ircbot: Restart on failure, do not self-exec if running under systemd

ircbot.sh

@@ -22,7 +22,15 @@ connect() {
     echo "PRIVMSG $chan : $joinmsg" >> $inputf
 }
 reconnect() {
-    exec $0
+    if command -v systemctl >/dev/null; then
+        # NOTE: systemd is configured to restart the service, so simply dying
+        #       with a non-zero exit code is enough to effectively reconnect.
+        exit 2
+    else
+        # FIXME: We need to make sure we are only running one instance of the
+        #        script at a time. This exec is therefore problematic.
+        exec $0
+    fi
 }
 delay() {
     while read line

services/systemd/ircbot.service

@@ -5,6 +5,7 @@ Description=Anarchyplanet IRC Bot
 User=nagios
 Group=nagios
 ExecStart=/usr/local/bin/ircbot.sh
+Restart=on-failure
 
 [Install]
 WantedBy=multi-user.target