BREAKING CHANGE: xScheduledTask: Add support for disabling built-in tasks - Fixes #74

DSCResources/MSFT_xScheduledTask/MSFT_xScheduledTask.psm1

@@ -220,7 +220,7 @@ function Get-TargetResource
         [System.String]
         $Description,
 
-        [Parameter(Mandatory = $true)]
+        [Parameter()]
         [System.String]
         $ActionExecutable,
 
@@ -232,7 +232,7 @@ function Get-TargetResource
         [System.String]
         $ActionWorkingPath,
 
-        [Parameter(Mandatory = $true)]
+        [Parameter()]
         [System.String]
         [ValidateSet('Once', 'Daily', 'Weekly', 'AtStartup', 'AtLogOn')]
         $ScheduleType,
@@ -390,10 +390,9 @@ function Get-TargetResource
         Write-Verbose -Message ($script:localizedData.TaskNotFoundMessage -f $TaskName, $TaskPath)
 
         return @{
-            TaskName         = $TaskName
-            ActionExecutable = $ActionExecutable
-            Ensure           = 'Absent'
-            ScheduleType     = $ScheduleType
+            TaskName = $TaskName
+            TaskPath = $TaskPath
+            Ensure   = 'Absent'
         }
     }
     else
@@ -685,7 +684,7 @@ function Set-TargetResource
         [System.String]
         $Description,
 
-        [Parameter(Mandatory = $true)]
+        [Parameter()]
         [System.String]
         $ActionExecutable,
 
@@ -697,7 +696,7 @@ function Set-TargetResource
         [System.String]
         $ActionWorkingPath,
 
-        [Parameter(Mandatory = $true)]
+        [Parameter()]
         [System.String]
         [ValidateSet('Once', 'Daily', 'Weekly', 'AtStartup', 'AtLogOn')]
         $ScheduleType,
@@ -861,6 +860,21 @@ function Set-TargetResource
 
     if ($Ensure -eq 'Present')
     {
+        <#
+            If the scheduled task already exists and is enabled but it needs to be disabled
+            and the action executable isn't specified then disable the task
+        #>
+        if ($currentValues.Ensure -eq 'Present' `
+            -and $currentValues.Enable `
+            -and -not $Enable `
+            -and -not $PSBoundParameters.ContainsKey('ActionExecutable'))
+        {
+            Write-Verbose -Message ($script:localizedData.DisablingExistingScheduledTask -f $TaskName, $TaskPath)
+            Disable-ScheduledTask -TaskName $TaskName -TaskPath $TaskPath
+
+            return
+        }
+
         if ($RepetitionDuration -lt $RepeatInterval)
         {
             New-InvalidArgumentException `
@@ -889,6 +903,7 @@ function Set-TargetResource
                 -ArgumentName DaysOfWeek
         }
 
+        # Configure the action
         $actionParameters = @{
             Execute = $ActionExecutable
         }
@@ -905,6 +920,11 @@ function Set-TargetResource
 
         $action = New-ScheduledTaskAction @actionParameters
 
+        $scheduledTaskArguments += @{
+            Action = $action
+        }
+
+        # Configure the settings
         $settingParameters = @{
             DisallowDemandStart             = $DisallowDemandStart
             DisallowHardTerminate           = $DisallowHardTerminate
@@ -952,6 +972,10 @@ function Set-TargetResource
 
         $setting = New-ScheduledTaskSettingsSet @settingParameters
 
+        $scheduledTaskArguments += @{
+            Settings = $setting
+        }
+
         <#
             On Windows Server 2012 R2 setting a blank timespan for ExecutionTimeLimit
             does not result in the PT0S timespan value being set. So set this
@@ -963,6 +987,7 @@ function Set-TargetResource
             $setting.ExecutionTimeLimit = 'PT0S'
         }
 
+        # Configure the trigger
         $triggerParameters = @{}
 
         if ($RandomDelay -gt [System.TimeSpan]::FromSeconds(0))
@@ -1098,6 +1123,10 @@ function Set-TargetResource
             }
         }
 
+        $scheduledTaskArguments += @{
+            Trigger = $trigger
+        }
+
         # Prepare the register arguments
         $registerArguments = @{
             TaskName = $TaskName
@@ -1146,10 +1175,7 @@ function Set-TargetResource
 
