feat: multi environnemnt desktop

[180][WIP]

configs/releng/airootfs/usr/local/bin/fws-desktop-init-common

@@ -0,0 +1,56 @@
+#!/bin/bash
+set -euo pipefail
+
+fws_first_user() {
+    awk -F: '$3 >= 1000 && $1 != "nobody" { print $1; exit }' /etc/passwd
+}
+
+fws_install_packages() {
+    pacman -Sy --noconfirm --needed "$@"
+}
+
+fws_enable_services() {
+    for service in "$@"; do
+        systemctl enable "$service" >/dev/null 2>&1 || true
+    done
+}
+
+
+fws_disable_services() {
+    for service in "$@"; do
+        systemctl disable "$service" >/dev/null 2>&1 || true
+    done
+}
+
+fws_write_dmrc() {
+    local user_name="$1"
+    local session_name="$2"
+
+    if [ -n "$user_name" ] && [ -d "/home/$user_name" ]; then
+        printf '[Desktop]\nSession=%s\n' "$session_name" > "/home/$user_name/.dmrc"
+    fi
+}
+
+fws_write_lightdm_config() {
+    local user_name="$1"
+    local session_name="$2"
+
+    if [ -z "$user_name" ]; then
+        return 0
+    fi
+
+    mkdir -p /etc/lightdm/lightdm.conf.d
+    printf '[Seat:*]\nautologin-user=%s\nautologin-user-timeout=0\nuser-session=%s\nautologin-session=%s\ngreeter-hide-users=true\nallow-guest=false\n' "$user_name" "$session_name" "$session_name" > /etc/lightdm/lightdm.conf.d/50-fws.conf
+}
+
+fws_write_sddm_config() {
+    local user_name="$1"
+    local session_name="$2"
+
+    if [ -z "$user_name" ]; then
+        return 0
+    fi
+
+    mkdir -p /etc/sddm.conf.d
+    printf '[Autologin]\nUser=%s\nSession=%s.desktop\nRelogin=false\n' "$user_name" "$session_name" > /etc/sddm.conf.d/50-fws.conf
+}