Both --input and --url are optional (#24)

- They are no longer mutually exclusive
- Input-independent default graph-cache location - `/data/default-gh'
- Resolve #23

Technical changes:
- Simplify handling: of script variables and their defaults
   - Remove complex configuration handling and copy
   - Remove unused variables
- Modify "our" copy of `config-example.yml` to enable http connections from outside of the container
- Update and clarify the help text

graphhopper.sh

@@ -17,21 +17,20 @@ echo "## using java $vers from $JAVA_HOME"
 
 function printBashUsage {
   echo "$(basename $0): Start a Gpahhopper server."
-  echo "user access at 0.0.0.0:8989 and API access at 0.0.0.0:8989/route"
+  echo "Default user access at 0.0.0.0:8989 and API access at 0.0.0.0:8989/route"
   echo ""
   echo "Usage"
-  echo "$(basename $0) -i | --input <file> [<parameter> ...] "
-  echo "$(basename $0) --url <url> [<parameter> ...] "
+  echo "$(basename $0) [<parameter> ...] "
   echo ""
   echo "parameters:"
-  echo "--import                  only create the graph cache, to be used later for faster starts"
-  echo "-c | --config <config>    specify the application configuration"
-  echo "-i | --input <file>       path to the input file in the file system"
+  echo "-i | --input <osm-file>   OSM local input file location"
   echo "--url <url>               download input file from a url and save as data.pbf"
+  echo "--import                  only create the graph cache, to be used later for faster starts"
+  echo "-c | --config <config>    application configuration file location"
   echo "-o | --graph-cache <dir>  directory for graph cache output"
   echo "-p | --profiles <string>  comma separated list of vehicle profiles"
-  echo "--port <port>             start web server at the given port rather than 8989"
-  echo "--host <host>             specify to which host the service should be bound rather than 0.0.0.0"
+  echo "--port <port>             port for web server [default: 8989]"
+  echo "--host <host>             host address of the web server [default: 0.0.0.0]"
   echo "-h | --help               display this message"
 }
 
@@ -55,49 +54,21 @@ while [ ! -z $1 ]; do
   esac
 done
 
+# Defaults
 : "${ACTION:=server}"
-
-if [[ "$CONFIG" == *properties ]]; then
- echo "$CONFIG not allowed as configuration. Use yml"
- exit
-fi
-
-# default init, https://stackoverflow.com/a/28085062/194609
-: "${CONFIG:=config.yml}"
-if [[ -f $CONFIG && $CONFIG != config.yml ]]; then
-  echo "Copying non-default config file: $CONFIG"
-  cp $CONFIG config.yml
-fi
-if [ ! -f "config.yml" ]; then
-  echo "No config file was specified, using config-example.yml"
-  cp config-example.yml $CONFIG
-fi
-
-if [ "$URL" != "" ]; then
-  wget -S -nv -O "data.pbf" "$URL"
-  FILE="data.pbf"
-fi
-
-if [ "$FILE" = "" ]; then
-  echo -e "No file or url were specified."
-  printBashUsage
-  exit 2
-fi
-
-# DATA_DIR = directories path to the file if any (if current directory, return .)
-DATADIR=$(dirname "${FILE}")
-# create the directories if needed
-mkdir -p $DATADIR
-# BASENAME = filename (file without the directories)
-BASENAME=$(basename "${FILE}")
-# NAME = file without extension if any
-NAME="${BASENAME%.*}"
-
+: "${GRAPH:=/data/default-gh}"
+: "${CONFIG:=config-example.yml}"
 : "${JAVA_OPTS:=-Xmx1g -Xms1g}"
 : "${JAR:=$(find . -type f -name "*.jar")}"
-: "${GRAPH:=$DATADIR/$NAME-gh}"
+
+if [ "$URL" != "" ]; then
+  wget -S -nv -O "${FILE:=data.pbf}" "$URL"
+fi
+
+# create the directories if needed
+mkdir -p $(dirname "${GRAPH}")
 
 echo "## Executing $ACTION. JAVA_OPTS=$JAVA_OPTS"
 
-exec "$JAVA" $JAVA_OPTS -Ddw.graphhopper.datareader.file="$FILE" -Ddw.graphhopper.graph.location="$GRAPH" \
+exec "$JAVA" $JAVA_OPTS ${FILE:+-Ddw.graphhopper.datareader.file="$FILE"} -Ddw.graphhopper.graph.location="$GRAPH" \
         $GH_WEB_OPTS -jar "$JAR" $ACTION $CONFIG