bundles/apt: introduce restart_triggers (restart services if another service has been upgraded)

bundles/apt/files/upgrade-and-reboot

@@ -74,4 +74,19 @@ then
     date | mail -s "SYSREBOOTNOW ${node.name}" ${data['mail']}
 % endif
     systemctl reboot
+% if restart_triggers
+else
+% for affected, restarts in sorted(restart_triggers.items()):
+    up_since=$(systemctl show "${affected}" | sed -n 's/^ActiveEnterTimestamp=//p' || echo 0)
+    up_since_ts=$(date -d "$up_since" +%s || echo 0)
+    now=$(date +%s)
+
+    if [ $((now - up_since_ts)) -lt 3600 ]
+    then
+% for restart in sorted(restarts):
+        systemctl restart "${restart}" || true
+% endfor
+    fi
+% endfor
+% endif
 fi

bundles/apt/items.py

@@ -33,6 +33,7 @@ files = {
         'context': {
             'clean_old_kernels': node.metadata.get('apt/clean_old_kernels', True),
             'data': node.metadata.get('apt/unattended-upgrades', {}),
+            'restart_triggers': node.metadata.get('apt/restart_triggers', {}),
         }
     },
     '/etc/cloud': {