dsmonrot.ps1

   1 # DSMonRot
   2 # Script for rotating Drive Snapshot backups monthly
   3 #
   4 # Author: Patrick Canterino <patrick@patrick-canterino.de>
   5 # WWW: https://www.patrick-canterino.de/
   6 #      https://github.com/pcanterino/dsmonrot
   7 # License: 2-Clause BSD License
   8 #
   9 # Drive Snapshot is copyright by Tom Ehlert
  10 # http://www.drivesnapshot.de/
  11
  12 # Config
  13
  14 # Path to backup directory
  15 # This directory MUST exist, it is not created automatically!
  16 [String]$backupDir = "Z:\"
  17 # Disks to backup, see http://www.drivesnapshot.de/en/commandline.htm
  18 [String]$disksToBackup = "D1:1"
  19 # Path to Drive Snapshot
  20 [String]$dsPath = "C:\Users\Patrick\Desktop\DSMonRot\snapshot.exe"
  21 # Keep backups for this amount of months (excluding the current month),
  22 # -1 for indefinite
  23 [Int32]$keepMonths = 2
  24 # Rotate BEFORE the beginning of a full backup (default is after a successful
  25 # full backup)
  26 # WARNING: If this option is set to $True and the full backup fails you could
  27 # have NO backup
  28 [Boolean]$rotateBeforeBackup = $False
  29 # Set to $True if you want to allow multiple backups for a day
  30 [Boolean]$multipleDailyBackups = $False
  31 # Path to Drive Snapshot log file (specify only the file name if you set
  32 # $dsLogFileToBackup to $True)
  33 #[String]$dsLogFile = "C:\Users\Patrick\Desktop\DSMonRot\snapshot.log"
  34 [String]$dsLogFile = "snapshot.log"
  35 # Set to $True if you want to put the log file of Drive Snapshot into the same
  36 # directory as the backup
  37 [Boolean]$dsLogFileToBackup = $True
  38 # Path to directory where DSMonRot stores the log files
  39 # Every month a new log file is created
  40 [String]$logDir = "$PSScriptRoot\log"
  41 # Keep log files for this amount of months (excluding the current month),
  42 # 0 or less for indefinite
  43 # You should set this to at least the same as $keepMonths
  44 [Int32]$keepLogs = 2
  45
  46 # Map network share to this drive letter, comment out if you don't want to use it
  47 [String]$smbDrive = "Z"
  48 # Path to network share
  49 [String]$smbPath = "\\192.168.0.3\ds"
  50 # User and password for connecting to network share, comment out if you don't want to use it
  51 # (for example if you want to pass current Windows credentials)
  52 [String]$smbUser = "patrick"
  53 [String]$smbPassword = ""
  54
  55 # Send an email if an error occured
  56 [Boolean]$emailOnError = $True
  57 # From address of email notification
  58 [String]$emailFromAddress = "alarm@test.local"
  59 # To address of email notification
  60 [String]$emailToAddress = "patrick@test.local"
  61 # Subject of email notification
  62 [String]$emailSubject = "DSMonRot on $env:computername"
  63 # Mail server
  64 [String]$emailMailserver = "localhost"
  65 # SMTP Port
  66 [Int32]$emailPort = 25
  67 # Use SSL?
  68 [Boolean]$emailSSL = $False
  69 # Use SMTP Auth?
  70 [Boolean]$emailAuth = $False
  71 # SMTP Auth User
  72 [String]$emailUser = ""
  73 # SMTP Auth Password
  74 [String]$emailPassword = ""
  75
  76 # End of config
  77
  78 <#
  79 .Synopsis
  80    Write-Log writes a message to a specified log file with the current time stamp.
  81 .DESCRIPTION
  82    The Write-Log function is designed to add logging capability to other scripts.
  83    In addition to writing output and/or verbose you can write to a log file for
  84    later debugging.
  85 .NOTES
  86    Created by: Jason Wasser @wasserja
  87    Modified: 11/24/2015 09:30:19 AM
  88
  89    Changelog:
  90     * Code simplification and clarification - thanks to @juneb_get_help
  91     * Added documentation.
