use spawn with detached

lib/api.js

@@ -5,7 +5,7 @@ const fs = require('fs');
 const {statSync, readFileSync} = require('fs');
 const stripJsonComments = require('strip-json-comments');
 const JsonLogger = require('kad-logger-json');
-const {fork} = require('child_process');
+const {spawn} = require('child_process');
 const utils = require('./utils');
 const path = require('path');
 
@@ -20,6 +20,7 @@ class RPC {
   constructor(options={}) {
     this.logger = new JsonLogger(options.logVerbosity);
     this.shares = new Map();
+    this._execPath = options.execPath || 'node';
   }
 
   /**
@@ -98,9 +99,9 @@ class RPC {
       let uptimeCounter = setInterval(() => share.meta.uptimeMs += 1000, 1000);
 
       // NB: Fork the actual farmer process, passing it the configuration
-      share.process = fork(
-        path.join(__dirname, '../script/farmer.js'),
-        ['--config', configPath],
+      share.process = spawn(
+        self._execPath,
+        [path.join(__dirname, '../script/farmer.js'), '--config', configPath],
         {
           stdio: [0, 'pipe', 'pipe', 'ipc'],
           detached: false