{
  "variables": {
    "client_id": "{{env `ARM_CLIENT_ID`}}",
    "client_secret": "{{env `ARM_CLIENT_SECRET`}}",
    "resource_group": "{{env `ARM_RESOURCE_GROUP`}}",
    "storage_account": "{{env `ARM_STORAGE_ACCOUNT`}}",
    "subscription_id": "{{env `ARM_SUBSCRIPTION_ID`}}",
    "object_id": "{{env `ARM_OJBECT_ID`}}"
  },
  "builders": [
    {
      "type": "azure-arm",
        
      "client_id": "{{user `client_id`}}",
      "client_secret": "{{user `client_secret`}}",
      "resource_group_name": "{{user `resource_group`}}",
      "storage_account": "{{user `storage_account`}}",
      "subscription_id": "{{user `subscription_id`}}",
      "object_id": "{{user `object_id`}}",

      "capture_container_name": "images",
      "capture_name_prefix": "packer",

      "os_type": "Windows",
      "image_url": "https://my-storage-account.blob.core.windows.net/path/to/your/custom/image.vhd",

      "azure_tags": {
        "dept": "engineering",
        "task": "image deployment"
      },

      "location": "West US",
      "vm_size": "Standard_DS2_v2"
    }
  ],
  "provisioners": [{
    "type": "powershell",
      "inline": [
        " # NOTE: the following *3* lines are only needed if the you have installed the Guest Agent.",
        "  while ((Get-Service RdAgent).Status -ne 'Running') { Start-Sleep -s 5 }",
        "  while ((Get-Service WindowsAzureTelemetryService).Status -ne 'Running') { Start-Sleep -s 5 }",
        "  while ((Get-Service WindowsAzureGuestAgent).Status -ne 'Running') { Start-Sleep -s 5 }",

        "if( Test-Path $Env:SystemRoot\\windows\\system32\\Sysprep\\unattend.xml ){ rm $Env:SystemRoot\\windows\\system32\\Sysprep\\unattend.xml -Force}",
        "& $env:SystemRoot\\System32\\Sysprep\\Sysprep.exe /oobe /generalize /quiet /quit",
        "while($true) { $imageState = Get-ItemProperty HKLM:\\SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Setup\\State | Select ImageState; if($imageState.ImageState -ne 'IMAGE_STATE_GENERALIZE_RESEAL_TO_OOBE') { Write-Output $imageState.ImageState; Start-Sleep -s 10  } else { break } }"
    ]
  }]
}