Bug#775125: wayland idle time

[Russell Coker]

The package swayidle has code to detect idle time, the source has little in 
the way of comments and is difficult to understand.

swayidle -w timeout 5 'echo 5' timeout 10 'echo 10' resume 'echo resume' \ 
before-sleep 'echo before-sleep'

A command-line like the above will display messages on 5 seconds and 10 
seconds of idle time and display "resume" when there is keyboard or mouse 
input.  That could be changed to have kill -USR1 and kill -USR2 and use them 
as the signals for the system being idle or in-use.  If BOINC took those 
signals then the local user/sysadmin could script things to work with X11, 
terminal logins, etc.  The current code only works with X11 and even that code 
has issues.

If signals aren't considered a good way of doing it then there could be a flag 
file or some other method.

As an aside to run swayidle as root you need to set this environment variable 
WAYLAND_DISPLAY=../$REALUID/wayland-0 where REALUID is the UID of the user 
with the graphical login.

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