Install-ContainerHost.ps1 may fail in Wait-InstalledContainerImage

[mikejhill]

On line 1032, $timeElapsed = $(Get-Date) - $startTime may throw an exception when the constraint $newBaseImages.count -neq 0 is not immediately satisfied. This is caused by $startTime not being assigned.

We were able to work around this issue by making the following modification on line 1028:

  $newBaseImages = Get-InstalledContainerImage $BaseImageName
+ $startTime = Get-Date
  while ($newBaseImages.Count -eq 0)

Original encountered exception:

C:\Install-ContainerHost.ps1 : Cannot find an overload for "op_Subtraction" and the argument count: "2".
At line:1 char:1
+ C:\Install-ContainerHost.ps1 -PSDirect -NATSubnetPrefix 172.16.0.0/24 ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [Write-Error], WriteErrorException
    + FullyQualifiedErrorId : Microsoft.PowerShell.Commands.WriteErrorException,Install-ContainerHost.ps1

[mebersol]

Fixed with 27c5563