sonic-buildimage/installer/default_platform.conf

#!/bin/sh


# Pick up console port and speed from install enviroment if not defined yet.
# Console port and speed setting in cmdline is like "console=ttyS0,9600n",
# so we can use pattern 'console=ttyS[0-9]+,[0-9]+' to match it.
# If failed to get the speed and ttyS from cmdline then set them to default: ttyS0 and 9600
if [ -z "$CONSOLE_PORT" ]; then
    console_ttys=$(cat /proc/cmdline | grep -Eo 'console=ttyS[0-9]+' | cut -d "=" -f2)
    if [ -z "$console_ttys" -o "$console_ttys" = "ttyS0" ]; then
        CONSOLE_PORT=0x3f8
        CONSOLE_DEV=0
    elif [ "$console_ttys" = "ttyS1" ]; then
        CONSOLE_PORT=0x2f8
        CONSOLE_DEV=1
    elif [ "$console_ttys" = "ttyS2" ]; then
        CONSOLE_PORT=0x3e8
        CONSOLE_DEV=2
    elif [ "$console_ttys" = "ttyS3" ]; then
        CONSOLE_PORT=0x2e8
        CONSOLE_DEV=3
    fi
fi

if [ -z "$CONSOLE_SPEED" ]; then
    speed=$(cat /proc/cmdline | grep -Eo 'console=ttyS[0-9]+,[0-9]+' | cut -d "," -f2)
    if [ -z "$speed" ]; then
        CONSOLE_SPEED=9600
    else
        CONSOLE_SPEED=$speed
    fi
fi

create_partition()
{

    # Install demo on same block device as ONIE
    if [ "$install_env" != "build" ]; then
        onie_dev=$(blkid | grep ONIE-BOOT | head -n 1 | awk '{print $1}' |  sed -e 's/:.*$//')
        blk_dev=$(echo $onie_dev | sed -e 's/[1-9][0-9]*$//' | sed -e 's/\([0-9]\)\(p\)/\1/')

        # check if we have an nvme device
        blk_suffix=
        echo $blk_dev | grep -q nvme0 && blk_suffix="p"

        # Note: ONIE has no mount setting for / with device node, so below will be empty string

    	cur_part=$(cat /proc/mounts | awk "{ if(\$2==\"/\") print \$1 }" | grep $blk_dev || true)

        [ -b "$blk_dev" ] || {
            echo "Error: Unable to determine block device of ONIE install"
            exit 1
        }
    fi

    # auto-detect whether BIOS or UEFI
    if [ -d "/sys/firmware/efi/efivars" ] ; then
        firmware="uefi"
    else
        firmware="bios"
    fi

    if [ "$install_env" = "onie" ]; then
        # determine ONIE partition type
        onie_partition_type=$(${onie_bin} onie-sysinfo -t)
        # demo partition size in MB
        if [ "$firmware" = "uefi" ] ; then
            create_demo_uefi_partition $blk_dev
        elif [ "$onie_partition_type" = "gpt" ] ; then
            create_demo_gpt_partition $blk_dev
        elif [ "$onie_partition_type" = "msdos" ] ; then
            create_demo_msdos_partition $blk_dev
        else
            echo "ERROR: Unsupported partition type: $onie_partition_type"
            exit 1
        fi
    fi

}

mount_partition()
{

    demo_dev=$(echo $blk_dev | sed -e 's/\(mmcblk[0-9]\)/\1p/')$demo_part
    echo $blk_dev | grep -q nvme0 && demo_dev=$(echo $blk_dev | sed -e 's/\(nvme[0-9]n[0-9]\)/\1p/')$demo_part

    # Make filesystem
    mkfs.ext4 -L $demo_volume_label $demo_dev

    # Mount demo filesystem
    demo_mnt=$(${onie_bin} mktemp -d) || {
        echo "Error: Unable to create file system mount point"
        exit 1
    }
    trap_push "${onie_bin} fuser -km $demo_mnt || ${onie_bin} umount $demo_mnt || ${onie_bin} rmdir $demo_mnt || true"
    ${onie_bin} mount -t ext4 -o defaults,rw $demo_dev $demo_mnt || {
        echo "Error: Unable to mount $demo_dev on $demo_mnt"
        exit 1
    }

}

# Creates a new partition for the DEMO OS.
#
# arg $1 -- base block device
#
# Returns the created partition number in $demo_part
demo_part=""
# TODO: remove reference to "ACS-OS" after all baseimages are upgraded
legacy_volume_label="ACS-OS"
create_demo_gpt_partition()
{
    blk_dev="$1"

