#!/bin/sh
#
# Module: grup-setup
# 
# **** License ****
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# General Public License for more details.
#
# This code was originally developed by Vyatta, Inc.
# Portions created by Vyatta are Copyright (C) 2006, 2007 Vyatta, Inc.
# All Rights Reserved.
# 
# Author: Robert Bays
# Date: 2006
# Description:
# 
# **** End License ****
#
# Vyatta grub customization setup script.
#
#

# The OS version we are installing
version=""

UNION="false"
while getopts u:v: c
do
  case $c in
    u)       UNION=true;
             livedir=$OPTARG;
	     version=$livedir;;

    v)	     version=$OPTARG;;
  esac
done
shift `expr $OPTIND - 1`

ROOT_PARTITION="$1"
GRUB_OPTIONS="$2"
ROOTFSDIR="$3"

[ "$ROOT_PARTITION" ] || exit 1 

# Grub options
if [ "$GRUB_OPTIONS" ]
then
	GRUB_OPTIONS="$GRUB_OPTIONS quiet"
else
	GRUB_OPTIONS=quiet
fi

# Path to standalone root password reset script
pass_reset=/opt/vyatta/sbin/standalone_root_pw_reset

# Output to both console (last device is /dev/console)
vty_console="console=ttyS0,9600 console=tty0"
serial_console="console=tty0 console=ttyS0,9600"

# If vga_logo is set, enable use of the VGA monitor for displaying the
# logo during boot.  The "vga=" boot command specifies a VGA mode that
# is encoded as shown below.  We pick a value that is likely to work
# on most systems. (Disabled on Xen)
# See kernel Documentation/fb/vesafb.txt for resolution constants
#VGA_LOGO="vga=785"

# Disable SELinux when doing maintance operations
NOSELINUX="selinux=0"

# get list of kernels, except Xen
kernel_versions=$(ls $ROOTFSDIR/boot/vmlinuz-* 2> /dev/null | grep -v xen | awk -F/ '{ print $5 }' | sed 's/vmlinuz//g' | sort -r)

# get xen kernel info
xen_kernel_version=$(ls $ROOTFSDIR/boot/vmlinuz*-xen* 2> /dev/null | awk -F/ '{ print $5 }' | sed 's/vmlinuz//g' | sort -r)
xen_version=$(ls $ROOTFSDIR/boot/xen-*.gz 2> /dev/null | head -1 | awk -F/ '{ print $5 }' | sort -r)

# Figure out whether we are running on the serial or KVM console:
if [ "`tty`" == "/dev/ttyS0" ]; then
      # Since user is running on serial console, make that the default.
      default_console=1
else
      # Since user is running on KVM console, make that the default
      default_console=0
fi

if eval "$UNION"; then
    GRUB_OPTIONS="boot=live quiet vyatta-union=/boot/$livedir"
    union_xen_kernel_version=$(ls $ROOTFSDIR/boot/$livedir/vmlinuz*-xen* \
                                 2>/dev/null \
                               | awk -F/ '{ print $6 }' \
                               | sed 's/vmlinuz//g' | sort -r)
    union_xen_version=$(ls $ROOTFSDIR/boot/$livedir/xen-*.gz 2> /dev/null \
                        | head -1 | awk -F/ '{ print $6 }' | sort -r)
    union_kernel_versions=$(ls $ROOTFSDIR/boot/$livedir/vmlinuz-* \
                              2> /dev/null | grep -v xen \
                            | awk -F/ '{ print $6 }' | sed 's/vmlinuz//g' \
                            | sort -r)
else 
    # Read UUID off of filesystem and use it to tell GRUB where to mount drive
    # This allows device to move around and grub will still find it
    uuid=$(dumpe2fs -h /dev/${ROOT_PARTITION} 2>/dev/null | awk '/^Filesystem UUID/ {print $3}')
    if [ -z "$uuid" ]
    then
	# TODO: use /proc/mount if dumpe2fs fails
        echo "Unable to read filesystem UUID.  Exiting."
        exit 1
    else
        GRUB_OPTIONS="$GRUB_OPTIONS root=UUID=$uuid ro"
    fi
fi

if [ -n "$xen_kernel_version" ] || [ -n "$union_xen_kernel_version" ]; then
    # xen kernel exists. default to the first xen kernel.
    default_console=0
fi

