rpi-sb-provisioner.sh

#!/bin/sh

set -e
set -x

TARGET_DEVICE_SERIAL="$1"
DEBUG=

OPENSSL=${OPENSSL:-openssl}

export KEYWRITER_FINISHED="KEYWRITER-FINISHED"
export KEYWRITER_ABORTED="KEYWRITER-ABORTED"
export KEYWRITER_STARTED="KEYWRITER-STARTED"
export PROVISIONER_FINISHED="PROVISIONER-FINISHED"
export PROVISIONER_ABORTED="PROVISIONER-ABORTED"
export PROVISIONER_STARTED="PROVISIONER-STARTED"


ring_bell() {
    tput bel
}

announce_start() {
    provisioner_log "================================================================================"

    provisioner_log "Starting $1"

    provisioner_log "================================================================================"
}

announce_stop() {
    provisioner_log "================================================================================"

    provisioner_log "Stopping $1"

    provisioner_log "================================================================================"
}

read_config() {
    if [ -f /etc/rpi-sb-provisioner/config ]; then
        . /etc/rpi-sb-provisioner/config
    else
        echo "Failed to load config. Please use configuration tool." >&2
        return 1
    fi
}

get_signing_directives() {
    if [ -n "${CUSTOMER_KEY_PKCS11_NAME}" ]; then
        echo "${CUSTOMER_KEY_PKCS11_NAME} -engine pkcs11 -keyform engine"
    else
        if [ -n "${CUSTOMER_KEY_FILE_PEM}" ]; then
            if [ -f "${CUSTOMER_KEY_FILE_PEM}" ]; then
                echo "${CUSTOMER_KEY_FILE_PEM} -keyform PEM"
            else
                echo "RSA private key \"${CUSTOMER_KEY_FILE_PEM}\" not a file. Aborting." >&2
                exit 1
            fi
        else
            echo "Neither PKCS11 key name, or PEM key file specified. Aborting." >&2
            exit 1
        fi
    fi
}

echo "${KEYWRITER_STARTED}" >> /var/log/rpi-sb-provisioner/"${TARGET_DEVICE_SERIAL}"/progress

read_config

die() {
    echo "${PROVISIONER_ABORTED}" >> /var/log/rpi-sb-provisioner/"${TARGET_DEVICE_SERIAL}"/progress
    # shellcheck disable=SC2086
    echo "$@" ${DEBUG}
    exit 1
}

keywriter_log() {
    echo "$@" >> /var/log/rpi-sb-provisioner/"${TARGET_DEVICE_SERIAL}"/keywriter.log
}

provisioner_log() {
    echo "$@" >> /var/log/rpi-sb-provisioner/"${TARGET_DEVICE_SERIAL}"/provisioner.log
}

CUSTOMER_PUBLIC_KEY_FILE=
derivePublicKey() {
    CUSTOMER_PUBLIC_KEY_FILE="$(mktemp)"
    "${OPENSSL}" rsa -in "${CUSTOMER_KEY_FILE_PEM}" -pubout > "${CUSTOMER_PUBLIC_KEY_FILE}"
}

TMP_DIR=""

writeSig() {
   SIG_TMP="$(mktemp)"
   IMAGE="$1"
   OUTPUT="$2"
   sha256sum "${IMAGE}" | awk '{print $1}' > "${OUTPUT}"

   # Include the update-timestamp
   echo "ts: $(date -u +%s)" >> "${OUTPUT}"

   if [ -n "$(get_signing_directives)" ]; then
      # shellcheck disable=SC2046
      "${OPENSSL}" dgst -sign $(get_signing_directives) -sha256 -out "${SIG_TMP}" "${IMAGE}"
      echo "rsa2048: $(xxd -c 4096 -p < "${SIG_TMP}")" >> "${OUTPUT}"
   fi
   rm "${SIG_TMP}"
}

enforceSecureBootloaderConfig() {
    if ! grep -Fxq "SIGNED_BOOT=1" "${RPI_DEVICE_BOOTLOADER_CONFIG_FILE}"; then
        echo "SIGNED_BOOT=1" >> "${RPI_DEVICE_BOOTLOADER_CONFIG_FILE}"
        sed -i -e "s/SIGNED_BOOT=0//g" "${RPI_DEVICE_BOOTLOADER_CONFIG_FILE}"
    fi

    # These directives are for the bootloader to load the ramdisk
    # Don't use the traditional boot flow, and instead look for boot.img/boot.sig
    echo "boot_ramdisk=1" >> "${FLASHING_DIR}/config.txt"
    # Log to the UART, so you can inspect the process
    echo "uart_2ndstage=1" >> "${FLASHING_DIR}/config.txt"
    #echo "eeprom_write_protect=1" >> "${FLASHING_DIR}/config.txt"
}

identifyBootloaderConfig() {
    # Possible to pass in RPI_DEVICE_BOOTLOADER_CONFIG_FILE... we should make sure the right thing happens with this.
    if [ ! -f "${RPI_DEVICE_BOOTLOADER_CONFIG_FILE}" ]; then
        RPI_DEVICE_BOOTLOADER_CONFIG_FILE="$(mktemp)"
    fi
}

