Refactor EPG scheduling: replace CRON_SCHEDULE with GRAB_INTERVAL_HOURS for improved interval-based grabbing and add lock mechanism to prevent concurrent executions.

Dockers/iptv-epg/entrypoint.sh

@@ -56,6 +56,11 @@ grab_epg() {
 }
 
 if [ "$1" = "grab" ]; then
+    if ! mkdir /tmp/epg-grab.lock 2>/dev/null; then
+        echo "EPG grab already running, skipping"
+        exit 0
+    fi
+    trap 'rmdir /tmp/epg-grab.lock 2>/dev/null || true' EXIT INT TERM
     grab_epg
     exit 0
 fi
@@ -67,24 +72,17 @@ if [ -n "$SITES" ]; then
     grab_epg
 fi
 
-if [ -n "$CRON_SCHEDULE" ] && [ -n "$SITES" ]; then
-    echo "Setting up cron job with schedule: $CRON_SCHEDULE"
-    # Cron runs with a minimal env — bake grab-related vars into a wrapper script.
-    {
-        echo '#!/bin/sh'
-        echo 'cd /app'
-        for var in SITES OUTPUT MAX_CONNECTIONS DAYS TIMEOUT DELAY LANG PROXY GZIP JSON CURL; do
-            eval "val=\$$var"
-            if [ -n "$val" ]; then
-                printf "export %s='%s'\n" "$var" "$(printf '%s' "$val" | sed "s/'/'\\\\''/g")"
-            fi
+if [ -n "$SITES" ] && [ "${GRAB_INTERVAL_HOURS:-0}" -gt 0 ] 2>/dev/null; then
+    echo "Scheduling EPG grab every ${GRAB_INTERVAL_HOURS} hours"
+    (
+        while true; do
+            sleep $((GRAB_INTERVAL_HOURS * 3600))
+            echo "Starting scheduled EPG grab at $(date -u '+%Y-%m-%d %H:%M:%S UTC' 2>/dev/null || date)"
+            /app/entrypoint.sh grab
         done
-        echo 'exec /app/entrypoint.sh grab'
-    } >/app/run-grab.sh
-    chmod +x /app/run-grab.sh
-    echo "$CRON_SCHEDULE /app/run-grab.sh >> /proc/1/fd/1 2>&1" >/etc/crontabs/root
-    chmod 600 /etc/crontabs/root
-    crond -b -l 2
+    ) &
+elif [ -n "$CRON_SCHEDULE" ]; then
+    echo "WARNING: CRON_SCHEDULE is deprecated, use GRAB_INTERVAL_HOURS instead (ignored)"
 fi
 
 echo "Starting server on port 3000 to serve EPG files from /app/guides"