47 lines
1.3 KiB
PowerShell
47 lines
1.3 KiB
PowerShell
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# Requires running PowerShell as Administrator
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# Define the GUID for the EFI global variable
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$EFI_GLOBAL_GUID = "{8BE4DF61-93CA-11D2-AA0D-00E098032B8C}"
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# NixOS boot entry ID
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$NixOSBootEntryID = "0002"
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# Convert the Boot Entry ID to a byte array
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$BootNextValue = [UInt16]::Parse($NixOSBootEntryID, "AllowHexSpecifier")
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$BootNextBytes = [BitConverter]::GetBytes($BootNextValue)
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# Define the SetFirmwareEnvironmentVariable function
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$SetFirmwareEnvironmentVariable = @"
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using System;
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using System.Runtime.InteropServices;
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public class UEFI
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{
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[DllImport("kernel32.dll", SetLastError = true, CharSet = CharSet.Unicode)]
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public static extern bool SetFirmwareEnvironmentVariable(
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string lpName,
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string lpGuid,
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byte[] pValue,
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int nSize
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);
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}
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"@
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Add-Type -TypeDefinition $SetFirmwareEnvironmentVariable
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# Set the BootNext variable
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$success = [UEFI]::SetFirmwareEnvironmentVariable(
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"BootNext",
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$EFI_GLOBAL_GUID,
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$BootNextBytes,
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$BootNextBytes.Length
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)
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if ($success) {
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Write-Host "BootNext variable set successfully to Boot$NixOSBootEntryID."
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# reboot to nixos
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Write-Host "Rebooting to NixOS..."
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Restart-Computer -Force
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} else {
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$errorCode = [Runtime.InteropServices.Marshal]::GetLastWin32Error()
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Write-Host "Failed to set BootNext variable. Error code: $errorCode"
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}
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