# This function is adapted from the functions in the usbboot repo.
update_eeprom() {
    src_image="$1"
    dst_image="$2"
    pem_file="$3" 
    public_pem_file="$4"
    sign_args=""

    if [ -n "${pem_file}" ]; then
        if ! grep -q "SIGNED_BOOT=1" "${RPI_DEVICE_BOOTLOADER_CONFIG_FILE}"; then
            # If the OTP bit to require secure boot are set then then
            # SIGNED_BOOT=1 is implicitly set in the EEPROM config.
            # For debug in signed-boot mode it's normally useful to set this
            keywriter_log "Warning: SIGNED_BOOT=1 not found in \"${RPI_DEVICE_BOOTLOADER_CONFIG_FILE}\""
        fi

        #update_version=$(strings "${src_image}" | grep BUILD_TIMESTAMP | sed 's/.*=//g')

        TMP_CONFIG_SIG="$(mktemp)"
        keywriter_log "Signing bootloader config"
        writeSig "${RPI_DEVICE_BOOTLOADER_CONFIG_FILE}" "${TMP_CONFIG_SIG}"

        # shellcheck disable=SC2086
        cat "${TMP_CONFIG_SIG}" ${DEBUG}

        # rpi-eeprom-config extracts the public key args from the specified
        # PEM file.
        sign_args="-d ${TMP_CONFIG_SIG} -p ${public_pem_file}"

        case ${RPI_DEVICE_FAMILY} in
            4)
                # 2711 does _not_ require a signed bootcode binary
                cp "${src_image}" "${dst_image}.intermediate"
                ;;
            5)
                customer_signed_bootcode_binary_workdir=$(mktemp -d)
                cd "${customer_signed_bootcode_binary_workdir}" || return
                rpi-eeprom-config -x "${src_image}"
                rpi-sign-bootcode --debug -c 2712 -i bootcode.bin -o bootcode.bin.signed -k "${pem_file}" -v 0 -n 16
                rpi-eeprom-config \
                    --out "${dst_image}.intermediate" --bootcode "${customer_signed_bootcode_binary_workdir}/bootcode.bin.signed" \
                    "${src_image}" || die "Failed to update signed bootcode in the EEPROM image"
                cd - > /dev/null || return
                rm -rf "${customer_signed_bootcode_binary_workdir}"
                ;;
        esac
    fi

    rm -f "${dst_image}"
    set -x
    # shellcheck disable=SC2086
    rpi-eeprom-config \
        --config "${RPI_DEVICE_BOOTLOADER_CONFIG_FILE}" \
        --out "${dst_image}" ${sign_args} \
        "${dst_image}.intermediate" || die "Failed to update EEPROM image"
    rm -f "${dst_image}.intermediate"
    rm -f "${TMP_CONFIG_SIG}"
    set +x

cat <<EOF
new-image: ${dst_image}
source-image: ${src_image}
config: ${RPI_DEVICE_BOOTLOADER_CONFIG_FILE}
EOF
}

get_cryptroot() {
    if [ -f /etc/rpi-sb-provisioner/cryptroot_initramfs ]; then
        echo "/etc/rpi-sb-provisioner/cryptroot_initramfs"
    else
        echo "/var/lib/rpi-sb-provisioner/cryptroot_initramfs"
    fi
}

get_fastboot_gadget() {
    if [ -f /etc/rpi-sb-provisioner/fastboot-gadget.img ]; then
        echo "/etc/rpi-sb-provisioner/fastboot-gadget.img"
    else
        echo "/var/lib/rpi-sb-provisioner/fastboot-gadget.img"
    fi
}

get_fastboot_config_file() {
    if [ -f /etc/rpi-sb-provisioner/boot_ramdisk_config.txt ]; then
        echo "/etc/rpi-sb-provisioner/boot_ramdisk_config.txt"
    else
        echo "/var/lib/rpi-sb-provisioner/boot_ramdisk_config.txt"
    fi
}

# check_file_is_expected ${path_to_file} ${expected_file_extension}
# Checks if a file exists, is not a directory, is not zero and has the right extension.
# If any of those checks fail, exit the script entirely and print a debug message
# If all checks succeed, supply the filepath via stdout
check_file_is_expected() {
    filepath="$1"
    ext="$2"

    if [ ! -e "${filepath}" ]; then
        die "Specified file does not exist: ${filepath}"
    fi

    if [ -d "${filepath}" ]; then
        die "Expected a file, got a directory for ${filepath}"
    fi

    if [ -z "${filepath}" ]; then
        die "Provided file is empty: ${filepath}"
    fi

    if [ -z "${ext}" ] || echo "${filepath}" | grep -q "${ext}"; then
        echo "${filepath}"
        return 0
    else
        die "Provided file is of the wrong extension, wanted ${ext}, provided ${filepath}"
    fi
}

check_command_exists() {
    command_to_test=$1
    if ! command -v "${command_to_test}" 1> /dev/null; then
        provisioner_log "${command_to_test} could not be found"
        exit 1
    else
        echo "$command_to_test"
    fi
}

check_python_module_exists() {
    module_name=$1
    if ! python -c "import ${module_name}" 1> /dev/null; then
        provisioner_log "Failed to load Python module '${module_name}'"
        exit 1
    else
        echo "${module_name}"
    fi
}

check_pidevice_storage_type() {
    case "${1}" in
        "sd")
            echo "mmcblk0"
            ;;
        "nvme")
            echo "nvme0n1"
            ;;
        "emmc")
            echo "mmcblk0"
            ;;
        ?)
            die "Unexpected storage device type. Wanted sd, nvme or emmc, got $1"
            ;;
    esac
}

