first commit

2026-07-16 00:55:29 +02:00
commit 209f81aa3d
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+#!/bin/bash
+# =============================================================================
+# ram-watchdog.sh - Watchdog memoire pour le photomaton
+# =============================================================================
+# Usage: Lancer via cron toutes les minutes :
+#   * * * * * /home/pi/opencode/scripts/ram-watchdog.sh
+#
+# Actions par seuil :
+#   - Swap > 70% : vider les caches
+#   - Swap > 85% : redemarrer photobooth-app
+#   - Swap > 95% : reboot du Pi
+# =============================================================================
+
+LOG_TAG="ram-watchdog"
+log_info()  { logger -t "$LOG_TAG" "[INFO] $1"; }
+log_warn()  { logger -t "$LOG_TAG" "[WARN] $1"; }
+log_error() { logger -t "$LOG_TAG" "[ERROR] $1"; }
+
+# --- Lire les valeurs memoire ---
+SWAP_TOTAL=$(awk '/SwapTotal/ {print $2}' /proc/meminfo)
+SWAP_FREE=$(awk '/SwapFree/ {print $2}' /proc/meminfo)
+MEM_AVAILABLE=$(awk '/MemAvailable/ {print $2}' /proc/meminfo)
+
+# Eviter division par zero
+if [ "$SWAP_TOTAL" -eq 0 ]; then
+    exit 0
+fi
+
+SWAP_USED=$((SWAP_TOTAL - SWAP_FREE))
+SWAP_PERCENT=$((SWAP_USED * 100 / SWAP_TOTAL))
+MEM_AVAILABLE_MB=$((MEM_AVAILABLE / 1024))
+
+# --- Seuil 1 : Swap > 70% -> vider les caches ---
+if [ "$SWAP_PERCENT" -ge 70 ] && [ "$SWAP_PERCENT" -lt 85 ]; then
+    log_warn "Swap a ${SWAP_PERCENT}% (RAM dispo: ${MEM_AVAILABLE_MB}Mo) - Vidage des caches"
+    sync
+    echo 3 > /proc/sys/vm/drop_caches 2>/dev/null || true
+fi
+
+# --- Seuil 2 : Swap > 85% -> redemarrer photobooth-app ---
+if [ "$SWAP_PERCENT" -ge 85 ] && [ "$SWAP_PERCENT" -lt 95 ]; then
+    log_error "Swap a ${SWAP_PERCENT}% (RAM dispo: ${MEM_AVAILABLE_MB}Mo) - Redemarrage photobooth-app"
+
+    # Redemarrer photobooth-app en tant que l'utilisateur pi
+    REAL_USER="pi"
+    XDG_RUNTIME_DIR="/run/user/$(id -u "$REAL_USER")"
+    DBUS_SESSION_BUS_ADDRESS="unix:path=${XDG_RUNTIME_DIR}/bus"
+
+    runuser -u "$REAL_USER" -- env \
+        XDG_RUNTIME_DIR="$XDG_RUNTIME_DIR" \
+        DBUS_SESSION_BUS_ADDRESS="$DBUS_SESSION_BUS_ADDRESS" \
+        systemctl --user restart photobooth-app 2>/dev/null || true
+
+    log_warn "photobooth-app redemarre"
+
+    # Attendre et vider les caches
+    sleep 5
+    sync
+    echo 3 > /proc/sys/vm/drop_caches 2>/dev/null || true
+fi
+
+# --- Seuil 3 : Swap > 95% -> reboot ---
+if [ "$SWAP_PERCENT" -ge 95 ]; then
+    log_error "CRITIQUE: Swap a ${SWAP_PERCENT}% (RAM dispo: ${MEM_AVAILABLE_MB}Mo) - REBOOT"
+    sync
+    sleep 2
+    reboot
+fi