Symfony2 Capifony部署时权限被拒绝错误

我正在使用Capifony将Symfony2应用程序部署到我的服务器上，并且已经使用它几个月了。然而，今天当我部署到我的服务器时，我突然开始得到权限拒绝错误!我以前从未有过这些，我没有改变过服务器的任何权限，事实上，我只部署了一个小时左右，它很好吗?!下面是一个错误示例:

** [out :: xx.xxx.xxx.xxx] 
 ** [out :: xx.xxx.xxx.xxx] rm:
 ** [out :: xx.xxx.xxx.xxx] cannot remove `/var/www/vhosts/xyz.co.uk/releases/20130604203446/web/bundles/website/lib/frontend/img/blog/pop-2.jpg': Permission denied
 ** [out :: xx.xxx.xxx.xxx] 
 ** [out :: xx.xxx.xxx.xxx] rm:
 ** [out :: xx.xxx.xxx.xxx] cannot remove `/var/www/vhosts/xyz.co.uk/releases/20130604203446/web/bundles/website/lib/frontend/img/awaitingimages.jpg': Permission denied
 ** [out :: xx.xxx.xxx.xxx] 
 ** [out :: xx.xxx.xxx.xxx] rm:
 ** [out :: xx.xxx.xxx.xxx] cannot remove `/var/www/vhosts/xyz.co.uk/releases/20130604203446/web/bundles/website/lib/frontend/img/ratingsprite.gif': Permission denied
 ** [out :: xx.xxx.xxx.xxx] 
    command finished in 561ms
failed: "sh -c 'if [ `readlink /var/www/vhosts/xyz.co.uk/current` != /var/www/vhosts/xyz.co.uk/releases/20130604203446 ]; then rm -rf /var/www/vhosts/xyz.co.uk/releases/20130604203446; fi'" on xx.xxx.xxx.xxx

我得到了很多这样的错误。我一直使用相同的部署用户。我想知道这是否与作曲家更新有关。这是我的作曲家。json文件:

{
    "name": "symfony/framework-standard-edition",
    "description": "The '"Symfony Standard Edition'" distribution",
    "autoload": {
        "psr-0": { "": "src/" }
    },
    "require": {
        "php": ">=5.3.3",
        "symfony/symfony": "2.2.*",
        "doctrine/orm": "~2.2,>=2.2.3",
        "doctrine/doctrine-bundle": "1.2.*",
        "twig/extensions": "1.0.*",
        "symfony/assetic-bundle": "2.1.*",
        "symfony/swiftmailer-bundle": "2.2.*",
        "symfony/monolog-bundle": "2.2.*",
        "sensio/distribution-bundle": "2.2.*",
        "sensio/framework-extra-bundle": "2.2.*",
        "sensio/generator-bundle": "2.2.*",
        "jms/security-extra-bundle": "1.4.*",
        "jms/di-extra-bundle": "1.3.*",
        "egeloen/ckeditor-bundle": "2.*",
        "knplabs/knp-menu-bundle": "1.1.*",
        "doctrine/doctrine-fixtures-bundle": "dev-master",
        "doctrine/data-fixtures": "dev-master",
        "egeloen/google-map-bundle": "*",
        "willdurand/geocoder": "*",
        "kriswallsmith/buzz": "*",
        "phpunit/phpunit": "3.7.*",
        "phpunit/php-invoker": "*",
        "doctrine/doctrine-migrations-bundle": "dev-master",
        "liuggio/rackspace-cloud-files-streamwrapper": ">=2.1",
        "liuggio/rackspace-cloud-files-bundle": ">=2.1",
        "avalanche123/imagine-bundle": "v2.1"
    },
    "scripts": {
        "post-install-cmd": [
            "Sensio''Bundle''DistributionBundle''Composer''ScriptHandler::buildBootstrap",
            "Sensio''Bundle''DistributionBundle''Composer''ScriptHandler::clearCache",
            "Sensio''Bundle''DistributionBundle''Composer''ScriptHandler::installAssets",
            "Sensio''Bundle''DistributionBundle''Composer''ScriptHandler::installRequirementsFile"
        ],
        "post-update-cmd": [
            "Sensio''Bundle''DistributionBundle''Composer''ScriptHandler::buildBootstrap",
            "Sensio''Bundle''DistributionBundle''Composer''ScriptHandler::clearCache",
            "Sensio''Bundle''DistributionBundle''Composer''ScriptHandler::installAssets",
            "Sensio''Bundle''DistributionBundle''Composer''ScriptHandler::installRequirementsFile"
        ]
    },
    "config": {
        "bin-dir": "bin",
        "bin-dir": "/usr/local/bin/"
    },
    "minimum-stability": "dev",
    "extra": {
        "symfony-app-dir": "app",
        "symfony-web-dir": "web",
        "symfony-assets-install": "symlink",
        "branch-alias": {
            "dev-master": "2.2-dev"
        }
    }
}

set :stage_dir, 'app/config/deploy' # needed for Symfony2 only
set :stages, %w(production staging development)
require 'capistrano/ext/multistage'
set :application,           "xyz.co.uk"
set :user,                  "deployer"  # The server's user for deploys
set :normalize_asset_timestamps, false
set :repository,            "git@github.xyz/xyz.co.uk.git"
set :scm,                   :git
set :keep_releases,         5
after "deploy:update",      "deploy:cleanup"
set :use_sudo,              true
set :web_path,              "web"
set :shared_files,          ["app/config/parameters.yml", "web/.htaccess"]
set :shared_children,       [app_path + "/logs", web_path + "/uploads", "vendor"]
set :use_composer,          true
set :update_vendors,        true
set :dump_assetic_assets,   true
set :deploy_via,            :remote_cache
set :writable_dirs,       ["app/cache", "app/logs", "web/uploads"]
set :webserver_user,      "www-data"
set :permission_method,   :acl
set :use_set_permissions, true

logger.level = Logger::MAX_LEVEL

我的生产。rb脚本:

server 'xx.xxx.xxx.xxx', :app, :web, :primary => true
ssh_options[:port] = xxxx
ssh_options[:forward_agent] = true
default_run_options[:pty] = true
set :deploy_to, "/var/www/vhosts/xyz.co.uk/"
set :symfony_env_prod, "prod"
set :branch, "master"
after 'deploy:finalize_update', 'symfony:project:clear_controllers'