internal/functions/Get-SqlDefaultPaths.ps1

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function Get-SqlDefaultPaths {
    <#
    .SYNOPSIS
        Internal function. Returns the default data and log paths for SQL Server. Needed because SMO's server.defaultpath is sometimes null.
#>

    [CmdletBinding()]
    [Diagnostics.CodeAnalysis.SuppressMessageAttribute("PSUseSingularNouns", "")]
    param (
        [Parameter(Mandatory)]
        [ValidateNotNullOrEmpty()]
        [Alias("ServerInstance", "SqlServer")]
        [object]$SqlInstance,
        [Parameter(Mandatory)]
        [ValidateNotNullOrEmpty()]
        [string]$filetype,
        [PSCredential]$SqlCredential
    )

    try {
        if ($SqlInstance -isnot [Microsoft.SqlServer.Management.Smo.SqlSmoObject]) {
            $Server = Connect-SqlInstance -SqlInstance $SqlInstance -SqlCredential $SqlCredential
        }
        else {
            $server = $SqlInstance
        }
    }
    catch {
        Write-Message -Lvel Warning -Message "Cannot connect to $SqlInstance"
        break
    }
    switch ($filetype) { "mdf" { $filetype = "data" } "ldf" { $filetype = "log" } }

    if ($filetype -eq "log") {
        # First attempt
        $filepath = $server.DefaultLog
        # Second attempt
        if ($filepath.Length -eq 0) { $filepath = $server.Information.MasterDbLogPath }
        # Third attempt
        if ($filepath.Length -eq 0) {
            $sql = "select SERVERPROPERTY('InstanceDefaultLogPath') as physical_name"
            $filepath = $server.ConnectionContext.ExecuteScalar($sql)
        }
    }
    else {
        # First attempt
        $filepath = $server.DefaultFile
        # Second attempt
        if ($filepath.Length -eq 0) { $filepath = $server.Information.MasterDbPath }
        # Third attempt
        if ($filepath.Length -eq 0) {
            $sql = "select SERVERPROPERTY('InstanceDefaultDataPath') as physical_name"
            $filepath = $server.ConnectionContext.ExecuteScalar($sql)
        }
    }

    if ($filepath.Length -eq 0) { throw "Cannot determine the required directory path" }
    $filepath = $filepath.TrimEnd("\")
    return $filepath
}