functions/Copy-DbaAgentJob.ps1

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function Copy-DbaAgentJob {
    <#
  .SYNOPSIS
   Copy-DbaAgentJob migrates jobs from one SQL Server to another.
 
  .DESCRIPTION
   By default, all jobs are copied. The -Job parameter is auto-populated for command-line completion and can be used to copy only specific jobs.
 
   If the job already exists on the destination, it will be skipped unless -Force is used.
 
  .PARAMETER Source
   Source SQL Server. You must have sysadmin access and server version must be SQL Server version 2000 or higher.
 
  .PARAMETER SourceSqlCredential
   Allows you to login to servers using SQL Logins instead of Windows Authentication (AKA Integrated or Trusted). To use:
 
   $scred = Get-Credential, then pass $scred object to the -SourceSqlCredential parameter.
 
   Windows Authentication will be used if SourceSqlCredential is not specified. SQL Server does not accept Windows credentials being passed as credentials.
 
   To connect as a different Windows user, run PowerShell as that user.
 
  .PARAMETER Destination
   Destination SQL Server. You must have sysadmin access and the server must be SQL Server 2000 or higher.
 
  .PARAMETER DestinationSqlCredential
   Allows you to login to servers using SQL Logins instead of Windows Authentication (AKA Integrated or Trusted). To use:
 
   $dcred = Get-Credential, then pass this $dcred to the -DestinationSqlCredential parameter.
 
   Windows Authentication will be used if DestinationSqlCredential is not specified. SQL Server does not accept Windows credentials being passed as credentials.
 
   To connect as a different Windows user, run PowerShell as that user.
 
  .PARAMETER Job
   The job(s) to process. This list is auto-populated from the server. If unspecified, all jobs will be processed.
 
  .PARAMETER ExcludeJob
   The job(s) to exclude. This list is auto-populated from the server.
 
  .PARAMETER DisableOnSource
   If this switch is enabled, the job will be disabled on the source server.
 
  .PARAMETER DisableOnDestination
   If this switch is enabled, the newly migrated job will be disabled on the destination server.
 
  .PARAMETER WhatIf
   If this switch is enabled, no actions are performed but informational messages will be displayed that explain what would happen if the command were to run.
 
  .PARAMETER Confirm
   If this switch is enabled, you will be prompted for confirmation before executing any operations that change state.
 
  .PARAMETER Force
   If this switch is enabled, the Job will be dropped and recreated on Destination.
 
  .PARAMETER Silent
   If this switch is enabled, the internal messaging functions will be silenced.
 
  .NOTES
   Tags: Migration, Agent, Job
   Author: Chrissy LeMaire (@cl), netnerds.net
 
   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/Copy-DbaAgentJob
 
  .EXAMPLE
   Copy-DbaAgentJob -Source sqlserver2014a -Destination sqlcluster
 
   Copies all jobs from sqlserver2014a to sqlcluster, using Windows credentials. If jobs with the same name exist on sqlcluster, they will be skipped.
 
  .EXAMPLE
   Copy-DbaAgentJob -Source sqlserver2014a -Destination sqlcluster -Job PSJob -SourceSqlCredential $cred -Force
 
   Copies a single job, the PSJob job from sqlserver2014a to sqlcluster, using SQL credentials for sqlserver2014a and Windows credentials for sqlcluster. If a job with the same name exists on sqlcluster, it will be dropped and recreated because -Force was used.
 
