为什么`中间人服务’工作，但是’中间人构建’无法编译这个Sass？
当我只运行all.css来服务时， all.css被编译得很好，只包含对+box-shadow(none)的调用：
/* line 1, /home/yang/asdf/source/stylesheets/content.css.sass */ div { -webkit-box-shadow: none; -moz-box-shadow: none; box-shadow: none; }
但是当我构建网站时，我得到了这个Sass / Compass错误：
$ middleman build Slim::EmbeddedEngine is deprecated, it is called Slim::Embedded in Slim 2.0 Slim::EmbeddedEngine is deprecated, it is called Slim::Embedded in Slim 2.0 Slim::EmbeddedEngine is deprecated, it is called Slim::Embedded in Slim 2.0 /home/yang/asdf/source/stylesheets/content.css.sass:2:in `box-shadow': Undefined mixin 'box-shadow'. (Sass::SyntaxError) (in /home/yang/asdf/source/stylesheets/content.css.sass:2) from /home/yang/asdf/source/stylesheets/content.css.sass:2 from /var/lib/gems/1.9.1/gems/sass-3.2.7/lib/sass/tree/visitors/perform.rb:253:in `visit_mixin' from /var/lib/gems/1.9.1/gems/sass-3.2.7/lib/sass/tree/visitors/base.rb:37:in `visit' from /var/lib/gems/1.9.1/gems/sass-3.2.7/lib/sass/tree/visitors/perform.rb:100:in `visit' from /var/lib/gems/1.9.1/gems/sass-3.2.7/lib/sass/tree/visitors/base.rb:53:in `block in visit_children' from /var/lib/gems/1.9.1/gems/sass-3.2.7/lib/sass/tree/visitors/base.rb:53:in `map' from /var/lib/gems/1.9.1/gems/sass-3.2.7/lib/sass/tree/visitors/base.rb:53:in `visit_children' from /var/lib/gems/1.9.1/gems/sass-3.2.7/lib/sass/tree/visitors/perform.rb:109:in `block in visit_children' from /var/lib/gems/1.9.1/gems/sass-3.2.7/lib/sass/tree/visitors/perform.rb:121:in `with_environment' from /var/lib/gems/1.9.1/gems/sass-3.2.7/lib/sass/tree/visitors/perform.rb:108:in `visit_children' from /var/lib/gems/1.9.1/gems/sass-3.2.7/lib/sass/tree/visitors/base.rb:37:in `block in visit' from /var/lib/gems/1.9.1/gems/sass-3.2.7/lib/sass/tree/visitors/perform.rb:320:in `visit_rule' from /var/lib/gems/1.9.1/gems/sass-3.2.7/lib/sass/tree/visitors/base.rb:37:in `visit' from /var/lib/gems/1.9.1/gems/sass-3.2.7/lib/sass/tree/visitors/perform.rb:100:in `visit' from /var/lib/gems/1.9.1/gems/sass-3.2.7/lib/sass/tree/visitors/base.rb:53:in `block in visit_children' from /var/lib/gems/1.9.1/gems/sass-3.2.7/lib/sass/tree/visitors/base.rb:53:in `map' from /var/lib/gems/1.9.1/gems/sass-3.2.7/lib/sass/tree/visitors/base.rb:53:in `visit_children' from /var/lib/gems/1.9.1/gems/sass-3.2.7/lib/sass/tree/visitors/perform.rb:109:in `block in visit_children' from /var/lib/gems/1.9.1/gems/sass-3.2.7/lib/sass/tree/visitors/perform.rb:121:in `with_environment' from /var/lib/gems/1.9.1/gems/sass-3.2.7/lib/sass/tree/visitors/perform.rb:108:in `visit_children' from /var/lib/gems/1.9.1/gems/sass-3.2.7/lib/sass/tree/visitors/base.rb:37:in `block in visit' from /var/lib/gems/1.9.1/gems/sass-3.2.7/lib/sass/tree/visitors/perform.rb:128:in `visit_root' from /var/lib/gems/1.9.1/gems/sass-3.2.7/lib/sass/tree/visitors/base.rb:37:in `visit' from /var/lib/gems/1.9.1/gems/sass-3.2.7/lib/sass/tree/visitors/perform.rb:100:in `visit' from /var/lib/gems/1.9.1/gems/sass-3.2.7/lib/sass/tree/visitors/perform.rb:7:in `visit' from /var/lib/gems/1.9.1/gems/sass-3.2.7/lib/sass/tree/root_node.rb:20:in `render' from /var/lib/gems/1.9.1/gems/sass-3.2.7/lib/sass/engine.rb:315:in `_render' from /var/lib/gems/1.9.1/gems/sass-3.2.7/lib/sass/engine.rb:262:in `render' from /var/lib/gems/1.9.1/gems/sprockets-sass-0.9.1/lib/sprockets/sass/sass_template.rb:40:in `evaluate' from /var/lib/gems/1.9.1/gems/tilt-1.3.7/lib/tilt/template.rb:77:in `render' from /var/lib/gems/1.9.1/gems/sprockets-2.9.2/lib/sprockets/context.rb:197:in `block in evaluate' from /var/lib/gems/1.9.1/gems/sprockets-2.9.2/lib/sprockets/context.rb:194:in `each' from /var/lib/gems/1.9.1/gems/sprockets-2.9.2/lib/sprockets/context.rb:194:in `evaluate' from /var/lib/gems/1.9.1/gems/sprockets-2.9.2/lib/sprockets/processed_asset.rb:12:in `initialize' from /var/lib/gems/1.9.1/gems/sprockets-2.9.2/lib/sprockets/base.rb:374:in `new' from /var/lib/gems/1.9.1/gems/sprockets-2.9.2/lib/sprockets/base.rb:374:in `block in build_asset' from /var/lib/gems/1.9.1/gems/sprockets-2.9.2/lib/sprockets/base.rb:395: from /var/lib/gems/1.9.1/gems/sprockets-2.9.2/lib/sprockets/base.rb:373:in `build_asset' from /var/lib/gems/1.9.1/gems/sprockets-2.9.2/lib/sprockets/index.rb:94:in `block in build_asset' from /var/lib/gems/1.9.1/gems/sprockets-2.9.2/lib/sprockets/caching.rb:51:in `cache_asset' from /var/lib/gems/1.9.1/gems/sprockets-2.9.2/lib/sprockets/index.rb:93:in `build_asset' from /var/lib/gems/1.9.1/gems/sprockets-2.9.2/lib/sprockets/base.rb:287:in `find_asset' from /var/lib/gems/1.9.1/gems/sprockets-2.9.2/lib/sprockets/index.rb:61:in `find_asset' from /var/lib/gems/1.9.1/gems/sprockets-2.9.2/lib/sprockets/bundled_asset.rb:16:in `initialize' from /var/lib/gems/1.9.1/gems/sprockets-2.9.2/lib/sprockets/base.rb:377:in `new' from /var/lib/gems/1.9.1/gems/sprockets-2.9.2/lib/sprockets/base.rb:377:in `build_asset' from /var/lib/gems/1.9.1/gems/sprockets-2.9.2/lib/sprockets/index.rb:94:in `block in build_asset' from /var/lib/gems/1.9.1/gems/sprockets-2.9.2/lib/sprockets/caching.rb:51:in `cache_asset' from /var/lib/gems/1.9.1/gems/sprockets-2.9.2/lib/sprockets/index.rb:93:in `build_asset' from /var/lib/gems/1.9.1/gems/sprockets-2.9.2/lib/sprockets/base.rb:287:in `find_asset' from /var/lib/gems/1.9.1/gems/sprockets-2.9.2/lib/sprockets/index.rb:61:in `find_asset' from /var/lib/gems/1.9.1/gems/sprockets-2.9.2/lib/sprockets/environment.rb:75:in `find_asset' from /var/lib/gems/1.9.1/gems/sprockets-2.9.2/lib/sprockets/server.rb:47:in `call' from /var/lib/gems/1.9.1/gems/middleman-sprockets-3.0.11/lib/middleman-sprockets/extension.rb:200:in `call' from /var/lib/gems/1.9.1/gems/rack-1.4.5/lib/rack/builder.rb:134:in `call' from /var/lib/gems/1.9.1/gems/rack-1.4.5/lib/rack/urlmap.rb:64:in `block in call' from /var/lib/gems/1.9.1/gems/rack-1.4.5/lib/rack/urlmap.rb:49:in `each' from /var/lib/gems/1.9.1/gems/rack-1.4.5/lib/rack/urlmap.rb:49:in `call' from /var/lib/gems/1.9.1/gems/middleman-more-3.0.13/lib/middleman-more/extensions/minify_javascript.rb:51:in `call' from /var/lib/gems/1.9.1/gems/middleman-more-3.0.13/lib/middleman-more/extensions/minify_css.rb:50:in `call' from /var/lib/gems/1.9.1/gems/rack-1.4.5/lib/rack/builder.rb:134:in `call' from /var/lib/gems/1.9.1/gems/rack-test-0.6.2/lib/rack/mock_session.rb:30:in `request' from /var/lib/gems/1.9.1/gems/rack-test-0.6.2/lib/rack/test.rb:230:in `process_request' from /var/lib/gems/1.9.1/gems/rack-test-0.6.2/lib/rack/test.rb:57:in `get' from /var/lib/gems/1.9.1/gems/middleman-core-3.0.13/lib/middleman-core/cli/build.rb:259:in `block in execute!' from /var/lib/gems/1.9.1/gems/middleman-core-3.0.13/lib/middleman-core/cli/build.rb:256:in `each' from /var/lib/gems/1.9.1/gems/middleman-core-3.0.13/lib/middleman-core/cli/build.rb:256:in `execute!' from /var/lib/gems/1.9.1/gems/middleman-core-3.0.13/lib/middleman-core/cli/build.rb:198:in `invoke!' from /var/lib/gems/1.9.1/gems/thor-0.15.4/lib/thor/actions.rb:95:in `action' from /var/lib/gems/1.9.1/gems/middleman-core-3.0.13/lib/middleman-core/cli/build.rb:65:in `build' from /var/lib/gems/1.9.1/gems/thor-0.15.4/lib/thor/task.rb:27:in `run' from /var/lib/gems/1.9.1/gems/thor-0.15.4/lib/thor/invocation.rb:120:in `invoke_task' from /var/lib/gems/1.9.1/gems/thor-0.15.4/lib/thor.rb:275:in `dispatch' from /var/lib/gems/1.9.1/gems/thor-0.15.4/lib/thor/base.rb:425:in `start' from /var/lib/gems/1.9.1/gems/middleman-core-3.0.13/lib/middleman-core/cli.rb:77:in `method_missing' from /var/lib/gems/1.9.1/gems/thor-0.15.4/lib/thor/task.rb:29:in `run' from /var/lib/gems/1.9.1/gems/thor-0.15.4/lib/thor/task.rb:126:in `run' from /var/lib/gems/1.9.1/gems/thor-0.15.4/lib/thor/invocation.rb:120:in `invoke_task' from /var/lib/gems/1.9.1/gems/thor-0.15.4/lib/thor.rb:275:in `dispatch' from /var/lib/gems/1.9.1/gems/thor-0.15.4/lib/thor/base.rb:425:in `start' from /var/lib/gems/1.9.1/gems/middleman-core-3.0.13/lib/middleman-core/cli.rb:22:in `start' from /var/lib/gems/1.9.1/gems/middleman-core-3.0.13/bin/middleman:18:in `' from /usr/local/bin/middleman:19:in `load' from /usr/local/bin/middleman:19:in `'
我在下面的一个简单的例子中重现了这一点，如果你想在本地重新编写，我还在底部包含了base64编码的tar.gz。 它还包括完整的回溯。
这是文件树：
asdf ├── config.rb ├── config.ru ├── error ├── Gemfile ├── Gemfile.lock ├── source │ └── stylesheets │ ├── all.css.sass │ └── content.css.sass
以下是所有文件内容：
config.rb：
require 'animate-sass' require 'susy' require 'slim' set :css_dir, 'stylesheets' set :js_dir, 'javascripts' set :images_dir, 'images' set :fonts_dir, 'fonts' configure :build do activate :minify_css activate :minify_javascript activate :relative_assets require "middleman-smusher" activate :smusher
config.ru：
require 'rubygems' require 'middleman/rack' run Middleman.server
的Gemfile：
source :rubygems gem "slim" gem "susy" gem "animate-sass" gem "middleman", "~>3.0.13" gem "middleman-smusher"
Gemfile.lock：见tar.gz
all.css.sass：
@import compass/css3/box-shadow @import content
content.css.sass：
div +box-shadow(none)
这是base64-encodede tar.gz，您可以使用base64 -d解码：
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在此先感谢您的帮助！
原来这是由于某些文件无意输出，其名称不以下划线开头。 例如， content.css.sass应该是_content.css.sass ，以便middleman知道不要尝试直接构建该文件。 （我们并不熟悉middleman等等 – 这是一个交给我们的捆绑包，因此需要一段时间来追踪它。）
所以我碰到了这个并希望给出一个更精确的答案：
非下划线命名文件下游链中的任何@import ed文件都会出现错误，例如Sass::SyntaxError Undefined Variable或Undefined mixin 。
它就像确保链中的每个文件都以下划线开头一样简单; 有时很容易路过！