# Lifted from pi-gen/scripts/common, unsure under what circumstances this would be necessary
ensure_next_loopdev() {
    loopdev="$(losetup -f)"
    loopmaj="$(echo "$loopdev" | sed -E 's/.*[0-9]*?([0-9]+)$/\1/')"
    [ -b "$loopdev" ] || mknod "$loopdev" b 7 "$loopmaj"
}

# Lifted from pi-gen/scripts/common, unsure under what circumstances this would be necessary
ensure_loopdev_partitions() {
    lsblk -r -n -o "NAME,MAJ:MIN" "$1" | grep -v "^${1#/dev/}" | while read -r line; do
        partition="${line%% *}"
        majmin="${line#* }"
        if [ ! -b "/dev/$partition" ]; then
            mknod "/dev/$partition" b "${majmin%:*}" "${majmin#*:}"
        fi
    done
}

# Lifted from pi-gen/scripts/common
unmount() {
    if [ -z "$1" ]; then
        DIR=$PWD
    else
        DIR=$1
    fi

    while mount | grep -q "$DIR"; do
        locs=$(mount | grep "$DIR" | cut -f 3 -d ' ' | sort -r)
        for loc in $locs; do
            umount "$loc"
        done
    done
}

# Lifted from pi-gen/scripts/common
unmount_image() {
    sync
    sleep 1
    LOOP_DEVICE=$(losetup --list | grep "$1" | cut -f1 -d' ')
    if [ -n "$LOOP_DEVICE" ]; then
        for part in "$LOOP_DEVICE"p*; do
            if DIR=$(findmnt -n -o target -S "$part"); then
                unmount "$DIR"
            fi
        done
        losetup -d "$LOOP_DEVICE"
    fi
}

cleanup() {
    if [ -d "${TMP_DIR}" ]; then
        rm -rf "${TMP_DIR}"
    fi
    rm "${CUSTOMER_PUBLIC_KEY_FILE}"

    unmount_image "${COPY_OS_COMBINED_FILE}"
    if [ -d "${TMP_DIR}" ]; then
        rm -rf "${TMP_DIR}"
    fi

    if [ -f "${COPY_OS_COMBINED_FILE}" ]; then
        rm -rf "${COPY_OS_COMBINED_FILE}"
    fi
    if [ -n "${DELETE_PRIVATE_TMPDIR}" ]; then
        announce_start "Deleting customised intermediates"
        # shellcheck disable=SC2086
        rm -rf "${DELETE_PRIVATE_TMPDIR}" ${DEBUG}
        DELETE_PRIVATE_TMPDIR=
        announce_stop "Deleting customised intermediates"
    fi
}
trap cleanup EXIT

FLASHING_DIR=$(mktemp -d)
derivePublicKey
identifyBootloaderConfig
enforceSecureBootloaderConfig

SOURCE_EEPROM_IMAGE=
DESTINATION_EEPROM_IMAGE=
DESTINATION_EEPROM_SIGNATURE=
BOOTCODE_BINARY_IMAGE=
BOOTCODE_FLASHING_NAME=
case ${RPI_DEVICE_FAMILY} in
    4)
        SOURCE_EEPROM_IMAGE="/lib/firmware/raspberrypi/bootloader-2711/latest/pieeprom-2024-09-05.bin"
        BOOTCODE_BINARY_IMAGE="/lib/firmware/raspberrypi/bootloader-2711/latest/recovery.bin"
        BOOTCODE_FLASHING_NAME="${FLASHING_DIR}/bootcode4.bin"
        ;;
    5)
        SOURCE_EEPROM_IMAGE="/lib/firmware/raspberrypi/bootloader-2712/latest/pieeprom-2024-09-23.bin"
        BOOTCODE_BINARY_IMAGE="/lib/firmware/raspberrypi/bootloader-2712/latest/recovery.bin"
        BOOTCODE_FLASHING_NAME="${FLASHING_DIR}/bootcode5.bin"
        ;;
    *)
        keywriter_log "Unable to identify Raspberry Pi HW Family. Aborting."
        exit 1
esac

DESTINATION_EEPROM_IMAGE="${FLASHING_DIR}/pieeprom.bin"
DESTINATION_EEPROM_SIGNATURE="${FLASHING_DIR}/pieeprom.sig"

if [ ! -e "${DESTINATION_EEPROM_SIGNATURE}" ]; then
    if [ ! -e "${SOURCE_EEPROM_IMAGE}" ]; then
        keywriter_log "No Raspberry Pi EEPROM file to use as key vector"
        exit 1
    else
        update_eeprom "${SOURCE_EEPROM_IMAGE}" "${DESTINATION_EEPROM_IMAGE}" "${CUSTOMER_KEY_FILE_PEM}" "${CUSTOMER_PUBLIC_KEY_FILE}"
        writeSig "${DESTINATION_EEPROM_IMAGE}" "${DESTINATION_EEPROM_SIGNATURE}"
    fi
fi