    # Create a temp fifo and store string in variable
    tmpfifo=$(mktemp -u)
    trap_push "rm $tmpfifo || true"
    mkfifo -m 600 "$tmpfifo"

    # See if demo partition already exists
    demo_part=$(sgdisk -p $blk_dev | grep -e "$demo_volume_label" -e "$legacy_volume_label" | awk '{print $1}')
    if [ -n "$demo_part" ] ; then
        # delete existing partitions
        # if there are multiple partitions matched, we should delete each one, except the current OS's
        # Note: You can use any character as a separator for sed, not just '/'
        echo "$demo_part" > $tmpfifo &
        while read -r part_index; do
            if [ "$blk_dev$part_index" = "$cur_part" ]; then continue; fi
            echo "deleting partition $part_index ..."
            # if the partition is already mounted, umount first
            df $blk_dev$part_index 2>/dev/null && {
                umount $blk_dev$part_index || {
                    echo "Error: Unable to umount $blk_dev$part_index"
                    exit 1
                }
            }
            sgdisk -d $part_index $blk_dev || {
                echo "Error: Unable to delete partition $part_index on $blk_dev"
                exit 1
            }
            partprobe || {
                echo "Error: Unable to partprobe"
                exit 1
            }
        done < $tmpfifo
    fi

    # ASSUME: there are no more than 99999 partitions in a block device
    all_part=$(sgdisk -p $blk_dev | awk "{if (\$1 > 0 && \$1 <= 99999) print \$1}")
    # Get the index of last partition
    # Note: the double quotation marks for echo argument are necessary, otherwise the unquoted version replaces each sequence of
    #   one or more blanks, tabs and newlines with a single space.
    # Ref: http://stackoverflow.com/questions/613572/capturing-multiple-line-output-to-a-bash-variable
    last_part=$(echo "$all_part" | tail -n 1 | awk '{print $1}')
    # Find next available partition
    demo_part=1
    echo "$all_part" > $tmpfifo &
    # Find the first available partition number
    while read -r used_part; do
        echo "Partition #$used_part is in use."
        if [ "$used_part" -ne "$demo_part" ]; then break; fi
        demo_part=`expr $demo_part + 1`
    done < $tmpfifo
    echo "Partition #$demo_part is available"

    # Create new partition
    echo "Creating new $demo_volume_label partition ${blk_dev}${blk_suffix}$demo_part ..."

    if [ "$demo_type" = "DIAG" ] ; then
        # set the GPT 'system partition' attribute bit for the DIAG
        # partition.
        attr_bitmask="0x1"
    else
        attr_bitmask="0x0"
    fi
    sgdisk --new=${demo_part}::+${demo_part_size}MB \
        --attributes=${demo_part}:=:$attr_bitmask \
        --change-name=${demo_part}:$demo_volume_label $blk_dev \
    || {
        echo "Warning: The first trial of creating partition failed, trying the largest aligned available block of sectors on the disk"
        begin=$(sgdisk -F $blk_dev)
        end=$(sgdisk -E $blk_dev)
        sgdisk --new=${demo_part}:$begin:$end \
            --attributes=${demo_part}:=:$attr_bitmask \
            --change-name=${demo_part}:$demo_volume_label $blk_dev
    } || {
        echo "Error: Unable to create partition $demo_part on $blk_dev"
        exit 1
    }
    ## If running in normal Linux, partprobe will complain as below and return non-zero
    ##   Error: Partition(s) 4 on /dev/sda have been written, but we have been unable to inform the kernel of the change,
    ##   probably because it/they are in use.  As a result, the old partition(s) will remain in use.  You should reboot now
    ##   before making further changes.
    partprobe || true
}

create_demo_msdos_partition()
{
    blk_dev="$1"

    # See if demo partition already exists -- look for the filesystem
    # label.
    part_info="$(blkid | grep -e "$demo_volume_label" -e "$legacy_volume_label" | awk -F: '{print $1}')"
    if [ -n "$part_info" ] ; then
        # delete existing partition
        demo_part="$(echo -n $part_info | sed -e s#${blk_dev}##)"
        parted -s $blk_dev rm $demo_part || {
            echo "Error: Unable to delete partition $demo_part on $blk_dev"
            exit 1
        }
        partprobe
    fi

