#!/usr/bin/sh
#
# smartmontools drive database update script
#
# Home page of code is: https://www.smartmontools.org
#
# Copyright (C) 2010-20 Christian Franke
#
# SPDX-License-Identifier: GPL-2.0-or-later
#
# $Id: update-smart-drivedb.in 5153 2020-12-30 14:09:46Z chrfranke $
#

set -e

# Set by config.status
export PATH="/usr/local/bin:/usr/bin:/bin"
PACKAGE="smartmontools"
VERSION="7.2"
prefix="/usr"
exec_prefix="/usr"
sbindir="/usr/sbin"
datarootdir="${prefix}/share"
datadir="/usr/share"
drivedbdir="${datadir}/${PACKAGE}"

# Download tools
os_dltools="curl wget lynx svn"

# drivedb.h update branch
BRANCH="RELEASE_7_2_DRIVEDB"

# Default drivedb location
DRIVEDB="$drivedbdir/drivedb.h"

# GnuPG used to verify signature (disabled if empty)
GPG="gpg"

# Smartctl used for syntax check
SMARTCTL="$sbindir/smartctl"

# PATH information for help and error messages
#pathinfo='$PATH'
pathinfo="'$PATH'"

myname=$0

usage()
{
  pathinfo="
                   $pathinfo"
  cat <<EOF
smartmontools $VERSION drive database update script

Usage: $myname [OPTIONS] [DESTFILE]

  -s SMARTCTL     Use SMARTCTL for syntax check ('-s -' to disable)
                  [default: $SMARTCTL]
  -t TOOL         Use TOOL for download: $os_dltools
                  [default: first one found in $pathinfo]
  -u LOCATION     Use URL of LOCATION for download:
                    github (GitHub mirror of SVN repository)
                    sf (Sourceforge code browser)
                    svn (SVN repository) [default]
                    svni (SVN repository via HTTP instead of HTTPS)
                    trac (Trac code browser)
  --trunk         Download from SVN trunk (may require '--no-verify')
  --branch X.Y    Download from branches/RELEASE_X_Y_DRIVEDB
  --cacert FILE   Use CA certificates from FILE to verify the peer
  --capath DIR    Use CA certificate files from DIR to verify the peer
  --insecure      Don't abort download if certificate verification fails
  --no-verify     Don't verify signature
  --export-key    Print the OpenPGP/GPG public key block
  --dryrun        Print download commands only
  -v              Verbose output

Updates $DRIVEDB
or DESTFILE from branches/$BRANCH of smartmontools
SVN repository.
EOF
  exit 1
}

error()
{
  echo "$myname: $*" >&2
  exit 1
}

err_notfound()
{
  case $1 in
    */*) error "$1: not found $2" ;;
    *)   error "$1: not found in $pathinfo $2" ;;
  esac
}

warning()
{
  echo "$myname: (Warning) $*" >&2
}

selecturl()
{
  case $1 in
    github)  # https://github.com/smartmontools/smartmontools/raw/origin/$BRANCH/smartmontools/drivedb.h
             # https://github.com/smartmontools/smartmontools/raw/master/smartmontools/drivedb.h
          # redirected to:
          url='https://raw.githubusercontent.com/smartmontools/smartmontools/master/smartmontools/drivedb.h' ;;
    sf)   url='https://sourceforge.net/p/smartmontools/code/HEAD/tree/trunk/smartmontools/drivedb.h?format=raw' ;;
    svn)  url='https://svn.code.sf.net/p/smartmontools/code/trunk/smartmontools/drivedb.h' ;;
    svni) url='http://svn.code.sf.net/p/smartmontools/code/trunk/smartmontools/drivedb.h' ;;
    trac) url='https://www.smartmontools.org/export/HEAD/trunk/smartmontools/drivedb.h' ;;
    *) usage ;;
  esac
}

inpath()
{
  local d rc save
  rc=1
  save=$IFS
  IFS=':'
  for d in $PATH; do
    test -f "$d/$1" || continue
    test -x "$d/$1" || continue
    rc=0
    break
  done
  IFS=$save
  return $rc
}

vecho()
{
  test -n "$q" || echo "$*"
}

# vrun COMMAND ARGS...
vrun()
{
  if [ -n "$dryrun" ]; then
    echo "$*"
  elif [ -n "$q" ]; then
    "$@" 2>/dev/null
  else
    echo "$*"
    "$@"
  fi
}