### NOTE: Use this in only case of a partial signing situation, where you have provisioned the key, but need to re-write the eeprom.
# case ${RPI_DEVICE_FAMILY} in
#     4)
#         cp "${BOOTCODE_BINARY_IMAGE}" "${BOOTCODE_FLASHING_NAME}"
#         ;;
#     5)
#         rpi-sign-bootcode --debug -c 2712 -i "${BOOTCODE_BINARY_IMAGE}" -o "${BOOTCODE_FLASHING_NAME}" -k "${CUSTOMER_KEY_FILE_PEM}" -v 0 -n 16
#         ;;
# esac
### In the completely-unprovisioned state, where you have not yet written a customer OTP key, simply make the copy of the unsigned bootcode
cp "${BOOTCODE_BINARY_IMAGE}" "${BOOTCODE_FLASHING_NAME}"
####

# This directive informs the bootloader to write the public key into OTP
echo "program_pubkey=1" > "${FLASHING_DIR}/config.txt"
# This directive tells the bootloader to reboot once it's written the OTP
echo "recovery_reboot=1" >> "${FLASHING_DIR}/config.txt"

if [ -n "${RPI_DEVICE_FETCH_METADATA}" ]; then
echo "recovery_metadata=1" >> "${FLASHING_DIR}/config.txt"
fi

if [ -n "${RPI_DEVICE_JTAG_LOCK}" ]; then
echo "program_jtag_lock=1" >> "${FLASHING_DIR}/config.txt"
fi

if [ -n "${RPI_DEVICE_EEPROM_WP_SET}" ]; then
echo "eeprom_write_protect=1" >> "${FLASHING_DIR}/config.txt"
fi

# With the EEPROMs configured and signed, RPIBoot them.
mkdir -p "/var/log/rpi-sb-provisioner/${TARGET_DEVICE_SERIAL}/metadata/"
keywriter_log "Writing key and EEPROM configuration to the device"
set +e
[ -z "${DEMO_MODE_ONLY}" ] && timeout 120 rpiboot -d "${FLASHING_DIR}" -i "${TARGET_DEVICE_SERIAL}" -j "/var/log/rpi-sb-provisioner/${TARGET_DEVICE_SERIAL}/metadata/"
KEYWRITER_EXIT_STATUS=$?
if [ $KEYWRITER_EXIT_STATUS -eq 124 ]
then
keywriter_log "Writing failed, timed out."
echo "${KEYWRITER_ABORTED}" >> /var/log/rpi-sb-provisioner/"${TARGET_DEVICE_SERIAL}"/progress
return 124
else
keywriter_log "Writing completed."
fi
set -e

rm -rf "${FLASHING_DIR}"

if [ -z "${DEMO_MODE_ONLY}" ] && [ -n "${RPI_DEVICE_FETCH_METADATA}" ]; then
    USER_BOARDREV="0x$(jq -r '.USER_BOARDREV' < /var/log/rpi-sb-provisioner/"${TARGET_DEVICE_SERIAL}"/metadata/"${TARGET_DEVICE_SERIAL}".json)"
    MAC_ADDRESS=$(jq -r '.MAC_ADDR' < /var/log/rpi-sb-provisioner/"${TARGET_DEVICE_SERIAL}"/metadata/"${TARGET_DEVICE_SERIAL}".json)

    TYPE=$(printf "0x%X\n" $(((USER_BOARDREV & 0xFF0) >> 4)))
    PROCESSOR=$(printf "0x%X\n" $(((USER_BOARDREV & 0xF000) >> 12)))
    MEMORY=$(printf "0x%X\n" $(((USER_BOARDREV & 0x700000) >> 20)))
    MANUFACTURER=$(printf "0x%X\n" $(((USER_BOARDREV & 0xF0000) >> 16)))
    REVISION=$((USER_BOARDREV & 0xF))

    case ${TYPE} in
        "0x11") BOARD_STR="CM4" ;;
        "0x12") BOARD_STR="Zero 2 W" ;;
        "0x13") BOARD_STR="400" ;;
        "0x14") BOARD_STR="CM4" ;;
        "0x15") BOARD_STR="CM4S" ;;
        "0x17") BOARD_STR="5" ;;
        *)
            BOARD_STR="Unsupported Board"
    esac

    case ${PROCESSOR} in
        "0x0") PROCESSOR_STR="BCM2835" ;;
        "0x1") PROCESSOR_STR="BCM2836" ;;
        "0x2") PROCESSOR_STR="BCM2837" ;;
        "0x3") PROCESSOR_STR="BCM2711" ;;
        "0x4") PROCESSOR_STR="BCM2712" ;;
        *)
            PROCESSOR_STR="Unknown"
    esac

    case ${MEMORY} in
        "0x0") MEMORY_STR="256MB" ;;
        "0x1") MEMORY_STR="512MB" ;;
        "0x2") MEMORY_STR="1GB" ;;
        "0x3") MEMORY_STR="2GB" ;;
        "0x4") MEMORY_STR="4GB" ;;
        "0x5") MEMORY_STR="8GB" ;;
        *)
            MEMORY_STR="Unknown"
    esac

    case ${MANUFACTURER} in
        "0x0") MANUFACTURER_STR="Sony UK" ;;
        "0x1") MANUFACTURER_STR="Egoman" ;;
        "0x2") MANUFACTURER_STR="Embest" ;;
        "0x3") MANUFACTURER_STR="Sony Japan" ;;
        "0x4") MANUFACTURER_STR="Embest" ;;
        "0x5") MANUFACTURER_STR="Stadium" ;;
        *)
            MANUFACTURER_STR="Unknown"
    esac

    keywriter_log "Board is: ${BOARD_STR}, with revision number ${REVISION}. Has Processor ${PROCESSOR_STR} with Memory ${MEMORY_STR}. Was manufactured by ${MANUFACTURER_STR}"
fi
keywriter_log "Keywriting completed. Rebooting for next phase."

