add debug output via tesseract

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.

flake.lock

@@ -2,16 +2,16 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1685004253,
-        "narHash": "sha256-AbVL1nN/TDicUQ5wXZ8xdLERxz/eJr7+o8lqkIOVuaE=",
-        "owner": "NixOS",
+        "lastModified": 1665449268,
+        "narHash": "sha256-cw4xrQIAZUyJGj58Dp5VLICI0rscd+uap83afiFzlcA=",
+        "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "3e01645c40b92d29f3ae76344a6d654986a91a91",
+        "rev": "285e77efe87df64105ec14b204de6636fb0a7a27",
         "type": "github"
       },
       "original": {
-        "owner": "NixOS",
-        "ref": "nixos-23.05",
+        "owner": "nixos",
+        "ref": "nixos-unstable",
         "repo": "nixpkgs",
         "type": "github"
       }

flake.nix

@@ -2,7 +2,7 @@
   description = "WFVM: Windows Functional Virtual Machine";
 
   inputs = {
-    nixpkgs.url = "github:NixOS/nixpkgs/nixos-23.05";
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
   };
 
   outputs = { self, nixpkgs }:
@@ -12,26 +12,13 @@
 
       pkgs = nixpkgs.legacyPackages.${system};
 
-    in rec {
+    in {
       lib = import ./wfvm {
         inherit pkgs;
       };
 
-      packages.${system} = rec {
-        demoImage = import ./wfvm/demo-image.nix {
-          inherit self;
-        };
-
-        default = lib.utils.wfvm-run {
-          name = "demo";
-          image = demoImage;
-          script =
-            ''
-            echo "Windows booted. Press Enter to terminate VM."
-            read
-            '';
-          display = true;
-        };
+      packages.${system}.demoImage = import ./wfvm/demo-image.nix {
+        inherit self;
       };
     };
 }

wfvm/autounattend.nix

@@ -15,8 +15,7 @@
 , impureShellCommands ? []
 , driveLetter ? "D:"
 , efi ? true
-, imageSelection ? "Windows 11 Pro N"
-, enableTpm
+, imageSelection ? "Windows 10 Pro"
 , ...
 }:
 
@@ -59,16 +58,18 @@ let
   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.";
-    } ]
+    [
+      {
+        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.";
+      }
+    ]
     ++ setupCommands
     ++ [
       {
@@ -147,14 +148,6 @@ 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">
@@ -206,7 +199,6 @@ let
                 <PartitionID>3</PartitionID>
               </InstallTo>
               <InstallFrom>
-                <Path>\install.swm</Path>
                 <MetaData wcm:action="add">
                   <Key>/IMAGE/NAME</Key>
                   <Value>${imageSelection}</Value>
@@ -217,7 +209,7 @@ 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>
@@ -307,7 +299,7 @@ let
         </component>
       </settings>
 
-       <cpi:offlineImage cpi:source="wim:c:/wim/windows-11/install.wim#${imageSelection}" xmlns:cpi="urn:schemas-microsoft-com:cpi" />
+       <cpi:offlineImage cpi:source="wim:c:/wim/windows-10/install.wim#${imageSelection}" xmlns:cpi="urn:schemas-microsoft-com:cpi" />
     </unattend>
   '';
 

wfvm/default.nix

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

wfvm/demo-image.nix

@@ -19,9 +19,9 @@ wfvm.makeWindowsImage {
 
   # Custom base iso
   # windowsImage = pkgs.requireFile rec {
-  #   name = "Win11_22H2_English_x64v1.iso";
-  #   sha256 = "08mbppsm1naf73z8fjyqkf975nbls7xj9n4fq0yp802dv1rz3whd";
-  #   message = "Get disk image ${name} from https://www.microsoft.com/en-us/software-download/windows11/";
+  #   name = "Win10_21H1_English_x64.iso";
+  #   sha256 = "1sl51lnx4r6ckh5fii7m2hi15zh8fh7cf7rjgjq9kacg8hwyh4b9";
+  #   message = "Get ${name} from https://www.microsoft.com/en-us/software-download/windows10ISO";
   # };
 
