Manual Log Shipping with PowerShell

-- =============================================
-- Author:      Gianluca Sartori - @spaghettidba
-- Create date: 2013-02-07
-- Description: Creates a table to hold manual
--              log shipping configuration
-- =============================================

CREATE TABLE msdb.dbo.ManualLogShippingConfig (
    secondary sysname PRIMARY KEY CLUSTERED, -- Name of the secondary SQL Server instance
    sharedBackupFolder varchar(255),         -- UNC path to the backup path on the secondary
    remoteBackupFolder varchar(255)          -- Path to the backup folder on the secondary
                                             -- It's the same path as sharedBackupFolder,
                                             -- as seen from the secondary server
)
GO

INSERT INTO msdb.dbo.ManualLogShippingConfig (
    secondary,
    sharedBackupFolder,
    remoteBackupFolder
)
VALUES (
    'SomeServer',
    '\\SomeShare',
    'Local path of SomeShare on secondary'
)
GO

## =============================================
## Author:      Gianluca Sartori - @spaghettidba
## Create date: 2013-02-07
## Description: Ships the log to a secondary server
## =============================================
sl c:\
$ErrorActionPreference = "Stop"

$primary = "$(ESCAPE_DQUOTE(SRVR))"

#
# Read Configuration from the table in msdb
#

$SQL_Config = @"
    SELECT * FROM msdb.dbo.ManualLogShippingConfig
"@

$info = Invoke-sqlcmd -Query $SQL_Config -ServerInstance $primary

$secondary = $info.secondary
$sharedFolder = $info.sharedBackupFolder
$remoteSharedFolder = $info.remoteBackupFolder

$ts = Get-Date -Format yyyyMMddHHmmss

#
# Read default backup path of the primary from the registry
#

$SQL_BackupDirectory = @"
    EXEC master.dbo.xp_instance_regread
        N'HKEY_LOCAL_MACHINE',
        N'Software\Microsoft\MSSQLServer\MSSQLServer',
        N'BackupDirectory'
"@

$info = Invoke-sqlcmd -Query $SQL_BackupDirectory -ServerInstance $primary

$BackupDirectory = $info.Data

#
# Ship the log of all databases in FULL recovery model
# You can change this to ship a single database's log
#

$SQL_FullRecoveryDatabases = @"
    SELECT name
    FROM master.sys.databases
    WHERE recovery_model_desc = 'FULL'
        AND name NOT IN ('master', 'model', 'msdb', 'tempdb')
"@

$info = Invoke-sqlcmd -Query $SQL_FullRecoveryDatabases -ServerInstance $primary

$info | ForEach-Object {

    $DatabaseName = $_.Name

    Write-Output "Processing database $DatabaseName"

    $BackupFile = $DatabaseName + "_" + $ts + ".trn"
    $BackupPath = Join-Path $BackupDirectory $BackupFile
    $RemoteBackupPath = Join-Path $remoteSharedFolder $BackupFile

    $SQL_BackupDatabase = "BACKUP LOG $DatabaseName TO DISK='$BackupPath' WITH INIT;"

    $SQL_NonCopiedBackups = "
        SELECT physical_device_name
        FROM msdb.dbo.backupset AS BS
        INNER JOIN msdb.dbo.backupmediaset AS BMS
            ON BS.media_set_id = BMS.media_set_id
        INNER JOIN msdb.dbo.backupmediafamily AS BMF
            ON BMS.media_set_id = BMF.media_set_id
        WHERE BS.database_name = '$DatabaseName'
            AND BS.type = 'L'
            AND expiration_date IS NULL
        ORDER BY BS.backup_start_date
    "

    #
    # Backup log to local path
    #
    Invoke-Sqlcmd -Query $SQL_BackupDatabase -ServerInstance $primary -QueryTimeout 65535

    Write-Output "LOG backed up to $BackupPath"

    #
    # Query noncopied backups...
    #
    $nonCopiedBackups = Invoke-Sqlcmd -Query $SQL_NonCopiedBackups -ServerInstance $primary

    $nonCopiedBackups | ForEach-Object {

        $BackupPath = $_.physical_device_name

        $BackupFile = Split-Path $BackupPath -Leaf

        $RemoteBackupPath = Join-Path $remoteSharedFolder $BackupFile

        $SQL_RestoreDatabase = "
            RESTORE LOG $DatabaseName
            FROM DISK='$RemoteBackupPath'
            WITH NORECOVERY;
        "

        $SQL_ExpireBackupSet = "
            UPDATE BS
            SET expiration_date = GETDATE()
            FROM msdb.dbo.backupset AS BS
            INNER JOIN msdb.dbo.backupmediaset AS BMS
                ON BS.media_set_id = BMS.media_set_id
            INNER JOIN msdb.dbo.backupmediafamily AS BMF
                ON BMS.media_set_id = BMF.media_set_id
            WHERE BS.database_name = '$DatabaseName'
                AND BS.type = 'L'
                AND physical_device_name = '$BackupPath'
        "

        #
        # Move the transaction log backup to the secondary
        #
        if (Test-Path $BackupPath) {
            Write-Output "Moving $BackupPath to $sharedFolder"
            Move-Item -Path ("Microsoft.PowerShell.Core\FileSystem::" + $BackupPath) -Destination ("Microsoft.PowerShell.Core\FileSystem::" + $sharedFolder) -Force
        }

        #
        # Restore the backup on the secondary
        #
        Invoke-Sqlcmd -Query $SQL_RestoreDatabase -ServerInstance $secondary -QueryTimeout 65535
        Write-Output "Restored LOG from $RemoteBackupPath"

        #
        # Delete the backup file
        #
        Write-Output "Deleting $RemoteBackupPath"
        Remove-Item $RemoteBackupPath -ErrorAction SilentlyContinue

        #
        # Mark the backup as expired
        #
        Write-Output "Expiring backup set $BackupPath"
        Invoke-Sqlcmd -Query $SQL_ExpireBackupSet -ServerInstance $primary

    }
}