echo "${KEYWRITER_FINISHED}" >> /var/log/rpi-sb-provisioner/"${TARGET_DEVICE_SERIAL}"/progress

### Start the provisioner phase

echo "${PROVISIONER_STARTED}" >> /var/log/rpi-sb-provisioner/"${TARGET_DEVICE_SERIAL}"/progress

# These tools are used to modify the supplied images, and deal with mounting and unmounting the images.
check_command_exists losetup
check_command_exists mknod
check_command_exists lsblk
check_command_exists cut
check_command_exists findmnt

# openssl is used to verify and transform the supplied key
check_command_exists openssl

# python is used by the Raspberry Pi usbboot scripts, and used as part of transforming the supplied key.
check_command_exists python
# pycryptodome is a python module used by the Raspberry Pi usbboot scripts
check_python_module_exists Cryptodome

# These tools are used for modifying and packaging the initramfs
check_command_exists zstd
check_command_exists cpio
check_command_exists sed
check_command_exists cp
check_command_exists mount

# Fastboot is used as a transfer mechanism to get images and metadata to and from the Raspberry Pi device
check_command_exists fastboot

check_command_exists blockdev

check_command_exists grep

get_variable() {
    [ -z "${DEMO_MODE_ONLY}" ] && fastboot getvar "$1" 2>&1 | grep -oP "${1}"': \K.*'
}

TMP_DIR=$(mktemp -d)
RPI_DEVICE_STORAGE_TYPE="$(check_pidevice_storage_type "${RPI_DEVICE_STORAGE_TYPE}")"
DELETE_PRIVATE_TMPDIR=
announce_start "Finding the cache directory"
if [ -z "${RPI_SB_WORKDIR}" ]; then
    RPI_SB_WORKDIR=$(mktemp -d "pi-sb-provisioner.XXX" --tmpdir="/srv/")
    announce_stop "Finding the cache directory: Created a new one as unspecified"
    DELETE_PRIVATE_TMPDIR="true"
elif [ ! -d "${RPI_SB_WORKDIR}" ]; then
    RPI_SB_WORKDIR=$(mktemp -d "pi-sb-provisioner.XXX" --tmpdir="/srv/")
    announce_stop "Finding the cache directory: Created a new one in /srv, as supplied path isn't a directory"
    DELETE_PRIVATE_TMPDIR="true"
else
    # Deliberately do nothing
    announce_stop "Finding the cache directory: Using specified name"
fi

announce_start "Finding/generating fastboot image"

case "${RPI_DEVICE_FAMILY}" in
    4)
        # Raspberry Pi 4-class devices do not use signed bootcode files, so just copy the file into the relevant place.
        cp /usr/share/rpiboot/mass-storage-gadget64/bootfiles.bin "${RPI_SB_WORKDIR}/bootfiles.bin"
        ;;
    5)
        FASTBOOT_SIGN_DIR=$(mktemp -d)
        cd "${FASTBOOT_SIGN_DIR}"
        tar -vxf /usr/share/rpiboot/mass-storage-gadget64/bootfiles.bin
        rpi-sign-bootcode --debug -c 2712 -i 2712/bootcode5.bin -o 2712/bootcode5.bin.signed -k "${CUSTOMER_KEY_FILE_PEM}" -v 0 -n 16
        mv -f "2712/bootcode5.bin.signed" "2712/bootcode5.bin"
        tar -vcf "${RPI_SB_WORKDIR}/bootfiles.bin" -- *
        cd -
        rm -rf "${FASTBOOT_SIGN_DIR}"
        ;;
    *)
        die "Could not identify RPI_DEVICE_FAMILY. Got ${RPI_DEVICE_FAMILY}, wanted 4 or 5."
esac

cp "$(get_fastboot_gadget)" "${RPI_SB_WORKDIR}"/boot.img

cp "$(get_fastboot_config_file)" "${RPI_SB_WORKDIR}"/config.txt

#boot.sig generation
sha256sum "${RPI_SB_WORKDIR}"/boot.img | awk '{print $1}' > "${RPI_SB_WORKDIR}"/boot.sig
printf 'rsa2048: ' >> "${RPI_SB_WORKDIR}"/boot.sig
# Prefer PKCS11 over PEM keyfiles, if both are specified.
# shellcheck disable=SC2046
${OPENSSL} dgst -sign $(get_signing_directives) -sha256 "${RPI_SB_WORKDIR}"/boot.img | xxd -c 4096 -p >> "${RPI_SB_WORKDIR}"/boot.sig

announce_stop "Finding/generating fastboot image"

announce_start "Starting fastboot"
set +e
[ -z "${DEMO_MODE_ONLY}" ] && timeout 120 rpiboot -v -d "${RPI_SB_WORKDIR}" -i "${TARGET_DEVICE_SERIAL}"
FLASHING_GADGET_EXIT_STATUS=$?
if [ $FLASHING_GADGET_EXIT_STATUS -eq 124 ]
then
provisioner_log "Loading Fastboot failed, timed out."
echo "${PROVISIONER_ABORTED}" >> /var/log/rpi-sb-provisioner/"${TARGET_DEVICE_SERIAL}"/progress
return 124
else
provisioner_log "Fastboot loaded."
fi
set -e
announce_stop "Starting fastboot"

announce_start "Selecting and interrogating device"