   # impureShellCommands = [
@@ -57,7 +57,7 @@ wfvm.makeWindowsImage {
         disable-autolock
         disable-firewall
       ])
-      anaconda3 msys2
+      anaconda3 msys2 msvc msvc-ide-unbreak
     ];
 
   # services = {
@@ -70,7 +70,7 @@ wfvm.makeWindowsImage {
 
   # License key (required)
   # productKey = throw "Search the f* web"
-  imageSelection = "Windows 11 Pro N";
+  imageSelection = "Windows 10 Pro";
 
 
   # Locales

wfvm/layers/default.nix

@@ -72,7 +72,7 @@ in
       bootstrapper = pkgs.fetchurl {
         name = "RESTRICTDIST-vs_Community.exe";
         url = "https://aka.ms/vs/16/release/vs_community.exe";
-        sha256 = "sha256-l4ZKFZTgHf3BmD0eFWyGwsvb4lqB/LiQYizAABOs3gg=";
+        sha256 = "sha256-4X8NhdcNyfHkN6eKkNz8Unvv49wRZE4CQ1vf6P1R2ic=";
       };
       # 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 = "0ic3jvslp2y9v8yv9mfr2mafkvj2q5frmcyhmlbxj71si1x3kpag";
 
         phases = [ "buildPhase" ];
         buildInputs = [ download-vs ];

wfvm/utils.nix

@@ -1,45 +1,23 @@
-{ pkgs
-, baseRtc ? "2022-10-10T10:10:10"
-, cores ? "4"
-, qemuMem ? "4G"
-, efi ? true
-, enableTpm ? false
-, ...
-}:
+{ pkgs, baseRtc ? "2022-10-10T10:10:10", cores ? "4", qemuMem ? "4G", efi ? true }:
 
 rec {
   # qemu_test is a smaller closure only building for a single system arch
   qemu = pkgs.qemu;
 
-  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"
-  ] ++ pkgs.lib.optionals enableTpm [
-    "-chardev" "socket,id=chrtpm,path=tpm.sock"
-    "-tpmdev" "emulator,id=tpm0,chardev=chrtpm"
-    "-device" "tpm-tis,tpmdev=tpm0"
+    "-bios ${pkgs.OVMF.fd}/FV/OVMF.fd"
   ] ++ extraFlags;
 
-  tpmStartCommands = pkgs.lib.optionalString enableTpm ''
-    mkdir -p tpmstate
-    ${pkgs.swtpm}/bin/swtpm socket \
-      --tpmstate dir=tpmstate \
-      --ctrl type=unixio,path=tpm.sock &
-  '';
-
   # Pass empty config file to prevent ssh from failing to create ~/.ssh
   sshOpts = "-F /dev/null -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null -o LogLevel=ERROR -o ConnectTimeout=1";
   win-exec = pkgs.writeShellScriptBin "win-exec" ''
@@ -58,6 +36,7 @@ rec {
     # Wait for VM to be accessible
     sleep 20
     echo "Waiting for SSH..."
+    TEXT=""
     while true; do
       if test "$timeout" -eq 0; then
         echo "SSH connection timed out"
@@ -69,6 +48,13 @@ rec {
         break
       fi
 
+      ${pkgs.vncdo}/bin/vncdo rcapture cap.png 0 0 1024 768
+      ${pkgs.imagemagick}/bin/mogrify -density 70x70 -units PixelsPerInch cap.png
+      NEW_TEXT="$(${pkgs.tesseract}/bin/tesseract cap.png stdout)"
+      if [ "$TEXT" != "$NEW_TEXT" ]; then
+        echo "$NEW_TEXT"
+        TEXT="$NEW_TEXT"
+      fi
       echo "Retrying in 1 second, timing out in $timeout seconds"
 