  .EXAMPLE
   Copy-DbaAgentJob -Source sqlserver2014a -Destination sqlcluster -WhatIf -Force
 
   Shows what would happen if the command were executed using force.
 #>

    [cmdletbinding(DefaultParameterSetName = "Default", SupportsShouldProcess = $true)]
    param (
        [parameter(Mandatory = $true)]
        [DbaInstanceParameter]$Source,
        [PSCredential]
        $SourceSqlCredential,
        [parameter(Mandatory = $true)]
        [DbaInstanceParameter]$Destination,
        [PSCredential]
        $DestinationSqlCredential,
        [object[]]$Job,
        [object[]]$ExcludeJob,
        [switch]$DisableOnSource,
        [switch]$DisableOnDestination,
        [switch]$Force,
        [switch]$Silent
    )

    begin {

        $sourceServer = Connect-SqlInstance -SqlInstance $Source -SqlCredential $SourceSqlCredential
        $destServer = Connect-SqlInstance -SqlInstance $Destination -SqlCredential $DestinationSqlCredential

        $source = $sourceServer.DomainInstanceName
        $destination = $destServer.DomainInstanceName

    }
    process {

        if (Test-FunctionInterrupt) { return }

        $serverJobs = $sourceServer.JobServer.Jobs
        $destJobs = $destServer.JobServer.Jobs

        foreach ($serverJob in $serverJobs) {
            $jobName = $serverJob.name
            $jobId = $serverJob.JobId

            $copyJobStatus = [pscustomobject]@{
                SourceServer      = $sourceServer.Name
                DestinationServer = $destServer.Name
                Name              = $jobName
                Status            = $null
                Notes             = $null
                DateTime          = [DbaDateTime](Get-Date)
            }

            if ($Job -and $jobName -notin $Job -or $jobName -in $ExcludeJob) { 
                Write-Message -Level Verbose -Message "Job [$jobName] filtered. Skipping."
                continue
            }
            Write-Message -Message "Working on job: $jobName" -Level Verbose
            $sql = "
    SELECT sp.[name] AS MaintenancePlanName
    FROM msdb.dbo.sysmaintplan_plans AS sp
    INNER JOIN msdb.dbo.sysmaintplan_subplans AS sps
     ON sps.plan_id = sp.id
    WHERE job_id = '$($jobId)'"

            Write-Message -Message $sql -Level Debug

            $MaintenancePlanName = $sourceServer.Query($sql).MaintenancePlanName

            if ($MaintenancePlanName) {
                $copyJobStatus.Status = "Skipped"
                $copyJobStatus.Notes = "Job is associated with maintenance plan"
                $copyJobStatus
                Write-Message -Level Warning -Message "Job [$jobName] is associated with Maintenance Plan: $MaintenancePlanName"
                continue
            }

            $dbNames = $serverJob.JobSteps.DatabaseName | Where-Object { $_.Length -gt 0 }
            $missingDb = $dbNames | Where-Object { $destServer.Databases.Name -notcontains $_ }

            if ($missingDb.Count -gt 0 -and $dbNames.Count -gt 0) {
                $missingDb = ($missingDb | Sort-Object | Get-Unique) -join ", "
                $copyJobStatus.Status = "Skipped"
                $copyJobStatus.Notes = "Job is dependent on database: $missingDb"
                $copyJobStatus
                Write-Message -Level Warning -Message "Database(s) $missingDb doesn't exist on destination. Skipping job [$jobName]."
                continue
            }

            $missingLogin = $serverJob.OwnerLoginName | Where-Object { $destServer.Logins.Name -notcontains $_ }

            if ($missingLogin.Count -gt 0) {
                if ($force -eq $false) {
                    $missingLogin = ($missingLogin | Sort-Object | Get-Unique) -join ", "
                    $copyJobStatus.Status = "Skipped"
                    $copyJobStatus.Notes = "Job is dependent on login $missingLogin"
                    $copyJobStatus
                    Write-Message -Level Warning -Message "Login(s) $missingLogin doesn't exist on destination. Use -Force to set owner to [sa]. Skipping job [$jobName]."
                    continue
                }
            }

            $proxyNames = $serverJob.JobSteps.ProxyName | Where-Object { $_.Length -gt 0 }
            $missingProxy = $proxyNames | Where-Object { $destServer.JobServer.ProxyAccounts.Name -notcontains $_ }

            if ($missingProxy.Count -gt 0 -and $proxyNames.Count -gt 0) {
                $missingProxy = ($missingProxy | Sort-Object | Get-Unique) -join ", "
                $copyJobStatus.Status = "Skipped"
                $copyJobStatus.Notes = "Job is dependent on proxy $($proxyNames[0])"
                $copyJobStatus
                Write-Message -Level Warning -Message "Proxy Account(s) $($proxyNames[0]) doesn't exist on destination. Skipping job [$jobName]."
                continue
            }