#announce_start "Getting target information"
#TARGET_STORAGE_LIST_RESULT="$(get_variable storage-types-list)"
#TARGET_PI_GENERATION="$(get_variable hw-generation)"
#TARGET_DUID="$(get_variable device-uuid)"
#TARGET_SERIAL="$(get_variable serialno)"
#announce_stop "Getting target information"

#announce_start "Storage device check"
#STORAGE_FOUND=0
#for device in ${TARGET_STORAGE_LIST_RESULT}
#do
#    if [ ${device} == ${RPI_DEVICE_STORAGE_TYPE} ]; then
#        STORAGE_FOUND=1
#    fi
#done

#if ! ${STORAGE_FOUND}; then
#    die "Selected storage type is not available, wanted one of [${TARGET_STORAGE_LIST_RESULT}], got ${RPI_DEVICE_STORAGE_TYPE}"
#fi

#announce_stop "Storage device check"

#announce_start "Raspberry Pi Generation check"
#if ${RPI_DEVICE_FAMILY} != ${TARGET_PI_GENERATION}; then
#    die "Raspberry Pi Generation mismatch. Expected a Raspberry Pi ${TARGET_PI_GENERATION} class device, you supplied ${RPI_DEVICE_FAMILY}"
#fi
#announce_stop "Raspberry Pi Generation check"

# Fast path: If we've already generated the assets, just move to flashing.
if [ ! -e "${RPI_SB_WORKDIR}/bootfs-temporary.img" ] ||
   [ ! -e "${RPI_SB_WORKDIR}/rootfs-temporary.simg" ]; then

    announce_start "OS Image Mounting"
    COPY_OS_COMBINED_FILE=$(mktemp "working-os-image.XXX" --tmpdir="/srv/")
    announce_start "OS Image Copying (potentially slow)"
    cp "${GOLD_MASTER_OS_FILE}" "${COPY_OS_COMBINED_FILE}"
    announce_stop "OS Image Copying (potentially slow)"
    # Mount the 'complete' image as a series of partitions 
    cnt=0
    until ensure_next_loopdev && LOOP_DEV="$(losetup --show --find --partscan "${COPY_OS_COMBINED_FILE}")"; do
        if [ $cnt -lt 5 ]; then
            cnt=$((cnt + 1))
            provisioner_log "Error in losetup.  Retrying..."
            sleep 5
        else
            provisioner_log "ERROR: losetup failed; exiting"
            sleep 5
        fi
    done

    ensure_loopdev_partitions "$LOOP_DEV"
    BOOT_DEV="${LOOP_DEV}"p1
    ROOT_DEV="${LOOP_DEV}"p2

    # shellcheck disable=SC2086
    mkdir -p "${TMP_DIR}"/rpi-boot-img-mount ${DEBUG}
    # shellcheck disable=SC2086
    mkdir -p "${TMP_DIR}"/rpi-rootfs-img-mount ${DEBUG}

    # OS Images are, by convention, packed as a MBR whole-disk file,
    # containing two partitions: A FAT boot partition, which contains the kernel, command line,
    # and supporting boot infrastructure for the Raspberry Pi Device.
    # And in partition 2, the OS rootfs itself.
    # Note that this mechanism is _assuming_ Linux. We may revise that in the future, but
    # to do so would require a concrete support commitment from the vendor - and Raspberry Pi only
    # support Linux.
    # shellcheck disable=SC2086
    mount -t vfat "${BOOT_DEV}" "${TMP_DIR}"/rpi-boot-img-mount ${DEBUG}
    # shellcheck disable=SC2086
    mount -t ext4 "${ROOT_DEV}" "${TMP_DIR}"/rpi-rootfs-img-mount ${DEBUG}

    announce_stop "OS Image Mounting"

    # We supply a pre-baked Raspberry Pi Pre-boot-authentication initramfs, which we insert here.
    # This image is maintained by Raspberry Pi, with sources available on our GitHub pages.
    announce_start "Insert pre-boot authentication initramfs"
    cp "$(get_cryptroot)" "${TMP_DIR}"/rpi-boot-img-mount/initramfs8
    cp "$(get_cryptroot)" "${TMP_DIR}"/rpi-boot-img-mount/initramfs_2712
    announce_stop "Insert pre-boot authentication initramfs"

    announce_start "Initramfs modification"

    augment_initramfs() {
        # shellcheck disable=SC2155
        initramfs_compressed_file=$(check_file_is_expected "$1" "")
        # shellcheck disable=SC2086
        mkdir -p "${TMP_DIR}"/initramfs ${DEBUG}
        # shellcheck disable=SC2086
        zstd --rm -f -d "${initramfs_compressed_file}" -o "${TMP_DIR}"/initramfs.cpio ${DEBUG}
        # shellcheck disable=SC2155
        rootfs_mount=$(realpath "${TMP_DIR}"/rpi-rootfs-img-mount)
        cd "${TMP_DIR}"/initramfs 
        # shellcheck disable=SC2086
        cpio -id < ../initramfs.cpio ${DEBUG}
        # shellcheck disable=SC2086
        rm ../initramfs.cpio ${DEBUG}