       ((timeout=$timeout-1))
@@ -107,7 +93,7 @@ rec {
         (map ({ listenAddr, targetAddr, port }:
           ",guestfwd=tcp:${listenAddr}:${toString port}-cmd:${pkgs.socat}/bin/socat\\ -\\ tcp:${targetAddr}:${toString port}"
         ) forwardedPorts);
-      qemuParams = mkQemuFlags (pkgs.lib.optional (!display) "-display none" ++ pkgs.lib.optional (!fakeRtc) "-rtc base=localtime" ++ [
+      qemuParams = mkQemuFlags (pkgs.lib.optional (!display) "-vnc 127.0.0.1:0" ++ pkgs.lib.optional (!fakeRtc) "-rtc base=localtime" ++ [
         "-drive"
         "file=${image},index=0,media=disk,cache=unsafe"
         "-snapshot"
@@ -115,7 +101,6 @@ rec {
       ]);
     in pkgs.writeShellScriptBin "wfvm-run-${name}" ''
       set -e -m
-      ${tpmStartCommands}
       ${qemu}/bin/qemu-system-x86_64 ${pkgs.lib.concatStringsSep " " qemuParams} &
 
       ${win-wait}/bin/win-wait

wfvm/win.nix

@@ -5,16 +5,15 @@
 , impureMode ? false
 , installCommands ? []
 , users ? {}
-, enableTpm ? true
 # autounattend always installs index 1, so this default is backward-compatible
-, imageSelection ? "Windows 11 Pro N"
+, imageSelection ? "Windows 10 Pro"
 , 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;
 
   # p7zip on >20.03 has known vulns but we have no better option
@@ -37,14 +36,15 @@ let
   );
 
   windowsIso = if windowsImage != null then windowsImage else pkgs.requireFile rec {
-    name = "Win11_22H2_English_x64v2.iso";
-    sha256 = "0xhhxy47yaf1jsfmskym5f65hljw8q0aqs70my86m402i6dsjnc0";
-    message = "Get disk image ${name} from https://www.microsoft.com/en-us/software-download/windows11/";
+    name = "Win10_21H2_English_x64.iso";
+    sha256 = "0kr3m0bjy086whcbssagsshdxj6lffcz7wmvbh50zhrkxgq3hrbz";
+    message = "Get ${name} from https://www.microsoft.com/en-us/software-download/windows10ISO";
   };
 
+  # 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";
-    sha256 = "1q5vrcd70kya4nhlbpxmj7mwmwra1hm3x7w8rzkawpk06kg0v2n8";
+    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 = "11n3kjyawiwacmi3jmfmn311g9xvfn6m0ccdwnjxw1brzb4kqaxg";
   };
 
   openSshServerPackage = pkgs.fetchurl {
@@ -54,7 +54,7 @@ let
 
   autounattend = import ./autounattend.nix (
     attrs // {
-      inherit pkgs enableTpm;
+      inherit pkgs;
       users = users // {
         wfvm = {
           password = "1234";
@@ -88,7 +88,7 @@ let
 
   installScript = pkgs.writeScript "windows-install-script" (
     let
-      qemuParams = utils.mkQemuFlags (lib.optional (!impureMode) "-display none" ++ [
+      qemuParams = utils.mkQemuFlags (lib.optional (!impureMode) "-vnc 127.0.0.1:0" ++ [
         # "CD" drive with bootstrap pkgs
         "-drive"
         "id=virtio-win,file=${bootstrapPkgs},if=none,format=raw,readonly=on"
@@ -108,7 +108,7 @@ let
     in
       ''
         #!${pkgs.runtimeShell}
-        set -euxo pipefail
+        set -euo pipefail
         export PATH=${lib.makeBinPath [ p7zip utils.qemu guestfs-tools pkgs.wimlib ]}:$PATH
 
         # Create a bootable "USB" image
@@ -132,11 +132,21 @@ 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}
+        qemu-system-x86_64 ${lib.concatStringsSep " " qemuParams} &
+
+        TEXT=""
+        while [ -n "$(jobs)" ]; do
+          ${pkgs.vncdo}/bin/vncdo rcapture cap.png 0 0 1024 768
+          ${pkgs.imagemagick}/bin/mogrify -density 70x70 -units PixelsPerInch cap.png
+          NEW_TEXT="$(${pkgs.tesseract5}/bin/tesseract cap.png stdout)"
+          if [ "$TEXT" != "$NEW_TEXT" ]; then
+            echo "$NEW_TEXT"
+            TEXT="$NEW_TEXT"
+          fi
+          sleep 1
+        done
       ''
   );
 
@@ -161,8 +171,6 @@ 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