如何在 Ruby 中修复 'no implicit conversion of Symbol into Hash'

Question

我刚开始学习 Ruby，我尝试制作一个简单的脚本来通过 ssh 连接到服务器。这是我的 class:

中的代码片段

require 'rubygems' if RUBY_VERSION < '1.9.0'
require 'sensu-plugin/check/cli'
gem 'net-ssh', '= 1.1.4'
require 'net/ssh'

class SshServer < Sensu::Plugin::Check::CLI

  option :host,
         short: '-h HOST',
         description: 'Server to ssh into',
         required: true

  def run
    puts "SSHing #{config[:host]} ..."
    Net::SSH.start(config[:host]) do |ssh|
      puts ssh.exec!('hostname')
      puts "Logging out..."
    end
end

我尝试输出 config[:host] 的值并对服务器名称进行硬编码，还有 config.get。没有运气。我正在使用 Ruby 版本 2.0.0.

这是完整的错误信息。抱歉，无法将其放入代码块中，因为它触发了 'too much code' 警告：

检查失败运行：

no implicit conversion of Symbol into Hash, [
"/u/user/.gem/ruby/gems/needle-1.3.0/lib/needle/container.rb:141:in `merge'", 
"/u/user/.gem/ruby/gems/needle-1.3.0/lib/needle/container.rb:141:in `register'", 
"/u/user/.gem/ruby/gems/needle-1.3.0/lib/needle/definition-context.rb:123:in `method_missing'", 
"/u/user/.gem/ruby/gems/net-ssh-1.1.4/lib/net/ssh/transport/ossl/hmac/services.rb:30:in `block (2 levels) in register_services'", 
"/u/user/.gem/ruby/gems/net-ssh-1.1.4/lib/net/ssh/transport/ossl/hmac/services.rb:29:in `each'", 
"/u/user/.gem/ruby/gems/net-ssh-1.1.4/lib/net/ssh/transport/ossl/hmac/services.rb:29:in `block in register_services'", 
"/u/user/.gem/ruby/gems/needle-1.3.0/lib/needle/container.rb:107:in `define'", 
"/u/user/.gem/ruby/gems/needle-1.3.0/lib/needle/container.rb:250:in `block in namespace_define'", 
"/u/user/.gem/ruby/gems/needle-1.3.0/lib/needle/container.rb:177:in `call'", 
"/u/user/.gem/ruby/gems/needle-1.3.0/lib/needle/container.rb:177:in `block in namespace'", 
"/u/user/.gem/ruby/gems/needle-1.3.0/lib/needle/lifecycle/singleton.rb:42:in `call'", 
"/u/user/.gem/ruby/gems/needle-1.3.0/lib/needle/lifecycle/singleton.rb:42:in `block in call'", 
"/u/user/.gem/ruby/gems/needle-1.3.0/lib/needle/lifecycle/singleton.rb:40:in `synchronize'", 
"/u/user/.gem/ruby/gems/needle-1.3.0/lib/needle/lifecycle/singleton.rb:40:in `call'", 
"/u/user/.gem/ruby/gems/needle-1.3.0/lib/needle/service-point.rb:122:in `instance'", 
"/u/user/.gem/ruby/gems/needle-1.3.0/lib/needle/container.rb:308:in `get'", 
"/u/user/.gem/ruby/gems/needle-1.3.0/lib/needle/container.rb:251:in `namespace_define'", 
"/u/user/.gem/ruby/gems/net-ssh-1.1.4/lib/net/ssh/transport/ossl/hmac/services.rb:26:in `register_services'", 
"/u/user/.gem/ruby/gems/needle-1.3.0/lib/needle/container.rb:365:in `require'", 
"/u/user/.gem/ruby/gems/needle-1.3.0/lib/needle/definition-context.rb:77:in `require'", 
"/u/user/.gem/ruby/gems/net-ssh-1.1.4/lib/net/ssh/transport/ossl/services.rb:34:in `block in register_services'", 
"/u/user/.gem/ruby/gems/needle-1.3.0/lib/needle/container.rb:107:in `define'", 
"/u/user/.gem/ruby/gems/needle-1.3.0/lib/needle/container.rb:250:in `block in namespace_define'", 
"/u/user/.gem/ruby/gems/needle-1.3.0/lib/needle/container.rb:177:in `call'", 
"/u/user/.gem/ruby/gems/needle-1.3.0/lib/needle/container.rb:177:in `block in namespace'", 
"/u/user/.gem/ruby/gems/needle-1.3.0/lib/needle/lifecycle/singleton.rb:42:in `call'", 
"/u/user/.gem/ruby/gems/needle-1.3.0/lib/needle/lifecycle/singleton.rb:42:in `block in call'", 