  92     * Renamed LogPath parameter to Path to keep it standard - thanks to @JeffHicks
  93     * Revised the Force switch to work as it should - thanks to @JeffHicks
  94
  95    To Do:
  96     * Add error handling if trying to create a log file in a inaccessible location.
  97     * Add ability to write $Message to $Verbose or $Error pipelines to eliminate
  98       duplicates.
  99 .PARAMETER Message
 100    Message is the content that you wish to add to the log file.
 101 .PARAMETER Path
 102    The path to the log file to which you would like to write. By default the function will
 103    create the path and file if it does not exist.
 104 .PARAMETER Level
 105    Specify the criticality of the log information being written to the log (i.e. Error, Warning, Informational)
 106 .PARAMETER NoClobber
 107    Use NoClobber if you do not wish to overwrite an existing file.
 108 .EXAMPLE
 109    Write-Log -Message 'Log message'
 110    Writes the message to c:\Logs\PowerShellLog.log.
 111 .EXAMPLE
 112    Write-Log -Message 'Restarting Server.' -Path c:\Logs\Scriptoutput.log
 113    Writes the content to the specified log file and creates the path and file specified.
 114 .EXAMPLE
 115    Write-Log -Message 'Folder does not exist.' -Path c:\Logs\Script.log -Level Error
 116    Writes the message to the specified log file as an error message, and writes the message to the error pipeline.
 117 .LINK
 118    https://gallery.technet.microsoft.com/scriptcenter/Write-Log-PowerShell-999c32d0
 119 #>
 120 function Write-Log
 121 {
 122     [CmdletBinding()]
 123     Param
 124     (
 125         [Parameter(Mandatory=$true,
 126                    ValueFromPipelineByPropertyName=$true)]
 127         [ValidateNotNullOrEmpty()]
 128         [Alias("LogContent")]
 129         [string]$Message,
 130
 131         [Parameter(Mandatory=$false)]
 132         [Alias('LogPath')]
 133         [string]$Path='C:\Logs\PowerShellLog.log',
 134
 135         [Parameter(Mandatory=$false)]
 136         [ValidateSet("Error","Warn","Info")]
 137         [string]$Level="Info",
 138
 139         [Parameter(Mandatory=$false)]
 140         [switch]$NoClobber
 141     )
 142
 143     Begin
 144     {
 145         # Set VerbosePreference to Continue so that verbose messages are displayed.
 146         $VerbosePreference = 'Continue'
 147     }
 148     Process
 149     {
 150
 151         # If the file already exists and NoClobber was specified, do not write to the log.
 152         if ((Test-Path $Path) -AND $NoClobber) {
 153             Write-Error "Log file $Path already exists, and you specified NoClobber. Either delete the file or specify a different name."
 154             Return
 155             }
 156
 157         # If attempting to write to a log file in a folder/path that doesn't exist create the file including the path.
 158         elseif (!(Test-Path $Path)) {
 159             Write-Verbose "Creating $Path."
 160             $NewLogFile = New-Item $Path -Force -ItemType File
 161             }
 162
 163         else {
 164             # Nothing to see here yet.
