diff --git a/modules/image/disk/builder.nix b/modules/image/disk/builder.nix
index 39f321c..280b30e 100644
--- a/modules/image/disk/builder.nix
+++ b/modules/image/disk/builder.nix
@@ -44,12 +44,10 @@ let
           image.repart = {
             name = "verity";
             split = true;
-            mkfsOptions = lib.mkIf config.image.compress {
-              erofs = [
-                "-zlz4hc,level=12"
-                "-Efragments,dedupe,ztailpacking"
-              ];
-            };
+            mkfsOptions.erofs = [
+              "-zlz4hc,level=12"
+              "-Efragments,dedupe,ztailpacking"
+            ];
             partitions = initialPartitions;
           };
         }
@@ -132,10 +130,6 @@ let
 in
 {
 
-  options.image.compress = lib.mkEnableOption "image compression" // {
-    default = true;
-  };
-
   config.system.build = {
     inherit verityRootHash;
 
diff --git a/tests/common.nix b/tests/common.nix
index 23232be..934b020 100644
--- a/tests/common.nix
+++ b/tests/common.nix
@@ -1,154 +1,111 @@
-{
-  self,
-  lib,
-  pkgs,
-  ...
-}:
+{ self, lib, pkgs, ... }:
 
-with import (pkgs.path + "/nixos/lib/testing-python.nix") {
-  inherit pkgs;
-  inherit (pkgs.hostPlatform) system;
-};
+with import (pkgs.path + "/nixos/lib/testing-python.nix") { inherit pkgs; inherit (pkgs.hostPlatform) system; };
 
 let
+
+  nixos-lib = import (pkgs.path + "/nixos/lib") {};
   qemu-common = import (pkgs.path + "/nixos/lib/qemu-common.nix") { inherit lib pkgs; };
 
-in
-rec {
+in rec {
 
-  makeSystem =
-    extraConfig:
-    (import (pkgs.path + "/nixos/lib/eval-config.nix")) {
-      inherit pkgs lib;
-      system = null;
-      modules = [
-        {
-          nixpkgs.hostPlatform = pkgs.hostPlatform;
-        }
-        {
-          users.allowNoPasswordLogin = true;
-          system.stateVersion = lib.versions.majorMinor lib.version;
-          system.image.id = lib.mkDefault "test";
-          system.image.version = lib.mkDefault "1";
-          networking.hosts."10.0.2.1" = [ "server.test" ];
-        }
-        {
-          boot.kernelParams = [
-            "console=ttyS0,115200n8"
-            "systemd.journald.forward_to_console=1"
-          ];
-          image.compress = false;
-          boot.initrd.compressor = lib.mkForce "zstd";
-          boot.initrd.compressorArgs = lib.mkForce [ "-8" ];
-        }
-        (pkgs.path + "/nixos/modules/testing/test-instrumentation.nix")
-        self.nixosModules.server
-        self.nixosModules.image
-        extraConfig
-      ];
-    };
+  makeSystem = extraConfig:
+  (import (pkgs.path + "/nixos/lib/eval-config.nix")) {
+    inherit pkgs lib;
+    system = null;
+    modules = [
+      {
+        nixpkgs.hostPlatform = pkgs.hostPlatform;
+      }
+      {
+        users.allowNoPasswordLogin = true;
+        system.stateVersion = lib.versions.majorMinor lib.version;
+        system.image.id = lib.mkDefault "test";
+        system.image.version = lib.mkDefault "1";
+        networking.hosts."10.0.2.1" = [ "server.test" ];
+      }
+      {
+        boot.kernelParams = [ "console=ttyS0,115200n8" "systemd.journald.forward_to_console=1" ];
+        image.compress = false;
+        boot.initrd.compressor = lib.mkForce "zstd";
+        boot.initrd.compressorArgs = lib.mkForce [ "-8" ];
+      }
+      (pkgs.path + "/nixos/modules/testing/test-instrumentation.nix")
+      self.nixosModules.server
+      self.nixosModules.image
+      extraConfig
+    ];
+  };
 
-  makeImage =
-    extraConfig:
-    let
-      system = makeSystem extraConfig;
-    in
-    "${system.config.system.build.image}/${system.config.system.build.image.imageFile}";
+  makeImage = extraConfig: let
+    system = makeSystem extraConfig;
+  in "${system.config.system.build.image}/${system.config.system.build.image.imageFile}";
 
-  makeUpdatePackage =
-    extraConfig:
-    let
-      system = makeSystem extraConfig;
-    in
-    "${system.config.system.build.updatePackage}";
+  makeUpdatePackage = extraConfig: let
+    system = makeSystem extraConfig;
+  in "${system.config.system.build.updatePackage}";
 
