README.md

@@ -6,7 +6,7 @@ WFVM
 A Nix library to create and manage virtual machines running Windows, a medieval operating system found on most computers in 2020. The F stands for "Functional" or a four-letter word of your choice.
 
 * Reproducible - everything runs in the Nix sandbox with no tricks.
-* Fully automatic, parameterizable Windows 11 installation.
+* Fully automatic, parameterizable Windows 10 installation.
 * Uses QEMU with KVM.
 * Supports incremental installation (using "layers") of additional software via QEMU copy-on-write backing chains. For example, ``wfvm.makeWindowsImage { installCommands = [ wfvm.layers.anaconda3 ]; };`` gives you a VM image with Anaconda3 installed, and ``wfvm.makeWindowsImage { installCommands = [ wfvm.layers.anaconda3 wfvm.layers.msys2 ]; };`` gives you one with both Anaconda3 and MSYS2 installed. The base Windows installation and the Anaconda3 data are shared between both images, and only the MSYS2 installation is performed when building the second image after the first one has been built.
 * Included layers: Anaconda3, a software installer chock full of bugs that pretends to be a package manager, Visual Studio, a spamming system for Microsoft accounts that includes a compiler, and MSYS2, which is the only sane component in the whole lot.
@@ -52,30 +52,3 @@ Impure/pure mode
 Sometimes it can be useful to build the image _outside_ of the Nix sandbox for debugging purposes.
 
 For this purpose we have an attribute called `impureMode` which outputs the shell script used by Nix inside the sandbox to build the image.
-
-
-Usage with Nix Flakes
----------------------
-
-Build the demo by running:
-```shell
-nix build .#demoImage
-```
-
-This project's **flake.nix** exposes its functions under `lib`. To use
-in your own project, setup your flake like this:
-
-```nix
-{
-  inputs = {
-    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
-    wfvm.url = "git+https://git.m-labs.hk/m-labs/wfvm";
-  };
-
-  outputs = { self, nixpkgs, wfvm }: {
-    packages."x86_64-linux".flaky-os = wfvm.lib.makeWindowsImage {
-      # configuration parameters go here
-    };
-  };
-}
-```

flake.lock

@@ -1,27 +0,0 @@
-{
-  "nodes": {
-    "nixpkgs": {
-      "locked": {
-        "lastModified": 1685004253,
-        "narHash": "sha256-AbVL1nN/TDicUQ5wXZ8xdLERxz/eJr7+o8lqkIOVuaE=",
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "3e01645c40b92d29f3ae76344a6d654986a91a91",
-        "type": "github"
-      },
-      "original": {
-        "owner": "NixOS",
-        "ref": "nixos-23.05",
-        "repo": "nixpkgs",
-        "type": "github"
-      }
-    },
-    "root": {
-      "inputs": {
-        "nixpkgs": "nixpkgs"
-      }
-    }
-  },
-  "root": "root",
-  "version": 7
-}

flake.nix

@@ -1,37 +0,0 @@
-{
-  description = "WFVM: Windows Functional Virtual Machine";
-
-  inputs = {
-    nixpkgs.url = "github:NixOS/nixpkgs/nixos-23.05";
-  };
-
-  outputs = { self, nixpkgs }:
-    let
-      # only x64 is supported
-      system = "x86_64-linux";
-
-      pkgs = nixpkgs.legacyPackages.${system};
-
-    in rec {
-      lib = import ./wfvm {
-        inherit pkgs;
-      };
-
-      packages.${system} = rec {
-        demoImage = import ./wfvm/demo-image.nix {
-          inherit self;
-        };
-
-        default = lib.utils.wfvm-run {
-          name = "demo";
-          image = demoImage;
-          script =
-            ''
-            echo "Windows booted. Press Enter to terminate VM."
-            read
-            '';
-          display = true;
-        };
-      };
-    };
-}

wfvm/autounattend.nix

@@ -15,8 +15,6 @@
 , impureShellCommands ? []
 , driveLetter ? "D:"
 , efi ? true
-, imageSelection ? "Windows 11 Pro N"
-, enableTpm
 , ...
 }:
 
