https://bugs.kde.org/show_bug.cgi?id=486024
Bug ID: 486024
Summary: callDBus fails for specific number types
Classification: Plasma
Product: kwin
Version: master
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: scripting
Assignee: kwin-bugs-n...@kde.org
Reporter: kmcwilliampub...@gmail.com
Target Milestone: ---
SUMMARY
Calling a method on a D-Bus object can fail if the method has arguments of a
specific number signature, such as uint32.
STEPS TO REPRODUCE
1. Monitor kwin script output:
```
journalctl -b -f | grep -i "kwin"
```
2. Open the KWin Scripting Console
3. Call the `Inhibit` method on `org.freedesktop.Notifications`, which works as
expected:
```javascript
callDBus(
"org.freedesktop.Notifications",
"/org/freedesktop/Notifications",
"org.freedesktop.Notifications",
"Inhibit",
"",
"",
{},
function (reply) {
console.info("Callback. Reply: " + reply);
}
);
```
4. Check the output of the journal, which should show the
message "Callback. Reply: $number" - I'll assume it was 1 for the sake of
this example. Do Not Disturb should have been enabled.
5. Call the method `UnInhibit` on `org.freedesktop.Notifications`, which
expects
a uint32 as argument:
```javascript
callDBus(
"org.freedesktop.Notifications",
"/org/freedesktop/Notifications",
"org.freedesktop.Notifications",
"UnInhibit",
1,
function (reply) {
console.info("UnInhibit callback. Reply: " + reply);
}
);
```
OBSERVED RESULT
KWin journal output shows it failed due to no method with the signature:
```
kwin_wayland[4962]: warning:kwin_scripting:unknown:0 - Received D-Bus message
is error: "No such method 'UnInhibit' in interface
'org.freedesktop.Notifications' at object path '/org/freedesktop/Notifications'
(signature 'i')"
```
The method `UnInhibit` expects a uint32 as argument, but callDBus is trying
with
an int `(signature 'i')`.
EXPECTED RESULT
The method `UnInhibit` should be called successfully, and Do Not Disturb should
be disabled.
SOFTWARE/OS VERSIONS
Operating System: Fedora Linux 40
KDE Plasma Version: 6.0.3
KDE Frameworks Version: 6.0.0
Qt Version: 6.6.2
Kernel Version: 6.8.7-300.fc40.x86_64 (64-bit)
Graphics Platform: Wayland
Processors: 16 × AMD Ryzen 7 3700X 8-Core Processor
Memory: 31.3 GiB of RAM
Graphics Processor: AMD Radeon RX 580 Series
Manufacturer: Micro-Star International Co., Ltd.
Product Name: MS-7C56
System Version: 2.0
ADDITIONAL INFORMATION
This is probably because `QJSValue::toVariant()` only converts to int or double
for numbers, and special handling is needed to check for other types:
https://invent.kde.org/plasma/kwin/-/blob/7949032411153ebf9d87b0e936b1bc288df12b38/src/scripting/scripting.cpp#L344
Interestingly, if `UnInhibit` is called without a callback, it fails silently.
The error from kwin about the type mismatch is only output if a callback is
provided.
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