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Start tumbler from source with debugging enabled
Monitor tumbler DBus Signals
'Ready' signals: dbus-monitor “interface='org.freedesktop.thumbnails.Thumbnailer1',member='Ready'”
'Error signals: dbus-monitor “interface='org.freedesktop.thumbnails.Thumbnailer1',member='Error'”
'Finished' signals: dbus-monitor “interface='org.freedesktop.thumbnails.Thumbnailer1',member='Finished'”
All signal: dbus-monitor “interface='org.freedesktop.thumbnails.Thumbnailer1'”
Check some mandatory attributes of the thumbnail via identify -verbose <thumbnail.png>
Checksum:
The checksum used for the thumbnail name is build from the absolute
URI of the file to thumbnail. It can be generated like this:
Command:
echo -n file:///home/my/photos/me.png | md5sum
--> c6ee772d9e49320e97ec29a7eb5b1697.png