@@ -51,28 +49,34 @@ let
     # mkDirsDesc ++ writeKeysDesc ++
   [
     {
-      Path = ''powershell.exe ${driveLetter}\install-ssh.ps1'';
+      Path = ''powershell.exe Add-WindowsCapability -Online -Name OpenSSH.Server~~~~0.0.1.0 -Source ${driveLetter}\fod -LimitAccess'';
-      Description = "Install OpenSSH service.";
+      Description = "Add OpenSSH service.";
+    }
+    {
+      Path = ''powershell.exe Set-Service -Name sshd -StartupType Automatic'';
+      Description = "Enable SSH by default.";
     }
   ];
 
   assertCommand = c: builtins.typeOf c == "string" || builtins.typeOf c == "set" && builtins.hasAttr "Path" c && builtins.hasAttr "Description" c;
 
   commands = builtins.map (x: assert assertCommand x; if builtins.typeOf x == "string" then { Path = x; Description = x; } else x) (
-    [ {
+    [
+      {
         Path = "powershell.exe Set-ExecutionPolicy -Force Unrestricted";
         Description = "Allow unsigned powershell scripts.";
-    } {
+      }
+    ]
+    ++ [
+      {
         Path = ''powershell.exe ${driveLetter}\win-bundle-installer.exe'';
         Description = "Install any declared packages.";
-    } {
+      }
-      Path = "net accounts /maxpwage:unlimited";
+    ]
-      Description = "Disable forced password expiry.";
-    } ]
     ++ setupCommands
     ++ [
       {
-        Path = ''powershell.exe ${driveLetter}\setup.ps1'';
+        Path = ''powershell.exe ${driveLetter}\ssh-setup.ps1'';
         Description = "Setup SSH and keys";
       }
     ]
@@ -147,14 +151,6 @@ let
           </DriverPaths>
         </component>
         <component name="Microsoft-Windows-Setup" processorArchitecture="amd64" publicKeyToken="31bf3856ad364e35" language="neutral" versionScope="nonSxS" xmlns:wcm="http://schemas.microsoft.com/WMIConfig/2002/State" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
-          ${lib.optionalString (!enableTpm) ''
-            <RunSynchronous>
-              <RunSynchronousCommand wcm:action="add">
-                <Order>1</Order>
-                <Path>reg add HKLM\System\Setup\LabConfig /v BypassTPMCheck /t reg_dword /d 0x00000001 /f</Path>
-              </RunSynchronousCommand>
-            </RunSynchronous>
-          ''}
 
           <DiskConfiguration>
             <Disk wcm:action="add">
@@ -206,10 +202,9 @@ let
                 <PartitionID>3</PartitionID>
               </InstallTo>
               <InstallFrom>
-                <Path>\install.swm</Path>
                 <MetaData wcm:action="add">
-                  <Key>/IMAGE/NAME</Key>
+                  <Key>/IMAGE/INDEX</Key>
-                  <Value>${imageSelection}</Value>
+                  <Value>1</Value>
                 </MetaData>
               </InstallFrom>
             </OSImage>
@@ -217,7 +212,7 @@ let
 
           <UserData>
             <ProductKey>
-              ${if productKey != null then "<Key>${productKey}</Key>" else "<Key/>"}
+              ${if productKey != null then "<Key>${productKey}</Key>" else ""}
               <WillShowUI>OnError</WillShowUI>
             </ProductKey>
             <AcceptEula>true</AcceptEula>
@@ -307,18 +302,18 @@ let
         </component>
       </settings>
 