-  makeImageTest =
-    {
-      name,
-      image,
-      script,
-      httpRoot ? null,
-    }:
-    let
-      qemu = qemu-common.qemuBinary pkgs.qemu_test;
-      flags = [
-        "-m"
-        "512M"
-        "-drive"
-        "if=pflash,format=raw,unit=0,readonly=on,file=${pkgs.OVMF.firmware}"
-        "-drive"
-        "if=pflash,format=raw,unit=1,readonly=on,file=${pkgs.OVMF.variables}"
-        "-drive"
-        "if=virtio,file=${mutableImage}"
-        "-chardev"
-        "socket,id=chrtpm,path=${tpmFolder}/swtpm-sock"
-        "-tpmdev"
-        "emulator,id=tpm0,chardev=chrtpm"
-        "-device"
-        "tpm-tis,tpmdev=tpm0"
-        "-netdev"
-        (
-          "'user,id=net0"
-          + (lib.optionalString (
-            httpRoot != null
-          ) ",guestfwd=tcp:10.0.2.1:80-cmd:${pkgs.micro-httpd}/bin/micro_httpd ${httpRoot}")
-          + "'"
+  makeImageTest = { name, image, script, httpRoot ? null }: let
+    qemu = qemu-common.qemuBinary pkgs.qemu_test;
+    flags = [
+      "-m" "512M"
+      "-drive" "if=pflash,format=raw,unit=0,readonly=on,file=${pkgs.OVMF.firmware}"
+      "-drive" "if=pflash,format=raw,unit=1,readonly=on,file=${pkgs.OVMF.variables}"
+      "-drive" "if=virtio,file=${mutableImage}"
+      "-chardev" "socket,id=chrtpm,path=${tpmFolder}/swtpm-sock"
+      "-tpmdev" "emulator,id=tpm0,chardev=chrtpm"
+      "-device" "tpm-tis,tpmdev=tpm0"
+      "-netdev" ("'user,id=net0" + (lib.optionalString (httpRoot != null) ",guestfwd=tcp:10.0.2.1:80-cmd:${pkgs.micro-httpd}/bin/micro_httpd ${httpRoot}") + "'")
+      "-device" "virtio-net-pci,netdev=net0"
+    ];
+    flagsStr = lib.concatStringsSep " " flags;
+    startCommand = "${qemu} ${flagsStr}";
+    mutableImage = "/tmp/linked-image.qcow2";
+    tpmFolder = "/tmp/emulated_tpm";
+    indentLines = str: lib.concatLines (map (s: "  " + s) (lib.splitString "\n" str));
+  in makeTest {
+    inherit name;
+    nodes = { };
+    testScript = ''
+      import os
+      import subprocess
+
+      subprocess.check_call(
+          [
+              "qemu-img",
+              "create",
+              "-f",
+              "qcow2",
+              "-F",
+              "raw",
+              "-b",
+              "${image}",
+              "${mutableImage}",
+          ]
+      )
+      subprocess.check_call(["qemu-img", "resize", "${mutableImage}", "4G"])
+
+      os.mkdir("${tpmFolder}")
+      os.mkdir("${tpmFolder}/swtpm")
+
+      def start_tpm():
+        subprocess.Popen(
+            [
+                "${pkgs.swtpm}/bin/swtpm",
+                "socket",
+                "--tpmstate", "dir=${tpmFolder}/swtpm",
+                "--ctrl", "type=unixio,path=${tpmFolder}/swtpm-sock",
+                "--tpm2"
+            ]
         )
-        "-device"
-        "virtio-net-pci,netdev=net0"
-      ];
-      flagsStr = lib.concatStringsSep " " flags;
-      startCommand = "${qemu} ${flagsStr}";
-      mutableImage = "/tmp/linked-image.qcow2";
-      tpmFolder = "/tmp/emulated_tpm";
-      indentLines = str: lib.concatLines (map (s: "  " + s) (lib.splitString "\n" str));
-    in
-    makeTest {
-      inherit name;
-      nodes = { };
-      testScript =
-        ''
-          import os
-          import subprocess
 
-          subprocess.check_call(
-              [
-                  "qemu-img",
-                  "create",
-                  "-f",
-                  "qcow2",
-                  "-F",
-                  "raw",
-                  "-b",
-                  "${image}",
-                  "${mutableImage}",
-              ]
-          )
-          subprocess.check_call(["qemu-img", "resize", "${mutableImage}", "4G"])
+      machine = create_machine("${startCommand}")
 
-          os.mkdir("${tpmFolder}")
-          os.mkdir("${tpmFolder}/swtpm")
-
-          def start_tpm():
-            subprocess.Popen(
-                [
-                    "${pkgs.swtpm}/bin/swtpm",
-                    "socket",
-                    "--tpmstate", "dir=${tpmFolder}/swtpm",
-                    "--ctrl", "type=unixio,path=${tpmFolder}/swtpm-sock",
-                    "--tpm2"
-                ]
-            )
-
-          machine = create_machine("${startCommand}")
-
-          try:
-        ''
-        + indentLines script
-        + ''
-          finally:
-            machine.shutdown()
-        '';
-    };
+      try:
+    '' + indentLines script + ''
+      finally:
+        machine.shutdown()
+    '';
+  };
 
 }