 165             }
 166
 167         # Format Date for our Log File
 168         $FormattedDate = Get-Date -Format "yyyy-MM-dd HH:mm:ss"
 169
 170         # Write message to error, warning, or verbose pipeline and specify $LevelText
 171         switch ($Level) {
 172             'Error' {
 173                 Write-Error $Message
 174                 $LevelText = 'ERROR:'
 175                 }
 176             'Warn' {
 177                 Write-Warning $Message
 178                 $LevelText = 'WARNING:'
 179                 }
 180             'Info' {
 181                 Write-Verbose $Message
 182                 $LevelText = 'INFO:'
 183                 }
 184             }
 185
 186         # Write log entry to $Path
 187         "$FormattedDate $LevelText $Message" | Out-File -FilePath $Path -Append
 188     }
 189     End
 190     {
 191     }
 192 }
 193
 194 function Send-Email([String]$body) {
 195         try {
 196                 # Allow SMTP with SSL and SMTP Auth
 197                 # see: http://petermorrissey.blogspot.de/2013/01/sending-smtp-emails-with-powershell.html
 198
 199                 $smtp = New-Object System.Net.Mail.SmtpClient($emailMailServer, $emailPort)
 200
 201                 $smtp.EnableSSL = $emailSSL
 202
 203                 if($emailAuth) {
 204                         $smtp.Credentials = New-Object System.Net.NetworkCredential($emailUser, $emailPassword)
 205                 }
 206
 207                 $smtp.Send($emailFromAddress, $emailToAddress, $emailSubject, $body)
 208         }
 209         catch {
 210                 Write-Log "Could not send email: $_.Exception.Message" -Path $logFile -Level Error
 211         }
 212 }
 213
 214 function Rotate-Backup {
 215         if($keepMonths -lt 0) {
 216                 return
 217         }
 218
 219         $keepMonthsCount = $keepMonths
 220
 221         Get-ChildItem $backupDir -Directory | Where-Object {($_.Name -ne $currMonth) -and ($_.Name -match "^\d{4,}-\d{2}$")} | Sort-Object -Descending |
 222         Foreach-Object {
 223                 if($keepMonthsCount -ge 0) {
 224                         $keepMonthsCount--
 225                 }
 226
 227                 if($keepMonthsCount -eq -1) {
 228                         Write-Log "Deleting backup $($_.FullName)" -Path $logFile -Level Info
 229                         Remove-Item -Recurse -Force $_.FullName
 230                 }
 231         }
 232 }
 233
 234 function Rotate-Log {
 235         if($keepLogs -le 0) {
 236                 return
 237         }
 238
 239         $keepLogsCount = $keepLogs
 240
 241         Get-ChildItem $logDir -File | Where-Object {($_.Name -ne "$currMonth.log") -and ($_.Name -match "^\d{4,}-\d{2}\.log$")} | Sort-Object -Descending |
 242         Foreach-Object {
 243                 if($keepLogsCount -ge 0) {
 244                         $keepLogsCount--
 245                 }
 246
 247                 if($keepLogsCount -eq -1) {
 248                         Write-Log "Deleting log file $($_.FullName)" -Path $logFile -Level Info
 249                         Remove-Item -Force $_.FullName
 250                 }
 251         }
 252 }
 253
 254 $dsAdditionalArgs = @("--UseVSS")
 255
 256 $errorMessages = @()
 257
 258 $smbConnected = $False
 259 $success = $False
 260 $isDiff = $False
 261 $dsCommand = ""
 262
 263 $currMonth = Get-Date -format "yyyy-MM"
 264 $currDay = Get-Date -format "yyyy-MM-dd"
 265 $currTime = Get-Date -format "HH-mm-ss" # no colon because we need this for a directory name
 266
 267 # Check if the directory for the log files exists and create it if necessary
 268 if(!(Test-Path $logDir)) {
 269         try {
 270                 New-Item -ItemType directory -Path $logDir -ErrorAction Stop | Out-Null
 271         }
 272         catch {
 273                 Write-Error "Could not create log directory $logDir`: $_.Exception.Message"
 274                 $errorMessages += "Could not create log directory $logDir`: $_.Exception.Message"
 275         }
 276 }
 277
 278 $logFile = "$logDir\$currMonth.log"
 279
 280 # Continue only if the log directory exists or if it was created successfully (no error message added)
 281 if($errorMessages.Count -eq 0) {
 282         $startTime = Get-Date -format "yyyy-MM-dd HH:mm:ss"
 283         Write-Log "Started at $startTime" -Path $logFile
 284
 285         # Connect the network drive if necessary
 286         if($smbDrive) {
 287                 Write-Log "Connecting network drive $smbDrive to $smbPath" -Path $logFile
 288
 289                 try {
 290                         if($smbUser -and $smbPassword) {
 291                                 Write-Log "Connecting to network drive with credentials" -Path $logFile
 292
 293                                 $secSmbPassword = $smbPassword | ConvertTo-SecureString -asPlainText -Force
 294                                 $smbCredential = New-Object System.Management.Automation.PSCredential($smbUser, $secSmbPassword)
 295
 296                                 New-PSDrive -Name $smbDrive -PSProvider "FileSystem" -Root $smbPath -Credential $smbCredential -Persist -ErrorAction Stop | Out-Null
 297                         }
 298                         else {
 299                                 Write-Log "Connecting to network drive without credentials" -Path $logFile
 300
 301                                 New-PSDrive -Name $smbDrive -PSProvider "FileSystem" -Root $smbPath -Persist -ErrorAction Stop | Out-Null
 302                         }
 303
 304                         $smbConnected = $True
 305                 }
 306                 catch {
 307                         Write-Log "Could not connect to network drive $smbDrive`: $_.Exception.Message" -Path $logFile -Level Error
 308                         $errorMessages += "Could not connect to network drive $smbDrive`: $_.Exception.Message"
 309                 }
 310         }
 311
 312         # Check if the backup directory exists
 313         if(!(Test-Path $backupDir)) {
 314                 Write-Log "Directory $backupDir does not exist!" -Path $logFile -Level Error
 315                 $errorMessages += "Directory $backupDir does not exist!"
