#!/bin/bash
set -eo pipefail

help=$'Generate Tarball with PNOR image and MANIFEST Script

Generates a PNOR SquashFS image from the PNOR image for VPNOR,
Or use a static layout raw PNOR image,
Creates a MANIFEST for image verification and recreation
Packages the image and MANIFEST together in a tarball

usage: generate-tar [OPTION] <PNOR FILE>...

Options:
-i, --image <squashfs|static>
Generate SquashFS image or use static PNOR
-f, --file <file>      Specify destination file. Defaults to
$(pwd)/<PNOR FILE>.pnor.<image_type>.tar[.gz] if
unspecified.
(For example,
    * "generate-tar -i squashfs my.pnor" would generate
    $(pwd)/my.pnor.squashfs.tar
    * "generate-tar -i static my.pnor" would generate
$(pwd)/my.pnor.static.tar.gz)
-s, --sign <path>      Sign the image. The optional path argument specifies
the private key file. Defaults to the bash variable
PRIVATE_KEY_PATH if available, or else uses the
open-source private key in this script.
-m, --machine <name>   Optionally specify the target machine name of this
image.
-h, --help             Display this help text and exit.
'

private_key=$'-----BEGIN PRIVATE KEY-----
MIIJRAIBADANBgkqhkiG9w0BAQEFAASCCS4wggkqAgEAAoICAQDO7vWM6ZOylO6T
lxDiRWgKCFauAxMVM4A7NmgZxfV73xqTzAtIzzF9CIKUEhqMT4LhNy1rU2oUUivH
4BZO2oC6yFafEPVla2oYAeWtXJmQTixYgJplKQCtLzFtb57DQJpl9Od0RVFC61yg
4LihsiENnRjncLPP7OkL68ssiELu+WxazDtewmVYQEHOMWQa2zDh9yrWsblLAyo4
gsG9rdwWjqIUnZkoeJuT7zks4Jes4qAtQUuZhCxMcvwvOq8od3e4nLVFnyUOGMpE
jdDDGddKh5e+9BJGqkfsLCT9UFTYi62Ifuxl1Gp963cZLapJS0CneHIrG3gapiCO
ea4TH/xySfts2jpl7DnEIUo3Qs0rZrOLQDLVVXvRJvHdsVoZcSRCD8Jf0YTQ6tT7
j3ejUOH8j3DGkgKRHGtH7yyCgmDyPYVQdEu3q4E1NBwODAyxppYGBqkwpSGRnf6q
E6i5rQJuoPCm3rb9ZmoHVzeb8HW3ofYfNnZNuae/2LdEtJ/cFs8ILXP5AKiaKpmS
H4GB8GUcgRMITGI1pcXhevO2wHi0ReJkme+m5GpuVIg9LpTs6YvvNoFeu6ux7up/
TjTa+Zdy3tLUZvvIIlS2Asu32uiGBFjZ2WiLeHq+ScaDsSyEJQkoYLqv+3MoPKhy
iX4yanZCwG3yx68RDe9qQBt6WXqAEwIDAQABAoICAA6OxAqKQiA9lv0eEwuAC34t
MP/j6ntC2MIRpUgu44K34tRD9gVEwjwEFb+Z+HEnhNMYQSM8RomwcDELBDa+63B4
eJOPK1xbrqaKt6A3E/yRa1A8l+AG/uuwFr+WqyocSOBkVsYYvEtDaIxO0t5ZPDcL
dr2NcbDuf0Sd7XiwC1lphaRrmr+jWGLZfmellN/IzMsQytw4u4rZ6aX5GO0hpoqV
tTRTE/vDZFqHaVPNZw48ET2tysY9hKpKKpCeBcWIhg0gRSZlOEOiHdStz2JyVnGB
