Rannig from other paths. Property files to array.

lib/providers/filesystem/index.js

@@ -32,6 +32,12 @@ module.exports.createClient = function(options) {
 
 function FileSystemProvider(options) {
   options = options || {};
+
+  if (!path.isAbsolute(options.root)) {
+    var basePath = path.dirname(path.dirname(require.main.filename));
+    options.root = path.join(basePath, options.root);
+  }
+
   this.root = options.root;
   var exists = fs.existsSync(this.root);
   if (!exists) {
@@ -104,6 +110,11 @@ FileSystemProvider.prototype.getContainers = function(cb) {
   fs.readdir(self.root, function(err, files) {
     var containers = [];
     var tasks = [];
+
+    if (!files) {
+      files = [];
+    }
+
     files.forEach(function(f) {
       tasks.push(fs.stat.bind(fs, path.join(self.root, f)));
     });

test/fs.test.js

@@ -31,6 +31,21 @@ describe('FileSystem based storage provider', function() {
       process.nextTick(done);
     });
 
+    it('should work even it is ran from other path', function(done) {
+      process.chdir('../../../');
+
+      try {
+        console.log(`running from ${process.cwd()}`);
+        client = new FileSystemProvider({
+          root: path.join(__dirname, 'storage'),
+        });
+
+        process.nextTick(done);
+      } catch (error) {
+        process.nextTick(done(error));
+      }
+    });
+
     it('should complain if the root directory doesn\'t exist', function(done) {
       try {
         client = new FileSystemProvider({