No 'org.freedesktop.DBus.Error.PropertyWriteOnly' error

Submitted by nschoe

Assigned to D-Bus Maintainers

Link to original bug (#98722)

Description

DBus properties can have 3 different access mode:

• readonly
• read
• write

When trying to set a new value to a readonly property, we get the DBus error: org.freedesktop.DBus.Error.PropertyReadOnly, but there is no such equivalent for trying to read a write property.

Admittedly this should not happen too often as I read that the use of write-only properties is discouraged, but since it is explicitly supported, I think we should provide a proper error.