Cross Reference: /osnet-11/usr/src/grub/grub_cfg_net

#
# Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
#

#
# This is the GRUB2 microconfig file for network booting.  Its purpose is to
# locate and source the per-client grub.cfg file, which can be found on the
# TFTP server.
# The image that this file is built into must set its $prefix to a directory
# whose last component is the GRUB2 platform name of the current system.
# For example, on BIOS systems, $prefix should be ".../i386-pc".  This is
# essential for the Solaris network boot GRUB2 configuration file, because
# that's what it looks for when trying to determine the current platform.
#
# This script should be built into a memdisk image -- it should NOT be
# passed to grub-mkimage -c, because this script uses advanced scripting
# functionality that's only part of the GRUB2 `normal' module.
#
# By the time we get here, $root is set to "(tftp,<IP>)" and $prefix is
# a platform-specific GRUB2 device path.
#
# IMPORTANT: The tests for existence of configfiles here MUST be done with
# the -s test -- that's the only test that tries a file open and not a
# directory traversal, which tftp does not support.
#

echo Oracle Solaris Network Boot
echo -n Please wait while the network boot configuration file is located.
if keystatus -s; then
 set debug=true
 echo
 echo Shift key pressed -- enabling network config file debug
else
 sleep 1
 if read -dn debug; then
   if regexp "[Dd][Dd]*" "$debug"; then
     echo
     echo "'d' key pressed - enabling network config file debug"
     set debug=true
   else
     unset debug
   fi
 fi
fi

if [ -n "$debug" ]; then
 echo "<BEGIN GRUB2 ENVIRONMENT>"
 set
 echo "<END OF GRUB2 ENVIRONMENT>"
 echo Searching for config file
fi

if [ -n "$net_efinet0_boot_file" ]; then
  # Booting via UEFI
  set net_bootfile="$net_efinet0_boot_file"
  set net_mac="$net_efinet0_mac"
elif [ -n "$net_pxe_boot_file" ]; then
  # Booting via BIOS/PXE
  set net_bootfile="$net_pxe_boot_file"
  set net_mac="$net_pxe_mac"
elif [ -n "$debug" ]; then
  echo Neither net_efinet0_boot_file nor net_pxe_boot_file are set.
  echo Config file search will only include one location.
fi


# check for grub.cfg.01<MAC>
if [ ! -z $net_mac ]; then
  tr -U -s mac $net_mac
  regexp ([^:]+):([^:]+):([^:]+):([^:]+):([^:]+):([^:]+) $mac -s 1:a -s 2:b -s 3:c -s 4:d -s 5:e -s 6:f
  set mac=$a$b$c$d$e$f
  set clientcfgfile=grub.cfg.01$mac
  if [ -n "$debug" ]; then
    echo looking for $clientcfgfile
  else
    echo -n .
  fi
  if [ -s $clientcfgfile ]; then
    if [ -n "$debug" ]; then
      echo Found.  Press ENTER to continue.
      read discard
    else
      echo -n .
    fi
    configfile $clientcfgfile
    found=1
  fi
fi

# If there is a directory component of the boot file,
# march up the directory hierarchy starting there
# looking for the grub.cfg[.<clientid>]

if [ -z "$found" -a ! -z $net_bootfile ]; then

 if regexp ".*/.*" $net_bootfile ; then
    regexp "(.*)/" $net_bootfile -s 1:path
    while [ -n "$path" ]; do
      if [ -n "$clientcfgfile" ]; then
        if [ -n "$debug" ]; then
          echo looking for "${path}/$clientcfgfile"
        else
          echo -n .
        fi
        if [ -s "${path}/$clientcfgfile" ]; then
          if [ -n "$debug" ]; then
            echo Found.  Press ENTER to continue.
            read discard
          else
            echo -n .
          fi
          configfile "${path}/$clientcfgfile"
          found=1
        fi
      fi
      if [ -n "$debug" ]; then
        echo looking for ${path}/grub.cfg
      else
        echo -n .
      fi
      if [ -s "${path}/grub.cfg" ]; then
        if [ -n "$debug" ]; then
          echo Found.  Press ENTER to continue.
          read discard
        else
          echo -n .
        fi
        configfile "${path}/grub.cfg"
        found=1
      fi
      # go to the next path component:
      if ! regexp "(.*)/" $path -s 1:path; then
        break
      fi
   done
 fi

# Check for grub.cfg.<BootFile>
  # For BIOS PXE:
  regexp "pxegrub2\.(.*)" $net_bootfile -s 1:suffix
  if [ -z $suffix ]; then
    # For UEFI64 network boot application:
    regexp "grub2netx64\.efi\.(.*)" $net_bootfile -s 1:suffix
    if [ -z $suffix ]; then
      set suffix=$net_bootfile
    fi
  fi
  set cfgfile=grub.cfg.$suffix
  if [ -n "$debug" ]; then
    echo looking for $cfgfile
  else
    echo -n .
  fi
  if [ -s $cfgfile ]; then
    if [ -n "$debug" ]; then
      echo Found.  Press ENTER to continue.
      read discard
    else
      echo -n .
    fi
    configfile $cfgfile
    found=1
  fi
fi

if [ -z "$found" ]; then
  # Check for grub.cfg
  set cfgfile=boot/grub/grub.cfg
  if [ -n "$debug" ]; then
    echo Final attempt: looking for $cfgfile
  else
    echo -n .
  fi
  if [ -s $cfgfile ]; then
    if [ -n "$debug" ]; then
      echo Found.  Press ENTER to continue.
      read discard
    else
      echo -n .
    fi
    configfile $cfgfile
    found=1
  fi
fi

if [ -z "$found" ]; then
 echo
 echo No GRUB2 network configuration file could be located on the TFTP server!
 echo
 echo "Press 'r'<ENTER> to reboot or press <ENTER> to enter GRUB"
 read input
 if [ "$input" = "r" -o "$input" = "R" ]; then
   echo Rebooting...
   reboot
 fi
fi