UX0XCZQcFZw5TM7fUGC9jtM77qCJTYaXQpUsX77xQtalRA7hS1VAm6i6SbNBvE4j
le2JWBmOCbh9A/Dqnxh/3R2ZpsbffMG3O4KLkObquP8QGsItxwZYm4Bo37/HS6ki
1Ilym014DUT1+mTybi+2TjlPgh2LeECo1lbgFRJ/p9Vs7TJV2jeVPKDHF72cVvp2
Ly6dGQVtBPz7/HpvxwYA5TJstNWgiU1sZPwgVzhgeZEKt5DO3Da6DVoXt96/tHk4
577MA9P4qYLJldq5rfFW3IeyGUjLZ1yLmmDWj2Hz2IQe/YqrHHQH5UO6xxhrjuCa
FrAOv7wJxmmbhZ9AptmR0PnmTU79LM8gxyNY9nn0R+XMJd/3UvrrjzJWw+LUGdhC
zG0pF0JGMb71wHwlmmUpAoIBAQDyUHAcpgWtCl70qVpHnAG6WnsRP6ZS0dtBjqnN
l9GachlNLOyQHfKcs7Vj7dkrcumSTbZ7zzgsazQcwfJMEvVq2RS8iTrtKAq+yYmj
uejaJ3gAuiaU5Shv9PL+P25zGlwJtqEADYjiSrzO1ZRgM1M31tlH7f0wjYIrV6LP
5P5HYFVDFujsiWY9oUZ+PFaCWPRQ2P47zF3ocbiqD9TbFSwNfq5B2WPLCURExQAh
XT/GH8Devz2M79CWKjvDMQutZ8dcLZx6JNhpre5JoNbAxE2u9jIM++srSb41zArE
2lcy2tqNAWJV5jhFz5DZ451kvz7AKLaehWYj7D+TvX4V4UwpAoIBAQDanvWQCoop
Loh5s5tYwHB/iFE+jzVvyrytfRcDIjrBaCDCQrObgh/fllk44h9DpKHbM4nYlMpU
GXOsQCVkE/SiJakzeXfoecCJ3ebp+mlBILs79AWlfETJFLx1FKJQOQoraoICVFxx
jcI/OvGlABRLvRYhNnq22//IgLlyKWfO0yS6FASIjriIjDwibKZqHt+DJ98Lv2d+
1fsOw/Ai7e2e3nK0+2vmXusZAwpcPuTYb+5LOnHE7GbPecuM22BSTiUAekoHq3/k
fdYw+od4B4BJB0bAnRVu7y+TQXRkZ462RvP05AYXUzudjknv48mFuBslrybr3f50
aIwtFADeJrHbAoIBAQCYcEwnabaWZrjX+BZoiFd58eQMNNugrI7fzi06vrDJFdCf
AY0NGRoAxPlvFTmTIOaZ+LO9bd5r60FMeiLBAwhLoKdv+HEOsysXXVhunM1FOKFA
69rLvuJSlGmt0x/b35BZOABPNTSRD+15vVlrr75BmbL1kl2/BrcGJ0qwuOHS62KY
IziDXejpCqV7UuAlfmqs1eYSnn3RdoFy0yTYcphVIQXlPSqPl5PQI5LyamRtcpp2
Rx8ko9W4MneIUzmCbJA5iCQxny5aRWZsAXg4qwYn9JAGJRGMGQdFdsirkKRcxNvK
6zz+xydNm8gHmy7wK3QBlVtVnJxmKwDQI9zHTQYJAoIBAQDVKrXJ81zv9r1/3U8V
5N5MnACL/VtfW9FJYHU1ywR7XSrEAAHdGa42dwUcX++YJ0ji0YgRNFNsWTzesdVD
lemsyQgIduIiPcUtKL9lWZOTu3SVasSurVLstllj1/DERDnUR4/o8ZUJ6+2Bddn0
xvUDPKX9UH+rGSx4tnscA5+CnYJsJeSdunvYONTRxBsn0l6iJhhn/gPOOpsHtKnL
hS9y/vfd3GFDST33L23EsFa3a7xwgdY460D8AIgnGij7V9Lgel0AyYp0ovZc34uD
z9yYWI32dbRWbMZ40RPKaudOeDSbjlMaH0A7ymfxjqwKxI9D2VscFWNs4hv8QErw
Uc6NAoIBAQCmWWyARU/x4m7K4vNAWjD2Qx6R7PAdLs/6ZBqWw0RSpRHlYr73Qggw
dCK+LrsR0O7y1KW2WUfrJmzHEdFQEYcZ1vZWeN85dMLVhYmazSXlaIegRE4FmMUa
DbzViUJA60Y4D/l6QWqdhxdZZe81QgqyLPXAv/e5esxRIi8yvEYhCx4pq7QtWYBm
tvQnPaZd8emlKARivF2ecGDlWzhf4NotDDtFRT4jOHZKUC58uVjbiXJ445Vimqlb
Da7noVGwDQ93Ib1qyAilzFY5gWDeMyCnSQpnlVRHQ/8vlwLDsZs1kVau6k8WlcpM
JbmuCRNy7YvALVTzyQsQ4yw87BoONt1L
-----END PRIVATE KEY-----
'

