[plasmashell] [Bug 523719] Show power action inhibition reason instead of failing silently

https://bugs.kde.org/show_bug.cgi?id=523719

--- Comment #2 from Tobias G. <[email protected]> ---
(In reply to Nate Graham from comment #1)
> What kind of inhibition makes the actual shut down/restart/etc. buttons not
> work? What is setting these?
> 
> > I used the systemctl command directly to check and it reported that something is inhibiting the action.
> What command did you run? And what did it say, exactly? Can you provide some
> details?

Hey, sure :)

In my case, zypper is setting it, preventing sleep, shutdown, ...:

sudo systemd-inhibit --list
WHO            UID  USER PID   COMM            WHAT                            
                                          WHY                                  
                     MODE 
ModemManager   0    root 1557  ModemManager    sleep                           
                                          ModemManager needs to reset devices  
                     delay
NetworkManager 0    root 1350  NetworkManager  sleep                           
                                          NetworkManager needs to turn off
networks                  delay
Realtime Kit   0    root 1954  rtkit-daemon    sleep                           
                                          Demote realtime scheduling and stop
canary.                delay
UPower         0    root 2010  upowerd         sleep                           
                                          Pause device polling                 
                     delay
zypp           0    root 67294 systemd-inhibit shutdown:sleep:idle             
                                          Zypp commit running.                 
                     block
PowerDevil     1000 deck 2569  org_kde_powerde
handle-power-key:handle-suspend-key:handle-hibernate-key:handle-lid-switch KDE
handles power events                                   block
compositor     1000 deck 2353  kwin_wayland    sleep                           
                                          Ensuring that the screen gets locked
before going to sleep delay
signal-desktop 1000 deck 2772  xdg-dbus-proxy  sleep                           
                                          Application cleanup before suspend   
                     delay

8 inhibitors listed.

I also see:
systemctl poweroff
Operation inhibited by "zypp" (PID 67294 "systemd-inhibit", user root), reason
is "Zypp commit running.".
Please retry operation after closing inhibitors and logging out other users.
'systemd-inhibit' can be used to list active inhibitors.
Alternatively, ignore inhibitors and users with 'systemctl poweroff -i'.

I just tried powering the system off with zypper running in the background and
all programs closed and plasmashell stopped, but the system then only showed a
black screen and didn't turn off (potentially zypper still running in the
background?).

This is not the scenario I already experienced a few times where really
_nothing_ happened, but I still think that this behaviour is not optimal. I
would have liked Plasma to show me that an application/process/service is
trying to prevent system shutdowns and tell me that a shutdown might not work
until they have finished.

Does this help? If you require additional details, please let me know :)

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