# Check for diagnostic partition residing in first partition of drive 
# holding the root partition.

diag_drive_number=""

if [ ${ROOT_PARTITION:0:2} = "md" ]; then
    # Select the first disk in the RAID group to look for diag partition on
    root_disks=`echo /sys/block/$ROOT_PARTITION/slaves/*`
    root_disk=`echo ${root_disks} | awk '{ print $1 }'`
    root_disk=${root_disk##*/}
    root_disk=${root_disk:0:${#root_disk}-1}
else
    # Shave off the partition number to get the disk name
    root_disk=${ROOT_PARTITION:0:${#ROOT_PARTITION}-1}
fi

# If the root partition is not occupying the first partition, then we
# can look for a diag partition there.
if [ "$ROOT_PARTITION" != "${root_disk}1" ]; then
    first_part_fstype=`fdisk -l /dev/$root_disk | grep ^/dev/${root_disk}1 | awk '{ print $6 }'`

    if [ "$first_part_fstype" = "FAT16" -o "$first_part_fstype" = "Dell" ]; then
        # Translate the Linux drive letter (e.g. the "a" in "/dev/sda") into
        # a drive number that grub uses. i.e. "a" = 0, "b" = 1, etc.
	diag_drive_letter=${root_disk:2:1}
	diag_drive_number=`echo $diag_drive_letter | od -t u1 -N 1 | awk '{ print $2 }'`
	let diag_drive_number-=97
    fi
fi

(
    # create the grub.cfg file for grub
    # The "default=" line selects which boot option will be used by default.
    # Numbering starts at 0 for the first option.
    echo -e "# Generated by $0 at `date`"
    echo -e "set default=$default_console"
    echo "set timeout=5"
    # set serial console options
    echo -e "serial --unit=0 --speed=9600"
    echo "terminal serial"

    if [ ${ROOT_PARTITION:0:2} = "md" ]; then
	echo ""
	echo -e "insmod raid"
	echo -e "root ($ROOT_PARTITION)"
    fi

    echo ""
    echo "echo -n Press ESC to enter the Grub menu..."
    echo "if sleep --verbose --interruptible 5 ; then"
    echo -e "\tterminal console"
    echo -e "\techo -n Press the ESC key to enter the Grub menu..."
    echo -e "\tif sleep --verbose --interruptible 5 ; then"
    echo -e "\t\tterminal serial"
    ## don't set timeout here. causes boot problem on 64-bit
    # echo -e "\t\tset timeout=0"
    echo -e "\tfi"
    echo "fi"
    echo ""

    # create xen kernels if they exist
    XEN_OPTS='dom0_mem=512M xenheap_megabytes=128'
    if [ -n "$xen_kernel_version" ]; then
       for xversion in $xen_kernel_version; do
          echo
          echo
          echo -e "menuentry \"Vyatta Xen linux$xversion dom0\" {"
          echo -e "\tmultiboot /boot/$xen_version $XEN_OPTS"
          echo -e "\tmodule /boot/vmlinuz$xversion $GRUB_OPTIONS $vty_console"
          echo -e  "\tmodule /boot/initrd.img$xversion"
          echo -e "}"
       done
    fi

    if [ -n "$union_xen_kernel_version" ]; then
       for xversion in $union_xen_kernel_version; do
          echo
          echo
          echo -e "menuentry \"Vyatta Xen linux$xversion dom0\" {"
          echo -e "\tmultiboot /boot/$livedir/$union_xen_version $XEN_OPTS"
          echo -e "\tmodule /boot/$livedir/vmlinuz$xversion $GRUB_OPTIONS $vty_console"
          echo -e  "\tmodule /boot/$livedir/initrd.img$xversion"
          echo -e "}"
       done
    fi