         $principal = New-ScheduledTaskPrincipal @principalArguments
 
-        $scheduledTaskArguments = @{
-            Action    = $action
-            Trigger   = $trigger
-            Settings  = $setting
+        $scheduledTaskArguments += @{
             Principal = $principal
         }
 
@@ -1363,7 +1389,7 @@ function Test-TargetResource
         [System.String]
         $Description,
 
-        [Parameter(Mandatory = $true)]
+        [Parameter()]
         [System.String]
         $ActionExecutable,
 
@@ -1375,7 +1401,7 @@ function Test-TargetResource
         [System.String]
         $ActionWorkingPath,
 
-        [Parameter(Mandatory = $true)]
+        [Parameter()]
         [System.String]
         [ValidateSet('Once', 'Daily', 'Weekly', 'AtStartup', 'AtLogOn')]
         $ScheduleType,
@@ -1726,3 +1752,32 @@ function ConvertTo-TimeSpanStringFromScheduledTaskString
 
     return (New-TimeSpan -Days $days -Hours $hours -Minutes $minutes -Seconds $seconds).ToString()
 }
+
+<#
+    .SYNOPSIS
+        Helper function to disable an existing scheduled task.
+
+    .PARAMETER TaskName
+        The name of the task to disable.
+
+    .PARAMETER TaskPath
+        The path to the task to disable.
+#>
+function Disable-ScheduledTask
+{
+    [CmdletBinding()]
+    param
+    (
+        [Parameter(Mandatory = $true)]
+        [System.String]
+        $TaskName,
+
+        [Parameter()]
+        [System.String]
+        $TaskPath = '\'
+    )
+
+    $existingTask = Get-ScheduledTask @PSBoundParameters
+    $existingTask.Settings.Enabled = $false
+    $null = $existingTask | Register-ScheduledTask @PSBoundParameters -Force
+}

DSCResources/MSFT_xScheduledTask/MSFT_xScheduledTask.schema.mof

@@ -4,10 +4,10 @@ class MSFT_xScheduledTask : OMI_BaseResource
     [Key, Description("The name of the task")] string TaskName;
     [Write, Description("The path to the task - defaults to the root directory")] string TaskPath;
     [Write, Description("The task description")] string Description;
-    [Required, Description("The path to the .exe for this task")] string ActionExecutable;
+    [Write, Description("The path to the .exe for this task")] string ActionExecutable;
     [Write, Description("The arguments to pass the executable")] string ActionArguments;
     [Write, Description("The working path to specify for the executable")] string ActionWorkingPath;
-    [Required, Description("When should the task be executed"), ValueMap{"Once", "Daily", "Weekly", "AtStartup", "AtLogOn"}, Values{"Once", "Daily", "Weekly", "AtStartup", "AtLogOn"}] string ScheduleType;
+    [Write, Description("When should the task be executed"), ValueMap{"Once", "Daily", "Weekly", "AtStartup", "AtLogOn"}, Values{"Once", "Daily", "Weekly", "AtStartup", "AtLogOn"}] string ScheduleType;
     [Write, Description("How many units (minutes, hours, days) between each run of this task?")] String RepeatInterval;
     [Write, Description("The time of day this task should start at - defaults to 12:00 AM. Not valid for AtLogon and AtStartup tasks")] DateTime StartTime;
     [Write, Description("Present if the task should exist, Absent if it should be removed"), ValueMap{"Present","Absent"}, Values{"Present","Absent"}] string Ensure;

DSCResources/MSFT_xScheduledTask/en-US/MSFT_xScheduledTask.strings.psd1

@@ -5,6 +5,7 @@ ConvertFrom-StringData @'
     TriggerTypeError = Trigger type '{0}' not recognized.
     DetectedScheduleTypeMessage = Detected schedule type '{0}' for first trigger.
     SetScheduledTaskMessage = Setting scheduled task '{0}' in '{1}'.
+    DisablingExistingScheduledTask = Disabling existing scheduled task '{0}' in '{1}'.
     RepetitionDurationLessThanIntervalError = Repetition duration '{0}' is less than repetition interval '{1}'. Please set RepeatInterval to a value lower or equal to RepetitionDuration.
     DaysIntervalError = DaysInterval must be greater than zero (0) for Daily schedules. DaysInterval specified is '{0}'.
     WeeksIntervalError = WeeksInterval must be greater than zero (0) for Weekly schedules. WeeksInterval specified is '{0}'.

