On 2019-10-29 14:32:39 +0900, John Crawley wrote: > A (bash) script wants to put up a GUI (yad) if it can, or otherwise try to > interact with the user on the terminal. > > Previously I was using loginctl: > loginctl show-session -p Type $XDG_SESSION_ID > and looking for 'Type=x11' or 'Type=wayland' > > However, if a user logs in on a tty and then runs 'startx' (I don't know if > Wayland has an equivalent) then the above command returns 'Type=tty' even > when X is running. > ($XDG_SESSION_TYPE gives the same results.)
One also gets Type=tty after SSH with X forwarding (ssh -X). > I've replaced the test with > [[ -n $DISPLAY || -n $WAYLAND_DISPLAY ]] && <use GUI> > but environment variables are a bit fragile and I was wondering if there > might be a better way. Actually they seem better as you can switch the X11 display (or disable it) by changing the value of $DISPLAY, and the GUI will probably honor this choice. -- Vincent Lefèvre <vinc...@vinc17.net> - Web: <https://www.vinc17.net/> 100% accessible validated (X)HTML - Blog: <https://www.vinc17.net/blog/> Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)