        # Insert required kernel modules
        initramfs_dir="$PWD"/ # trailing '/' is meaningful
        cd "${rootfs_mount}"
        find usr/lib/modules \
            \( \
                -name 'dm-mod.*' \
                -o \
                -name 'dm-crypt.*' \
                -o \
                -name 'af_alg.*' \
                -o \
                -name 'algif_skcipher.*' \
                -o \
                -name 'libaes.*' \
                -o \
                -name 'aes_generic.*' \
                -o \
                -name 'aes-arm64.*' \
            \) \
            -exec cp -r --parents "{}" "${initramfs_dir}" \;
        cd -

        find . -print0 | cpio --null -ov --format=newc > ../initramfs.cpio
        cd "${TMP_DIR}"
        rm -rf "${TMP_DIR}"/initramfs
        zstd --no-progress --rm -f -6 "${TMP_DIR}"/initramfs.cpio -o "${initramfs_compressed_file}"
    }

    # Use subshells to avoid polluting our CWD.
    if check_file_is_expected "${TMP_DIR}"/rpi-boot-img-mount/initramfs_2712 ""; then
        ( augment_initramfs "${TMP_DIR}"/rpi-boot-img-mount/initramfs_2712 )
    fi
    if check_file_is_expected "${TMP_DIR}"/rpi-boot-img-mount/initramfs8 ""; then
        ( augment_initramfs "${TMP_DIR}"/rpi-boot-img-mount/initramfs8 )
    fi
    announce_stop "Initramfs modification"

    announce_start "cmdline.txt modification"
    sed --in-place 's%\b\(root=\)\S*%\1/dev/ram0%' "${TMP_DIR}"/rpi-boot-img-mount/cmdline.txt
    sed --in-place 's%\binit=\S*%%' "${TMP_DIR}"/rpi-boot-img-mount/cmdline.txt
    sed --in-place 's%\brootfstype=\S*%%' "${TMP_DIR}"/rpi-boot-img-mount/cmdline.txt
    # TODO: Consider deleting quiet
    sed --in-place 's%\bquiet\b%%' "${TMP_DIR}"/rpi-boot-img-mount/cmdline.txt
    announce_stop "cmdline.txt modification"

    announce_start "config.txt modification"
    sed --in-place 's%^\(auto_initramfs=\S*\)%#\1%' "${TMP_DIR}"/rpi-boot-img-mount/config.txt

    case "${RPI_DEVICE_FAMILY}" in
        4)
            echo 'initramfs initramfs8' >> "${TMP_DIR}"/rpi-boot-img-mount/config.txt
            ;;
        5)
            echo 'initramfs initramfs_2712' >> "${TMP_DIR}"/rpi-boot-img-mount/config.txt
            ;;
    esac
    
    announce_stop "config.txt modification"

    announce_start "boot.img creation"
    cp "$(get_fastboot_config_file)" "${TMP_DIR}"/config.txt

    make-boot-image -b "pi${RPI_DEVICE_FAMILY}" -d "${TMP_DIR}"/rpi-boot-img-mount -o "${TMP_DIR}"/boot.img
    announce_stop "boot.img creation"

    announce_start "boot.img signing"
    # N.B. rpi-eeprom-digest could be used here but it includes a timestamp that is not required for this use-case
    sha256sum "${TMP_DIR}"/boot.img | awk '{print $1}' > "${TMP_DIR}"/boot.sig
    printf 'rsa2048: ' >> "${TMP_DIR}"/boot.sig
    # shellcheck disable=SC2046
    ${OPENSSL} dgst -sign $(get_signing_directives) -sha256 "${TMP_DIR}"/boot.img | xxd -c 4096 -p >> "${TMP_DIR}"/boot.sig
    announce_stop "boot.img signing"

    announce_start "Boot Image partition extraction"

    REQUIRED_BOOTIMG_SIZE="$(stat -c%s "${TMP_DIR}"/boot.img)"
    REQUIRED_BOOTSIG_SIZE="$(stat -c%s "${TMP_DIR}"/boot.sig)"
    REQUIRED_CONFIGTXT_SIZE="$(stat -c%s "${TMP_DIR}"/config.txt)"
    SECTOR_SIZE=512
    TOTAL_SIZE=$((REQUIRED_BOOTIMG_SIZE + REQUIRED_BOOTSIG_SIZE + REQUIRED_CONFIGTXT_SIZE))
    TOTAL_SIZE=$((TOTAL_SIZE + 64))
    TOTAL_SIZE=$(((TOTAL_SIZE + 1023) / 1024))
    SECTORS=$((TOTAL_SIZE / SECTOR_SIZE))
    SECTORS=$((SECTORS / 2))
    # HACK: pi-gen is producing 512mib boot images, but we should _really_ calculate this from the base image.
    dd if=/dev/zero of="${TMP_DIR}"/bootfs-temporary.img bs=1M count=512
    mkfs.fat -n "BOOT" "${TMP_DIR}"/bootfs-temporary.img

    META_BOOTIMG_MOUNT_PATH=$(mktemp -d)
    mount -o loop "${TMP_DIR}"/bootfs-temporary.img "${META_BOOTIMG_MOUNT_PATH}"
    cp "${TMP_DIR}"/boot.img "${META_BOOTIMG_MOUNT_PATH}"/boot.img
    cp "${TMP_DIR}"/boot.sig "${META_BOOTIMG_MOUNT_PATH}"/boot.sig
    cp "${TMP_DIR}"/config.txt "${META_BOOTIMG_MOUNT_PATH}"/config.txt

    sync; sync; sync;

    umount "${META_BOOTIMG_MOUNT_PATH}"
    rm -rf "${META_BOOTIMG_MOUNT_PATH}"
    mv "${TMP_DIR}"/bootfs-temporary.img "${RPI_SB_WORKDIR}"/bootfs-temporary.img
    announce_stop "Boot Image partition extraction"
fi # Slow path

announce_start "Erase / Partition Device Storage"

