Audit Log items, backend stuff, help pages

src/backend/lib/error.js

@@ -50,6 +50,15 @@ module.exports = {
         this.public   = false;
     },
 
+    ConfigurationError: function (message, previous) {
+        Error.captureStackTrace(this, this.constructor);
+        this.name = this.constructor.name;
+        this.previous = previous;
+        this.message = message;
+        this.status = 400;
+        this.public = true;
+    },
+
     CacheError: function (message, previous) {
         Error.captureStackTrace(this, this.constructor);
         this.name     = this.constructor.name;

src/backend/lib/utils.js

@@ -0,0 +1,22 @@
+'use strict';
+
+const exec = require('child_process').exec;
+
+module.exports = {
+
+    /**
+     * @param   {String} cmd
+     * @returns {Promise}
+     */
+    exec: function (cmd) {
+        return new Promise((resolve, reject) => {
+            exec(cmd, function (err, stdout, stderr) {
+                if (err && typeof err === 'object') {
+                    reject(err);
+                } else {
+                    resolve(stdout.trim());
+                }
+            });
+        });
+    }
+};