Examples/xScheduledTask/11-DisableABuiltInTask.ps1

@@ -0,0 +1,26 @@
+<#
+    .EXAMPLE
+    This example disables the built-in scheduled task called
+    'CreateExplorerShellUnelevatedTask'.
+#>
+Configuration Example
+{
+    param
+    (
+        [Parameter()]
+        [System.String[]]
+        $NodeName = 'localhost'
+    )
+
+    Import-DscResource -ModuleName xComputerManagement
+
+    Node $NodeName
+    {
+        xScheduledTask DisableCreateExplorerShellUnelevatedTask
+        {
+            TaskName            = 'CreateExplorerShellUnelevatedTask'
+            TaskPath            = '\'
+            Enable              = $false
+        }
+    }
+}

Examples/xScheduledTask/12-DeleteABuiltInTask.ps1

@@ -0,0 +1,26 @@
+<#
+    .EXAMPLE
+    This example deletes the built-in scheduled task called
+    'CreateExplorerShellUnelevatedTask'.
+#>
+Configuration Example
+{
+    param
+    (
+        [Parameter()]
+        [System.String[]]
+        $NodeName = 'localhost'
+    )
+
+    Import-DscResource -ModuleName xComputerManagement
+
+    Node $NodeName
+    {
+        xScheduledTask DeleteCreateExplorerShellUnelevatedTask
+        {
+            TaskName            = 'CreateExplorerShellUnelevatedTask'
+            TaskPath            = '\'
+            Ensure              = 'Absent'
+        }
+    }
+}

README.md

@@ -182,6 +182,8 @@ xScheduledTask has the following properties:
 * [Run a PowerShell script every 15 minutes indefinitely on a server](/Examples/xScheduledTask/8-RunPowerShellTaskEvery15MinutesIndefinitely.ps1)
 * [Run a PowerShell script once as a specified user with highest privileges](/Examples/xScheduledTask/9-RunPowerShellTaskOnceAsUserWithHighestPriveleges.ps1)
 * [Run a PowerShell script once as a specified user only when the user is logged on](/Examples/xScheduledTask/10-RunPowerShellTaskOnceAsUserInteractiveOnly.ps1)
+* [Disable a built-in scheduled task](/Examples/xScheduledTask/11-DisableABuiltInTask.ps1)
+* [Delete a built-in scheduled task](/Examples/xScheduledTask/12-DeleteABuiltInTask.ps1)
 
 ## xPowerPlan
 
@@ -217,7 +219,14 @@ xVirtualMemory has the following properties:
 
 ### Unreleased
 
+* BREAKING CHANGE: xScheduledTask:
+  * Breaking change because `Get-TargetResource` no longer outputs
+    `ActionExecutable` and `ScheduleType` properties when the scheduled
+    task does not exist. It will also include `TaskPath` in output when
+    scheduled task does not exist.
 * xScheduledTask:
+  * Add support to disable built-in scheduled tasks - See [Issue #74](https://github.com/PowerShell/xComputerManagement/issues/74).
+  * Fix unit test mocked schedule task object structure.
   * Fix error message when trigger type is unknown - See [Issue #121](https://github.com/PowerShell/xComputerManagement/issues/121).
   * Moved strings into separate strings file.
   * Updated to meet HQRM guidelines.

Tests/Integration/MSFT_xScheduledTask.Config.ps1

@@ -424,3 +424,31 @@ Configuration xScheduledTaskExecuteAsDel
         }
     }
 }
+
+Configuration xScheduledTaskDisableBuiltIn
+{
+    Import-DscResource -ModuleName xComputerManagement
+    node 'localhost'
+    {
+        xScheduledTask xScheduledTaskDisableBuiltIn
+        {
+            TaskName              = 'Test task builtin'
+            TaskPath              = '\xComputerManagement\'
+            Enable                = $false
+        }
+    }
+}
+
+Configuration xScheduledTaskRemoveBuiltIn
+{
+    Import-DscResource -ModuleName xComputerManagement
+    node 'localhost'
+    {
+        xScheduledTask xScheduledTaskRemoveBuiltIn
+        {
+            TaskName              = 'Test task builtin'
+            TaskPath              = '\xComputerManagement\'
+            Ensure                = 'Absent'
+        }
+    }
+}