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kdesu - console output and password keeping

Hey all,

We've recently integrated kdesu into hotspot [1] to be able to record profile 
data as root. This is required to get access to some "advanced" performance 
counters and trace points, most notably the sched:sched_switch tracepoint 
required for off-CPU profiling.

Now, my colleague originally used kdesudo which doesn't seem to be alive (?) 
upstream. I've seen there's some bzr repo that the kubuntu people seem to use. 
But in KDE proper, only kdesu is available. So I used that instead but it has 
a severe limitation: I cannot show the command output _and_ enable password 

$ man kdesu
           Enable terminal output. This disables password keeping. This is 
largely for debugging purposes; if you want to run a console mode app, use the 
standard su instead.

I don't quite get why one would want to use standard su - we want to show a 
graphical dialog to the user and enable password keeping. Can someone explain 
this limitation? Is there some other alternative we could use? Essentially we 
run the following command right now, which shows what we need to do:

kdesu -u root -t --attach $winId -- \
    perf record -o $outputfile <...more args...> -- \
    runuser -u $non-root-user -- \
    $userapp $userargs
kdesu -u root -t --attach $winId --
    chown $non-root-user:$non-root-group $outputfile

This triggers two password prompts, which is unfortunate I think.


[1]: https://github.com/KDAB/hotspot
Milian Wolff