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我无法为启用 Rails 3.2.15 资产管道的应用程序预编译资产。

宝石文件：

# Asset pipeline
group :assets do
  gem 'sass-rails',   '3.2.5'
  gem 'coffee-rails', '3.2.2'
  gem 'uglifier',     '1.3.0'
end

生产.rb

  # Disable Rails's static asset server (Apache or nginx will already do this)
  config.serve_static_assets = false

  # Compress JavaScripts and CSS
  config.assets.compress = true

  # Don't fallback to assets pipeline if a precompiled asset is missed
  config.assets.compile = false

  # Generate digests for assets URLs
  config.assets.digest = true

  # Precompile additional assets (application.js, application.css, and all non-JS/CSS are already added)
  config.assets.precompile += %w( *.js *.css )

  # Choose which compressors to use
  # config.assets.js_compressor  = :uglifier
  # config.assets.css_compressor = :scss

这些是我运行的命令：

bundle exec rake assets:clean RAILS_ENV=production --trace
bundle exec rake assets:precompile RAILS_ENV=production --trace

我收到以下错误：

** Invoke assets:precompile (first_time)
** Execute assets:precompile
/usr/bin/ruby1.9.1 /usr/local/bin/rake assets:precompile:all RAILS_ENV=production RAILS_GROUPS=assets --trace
** Invoke assets:precompile:all (first_time)
** Execute assets:precompile:all
** Invoke assets:precompile:primary (first_time)
** Invoke assets:environment (first_time)
** Execute assets:environment
** Invoke environment (first_time)
** Execute environment
** Invoke tmp:cache:clear (first_time)
** Execute tmp:cache:clear
** Execute assets:precompile:primary
rake aborted!
File exists - (/media/shared/code/me/app/tmp/cache/assets/sprockets%2F19d4dbfec65d2b21144310264f4d8c7320131106-63076-sh3p6h, /media/shared/code/me/app/tmp/cache/assets/D04/B00/sprockets%2F19d4dbfec65d2b21144310264f4d8c73)
/usr/lib/ruby/1.9.1/fileutils.rb:519:in `rename'
/usr/lib/ruby/1.9.1/fileutils.rb:519:in `block in mv'
/usr/lib/ruby/1.9.1/fileutils.rb:1515:in `block in fu_each_src_dest'
/usr/lib/ruby/1.9.1/fileutils.rb:1531:in `fu_each_src_dest0'
/usr/lib/ruby/1.9.1/fileutils.rb:1513:in `fu_each_src_dest'
/usr/lib/ruby/1.9.1/fileutils.rb:508:in `mv'
/usr/lib/ruby/gems/1.9.1/gems/activesupport-3.2.15/lib/active_support/core_ext/file/atomic.rb:36:in `atomic_write'

只有后一个文件（每次我运行命令时似乎都会改变）在磁盘上可见，前者似乎是一个临时文件，它被创建然后移动。看到错误后不可见。

任何想法这到底意味着什么？

我正在运行 Ubuntu 12.04.3 LTS、Rubygems 2.1.6、Bundler 1.3.5 和 Ruby 1.9.3p429

谢谢

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