#! /bin/sh
# This script restores updated editable files to 
# their original state upon patch removal.  
#

MV=/usr/bin/mv
PKGCOND=/usr/bin/pkgcond

# If ROOTDIR = "/", we want to prevent the beginning of the absolute path 
# name from being assigned "// instead of "/" in the restore_file function. 

if [ "$ROOTDIR" = "/" ]; then
   rootdir=""
else
  rootdir=$ROOTDIR
fi

restore_file () {

efile_list="etc/system"

for efile in $efile_list ; do

     if [ -f $rootdir/$efile ] && [ -f $rootdir/$efile.$PatchNum ]
       then
            ${MV} $rootdir/$efile.$PatchNum $rootdir/$efile
       elif [ ! -f $rootdir/$efile.$PatchNum ] && [ ! -f $rootdir/$efile ]
         then
            # neither backup nor original are present. ignore
            return 
       elif [ ! -f $rootdir/$efile.$PatchNum ] && [ -f $rootdir/$efile ]
         then

       		cat << ENDCAT

          	Backup file $rootdir/$efile.$PatchNum 
          	appears to have been removed.  Unable to restore 
          	original $rootdir/$efile file.  

ENDCAT

#            return 
     fi

done
}

ExecuteALLCmds()
{
  restore_file
  return 0
}

determine_pkgcond () {

  if $PKGCOND  is_whole_root_nonglobal_zone > /dev/null 2>&1 ; then
      # Execute non-global whole root zone commands.
      # Should be same action as the default action.
      return 0
  fi

  if $PKGCOND  is_nonglobal_zone > /dev/null 2>&1 ; then
      # Execute non-global zone commands. Should be no action here
      return 0
  fi

  if $PKGCOND is_netinstall_image > /dev/null 2>&1 ; then
      # Execute commands applicable to patching the mini-root.
      # There are usually no actions to take here since your patching
      # the mini-root on an install server.
      return 0
  fi

  if $PKGCOND is_mounted_miniroot > /dev/null 2>&1 ; then
      # Execute commands specific to the mini-root
      ExecuteALLCmds
      return 0
  fi

  if $PKGCOND is_diskless_client > /dev/null 2>&1 ; then
      # Execute commands specific to diskless client
      return 0
  fi

  if $PKGCOND is_alternative_root > /dev/null 2>&1 ; then
      # Execute commands specific to an alternate root
      return 0
  fi

  if $PKGCOND is_global_zone > /dev/null 2>&1 ; then
      # In a global zone and system is mounted on /.
      # Execute all commands.
      return 0
  fi

}

# Main

ZONENAME=global

[ -x /sbin/zonename ] && ZONENAME=`/sbin/zonename`

if [ -x $PKGCOND ] ; then
  determine_pkgcond && exit 0 || exit 1
else
  CheckZones
  if [ "${GLOBAL_ZONE}" = "true" ]; then
       ExecuteALLCmds
  else
   LocalZones
  fi
fi

exit 0