bundle install导致“在此上下文中不允许映射值”错误
我有一个已经工作了一段时间的rails 4项目。 我试图安装taps但收到错误消息：
$ gem install taps /usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/psych.rb:370:in `parse': (): mapping values are not allowed in this context at line 2 column 29 (Psych::SyntaxError) from /usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/psych.rb:370:in `parse_stream' from /usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/psych.rb:318:in `parse' from /usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/psych.rb:245:in `load' from /usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/site_ruby/2.2.0/rubygems/config_file.rb:333:in `load_file' from /usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/site_ruby/2.2.0/rubygems/config_file.rb:198:in `initialize' from /usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/site_ruby/2.2.0/rubygems/gem_runner.rb:74:in `new' from /usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/site_ruby/2.2.0/rubygems/gem_runner.rb:74:in `do_configuration' from /usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/site_ruby/2.2.0/rubygems/gem_runner.rb:39:in `run' from /usr/local/rvm/rubies/ruby-2.2.1/bin/gem:21:in `'
尝试运行gem list或bundle update时，我收到相同的错误消息。 我搜索了类似的问题 ，似乎原因通常是格式不正确的YAML文件。 我的database.yml文件和Gemfile最近没有更新，所以我不知道什么时候引入了这个bug。
我在Github上发现了一个描述此错误的rails问题 ，有人建议使用irb解析YAML文件以隔离问题。 我试过解析database.yml和Gemfile ：
配置/ database.yml的
# SQLite version 3.x # gem install sqlite3 # # Ensure the SQLite 3 gem is defined in your Gemfile # gem 'sqlite3' # default: &default adapter: sqlite3 pool: 5 timeout: 5000 development: <<: *default database: db/development.sqlite3 # Warning: The database defined as "test" will be erased and # re-generated from your development database when you run "rake". # Do not set this db to the same as development or production. test: <<: *default database: db/test.sqlite3 production: <<: *default database: db/production.sqlite3
$ irb -ryaml 2.2.1 :001 > YAML.load_file 'config/database.yml' => {"default"=>{"adapter"=>"sqlite3", "pool"=>5, "timeout"=>5000}, "development"=>{"adapter"=>"sqlite3", "pool"=>5, "timeout"=>5000, "database"=>"db/development.sqlite3"}, "test"=>{"adapter"=>"sqlite3", "pool"=>5, "timeout"=>5000, "database"=>"db/test.sqlite3"}, "production"=>{"adapter"=>"sqlite3", "pool"=>5, "timeout"=>5000, "database"=>"db/production.sqlite3"}}
的Gemfile
source 'https://rubygems.org' gem 'rails', '4.2.2' gem 'faker', '1.4.2' gem 'will_paginate', '3.0.7' gem 'bootstrap-will_paginate', '0.0.10' gem 'bootstrap-sass', '3.2.0.0' gem 'sass-rails', '5.0.2' gem 'uglifier', '2.5.3' gem 'coffee-rails', '4.1.0' gem 'jquery-rails', '4.0.3' gem 'turbolinks', '2.3.0' gem 'jbuilder', '2.2.3' gem 'devise', '3.5.6' group :development, :test do gem 'sqlite3', '1.3.9' gem 'byebug', '3.4.0' gem 'web-console', '2.0.0.beta3' gem 'spring', '1.1.3' end group :test do gem 'minitest-reporters', '1.0.5' gem 'mini_backtrace', '0.1.3' gem 'guard-minitest', '2.3.1' end group :production do gem 'pg', '0.17.1' gem 'rails_12factor', '0.0.2' end
$ irb -ryaml 2.2.1 :001 > YAML.load_file 'Gemfile' => "source 'https://rubygems.org'\n\ngem 'rails', '4.2.2' gem 'faker', '1.4.2' gem 'will_paginate', '3.0.7' gem 'bootstrap-will_paginate', '0.0.10' gem 'bootstrap-sass', '3.2.0.0' gem 'sass-rails', '5.0.2' gem 'uglifier', '2.5.3' gem 'coffee-rails', '4.1.0' gem 'jquery-rails', '4.0.3' gem 'turbolinks', '2.3.0' gem 'jbuilder', '2.2.3' gem 'devise', '3.5.6'\ngroup :development, :test do gem 'sqlite3', '1.3.9' gem 'byebug', '3.4.0' gem 'web-console', '2.0.0.beta3' gem 'spring', '1.1.3' end\ngroup :test do gem 'minitest-reporters', '1.0.5' gem 'mini_backtrace', '0.1.3' gem 'guard-minitest', '2.3.1' end\ngroup :production do gem 'pg', '0.17.1' gem 'rails_12factor', '0.0.2' end"
两个文件都正确解析，所以我卡住了。 我不知道为什么命令会一直失败，因为错误消息不能识别有问题的文件。
我终于能够找到这个错误的来源。
RubyGems的/ config_file.rb：
SYSTEM_WIDE_CONFIG_FILE = File.join SYSTEM_CONFIG_PATH, 'gemrc' ... system_config = load_file SYSTEM_WIDE_CONFIG_FILE
我尝试解析我的.gemrc文件但失败了：
$ irb -ryaml 2.2.1 :001 > YAML.load_file '/home/ubuntu/.gemrc' Psych::SyntaxError: (/home/ubuntu/.gemrc): mapping values are not allowed in this context at line 2 column 29 from /usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/psych.rb:370:in `parse' from /usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/psych.rb:370:in `parse_stream' from /usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/psych.rb:318:in `parse' from /usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/psych.rb:245:in `load' from /usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/psych.rb:464:in `block in load_file' from /usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/psych.rb:464:in `open' from /usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/psych.rb:464:in `load_file' from (irb):1 from /usr/local/rvm/rubies/ruby-2.2.1/bin/irb:11:in `'
不知何故，我的〜/ .gemrc中加入了两行：
install: --no-rdoc --no-ri update: --no-rdoc --no-rigem: --no-rdoc --no-ri
将它们分开以解决问题：
install: --no-rdoc --no-ri update: --no-rdoc --no-ri gem: --no-rdoc --no-ri
由于我的.gemrc文件不在我的项目的版本控制之下，无论我检查哪个历史提交，我都看到了错误。