add config to specify geth command

lib/blockchain.js

@@ -8,6 +8,7 @@ var Blockchain = function(blockchainConfig, Client) {
   this.blockchainConfig = blockchainConfig;
 
   this.config = {
+    geth_bin: this.blockchainConfig.geth_bin || 'geth',
     networkType: this.blockchainConfig.networkType || 'custom',
     genesisBlock: this.blockchainConfig.genesisBlock || false,
     datadir: this.blockchainConfig.datadir || false,

lib/geth_commands.js

@@ -2,6 +2,7 @@
 var GethCommands = function(options) {
   this.config = options.config;
   this.name = "Go-Ethereum (https://github.com/ethereum/go-ethereum)";
+  this.geth_bin = this.config.geth_bin || "geth";
 };
 
 GethCommands.prototype.commonOptions = function() {
@@ -29,7 +30,7 @@ GethCommands.prototype.commonOptions = function() {
 
 GethCommands.prototype.initGenesisCommmand = function() {
   var config = this.config;
-  var cmd = "geth " + this.commonOptions();
+  var cmd = this.geth_bin + " " + this.commonOptions();
 
   if (config.genesisBlock) {
     cmd += "init \"" + config.genesisBlock + "\" ";
@@ -39,16 +40,16 @@ GethCommands.prototype.initGenesisCommmand = function() {
 };
 
 GethCommands.prototype.newAccountCommand = function() {
-  return "geth " + this.commonOptions() + "account new ";
+  return this.geth_bin + " " + this.commonOptions() + "account new ";
 };
 
 GethCommands.prototype.listAccountsCommand = function() {
-  return "geth " + this.commonOptions() + "account list ";
+  return this.geth_bin + " " + this.commonOptions() + "account list ";
 };
 
 GethCommands.prototype.mainCommand = function(address) {
   var config = this.config;
-  var cmd = "geth ";
+  var cmd = this.geth_bin + " ";
   var rpc_api = (this.config.rpcApi || ['eth', 'web3', 'net']);
 
   cmd += this.commonOptions();

test/blockchain.js

@@ -14,6 +14,7 @@ describe('embark.Blockchain', function() {
         var config = {
           networkType: 'custom',
           genesisBlock: false,
+          geth_bin: 'geth',
           datadir: false,
           mineWhenNeeded: false,
           rpcHost: 'localhost',
@@ -41,6 +42,7 @@ describe('embark.Blockchain', function() {
         var config = {
           networkType: 'livenet',
           genesisBlock: 'foo/bar/genesis.json',
+          geth_bin: 'geth',
           datadir: '/foo/datadir/',
           mineWhenNeeded: true,
           rpcHost: 'someserver',