# vrun2 OUTFILE COMMAND ARGS...
vrun2()
{
  local f err rc
  f=$1; shift
  rc=0
  if [ -n "$dryrun" ]; then
    echo "$* > $f"
  else
    vecho "$* > $f"
    err=`"$@" 2>&1 > $f` || rc=$?
    if [ -n "$err" ]; then
      vecho "$err" >&2
      test $rc != 0 || rc=42
    fi
  fi
  return $rc
}

# download URL FILE
download()
{
  local f u rc
  u=$1; f=$2
  rc=0

  case $tool in
    curl)
      # "Accept-Encoding" header avoids caching problems with svn URL
      vrun curl ${q:+-s} -f --max-redirs 0 \
        -H "Accept-Encoding: identity" \
        ${cacert:+--cacert "$cacert"} \
        ${capath:+--capath "$capath"} \
        ${insecure:+--insecure} \
        -o "$f" "$u" || rc=$?
      ;;

    wget)
      # wget >= 1.16.1 sets "Accept-Encoding: identity" header by default
      vrun wget $q --max-redirect=0 \
        ${cacert:+--ca-certificate="$cacert"} \
        ${capath:+--ca-directory="$capath"} \
        ${insecure:+--no-check-certificate} \
        -O "$f" "$u" || rc=$?
      ;;

    lynx)
      test -z "$cacert" || vrun export SSL_CERT_FILE="$cacert"
      test -z "$capath" || vrun export SSL_CERT_DIR="$capath"
      # Check also stderr as lynx does not return != 0 on HTTP error
      vrun2 "$f" lynx -stderr -noredir -source "$u" || rc=$?
      ;;

    svn)
      vrun svn $q export \
        --non-interactive --no-auth-cache \
        ${cacert:+--config-option "servers:global:ssl-trust-default-ca=no"} \
        ${cacert:+--config-option "servers:global:ssl-authority-files=$cacert"} \
        ${insecure:+--trust-server-cert} \
        "$u" "$f" || rc=$?
      ;;

    fetch) # FreeBSD
      vrun fetch $q --no-redirect \
        ${cacert:+--ca-cert "$cacert"} \
        ${capath:+--ca-path "$capath"} \
        ${insecure:+--no-verify-hostname} \
        -o "$f" "$u" || rc=$?
      ;;

    ftp) # OpenBSD
      vrun ftp \
        ${cacert:+-S cafile="$cacert"} \
        ${capath:+-S capath="$capath"} \
        ${insecure:+-S dont} \
        -o "$f" "$u" || rc=$?
      ;;

    *) error "$tool: unknown (internal error)" ;;
  esac
  return $rc
}

# check_file FILE FIRST_CHAR MIN_SIZE MAX_SIZE
check_file()
{
  local firstchar f maxsize minsize size
  test -z "$dryrun" || return 0
  f=$1; firstchar=$2; minsize=$3; maxsize=$4

  # Check first chars
  case `dd if="$f" bs=1 count=1 2>/dev/null` in
    $firstchar) ;;
    \<) echo "HTML error message"; return 1 ;;
    *)   echo "unknown file contents"; return 1 ;;
  esac

  # Check file size
  size=`wc -c < "$f"`
  if test "$size" -lt $minsize; then
    echo "too small file size $size bytes"
    return 1
  fi
  if test "$size" -gt $maxsize; then
    echo "too large file size $size bytes"
    return 1
  fi
  return 0
}

# unexpand_svn_id < INFILE > OUTFILE
unexpand_svn_id()
{
  sed 's,\$''Id'': drivedb\.h [0-9][0-9]* 2[-0-9]* [012][:0-9]*Z [a-z][a-z0-9]* \$,$''Id''$,'
}

# selectkey BRANCH
selectkey()
{
  case $1 in
    RELEASE_5_4[0-3]_DRIVEDB|RELEASE_6_[0-6]_DRIVEDB)
# Smartmontools Signing Key (ext. to 2024) <smartmontools-database@listi.jpberlin.de>
# Smartmontools Signing Key (through 2018) <smartmontools-database@listi.jpberlin.de>
# Smartmontools Signing Key (through 2018) <smartmontools-database@lists.sourceforge.net>
# Key ID DFD22559
public_key="\
-----BEGIN PGP PUBLIC KEY BLOCK-----

mQENBFgOYoEBCAC93841SlFmpp6640hKUvZ8PbZR6OGnZnMXD6QRVzpibXGZXUDB
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=3Lcg
-----END PGP PUBLIC KEY BLOCK-----
"
      ;;