-       <cpi:offlineImage cpi:source="wim:c:/wim/windows-11/install.wim#${imageSelection}" xmlns:cpi="urn:schemas-microsoft-com:cpi" />
+      <cpi:offlineImage cpi:source="wim:c:/wim/windows-10/install.wim#Windows 10 Enterprise LTSC 2019 Evaluation" xmlns:cpi="urn:schemas-microsoft-com:cpi" />
     </unattend>
   '';
 
 in {
   # Lint and format as a sanity check
-  autounattendXML = pkgs.runCommand "autounattend.xml" {} ''
+  autounattendXML = pkgs.runCommandNoCC "autounattend.xml" {} ''
     ${pkgs.libxml2}/bin/xmllint --format ${autounattendXML} > $out
   '';
 
   # autounattend.xml is _super_ picky about quotes and other things
-  setupScript = pkgs.writeText "setup.ps1" (
+  setupScript = pkgs.writeText "ssh-setup.ps1" (
     ''
       # Setup SSH and keys
     '' +

wfvm/bundle/default.nix

@@ -1,10 +1,7 @@
 { pkgs }:
 
-pkgs.runCommand "win-bundle-installer.exe" {} ''
+pkgs.runCommandNoCC "win-bundle-installer.exe" {} ''
-  mkdir bundle
-  cd bundle
-  cp ${./go.mod} go.mod
   cp ${./main.go} main.go
   env HOME=$(mktemp -d) GOOS=windows GOARCH=amd64 ${pkgs.go}/bin/go build
-  mv bundle.exe $out
+  mv build.exe $out
 ''

wfvm/bundle/go.mod

@@ -1,3 +0,0 @@
-module bundle
-
-go 1.11

wfvm/default.nix

@@ -2,6 +2,6 @@
 
 {
   makeWindowsImage = attrs: import ./win.nix ({ inherit pkgs; } // attrs);
-  layers = import ./layers { inherit pkgs; };
+  layers = (import ./layers { inherit pkgs; });
-  utils = import ./utils.nix { inherit pkgs; };
+  utils = (import ./utils.nix { inherit pkgs; });
 }

wfvm/demo-image.nix

@@ -1,27 +1,16 @@
-{ pkgs ? import <nixpkgs> {}
+{ pkgs ? import <nixpkgs> {}, impureMode ? false }:
-# Whether to generate just a script to start and debug the windows installation
-, impureMode ? false
-# Flake input `self`
-, self ? null
-}:
 
 let
-  wfvm =
+  wfvm = (import ./default.nix { inherit pkgs; });
-    if self == null
-    # nix-build
-    then (import ./default.nix { inherit pkgs; })
-    # built from flake.nix
-    else self.lib;
 in
 wfvm.makeWindowsImage {
   # Build install script & skip building iso
   inherit impureMode;
 
   # Custom base iso
-  # windowsImage = pkgs.requireFile rec {
+  # windowsImage = pkgs.fetchurl {
-  #   name = "Win11_22H2_English_x64v1.iso";
+  #   url = "https://software-download.microsoft.com/download/sg/17763.107.101029-1455.rs5_release_svc_refresh_CLIENT_LTSC_EVAL_x64FRE_en-us.iso";
-  #   sha256 = "08mbppsm1naf73z8fjyqkf975nbls7xj9n4fq0yp802dv1rz3whd";
+  #   sha256 = "668fe1af70c2f7416328aee3a0bb066b12dc6bbd2576f40f812b95741e18bc3a";
-  #   message = "Get disk image ${name} from https://www.microsoft.com/en-us/software-download/windows11/";
   # };
 
   # impureShellCommands = [
@@ -57,7 +46,7 @@ wfvm.makeWindowsImage {
         disable-autolock
         disable-firewall
       ])
-      anaconda3 msys2
+      anaconda3 msys2 msvc msvc-ide-unbreak
     ];
 
   # services = {
@@ -68,10 +57,8 @@ wfvm.makeWindowsImage {
   #   };
   # };
 
-  # License key (required)
+  # License key
-  # productKey = throw "Search the f* web"
+  # productKey = "iboughtthisone";
-  imageSelection = "Windows 11 Pro N";
-
 
