Download a zip file and deploy a web application via powershell

dep_web_application_code_deployment.ps1

# Powershell 2.0

# Stop and fail script when a command fails.
$errorActionPreference = "Stop"

# load library functions
$rsLibDstDirPath = "$env:rs_sandbox_home\RightScript\lib"
. "$rsLibDstDirPath\tools\PsOutput.ps1"
. "$rsLibDstDirPath\ros\Ros.ps1"
. "$rsLibDstDirPath\tools\Archive.ps1"
. "$rsLibDstDirPath\tools\Checks.ps1"
. "$rsLibDstDirPath\tools\ResolveError.ps1"
. "$rsLibDstDirPath\tools\ExtractReturn.ps1"

try
{
    $site = $env:DOWNLOAD_SITE_NAME.Replace(" ", "")
    # detects if server OS is 64Bit or 32Bit 
    # Details http://msdn.microsoft.com/en-us/library/system.intptr.size.aspx
    
    $s7z_cmd = Join-Path $env:programfiles "7-Zip\7z.exe"
    if (!(Test-Path $s7z_cmd))
    {
    $s7z_cmd = Join-Path ${env:programfiles(x86)} "7-Zip\7z.exe"
    }
    
    # Check inputs
    $zip_url = $env:ZIP_URL
    $StorageConteinerName = $env:REMOTE_STORAGE_CONTAINER_APP
    $StorageType = $env:REMOTE_STORAGE_ACCOUNT_PROVIDER_APP
    $zipName  = $env:ZIP_FILE_NAME
    
    if(!$zip_url -and !$StorageConteinerName) 
    { 
        throw "ERROR: ZIP_URL and REMOTE_STORAGE_CONTAINER_APP not specified." 
    }
    
    # Generate destination path and make sure it doesn't exist
    $dest_path = Join-Path "Z:\$site\release" $(get-date -uformat "%Y%m%d%H%M%S")
    if ($env:RS_IIS_APP_VOLUME)
    {
        $dest_path = Join-Path "${env:RS_IIS_APP_VOLUME}:\release" $(get-date -uformat "%Y%m%d%H%M%S")
    }
        
    # Create dir
    if (Test-Path $dest_path) 
    {
      throw "Directory $dest_path already exists."
    }

    $sleep_delay_sec = 1
    $max_retries = 3
    $retires = 0
    
    # Proceed to download code from zip archive if specified
    if ($zip_url) 
    {
      Write-Host "Creating directory $dest_path"
      if (  !(Test-path "$dest_path"))
      {
           mkdir "$dest_path"
      }
      
      # Download zip
      $web_zip = Join-Path $dest_path "web.zip"
      Write-Host "Downloading $zip_url to $web_zip"
      $web = new-object System.Net.WebClient 
    
      while ($TRUE)
      {
        $web.DownloadFile($zip_url, $web_zip)
        Write-Host "Exit " $?
        if ($?) 
        {
          # success
          break
        }
        else
        {
          # failed try again
          if ($retries -le $max_retries)
          {      
            # sleep a bit before trying again
            Write-Host "Sleeping for $sleep_delay_sec"
            Start-Sleep -s $sleep_delay_sec
            $sleep_delay_sec = $sleep_delay_sec * 2
            $retries = $retries + 1 
          }
          else
          {
            throw "download zip file failed."
          }
        }
      }
    
      cd "$dest_path"
      &"$s7z_cmd" x web.zip -y 
    
      Remove-Item "$web_zip"
    }
    elseif ($zipName)
    {
        Write-Host "Creating directory $dest_path"
        if (  !(Test-path "$dest_path"))
        {
            mkdir "$dest_path"
        }
        
        # Init ROS context (and declare inputs used by InitRosContextFromInputs)
        # $env:REMOTE_STORAGE_ACCOUNT_PROVIDER_APP
        # $env:REMOTE_STORAGE_ACCOUNT_ID_APP
        # $env:REMOTE_STORAGE_ACCOUNT_SECRET_APP
        # $env:REMOTE_STORAGE_CONTAINER_APP
        # $env:REMOTE_STORAGE_BLOCK_SIZE_APP
        # $env:REMOTE_STORAGE_THREAD_COUNT_APP
        # $env:OBJECT_STORAGE_SERVICENET_APP
        # $env:REMOTE_STORAGE_ENDPOINT_URL_APP
        if ($env:REMOTE_STORAGE_ACCOUNT_PROVIDER_APP -eq 'OpenStack_Swift')
        {
            CheckInputNotEmpty 'REMOTE_STORAGE_ENDPOINT_URL_APP'
        }
        $rosCtx = InitRosContextFromInputsApp | ExtractReturn

        $fullPath = Join-Path $dest_path $zipName
        RosGetObject $rosCtx $zipName $fullPath

        Write-Host "Unzipping ${fullPath}..."
        cd "$dest_path"
        &"$s7z_cmd" x "$zipName" -y 

       # Write-Host "Removing ${fullPath}..."
       # Remove-Item $fullPath
    }
    else
    {
        throw "Location of the application code is not specified. Please check the inputs and try again."
    }
    
    $deploy_path = "C:\inetpub"
    
    if (Test-path $deploy_path\$env:WEB_SITE_NAME)
    {
        #Remove previous deployment if it exists.
        Remove-Item $deploy_path\$env:WEB_SITE_NAME -recurse -force
        Write-Host "Application code removed successfully"
    }
    else
    {
      Write-Host "$deploy_path\$env:WEB_SITE_NAME does not exist. Continuing on."
    }
    
    #Move newly downloaded published sites into place
    mv $dest_path\_PublishedWebsites\$env:WEB_SITE_NAME $deploy_path
    Write-Host "Application code moved succssfully to $deploy_path"
      
    # Set RS_IIS_LAST_RELEASE environment variable 
    Write-Host "Setting RS_IIS_LAST_RELEASE environment variable to '$deploy_path\$env:WEB_SITE_NAME'..."
    [environment]::SetEnvironmentVariable("RS_IIS_LAST_RELEASE", "$deploy_path\$env:WEB_SITE_NAME", "Machine")
    
    Write-Host "Application code downloaded succssfully to '$dest_path'"
}
catch
{
    ResolveError
    exit 1
}