(feature): hyper-v backup dryRun mode

examples/HyperV-Backup/README.md

@@ -1,7 +1,7 @@
 # Hyper-V Backup Script
 
-**Version:** 1.0.1
-**Last Updated:** 2026-01-26
+**Version:** 1.0.2
+**Last Updated:** 2026-01-28
 
 ## Overview
 
@@ -16,6 +16,7 @@ Production-ready automated backup solution for Hyper-V virtual machines with sch
 - ✅ **Checkpoint Management** - Automatic cleanup of backup checkpoints (keeps last 2 for rollback)
 - ✅ **Space Validation** - Dynamic space checks for temp (per VM) and destination before copy
 - ✅ **VM Exclusion** - Exclude specific VMs from backup
+- ✅ **Dry Run Mode** - Test backup detection without actual export/copy operations
 - ✅ **Detailed Logging** - Comprehensive logging with timestamps and severity levels
 - ✅ **Lock Files** - Prevents concurrent execution
 - ✅ **Error Handling** - Proper exit codes and error reporting
@@ -26,7 +27,7 @@ Production-ready automated backup solution for Hyper-V virtual machines with sch
 - Windows Server with Hyper-V role installed
 - PowerShell 5.1 or later
 - Administrator privileges
-- Hyper-V PowerShell module
+- Hyper-V PowerShell module (auto-installed if missing)
 
 ### Dependencies
 - `SchedulerTemplate.psm1` module (located in parent directory)
@@ -65,7 +66,10 @@ HyperV-Backup/
      "credentialEnvVar": "YOUR_ENV_VAR_NAME",
      "tempExportRoot": "D:\\Temp\\HyperVExport",
      "retentionCount": 3,
-     "excludeVMs": ["vm-to-exclude"]
+     "excludeVMs": ["vm-to-exclude"],
+     "options": {
+       "dryRun": false
+     }
    }
    ```
 
@@ -89,6 +93,8 @@ HyperV-Backup/
    .\hyper-v-backup.bat
    # or
    .\hyper-v-backup.ps1
+
+   # Test with dry run first (set dryRun: true in scriptsettings.json)
    ```
 
 ## Configuration Reference
@@ -112,6 +118,12 @@ HyperV-Backup/
 | `retentionCount` | number | Yes | Number of backup generations to keep (1-365) |
 | `excludeVMs` | array | No | VM names to exclude from backup |
 
+### Options
+
+| Property | Type | Default | Description |
+|----------|------|---------|-------------|
+| `dryRun` | bool | `false` | Simulate backup without exporting or copying VMs |
+
 ### Version Tracking
 
 | Property | Type | Description |
@@ -346,6 +358,14 @@ Run with verbose output:
 - Performance improvement: Skip unnecessary space checks
 - Refactored parameter splatting for Invoke-ScheduledExecution
 
+### 1.0.2 (2026-01-28)
+- Added auto-installation of Hyper-V PowerShell module if missing
+- Removed `#Requires -Modules Hyper-V` directive in favor of runtime installation
+- Module installation uses `Enable-WindowsOptionalFeature` for the Microsoft-Hyper-V-Management-PowerShell feature
+- Handles restart requirement notification if Windows feature installation requires reboot
+- Added dry run mode (`options.dryRun`) to simulate backup without actual export/copy operations
+- Restructured settings to use `options` object for consistency with other scripts
+
 ## Support
 
 For issues or questions:

examples/HyperV-Backup/hyper-v-backup.bat

@@ -3,8 +3,8 @@ setlocal EnableDelayedExpansion
 
 REM ============================================================================
 REM Hyper-V Backup Launcher
-REM VERSION: 1.0.1
-REM DATE: 2026-01-26
+REM VERSION: 1.0.2
+REM DATE: 2026-01-28
 REM DESCRIPTION: Batch file launcher for hyper-v-backup.ps1 with admin check
 REM ============================================================================
 

examples/HyperV-Backup/hyper-v-backup.ps1

@@ -5,7 +5,6 @@ param (
 )
 
