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‎src/windows/sac-enabler.ps1‎

Lines changed: 32 additions & 32 deletions
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Name: sac-enabler.ps1
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Author: Tony.Mocanu@Microsoft.com
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Last Modified: 2026-08-06
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Version: 1.6.1
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Version: 1.3
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Requirement: Azure repair VM with an attached Windows OS disk
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DeployMode: az vm repair run (with --run-on-repair)
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.VERSION
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v1.6.1: [August 2026] - Repairs loader device/osdevice when they render as unknown.
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- Writes the validated Windows partition while the source retains its original GPT identity.
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- Re-queries and verifies the repaired loader mapping before enabling EMS.
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v1.6.0: [August 2026] - Preserves the Gen2 source disk GPT GUID for the entire repair.
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- Resolves a GPT collision by temporarily changing only the disposable repair VM OS disk GUID.
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- Offlines the source disk before restoring and verifying the repair OS disk GUID.
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v1.5.9: [August 2026] - Refuses to rewrite a collision-offlined GPT disk identity.
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- Requires a non-colliding repair OS disk or matching-generation nested repair for Gen2.
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v1.5.8: [August 2026] - Rebinds embedded BCD WMI results through their documented key properties.
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- Avoids invalid ManagementBaseObject-to-ManagementObject casts.
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v1.5.7: [August 2026] - Uses typed BCD WMI element setters instead of BCDEdit for writes.
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- Prevents unrelated GPT device descriptors from being reserialized under a temporary identity.
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v1.5.6: [August 2026] - Temporarily assigns a unique identity to collision-offlined attached disks.
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- Restores and verifies the exact original disk identity before reporting success.
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v1.5.5: [August 2026] - Refuses repair when an attached disk is offline due to an identity collision.
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- Prevents onlining a colliding source disk and invalidating BCD device references.
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v1.5.4: [August 2026] - Skips EMS writes for settings that are already correct.
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- Logs the full verbose BCD store before and after changes.
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v1.5.3: [August 2026] - Uses only the documented offline EMS and EMS settings commands.
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- Does not enable the optional Windows boot menu or Boot Manager EMS.
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v1.5.2: [August 2026] - Restores the verified BCD backup after any post-write failure.
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- Preserves device and osdevice mappings without normalization.
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v1.5.1: [August 2026] - Avoids comparing guest BCD drive letters with repair-VM mount letters.
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- Uses VM generation when selecting the detected loader path for logging.
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v1.5: [August 2026] - Validates loader mapping before BCD writes and verifies mapping invariance afterward.
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v1.3: [August 2026] - Repairs loader device/osdevice when they render as unknown.
29+
- Writes the validated Windows partition while the source retains its original GPT identity.
30+
- Re-queries and verifies the repaired loader mapping before enabling EMS.
31+
- Preserves the Gen2 source disk GPT GUID for the entire repair.
32+
- Resolves a GPT collision by temporarily changing only the disposable repair VM OS disk GUID.
33+
- Offlines the source disk before restoring and verifying the repair OS disk GUID.
34+
- Refuses to rewrite a collision-offlined GPT disk identity.
35+
- Requires a non-colliding repair OS disk or matching-generation nested repair for Gen2.
36+
- Rebinds embedded BCD WMI results through their documented key properties.
37+
- Avoids invalid ManagementBaseObject-to-ManagementObject casts.
38+
- Uses typed BCD WMI element setters instead of BCDEdit for writes.
39+
- Prevents unrelated GPT device descriptors from being reserialized under a temporary identity.
40+
- Temporarily assigns a unique identity to collision-offlined attached disks.
41+
- Restores and verifies the exact original disk identity before reporting success.
42+
- Refuses repair when an attached disk is offline due to an identity collision.
43+
- Prevents onlining a colliding source disk and invalidating BCD device references.
44+
- Skips EMS writes for settings that are already correct.
45+
- Logs the full verbose BCD store before and after changes.
46+
- Uses only the documented offline EMS and EMS settings commands.
47+
- Does not enable the optional Windows boot menu or Boot Manager EMS.
48+
- Restores the verified BCD backup after any post-write failure.
49+
- Preserves device and osdevice mappings without normalization.
50+
- Avoids comparing guest BCD drive letters with repair-VM mount letters.
51+
- Uses VM generation when selecting the detected loader path for logging.
52+
- Validates loader mapping before BCD writes and verifies mapping invariance afterward.
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- Requires and verifies a BCD backup before applying SAC settings.
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- Restores the backup if path, device, osdevice, or systemroot changes unexpectedly.
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v1.4: [August 2026] - Added VMRepairMint telemetry, structured before-state capture, and Gen1/Gen2 discovery telemetry.
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- Added VMRepairMint telemetry, structured before-state capture, and Gen1/Gen2 discovery telemetry.
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- Added explicit winload.exe and winload.efi detection.
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- Added explicit displayorder and boot entry GUID failure diagnostics.
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Update [July 2026] - Restricted execution to repair VM mode.
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- Restricted execution to repair VM mode.
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- Uses Get-Disk-Partitions to enumerate Azure virtual disks.
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- Detects repair vs. standard context from secondary disks returned by the helper.
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- Mounts unlettered Gen2 Windows and EFI partitions temporarily.
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- Probes unlettered partitions directly instead of assuming GPT metadata or size.
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- Refuses BCD changes when a repair VM context is not detected.
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- Fails closed if the repair VM OS disk cannot be identified.
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- Filters out the repair VM OS disk before processing attached disks.
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Update: [July 2026] - Added execution context detection and dual-logging.
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- Added execution context detection and dual-logging.
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- Detected rescue VM mode versus standard mode for context-aware error messages.
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- Logs to both the desktop and the plugin directory for automatic collection by az vm repair.
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- **NEW SAFETY: Pre-flight checks, BCD backup, and post-change verification.
@@ -487,7 +487,7 @@ function Log-Debug {
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}
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# Structured telemetry is written through the existing dual-write logging path.
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$script:RepairScriptVersion = '1.6.1'
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$script:RepairScriptVersion = '1.3'
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$script:ExecutionStarted = Get-Date
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$script:OperationCount = 0
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$script:LastCommand = $null
@@ -707,15 +707,15 @@ $gptCollisionDiskNumbers = @()
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$repairDiskIdentityRecord = $null
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Log-Info "Starting repair-only SAC enabler. Logs: $logFile"
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Log-Info "Build marker: v1.6.1-repair-unknown-loader-device"
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Log-Info "Build marker: v1.3-repair-unknown-loader-device"
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# VMRepairMint telemetry marker
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Log-Info "[script_start] Script=sac-enabler Version=$($script:RepairScriptVersion)"
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Write-SacTelemetry -Event Start -Message 'script_start' -Properties @{
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ScriptName = 'sac-enabler.ps1'
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ScriptVersion = $script:RepairScriptVersion
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BuildMarker = 'v1.6.1-repair-unknown-loader-device'
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BuildMarker = 'v1.3-repair-unknown-loader-device'
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StartTimeUtc = (Get-Date).ToUniversalTime().ToString('o')
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}
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