Fix #334 - Do not allow fs.link on directories

src/filesystem/implementation.js

@@ -942,6 +942,8 @@ function link_node(context, oldpath, newpath, callback) {
       oldDirectoryData = result;
       if(!_(oldDirectoryData).has(oldname)) {
         callback(new Errors.ENOENT('a component of either path prefix does not exist', oldname));
+      } else if(oldDirectoryData[oldname].type === 'DIRECTORY') {
+        callback(new Errors.EPERM('oldpath refers to a directory'));
       } else {
         find_node(context, newParentPath, read_new_directory_data);
       }

tests/spec/fs.link.spec.js

@@ -69,4 +69,18 @@ describe('fs.link', function() {
       });
     });
   });
+
+  it('should not allow links to a directory', function(done) {
+    var fs = util.fs();
+
+    fs.mkdir('/mydir', function(error) {
+      if(error) throw error;
+
+      fs.link('/mydir', '/mydirlink', function(error) {
+        expect(error).to.exist;
+        expect(error.code).to.equal('EPERM');
+        done();
+      });
+    });
+  });
 });