    # Find next available partition
    last_part_info="$(parted -s -m $blk_dev unit s print | tail -n 1)"
    last_part_num="$(echo -n $last_part_info | awk -F: '{print $1}')"
    last_part_end="$(echo -n $last_part_info | awk -F: '{print $3}')"
    # Remove trailing 's'
    last_part_end=${last_part_end%s}
    demo_part=$(( $last_part_num + 1 ))
    demo_part_start=$(( $last_part_end + 1 ))
    # sectors_per_mb = (1024 * 1024) / 512 = 2048
    sectors_per_mb=2048
    demo_part_end=$(( $demo_part_start + ( $demo_part_size * $sectors_per_mb ) - 1 ))

    # Create new partition
    echo "Creating new partition ${blk_dev}$demo_part ..."
    parted -s --align optimal $blk_dev unit s \
      mkpart primary $demo_part_start $demo_part_end set $demo_part boot on || {
        echo "ERROR: Problems creating msdos partition $demo_part on: $blk_dev"
        exit 1
    }
    partprobe
}

# For UEFI systems, create a new partition for the DEMO OS.
#
# arg $1 -- base block device
#
# Returns the created partition number in $demo_part
create_demo_uefi_partition()
{
    create_demo_gpt_partition "$1"

    # erase any related EFI BootOrder variables from NVRAM.
    for b in $(efibootmgr | grep -e "$demo_volume_label" -e "$legacy_volume_label" | awk '{ print $1 }') ; do
        local num=${b#Boot}
        # Remove trailing '*'
        num=${num%\*}
        efibootmgr -b $num -B > /dev/null 2>&1
    done
}

# Install legacy BIOS GRUB for DEMO OS
demo_install_grub()
{
    local demo_mnt="$1"
    local blk_dev="$2"

    # Pretend we are a major distro and install GRUB into the MBR of
    # $blk_dev.
    grub-install --boot-directory="$onie_initrd_tmp/$demo_mnt" --recheck "$blk_dev" || {
        echo "ERROR: grub-install failed on: $blk_dev"
        exit 1
    }

    if [ "$demo_type" = "DIAG" ] ; then
        # Install GRUB in the partition also.  This allows for
        # chainloading the DIAG image from another OS.
        #
        # We are installing GRUB in a partition, as opposed to the
        # MBR.  With this method block lists are used to refer to the
        # the core.img file.  The sector locations of core.img may
        # change whenever the file system in the partition is being
        # altered (files copied, deleted etc.). For more info, see
        # https://bugzilla.redhat.com/show_bug.cgi?id=728742 and
        # https://bugzilla.redhat.com/show_bug.cgi?id=730915.
        #
        # The workaround for this is to set the immutable flag on
        # /boot/grub/i386-pc/core.img using the chattr command so that
        # the sector locations of the core.img file in the disk is not
        # altered. The immutable flag on /boot/grub/i386-pc/core.img
        # needs to be set only if GRUB is installed to a partition
        # boot sector or a partitionless disk, not in case of
        # installation to MBR.

        core_img="$demo_mnt/grub/i386-pc/core.img"
        # remove immutable flag if file exists during the update.
        [ -f "$core_img" ] && chattr -i $core_img

        grub_install_log=$(mktemp)
        grub-install --force --boot-directory="$onie_initrd_tmp/$demo_mnt" \
            --recheck "$demo_dev" > /$grub_install_log 2>&1 || {
            echo "ERROR: grub-install failed on: $demo_dev"
            cat $grub_install_log && rm -f $grub_install_log
            exit 1
        }

        rm -f $grub_install_log

        # restore immutable flag on the core.img file as discussed
        # above.
        [ -f "$core_img" ] && chattr +i $core_img

    fi

}

# Install UEFI BIOS GRUB for DEMO OS
demo_install_uefi_grub()
{
    local demo_mnt="$1"
    local blk_dev="$2"

    # make sure /boot/efi is mounted
    if ! mount | grep -q "/boot/efi"; then
        mount /boot/efi
    fi

    # Look for the EFI system partition UUID on the same block device as
    # the ONIE-BOOT partition.
    local uefi_part=0
    for p in $(seq 8) ; do
        if sgdisk -i $p $blk_dev | grep -q C12A7328-F81F-11D2-BA4B-00A0C93EC93B ; then
            uefi_part=$p
            break
        fi
    done

