume *volume);

Gets the mount for the volume .

g_volume_can_mount ()

gboolean
g_volume_can_mount (GVolume *volume);

Checks if a volume can be mounted.

g_volume_should_automount ()

gboolean
g_volume_should_automount (GVolume *volume);

Returns whether 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

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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

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(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.

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 .

Virtual: mount_fn

g_volume_mount_finish ()

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

Finishes mounting a volume. If any errors occurred 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.

g_volume_can_eject ()

gboolean
g_volume_can_eject (GVolume *volume);

Checks if a volume can be ejected.

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 .

g_volume_eject_finish ()

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

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

g_volume_eject_with_operation ()

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

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

Since 2.22

g_volume_eject_with_operation_finish ()

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

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

Since 2.22

g_volume_enumerate_identifiers ()

char **
g_volume_enumerate_identifiers (GVolume *volume);

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

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.

g_volume_get_sort_key ()

const gchar *
g_volume_get_sort_key (GVolume *volume);

Gets the sort key for volume , if any.

Since 2.32

GVolume

typedef struct _GVolume GVolume;

Opaque mountable volume object.

struct GVolumeIface

struct GVolumeIface {
  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);

  void        (* eject_with_operation)      (GVolume             *volume,
                                             GMountUnmountFlags   flags,
                                             GMountOperation     *mount_operation,
                                             GCancellable        *cancellable,
                                             GAsyncReadyCallback  callback,
                                             gpointer             user_data);
  gboolean    (* eject_with_operation_finish) (GVolume           *volume,
                                             GAsyncResult        *result,
                                             GError             **error);

  const gchar * (* get_sort_key)        (GVolume             *volume);
  GIcon       * (* get_symbolic_icon)   (GVolume             *volume);
};

Interface for implementing operations for mountable volumes.

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_IDENTIFIER_KIND_CLASS

#define G_VOLUME_IDENTIFIER_KIND_CLASS "class"

The string used to obtain the volume class with g_volume_get_identifier().

Known volume classes include device and network. Other classes may be added in the future.

This is intended to be used by applications to classify GVolume instances into different sections - for example a file manager or file chooser can use this information to show network volumes under a "Network" heading and device volumes under a "Devices" heading.

The “changed” signal

void
user_function (GVolume *arg0,
               gpointer user_data)

Emitted when the volume has been changed.

Flags: Run Last

The “removed” signal

void
user_function (GVolume *arg0,
               gpointer user_data)

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.

Flags: Run Last