#!/bin/bash

###################################################################################
# Script.: find-what-x11-drivers-need-rebuilding                                  #
# Purpose: Test the X11 drivers to ensure that none need a rebuild following from #
#          an upgrade of X11                                                      #
# Author : Stuart Winter <mozes@slackware.com>                                    #
# Date...: 29th-Dec-2014                                                          #
# Version: v1.00                                                                  #
###################################################################################

# Strip all known package extensions,build number and architecture to return 
# the naked package name:
package_name() {
  echo $1 | sed -e 's?.*/??;s/\.t[bglx]z$//' -e 's?-[^-]*-[^-]*-[^-]*$??'
}

# Clean up:
rm -f /var/log/Xorg.0.log*

# Let X automatically try to configure itself with the drivers installed
# upon the running OS.  We'll parse the log file to see what happened:
X -configure > /dev/null 2>&1 

if [ ! -z "$( grep 'Failed to load module' /var/log/Xorg.0.log )" ]; then
   printf "The following drivers need a rebuild:\n\n"

   cd /var/log/packages || exit 1

   # Parse the log file looking for failures:
   grep "Failed to load module" /var/log/Xorg.0.log  | awk -F\" '{print $2}' | while read xdriver ; do

      # Find the Slackware package file name that corresponds to the X11 driver name:
      # (The trailing '/' allows pasting of the package name directly into the
      # 'indibuild' script for ARM)
      printf "\t $( package_name $( ls -1 *${xdriver}*-*[0-9] ) ) \\ \n\n"

      # Provide the error message from X11's log:
      printf "$( grep "UnloadModule: \"$xdriver\"" /var/log/Xorg.0.log -B1 | head -n1 )\n\n"
   done
 else
   echo "The X11 log suggests that all modules loaded successfully - none need rebuilding."
fi

#EOF