# Reference the ffs structures at:
# https://github.com/open-power/hostboot/blob/master/src/usr/pnor/common/ffs_hb.H
# https://github.com/open-power/hostboot/blob/master/src/usr/pnor/ffs.h
ffs_entry_size=128
vercheck_offset=112
do_sign=false
PRIVATE_KEY_PATH=${PRIVATE_KEY_PATH:-}
private_key_path="${PRIVATE_KEY_PATH}"
image_type=""
outfile=""
declare -a partitions=()
tocfile="pnor.toc"
machine_name=""

while [[ $# -gt 0 ]]; do
  key="$1"
  case $key in
    -i|--image)
      image_type="$2"
      shift 2
      ;;
    -f|--file)
      outfile="$2"
      shift 2
      ;;
    -s|--sign)
      do_sign=true
      if [[ -n "${2}"  && "${2}" != -* ]]; then
        private_key_path="$2"
        shift 2
      else
        shift 1
      fi
      ;;
    -m|--machine)
      machine_name="$2"
      shift 2
      ;;
    -h|--help)
      echo "$help"
      exit
      ;;
    *)
      pnorfile="$1"
      shift 1
      ;;
  esac
done

if [ ! -f "${pnorfile}" ]; then
  echo "Please enter a valid PNOR file."
  echo "$help"
  exit 1
fi

if [[ "${image_type}" == "squashfs" ]]; then
  echo "Will generate squashfs image for VPNOR"
elif [[ "${image_type}" == "static" ]]; then
  echo "Will use static image for PNOR"
else
  echo "Please specify the image type, \"squashfs\" or \"static\""
  echo
  echo "$help"
  exit 1
fi

if [[ -z $outfile ]]; then
    if [[ ${pnorfile##*.} == "pnor" ]]; then
        outfile=$(pwd)/${pnorfile##*/}.$image_type.tar
    else
        outfile=$(pwd)/${pnorfile##*/}.pnor.$image_type.tar
    fi
    if [[ "${image_type}" == "static" ]]; then
        # Append .gz so the tarball is compressed
        outfile=$outfile.gz
    fi
else
    if [[ $outfile != /* ]]; then
        outfile=$(pwd)/$outfile
    fi
fi


scratch_dir=$(mktemp -d)
# Remove the temp directory on exit.
# The files in the temp directory may contain read-only files, so add
# --interactive=never to skip the prompt.
trap '{ rm -r --interactive=never ${scratch_dir}; }' EXIT

if [[ "${do_sign}" == true ]]; then
  if [[ -z "${private_key_path}" ]]; then
    private_key_path=${scratch_dir}/OpenBMC.priv
    echo "${private_key}" > "${private_key_path}"
    echo "Image is NOT secure!! Signing with the open private key!"
  else
    if [[ ! -f "${private_key_path}" ]]; then
      echo "Couldn't find private key ${private_key_path}."
      exit 1
    fi

    echo "Signing with ${private_key_path}."
  fi

  public_key_file=publickey
  public_key_path=${scratch_dir}/$public_key_file
  openssl pkey -in "${private_key_path}" -pubout -out "${public_key_path}"
fi

echo "Parsing PNOR TOC..."

pnor_dir="${scratch_dir}/pnor"
mkdir "${pnor_dir}"

pflash --partition=part --read="${pnor_dir}"/part -F "${pnorfile}"
pflash --partition=VERSION --read="${pnor_dir}"/VERSION -F "${pnorfile}"
version_size=$(wc -c "${pnor_dir}"/VERSION | cut -d' ' -f 1)
magic_number=$(xxd -p -l 4 "${pnor_dir}"/VERSION)
# Check if VERSION is signed. A signed version partition will have an extra
# 4K header starting with the magic number 0x17082011, see:
# https://github.com/open-power/skiboot/blob/master/libstb/container.h#L47
if [ "$version_size" == "8192" ] && [ "$magic_number" == "17082011" ]; then
  # Advance past the STB header (4K, indexed from 1)
  cp "${pnor_dir}"/VERSION "${pnor_dir}"/VERSION_FULL
  tail --bytes=+4097 "${pnor_dir}"/VERSION_FULL > "${pnor_dir}"/VERSION
fi
{
  version=$(head -n 1 "${pnor_dir}"/VERSION)
  echo "version=$version"
  # shellcheck disable=SC2005,SC2046 # Need the echo to remove new lines, same
  # reason for not quoting the tail command
  extended_version=$(echo $(tail -n +2 "${pnor_dir}"/VERSION)|tr ' ' ',')
  echo "extended_version=$extended_version"
  while read -r line; do
    if [[ $line == "ID="* ]]; then
        # This line looks like
        # "ID=05 MVPD 000d9000..00169000 (actual=00090000) [ECC]"
        read -r -a fields <<< "$line"