            $operators = $serverJob.OperatorToEmail, $serverJob.OperatorToNetSend, $serverJob.OperatorToPage | Where-Object { $_.Length -gt 0 }
            $missingOperators = $operators | Where-Object {$destServer.JobServer.Operators.Name -notcontains $_}

            if ($missingOperators.Count -gt 0 -and $operators.Count -gt 0) {
                $missingOperator = ($operators | Sort-Object | Get-Unique) -join ", "
                $copyJobStatus.Status = "Skipped"
                $copyJobStatus.Notes = "Job is dependent on operator $missingOperator"
                $copyJobStatus
                Write-Message -Level Warning -Message "Operator(s) $($missingOperator) doesn't exist on destination. Skipping job [$jobName]"
                continue
            }

            if ($destJobs.name -contains $serverJob.name) {
                if ($force -eq $false) {
                    $copyJobStatus.Status = "Skipped"
                    $copyJobStatus.Notes = "Job already exist on destination"
                    $copyJobStatus
                    Write-Message -Level Warning -Message "Job $jobName exists at destination. Use -Force to drop and migrate."
                    continue
                }
                else {
                    if ($Pscmdlet.ShouldProcess($destination, "Dropping job $jobName and recreating")) {
                        try {
                            Write-Message -Message "Dropping Job $jobName" -Level Verbose
                            $destServer.JobServer.Jobs[$jobName].Drop()
                        }
                        catch {
                            $copyJobStatus.Status = "Failed"
                            $copyJobStatus.Notes = $_.Exception.Message
                            $copyJobStatus
                            Stop-Function -Message "Issue dropping job" -Target $jobName -ErrorRecord $_ -Continue
                        }
                    }
                }
            }

            if ($Pscmdlet.ShouldProcess($destination, "Creating Job $jobName")) {
                try {
                    Write-Message -Message "Copying Job $jobName" -Level Verbose
                    $sql = $serverJob.Script() | Out-String

                    if ($missingLogin.Count -gt 0 -and $force) {
                        $saLogin = Get-SqlSaLogin -SqlInstance $destServer
                        $sql = $sql -replace [Regex]::Escape("@owner_login_name=N'$missingLogin'"), [Regex]::Escape("@owner_login_name=N'$saLogin'")
                    }

                    Write-Message -Message $sql -Level Debug
                    $destServer.Query($sql)

                    $destServer.JobServer.Jobs.Refresh()
                }
                catch {
                    $copyJobStatus.Status = "Failed"
                    $copyJobStatus.Notes = $_.Exception.Message
                    $copyJobStatus
                    Stop-Function -Message "Issue copying job." -Target $jobName -ErrorRecord $_ -Continue
                }
            }

            if ($DisableOnDestination) {
                if ($Pscmdlet.ShouldProcess($destination, "Disabling $jobName")) {
                    Write-Message -Message "Disabling $jobName on $destination" -Level Verbose
                    $destServer.JobServer.Jobs[$serverJob.name].IsEnabled = $False
                    $destServer.JobServer.Jobs[$serverJob.name].Alter()
                }
            }

            if ($DisableOnSource) {
                if ($Pscmdlet.ShouldProcess($source, "Disabling $jobName")) {
                    Write-Message -Message "Disabling $jobName on $source" -Level Verbose
                    $serverJob.IsEnabled = $false
                    $serverJob.Alter()
                }
            }
            $copyJobStatus.Status = "Successful"
            $copyJobStatus
        }
    }
    end {
        Test-DbaDeprecation -DeprecatedOn "1.0.0" -Silent:$false -Alias Copy-SqlJob
    }
}