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Recipe 5.2 Running X Programs as root
5.2.1 Problem
While logged in as a normal
user, you need to run an X window application as root. You get this
error message:
** WARNING ** cannot open display
5.2.2 Solution
Create a shell script called, say, xsu:
#!/bin/sh
su - -c "exec env DISPLAY='$DISPLAY' XAUTHORITY='${XAUTHORITY-$HOME/.Xauthority}' "'"$SHELL"'" -c '$*'"
and run it with the desired command as its argument list:
# xsu ...command line...
5.2.3 Discussion
The problem is that root's
.Xauthority file does not have the proper
authorization credentials to access your X display.This script invokes a login shell [Recipe 5.1] and
the env program sets the environment
variables DISPLAY
and XAUTHORITY.
The values are set to be the same as the invoking
user's. Otherwise they would be set to
root's values, but root doesn't own
the display.So in this solution, XAUTHORITY remains
~user/.Xauthority instead of changing to
~root/.Xauthority. Since root can read any
user's .Xauthority file,
including this one, it works.This trick will not work if the user's home
directory is NFS-mounted without remote root access.
5.2.4 See Also
env(1), su(1), xauth(1).
