feat(bootstrap): add desktop environment support with configurable DE, DM, and display target

roles/bootstrap/tasks/_desktop.yml

@@ -0,0 +1,48 @@
+---
+- name: Load desktop package definitions
+  ansible.builtin.include_vars:
+    file: desktop.yml
+
+- name: Resolve desktop packages
+  vars:
+    _de: "{{ system_cfg.features.desktop.environment }}"
+    _family_pkgs: "{{ bootstrap_desktop_packages[os_family] | default({}) }}"
+    _de_config: "{{ _family_pkgs[_de] | default({}) }}"
+  ansible.builtin.set_fact:
+    _desktop_groups: "{{ _de_config.groups | default([]) }}"
+    _desktop_packages: "{{ _de_config.packages | default([]) }}"
+
+- name: Validate desktop environment is supported
+  ansible.builtin.assert:
+    that:
+      - (_desktop_groups | length > 0) or (_desktop_packages | length > 0)
+    fail_msg: >-
+      Desktop environment '{{ system_cfg.features.desktop.environment }}'
+      is not defined for os_family '{{ os_family }}'.
+      Supported: {{ (bootstrap_desktop_packages[os_family] | default({})).keys() | join(', ') }}
+    quiet: true
+
+- name: Install desktop package groups
+  when: _desktop_groups | length > 0
+  ansible.builtin.command: >-
+    {{ chroot_command }} dnf --releasever={{ os_version }}
+    --setopt=install_weak_deps=False group install -y {{ _desktop_groups | join(' ') }}
+  register: _desktop_group_result
+  changed_when: _desktop_group_result.rc == 0
+
+- name: Install desktop packages
+  when: _desktop_packages | length > 0
+  vars:
+    _install_commands:
+      RedHat: >-
+        {{ chroot_command }} dnf --releasever={{ os_version }}
+        --setopt=install_weak_deps=False install -y {{ _desktop_packages | join(' ') }}
+      Debian: >-
+        {{ chroot_command }} apt install -y {{ _desktop_packages | join(' ') }}
+      Archlinux: >-
+        pacstrap /mnt {{ _desktop_packages | join(' ') }}
+      Suse: >-
+        {{ chroot_command }} zypper install -y {{ _desktop_packages | join(' ') }}
+  ansible.builtin.command: "{{ _install_commands[os_family] }}"
+  register: _desktop_pkg_result
+  changed_when: _desktop_pkg_result.rc == 0

roles/bootstrap/tasks/main.yml

@@ -34,6 +34,10 @@
     bootstrap_var_key: "{{ 'bootstrap_' + (os | replace('-lts', '') | replace('-', '_')) }}"
   ansible.builtin.include_tasks: "{{ bootstrap_os_task_map[os] }}"
 
+- name: Install desktop environment packages
+  when: system_cfg.features.desktop.enabled | bool
+  ansible.builtin.include_tasks: _desktop.yml
+
 - name: Ensure chroot uses live environment DNS
   ansible.builtin.file:
     src: /run/NetworkManager/resolv.conf

roles/bootstrap/vars/desktop.yml

@@ -0,0 +1,149 @@
+---
+# Per-family desktop environment package definitions.
+# Keyed by os_family -> environment -> groups (dnf groupinstall) / packages.
+# Kept intentionally minimal: base DE + essential tools, no full suites.
+bootstrap_desktop_packages:
+  RedHat:
+    gnome:
+      groups:
+        - workstation-product-environment
+      packages: []
+    kde:
+      groups: []
+      packages:
+        - plasma-desktop
+        - plasma-nm
+        - plasma-pa
+        - plasma-systemmonitor
+        - sddm
+        - konsole
+        - dolphin
+        - kate
+        - kscreen
+        - kde-gtk-config
+        - xdg-user-dirs
+        - xdg-desktop-portal-kde
+        - bluez
+        - pipewire
+        - wireplumber
+    xfce:
+      groups:
+        - xfce-desktop-environment
+      packages:
+        - lightdm
+  Debian:
+    gnome:
+      groups: []
+      packages:
+        - gnome-core
+        - gdm3
+        - gnome-tweaks
+        - xdg-user-dirs
+    kde:
+      groups: []
+      packages:
+        - plasma-desktop
+        - plasma-nm
+        - plasma-pa
+        - sddm
+        - konsole
+        - dolphin
+        - kate
+        - kscreen
+        - xdg-user-dirs
+        - xdg-desktop-portal-kde
+        - bluez
+        - pipewire
+        - wireplumber
+    xfce:
+      groups: []
+      packages:
+        - xfce4
+        - xfce4-goodies
+        - lightdm
+        - xdg-user-dirs
+  Archlinux:
+    gnome:
+      groups: []
+      packages:
+        - gnome
+        - gdm
+        - xdg-user-dirs
+    kde:
+      groups: []
+      packages:
+        - plasma-desktop
+        - plasma-nm
+        - plasma-pa
+        - sddm
+        - konsole
+        - dolphin
+        - kate
+        - kscreen
+        - kde-gtk-config
+        - xdg-user-dirs
+        - xdg-desktop-portal-kde
+        - bluez
+        - pipewire
+        - wireplumber
+    xfce:
+      groups: []
+      packages:
+        - xfce4
+        - xfce4-goodies
+        - lightdm
+        - xdg-user-dirs
+    sway:
+      groups: []
+      packages:
+        - sway
+        - waybar
+        - foot
+        - wofi
+        - greetd
+        - xdg-user-dirs
+        - xdg-desktop-portal-wlr
+        - bluez
+        - pipewire
+        - wireplumber
+    hyprland:
+      groups: []
+      packages:
+        - hyprland
+        - kitty
+        - wofi
+        - waybar
+        - ly
+        - xdg-user-dirs
+        - xdg-desktop-portal-hyprland
+        - polkit-kde-agent
+        - qt5-wayland
+        - qt6-wayland
+        - bluez
+        - pipewire
+        - wireplumber
+  Suse:
+    gnome:
+      groups: []
+      packages:
+        - patterns-gnome-gnome_basic
+        - gdm
+        - xdg-user-dirs
+    kde:
+      groups: []
+      packages:
+        - patterns-kde-kde_plasma
+        - sddm
+        - xdg-user-dirs
+
+# Display manager auto-detection from desktop environment.
+bootstrap_desktop_dm_map:
+  gnome: gdm
+  kde: sddm
+  xfce: lightdm
+  sway: greetd
+  hyprland: ly@tty2
+  cinnamon: lightdm
+  mate: lightdm
+  lxqt: sddm
+  budgie: gdm