dbatools

1.0.166

internal/functions/Test-DbaRestoreVersion.ps1

                                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)

       Copyright: (c) 2018 by dbatools, licensed under MIT

        License: MIT https://opensource.org/licenses/MIT

    .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)]

        [object]$SqlInstance,

        [parameter(Mandatory)]

        [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

}

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