Chromium_Updater.ps1

# ---------------------------------------------------------------------------------
# Chromium Updater v.1.0
# By Mikhail Tsennykh, 2012 (http://www.codeproject.com/Members/Mikhail-T)
# ---------------------------------------------------------------------------------

# Pre-run actions
cls; ""; "Welcome to Chromium Updater!"; "v.1.0"; ""


# Load update settings
$config = [xml](get-content Chromium_Updater_Settings.xml -ErrorAction SilentlyContinue) 
if ($config -eq $null) { 
  ""; "Chromium_Updater_Settings.xml file is not found! It should reside in the same directory as main script."
  Start-Sleep -s 5; exit 
}
$chromium_archive_name = $config.settings.archive_name
$chromium_archive_ext  = $config.settings.archive_ext
$download_path = $env:USERPROFILE + "\"
if ($config.settings.download_path) { $download_path = $config.settings.download_path }
$install_path = $config.settings.install_path + "\"                            


# Set local variables
$source_archive_path = $download_path + $chromium_archive_name + $chromium_archive_ext
$old_version_path = $install_path + $chromium_archive_name          # Chromium installation directory


# Download source archive (while deleting any previous copies)
if (Test-Path $source_archive_path) { Remove-Item -Recurse -Force $source_archive_path }
if ((Test-Path $source_archive_path) -eq $false) {
  # Get latest version of Chromium (continuous build)
  ""; "Checking for the latest Chromium build..."; ""
  
  $web = New-Object System.Net.WebClient
  $latest_version = $web.DownloadString("http://commondatastorage.googleapis.com/chromium-browser-continuous/Win/LAST_CHANGE")
  
  # If latest version is not null, download archive  
  if ($latest_version) {
    ""; "Continuous build " + $latest_version + " is being downloaded..."; ""
    
    $url = "http://commondatastorage.googleapis.com/chromium-browser-continuous/Win/" + $latest_version + "/chrome-win32.zip"
    $web.DownloadFile($url, $source_archive_path);

    # If download complete, start update
    ""; "Download complete! Proceeding..."; ""
    Start-Sleep -s 1    
  } 
}


# If source archive exists, proceed to update
if (Test-Path $source_archive_path) {
  $chromium_was_open = $false  # will be used to restart Chromium, if it was open before update
  # Close any open chrome windows first (use: 'Get-Process chrome' to show process details)
  if (Get-Process chrome -ErrorAction SilentlyContinue) {
    # Message
    ""; "Chromium will be closed for the update and will restart after update is done."; "" 
    $attempts = 10
    do {
    
      # Try to safely close Chromium
      Get-Process chrome | % { $_.CloseMainWindow() | out-null }
      # Remember if Chromium was open before update
      $chromium_was_open = $true  
      # Wait for some time so that Chromium will close correctly
    
      Start-Sleep -s 1
      $attempts = $attempts - 1
    }
    until ((Get-Process chrome -ErrorAction SilentlyContinue) -eq $null -Or $attempts -eq 0)
  }

  # If all Chromium windows are closed
  if ((Get-Process chrome -ErrorAction SilentlyContinue) -eq $null) {
    # Remove old version of Chromium, if it exists
    $new_install = $false
    if (Test-Path $old_version_path) {
      ""; "Chromium is being updated now. Please wait..."; ""    
      Remove-Item -Recurse -Force $old_version_path
    } else {
      $new_install = $true
      ""; "Chromium is being installed to:";
      $old_version_path; ""; "Please wait..."
    }
    
    # If installation directory is not present, create it
    if ((Test-Path $install_path) -eq $false) {
      New-Item $install_path -type directory
    }
    
    # Unpack zip archive
    $zip_file_path = $source_archive_path
    $unzip_path = $install_path
    
    if (Test-Path $zip_file_path) { 
      [System.Int32]$yestoall = "16"
      [System.Int32]$progressbar = "4"
      $shellApplication = New-Object -com shell.application 
      $zipPackage = $shellApplication.NameSpace($zip_file_path) 
      $destinationFolder = $shellApplication.NameSpace($unzip_path) 
      $destinationFolder.CopyHere($zipPackage.Items(), $progressbar) 
    }  
  
    # Delete source archive:
    Remove-Item -Recurse -Force $source_archive_path
    
    # Start updated Chromium if it was previously open
    if ($chromium_was_open -eq $true -And (Test-Path $old_version_path)) {
      # Success message
      ""; "Success! Chromium will restart in a moment!"; "(this window will close automatically)"
      cd $old_version_path; ./chrome.exe
    } else {
      # Success message
      ""; "Success! Enjoy your Chromium!"; "(this window will close automatically)"     
    }
    
    # If new installation...
    if ($new_install) {
      # Create Desktop shortcut
      $wshshell = New-Object -ComObject WScript.Shell
      $lnk = $wshshell.CreateShortcut("$env:USERPROFILE\Desktop\Chromium.lnk")
      $lnk.TargetPath = "$old_version_path\chrome.exe"
      $lnk.WorkingDirectory = "$old_version_path"
      $lnk.Save()      
    }
    
  } else {
    # If Chromium is still running, show message
    ""; "Chromium cannot be closed and/or it needs your attention..."
  }
}

# Wait for some time, before PowerShell window will automatically close
Start-Sleep -s 3