 316         }
 317
 318         # Continue only if no error message was recorded (i.e. backup directory does not exist)
 319         if($errorMessages.Count -eq 0) {
 320                 # Compose the backup target directories
 321                 $backupTarget = $backupDir + "\" + $currMonth
 322                 $backupTargetFull = $backupTarget + "\Full"
 323
 324                 $backupTargetDiff = $backupTarget + "\Diff-" + $currDay
 325
 326                 if($multipleDailyBackups) {
 327                         $backupTargetDiff = $backupTargetDiff + "-" + $currTime
 328                 }
 329
 330                 # Check if the backup target for this month, the directory for the full backup
 331                 # and the hash files exists. In this case we do a differential backup.
 332                 if((Test-Path $backupTarget) -and (Test-Path $backupTargetFull) -and (Test-Path "$backupTargetFull\*.hsh")) {
 333                         # Do a differential backup
 334
 335                         Write-Log "Doing a differential backup" -Path $logFile
 336
 337                         $isDiff = $True
 338
 339                         if(!(Test-Path $backupTargetDiff)) {
 340                                 try {
 341                                         New-Item -ItemType directory -Path $backupTargetDiff -ErrorAction Stop | Out-Null
 342                                 }
 343                                 catch {
 344                                         Write-Log "Could not create directory $backupTargetDiff`: $_.Exception.Message" -Path $logFile -Level Error
 345                                         $errorMessages += "Could not create directory $backupTargetDiff`: $_.Exception.Message"
 346                                 }
 347
 348                                 if($errorMessages.Count -eq 0) {
 349                                         $dsLogPath = if($dsLogFileToBackup) { "$backupTargetDiff\$dsLogFile" } else { $dsLogFile }
 350
 351                                         $dsArgs = @($disksToBackup, "--logfile:$dsLogPath", "$backupTargetDiff\`$disk.sna", "-h$backupTargetFull\`$disk.hsh") + $dsAdditionalArgs
 352                                         $dsCommand = "$dsPath $dsArgs"
 353
 354                                         Write-Log $dsCommand -Path $logFile
 355
 356                                         & $dsPath $dsArgs
 357
 358                                         if($LastExitCode -ne 0) {
 359                                                 Write-Log "Drive Snapshot failed to backup! Exit code: $LastExitCode" -Path $logFile -Level Error
 360                                                 $errorMessages += "Drive Snapshot failed to backup! Exit code: $LastExitCode"
 361                                         }
 362                                         else {
 363                                                 Write-Log "Drive Snapshot succeeded!" -Path $logFile
 364                                                 $success = $True
 365                                         }
 366                                 }
 367                         }
 368                         else {
 369                                 Write-Log "Directory $backupTargetDiff already exists!" -Path $logFile -Level Error
 370                                 $errorMessages += "Directory $backupTargetDiff already exists!"
