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Full Discussion: DISPLAY=local_host:0.0 ; export DISPLAY
Top Forums UNIX for Advanced & Expert Users DISPLAY=local_host:0.0 ; export DISPLAY Post 302480229 by purdym on Tuesday 14th of December 2010 09:33:18 AM
Old 12-14-2010
When you log in, your display information is set. When you su, that information gets lost. It is possible though to make this work.

Here is the script I use. You will have to modify it. But hopefully you can understand what needs to be done:


Code:
#!/usr/bin/ksh93
#
# Name:
#
# Purpose:
#
# Type:
#
# Date:
#
# Required Parameters:
# -------------------------------------------------------------------------
# None.
#
# Optional Parameters:
# -------------------------------------------------------------------------
# None.
#
# Change History:
#
# Date          Name            Comments
# _________________________________________________________________________
# 30 jan 2004   purdym          changed
#                                       xauth extract ~/.ssh.display $DIS_HOST:$DIS_NUM
#                               to
#                                       xauth extract ~/.ssh.display :$DIS_NUM
#
#                               changed all /home/ and ~ to /u/$USER
#
# 8 jun 2006    purdym          updated to ksh93
#                                       xauth extract ~/.ssh.display $DIS_HOST:$DIS_NUM
#                                       KEY=`xauth -i list $DISPLAY 2>/dev/null`
#
# 14 jun 2006   purdym          added:
#                                       DIS_HOST=""
#                                       DIS_NUM=0
#
#
#
# 18 jul 2006   purdym          changed:
#                                       xauth -bi merge /u/${USER}/.ssh.display
#                                       xauth extract /u/$USER/.ssh.display :$DIS_NUM
#                               to:
#                                       xauth -bi merge ${HOME}/.ssh.display
#                                       xauth extract ${HOME}/.ssh.display :$DIS_NUM
#
#
#
# 19 oct 2010   purdym          removed:
#
#
#     WARNING:
#
#      It looks like you are using SSH.
#      This is a good thing, but your XWindows may not
#      work properly, especially if you switch user to root.
#      Not only do have to set the display, but there is key to unlock the display.
#      Please verify that your display is set to the hostname
#      or localhost and the display number is greater than or equal to 2.
#      Your display host is: $DIS_HOST
#      Your display number is: $DIS_NUM
#      Your KEY is: $KEY
#      Your key file is: $KEY_FILE
#      Your command file is: $COMMAND_FILE
#
#
#
#
#
#

###################################################################################
# Variables
###################################################################################
PROGRAM_NAME=$0
set_variables

KEY_FILE=/tmp/.${0##*/}.$USER.display_key.$$
COMMAND_FILE=/tmp/.${0##*/}.$USER.setup_display.$$

HOSTNAME=$(hostname)
DIS_HOST=""
integer DIS_NUM=0

RETCODE1=$?; if (( $RETCODE != 0 )); then RETCODE=$RETCODE1; fi

###################################################################################
# Main Line Here
###################################################################################
print "\nChecking for SSH connection....\c"
DIS_HOST=`print $DISPLAY | cut -d ":" -f1`
DIS_NUM=`print $DISPLAY | cut -d ":" -f2`

(( $DEBUG == $TRUE )) && print "DEBUG: DIS_HOS: $DIS_HOST"
(( $DEBUG == $TRUE )) && print "DEBUG: DIS_NUM: $DIS_NUM"

if (( DIS_NUM > 0 ))
then
   alias ls='/usr/local/bin/lsc --color=auto'
   xauth extract $KEY_FILE :$DIS_NUM
   KEY=`xauth -i list $HOSTNAME/unix:$DIS_NUM 2>/dev/null | awk '{print $3}'`
   print "yes!"                              # green on and off

   cat <<EOF
    Examples:
     In general:
      Get the key, then re-export your display:
      xauth -bi merge $KEY_FILE
      DISPLAY=$DISPLAY; export DISPLAY

