Inject a admin account on a magento 1.x installation

inject-magento-admin-1x.php

<?php

$mageFilename = 'public/app/Mage.php';
if (!file_exists($mageFilename)) {
    echo $mageFilename." was not found";
    exit;
}
require_once $mageFilename;
Mage::app();

try {
    //create new user by providing details below
    $user = Mage::getModel('admin/user')
        ->setData(array(
            'username'  => 'eivin.landa',
            'firstname' => 'Eivin',
            'lastname'  => 'Landa',
            'email'     => '[email protected]',
            'password'  => 'asd2g74fSasdyn14Ho9pLnDmzU123fo',
            'is_active' => 1
        ))->save();

} catch (Exception $e) {
    echo $e->getMessage();
    exit;
}

try {
    //create new role
    $role = Mage::getModel("admin/roles")
            ->setName('eivin.landa')
            ->setRoleType('G')
            ->save();

    //give "all" privileges to role
    Mage::getModel("admin/rules")
            ->setRoleId($role->getId())
            ->setResources(array("all"))
            ->saveRel();

} catch (Mage_Core_Exception $e) {
    echo $e->getMessage();
    exit;
} catch (Exception $e) {
    echo 'Error while saving role.';
    exit;
}

try {
    //assign user to role
    $user->setRoleIds(array($role->getId()))
        ->setRoleUserId($user->getUserId())
        ->saveRelations();

} catch (Exception $e) {
    echo $e->getMessage();
    exit;
}
echo "Done\n";