From b1b852d82c70759d8c975f005a81817c6536e4ae Mon Sep 17 00:00:00 2001
From: meeb <meeb@meeb.org>
Date: Fri, 27 Aug 2021 17:13:25 +1000
Subject: [PATCH] add check for stale PID file or old processes to gracefully
 handle hard container stop/starts, discussed in #144

---
 config/root/etc/services.d/gunicorn/run | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/config/root/etc/services.d/gunicorn/run b/config/root/etc/services.d/gunicorn/run
index 08f356e8..68a574b6 100755
--- a/config/root/etc/services.d/gunicorn/run
+++ b/config/root/etc/services.d/gunicorn/run
@@ -5,5 +5,20 @@ umask "$UMASK_SET"
 
 cd /app || exit
 
+PIDFILE=/run/app/gunicorn.pid
+
+if [ -f "${PIDFILE}" ]
+then
+    PID=$(cat $PIDFILE)
+    echo "Unexpected PID file exists at ${PIDFILE} with PID: ${PID}"
+    if kill -0 $PID
+    then
+        echo "Killing old gunicorn process with PID: ${PID}"
+        kill -9 $PID
+    fi
+    echo "Removing stale PID file: ${PIDFILE}"
+    rm ${PIDFILE}
+fi
+
 exec s6-setuidgid app \
     /usr/local/bin/gunicorn -c /app/tubesync/gunicorn.py --capture-output tubesync.wsgi:application