   # Locales
   # uiLanguage = "en-US";

wfvm/install-ssh.ps1

@@ -1,42 +0,0 @@
-Write-Host "Expanding OpenSSH"
-Expand-Archive D:\OpenSSH-Win64.zip C:\
-
-Push-Location C:\OpenSSH-Win64
-
-Write-Host "Installing OpenSSH"
-& .\install-sshd.ps1
-
-Write-Host "Generating host keys"
-.\ssh-keygen.exe -A
-
-Write-Host "Fixing host file permissions"
-& .\FixHostFilePermissions.ps1 -Confirm:$false
-
-Write-Host "Fixing user file permissions"
-& .\FixUserFilePermissions.ps1 -Confirm:$false
-
-Pop-Location
-
-$newPath = 'C:\OpenSSH-Win64;' + [Environment]::GetEnvironmentVariable("PATH", [EnvironmentVariableTarget]::Machine)
-[Environment]::SetEnvironmentVariable("PATH", $newPath, [EnvironmentVariableTarget]::Machine)
-
-#Write-Host "Adding public key to authorized_keys"
-#$keyPath = "~\.ssh\authorized_keys"
-#New-Item -Type Directory ~\.ssh > $null
-#$sshKey | Out-File $keyPath -Encoding Ascii
-
-Write-Host "Opening firewall port 22"
-New-NetFirewallRule -Protocol TCP -LocalPort 22 -Direction Inbound -Action Allow -DisplayName SSH
-
-Write-Host "Setting sshd service startup type to 'Automatic'"
-Set-Service sshd -StartupType Automatic
-Set-Service ssh-agent -StartupType Automatic
-Write-Host "Setting sshd service restart behavior"
-sc.exe failure sshd reset= 86400 actions= restart/500
-
-#Write-Host "Configuring sshd"
-#(Get-Content C:\ProgramData\ssh\sshd_config).replace('#TCPKeepAlive yes', 'TCPKeepAlive yes').replace('#ClientAliveInterval 0', 'ClientAliveInterval 300').replace('#ClientAliveCountMax 3', 'ClientAliveCountMax 3') | Set-Content C:\ProgramData\ssh\sshd_config
-
-Write-Host "Starting sshd service"
-Start-Service sshd
-Start-Service ssh-agent

wfvm/layers/default.nix

@@ -8,8 +8,8 @@ in
     script = let
       Anaconda3 = pkgs.fetchurl {
         name = "Anaconda3.exe";
-        url = "https://repo.anaconda.com/archive/Anaconda3-2021.05-Windows-x86_64.exe";
+        url = "https://repo.anaconda.com/archive/Anaconda3-2020.02-Windows-x86_64.exe";
-        sha256 = "1lpk7k4gydyk524z1nk4rrninrwi20g2ias2njc9w0a40hwl5nwk";
+        sha256 = "0n31l8l89jrjrbzbifxbjnr3g320ly9i4zfyqbf3l9blf4ygbhl3";
       };
     in
       ''
@@ -71,8 +71,8 @@ in
     script = let
       bootstrapper = pkgs.fetchurl {
         name = "RESTRICTDIST-vs_Community.exe";
-        url = "https://aka.ms/vs/16/release/vs_community.exe";
+        url = "https://download.visualstudio.microsoft.com/download/pr/ac05c4f5-0da1-429f-8701-ce509ac69926/cc9556137c66a373670376d6db2fc5c5c937b2b0bf7b3d3cac11c69e33615511/vs_Community.exe";
-        sha256 = "sha256-l4ZKFZTgHf3BmD0eFWyGwsvb4lqB/LiQYizAABOs3gg=";
+        sha256 = "04amc4rrxihimhy3syxzn2r3gjf5qlpxpmkn0dkp78v6gh9md5fc";
       };
       # This touchy-feely "community" piece of trash seems deliberately crafted to break Wine, so we use the VM to run it.
       download-vs = wfvm.utils.wfvm-run {
@@ -93,7 +93,7 @@ in
 
