Paper fork: harden latest.log tailing across rotation/restart

- Detect inode changes and truncation in tail_log
- Reopen latest.log automatically when Paper recreates log file
- Prevent lost trigger parsing after server restarts

mc_aigod_paper.py

@@ -6,7 +6,7 @@ validates targets, and executes commands via RCON.
 Config: /etc/mc_aigod.json
 """
 
-import json, random, re, socket, struct, threading, time, logging
+import json, os, random, re, socket, struct, threading, time, logging
 from collections import deque
 from datetime import datetime
 import requests
@@ -1534,14 +1534,34 @@ def divine_intervention_loop(config):
 # ---------------------------------------------------------------------------
 
 def tail_log(log_path):
-    with open(log_path, 'r') as f:
-        f.seek(0, 2)
-        while True:
-            line = f.readline()
-            if line:
-                yield line
-            else:
-                time.sleep(0.2)
+    """
+    Follow latest.log robustly across truncation/rotation.
+    Paper can recreate latest.log on restart; we detect inode changes and reopen.
+    """
+    f = open(log_path, 'r')
+    f.seek(0, 2)
+    current_inode = os.fstat(f.fileno()).st_ino
+
+    while True:
+        line = f.readline()
+        if line:
+            yield line
+            continue
+
+        # No new line yet; check for rotation/truncation
+        try:
+            st = os.stat(log_path)
+            if st.st_ino != current_inode or st.st_size < f.tell():
+                f.close()
+                f = open(log_path, 'r')
+                current_inode = os.fstat(f.fileno()).st_ino
+                f.seek(0, 2)
+                log.info("Reattached log tail after latest.log rotation/truncation")
+        except FileNotFoundError:
+            # During restart, file may not exist briefly
+            pass
+
+        time.sleep(0.2)
 
 # ---------------------------------------------------------------------------
 # Main