Lability

0.15.0

Src/Private/Resolve-NodePropertyValue.ps1

                                function Resolve-NodePropertyValue {

<#

    .SYNOPSIS

        Resolves a node's properites.

    .DESCRIPTION

        Resolves a lab virtual machine properties from the lab defaults, Node\* node

        and Node\NodeName node.

        Properties defined on the wildcard node override the lab defaults.

        Properties defined at the node override the wildcard node settings.

#>

    [CmdletBinding()]

    [OutputType([System.Collections.Hashtable])]

    param (

        ## Lab VM/Node name

        [Parameter(Mandatory, ValueFromPipeline)]

        [System.String] $NodeName,

        ## Specifies a PowerShell DSC configuration document (.psd1) containing the lab configuration.

        [Parameter(Mandatory, ValueFromPipelineByPropertyName)]

        [System.Collections.Hashtable]

        [Microsoft.PowerShell.DesiredStateConfiguration.ArgumentToConfigurationDataTransformationAttribute()]

        $ConfigurationData,

        ## Do not enumerate the AllNodes.'*' node

        [Parameter(ValueFromPipelineByPropertyName)]

        [System.Management.Automation.SwitchParameter] $NoEnumerateWildcardNode

    )

    process {

        $node = @{ };

        if (-not $NoEnumerateWildcardNode) {

            ## Retrieve the AllNodes.* properties

            $ConfigurationData.AllNodes.Where({ $_.NodeName -eq '*' }) | ForEach-Object {

                foreach ($key in $_.Keys) {

                    $node[$key] = $_.$key;

                }

            }

        }

        ## Retrieve the AllNodes.$NodeName properties

        $ConfigurationData.AllNodes.Where({ $_.NodeName -eq $NodeName }) | ForEach-Object {

            foreach ($key in $_.Keys) {

                $node[$key] = $_.$key;

            }

        }

        ## Check VM defaults

        $labDefaultProperties = Get-ConfigurationData -Configuration VM;

        $properties = Get-Member -InputObject $labDefaultProperties -MemberType NoteProperty;

        foreach ($propertyName in $properties.Name) {

            ## Int32 values of 0 get coerced into $false!

            if (($node.$propertyName -isnot [System.Int32]) -and (-not $node.ContainsKey($propertyName))) {

                $node[$propertyName] = $labDefaultProperties.$propertyName;

            }

        }

        $moduleName = $labDefaults.ModuleName;

        $resolveLabEnvironmentNameParams = @{

            Name              = $NodeName;

            ConfigurationData = $ConfigurationData;

        }

        ## Set the node's friendly/display name with any prefix/suffix

        $node["$($moduleName)_NodeDisplayName"] = Resolve-LabEnvironmentName @resolveLabEnvironmentNameParams;

        ## Rename/overwrite existing parameter values where $moduleName-specific parameters exist

        foreach ($key in @($node.Keys)) {

            if ($key.StartsWith("$($moduleName)_")) {

                $node[($key.Replace("$($moduleName)_",''))] = $node.$key;

                $node.Remove($key);

            }

        }

        return $node;

    } #end process

} #end function ResolveLabVMProperties

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