functions/Import-DbaSpConfigure.ps1

function Import-DbaSpConfigure {
    <#
    .SYNOPSIS
        Updates sp_configure settings on destination server.
 
    .DESCRIPTION
        Updates sp_configure settings on destination server.
 
    .PARAMETER Source
        Source SQL Server. You must have sysadmin access and server version must be SQL Server version 2000 or higher.
 
    .PARAMETER Destination
        Destination SQL Server. You must have sysadmin access and the server must be SQL Server 2000 or higher.
 
    .PARAMETER SourceSqlCredential
        Login to the target instance using alternative credentials. Accepts PowerShell credentials (Get-Credential).
 
        Windows Authentication, SQL Server Authentication, Active Directory - Password, and Active Directory - Integrated are all supported.
 
        For MFA support, please use Connect-DbaInstance.
 
    .PARAMETER DestinationSqlCredential
        Login to the target instance using alternative credentials. Accepts PowerShell credentials (Get-Credential).
 
        Windows Authentication, SQL Server Authentication, Active Directory - Password, and Active Directory - Integrated are all supported.
 
        For MFA support, please use Connect-DbaInstance.
 
    .PARAMETER SqlInstance
        Specifies a SQL Server instance to set up sp_configure values on using a SQL file.
 
    .PARAMETER SqlCredential
        Use this SQL credential if you are setting up sp_configure values from a SQL file.
 
        Login to the target instance using alternative credentials. Accepts PowerShell credentials (Get-Credential).
 
        Windows Authentication, SQL Server Authentication, Active Directory - Password, and Active Directory - Integrated are all supported.
 
        For MFA support, please use Connect-DbaInstance.
 
    .PARAMETER Path
        Specifies the path to a SQL script file holding sp_configure queries for each of the settings to be changed. Export-DbaSPConfigure creates a suitable file as its output.
 
    .PARAMETER Force
        If this switch is enabled, no version check between Source and Destination is performed. By default, the major and minor versions of Source and Destination must match when copying sp_configure settings.
 
    .PARAMETER EnableException
        By default, when something goes wrong we try to catch it, interpret it and give you a friendly warning message.
        This avoids overwhelming you with "sea of red" exceptions, but is inconvenient because it basically disables advanced scripting.
        Using this switch turns this "nice by default" feature off and enables you to catch exceptions with your own try/catch.
 
    .PARAMETER WhatIf
        If this switch is enabled, no actions are performed but informational messages will be displayed that explain what would happen if the command were to run.
 
    .PARAMETER Confirm
        If this switch is enabled, you will be prompted for confirmation before executing any operations that change state.
 
    .NOTES
        Tags: SpConfig, Configure, Configuration
        Author: Chrissy LeMaire (@cl), netnerds.net
 
        Website: https://dbatools.io
        Copyright: (c) 2018 by dbatools, licensed under MIT
        License: MIT https://opensource.org/licenses/MIT
 
    .LINK
        https://dbatools.io/Import-DbaSpConfigure
 
    .INPUTS
        None You cannot pipe objects to Import-DbaSpConfigure
 
    .OUTPUTS
        $true if success
        $false if failure
 
    .EXAMPLE
        PS C:\> Import-DbaSpConfigure -Source sqlserver -Destination sqlcluster
 
        Imports the sp_configure settings from the source server sqlserver and sets them on the sqlcluster server using Windows Authentication
 
    .EXAMPLE
        PS C:\> Import-DbaSpConfigure -Source sqlserver -Destination sqlcluster -Force
 
        Imports the sp_configure settings from the source server sqlserver and sets them on the sqlcluster server using Windows Authentication. Will not do a version check between Source and Destination
 
    .EXAMPLE
        PS C:\> Import-DbaSpConfigure -Source sqlserver -Destination sqlcluster -SourceSqlCredential $SourceSqlCredential -DestinationSqlCredential $DestinationSqlCredential
 
        Imports the sp_configure settings from the source server sqlserver and sets them on the sqlcluster server using the SQL credentials stored in the variables $SourceSqlCredential and $DestinationSqlCredential
 
    .EXAMPLE
        PS C:\> Import-DbaSpConfigure -SqlInstance sqlserver -Path .\spconfig.sql -SqlCredential $SqlCredential
 
        Imports the sp_configure settings from the file .\spconfig.sql and sets them on the sqlserver server using the SQL credential stored in the variable $SqlCredential
 
    #>

    [CmdletBinding(DefaultParameterSetName = "Default", SupportsShouldProcess, ConfirmImpact = "Medium")]
    param (
        [Parameter(ParameterSetName = "ServerCopy")]
        [DbaInstanceParameter]$Source,
        [Parameter(ParameterSetName = "ServerCopy")]
        [DbaInstanceParameter]$Destination,
        [Parameter(ParameterSetName = "ServerCopy")]
        [PSCredential]$SourceSqlCredential,
        [Parameter(ParameterSetName = "ServerCopy")]
        [PSCredential]$DestinationSqlCredential,
        [Parameter(ParameterSetName = "FromFile")]
        [DbaInstanceParameter]$SqlInstance,
        [Parameter(ParameterSetName = "FromFile")]
        [string]$Path,
        [Parameter(ParameterSetName = "FromFile")]
        [PSCredential]$SqlCredential,
        [switch]$Force,
        [switch]$EnableException
    )
    begin {

