#
# smartmontools drive database update script for Windows
#
# Home page of code is: https://www.smartmontools.org
#
# Copyright (C) 2022-23 Christian Franke
#
# SPDX-License-Identifier: GPL-2.0-or-later
#
# $Id: update-smart-drivedb.ps1.in 5515 2023-07-24 12:58:25Z chrfranke $
#

<#
  .SYNOPSIS
  Update smartmontools @VERSION@ drive database.

  .DESCRIPTION
  update-smart-drivedb.ps1 updates SCRIPTDIR/drivedb.h from
  branches/@DRIVEDB_BRANCH@ of smartmontools SVN repository.

  The downloaded file is verified with OpenPGP/GPG key ID 721042C5.
  The public key block is included in the script.

  .PARAMETER Smartctl
  Use this smartctl executable for syntax check ('-Smartctl -' to
  disable).  The default is smartctl.exe in script directory.

  .PARAMETER UrlOf
  Use the URL of one of the following locations for download:
    github (GitHub mirror of SVN repository)
    sf (Sourceforge code browser)
    svn (SVN repository)
    svni (SVN repository via HTTP instead of HTTPS)
    trac (Trac code browser)
  The default is 'svn'.

  .PARAMETER Url
  Download from this URL.  A valid OpenPGP/GPG signature with '.raw.asc'
  extension must also exist unless '-NoVerify' is also specified.

  .PARAMETER File
  Copy from local file.  A valid OpenPGP/GPG signature 'FILE.raw.asc'
  must also exist unless '-NoVerify' is also specified.

  .PARAMETER Trunk
  Download from SVN trunk.  This requires '-NoVerify' because the trunk
  versions are not signed.

  .PARAMETER Branch
  If '-Branch X.Y' is specified, download from
  branches/RELEASE_X_Y_DRIVEDB.  This also selects the OpenPGP/GPG key
  for older branches (5.40 to 6.6: Key ID DFD22559).

  .PARAMETER Insecure
  Don't abort download if certificate verification fails.  This option
  is also required if a HTTP URL is selected with '-UrlOf' option.
  If a HTTPS URL is selected, PowerShell >= 6.0 is required.

  .PARAMETER NoVerify
  Don't verify signature with GnuPG.

  .PARAMETER Force
  Allow downgrades.  By default, the database is not replaced with an
  older version of the same branch.

  .PARAMETER ExportKey
  Print the OpenPGP/GPG public key block.

  .PARAMETER DryRun
  Print download commands only.

  .PARAMETER Quiet
  Suppress info messages.

  .PARAMETER Drivedb
  Destination drive database file.
  The default is drivedb.h in script directory.

  .EXAMPLE
  update-smart-drivedb.ps1
  /INSTALLPATH/drivedb.h 7.2/5225 updated to 7.2/5237

  (Regular update)

  .EXAMPLE
  update-smart-drivedb.ps1 -Force -File /INSTALLPATH/drivedb.h.old
  /INSTALLPATH/drivedb.h 7.2/5237 downgraded to 7.2/5225

  (Revert to previous version)

  .EXAMPLE
  update-smart-drivedb -Trunk -NoVerify -Smartctl - drivedb-trunk.h
  drivedb-trunk.h 7.3/5254 newly installed (NOT VERIFIED)

  (Download the database from SVN trunk to current directory)

  .LINK
  https://www.smartmontools.org/
#>

param (
  [string]$Smartctl,
  [string]$UrlOf,
  [string]$Url,
  [string]$File,
  [switch]$Trunk,
  [string]$Branch,
  [switch]$Insecure,
  [switch]$NoVerify,
  [switch]$Force,
  [switch]$ExportKey,
  [switch]$DryRun,
  [switch]$Quiet,
 #[switch]$Verbose, # Common parameter
  [Parameter(Position=0)][string]$Drivedb
)

$ErrorActionPreference = "Stop"

# Set by config.status
# Default drivedb.h update branch
$default_branch="@DRIVEDB_BRANCH@"

# GnuPG used to verify signature (disabled if empty)
$gpg = "@gnupg@"

# Name and Directory of this script
$myname = $MyInvocation.MyCommand.Name
$mydir = Split-Path -Path $MyInvocation.MyCommand.Source
if (!$mydir) {
  throw "Unknown script directory"
}