         outputHashAlgo = "sha256";
         outputHashMode = "recursive";
-        outputHash = "sha256-GoOKzln8DXVMx52jWGEjwkOFkpSW+wEffAVmBVugIyk=";
+        outputHash = "0fp7a6prjp8n8sirwday13wis3xyzhmrwi377y3x89nxzysp0mnv";
 
         phases = [ "buildPhase" ];
         buildInputs = [ download-vs ];
@@ -118,7 +118,7 @@ in
     name = "MSVC-ide-unbreak";
     script =
       ''
-      win-exec 'cd "C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\Common7\IDE" && devenv /ResetSettings'
+      win-exec 'cd "C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\Common7\IDE" && devenv /ResetSettings'
       sleep 40
       '';
   };
@@ -154,16 +154,6 @@ in
       win-exec "reg add HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\Personalization /v NoLockScreen /t REG_DWORD /d 1"
     '';
   };
-  # Don't let Windows start completely rewriting gigabytes of disk
-  # space. Defragmentation increases the size of our qcow layers
-  # needlessly.
-  disable-scheduled-defrag = {
-    name = "disable-scheduled-defrag";
-    script = ''
-      echo Disabling scheduled defragmentation service
-      win-exec 'schtasks /Change /DISABLE /TN "\Microsoft\Windows\Defrag\ScheduledDefrag"'
-    '';
-  };
 
   # Chain together layers that are quick to run so that the VM does
   # not have to be started/shutdown for each.

wfvm/openssh/README.md

@@ -0,0 +1 @@
+This file is not publicaly acessible anywhere so had to be extracted from a connected instance

wfvm/utils.nix

@@ -1,45 +1,23 @@
-{ pkgs
+{ pkgs, baseRtc ? "2020-04-20T14:21:42", cores ? "4", qemuMem ? "4G", efi ? true }:
-, baseRtc ? "2022-10-10T10:10:10"
-, cores ? "4"
-, qemuMem ? "4G"
-, efi ? true
-, enableTpm ? false
-, ...
-}:
 
 rec {
   # qemu_test is a smaller closure only building for a single system arch
-  qemu = pkgs.qemu;
+  qemu = pkgs.qemu_test;
-
-  OVMF = pkgs.OVMF.override {
-    secureBoot = true;
-  };
 
   mkQemuFlags = extraFlags: [
     "-enable-kvm"
     "-cpu host"
     "-smp ${cores}"
     "-m ${qemuMem}"
-    "-M q35,smm=on"
+    "-M q35"
     "-vga qxl"
     "-rtc base=${baseRtc}"
     "-device qemu-xhci"
     "-device virtio-net-pci,netdev=n1"
   ] ++ pkgs.lib.optionals efi [
-    "-bios ${OVMF.fd}/FV/OVMF.fd"
+    "-bios ${pkgs.OVMF.fd}/FV/OVMF.fd"
-  ] ++ pkgs.lib.optionals enableTpm [
-    "-chardev" "socket,id=chrtpm,path=tpm.sock"
-    "-tpmdev" "emulator,id=tpm0,chardev=chrtpm"
-    "-device" "tpm-tis,tpmdev=tpm0"
   ] ++ extraFlags;
 
-  tpmStartCommands = pkgs.lib.optionalString enableTpm ''
-    mkdir -p tpmstate
-    ${pkgs.swtpm}/bin/swtpm socket \
-      --tpmstate dir=tpmstate \
-      --ctrl type=unixio,path=tpm.sock &
-  '';
-
   # Pass empty config file to prevent ssh from failing to create ~/.ssh
   sshOpts = "-F /dev/null -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null -o LogLevel=ERROR -o ConnectTimeout=1";
   win-exec = pkgs.writeShellScriptBin "win-exec" ''
@@ -82,10 +60,8 @@ rec {
     echo win-put $1 -\> $2
     ${pkgs.sshpass}/bin/sshpass -p1234 -- \
       ${pkgs.openssh}/bin/sftp -r -P 2022 ${sshOpts} \
-      wfvm@localhost -b- << EOF
+      wfvm@localhost <<< "cd $2
-        cd $2
+        put $1"
-        put $1
-    EOF
   '';
   win-get = pkgs.writeShellScriptBin "win-get" ''
     set -e
@@ -115,7 +91,6 @@ rec {
       ]);
     in pkgs.writeShellScriptBin "wfvm-run-${name}" ''
       set -e -m
-      ${tpmStartCommands}
       ${qemu}/bin/qemu-system-x86_64 ${pkgs.lib.concatStringsSep " " qemuParams} &
 
