Zenity does not accept DISPLAY=:0 anymore

[Redsandro]

I have a script that runs from udev when I plug in my external drive. It always worked. But after upgrading from Ubuntu 12.10 to 13.10, it doesn't work anymore.

The script still runs, but none of the commands that require the display work. I figured that out by quitting the udev daemon and manually run udevd -debug (more below).

This script used to work in Ubuntu 12.10:

export DISPLAY=:0
UUID=$1
DEV=$2

notify-send -t 700 "mounting $DEV ($UUID)"
gnome-terminal -t "Backing up home..." -x rsync long line of data
zenity --warning --text="Done."

But not anymore in 13.10. So I gradually added stuff and now it looks like this:

export DISPLAY=:0.0

xhost +local:
xhost +si:localuser:root
xhost +

DISPLAY=:0.0
export DISPLAY=:0.0
UUID=$1
DEV=$2

notify-send -t 700 "mounting $DEV ($UUID)"
gnome-terminal -t "Backing up home..." -x rsync long line of data
zenity --warning --text="Done." --display=:0.0

But it still doesn't work. udev -debug shows this:

'(err) 'No protocol specified'
'(err) ''
'(err) '** (gnome-terminal:24171): WARNING **: Could not open X display'
'(err) 'No protocol specified'
'(err) 'Failed to parse arguments: Cannot open display: '
'(err) 'No protocol specified'
'(err) ''
'(err) '** (zenity:24173): WARNING **: Could not open X display'
'(err) 'No protocol specified'
'(err) ''
'(err) '(zenity:24173): Gtk-WARNING **: cannot open display: :0.0'
'(err) 'No protocol specified'

Note that any bash logic works, echoing test vars to >>/tmp/test.log works. It's just accessing the display that doesn't work anymore.

This is driving me crazy. Thoughts, anyone?