#!/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.
#
#

#
# Usage:
#
#  vyatta-grub-setup [ -u <livedir> ] [ -v <version> ]
#
# The -u and -v flags are mutually exclusive.
#


# 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 rootdelay=5"
else
	GRUB_OPTIONS="quiet rootdelay=5"
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"
usb_console="console=tty0 console=ttyUSB0,9600"

# 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
elif [ "`tty`" == "/dev/ttyUSB0" ]; then
      # Since user is running on usb console, make that the default.
      default_console=2
else
      # Since user is running on KVM console, make that the default
      default_console=0
fi

if eval "$UNION"; then
    GRUB_OPTIONS="boot=live quiet rootdelay=5 vyos-union=/boot/$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

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

(
    # 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_output --append serial"
    echo "terminal_input serial console"

    # EFI needs a few extra modules
    if [ -d /sys/firmware/efi ]; then
	echo -e "insmod efi_gop"
	echo -e "insmod efi_uga"
    fi

    if [ ${ROOT_PARTITION:0:2} = "md" ]; then
        if [ -d /sys/firmware/efi ]; then
	    uuid_root_disk=`/sbin/tune2fs -l /dev/${root_disk}3 | grep UUID | awk '{print $3}'`
        else
	    uuid_root_disk=`/sbin/tune2fs -l /dev/${root_disk}1 | grep UUID | awk '{print $3}'`
        fi
	uuid_root_md=`/sbin/tune2fs -l /dev/md${ROOT_PARTITION#md} | grep UUID | awk '{print $3}'`
	echo ""
	echo -e "insmod part_msdos"
	echo -e "insmod diskfilter"
	echo -e "insmod ext2"
	echo -e "insmod mdraid1x"
	echo -e "set root='mduuid/${uuid_root_disk}'"
	echo -e "search --no-floppy --fs-uuid --set=root ${uuid_root_md}"
    fi

    # create xen kernels if they exist
    XEN_OPTS='dom0_mem=512M xenheap_megabytes=128'
    if [ -n "$xen_kernel_version" ]; then
       for xversion in $xen_kernel_version; do
          echo
          echo
          echo -e "menuentry \"VyOS Xen linux$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 $union_xen_kernel_version; do
          echo
          echo
          echo -e "menuentry \"VyOS Xen linux$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 eval "$UNION"; then
	# UNION case
	if [ -e "$ROOTFSDIR/boot/$livedir/vmlinuz" -a \
	     -e "$ROOTFSDIR/boot/$livedir/initrd.img" ]; then
            echo
            echo -e "menuentry \"VyOS $version linux (KVM console)\" {"
            echo -e "\tlinux /boot/$livedir/vmlinuz $GRUB_OPTIONS $VGA_LOGO $vty_console"
            echo -e  "\tinitrd /boot/$livedir/initrd.img"
            echo -e "}"
            echo
            echo -e "menuentry \"VyOS $version linux (Serial console)\" {"
            echo -e "\tlinux /boot/$livedir/vmlinuz $GRUB_OPTIONS $serial_console"
            echo -e  "\tinitrd /boot/$livedir/initrd.img"
            echo -e "}"
            echo
            echo -e "menuentry \"VyOS $version linux (USB console)\" {"
            echo -e "\tlinux /boot/$livedir/vmlinuz $GRUB_OPTIONS $usb_console"
            echo -e  "\tinitrd /boot/$livedir/initrd.img"
            echo -e "}"

	elif [ -n "$union_kernel_versions" ]; then
	    for kversion in $union_kernel_versions; do
		echo
		echo -e "menuentry \"VyOS $version linux$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 \"VyOS $version linux$kversion (Serial console)\" {"
		echo -e "\tlinux /boot/$livedir/vmlinuz$kversion $GRUB_OPTIONS $serial_console"
		echo -e  "\tinitrd /boot/$livedir/initrd.img$kversion"
		echo -e "}"
		echo
		echo -e "menuentry \"VyOS $version linux$kversion (USB console)\" {"
		echo -e "\tlinux /boot/$livedir/vmlinuz$kversion $GRUB_OPTIONS $usb_console"
		echo -e  "\tinitrd /boot/$livedir/initrd.img$kversion"
		echo -e "}"
	    done
	fi
    else
	# Non-UNION case
	if [ -f "$ROOTFSDIR/boot/vmlinuz" ]; then
            # Set first system boot option.  Make KVM the default console in this one.
	    echo -e "menuentry \"VyOS $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 \"VyOS $version (Serial console)\" {"
	    echo -e "\tlinux /boot/vmlinuz $GRUB_OPTIONS $serial_console"
	    echo -e  "\tinitrd /boot/initrd.img"
	    echo -e "}"
	    echo
	    echo -e "menuentry \"VyOS $version (USB console)\" {"
	    echo -e "\tlinux /boot/vmlinuz $GRUB_OPTIONS $usb_console"
	    echo -e  "\tinitrd /boot/initrd.img"
	    echo -e "}"
	elif [ -n "$kernel_versions" ]; then
	    for kversion in $kernel_versions; do
		echo
		echo -e "menuentry \"VyOS $version linux$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 \"VyOS $version linux$kversion (Serial console)\" {"
		echo -e "\tlinux /boot/vmlinuz$kversion $GRUB_OPTIONS $serial_console"
		echo -e  "\tinitrd /boot/initrd.img$kversion"
		echo -e "}"
		echo
		echo -e "menuentry \"VyOS $version linux$kversion (USB console)\" {"
		echo -e "\tlinux /boot/vmlinuz$kversion $GRUB_OPTIONS $usb_console"
		echo -e  "\tinitrd /boot/initrd.img$kversion"
		echo -e "}"
	    done
	fi
    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 "}"

    echo
    echo -e "menuentry \"Lost password change $version (USB console)\" {"
    echo -e "\tlinux $reset_boot_path/vmlinuz $GRUB_OPTIONS $NOSELINUX $usb_console init=$pass_reset"
    echo -e "\tinitrd $reset_boot_path/initrd.img"
    echo -e "}"

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

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