# Default drivedb location
$default_drivedb = "$mydir\drivedb.h"

# Default command used for syntax check
$default_smartctl = "$mydir\smartctl"

function error($message)
{
  # Echo error messages to stdout because 'Write-Error'
  # always writes a full 'ErrorRecord' to stderr.
  echo "${myname}: $message"
  exit 1
}

function warning($message)
{
  echo "${myname}: (Warning) $message"
}

function iecho($message)
{
  if (!$script:Quiet) {
    echo $message
  }
}

function vecho($message)
{
  $message | Write-Verbose
}

function test_f($file)
{
  return Test-Path -PathType Leaf -LiteralPath $file
}

function touch($file)
{
  if (Test-Path -PathType Leaf -LiteralPath $file) {
    (Get-Item $file).LastWriteTime = Get-Date
  } else {
    New-Item -ItemType File -Path $file | Out-Null
  }
}

function cmp($file1, $file2)
{
  if (!(     (Test-Path -PathType Leaf -LiteralPath $file1) `
        -and (Test-Path -PathType Leaf -LiteralPath $file2))) {
    return $false
  }
  return (Get-FileHash $file1).hash -eq (Get-FileHash $file2).hash
}

function rm_f # FILE...
{
  foreach ($file in $args) {
    if (Test-Path -PathType Leaf -LiteralPath $file) {
      Remove-Item $file
    }
  }
}

function rm_rf($dir)
{
  if (Test-Path -PathType Container -LiteralPath $dir) {
    Remove-Item -Recurse $dir
  }
}

function mv_f($oldfile, $newfile)
{
  rm_f $newfile
  Rename-Item $oldfile $newfile
}

function selecturl($url_of, [ref]$url)
{
  switch ($url_of) {
    'github' {
       #    https://github.com/smartmontools/smartmontools/raw/origin/$branch/smartmontools/drivedb.h
       #    https://github.com/smartmontools/smartmontools/raw/master/smartmontools/drivedb.h
       #    redirected to:
       $u = 'https://raw.githubusercontent.com/smartmontools/smartmontools/master/smartmontools/drivedb.h'
     }
    'sf'   { $u = 'https://sourceforge.net/p/smartmontools/code/HEAD/tree/trunk/smartmontools/drivedb.h?format=raw' }
    'svn'  { $u = 'https://svn.code.sf.net/p/smartmontools/code/trunk/smartmontools/drivedb.h' }
    'svni' { $u = 'http://svn.code.sf.net/p/smartmontools/code/trunk/smartmontools/drivedb.h' }
    'trac' { $u = 'https://www.smartmontools.org/export/HEAD/trunk/smartmontools/drivedb.h' }
    default { error "${url_of}: is none of 'github sf svn svni trac'" }
  }
  $url.Value = $u
}

function vcopy($src, $dest)
{
  if ($script:DryRun) {
    echo "Copy-Item $src $dest"
  } else {
    vecho "Copy-Item $src $dest"
    Copy-Item $src $dest
  }
}

function download($url, $file, [ref]$errmsg)
{
  $req = @{ Uri = $url; OutFile = $file; MaximumRedirection = 0 }
  if ($script:Insecure) {
    # #Requires -Version 6
    $req += @{ SkipCertificateCheck = $true }
  }

  $errmsg.Value = ""
  if ($script:DryRun) {
    echo "Invoke-WebRequest $(echo @req)"
  } else {
    try {
      Invoke-WebRequest @req
    } catch {
      if ($_.Exception.Message) {
        $errmsg.Value = $_.Exception.Message
      } else {
        $errmsg.Value = "Unknown error"
      }
    }
  }
}

function check_file($file, $firstchar, $minsize, $maxsize)
{
  # Check file size
  $size = (Get-Item -LiteralPath $file).Length
  if ($size -lt $minsize) {
    return "too small file size $size bytes"
  }
  if ($size -gt $maxsize) {
    return "too large file size $size bytes"
  }

  # Check first chars
  switch ((Get-Content -LiteralPath $file -TotalCount 1).ToCharArray()[0]) {
    "$firstchar" { }
    "<" { return "HTML error message" }
    default { return "unknown file contents" }
  }

  return ""
}

function unexpand_svn_id($source, $dest)
{
  # For -NoNewLine:
  #Requires -Version 5
  (Get-Content -Raw -Path $source) -replace `
    ('\$'+'Id: drivedb\.h [0-9][0-9]* 2[-0-9]* [012][:0-9]*Z [a-z][a-z0-9]* \$'),('$'+'Id'+'$') `
  | Set-Content -NoNewLine -Path $dest
}

function selectkey($branch, [ref]$key)
{
  switch -RegEx ($branch) {
    '^RELEASE_(5_4[0-3]|6_[0-6])_DRIVEDB$' {
# 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
      $key.Value = `
'-----BEGIN PGP PUBLIC KEY BLOCK-----

mQENBFgOYoEBCAC93841SlFmpp6640hKUvZ8PbZR6OGnZnMXD6QRVzpibXGZXUDB
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=3Lcg
-----END PGP PUBLIC KEY BLOCK-----
'
    }