                    -=OR=-

      you can run this script: $COMMAND_FILE

     As Root:
      . $COMMAND_FILE

     As Sybase:
      If you want to use the sybase account,
      you must change the permissions on the key file and run the command file. Run:

      su - root

      chmod g+r $KEY_FILE
      chmod g+rx $COMMAND_FILE
      su - sybase
      . $COMMAND_FILE

EOF

###################################################################################
# create a script!
###################################################################################
cat <<EOF >$COMMAND_FILE
#!/usr/bin/ksh
xauth -bi merge $KEY_FILE
DISPLAY=$DISPLAY
export DISPLAY
EOF

   chmod 500 $COMMAND_FILE

else
   print "none found. \n If this is in error, then X11 tunnelling is not configured."

fi

###################################################################################
# exit
###################################################################################
# do not exit this script

set_varaibles is function I wrote.
Notice the xauth comamnds.
In your own .profile, you must run the above script.

ie:

Code:
/etc/profile.ssh.check

When I log in, I see:

Code:
Checking for SSH connection....yes!
    Examples:
     In general:
      Get the key, then re-export your display:
      xauth -bi merge /tmp/.profile.ssh.check.AIX.purdym.display_key.905454
      DISPLAY=localhost:15.0; export DISPLAY

                    -=OR=-

      you can run this script: /tmp/.profile.ssh.check.AIX.purdym.setup_display.905454

     As Root:
      . /tmp/.profile.ssh.check.AIX.purdym.setup_display.905454

     As Sybase:
      If you want to use the sybase account,
      you must change the permissions on the key file and run the command file. Run:

      su - root

      chmod g+r /tmp/.profile.ssh.check.AIX.purdym.display_key.905454
      chmod g+rx /tmp/.profile.ssh.check.AIX.purdym.setup_display.905454
      su - sybase
      . /tmp/.profile.ssh.check.AIX.purdym.setup_display.905454

ms:/u/purdym>

Notice how you have to log in, su to root, change the perms on your key file, su to the next user, then source the key file.

Here is a full example:
Code:
Checking for SSH connection....yes!
    Examples:
     In general:
      Get the key, then re-export your display:
      xauth -bi merge /tmp/.profile.ssh.check.AIX.purdym.display_key.704600
      DISPLAY=localhost:16.0; export DISPLAY

                    -=OR=-

      you can run this script: /tmp/.profile.ssh.check.AIX.purdym.setup_display.704600

     As Root:
      . /tmp/.profile.ssh.check.AIX.purdym.setup_display.704600

     As Sybase:
      If you want to use the sybase account,
      you must change the permissions on the key file and run the command file. Run:

      su - root

      chmod g+r /tmp/.profile.ssh.check.AIX.purdym.display_key.704600
      chmod g+rx /tmp/.profile.ssh.check.AIX.purdym.setup_display.704600
      su - sybase
      . /tmp/.profile.ssh.check.AIX.purdym.setup_display.704600

ms:/u/purdym>
ms:/u/purdym>echo $DISPLAY
localhost:16.0

Now su to root:

ms:/u/purdym>su -
root's Password:

KeyChain 1.0
 * Found existing ssh-agent at PID 266338

Would you like to set your term to colour xterm (Y/n)?:


Looking for a TGT...ok.
root@ms:/>echo $DISPLAY

# notice root has no display
root@ms:/>. /tmp/.profile.ssh.check.AIX.purdym.setup_display.704600
root@ms:/>echo $DISPLAY
localhost:16.0

# now root has my display
root@ms:/>chmod g+r /tmp/.profile.ssh.check.AIX.purdym.display_key.704600
root@ms:/>chmod g+rx /tmp/.profile.ssh.check.AIX.purdym.setup_display.704600

# su to sybase
root@ms:/>su - sybase
sybase@ms:/home/sybase>echo $DISPLAY

# notice Sybase has no display
sybase@ms:/home/sybase>. /tmp/.profile.ssh.check.AIX.purdym.setup_display.704600
1356-364 xauth:  creating new authority file /home/sybase/.Xauthority
sybase@ms:/home/sybase>echo $DISPLAY
localhost:16.0
sybase@ms:/home/sybase>
# now sybase has my display

 

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