为什么我在部署 capistrano 时会出现语法错误？

Question

我是 capistrano 和 ruby​​ 的新手，当我使用 cap deploy 时，我遇到了一些错误。我尝试升级我的 ruby​​ 版本和io-console，但它们都没有帮助我解决我的问题。有人可以帮我解决吗？

在我的错误日志下方：

/usr/share/ruby/vendor_ruby/2.0/rubygems/core_ext/kernel_require.rb:55:in `require': /usr/local/share/ruby/gems/2.0/gems/i18n-1.6.0/lib/i18n/exceptions.rb:20: syntax error, unexpected <<, expecting ')' (SyntaxError)
      super(<<~MESSAGE)
              ^
/usr/local/share/ruby/gems/2.0/gems/i18n-1.6.0/lib/i18n/exceptions.rb:23: syntax error, unexpected keyword_in, expecting keyword_end
...hod is meant to display text in the user locale, so calling ...
...                               ^
/usr/local/share/ruby/gems/2.0/gems/i18n-1.6.0/lib/i18n/exceptions.rb:23: syntax error, unexpected tIDENTIFIER, expecting keyword_do or '{' or '('
... in the user locale, so calling it before the user locale has
...                               ^
/usr/local/share/ruby/gems/2.0/gems/i18n-1.6.0/lib/i18n/exceptions.rb:26: syntax error, unexpected tIDENTIFIER, expecting keyword_do or '{' or '('
...tside of the user flow, you can do so by passing
...                               ^
/usr/local/share/ruby/gems/2.0/gems/i18n-1.6.0/lib/i18n/exceptions.rb:27: syntax error, unexpected tIDENTIFIER, expecting keyword_end
...ctly with the `locale` argument, e.g. `I18n.#{method}(..., l...
...                               ^
/usr/local/share/ruby/gems/2.0/gems/i18n-1.6.0/lib/i18n/exceptions.rb:27: syntax error, unexpected tCONSTANT, expecting :: or '[' or '.'
...e `locale` argument, e.g. `I18n.#{method}(..., locale: :en)`
...                               ^
        from /usr/share/ruby/vendor_ruby/2.0/rubygems/core_ext/kernel_require.rb:55:in `require'
        from /usr/local/share/ruby/gems/2.0/gems/i18n-1.6.0/lib/i18n.rb:6:in `<top (required)>'
        from /usr/share/ruby/vendor_ruby/2.0/rubygems/core_ext/kernel_require.rb:55:in `require'
        from /usr/share/ruby/vendor_ruby/2.0/rubygems/core_ext/kernel_require.rb:55:in `require'
        from /usr/local/share/ruby/gems/2.0/gems/capistrano-3.11.0/lib/capistrano/i18n.rb:1:in `<top (required)>'
        from /usr/share/ruby/vendor_ruby/2.0/rubygems/core_ext/kernel_require.rb:55:in `require'
        from /usr/share/ruby/vendor_ruby/2.0/rubygems/core_ext/kernel_require.rb:55:in `require'
        from /usr/local/share/ruby/gems/2.0/gems/capistrano-3.11.0/lib/capistrano/all.rb:10:in `<top (required)>'
        from /usr/share/ruby/vendor_ruby/2.0/rubygems/core_ext/kernel_require.rb:55:in `require'
        from /usr/share/ruby/vendor_ruby/2.0/rubygems/core_ext/kernel_require.rb:55:in `require'
        from /usr/local/share/ruby/gems/2.0/gems/capistrano-3.11.0/bin/cap:2:in `<top (required)>'
        from /usr/local/bin/cap:23:in `load'
        from /usr/local/bin/cap:23:in `<main>'```

Answer 1

错误消息的路径看起来像您使用的是 Ruby 2.0 和 i18n gem 的版本 1.6.0。 i18n gem 在该版本中使用波浪形的heredoc 语法（<<~）。该语法是在 Ruby 2.3 中引入的。

这意味着您有两个选择：

• 将您的 Ruby 版本更新到至少 2.3 或
• 降级i18n。 1.5.1 似乎是不依赖 Ruby 2.3 的最新版本