1 files changed, 51 insertions, 0 deletions
diff --git a/nixos/modules/virtualisation/nova-config.nix b/nixos/modules/virtualisation/nova-config.nix
new file mode 100644
index 000000000000..6bcc05d3c1e7
--- /dev/null
+++ b/nixos/modules/virtualisation/nova-config.nix
@@ -0,0 +1,51 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+{
+  imports = [
+    ../profiles/qemu-guest.nix
+    ../profiles/headless.nix
+  ];
+
+  config = {
+    fileSystems."/".device = "/dev/disk/by-label/nixos";
+
+    boot.kernelParams = [ "console=ttyS0" ];
+    boot.loader.grub.device = "/dev/vda";
+    boot.loader.timeout = 0;
+
+    # Allow root logins
+    services.openssh.enable = true;
+    services.openssh.permitRootLogin = "prohibit-password";
+
+    # Put /tmp and /var on /ephemeral0, which has a lot more space.
+    # Unfortunately we can't do this with the `fileSystems' option
+    # because it has no support for creating the source of a bind
+    # mount.  Also, "move" /nix to /ephemeral0 by layering a unionfs-fuse
+    # mount on top of it so we have a lot more space for Nix operations.
+
+    /*
+    boot.initrd.postMountCommands =
+      ''
+        mkdir -m 1777 -p $targetRoot/ephemeral0/tmp
+        mkdir -m 1777 -p $targetRoot/tmp
+        mount --bind $targetRoot/ephemeral0/tmp $targetRoot/tmp
+
+        mkdir -m 755 -p $targetRoot/ephemeral0/var
+        mkdir -m 755 -p $targetRoot/var
+        mount --bind $targetRoot/ephemeral0/var $targetRoot/var
+
+        mkdir -p /unionfs-chroot/ro-nix
+        mount --rbind $targetRoot/nix /unionfs-chroot/ro-nix
+
+        mkdir -p /unionfs-chroot/rw-nix
+        mkdir -m 755 -p $targetRoot/ephemeral0/nix
+        mount --rbind $targetRoot/ephemeral0/nix /unionfs-chroot/rw-nix
+        unionfs -o allow_other,cow,nonempty,chroot=/unionfs-chroot,max_files=32768 /rw-nix=RW:/ro-nix=RO $targetRoot/nix
+      '';
+
+      boot.initrd.supportedFilesystems = [ "unionfs-fuse" ];
+    */
+  };
+}