Add a simple smoketest to check whether a commit completely breaks LM…

…S startup. More sophisticated tests to follow.

.github/workflows/00_smoketest.yaml

@@ -0,0 +1,12 @@
+name: 'Smoketest for Logitech Media Server'
+on: [push, pull_request]
+jobs:
+  linux:
+    name: Run LMS to see whether it crashes immediately...
+    runs-on: ubuntu-18.04
+
+    steps:
+      - uses: actions/checkout@v1
+
+      - name: Run test
+        run: bash t/00_smoketest.sh

t/00_smoketest.sh

@@ -0,0 +1,41 @@
+#!/bin/bash
+
+SERVER_LOG=$HOME/server.log
+TIMEOUT=30
+
+function wait_port() {
+	local wait_seconds="${1:-10}"; shift # 10 seconds as default timeout
+
+	until test $((wait_seconds--)) -eq 0 ; do
+		if nc -z localhost 9000 ; then
+			break
+		else
+			sleep 1
+		fi
+	done
+
+	((++wait_seconds))
+}
+
+function finish {
+	kill -9 $NODE_PID 2> /dev/null
+	cat $SERVER_LOG
+	rm $SERVER_LOG
+}
+trap finish EXIT
+
+./slimserver.pl --logfile=$SERVER_LOG &
+NODE_PID=$!
+
+wait_port $TIMEOUT || {
+	echo "Timing out trying to connect to LMS"
+	exit 1;
+}
+
+STATUS=$(curl -m1 -sX POST -d '{"id":0,"params":["",["serverstatus"]],"method":"slim.request"}' http://localhost:9000/jsonrpc.js)
+
+echo $STATUS | jq .
+
+RESULT=$(echo $STATUS | fgrep -q version)
+
+exit $RESULT