nixos/tests/incus: add lxd-to-incus migration test

nixos/modules/virtualisation/incus.nix

@@ -150,10 +150,12 @@ in
       after = [
         "network-online.target"
         "lxcfs.service"
-      ] ++ (lib.optional cfg.socketActivation "incus.socket");
+        "incus.socket"
+      ];
       requires = [
         "lxcfs.service"
-      ] ++ (lib.optional cfg.socketActivation "incus.socket");
+        "incus.socket"
+      ];
       wants = [
         "network-online.target"
       ];
@@ -183,7 +185,7 @@ in
       };
     };
 
-    systemd.sockets.incus = lib.mkIf cfg.socketActivation {
+    systemd.sockets.incus = {
       description = "Incus UNIX socket";
       wantedBy = [ "sockets.target" ];
 
@@ -191,7 +193,6 @@ in
         ListenStream = "/var/lib/incus/unix.socket";
         SocketMode = "0660";
         SocketGroup = "incus-admin";
-        Service = "incus.service";
       };
     };
 

nixos/modules/virtualisation/lxd.nix

@@ -224,16 +224,14 @@ in {
         LimitNPROC = "infinity";
         TasksMax = "infinity";
 
-        Restart = "on-failure";
-        TimeoutStartSec = "${cfg.startTimeout}s";
-        TimeoutStopSec = "30s";
-
         # By default, `lxd` loads configuration files from hard-coded
         # `/usr/share/lxc/config` - since this is a no-go for us, we have to
         # explicitly tell it where the actual configuration files are
         Environment = lib.mkIf (config.virtualisation.lxc.lxcfs.enable)
           "LXD_LXC_TEMPLATE_CONFIG=${pkgs.lxcfs}/share/lxc/config";
       };
+
+      unitConfig.ConditionPathExists = "!/var/lib/incus/.migrated-from-lxd";
     };
 
     systemd.services.lxd-preseed = lib.mkIf (cfg.preseed != null) {

nixos/tests/incus/default.nix

@@ -6,9 +6,8 @@
 }:
 {
   container = import ./container.nix { inherit system pkgs; };
+  lxd-to-incus = import ./lxd-to-incus.nix { inherit system pkgs; };
   preseed = import ./preseed.nix { inherit system pkgs; };
   socket-activated = import ./socket-activated.nix { inherit system pkgs; };
-  virtual-machine = handleTestOn [ "x86_64-linux" ] ./virtual-machine.nix {
-    inherit system pkgs;
-  };
+  virtual-machine = handleTestOn [ "x86_64-linux" ] ./virtual-machine.nix { inherit system pkgs; };
 }

nixos/tests/incus/lxd-to-incus.nix

@@ -0,0 +1,112 @@
+import ../make-test-python.nix (
+
+  { pkgs, lib, ... }:
+
+  let
+    releases = import ../../release.nix { configuration.documentation.enable = lib.mkForce false; };
+
+    container-image-metadata = releases.lxdContainerMeta.${pkgs.stdenv.hostPlatform.system};
+    container-image-rootfs = releases.lxdContainerImage.${pkgs.stdenv.hostPlatform.system};
+  in
+  {
+    name = "lxd-to-incus";
+
+    meta = {
+      maintainers = lib.teams.lxc.members;
+    };
+
+    nodes.machine =
+      { lib, ... }:
+      {
+        environment.systemPackages = [ pkgs.lxd-to-incus ];
+
+        virtualisation = {
+          diskSize = 6144;
+          cores = 2;
+          memorySize = 2048;
+
+          lxd.enable = true;
+          lxd.preseed = {
+            networks = [
+              {
+                name = "nixostestbr0";
+                type = "bridge";
+                config = {
+                  "ipv4.address" = "10.0.100.1/24";
+                  "ipv4.nat" = "true";
+                };
+              }
+            ];
+            profiles = [
+              {
+                name = "default";
+                devices = {
+                  eth0 = {
+                    name = "eth0";
+                    network = "nixostestbr0";
+                    type = "nic";
+                  };
+                  root = {
+                    path = "/";
+                    pool = "nixostest_pool";
+                    size = "35GiB";
+                    type = "disk";
+                  };
+                };
+              }
+              {
+                name = "nixos_notdefault";
+                devices = { };
+              }
+            ];
+            storage_pools = [
+              {
+                name = "nixostest_pool";
+                driver = "dir";
+              }
+            ];
+          };
+
+          incus.enable = true;
+        };
+      };
+
+    testScript = ''
+      def lxd_wait_for_preseed(_) -> bool:
+        _, output = machine.systemctl("is-active lxd-preseed.service")
+        return ("inactive" in output)
+
+      def lxd_instance_is_up(_) -> bool:
+          status, _ = machine.execute("lxc exec container --disable-stdin --force-interactive /run/current-system/sw/bin/true")
+          return status == 0
+
+      def incus_instance_is_up(_) -> bool:
+          status, _ = machine.execute("incus exec container --disable-stdin --force-interactive /run/current-system/sw/bin/true")
+          return status == 0
+
+      with machine.nested("initialize lxd and resources"):
+        machine.wait_for_unit("sockets.target")
+        machine.wait_for_unit("lxd.service")
+        retry(lxd_wait_for_preseed)
+
+        machine.succeed("lxc image import ${container-image-metadata}/*/*.tar.xz ${container-image-rootfs}/*/*.tar.xz --alias nixos")
+        machine.succeed("lxc launch nixos container")
+        retry(lxd_instance_is_up)
+
+      machine.wait_for_unit("incus.service")
+
+      with machine.nested("run migration"):
+          machine.succeed("lxd-to-incus --yes")
+
+      with machine.nested("verify resources migrated to incus"):
+          machine.succeed("incus config show container")
+          retry(incus_instance_is_up)
+          machine.succeed("incus exec container -- true")
+          machine.succeed("incus profile show default | grep nixostestbr0")
+          machine.succeed("incus profile show default | grep nixostest_pool")
+          machine.succeed("incus profile show nixos_notdefault")
+          machine.succeed("incus storage show nixostest_pool")
+          machine.succeed("incus network show nixostestbr0")
+    '';
+  }
+)

pkgs/by-name/lx/lxd-to-incus/package.nix

@@ -1,6 +1,7 @@
 { lib
 , buildGoModule
 , fetchFromGitHub
+, fetchpatch
 , nix-update-script
 }:
 
@@ -15,6 +16,14 @@ buildGoModule rec {
     hash = "sha256-crWepf5j3Gd1lhya2DGIh/to7l+AnjKJPR+qUd9WOzw=";
   };
 
+  patches = [
+    # create migration touch file, remove > 0.4.0
+    (fetchpatch {
+      url = "https://github.com/lxc/incus/commit/edc5fd2a9baccfb7b6814a440e2947cbb580afcf.diff";
+      hash = "sha256-ffQfMFrKDPuLU4jVbG/VGHSO3DmeHw30ATJ8yxJAoHQ=";
+    })
+  ];
+
   modRoot = "cmd/lxd-to-incus";
 
   vendorHash = "sha256-cBAqJz3Y4CqyxTt7u/4mXoQPKmKgQ3gYJV1NiC/H+TA=";

pkgs/tools/admin/lxd/default.nix

@@ -76,6 +76,7 @@ buildGoModule rec {
   '';
 
   passthru.tests.lxd = nixosTests.lxd;
+  passthru.tests.lxd-to-incus = nixosTests.incus.lxd-to-incus;
   passthru.ui = callPackage ./ui.nix { };
   passthru.updateScript = gitUpdater {
     url = "https://github.com/canonical/lxd.git";