    if [ -f "$ROOTFSDIR/boot/vmlinuz" ] && ! eval $UNION ; then
       # Set first system boot option.  Make KVM the default console in this one.
       echo -e "menuentry \"Vyatta $version (KVM console)\" {"
       echo -e "\tlinux /boot/vmlinuz $GRUB_OPTIONS $VGA_LOGO $vty_console"
       echo -e  "\tinitrd /boot/initrd.img"
       echo -e "}"
  
       # Set the second system boot option.  Make the serial port be the default
       # console in this one.
       echo
       echo -e "menuentry \"Vyatta $version (Serial console)\" {"
       echo -e "\tlinux /boot/vmlinuz $GRUB_OPTIONS $serial_console"
       echo -e  "\tinitrd /boot/initrd.img"
       echo -e "}"
    fi
  
    # create union kernels if they exist
    if [ -n "$union_kernel_versions" ]; then
       for kversion in $union_kernel_versions; do
          echo
          echo -e "menuentry \"Vyatta $version linux$kversion (KVM console)\" {"
          echo -e "\tlinux /boot/$livedir/vmlinuz$kversion $GRUB_OPTIONS $VGA_LOGO $vty_console"
          echo -e  "\tinitrd /boot/$livedir/initrd.img$kversion"
          echo -e "}"
          echo
          echo -e "menuentry \"Vyatta $version linux$kversion (Serial console)\" {"
          echo -e "\tlinux /boot/$livedir/vmlinuz$kversion $GRUB_OPTIONS $serial_console"
          echo -e  "\tinitrd /boot/$livedir/initrd.img$kversion"
          echo -e "}"
       done
    fi

    # create other kernels if they exist
    if [ -n "$kernel_versions" ]; then
       for kversion in $kernel_versions; do
          echo
          echo -e "menuentry \"Vyatta $version linux$kversion (KVM console)\" {"
          echo -e "\tlinux /boot/vmlinuz$kversion $GRUB_OPTIONS $VGA_LOGO $vty_console"
          echo -e  "\tinitrd /boot/initrd.img$kversion"
          echo -e "}"
          echo
          echo -e "menuentry \"Vyatta $version linux$kversion (Serial console)\" {"
          echo -e "\tlinux /boot/vmlinuz$kversion $GRUB_OPTIONS $serial_console"
          echo -e  "\tinitrd /boot/initrd.img$kversion"
          echo -e "}"
       done
    fi

    # Set options for root password reset.  Offer 
    # options for both serial and KVM console.
    reset_boot_path=/boot
    if eval "$UNION"; then
        reset_boot_path=/boot/$livedir
    fi
  
    echo
    echo -e "menuentry \"Lost password change $version (KVM console)\" {"
    echo -e "\tlinux $reset_boot_path/vmlinuz $GRUB_OPTIONS $NOSELINUX $vty_console init=$pass_reset"
    echo -e "\tinitrd $reset_boot_path/initrd.img"
    echo -e "}"
  
    echo
    echo -e "menuentry \"Lost password change $version (Serial console)\" {"
    echo -e "\tlinux $reset_boot_path/vmlinuz $GRUB_OPTIONS $NOSELINUX $serial_console init=$pass_reset"
    echo -e "\tinitrd $reset_boot_path/initrd.img"
    echo -e "}"

    if [ -n "$diag_drive_number" ]; then
	echo 
	echo -e "menuentry \"Diagnostics\" {"
	echo -e "\tchainloader (hd$diag_drive_number,1)+1"
	echo -e "}"
    fi
    

) >"$ROOTFSDIR"/boot/grub/grub.cfg

(   [ -s /boot/grub/menu.lst ] &&
	upgrade-from-grub-legacy &&
	rm -f /boot/grub/menu.lst*
) || true