    '^RELEASE_7_[023]_DRIVEDB$' {
# Smartmontools Signing Key (through 2025) <smartmontools-database@listi.jpberlin.de>
# Smartmontools Signing Key (through 2020) <smartmontools-database@listi.jpberlin.de>
# Key ID 721042C5
      $key.Value = `
'-----BEGIN PGP PUBLIC KEY BLOCK-----

mQINBFwmhpUBEADRoOZaXq13MrqyAmbGe6FlHi6P9ujsT/SJGhTiAoN3W1X56Dbm
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=7MQk
-----END PGP PUBLIC KEY BLOCK-----
'
    }

    default {
      error "No known public key for branches/${branch}"
    }
  }
}

function run_join_out_err($cmd) # $arg1, $arg2, ...
{
  $cmdobj = Get-Command -CommandType Application -Name $cmd
  # Don't prepend $input with BOM
  $enc = [Console]::InputEncoding
  [Console]::InputEncoding = [System.Text.UTF8Encoding]::new()
  $ErrorActionPreference = "Continue" # Don't abort command on first stderr output
  $LASTEXITCODE = 42
  # Run command and convert ErrorRecords from stderr to plain Strings
  $($input | & $cmdobj @args 2>&1) | %{ $_.ToString() }
  $ErrorActionPreference = "Stop"
  [Console]::InputEncoding = $enc
}

function gpg_verify($ascfile, $file, [ref]$ok)
{
  # Create temp home dir
  if (!$env:TEMP) { error "Environment variable TEMP is not set" }
  $gnupgtmp = Join-Path $env:TEMP "gnupg.$(New-Guid)"
  rm_rf $gnupgtmp
  New-Item -Type Directory -Path $gnupgtmp | Out-Null

  # Import public key
  $env:LC_MESSAGES = "C"
  $out = ($public_key | run_join_out_err $gpg "--batch" "--no-tty" "--homedir=$gnupgtmp" "--import")
  if ($LASTEXITCODE -ne 0) {
    echo $out
    exit 1
  }
  vecho $out

  # Verify
  $out = run_join_out_err $gpg "--batch" "--no-tty" "--homedir=$gnupgtmp" "--verify" $ascfile $file
  if ($LASTEXITCODE -eq 0) {
    vecho $out
    $ok.Value = $true
  }
  else {
    # print gpg error always
    echo $out
    $ok.Value = $false
  }

  # Stop the gpg-agent possibly started by gpg
  if ($gpgconf) {
    $out = run_join_out_err $gpgconf "--homedir=$gnupgtmp" "--kill" "gpg-agent"
    if ($LASTEXITCODE -ne 0) {
      echo $out
    }
  }

  # Remove temp home dir
  try {
    rm_rf "$gnupgtmp"
  } catch {
    warning "$_"
  }
}

function get_db_version($file)
{
  $x = (Select-String -CaseSensitive -Pattern '^[ {]*"VERSION: *[^"]*"' -Path $file).Line `
       -replace '^[ {]*"VERSION: ([1-9][./0-9]* [^"]*)".*$','$1'
  $v = $x -replace ' .*$',''
  if ($v -match '^[1-9][.0-9]*$') { # trunk: get rev from expanded SVN-Id
    $r = $x -replace '^[^$]*\$Id: drivedb\.h ([1-9][0-9]*) .*$','$1'
    if (!($r -match '^[1-9][0-9]*$')) {
      $r = "?"
    }
    $v = "$v/$r"
  } elseif (!($v -match '^[1-9][./0-9]*$')) {
    return ""
  }
  return $v
}

function mv_all($prefix, $old, $new)
{
  mv_f "${prefix}${old}" "${prefix}${new}"
  mv_f "${prefix}${old}.raw" "${prefix}${new}.raw"
  if (test_f "${prefix}${old}.raw.asc") {
    mv_f "${prefix}${old}.raw.asc" "${prefix}${new}.raw.asc"
  } else {
    rm_f "${prefix}${new}.raw.asc"
  }
}

