一部抜き出し

TargetResource.ps1

function Get-TargetResource
{
    [CmdletBinding()]
    [OutputType([System.Collections.Hashtable])]
    param
    (
        [parameter(Mandatory = $true)]
        [System.String]$Path,

        [parameter(Mandatory = $true)]
        [System.String]$ServiceName,

        [parameter(Mandatory = $true)]
        [ValidateSet("Present","Absent")]
        [System.String]$Ensure
    )
    
    # validate path is correct.
    ValidatePathExists -Path $Path

    # Check existing is TopShelfService or not
    if (-not (IsServiceExists -Name $ServiceName))
    {
        Write-Debug $debugMessages.ServiceNotExists
        $ensureResult = [EnsureType]::Absent.ToString()
    }
    else
    {
        # service exist. Validate if it is TopShelf Service or not
        if (IsTopShelfService -Name $ServiceName -Path $Path)
        {
            $ensureResult = [EnsureType]::Present.ToString()
        }
        else
        {
            $ensureResult = [EnsureType]::Absent.ToString()
        }
    }

    $returnValue = @{
        Path = $Path
        ServiceName = $ServiceName
        Ensure = $ensureResult
    }

    return $returnValue
}


function Set-TargetResource
{
    [CmdletBinding()]
    param
    (
        [parameter(Mandatory = $true)]
        [System.String]$Path,

        [parameter(Mandatory = $true)]
        [System.String]$ServiceName,

        [parameter(Mandatory = $true)]
        [ValidateSet("Present","Absent")]
        [System.String]$Ensure
    )

    if ($Ensure -eq [EnsureType]::Absent.ToString())
    {
        UninstallTopShelfService -Path $Path
        return;
    }
    
    InstallTopShelfService -Path $Path
}


function Test-TargetResource
{
    [CmdletBinding()]
    [OutputType([System.Boolean])]
    param
    (
        [parameter(Mandatory = $true)]
        [System.String]$Path,

        [parameter(Mandatory = $true)]
        [System.String]$ServiceName,

        [parameter(Mandatory = $true)]
        [ValidateSet("Present","Absent")]
        [System.String]$Ensure
    )

    $result = (Get-TargetResource -Path $Path -ServiceName $ServiceName -Ensure $Ensure).Ensure -eq $Ensure
    return $result
}