Resolve-DscConfigurationProperty update

Resolve-DscConfigurationPropertyUpdate.ps1

$ConfigurationData = @{
    AllNodes = @(
        @{
            NodeName = 'Server01'
            Applications = @{
                Mercurial = @{
                    Name = 'Mercurial 2.5.1 (x64)'
                    ProductId = 'F39802E0-BE92-4896-A67B-85144CF01831'
                    SourcePath = '\\servername\sharename\Mercurial\'
                    Installer = 'mercurial-2.5.1-x64.msi'
                }
            }
        }
    )
}

configuration Before
{
    node $AllNodes.NodeName
    {
        $mercurial = Resolve-DscConfigurationProperty -Node $node -Application Mercurial

        Package mercurial
        {
            Ensure = 'Present'
            Name = $mercurial['Name']
            ProductId = $mercurial['ProductId']
            Path = Join-Path $mercurial['SourcePath'] $mercurial['Installer']
        }
    }
}

configuration After
{
    node $AllNodes.NodeName
    {
        $sourcePath = Resolve-DscConfigurationProperty -Node $node -PropertyName Applications\Mercurial\SourcePath
        $installer  = Resolve-DscConfigurationProperty -Node $node -PropertyName Applications\Mercurial\Installer

        Package mercurial
        {
            Ensure = 'Present'
            Name = Resolve-DscConfigurationProperty -Node $node -PropertyName Applications\Mercurial\Name
            ProductId = Resolve-DscConfigurationProperty -Node $node -PropertyName Applications\Mercurial\ProductId
            Path = Join-Path $sourcePath $installer
        }
    }
}