"/u/user/.gem/ruby/gems/needle-1.3.0/lib/needle/lifecycle/singleton.rb:40:in `synchronize'", 
"/u/user/.gem/ruby/gems/needle-1.3.0/lib/needle/lifecycle/singleton.rb:40:in `call'", 
"/u/user/.gem/ruby/gems/needle-1.3.0/lib/needle/service-point.rb:122:in `instance'", 
"/u/user/.gem/ruby/gems/needle-1.3.0/lib/needle/container.rb:308:in `get'", 
"/u/user/.gem/ruby/gems/needle-1.3.0/lib/needle/container.rb:251:in `namespace_define'", 
"/u/user/.gem/ruby/gems/net-ssh-1.1.4/lib/net/ssh/transport/ossl/services.rb:30:in `register_services'", 
"/u/user/.gem/ruby/gems/needle-1.3.0/lib/needle/container.rb:365:in `require'", 
"/u/user/.gem/ruby/gems/needle-1.3.0/lib/needle/definition-context.rb:77:in `require'", 
"/u/user/.gem/ruby/gems/net-ssh-1.1.4/lib/net/ssh/transport/services.rb:137:in `block in register_services'", 
"/u/user/.gem/ruby/gems/needle-1.3.0/lib/needle/container.rb:107:in `define'", 
"/u/user/.gem/ruby/gems/needle-1.3.0/lib/needle/container.rb:250:in `block in namespace_define'", 
"/u/user/.gem/ruby/gems/needle-1.3.0/lib/needle/container.rb:177:in `call'", 
"/u/user/.gem/ruby/gems/needle-1.3.0/lib/needle/container.rb:177:in `block in namespace'", 
"/u/user/.gem/ruby/gems/needle-1.3.0/lib/needle/lifecycle/singleton.rb:42:in `call'", 
"/u/user/.gem/ruby/gems/needle-1.3.0/lib/needle/lifecycle/singleton.rb:42:in `block in call'", 
"/u/user/.gem/ruby/gems/needle-1.3.0/lib/needle/lifecycle/singleton.rb:40:in `synchronize'", 
"/u/user/.gem/ruby/gems/needle-1.3.0/lib/needle/lifecycle/singleton.rb:40:in `call'", 
"/u/user/.gem/ruby/gems/needle-1.3.0/lib/needle/service-point.rb:122:in `instance'", 
"/u/user/.gem/ruby/gems/needle-1.3.0/lib/needle/container.rb:308:in `get'", 
"/u/user/.gem/ruby/gems/needle-1.3.0/lib/needle/container.rb:251:in `namespace_define'", 
"/u/user/.gem/ruby/gems/net-ssh-1.1.4/lib/net/ssh/transport/services.rb:23:in `register_services'", 
"/u/user/.gem/ruby/gems/needle-1.3.0/lib/needle/container.rb:365:in `require'", 
"/u/user/.gem/ruby/gems/needle-1.3.0/lib/needle/definition-context.rb:77:in `require'", 
"/u/user/.gem/ruby/gems/net-ssh-1.1.4/lib/net/ssh/session.rb:126:in `block in initialize'", 
"/u/user/.gem/ruby/gems/needle-1.3.0/lib/needle/container.rb:107:in `define'", 
"/u/user/.gem/ruby/gems/net-ssh-1.1.4/lib/net/ssh/session.rb:106:in `initialize'", 
"/u/user/.gem/ruby/gems/net-ssh-1.1.4/lib/net/ssh.rb:47:in `new'", 
"/u/user/.gem/ruby/gems/net-ssh-1.1.4/lib/net/ssh.rb:47:in `start'", "check-directory-exists.rb:59:in `run'", 
"/u/user/.gem/ruby/gems/sensu-plugin-1.4.7/lib/sensu-plugin/cli.rb:58:in `block in <class:CLI>'"
]

Answer 1

已更新

我找到了与您的 ruby 版本兼容的版本。我用 ruby 版本

测试了这个

ruby 2.0.0p648 (2015-12-16 revision 53162) [x86_64-darwin18.2.0]

该版本后跟：

gem install net-ssh --version 3.0.2

我能够让我的代码在没有你的错误的情况下工作。

原回答

问题似乎出在旧版本 net-ssh 上没有错误。我也用过这种格式：

def run
  puts "SSHing #{config[:host]} ..."
  Net::SSH.start( config[:host],
                  :password=> 'password',
                  :port=> 22,
                  :username=> 'username') do |ssh|

    puts ssh.exec!('hostname')
    puts "Logging out..."
  end
end

如何在 Ruby 中修复 'no implicit conversion of Symbol into Hash'

How to fix 'no implicit conversion of Symbol into Hash' in Ruby

ruby

rubygems

已更新

原回答