Mounts a file of type G_FILE_TYPE_MOUNTABLE.
mount_operation, you can request callbacks when, for instance, passwords are needed during authentication.
cancellable is not null, then the operation can be cancelled by triggering the cancellable
object from another thread. If the operation was cancelled, the error g_io_error_cancelled will be returned.
When the operation is finished,
callback will be called. You can then call mount_mountable.end
to get the result of the operation.
flags affecting the operation
a MountOperation, or null to avoid user interaction
optional Cancellable object, null to ignore
a TaskReadyCallback to call when the request is satisfied, or null
the data to pass to callback function