        if ($Path.length -eq 0) {
            try {
                $sourceserver = Connect-SqlInstance -SqlInstance $Source -SqlCredential $SourceSqlCredential
            } catch {
                Stop-Function -Message "Failed to process Instance $Source" -ErrorRecord $_ -Target $Source
                return
            }

            if (!(Test-SqlSa -SqlInstance $sourceserver -SqlCredential $SourceSqlCredential)) {
                Stop-Function -Message "Not a sysadmin on $sourceserver. Quitting." -Category PermissionDenied -ErrorRecord $_ -Target $server -Continue
            }

            try {
                $destserver = Connect-SqlInstance -SqlInstance $Destination -SqlCredential $DestinationSqlCredential
            } catch {
                Stop-Function -Message "Failed to process Instance $Destination" -ErrorRecord $_ -Target $Destination
                return
            }

            if (!(Test-SqlSa -SqlInstance $destserver -SqlCredential $DestinationSqlCredential)) {
                Stop-Function -Message "Not a sysadmin on $destserver. Quitting." -Category PermissionDenied -ErrorRecord $_ -Target $server -Continue
            }

            $source = $sourceserver.DomainInstanceName
            $destination = $destserver.DomainInstanceName
        } else {
            try {
                $server = Connect-SqlInstance -SqlInstance $SqlInstance -SqlCredential $SqlCredential
            } catch {
                Stop-Function -Message "Failed to process Instance $SqlInstance" -ErrorRecord $_ -Target $SqlInstance -Continue
            }

            if (!(Test-SqlSa -SqlInstance $server -SqlCredential $SqlCredential)) {
                Stop-Function -Message "Not a sysadmin on $server. Quitting." -Category PermissionDenied -ErrorRecord $_ -Target $server -Continue
            }

            if ((Test-Path $Path) -eq $false) {
                Stop-Function -Message "File $Path Not Found" -Category InvalidArgument -Target $Path -Continue
            }
        }

        if ($Force) { $ConfirmPreference = 'none' }
    }
    process {
        if ($Path.length -eq 0) {
            if ($Pscmdlet.ShouldProcess($destination, "Export sp_configure")) {
                $sqlfilename = Export-DbaSpConfigure $sourceserver
            }

            if ($sourceserver.versionMajor -ne $destserver.versionMajor -and $force -eq $false) {
                Write-Message -Level Warning -Message "Source SQL Server major version and Destination SQL Server major version must match for sp_configure migration. Use -Force to override this precaution or check the exported sql file, $sqlfilename, and run manually."
                return
            }

            If ($Pscmdlet.ShouldProcess($destination, "Execute sp_configure")) {
                $sourceserver.Configuration.ShowAdvancedOptions.ConfigValue = $true
                $sourceserver.Configuration.Alter($true)
                $destserver.Configuration.ShowAdvancedOptions.ConfigValue = $true
                $sourceserver.Configuration.Alter($true)

                $destprops = $destserver.Configuration.Properties

                foreach ($sourceprop in $sourceserver.Configuration.Properties) {
                    $displayname = $sourceprop.DisplayName

                    $destprop = $destprops | Where-Object { $_.Displayname -eq $displayname }
                    if ($null -ne $destprop) {
                        try {
                            $destprop.configvalue = $sourceprop.configvalue
                            $null = $destserver.Query("RECONFIGURE WITH OVERRIDE")
                            Write-Message -Level Output -Message "updated $($destprop.displayname) to $($sourceprop.configvalue)."
                        } catch {
                            Stop-Function -Message "Could not set $($destprop.displayname) to $($sourceprop.configvalue). Feature may not be supported." -ErrorRecord $_ -Continue
                        }
                    }
                }
                try {
                    $destserver.Configuration.Alter()
                } catch {
                    $needsrestart = $true
                }

                $sourceserver.Configuration.ShowAdvancedOptions.ConfigValue = $false
                $sourceserver.Configuration.Alter($true)
                $destserver.Configuration.ShowAdvancedOptions.ConfigValue = $false
                $destserver.Configuration.Alter($true)

                if ($needsrestart -eq $true) {
                    Write-Message -Level Warning -Message "Some configuration options will be updated once SQL Server is restarted."
                } else {
                    Write-Message -Level Output -Message "Configuration option has been updated."
                }
            }

            if ($Pscmdlet.ShouldProcess($destination, "Removing temp file")) {
                Remove-Item $sqlfilename -ErrorAction SilentlyContinue
            }

        } else {
            if ($Pscmdlet.ShouldProcess($destination, "Importing sp_configure from $Path")) {
                $server.Configuration.ShowAdvancedOptions.ConfigValue = $true
                $sql = Get-Content $Path
                foreach ($line in $sql) {
                    try {
                        $null = $server.Query($line)
                        Write-Message -Level Output -Message "Successfully executed $line."
                    } catch {
                        Stop-Function -Message "$line failed. Feature may not be supported." -ErrorRecord $_ -Continue
                    }
                }
                $server.Configuration.ShowAdvancedOptions.ConfigValue = $false
                Write-Message -Level Warning -Message "Some configuration options will be updated once SQL Server is restarted."
            }
        }
    }
    end {
        if ($Path.length -gt 0) {
            $server.ConnectionContext.Disconnect()
        } else {
            $sourceserver.ConnectionContext.Disconnect()
            $destserver.ConnectionContext.Disconnect()
        }

        If ($Pscmdlet.ShouldProcess("console", "Showing finished message")) {
            Write-Message -Level Output -Message "SQL Server configuration options migration finished."
        }
    }
}