# Set defaults
if (!$Smartctl) {
  $Smartctl = $default_smartctl
}

if ($Branch) {
  $brname = $Branch -replace '^([567])\.([0-9][0-9]*)$','RELEASE_$1_$2_DRIVEDB'
  if ($brname -eq $Branch) {
    error "invalid branch version '${Branch}'"
  }
} else {
  $brname = $default_branch
}

if (!$Drivedb) {
  $Drivedb = $default_drivedb
}

if ($ExportKey) {
  $key = ""
  selectkey $brname ([ref]$key)
  echo $key
  exit 0
}

# Check selected source
if (!$Url -and !$File) {
  if (!$UrlOf) {
    $UrlOf = "svn"
  }
  $Url = ""
  selecturl $UrlOf ([ref]$Url)
  if (!$Trunk) {
    $Url = $Url -replace "/trunk/","/branches/$brname/"
    $Url = $Url -replace "/master/","/origin/$brname/"
  } elseif (!$NoVerify) {
    error "'-Trunk' requires '-NoVerify'"
  }
} elseif (!$UrlOf -and $Url -and !$File) {
  if (!($Url -match '^[a-z][a-z0-9]*:[^ ][^ ]*$')) {
    error "${Url}: Invalid URL"
  }
} elseif (!$UrlOf -and !$Url -and $File) {
} else {
  error "only one of '-UrlOf', '-Url', '-File' is allowed"
}

# Determine path of signature file
$FileAsc = ""
$UrlAsc = ""
if (!$NoVerify) {
  if (!$Url) {
    $FileAsc = "${File}.raw.asc"
  } elseif ($Url -match '\?') {
    $UrlAsc = $Url -replace '\?','.raw.asc?'
  } else {
    $UrlAsc = "${Url}.raw.asc"
  }
}

# Check option compatibility
if ($UrlOf -eq "svni") {
  if ($Insecure) {
    $Insecure = $false
  }
  else {
    error "'-UrlOf svni' requires '-Insecure'"
  }
}

# Check for smartctl
if ($Smartctl -ne "-") {
  if (!(Get-Command -Type Application -Name $Smartctl -ErrorAction Ignore)) {
    error "${Smartctl}: not found ('-Smartctl -' to ignore)"
  }
}

# Check for GnuPG
$gpgconf = ""
if (!$NoVerify) {
  $gpgobj = $null
  if ($gpg) {
    $gpgobj = Get-Command -Type Application -Name $gpg -ErrorAction Ignore
  }
  if (!$gpgobj) {
    error "GnuPG is not available ('-NoVerify' to ignore)"
  }
  $public_key = ""
  selectkey $brname ([ref]$public_key)
  # Check for gpgconf in same directory
  $gpgconf = "gpgconf"
  $gpgconfobj = Get-Command -Type Application -Name $gpgconf -ErrorAction Ignore;
  if (!($gpgconfobj -and ((Split-Path $gpgobj.Source) -eq (Split-Path $gpgconfobj.Source)))) {
    $gpgconf = ""
  }
}

# Remove possible garbage from last download
if (!$DryRun) {
  rm_f "${Drivedb}.new" "${Drivedb}.new.raw" "${Drivedb}.new.raw.asc"
}

if ($Url) {
  # Download
  vecho "Download drivedb.h"
  $errmsg = ""
  download $Url "${Drivedb}.new" ([ref]$errmsg)
  if ($errmsg) {
    rm_f "${Drivedb}.new"
    error "drivedb.h: download failed: $errmsg"
  }

  if ($UrlAsc) {
    vecho "Download drivedb.h.raw.asc"
    download $UrlAsc "${Drivedb}.new.raw.asc" ([ref]$errmsg)
    if ($errmsg) {
      rm_f "${Drivedb}.new" "${Drivedb}.new.raw.asc"
      error "drivedb.h.raw.asc: download failed: $errmsg ('-NoVerify' to ignore)"
    }
  }
} else {
  # Copy from local file
  if (!(test_f $File)) {
    error "${File}: file not found"
  }
  if ($FileAsc -and !(test_f $FileAsc)) {
    error "${FileAsc}: file not found ('-NoVerify' to ignore)"
  }

  vcopy $File "${Drivedb}.new"
  if ($FileAsc) {
    vcopy $FileAsc "${Drivedb}.new.raw.asc"
  }
}

if ($DryRun) {
  exit 0
}

# Check files and adjust timestamps
$errmsg = check_file "${Drivedb}.new" '/' 10000 1000000
if ($errmsg) {
  rm_f "${Drivedb}.new.raw.asc"
  mv_f "${Drivedb}.new" "${Drivedb}.error"
  error "${Drivedb}.error: $errmsg"
}
touch "${Drivedb}.new"

if (test_f "${Drivedb}.new.raw.asc") {
  $errmsg = check_file "${Drivedb}.new.raw.asc" '-' 200 2000
  if ($errmsg) {
    rm_f "${Drivedb}.new"
    mv_f "${Drivedb}.new.raw.asc" "${Drivedb}.error.raw.asc"
    error "${Drivedb}.error.raw.asc: $errmsg"
  }
  touch "${Drivedb}.new.raw.asc"
}