 #Requires -RunAsAdministrator
-#Requires -Modules Hyper-V
 
 <#
 .SYNOPSIS
@@ -13,18 +12,18 @@ param (
 .DESCRIPTION
     Production-ready Hyper-V backup solution with scheduling, checkpoints, and retention management.
 .VERSION
-    1.0.1
+    1.0.2
 .DATE
-    2026-01-26
+    2026-01-28
 .NOTES
     - Requires Administrator privileges
-    - Requires Hyper-V PowerShell module
+    - Requires Hyper-V PowerShell module (auto-installed if missing)
     - Requires SchedulerTemplate.psm1 module
 #>
 
 # Script Version
-$ScriptVersion = "1.0.1"
-$ScriptDate = "2026-01-26"
+$ScriptVersion = "1.0.2"
+$ScriptDate = "2026-01-28"
 
 try {
     Import-Module "$PSScriptRoot\..\SchedulerTemplate.psm1" -Force -ErrorAction Stop
@@ -68,6 +67,10 @@ $CredentialEnvVar = $settings.credentialEnvVar
 $TempExportRoot = $settings.tempExportRoot
 $RetentionCount = $settings.retentionCount
 $BlacklistedVMs = $settings.excludeVMs
+$Options = $settings.options
+
+# Get DryRun from settings
+$DryRun = $Options.dryRun
 
 # Schedule Configuration
 $Config = @{
@@ -106,6 +109,44 @@ $script:BackupStats = @{
 
 # Helper Functions =========================================================
 
+function Test-HyperVModule {
+    param([switch]$Automated)
+
+    Write-Log "Checking Hyper-V PowerShell module..." -Level Info -Automated:$Automated
+
+    if (-not (Get-Module -ListAvailable -Name Hyper-V)) {
+        Write-Log "Hyper-V PowerShell module not found. Installing..." -Level Warning -Automated:$Automated
+
+        try {
+            # Install Hyper-V PowerShell module (Windows Feature)
+            $result = Enable-WindowsOptionalFeature -Online -FeatureName Microsoft-Hyper-V-Management-PowerShell -All -NoRestart -ErrorAction Stop
+
+            if ($result.RestartNeeded) {
+                Write-Log "Hyper-V PowerShell module installed but requires system restart" -Level Warning -Automated:$Automated
+                Write-Log "Please restart the system and run the script again" -Level Info -Automated:$Automated
+                return $false
+            }
+
+            Write-Log "Hyper-V PowerShell module installed successfully" -Level Success -Automated:$Automated
+        }
+        catch {
+            Write-Log "Failed to install Hyper-V PowerShell module: $_" -Level Error -Automated:$Automated
+            Write-Log "Please install manually: Enable-WindowsOptionalFeature -Online -FeatureName Microsoft-Hyper-V-Management-PowerShell -All" -Level Info -Automated:$Automated
+            return $false
+        }
+    }
+
+    try {
+        Import-Module Hyper-V -ErrorAction Stop
+        Write-Log "Hyper-V PowerShell module loaded" -Level Success -Automated:$Automated
+        return $true
+    }
+    catch {
+        Write-Log "Failed to import Hyper-V module: $_" -Level Error -Automated:$Automated
+        return $false
+    }
+}
+
 function Test-Prerequisites {
     param([switch]$Automated)
 
@@ -119,8 +160,7 @@ function Test-Prerequisites {
     }
 
     # Check Hyper-V module
-    if (-not (Get-Module -ListAvailable -Name Hyper-V)) {
-        Write-Log "Hyper-V PowerShell module is not installed!" -Level Error -Automated:$Automated
+    if (-not (Test-HyperVModule -Automated:$Automated)) {
         return $false
     }
 
@@ -332,6 +372,15 @@ function Backup-VM {
             Write-Log "Temp drive ${tempDrive}: has $([math]::Round($freeSpace / 1GB, 2)) GB free" -Level Info -Automated:$Automated
         }
 