    [ $uefi_part -eq 0 ] && {
        echo "ERROR: Unable to determine UEFI system partition"
        exit 1
    }

    grub_install_log=$(mktemp)
    grub-install \
        --no-nvram \
        --bootloader-id="$demo_volume_label" \
        --efi-directory="/boot/efi" \
        --boot-directory="$demo_mnt" \
        --recheck \
        "$blk_dev" > /$grub_install_log 2>&1 || {
        echo "ERROR: grub-install failed on: $blk_dev"
        cat $grub_install_log && rm -f $grub_install_log
        exit 1
    }
    rm -f $grub_install_log

    # Configure EFI NVRAM Boot variables.  --create also sets the
    # new boot number as active.
    grub=$(find /boot/efi/EFI/$demo_volume_label/ -name grub*.efi -exec basename {} \;)
    efibootmgr --quiet --create \
        --label "$demo_volume_label" \
        --disk $blk_dev --part $uefi_part \
        --loader "/EFI/$demo_volume_label/$grub" || {
        echo "ERROR: efibootmgr failed to create new boot variable on: $blk_dev"
        exit 1
    }

}

# Install UEFI BIOS SHIM for DEMO OS
demo_install_uefi_shim()
{
    echo "demo_install_uefi_shim(): Installing Secure Boot components"

    local demo_mnt="$1"
    local blk_dev="$2"

    # make sure /boot/efi is mounted
    if ! mount | grep -q "/boot/efi"; then
        mount /boot/efi || {
            echo "Error: Unable to mount /boot/efi"
            exit 1
        }
    fi

    # Look for the EFI system partition UUID on the same block device as
    # the ONIE-BOOT partition.
    local uefi_part=0
    for p in $(seq 8) ; do
        if sgdisk -i $p $blk_dev | grep -q C12A7328-F81F-11D2-BA4B-00A0C93EC93B ; then
            uefi_part=$p
            break
        fi
    done

    [ $uefi_part -eq 0 ] && {
        echo "ERROR: Unable to determine UEFI system partition"
        exit 1
    }

    echo "creating demo_volume_label=$demo_volume_label in dir: /boot/efi/EFI/ ."
    mkdir -p /boot/efi/EFI/$demo_volume_label

    if [ ! -f $demo_mnt/$image_dir/boot/mmx64.efi ]; then
        echo "ERROR: $demo_mnt/$image_dir/boot/mmx64.efi file does not exist"
        exit 1
    fi

    if [ ! -f $demo_mnt/$image_dir/boot/shimx64.efi ]; then
        echo "ERROR: $demo_mnt/$image_dir/boot/shimx64.efi file does not exist"
        exit 1
    fi

    if [ ! -f $demo_mnt/$image_dir/boot/grubx64.efi ]; then
        echo "ERROR: $demo_mnt/$image_dir/boot/grubx64.efi file does not exist"
        exit 1
    fi

    echo "copying signed shim, mm, grub, grub.cfg from $demo_mnt/$image_dir/boot/ to /boot/efi/EFI/$demo_volume_label directory"
    cp $demo_mnt/$image_dir/boot/mmx64.efi /boot/efi/EFI/$demo_volume_label/mmx64.efi
    cp $demo_mnt/$image_dir/boot/shimx64.efi /boot/efi/EFI/$demo_volume_label/shimx64.efi
    cp $demo_mnt/$image_dir/boot/grubx64.efi /boot/efi/EFI/$demo_volume_label/grubx64.efi

    # Configure EFI NVRAM Boot variables.  --create also sets the
    # new boot number as active.
    efibootmgr --quiet --create \
        --label "$demo_volume_label" \
        --disk $blk_dev --part $uefi_part \
        --loader "/EFI/$demo_volume_label/shimx64.efi" || {
        echo "ERROR: efibootmgr failed to create new boot variable on: $blk_dev"
        exit 1
    }
    echo "demo_install_uefi_shim(): Secure Boot components installed successfully"
}

bootloader_menu_config()
{

    if [ "$install_env" = "onie" ]; then
        # Store installation log in target file system
        rm -f $onie_initrd_tmp/tmp/onie-support*.tar.bz2
        ${onie_bin} onie-support /tmp
        mv $onie_initrd_tmp/tmp/onie-support*.tar.bz2 $demo_mnt/$image_dir/

