integrate libvirtd group support + document in install guide + remove NixOS patch

bin/winapps

@@ -301,9 +301,10 @@ function waGetFreeRDPCommand() {
 function waCheckGroupMembership() {
     # Identify groups the current user belongs to.
     # shellcheck disable=SC2155 # Silence warnings regarding masking return values through simultaneous declaration and assignment.
-    local USER_GROUPS=$(groups "$(whoami)")
+    local USER_GROUPS=$(id -nG "$(whoami)")
 
-    if ! (echo "$USER_GROUPS" | grep -q -E "\blibvirt\b") || ! (echo "$USER_GROUPS" | grep -q -E "\bkvm\b"); then
+    if ! echo "$USER_GROUPS" | grep -qE '\b(libvirt|libvirtd)\b' || \
+       ! echo "$USER_GROUPS" | grep -qE '\bkvm\b'; then
         waThrowExit "$EC_NOT_IN_GROUP"
     fi
 }

docs/libvirt.md

@@ -46,6 +46,8 @@ Together, these components form a powerful and flexible virtualization stack, wi
     sudo reboot # Reboot the system to ensure the user is added to the relevant groups.
     ```
 
+    Note: On NixOS, the group name for libvirt is `libvirtd` and not `libvirt`. In addition, user and group management on NixOS is handled through the Nix configuration files and not via traditional tools like `usermod`. Please see "Adding User to a group" on [this NixOS Wiki page](https://wiki.nixos.org/wiki/User_management).
+
     Note: Due to a known bug in `rpm-ostree`, which affects various distributions such as Silverblue, Bazzite, Bluefin, Kinoite, Aurora, UCore, and others, the commands provided earlier may not properly add your user to all required groups. If the `groups $USER` command does not show your user as being part of the necessary groups, you'll need to manually add these groups to `/etc/group` if they are present in `/usr/lib/group`.
 
     To resolve this:

packages/winapps/default.nix

@@ -37,7 +37,6 @@ stdenv.mkDerivation rec {
   ];
 
   patches = [
-    ./winapps.patch
     ./setup.patch
   ];
 

packages/winapps/winapps.patch

@@ -1,11 +0,0 @@
---- a/bin/winapps
-+++ b/bin/winapps
-@@ -295,7 +295,7 @@ function waCheckGroupMembership() {
-     # shellcheck disable=SC2155 # Silence warnings regarding masking return values through simultaneous declaration and assignment.
-     local USER_GROUPS=$(groups "$(whoami)")
-
--    if ! (echo "$USER_GROUPS" | grep -q -E "\blibvirt\b") || ! (echo "$USER_GROUPS" | grep -q -E "\bkvm\b"); then
-+    if ! (echo "$USER_GROUPS" | grep -q -E "\blibvirtd\b") || ! (echo "$USER_GROUPS" | grep -q -E "\bkvm\b"); then
-         waThrowExit "$EC_NOT_IN_GROUP"
-     fi
- }