+        # Dry run mode - skip actual backup operations
+        if ($DryRun) {
+            Write-Log "DRY RUN: Would export VM '$VMName' to temp location" -Level Warning -Automated:$Automated
+            Write-Log "DRY RUN: Would copy export to backup location: $vmBackupPath" -Level Warning -Automated:$Automated
+            Write-Log "=== DRY RUN: Backup simulated for VM: $VMName ===" -Level Warning -Automated:$Automated
+            $script:BackupStats.SkippedVMs++
+            return $true
+        }
+
         # Export VM to temp location (Export-VM creates its own checkpoint internally)
         $tempExportPath = Join-Path -Path $TempExportRoot -ChildPath "$VMName-$DateSuffix"
         Write-Log "Exporting VM '$VMName' to temp location: $tempExportPath" -Level Info -Automated:$Automated
@@ -558,6 +607,9 @@ function Start-BusinessLogic {
     Write-Log "Hyper-V Backup Process Started" -Level Info -Automated:$Automated
     Write-Log "Script Version: $ScriptVersion ($ScriptDate)" -Level Info -Automated:$Automated
     Write-Log "Host: $Hostname" -Level Info -Automated:$Automated
+    if ($DryRun) {
+        Write-Log "DRY RUN MODE - No changes will be made" -Level Warning -Automated:$Automated
+    }
     Write-Log "========================================" -Level Info -Automated:$Automated
 
     # Check prerequisites
@@ -606,6 +658,10 @@ function Start-BusinessLogic {
     $dateSuffix = Get-Date -Format "yyyyMMddHHmmss"
     $backupFolder = Join-Path -Path $BackupPath -ChildPath $dateSuffix
 
+    if ($DryRun) {
+        Write-Log "DRY RUN: Would create backup folder: $backupFolder" -Level Warning -Automated:$Automated
+    }
+    else {
         try {
             New-Item -Path $backupFolder -ItemType Directory -Force -ErrorAction Stop | Out-Null
             Write-Log "Created backup folder: $backupFolder" -Level Success -Automated:$Automated
@@ -614,6 +670,7 @@ function Start-BusinessLogic {
             Write-Log "Failed to create backup folder '$backupFolder': $_" -Level Error -Automated:$Automated
             exit 1
         }
+    }
 
     # Process each VM
     foreach ($vm in $vms) {
@@ -628,11 +685,21 @@ function Start-BusinessLogic {
         Backup-VM -VMName $vmName -BackupFolder $backupFolder -DateSuffix $dateSuffix -Automated:$Automated
     }
 
-    # Cleanup old checkpoints
+    # Cleanup old checkpoints (skip in dry run mode)
+    if ($DryRun) {
+        Write-Log "DRY RUN: Skipping checkpoint cleanup" -Level Warning -Automated:$Automated
+    }
+    else {
         Remove-OldCheckpoints -VMs $vms -Automated:$Automated
+    }
 
-    # Cleanup old backups
+    # Cleanup old backups (skip in dry run mode)
+    if ($DryRun) {
+        Write-Log "DRY RUN: Skipping old backup cleanup" -Level Warning -Automated:$Automated
+    }
+    else {
         Remove-OldBackups -BackupPath $BackupPath -RetentionCount $RetentionCount -Automated:$Automated
+    }
 
     # Print summary
     Write-BackupSummary -Automated:$Automated

examples/HyperV-Backup/scriptsettings.json

@@ -2,8 +2,8 @@
   "$schema": "https://json-schema.org/draft-07/schema",
   "title": "Hyper-V Backup Script Settings",
   "description": "Configuration file for hyper-v-backup.ps1 script",
-  "version": "1.0.1",
-  "lastModified": "2026-01-26",
+  "version": "1.0.2",
+  "lastModified": "2026-01-28",
   "schedule": {
     "runMonth": [],
     "runWeekday": ["Monday"],
@@ -15,6 +15,9 @@
   "tempExportRoot": "D:\\Temp\\HyperVExport",
   "retentionCount": 3,
   "excludeVMs": ["nassrv0002"],
+  "options": {
+    "dryRun": false
+  },
   "_comments": {
     "version": "Configuration schema version",
     "lastModified": "Last modification date (YYYY-MM-DD)",
@@ -28,6 +31,9 @@
     "credentialEnvVar": "Name of Machine-level environment variable containing Base64-encoded 'username:password'",
     "tempExportRoot": "Local directory for temporary VM exports. Space is checked dynamically per VM (1.5x VM size).",
     "retentionCount": "Number of backup generations to keep (1-365). Older backups are automatically deleted.",
-    "excludeVMs": "Array of VM names to exclude from backup process"
+    "excludeVMs": "Array of VM names to exclude from backup process",
+    "options": {
+      "dryRun": "Simulate backup without actually exporting or copying VMs"
+    }
   }
 }