        echo "firmware=$firmware"
        if [ "$firmware" = "uefi" ] ; then
            secure_boot_state=0
            reg_sb_guid=""
            ENABLED=1
            echo "checking secure boot state"
            reg_sb_guid=$(efivar -l | grep "SecureBoot$") || echo "Secure Boot GUID not found in efivar list"
            echo "Secure Boot GUID=$reg_sb_guid"
            if [ -n "$reg_sb_guid" ]; then
                secure_boot_state=$(efivar -d --name $reg_sb_guid) || echo "Could not read Secure Boot state from efivar"
            fi
            echo secure_boot_state=$secure_boot_state
            if expr "$secure_boot_state" : '[[:digit:]]\{1,\}' >/dev/null && [ "$secure_boot_state" -eq "$ENABLED" ]; then
                echo "UEFI Secure Boot is enabled - Installing shim bootloader"
                demo_install_uefi_shim "$demo_mnt" "$blk_dev"
            else
                echo "UEFI Secure Boot is disabled - Installing regular grub bootloader"
                demo_install_uefi_grub "$demo_mnt" "$blk_dev"
            fi
        else
        demo_install_grub "$demo_mnt" "$blk_dev"
        fi
    fi

    # Create a minimal grub.cfg that allows for:
    #   - configure the serial console
    #   - allows for grub-reboot to work
    #   - a menu entry for the DEMO OS
    #   - menu entries for ONIE

    grub_cfg=$(mktemp)
    trap_push "rm $grub_cfg || true"

    # Set a few GRUB_xxx environment variables that will be picked up and
    # used by the 50_onie_grub script.  This is similiar to what an OS
    # would specify in /etc/default/grub.
    #
    # GRUB_SERIAL_COMMAND
    # GRUB_CMDLINE_LINUX

    [ -r ./platform.conf ] && . ./platform.conf

    # Check if the CPU vendor is 'Intel' and disable c-states if True
    CPUVENDOR="$(cat /proc/cpuinfo | grep -m 1 vendor_id | awk '{print $3}')"
    echo "Switch CPU vendor is: $CPUVENDOR"
    if echo "$CPUVENDOR" | grep -i 'Intel' >/dev/null 2>&1; then
        echo "Switch CPU cstates are: disabled"
        CSTATES="processor.max_cstate=1 intel_idle.max_cstate=0"
    else
        CSTATES=""
    fi

    DEFAULT_GRUB_SERIAL_COMMAND="serial --port=${CONSOLE_PORT} --speed=${CONSOLE_SPEED} --word=8 --parity=no --stop=1"
    DEFAULT_GRUB_CMDLINE_LINUX="console=tty0 console=ttyS${CONSOLE_DEV},${CONSOLE_SPEED}n8 quiet $CSTATES"
    GRUB_SERIAL_COMMAND=${GRUB_SERIAL_COMMAND:-"$DEFAULT_GRUB_SERIAL_COMMAND"}
    GRUB_CMDLINE_LINUX=${GRUB_CMDLINE_LINUX:-"$DEFAULT_GRUB_CMDLINE_LINUX"}
    export GRUB_SERIAL_COMMAND
    export GRUB_CMDLINE_LINUX

    # Add common configuration, like the timeout and serial console.
    cat <<EOF > $grub_cfg
$GRUB_SERIAL_COMMAND
terminal_input console serial
terminal_output console serial

set timeout=5

EOF

    # Add the logic to support grub-reboot and grub-set-default
    cat <<EOF >> $grub_cfg
if [ -s \$prefix/grubenv ]; then
    load_env
fi
if [ "\${saved_entry}" ]; then
    set default="\${saved_entry}"
fi
if [ "\${next_entry}" ]; then
    set default="\${next_entry}"
    unset next_entry
    save_env next_entry
fi
if [ "\${onie_entry}" ]; then
    set next_entry="\${default}"
    set default="\${onie_entry}"
    unset onie_entry
    save_env onie_entry next_entry
fi
EOF

    if [ "$demo_type" = "DIAG" ] ; then
        # Make sure ONIE install mode is the default boot mode for the
        # diag partition.
        cat <<EOF >> $grub_cfg
set default=ONIE
EOF
        $onie_root_dir/tools/bin/onie-boot-mode -q -o install
    fi