    RELEASE_7_[02]_DRIVEDB)
# Smartmontools Signing Key (through 2025) <smartmontools-database@listi.jpberlin.de>
# Smartmontools Signing Key (through 2020) <smartmontools-database@listi.jpberlin.de>
# Key ID 721042C5
public_key="\
-----BEGIN PGP PUBLIC KEY BLOCK-----

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=7MQk
-----END PGP PUBLIC KEY BLOCK-----
"
      ;;

    *) error "No known public key for branches/$1" ;;
  esac
}

# gpg_verify FILE.asc FILE
gpg_verify()
{
  local gnupgtmp out rc

  # Create temp home dir
  gnupgtmp="$tmpdir/.gnupg.$$.tmp"
  rm -f -r "$gnupgtmp"
  mkdir "$gnupgtmp" || exit 1
  chmod 0700 "$gnupgtmp"

  # Import public key
  if ! out=`echo "$public_key" | "$GPG" --batch --no-tty --homedir="$gnupgtmp" --import 2>&1`; then
    echo "$out" >&2
    exit 1
  fi
  vecho "$out"

  # Verify
  rc=0
  out=`"$GPG" --batch --no-tty --homedir="$gnupgtmp" --verify "$1" "$2" </dev/null 2>&1` || rc=1
  if [ $rc = 0 ]; then
    vecho "$out"
  else
    # print gpg error always
    echo "$out" >&2
  fi

  rm -f -r "$gnupgtmp"
  return $rc
}

# mv_all PREFIX OLD NEW
mv_all()
{
  mv "${1}${2}"         "${1}${3}"
  mv "${1}${2}.raw"     "${1}${3}.raw"
  mv "${1}${2}.raw.asc" "${1}${3}.raw.asc"
}

# Parse options
smtctl=$SMARTCTL
tool=
urlid="svn"
q="-q"
dryrun=
trunk=
brnch=$BRANCH
cacert=
capath=
insecure=
no_verify=
expkey=

while true; do case $1 in
  -s)
    shift; test -n "$1" || usage
    smtctl=$1 ;;

  -t)
    shift
    case $1 in *\ *) usage ;; esac
    case " $os_dltools " in *\ $1\ *) ;; *) usage ;; esac
    tool=$1 ;;

  -u)
    shift; test -n "$1" || usage
    urlid=$1 ;;

  -v)
    q= ;;

  --dryrun)
    dryrun=t ;;

  --trunk)
    trunk=trunk ;;

  --branch)
    shift
    brnch=`echo "$1" | sed -n 's,^\([567]\)\.\([0-9][0-9]*\)$,RELEASE_\1_\2_DRIVEDB,p'`
    test -n "$brnch" || usage ;;

  --cacert)
    shift; test -n "$1" || usage
    cacert=$1 ;;

  --capath)
    shift; test -n "$1" || usage
    capath=$1 ;;

  --insecure)
    insecure=t ;;

  --no-verify)
    no_verify=t ;;

  --export-key)
    expkey=t ;;

  -*)
    usage ;;

  *)
    break ;;
esac; shift; done

if [ -n "$expkey" ]; then
  test $# = 0 || usage
  selectkey "$brnch"
  cat <<EOF
$public_key
EOF
  exit 0
fi

case $# in
  0) DEST=$DRIVEDB ;;
  1) DEST=$1 ;;
  *) usage ;;
esac

selecturl "$urlid"

if [ -z "$tool" ]; then
  # Find download tool in PATH
  for t in $os_dltools; do
    if inpath "$t"; then
      tool=$t
      break
    fi
  done
  test -n "$tool" || error "found none of '$os_dltools' in $pathinfo"
fi

# Check option compatibility
case "$tool:$url" in
  svn:http*://svn.code.sf.net*) ;;
  svn:*) error "'-t svn' requires '-u svn' or '-u svni'" ;;
esac
case "$tool:${capath:+set}" in
  svn:set) warning "'--capath' is ignored if '-t svn' is used" ;;
esac
case "${insecure:-f}:$url" in
  t:http:*) insecure= ;;
  ?:https:*) ;;
  *) error "'-u svni' requires '--insecure'" ;;
esac
case "$tool:$insecure" in
  lynx:t) warning "'--insecure' is ignored if '-t lynx' is used" ;;
esac

# Check for smartctl
if [ "$smtctl" != "-" ]; then
  "$smtctl" -V >/dev/null 2>&1 \
  || err_notfound "$smtctl" "('-s -' to ignore)"
fi

