home-manager: updates

- OVMF setup in home-manager activation script
 - add pkgs: virt-manager libvirt
 - move username out of linux.nix and darwin.nix into {hm,}flake.nix

.config/home-manager/common.nix

@@ -1,16 +1,4 @@
-{ config, lib, pkgs, ... }:
-
-let
-  OVMFPkg = (pkgs.OVMF.override{
-    secureBoot = true;
-    tpmSupport = true;
-    }).fd;
-  OVMFBinName = if pkgs.stdenv.isAarch64 then "AAVMF"
-    else (
-      if pkgs.stdenv.isx86_64 then "OVMF"
-      else ""
-    );
-in
+{ config, lib, pkgs, OVMFPkg, OVMFBinName, ... }:
 
 {
   programs.home-manager.enable = true;
@@ -105,6 +93,30 @@ in
     };
   };
 
+  # for raw QEMU VMs
+  home.activation = {
+    OVMFActivation = lib.hm.dag.entryAfter [ "installPackages" ] (if pkgs.stdenv.isx86_64 then ''
+        EDKII_CODE_NIX="${OVMFPkg}/FV/${OVMFBinName}_CODE.fd"
+        EDKII_VARS_NIX="${OVMFPkg}/FV/${OVMFBinName}_VARS.fd"
+
+        EDKII_DIR_HOME="$HOME/.local/share/edk2"
+        EDKII_CODE_HOME="$EDKII_DIR_HOME/EDKII_CODE"
+        EDKII_VARS_HOME="$EDKII_DIR_HOME/EDKII_VARS"
+
+        if [ -d "$EDKII_DIR_HOME" ]; then
+            rm -rf "$EDKII_DIR_HOME"
+        fi
+        mkdir -vp "$EDKII_DIR_HOME"
+
+        cp "$EDKII_CODE_NIX" "$EDKII_CODE_HOME"
+        cp "$EDKII_VARS_NIX" "$EDKII_VARS_HOME"
+
+        chown pratham:pratham "$EDKII_CODE_HOME" "$EDKII_VARS_HOME"
+        chmod 644 "$EDKII_CODE_HOME" "$EDKII_VARS_HOME"
+      '' else "");
+  };
+
+  # for libvirt, virt-manager, virsh
   xdg.configFile = {
     "libvirt/qemu.conf" = {
       enable = true;

.config/home-manager/darwin.nix

@@ -1,11 +1,8 @@
-{ config, lib, pkgs, ... }:
-let
-  me = "pratham";
-in
+{ config, lib, pkgs, whoAmI, ... }:
 
 {
-  home.username = "${me}";
-  home.homeDirectory = "/Users/${me}";
+  home.username = "${whoAmI}";
+  home.homeDirectory = "/Users/${whoAmI}";
 
   targets.darwin = {
     currentHostDefaults = {

.config/home-manager/hm.flake.nix

@@ -14,14 +14,24 @@
           inherit system;
           config.allowUnfree = true;
         };
+        OVMFPkg = (pkgs.OVMF.override{
+          secureBoot = true;
+          tpmSupport = true;
+          }).fd;
+        OVMFBinName = if pkgs.stdenv.isAarch64 then "AAVMF"
+          else (
+            if pkgs.stdenv.isx86_64 then "OVMF"
+            else ""
+          );
+        whoAmI = "pratham";
       in
       {
         packages.homeConfigurations = {
-          "pratham" = home-manager.lib.homeManagerConfiguration {
+          "${whoAmI}" = home-manager.lib.homeManagerConfiguration {
             inherit pkgs;
             modules = [
-              ./home.nix
-              (if pkgs.stdenv.isLinux then ./linux.nix else ./darwin.nix)
+              ./home.nix OVMFPkg OVMFBinName
+              (if pkgs.stdenv.isLinux then ./linux.nix whoAmI else ./darwin.nix whoAmI)
               {
                 home.stateVersion = "23.11";
               }

.config/home-manager/linux.nix

@@ -1,13 +1,15 @@
-{ config, lib, pkgs, ... }:
-let
-  me = "pratham";
-in
+{ config, lib, pkgs, whoAmI, ... }:
 
 {
-  home.username = "${me}";
-  home.homeDirectory = "/home/${me}";
+  home.username = "${whoAmI}";
+  home.homeDirectory = "/home/${whoAmI}";
   targets.genericLinux.enable = true;
 
+  environment.systemPackages = with pkgs; [
+    virt-manager
+    libvirt
+  ];
+
   systemd.user = {
     timers = {
       "update-flake-inputs" = {