Ruby RubyGems

RubyGems is a package manager for Ruby, providing a standard format for distributing Ruby programs and libraries, as well as a tool for managing package installations.

RubyGems is a tool designed to easily manage gem installations and servers used for distributing gems, similar to apt under Ubuntu.-get, Centos's yum, Python's pip.

RubyGems was approximately created in2003year11month, from Ruby 1.9version it became part of the Ruby standard library.

If your Ruby is below 1.9 version, or you can install manually:

• Firstly, download the installation package:https://rubygems.org/pages/download。

• Unzip and enter the directory, then execute the command:ruby setup.rb

Update RubyGems commands:

$ gem update　--system # Requires administrator or root user

Gem

Gems are the package manager for Ruby modules (called Gems). It contains package information and files used for installation.

Gems are usually built according to the '.gemspec' file, which is a YAML file containing information about Gems. Ruby code can also be used to directly build Gems, in which case Rake is usually used.

gem commands

The gem command is used to build, upload, download, and install Gem packages.

gem usage

RubyGems is functionally similar to apt-get, portage, yum, and npm are very similar.

Install:

gem install mygem

Uninstall:

gem uninstall mygem

List installed gems:

gem list　--local

List available gems, for example:

gem list　--remote

Create RDoc documents for all gems:

gem rdoc　--all

Download a gem without installing:

gem fetch mygem

Search from available gems, for example:

gem search STRING　--remote

Building gem packages

The gem command is also used to build and maintain .gemspec and .gem files.

Use the .gemspec file to build .gem:

gem build mygem.gemspec

Modify the domestic source

Due to domestic network reasons (you know), rubygems.org is stored on Amazon S3 The resource files above may fail to connect intermittently.

So you may encounter gem install rack or bundle install without any response for half a day, you can use gem install rails specifically. -V to view the execution process.

Therefore, we can modify it to a domestic download source: 　https://gems.ruby-china.com

Firstly, check the current source:

$　gem　sources　-l
***　CURRENT　SOURCES　***
https://rubygems.org/

接着，移除 https://rubygems.org/，并添加国内下载源 https://gems.ruby-china.com/。

$　gem　sources　--remove　https://rubygems.org/
$　gem　sources　-a　https://gems.ruby-china.com/
$　gem　sources　-l
***　CURRENT　SOURCES　***
https://gems.ruby-china.com/
#　请确保只有　gems.ruby-china.com
$　gem　install　rails

如果你使用 Gemfile 和 Bundle (例如：Rails 项目)

你可以用bundle的gem源代码镜像命令。

$　bundle　config　mirror.https://rubygems.org　https://gems.ruby-china.com/

这样你不用改你的 Gemfile 的 source。

source　'https://rubygems.org/'
gem　'rails',　'4.1.0'
...