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

# Check whether installed file is identical
$equal = $false
if (test_f $Drivedb) {
  if (!(test_f "${Drivedb}.raw")) {
    # Create missing raw file
    unexpand_svn_id "${Drivedb}" "${Drivedb}.raw"
  }
  # Ignore missing Id keyword expansion in new file
  if (      (cmp "${Drivedb}.raw" "${Drivedb}.new.raw") `
      -and (    (cmp "${Drivedb}"     "${Drivedb}.new") `
            -or (cmp "${Drivedb}.raw" "${Drivedb}.new"))) {
    $equal = $true
  }
}

if (!$NoVerify) {
  # Verify raw file
  $ok = $false
  gpg_verify "${Drivedb}.new.raw.asc" "${Drivedb}.new.raw" ([ref]$ok)
  if (!$ok) {
    mv_all $Drivedb ".new" ".error"
    if ($equal) {
      warning "${Drivedb}: *** installed file is identical to broken new file ***"
    }
    error "${Drivedb}.error.raw: *** BAD signature or outdated key ***"
  }
}

# Get version
$newver = get_db_version "${Drivedb}.new"
if (!$newver) {
  if (!$Force) {
    mv_all $Drivedb ".new" ".error"
    error "${Drivedb}.error: no VERSION information found ('-Force' to ignore)"
  }
  $newver = "?/?"
} elseif ($newver -match '/\?$') {
  if (!$Trunk) {
    mv_all $Drivedb ".new" ".error"
    error "${Drivedb}.error: VERSION information is incomplete ('-Trunk' to ignore)"
  }
}

if ($Smartctl -ne "-") {
  # Check syntax
  run_join_out_err $Smartctl -B "${Drivedb}.new" -P showall | Out-Null
  if (!$?) {
    mv_all $Drivedb ".new" ".error"
    error "${Drivedb}.error: rejected by $Smartctl, probably no longer compatible"
  }
  vecho "${Smartctl}: syntax OK"
}

# Always install if missing
rm_f "${Drivedb}.lastcheck"
if (!(Test-Path -PathType Leaf -Path $Drivedb)) {
  mv_all $Drivedb ".new" ""
  iecho "$Drivedb $newver newly installed$(if ($NoVerify) {" (NOT VERIFIED)"})"
  exit 0
}

# Keep old file if identical
if ($equal) {
  if (test_f "${Drivedb}.new.raw.asc") {
    if (!(cmp "${Drivedb}.new.raw.asc" "${Drivedb}.raw.asc")) {
      mv_f "${Drivedb}.new.raw.asc" "${Drivedb}.raw.asc"
      iecho "${Drivedb}.raw.asc $newver updated"
    }
  }
  rm_f "${Drivedb}.new" "${Drivedb}.new.raw" "${Drivedb}.new.raw.asc"
  touch "${Drivedb}.lastcheck"
  iecho "$Drivedb $newver is already up to date$(if ($NoVerify) {" (NOT VERIFIED)"})"
  exit 0
}

# Check branch and file version
$oldver = $(get_db_version "${Drivedb}")
if (!$oldver) {
  $oldver = "?/?"
}

if (    ($newver -match '/\?$') `
    -or ($oldver -match '/\?$') `
    -or (($newver -replace '/.*$','') -ne ($oldver -replace '/.*$',''))) {
  # Always install from trunk or other branch
  $updmsg = "replaced with"
} elseif ((($newver -replace '^.*/','') - ($oldver -replace '^.*/','')) -lt 0) {
  # Install older file only if '-Force' is used
  if (!$Force) {
    rm_f "${Drivedb}.new" "${Drivedb}.new.raw" "${Drivedb}.new.raw.asc"
    iecho "$Drivedb $oldver not downgraded to $newver ('-Force' to override)"
    exit 0
  }
  $updmsg = "downgraded to"
} else {
  $updmsg = "updated to"
}

mv_all $Drivedb "" ".old"
mv_all $Drivedb ".new" ""
iecho "$Drivedb $oldver $updmsg $newver$(if ($NoVerify) {" (NOT VERIFIED)"})"
exit 0