# Check for GnuPG
if [ -z "$no_verify" ]; then
  test -n "$GPG" \
  || error "GnuPG is not available ('--no-verify' to ignore)"
  "$GPG" --version >/dev/null 2>&1 \
  || err_notfound "$GPG" "('--no-verify' to ignore)"
  selectkey "$brnch"
fi

# Use destination directory as temp directory for gpg
tmpdir=`dirname "$DEST"`

# Adjust URLs
src=`echo "$url" | sed -e "s,/trunk/,/branches/$brnch/," \
                       -e "s,/master/,/origin/$brnch/,"`
src_asc=`echo "$src" | sed "s,/drivedb\.h,/drivedb.h.raw.asc,"`
test -z "$trunk" || src=$url

# Download
test -n "$dryrun" || rm -f "$DEST.new" "$DEST.new.raw" "$DEST.new.raw.asc"

vecho "Download ${trunk:-branches/$brnch}/drivedb.h with $tool"
rc=0
download "$src" "$DEST.new" || rc=$?
if [ $rc != 0 ]; then
  rm -f "$DEST.new"
  error "${trunk:-$brnch}/drivedb.h: download failed ($tool: exit $rc)"
fi
if ! errmsg=`check_file "$DEST.new" '/' 10000 1000000`; then
  mv "$DEST.new" "$DEST.error"
  error "$DEST.error: $errmsg"
fi

vecho "Download branches/$brnch/drivedb.h.raw.asc with $tool"
rc=0
download "$src_asc" "$DEST.new.raw.asc" || rc=$?
if [ $rc != 0 ]; then
  rm -f "$DEST.new" "$DEST.new.raw.asc"
  error "$brnch/drivedb.h.raw.asc: download failed ($tool: exit $rc)"
fi
if ! errmsg=`check_file "$DEST.new.raw.asc" '-' 200 2000`; then
  rm -f "$DEST.new"
  mv "$DEST.new.raw.asc" "$DEST.error.raw.asc"
  error "$DEST.error.raw.asc: $errmsg"
fi

test -z "$dryrun" || exit 0

# Create raw file with unexpanded SVN Id
# (This assumes newlines are LF and not CR/LF)
unexpand_svn_id < "$DEST.new" > "$DEST.new.raw"

# Adjust timestamps and permissions
touch "$DEST.new" "$DEST.new.raw" "$DEST.new.raw.asc"
chmod 0644 "$DEST.new" "$DEST.new.raw" "$DEST.new.raw.asc"

if [ -z "$no_verify" ]; then
  # Verify raw file
  if ! gpg_verify "$DEST.new.raw.asc" "$DEST.new.raw"; then
    mv_all "$DEST" ".new" ".error"
    test -n "$trunk" || error "$DEST.error.raw: *** BAD signature or outdated key ***"
    error "$DEST.error.raw: signature from branch no longer valid ('--no-verify' to ignore)"
  fi
fi

if [ "$smtctl" != "-" ]; then
  # Check syntax
  if ! "$smtctl" -B "$DEST.new" -P showall >/dev/null; then
    mv_all "$DEST" ".new" ".error"
    error "$DEST.error: rejected by $smtctl, probably no longer compatible"
  fi
  vecho "$smtctl: syntax OK"
fi

# Keep old file if identical, ignore missing Id keyword expansion in new file
rm -f "$DEST.lastcheck"
if [ -f "$DEST" ]; then
  if [ -f "$DEST.raw" ] && [ -f "$DEST.raw.asc" ]; then
    if    cmp "$DEST.raw"     "$DEST.new.raw"     >/dev/null 2>&1 \
       && cmp "$DEST.raw.asc" "$DEST.new.raw.asc" >/dev/null 2>&1 \
       && {   cmp "$DEST"     "$DEST.new" >/dev/null 2>&1 \
           || cmp "$DEST.raw" "$DEST.new" >/dev/null 2>&1; }
    then
      rm -f "$DEST.new" "$DEST.new.raw" "$DEST.new.raw.asc"
      touch "$DEST.lastcheck"
      echo "$DEST is already up to date"
      exit 0
    fi
    mv_all "$DEST" "" ".old"
  else
    mv "$DEST" "$DEST.old"
  fi
fi

mv_all "$DEST" ".new" ""

echo "$DEST updated from ${trunk:-branches/$brnch}${no_verify:+ (NOT VERIFIED)}"