Cacher is the code snippet organizer for pro developers

// Make sure that the user should be able to login and delete temp account
Accounts.validateNewUser(function(user) {
  var usr = Accounts.findUserByEmail(user.services.google.email);
  if (usr) {
    Meteor.users.remove(usr._id);
    return true;
  }
  return false;
});

// Merge info from temp account
Accounts.onCreateUser(function(options, user) {
  var usr = Accounts.findUserByEmail(user.services.google.email);
  if (usr) { user = Object.assign({}, usr, user); }
  if (options.profile) { user.profile = options.profile; }
  return user;
});

Template.login.events({
  'click #google-login': function(e, template) {
    Meteor.loginWithGoogle({ requestPermissions: ['email'] }, function(error){
      if (!error) {
        Router.go('/');
      } else {
        alert('You do not have permission to log in.');
      }
    });
  }
});

<template name="login">
  <div class="login-box">
    <h1>Welcome</h1>
    <a href="#" id="google-login"><img src="img/google-signin.png"></a>
  </div>
</template>