internal/functions/Test-DbaRestoreVersion.ps1
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function Test-DbaRestoreVersion { <# .SYNOPSIS Checks that the restore files are from a version of SQL Server that can be restored on the target version .DESCRIPTION Finds the anchoring Full backup (or multiple if it's a striped set). Then filters to ensure that all the backups are from that anchor point (LastLSN) and that they're all on the same RecoveryForkID Then checks that we have either enough Diffs and T-log backups to get to where we want to go. And checks that there is no break between LastLSN and FirstLSN in sequential files .PARAMETER FilteredRestoreFiles This is just an object consisting of the output from Read-DbaBackupHeader. Normally this will have been filtered down to a restorable chain before arriving here. (ie; only 1 anchoring Full backup) .PARAMETER SqlInstance Sql Server Instance against which the restore is going to be performed .PARAMETER SqlCredential Credential for connecting to SqlInstance .PARAMETER SystemDatabaseRestore Switch when restoring system databases .NOTES Author: Stuart Moore (@napalmgram), stuart-moore.com Tags: dbatools PowerShell module (https://dbatools.io, clemaire@gmail.com) Copyright (C) 2016 Chrissy LeMaire License: GNU GPL v3 https://opensource.org/licenses/GPL-3.0 .EXAMPLE Test-DbaRestoreVersion -FilteredRestoreFiles $FilteredFiles -SqlInstance server1\instance1 Checks that the Restore chain in $FilteredFiles is compatible with the SQL Server version of server1\instance1 #> [CmdletBinding()] param ( [parameter(Mandatory = $true)] [Alias("ServerInstance", "SqlServer")] [object]$SqlInstance, [parameter(Mandatory = $true)] [object[]]$FilteredRestoreFiles, [PSCredential]$SqlCredential, [switch]$SystemDatabaseRestore ) $RestoreVersion = ($FilteredRestoreFiles.SoftwareVersionMajor | Measure-Object -average).average Write-Message -Level Verbose -Message "RestoreVersion is $RestoreVersion" #Test to make sure we don't have an upgrade mid backup chain, there's a reason I'm paranoid.. if ([int]$RestoreVersion -ne $RestoreVersion) { Write-Message -Level Warning -Message "Version number change during backups - $RestoreVersion" return $false break } #Can't restore backwards try { if ($SqlInstance -isnot [Microsoft.SqlServer.Management.Smo.SqlSmoObject]) { $Newconnection = $true $Server = Connect-SqlInstance -SqlInstance $SqlInstance -SqlCredential $SqlCredential } else { $server = $SqlInstance } } catch { Write-Message -Level Warning -Message "Cannot connect to $SqlInstance" break } if ($SystemDatabaseRestore) { if ($RestoreVersion -ne $Server.VersionMajor) { Write-Message -Level Warning -Message "For System Database restore versions must match)" return $false break } } else { if ($RestoreVersion -gt $Server.VersionMajor) { Write-Message -Level Warning -Message "Backups are from a newer version of SQL Server than $($Server.Name)" return $false break } if (($Server.VersionMajor -gt 10 -and $RestoreVersion -lt 9) ) { Write-Message -Level Warning -Message "This version - $RestoreVersion - too old to restore on to $($Server.Name)" return $false break } } if ($Newconnection) { $server.ConnectionContext.Disconnect() } return $True } |