Added example env file for systemd

Signed-off-by: Andrew DeMaria <lostonamountain@gmail.com>

contrib/airsonic-systemd-env

@@ -0,0 +1,31 @@
+# Set the location of the standalone war to use
+#JAVA_JAR=/var/airsonic/airsonic.war
+
+# Set any java opts separated by spaces
+#JAVA_OPTS=-Xmx700m
+
+# Set a different location for airsonic home. 
+# If this path is /var/libresonic or even contains "libresonic",
+# the data from a previous libresonic can be used as is (i.e. without
+# renaming libresonic.properties,db/libresonic*,etc
+#AIRSONIC_HOME=/var/airsonic
+
+# Change the port to listen on
+#PORT=8080
+
+# Change the path that is listened on
+#CONTEXT_PATH=/airsonic
+
+# Add any java args. These are different than JAVA_OPTS in that 
+# they are passed directly to the program. The default is empty:
+#JAVA_ARGS=
+
+# Note that there are several settings for spring boot, not explicitly listed
+# here, but can be used in either JAVA_OPTS or JAVA_ARGS. The full list
+# can be found here: 
+# https://docs.spring.io/spring-boot/docs/1.4.5.RELEASE/reference/htmlsingle/#common-application-properties
+# For example to set debug across the board:
+#JAVA_ARGS=--debug
+
+# Or to change the ip address that is listened on:
+#JAVA_ARGS=--server.address=127.0.0.1

contrib/airsonic.service

@@ -13,11 +13,11 @@ Environment="CONTEXT_PATH=/airsonic"
 Environment="JAVA_ARGS="
 EnvironmentFile=-/etc/sysconfig/airsonic
 ExecStart=/usr/bin/java \
-          ${JAVA_OPTS} \
+          $JAVA_OPTS \
           -Dairsonic.home=${AIRSONIC_HOME} \
           -Dserver.context-path=${CONTEXT_PATH} \
           -Dserver.port=${PORT} \
-          -jar ${JAVA_JAR} ${JAVA_ARGS}
+          -jar ${JAVA_JAR} $JAVA_ARGS
 User=airsonic
 Group=airsonic