Add option to only download binary

Author: vrde

cli.js

@@ -9,17 +9,16 @@ const packageJson = require("./package.json");
 
 var noAction = true;
 
-function workdir() {
-  if (program.workdir) {
-    return program.workdir;
-  } else {
-    const tmpDir = os.tmpdir();
-    return fs.mkdtempSync(`${tmpDir}${sep}`);
-  }
+function getOptions(program) {
+  return {
+    workdir: program.workdir || fs.mkdtempSync(`${os.tmpdir()}${sep}`),
+    download: program.download
+  };
 }
 
 program
   .version(packageJson.version)
+  .option("-d, --download", "Download the Ethereum client and exit.")
   .option("-w, --workdir <dir>", "Specify a working dir.");
 
 program.version(packageJson.version);
@@ -29,19 +28,19 @@ program
   .description("Run a Parity development node.")
   .action(cmd => {
     noAction = false;
-    run("parity", workdir());
+    run("parity", getOptions(program));
   });
 
 program
   .command("geth")
   .description("Run a Geth development node.")
   .action(cmd => {
     noAction = false;
-    run("geth", workdir());
+    run("geth", getOptions(program));
   });
 
 program.parse(process.argv);
 
 if (noAction) {
-  run("geth", workdir());
+  run("geth", getOptions(program));
 }

main.js

@@ -57,7 +57,7 @@ function generateBalances(keypairs, balance) {
   return balances;
 }
 
-function setup(client, workdir) {
+function downloadClient(client, workdir) {
   const paths = getPaths(client, workdir);
   if (!fs.existsSync(paths.binary)) {
     console.log(`Download latest ${client} version, please wait.`);
@@ -108,9 +108,12 @@ function provide(client, workdir) {
   }
 }
 
-function run(client, workdir) {
+function run(client, { download, workdir }) {
   const paths = getPaths(client, workdir);
-  setup(client, workdir);
+  downloadClient(client, workdir);
+  if (download) {
+    return;
+  }
   if (!fs.existsSync(paths.genesis)) {
     provide(client, workdir);
   }

package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "ethnode",
-  "version": "0.0.10",
+  "version": "0.0.11",
   "description": "Run an Ethereum node for development.",
   "homepage": "https://github.com/vrde/ethnode",
   "main": "main.js",