 371                         }
 372                 }
 373                 else {
 374                         # Do a full backup
 375
 376                         Write-Log "Doing a full backup" -Path $logFile
 377
 378                         if(!(Test-Path $backupTarget)) {
 379                                 try {
 380                                         New-Item -ItemType directory -Path $backupTarget -ErrorAction Stop | Out-Null
 381                                 }
 382                                 catch {
 383                                         Write-Log "Could not create directory $backupTarget`: $_.Exception.Message" -Path $logFile -Level Error
 384                                         $errorMessages += "Could not create directory $backupTarget`: $_.Exception.Message"
 385                                 }
 386                         }
 387
 388                         if($errorMessages.Count -eq 0) {
 389                                 if(!(Test-Path $backupTargetFull)) {
 390                                         try {
 391                                                 New-Item -ItemType directory -Path $backupTargetFull -ErrorAction Stop | Out-Null
 392                                         }
 393                                         catch {
 394                                                 Write-Log "Could not create directory $backupTargetFull`: $_.Exception.Message" -Path $logFile -Level Error
 395                                                 $errorMessages += "Could not create directory $backupTargetFull`: $_.Exception.Message"
 396                                         }
 397                                 }
 398
 399                                 if($errorMessages.Count -eq 0) {
 400                                         if($rotateBeforeBackup) {
 401                                                 Rotate-Backup
 402                                         }
 403
 404                                         $dsLogPath = if($dsLogFileToBackup) { "$backupTargetFull\$dsLogFile" } else { $dsLogFile }
 405
 406                                         $dsArgs = @($disksToBackup, "--logfile:$dsLogPath", "$backupTargetFull\`$disk.sna") + $dsAdditionalArgs
 407                                         $dsCommand = "$dsPath $dsArgs"
 408
 409                                         Write-Log $dsCommand -Path $logFile
 410
 411                                         & $dsPath $dsArgs
 412
 413                                         if($LastExitCode -ne 0) {
 414                                                 Write-Log "Drive Snapshot failed to backup! Exit code: $LastExitCode" -Path $logFile -Level Error
 415                                                 $errorMessages += "Drive Snapshot failed to backup! Exit code: $LastExitCode"
 416                                         }
 417                                         else {
 418                                                 Write-Log "Drive Snapshot succeeded!" -Path $logFile
 419                                                 $success = $True
 420                                         }
 421
 422                                         if($rotateBeforeBackup -eq $False -and $success -eq $True) {
 423                                                 Rotate-Backup
 424                                         }
 425                                 }
 426                         }
 427                 }
 428         }
 429
 430         # Disconnect the network drive if necessary
 431         if($smbConnected) {
 432                 Write-Log "Disconnecting network drive" -Path $logFile
 433
 434                 try {
 435                         Remove-PSDrive $smbDrive -ErrorAction Stop
 436                 }
 437                 catch {
 438                         Write-Log "Could not disconnect network drive $smbDrive`: $_.Exception.Message" -Path $logFile -Level Error
 439                         $errorMessages +=  "Could not disconnect network drive $smbDrive`: $_.Exception.Message"
 440                 }
 441         }
 442
 443         # Rotate the log files
 444         Rotate-Log
 445 }
 446
 447 # If there was any error message recorded, send a mail if configured
 448 if($emailOnError -and $errorMessages.Count -gt 0) {
 449         $emailBody  = "This is DSMonRot on $env:computername, started at $startTime.`n"
 450         $emailBody += "An error occured while performing a backup. Below are the error messages and some status information.`n`n"
 451         $emailBody += "Backup directory:       $backupDir`n"
 452         $emailBody += "Log directory:          $logDir`n"
 453         $emailBody += "Current log file:       $logFile`n"
 454         $emailBody += "Differential backup:    $isDiff`n"
 455         $emailBody += "Backup successful:      $success`n"
 456         $emailBody += "Drive Snapshot command: $dsCommand`n`n"
 457         $emailBody += ($errorMessages -join "`n")
 458
 459         Send-Email $emailBody
 460 }
 461
 462 $endTime = Get-Date -format "yyyy-MM-dd HH:mm:ss"
 463 Write-Log "Ended at $endTime" -Path $logFile