Stop plex service with the s6 supervisor (#53)

S6 will now send SIGTERM to the root Plex process as a part of the service's finish script.  If the processes don't exit after 5 seconds, all processes are sent a SIGKILL

root/etc/services.d/plex/finish

@@ -0,0 +1,18 @@
+#!/usr/bin/with-contenv bash
+# Copied from the init.d stop method from non-Dockerized Plex.
+
+echo "Stopping Plex Media Server."
+
+# Ask nicely
+pids="$(ps -ef | grep 'Plex Media Server' | grep -v grep | awk '{print $2}')"
+kill -15 $pids
+
+sleep 5
+
+# Stuck
+pids="$(ps -ef | grep /usr/lib/plexmediaserver | grep -v grep | awk '{print $2}')"
+
+if [ "$pids" != "" ]; then
+  kill -9 $pids
+  sleep 2
+fi

root/etc/services.d/plex/timeout-finish

@@ -0,0 +1 @@
+8000

root/plex_service.sh

@@ -0,0 +1,7 @@
+#!/bin/bash
+
+if [ "$#" -eq 1 ]; then
+  s6-svc "$1" /var/run/s6/services/plex
+else
+  echo "No argument supplied; must be -u, -d, or -r."
+fi