feat: Allow getting logfile path from config (#7044)

* feat(log): allow getting logfile path from config

fixes #5498

* feat(log): ensure logfile directory is created before running

loader.js

@@ -7,6 +7,7 @@ var path = require('path');
 var fork = require('child_process').fork;
 var async = require('async');
 var logrotate = require('logrotate-stream');
+var mkdirp = require('mkdirp');
 
 var file = require('./src/file');
 var pkg = require('./package.json');
@@ -18,7 +19,14 @@ nconf.argv().env().file({
 });
 
 var	pidFilePath = path.join(__dirname, 'pidfile');
-var outputLogFilePath = path.join(__dirname, 'logs/output.log');
+
+var outputLogFilePath = path.join(__dirname, nconf.get('logFile') || 'logs/output.log');
+
+var logDir = path.dirname(outputLogFilePath);
+if (!fs.existsSync(logDir)) {
+	mkdirp.sync(path.dirname(outputLogFilePath));
+}
+
 var output = logrotate({ file: outputLogFilePath, size: '1m', keep: 3, compress: true });
 var silent = nconf.get('silent') === 'false' ? false : nconf.get('silent') !== false;
 var numProcs;