first

lib/system.sh

@@ -0,0 +1,59 @@
+#!/usr/bin/env bash
+
+system_require_bash() {
+  if [[ -z "${BASH_VERSION:-}" ]]; then
+    printf 'Bash est requis.\n' >&2
+    exit 1
+  fi
+}
+
+system_require_debian() {
+  if [[ ! -r /etc/os-release ]]; then
+    ui_error "Impossible de detecter le systeme"
+    exit 1
+  fi
+
+  if ! grep -Eq '^ID=debian$|^ID_LIKE=.*debian' /etc/os-release; then
+    ui_error "Ce script cible Debian"
+    exit 1
+  fi
+
+  ui_success "Systeme Debian detecte"
+}
+
+system_require_root() {
+  if [[ "${EUID:-$(id -u)}" -ne 0 ]]; then
+    ui_error "Relancer ce script avec sudo ou en root"
+    exit 1
+  fi
+
+  ui_success "Privileges root valides"
+}
+
+system_user_exists() {
+  local user_name="$1"
+  id "$user_name" >/dev/null 2>&1
+}
+
+system_group_exists() {
+  local group_name="$1"
+  getent group "$group_name" >/dev/null 2>&1
+}
+
+system_user_in_group() {
+  local user_name="$1"
+  local group_name="$2"
+  id -nG "$user_name" 2>/dev/null | tr ' ' '\n' | grep -Fx "$group_name" >/dev/null 2>&1
+}
+
+system_primary_interface() {
+  ip route get 1.1.1.1 2>/dev/null | awk '
+    /dev/ {
+      for (i = 1; i <= NF; i++) {
+        if ($i == "dev") {
+          print $(i + 1)
+          exit
+        }
+      }
+    }'
+}