       ${win-wait}/bin/win-wait

wfvm/win.nix

@@ -5,17 +5,16 @@
 , impureMode ? false
 , installCommands ? []
 , users ? {}
-, enableTpm ? true
 # autounattend always installs index 1, so this default is backward-compatible
-, imageSelection ? "Windows 11 Pro N"
+, imageSelection ? "1"
 , efi ? true
 , ...
 }@attrs:
 
 let
   lib = pkgs.lib;
-  utils = import ./utils.nix ({ inherit pkgs efi enableTpm; } // attrs);
+  utils = import ./utils.nix { inherit pkgs efi; };
-  inherit (pkgs) guestfs-tools;
+  libguestfs = pkgs.libguestfs-with-appliance;
 
   # p7zip on >20.03 has known vulns but we have no better option
   p7zip = pkgs.p7zip.overrideAttrs(old: {
@@ -25,7 +24,7 @@ let
   });
 
   runQemuCommand = name: command: (
-    pkgs.runCommand name { buildInputs = [ p7zip utils.qemu guestfs-tools ]; }
+    pkgs.runCommandNoCC name { buildInputs = [ p7zip utils.qemu libguestfs ]; }
       (
         ''
           if ! test -f; then
@@ -36,25 +35,23 @@ let
       )
   );
 
-  windowsIso = if windowsImage != null then windowsImage else pkgs.requireFile rec {
+  windowsIso = if windowsImage != null then windowsImage else pkgs.fetchurl {
-    name = "Win11_22H2_English_x64v2.iso";
+    name = "RESTRICTDIST-release_svc_refresh_CLIENT_LTSC_EVAL_x64FRE_en-us.iso";
-    sha256 = "0xhhxy47yaf1jsfmskym5f65hljw8q0aqs70my86m402i6dsjnc0";
+    url = "https://software-download.microsoft.com/download/sg/17763.107.101029-1455.rs5_release_svc_refresh_CLIENT_LTSC_EVAL_x64FRE_en-us.iso";
-    message = "Get disk image ${name} from https://www.microsoft.com/en-us/software-download/windows11/";
+    sha256 = "668fe1af70c2f7416328aee3a0bb066b12dc6bbd2576f40f812b95741e18bc3a";
   };
 
+  # stable as of 2021-04-08
   virtioWinIso = pkgs.fetchurl {
-    url = "https://fedorapeople.org/groups/virt/virtio-win/direct-downloads/archive-virtio/virtio-win-0.1.229-1/virtio-win.iso";
+    url = "https://fedorapeople.org/groups/virt/virtio-win/direct-downloads/archive-virtio/virtio-win-0.1.185-2/virtio-win-0.1.185.iso";
-    sha256 = "1q5vrcd70kya4nhlbpxmj7mwmwra1hm3x7w8rzkawpk06kg0v2n8";
+    sha256 = "11n3kjyawiwacmi3jmfmn311g9xvfn6m0ccdwnjxw1brzb4kqaxg";
   };
 
-  openSshServerPackage = pkgs.fetchurl {
+  openSshServerPackage = ./openssh/server-package.cab;
-    url = "https://github.com/PowerShell/Win32-OpenSSH/releases/download/V8.6.0.0p1-Beta/OpenSSH-Win64.zip";
-    sha256 = "1dw6n054r0939501dpxfm7ghv21ihmypdx034van8cl21gf1b4lz";
-  };
 
   autounattend = import ./autounattend.nix (
     attrs // {
-      inherit pkgs enableTpm;
+      inherit pkgs;
       users = users // {
         wfvm = {
           password = "1234";
@@ -72,16 +69,17 @@ let
   # Packages required to drive installation of other packages
   bootstrapPkgs =
     runQemuCommand "bootstrap-win-pkgs.img" ''
+      mkdir -p pkgs/fod
+
       7z x -y ${virtioWinIso} -opkgs/virtio
 
       cp ${bundleInstaller} pkgs/"$(stripHash "${bundleInstaller}")"
 