        id=${fields[0]##*=}
        offset=$((ffs_entry_size * 10#${id} + vercheck_offset))
        vercheck=$(xxd -p -l  0x1 -seek ${offset} "${pnor_dir}"/part)
        # shellcheck disable=SC2155 # Need the export in the same line to avoid
        # pflash error
        export flags=$(pflash --detail=$((10#$id)) -F "${pnorfile}" | grep "\[" |
                sed 's/....$//' | tr '\n' ',' | sed 's/.$//')
        if [[ $flags != "" ]]; then
            flags=,$flags
        fi

        if [[ $(echo "$flags" | grep "READONLY") == "" &&
              $(echo "$flags" | grep "PRESERVED") == "" ]]; then
            flags=$flags,READWRITE
        fi

        # Need the partition ID, name, start location, end location, and flags
        echo  "partition${id}=${fields[1]},${fields[2]/../,},${vercheck}${flags}"

        # Save the partition name
        partitions+=("${fields[1]}")
    fi
  # Don't need the BACKUP_PART partition
  done < <(pflash --info -F "${pnorfile}" | grep -v "BACKUP")
} > "${pnor_dir}"/${tocfile}

for partition in "${partitions[@]}"; do
  echo "Reading ${partition}..."
  pflash --partition="${partition}" \
    --read="${pnor_dir}"/"${partition}" \
    -F "${pnorfile}"
done

manifest_location="MANIFEST"
files_to_sign="$manifest_location $public_key_file"

# Go to scratch_dir

if [[ "${image_type}" == "squashfs" ]]; then
  echo "Creating SquashFS image..."
  # Prepare pnor file in ${pnor_dir}
  cd "${pnor_dir}"
  # Set permissions of partition files to read only
  chmod 440 -- *
  # shellcheck disable=SC2048,SC2086 # Do not quote partitions since it lists
  # multiple files and mksquashfs would assume to be a single file name within
  # quotes
  mksquashfs ${tocfile} ${partitions[*]} "${scratch_dir}"/pnor.xz.squashfs -all-root
  cd "${scratch_dir}"
  files_to_sign+=" pnor.xz.squashfs"
else
  cp "${pnorfile}" "${scratch_dir}"
  cd "${scratch_dir}"
  files_to_sign+=" $(basename "${pnorfile}")"
fi

echo "Creating MANIFEST for the image"
echo -e "purpose=xyz.openbmc_project.Software.Version.VersionPurpose.Host\nversion=$version\n\
extended_version=$extended_version" >> $manifest_location

if [[ -n "${machine_name}" ]]; then
    echo -e "MachineName=${machine_name}" >> $manifest_location
fi

if [[ "${do_sign}" == true ]]; then
  private_key_name=$(basename "${private_key_path}")
  key_type="${private_key_name%.*}"
  echo KeyType="${key_type}" >> $manifest_location
  echo HashType="RSA-SHA256" >> $manifest_location

  for file in $files_to_sign; do
    openssl dgst -sha256 -sign "${private_key_path}" -out "${file}.sig" "$file"
  done

  additional_files="*.sig"
fi

if [[ "${image_type}" == "squashfs" ]]; then
  echo "Generating tarball to contain the SquashFS image and its MANIFEST"
  # shellcheck disable=SC2086 # Do not quote the files variables since they list
  # multiple files and tar would assume to be a single file name within quotes
  tar -cvf "$outfile" $files_to_sign $additional_files
  echo "SquashFSTarball at ${outfile}"
else
  # shellcheck disable=SC2086 # Do not quote the files variables since they list
  # multiple files and tar would assume to be a single file name within quotes
  tar -czvf "$outfile" $files_to_sign $additional_files
  echo "Static layout tarball at $outfile"
fi