add 30s connectivity check with auto-rollback to setup-network.sh

setup-network.sh

@@ -8,12 +8,27 @@ CYAN='\033[0;36m'
 NC='\033[0m'
 
 info()   { echo -e "${GREEN}[+]${NC} $*"; }
+check_deps() {
+    local missing=()
+    for cmd in "$@"; do
+        if ! command -v "$cmd" >/dev/null 2>&1; then
+            missing+=("$cmd")
+        fi
+    done
+    if [ ${#missing[@]} -gt 0 ]; then
+        die "Missing required dependencies: ${missing[*]}"
+    fi
+}
+
+
 warn()   { echo -e "${YELLOW}[!]${NC} $*"; }
 die()    { echo -e "${RED}[ERROR]${NC} $*" >&2; exit 1; }
 header() { echo -e "\n${CYAN}══════════════════════════════════════════${NC}"; echo -e "${CYAN}  $*${NC}"; echo -e "${CYAN}══════════════════════════════════════════${NC}"; }
 
 [ "$(id -u)" -eq 0 ] || die "Run as root"
 
+check_deps ip netplan systemctl
+
 header "TinyBoard Network Setup"
 
 info "Available interfaces:"
@@ -105,8 +120,9 @@ fi
 
 header "Writing Netplan Config"
 if [ -f "$NETPLAN_FILE" ]; then
-    cp "$NETPLAN_FILE" "${NETPLAN_FILE}.bak"
-    info "Backup saved to ${NETPLAN_FILE}.bak"
+    BACKUP_FILE="/root/$(basename "${NETPLAN_FILE}").bak"
+    cp "$NETPLAN_FILE" "$BACKUP_FILE"
+    info "Backup saved to $BACKUP_FILE"
 fi
 
 if $IS_WIFI; then
@@ -148,12 +164,29 @@ fi
 info "Netplan config written to $NETPLAN_FILE"
 
 header "Applying Configuration"
-warn "Testing netplan config..."
-if netplan try --timeout 10 2>/dev/null; then
-    info "Netplan config applied successfully."
-else
-    warn "netplan try timed out or failed — applying anyway..."
+warn "Testing netplan config with 30 second rollback window..."
+netplan try --timeout 30 &
+NETPLAN_PID=$!
+
+STATIC_ADDR_TEST="${STATIC_IP%%/*}"
+CONNECTED=false
+for i in $(seq 1 6); do
+    sleep 5
+    if ping -c 1 -W 2 "$GATEWAY" >/dev/null 2>&1; then
+        CONNECTED=true
+        break
+    fi
+    warn "Network check $i/6 failed, retrying..."
+done
+
+if $CONNECTED; then
+    info "Network connectivity confirmed — applying config permanently."
     netplan apply
+else
+    warn "No network connectivity detected after 30 seconds — reverting to previous config."
+    kill "$NETPLAN_PID" 2>/dev/null || true
+    wait "$NETPLAN_PID" 2>/dev/null || true
+    die "Config reverted. Check your settings and try again."
 fi
 
 STATIC_ADDR="${STATIC_IP%%/*}"