       # Install optional windows features
-      cp ${openSshServerPackage} pkgs/OpenSSH-Win64.zip
+      cp ${openSshServerPackage} pkgs/fod/OpenSSH-Server-Package~31bf3856ad364e35~amd64~~.cab
 
       # SSH setup script goes here because windows XML parser sucks
-      cp ${./install-ssh.ps1} pkgs/install-ssh.ps1
+      cp ${autounattend.setupScript} pkgs/ssh-setup.ps1
-      cp ${autounattend.setupScript} pkgs/setup.ps1
 
       virt-make-fs --partition --type=fat pkgs/ $out
     '';
@@ -109,7 +107,7 @@ let
       ''
         #!${pkgs.runtimeShell}
         set -euxo pipefail
-        export PATH=${lib.makeBinPath [ p7zip utils.qemu guestfs-tools pkgs.wimlib ]}:$PATH
+        export PATH=${lib.makeBinPath [ p7zip utils.qemu libguestfs pkgs.wimlib ]}:$PATH
 
         # Create a bootable "USB" image
         # Booting in USB mode circumvents the "press any key to boot from cdrom" prompt
@@ -119,10 +117,20 @@ let
         mkdir -p win/nix-win
         7z x -y ${windowsIso} -owin
 
-        # Split image so it fits in FAT32 partition
+        # Extract desired variant from install.wim
-        wimsplit win/sources/install.wim win/sources/install.swm 4070
+        # This is useful if the install.wim contains multiple Windows
+        # versions (e.g., Home, Pro, ..), because the autounattend file
+        # will always select index 1. With this mechanism, a variant different
+        # from the first one can be automatically selected.
+        # imageSelection can be either an index (1-N) or the image name
+        # wiminfo can list all images contained in a given WIM file
+        wimexport win/sources/install.wim "${imageSelection}" win/sources/install_selected.wim
         rm win/sources/install.wim
 
+        # Split image so it fits in FAT32 partition
+        wimsplit win/sources/install_selected.wim win/sources/install.swm 4096
+        rm win/sources/install_selected.wim
+
         cp ${autounattend.autounattendXML} win/autounattend.xml
 
         ${if efi then ''
@@ -132,20 +140,18 @@ let
         ''}
         rm -rf win
 
-        ${utils.tpmStartCommands}
-
         # Qemu requires files to be rw
         qemu-img create -f qcow2 c.img ${diskImageSize}
         qemu-system-x86_64 ${lib.concatStringsSep " " qemuParams}
       ''
   );
 
-  baseImage = pkgs.runCommand "RESTRICTDIST-windows.img" {} ''
+  baseImage = pkgs.runCommandNoCC "RESTRICTDIST-windows.img" {} ''
     ${installScript}
     mv c.img $out
   '';
 
-  finalImage = builtins.foldl' (acc: v: pkgs.runCommand "RESTRICTDIST-${v.name}.img" {
+  finalImage = builtins.foldl' (acc: v: pkgs.runCommandNoCC "RESTRICTDIST-${v.name}.img" {
     buildInputs = with utils; [
       qemu win-wait win-exec win-put
     ] ++ (v.buildInputs or []);
@@ -160,11 +166,8 @@ let
     ]);
 
   in ''
-    set -x
-    ${utils.tpmStartCommands}
-
     # Create an image referencing the previous image in the chain
-    qemu-img create -F qcow2 -f qcow2 -b ${acc} c.img
+    qemu-img create -f qcow2 -b ${acc} c.img
 
     set -m
     qemu-system-x86_64 ${lib.concatStringsSep " " qemuParams} &