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gaia/tests/jsmarionette/runner/mozilla-profile-builder/lib/options/settings.js

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+'use strict';
+/** handles mutation of settings.json */
+var SETTINGS = 'settings.json';
+var PERMISSIONS_DB = 'permissions.sqlite';
+
+var fs = require('fs'),
+    fsPath = require('path');
+
+/**
+ * Updates the settings.json file of a given profile
+ *
+ * @param {String} profile path.
+ * @param {Options} options with .settings.
+ * @param {Function} callback [Error err, profile].
+ */
+function settings(profile, options, callback) {
+  if (!options || !options.settings) {
+    return process.nextTick(callback.bind(null, null, profile));
+  }
+
+  // location of settings.json
+  var settingsPath = fsPath.join(profile, SETTINGS);
+  // location of permissions
+  var permissionsPath = fsPath.join(profile, PERMISSIONS_DB);
+
+  function readSettings() {
+    fs.readFile(settingsPath, 'utf8', function(err, content) {
+      var json;
+      try {
+        json = JSON.parse(content);
+      } catch (e) {
+        return callback(e);
+      }
+
+      writeSettings(json);
+    });
+  }
+
+  function writeSettings(original) {
+    // copy new settings over
+    var newSettings = options.settings;
+    for (var name in newSettings) {
+      original[name] = newSettings[name];
+    }
+
+    var pending = 2;
+    function next(err) {
+      if (err) {
+        callback && callback(err);
+        callback = null;
+      }
+
+      if (--pending === 0)
+        callback(null, profile);
+    }
+
+    fs.exists(permissionsPath, function(itDoes) {
+      if (!itDoes)
+        return next();
+
+      fs.unlink(permissionsPath, next);
+    });
+
+    // and finally write the file back out
+    fs.writeFile(
+      settingsPath,
+      // slows it down a but but makes it readable!
+      JSON.stringify(original, null, 2),
+      next
+    );
+  }
+
+  // check if file exists
+  fs.exists(settingsPath, function(fileExists) {
+    if (fileExists) {
+      // when file exists read it then write
+      readSettings();
+    } else {
+      // otherwise simply write
+      writeSettings({});
+    }
+  });
+}
+
+module.exports = settings;