Fixed repo cloning logic for live validator

ChangeLog.md

@@ -1,3 +1,6 @@
+### 08/03/2017 0.4.8
+ - [Live Validator] Before cloning the rest api specs repo if directory named 'repo' exists we delete it and then create an empty directory to clone repo inside it.
+ 
 ### 07/11/2017 0.4.7
  - Fixed Live validator for reorg branch of azure-rest-api-specs #137
  

lib/util/utils.js

@@ -437,14 +437,28 @@ exports.gitClone = function gitClone(url, directory) {
 
   // If the directory exists then we assume that the repo to be cloned is already present.
   if (fs.existsSync(directory)) {
-    if (!fs.lstatSync(directory).isDirectory()) {
-      throw new Error(`"${directory}" must be a directory.`);
+    if (fs.lstatSync(directory).isDirectory()) {
+      try {
+        exports.removeDirSync(directory);
+      } catch (err) {
+        throw new Error(`An error occurred while deleting directory ${directory}: ${util.inspect(err, { depth: null })}.`);
+      }
+    } else {
+      try {
+        fs.unlinkSync(directory);
+      } catch (err) {
+        throw new Error(`An error occurred while deleting file ${directory}: ${util.inspect(err, { depth: null })}.`);
+      }
     }
-    return;
-  } else {
-    fs.mkdirSync(directory);
   }
 
+  try {
+    fs.mkdirSync(directory);
+  } catch (err) {
+    throw new Error(`An error occurred while creating directory ${directory}: ${util.inspect(err, { depth: null })}.`);
+  }
+
+
   try {
     let cmd = `git clone ${url} ${directory}`;
     let result = execSync(cmd, { encoding: 'utf8' });
@@ -453,6 +467,21 @@ exports.gitClone = function gitClone(url, directory) {
   }
 };
 
+/*
+ * Removes given directory recursively.
+ * @param {string} dir directory to be deleted.
+ */
+exports.removeDirSync = function removeDirSync(dir) {
+  if (fs.existsSync(dir)) {
+    fs.readdirSync(dir).forEach(function (file) {
+      var current = dir + '/' + file;
+      if (fs.statSync(current).isDirectory()) exports.removeDirSync(current);
+      else fs.unlinkSync(current);
+    })
+    fs.rmdirSync(dir);
+  }
+}
+
 /*
  * Finds the first content-type that contains "/json". Only supported Content-Types are 
  * "text/json" & "application/json" so we perform first best match that contains '/json'

package.json

@@ -1,6 +1,6 @@
 {
   "name": "oav",
-  "version": "0.4.7",
+  "version": "0.4.8",
   "author": {
     "name": "Microsoft Corporation",
     "email": "azsdkteam@microsoft.com",