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Distributing a Gem
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Distributing a gem is easy. You can upload it to a web site or transfer it in any way you would normally transfer a file. You can then install the gem with gem install by referring to the local file. However, distributing a gem in a fashion where the gem client can download it automatically is a little harder. The RubyGems system comes with a script called gem_server that runs a special server on your local machine (or any machine you choose to run it on) that can serve gems. To install a gem from a specific server, you can use the --source option: gem install gem_name --source http://server-name-here/
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Note In a similar fashion, you can also use a normal web server or web hosting package to host your
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gems, and you can install them using --source. To do this, you have to create a folder on your web site called /gems and use RubyGems generate_yaml_index.rb script to generate the metafiles required to make it work.
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The best way to distribute gems, however, is in a form where they can be installed over the Internet without specifying a source. For example: gem install gem_name This command installs the gem gem_name by looking for it on the Internet and downloading it to the local machine. But how does gem know where to download gems from By default, RubyGems searches a Ruby project repository called RubyForge for gems if no source is specified. We ll look at how to make gems available in the default database using RubyForge next.
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RubyForge
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RubyForge (http://rubyforge.org/) is the largest community repository for Ruby projects and libraries, and is maintained by Tom Copeland. It contains thousands of projects and acts as a centralized location for the hosting of Ruby projects. Nearly all the major Ruby libraries are available from or hosted there, including Ruby on Rails. As well as basic hosting, RubyForge lets project maintainers create simple web sites hosted under subdomains of RubyForge (as can be seen at http://webgen.rubyforge.org/), and it provides source management services (CVS, Git, and SVN) for those who require them. Importantly, however, RubyForge acts as the default source for gems. When a user runs gem install rails or gem install mongrel, gem looks for the gem files at RubyForge.
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C ha p te r 10 D e p LO Y I N G r U B Y a p p LI C a t I O N S a N D LI B r a r I e S
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Therefore, if you want your gem to be installed easily by users, hosting it at RubyForge is key. Hosting with RubyForge is also free, and with RubyForge s status in the community, hosting your project at RubyForge makes it look more legitimate. To host a project with RubyForge, create a new account using the link from the front page at http://rubyforge.org/, and once you re set up, you can apply to create a new project. You have to enter several pieces of information about your project, but within a couple of days you should be approved and will be able to upload files. Gems associated with any project hosted in RubyForge become available to install with RubyGems within a few hours.
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GitHub
In 2007 and early 2008, the Git source control system swept to popularity in the Ruby world, supplanting the previously incumbent Subversion/SVN. One of Git s benefits over SVN is that it s completely decentralized, but people still wanted a central source on which to host shared projects publicly, as a sort of hub, and so GitHub (http://www.github.com/) went live in February 2008. Source control systems are beyond the scope of this book, but if you get into releasing code for use in the Ruby community, you are going to come across GitHub before long. At the time of writing, GitHub has become as popular as RubyForge for distributing gems, especially since it makes working collaboratively so easy. Make sure to check out the GitHub site for more information to see if it will fit into your workflow. GitHub also builds and hosts RubyGem files for projects that include a gemspec file, so it can be a handy alternative to RubyForge if using Git is part of your workflow.
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