Allow passing arguments directly to Ethereum node (#21)

* Allow passing arguments directly to Ethereum node

- Fixes #19

* Problem: Error when --nodeArguments are missing

Make sure to pass no arguments when nodeArguments value is falsy.

cli.js

@@ -15,6 +15,7 @@ function getOptions(program) {
     allocate: program.allocate,
     chainId: program.chainid,
     execute: program.execute,
+    nodeArguments: program.nodeArguments
   };
 }
 
@@ -46,6 +47,10 @@ program
   .option(
     "-e, --execute <command>",
     "Start ethnode, execute command, and exit ethnode (useful for testing)."
+  )
+  .option(
+    "--node-arguments <args>",
+    "Arguments that are passed directly to ethnode's underlying Ethereum node."
   );
 
 program.version(packageJson.version);

main.js

@@ -157,7 +157,7 @@ async function provide(
 
 async function run(
   client,
-  { download, workdir, logging, allocate, chainId, execute }
+  { download, workdir, logging, allocate, chainId, execute, nodeArguments }
 ) {
   const loggingOptions = logging
     ? client === "geth"
@@ -269,6 +269,8 @@ async function run(
     throw `Client "${client}" is not supported`;
   }
 
+  if (nodeArguments) args.push(nodeArguments);
+
   if (logging === "debug") {
     console.log("running:", paths.binary, args.join(" "));
   }