# Arbitrary sleeps to handle lack of correct synchronisation in fastbootd.
set +e
[ -z "${DEMO_MODE_ONLY}" ] && timeout 30 fastboot getvar version
FASTBOOT_EXIT_STATUS=$?
if [ $FASTBOOT_EXIT_STATUS -eq 124 ]
then
provisioner_log "Loading Fastboot failed, timed out."
echo "${PROVISIONER_ABORTED}" >> /var/log/rpi-sb-provisioner/"${TARGET_DEVICE_SERIAL}"/progress
return 124
else
provisioner_log "Fastboot loaded."
fi
set -e

[ -z "${DEMO_MODE_ONLY}" ] && fastboot erase "${RPI_DEVICE_STORAGE_TYPE}"
sleep 2
[ -z "${DEMO_MODE_ONLY}" ] && fastboot oem partinit "${RPI_DEVICE_STORAGE_TYPE}" DOS
sleep 2
[ -z "${DEMO_MODE_ONLY}" ] && fastboot oem partapp "${RPI_DEVICE_STORAGE_TYPE}" 0c "$(stat -c%s "${RPI_SB_WORKDIR}"/bootfs-temporary.img)"
sleep 2
[ -z "${DEMO_MODE_ONLY}" ] && fastboot oem partapp "${RPI_DEVICE_STORAGE_TYPE}" 83 # Grow to fill storage
sleep 2
[ -z "${DEMO_MODE_ONLY}" ] && fastboot oem cryptinit "${RPI_DEVICE_STORAGE_TYPE}"p2 root
sleep 2
[ -z "${DEMO_MODE_ONLY}" ] && fastboot oem cryptopen "${RPI_DEVICE_STORAGE_TYPE}"p2 cryptroot
sleep 2
announce_stop "Erase / Partition Device Storage"

announce_start "Resizing OS images"
# Need mke2fs with '-E android_sparse' support
# Debian's 'android-sdk-platform-tools' provides the option but is not correctly
# built against libsparse: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1008107
#
# https://dl.google.com/android/repository/platform-tools-latest-linux.zip
# https://dl.google.com/android/repository/platform-tools-latest-darwin.zip
# https://dl.google.com/android/repository/platform-tools-latest-windows.zip
TARGET_STORAGE_ROOT_EXTENT="$(get_variable partition-size:mapper/cryptroot)"
if [ -f "${RPI_SB_WORKDIR}/rootfs-temporary.simg" ] && [ "$((TARGET_STORAGE_ROOT_EXTENT))" -eq "$(stat -c%s "${RPI_SB_WORKDIR}"/rootfs-temporary.simg)" ]; then
    announce_stop "Resizing OS images: Not required, already the correct size"
else
    mke2fs -t ext4 -b 4096 -d "${TMP_DIR}"/rpi-rootfs-img-mount "${RPI_SB_WORKDIR}"/rootfs-temporary.simg $((TARGET_STORAGE_ROOT_EXTENT / 4096))
    #TODO: Re-enable android_sparse
    #mke2fs -t ext4 -b 4096 -d ${TMP_DIR}/rpi-rootfs-img-mount -E android_sparse ${RPI_SB_WORKDIR}/rootfs-temporary.simg $((TARGET_STORAGE_ROOT_EXTENT / 4096))
    announce_stop "Resizing OS images: Resized to $((TARGET_STORAGE_ROOT_EXTENT))"
fi

announce_start "Writing OS images"
[ -z "${DEMO_MODE_ONLY}" ] && fastboot flash "${RPI_DEVICE_STORAGE_TYPE}"p1 "${RPI_SB_WORKDIR}"/bootfs-temporary.img
[ -z "${DEMO_MODE_ONLY}" ] && fastboot flash mapper/cryptroot "${RPI_SB_WORKDIR}"/rootfs-temporary.simg
announce_stop "Writing OS images"

announce_start "Cleaning up"
[ -d "${TMP_DIR}/rpi-boot-img-mount" ] && umount "${TMP_DIR}"/rpi-boot-img-mount
[ -d "${TMP_DIR}/rpi-rootfs-img-mount" ] && umount "${TMP_DIR}"/rpi-rootfs-img-mount
# shellcheck disable=SC2086
unmount_image "${COPY_OS_COMBINED_FILE}" ${DEBUG}
# We also delete the temporary directory - preserving the cached generated asset
# shellcheck disable=SC2086
rm -rf "${TMP_DIR}" ${DEBUG}
announce_stop "Cleaning up"

announce_start "Set LED status"
[ -z "${DEMO_MODE_ONLY}" ] && fastboot oem led PWR 0
announce_stop "Set LED status"

mkdir -p /var/log/rpi-sb-provisioner/"${TARGET_DEVICE_SERIAL}"/
echo "${PROVISIONER_FINISHED}" >> /var/log/rpi-sb-provisioner/"${TARGET_DEVICE_SERIAL}"/progress

provisioner_log "Provisioning completed. Remove the device from this machine."