启动sinatra服务器的gem可执行文件不工作

Question

所以我用sinatra:写了一个简单的"Hello World"网站

#!/usr/bin/env ruby
# sinatra_demo/bin/sinatra_demo
require 'rubygems'
require 'sinatra'
get "/hello" do
  "Hello World!"
end

当我运行它时，它会工作，我可以将浏览器发送到http://localhost:4567/hello并获得"Hello World"：

% sinatra_demo/bin/sinatra_demo
== Sinatra/1.2.6 has taken the stage on 4567 for development with backup from WEBrick
[2011-06-30 09:29:58] INFO  WEBrick 1.3.1
[2011-06-30 09:29:58] INFO  ruby 1.9.2 (2011-02-18) [x86_64-darwin10.7.4]
[2011-06-30 09:29:58] INFO  WEBrick::HTTPServer#start: pid=73620 port=4567
127.0.0.1 - - [30/Jun/2011 09:30:10] "GET /hello HTTP/1.1" 200 12 0.0027
localhost - - [30/Jun/2011:09:30:10 EDT] "GET /hello HTTP/1.1" 200 12
- -> /hello
127.0.0.1 - - [30/Jun/2011 09:30:10] "GET /favicon.ico HTTP/1.1" 404 447 0.0004
localhost - - [30/Jun/2011:09:30:10 EDT] "GET /favicon.ico HTTP/1.1" 404 447
- -> /favicon.ico
127.0.0.1 - - [30/Jun/2011 09:30:10] "GET /favicon.ico HTTP/1.1" 404 447 0.0003
localhost - - [30/Jun/2011:09:30:10 EDT] "GET /favicon.ico HTTP/1.1" 404 447
- -> /favicon.ico
^C
== Sinatra has ended his set (crowd applauds)
[2011-06-30 09:30:12] INFO  going to shutdown ...
[2011-06-30 09:30:12] INFO  WEBrick::HTTPServer#start done.

然而，当我试图将其包装成宝石时：

#!/usr/bin/env gem build
# sinatra_demo/sinatra_demo.gemspec
require 'rubygems'
Gem::Specification.new do |spec|
  spec.name = 'sinatra_demo'
  spec.summary = "A hello world webserver"
  spec.author = "rampion"
  spec.files = Dir['bin/*']
  spec.executables = ['sinatra_demo']
  spec.version = "1.0.0"
  spec.add_dependency('sinatra')
  spec.has_rdoc = false
end

我可以安装宝石罚款：

% sinatra_demo/sinatra_demo.gemspec
WARNING:  no description specified
WARNING:  no email specified
WARNING:  no homepage specified
  Successfully built RubyGem
  Name: sinatra_demo
  Version: 1.0.0
  File: sinatra_demo-1.0.0.gem
% gem install sinatra_demo-1.0.0.gem
Successfully installed sinatra_demo-1.0.0
1 gem installed
Installing ri documentation for sinatra_demo-1.0.0...
Installing RDoc documentation for sinatra_demo-1.0.0...

但是运行已安装的可执行文件无法启动Web服务器

% which sinatra_demo
~/.rvm/gems/ruby-1.9.2-p180/bin/sinatra_demo
% sinatra_demo
%

gem的可执行文件正在运行(通过puts语句可以看出(，但Web服务器没有启动。

我做错了什么？(如果你想玩的话，文件的要点(

Answer 1

您需要添加

enable :run

到您的应用程序文件，以便启动内置的web服务器。

从Sinatra配置设置：

默认情况下，仅当：app_file与$0匹配时才启用此设置。即，当使用ruby myapp.rb直接运行Sinatra应用程序文件时。

当直接运行文件时，此条件成立，因此web服务器启动。然而，当打包为gem时，实际运行的可执行文件实际上是由rubygems创建的应用程序文件周围的包装脚本，因此条件为false，web服务器不会启动。

Answer 2

为了防止其他人出现在这里，也有可能app.rb不在您认为的文件夹中。