functions/Test-DbaBackupInformation.ps1
|
Function Test-DbaBackupInformation { <# .SYNOPSIS Tests a dbatools backuphistory object is correct for restoring .DESCRIPTION Normally takes in a backuphistory object from Format-DbaBackupInformation This is then parse to check that it's valid for restore. Tests performed include: Checking unbroken LSN chain If the target database exists and WithReplace has been provided If any files already exist, but owned by other databases Creates any new folders required That the backupfiles exists at the location specified, and can be seen by the Sql Instance If no errors are found then the objects for that database will me marked as Verified. .PARAMETER BackupHistory dbatools BackupHistory object. Normally this will have been process with Select- and then Format-DbaBackupInformation .PARAMETER SqlInstance The Sql Server instance that wil be performing the restore .PARAMETER SqlCredential A Sql Credential to connect to $SqlInstance .PARAMETER WithReplace By default we won't overwrite an existing database, this switch tells us you want to .PARAMETER Continue Switch to indicate a continuing restore .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 Shows what would happen if the cmdlet runs. The cmdlet is not run. .PARAMETER Confirm Prompts you for confirmation before running the cmdlet. .EXAMPLE $BackupHistory | Test-DbaBackupInformation -SqlInstance MyInstance $PassedDbs = $BackupHistory | Where-Object {$_.IsVerified -eq $True} $FailedDbs = $BackupHistory | Where-Object {$_.IsVerified -ne $True} Pass in a BackupHistory object to be tested against MyInstance. Those records that pass are marked as verified. We can then use the IsVerified property to divide the failures and succeses .NOTES Author:Stuart Moore (@napalmgram stuart-moore.com ) DisasterRecovery, Backup, Restore Website: https://dbatools.io Copyright: (C) Chrissy LeMaire, clemaire@gmail.com License: GNU GPL v3 https://opensource.org/licenses/GPL-3.0 .LINK https://dbatools.io/Test-DbaBackupInformation #> [CmdletBinding(SupportsShouldProcess = $true, ConfirmImpact = "Low")] param ( [parameter(Mandatory = $true, ValueFromPipeline = $true)] [object[]]$BackupHistory, [Alias("ServerInstance", "SqlServer")] [DbaInstanceParameter]$SqlInstance, [PSCredential]$SqlCredential, [switch]$Withreplace, [switch]$continue, [switch]$EnableException ) Begin{ try { $RestoreInstance = Connect-SqlInstance -SqlInstance $SqlInstance -SqlCredential $SqlCredential } catch { Stop-Function -Message "Failure" -Category ConnectionError -ErrorRecord $_ -Target $instance -Continue return } $InternalHistory = @() } Process{ ForEach ($bh in $BackupHistory){ $InternalHistory += $bh } } End{ $Databases = $InternalHistory.Database | Select-Object -Unique ForEach ($Database in $Databases){ $VerificationErrors = 0 Write-Message -Message "Testing restore for $Database" -Level Verbose #Test we're only restoring backups from one dataase, or hilarity will ensure $DbHistory = $InternalHistory | Where-Object {$_.Database -eq $Database} if (( $DbHistory | Select-Object -Property OriginalDatabase -unique ).count -gt 1){ Write-Message -Message "Trying to restore $Database from multiple sources databases" -Level Warning $VerificationErrors++ } #Test Db Existance on destination $DbCheck = Get-DbaDatabase -SqlInstance $RestoreInstance -Database $Database if ($null -ne $DbCheck -and ($WithReplace -ne $true -and $continue -ne $true)){ Write-Message -Message "Database $Database exists and WithReplace not specified, stopping" -Level Warning $VerificationErrors++ } #Test no destinations exist $DbFileCheck = (Get-DbaDatabaseFile -SqlInstance $RestoreInstance -Database $Database).PhysicalName $OtherFileCheck = (Get-DbaDatabaseFile -SqlInstance $RestoreInstance -ExcludeDatabase $Database).PhysicalName ForEach ($path in ($DbHistory | Select-Object -ExpandProperty filelist | Select-Object PhysicalName -Unique).physicalname){ if(Test-DbaSqlPath -SqlInstance $RestoreInstance -Path $path){ if (($path -in $DBFileCheck) -and ($WithReplace -ne $True -and $Continue -ne $True)) { Write-Message -Message "File $Path already exists on $SqlInstance and WithReplace not specified, cannot restore" -Level Warning $VerificationErrors++ } elseif ($path -in $OtherFileCheck){ Write-Message -Message "File $Path already exists on $SqlInstance and owned by another database, cannot restore" -Level Warning $VerificationErrors++ } } else { if (!(Test-DbaSqlPath -SqlInstance $RestoreInstance -Path (Split-path $path)) ){ $ConfirmMessage = "`n Creating Folder $(Split-Path $path) on $SqlInstance `n" If ($Pscmdlet.ShouldProcess("$Path on $SqlInstance `n `n", $ConfirmMessage)) { if (New-DbaSqlDirectory -SqlInstance $RestoreInstance -Path (Split-path $path)){ Write-Message -Message "Created Folder $(Split-path $path) on $SqlInstance" -Level Verbose } else { Write-Message -Message "Failed to create $(Split-path $path) on $SqlInstance" -Level Warning $VerificationErrors++ } } } } } #Test all backups readable Foreach ($path in ($DbHistory | Select-Object -ExpandProperty FullName)){ if(!(Test-DbaSqlPath -SqlInstance $RestoreInstance -Path $path)){ Write-Message -Message "Backup File $path cannot be read" -Level Warning $VerificationErrors++ } } #Test for LSN chain if ($true -ne $Continue){ if (!($DbHistory | Test-DbaLsnChain)) { Write-Message -Message "LSN Check failed" -Level Verbose $VerificationErrors++ } } if ($VerificationErrors -eq 0){ Write-Message -Message "Marking $Database as verified" -Level Verbose $InternalHistory | Where-Object {$_.Database -eq $Database} | ForEach-Object {$_.IsVerified = $True} } else{ Write-Message -Message "Verification errors = $VerificationErrors - Has not Passed" -Level Verbose } } $InternalHistory } } |