    # Add a menu entry for the SONiC OS
    # Note: assume that apparmor is supported in the kernel
    demo_grub_entry="$demo_volume_revision_label"
    if [ "$install_env" = "sonic" ]; then
        old_sonic_menuentry=$(cat /host/grub/grub.cfg | sed "/^menuentry '${demo_volume_label}-${running_sonic_revision}'/,/}/!d")
        grub_cfg_root=$(echo $old_sonic_menuentry | sed -e "s/.*root\=\(.*\)rw.*/\1/")
        onie_menuentry=$(cat /host/grub/grub.cfg | sed "/menuentry ONIE/,/}/!d")
    elif [ "$install_env" = "build" ]; then
        grub_cfg_root=%%SONIC_ROOT%%
    else # install_env = "onie"
        uuid=$(blkid "$demo_dev" | sed -ne 's/.* UUID=\"\([^"]*\)\".*/\1/p')
        if [ -z "$uuid" ]; then
        grub_cfg_root=$demo_dev
        else
        grub_cfg_root=UUID=$uuid
        fi
    fi

# Make a first grub config file that located in default debian path:/boot/efi/EFI/debian/
# this first grub.cfg will call the complete grub.cfg created below with sonic configuration
tmp_config=$(mktemp)
cat <<EOF > $tmp_config
search --no-floppy --label --set=root $demo_volume_label
set prefix=(\$root)'/grub'
configfile \$prefix/grub.cfg
EOF

# Copy first grub.cfg as entrypoint to default debian path where grubx64.efi expected it.
mkdir -p /boot/efi/EFI/debian/
echo "cp $tmp_config /boot/efi/EFI/debian/grub.cfg"
cp $tmp_config /boot/efi/EFI/debian/grub.cfg

# Add extra linux command line
echo "EXTRA_CMDLINE_LINUX=$extra_cmdline_linux"
GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX $extra_cmdline_linux"
GRUB_CFG_LINUX_CMD=""
GRUB_CFG_INITRD_CMD=""
if [ "$firmware" = "uefi" ] &&  expr "$secure_boot_state" : '[[:digit:]]\{1,\}' >/dev/null && [ "$secure_boot_state" -eq "$ENABLED" ]; then
    # grub.cfg when BIOS is UEFI and support Secure Boot
    GRUB_CFG_LINUX_CMD="linuxefi"
    GRUB_CFG_INITRD_CMD="initrdefi"
else
    # grub.cfg when BIOS is Legacy
    GRUB_CFG_LINUX_CMD="linux"
    GRUB_CFG_INITRD_CMD="initrd"
fi

cat <<EOF >> $grub_cfg
menuentry '$demo_grub_entry' {
        search --no-floppy --label --set=root $demo_volume_label
        echo    'Loading $demo_volume_label $demo_type kernel ...'
        insmod gzio
        if [ x$grub_platform = xxen ]; then insmod xzio; insmod lzopio; fi
        insmod part_msdos
        insmod ext2
        $GRUB_CFG_LINUX_CMD   /$image_dir/boot/vmlinuz-6.1.0-11-2-${arch} root=$grub_cfg_root rw $GRUB_CMDLINE_LINUX  \
                net.ifnames=0 biosdevname=0 \
                loop=$image_dir/$FILESYSTEM_SQUASHFS loopfstype=squashfs                       \
                systemd.unified_cgroup_hierarchy=0 \
                apparmor=1 security=apparmor varlog_size=$VAR_LOG_SIZE usbcore.autosuspend=-1 $ONIE_PLATFORM_EXTRA_CMDLINE_LINUX
        echo    'Loading $demo_volume_label $demo_type initial ramdisk ...'
        $GRUB_CFG_INITRD_CMD  /$image_dir/boot/initrd.img-6.1.0-11-2-${arch}
}
EOF

    if [ "$install_env" = "onie" ]; then
        # Add menu entries for ONIE -- use the grub fragment provided by the
        # ONIE distribution.
        $onie_root_dir/grub.d/50_onie_grub >> $grub_cfg
        mkdir -p $onie_initrd_tmp/$demo_mnt/grub
    else
    cat <<EOF >> $grub_cfg
$old_sonic_menuentry
$onie_menuentry
EOF
    fi

    if [ "$install_env" = "build" ]; then
        cp $grub_cfg $demo_mnt/grub.cfg
        umount $demo_mnt
    else
        cp $grub_cfg $onie_initrd_tmp/$demo_mnt/grub/grub.cfg

        # Create a blank environment block file.
        if [ ! -f "$onie_initrd_tmp/$demo_mnt/grub/grubenv" ]; then
            grub-editenv "$onie_initrd_tmp/$demo_mnt/grub/grubenv" create || {
                echo "ERROR: grub-editenv failed on: $blk_dev"
                exit 1
            }
        fi
    fi

    cd /

    echo "Installed SONiC base image $demo_volume_label successfully"

}