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rubygems-deep_fetch

Adds a deep_fetch command to rubygems, fetches a gem and its dependencies.

The deep_fetch command will not fetch the gems already installed.

This tiny gem command makes it easy to review the gem you are about to install and its dependencies you miss locally.

Installation

Install using rubygems:

$ gem install rubygems-deep_fetch

It requires Rubygems 2.0.0 or later becauses it is based on Gem::DependencyResolver.

Usage

This is just like gem fetch:

$ gem deep_fetch GEMNAME [GEMNAME ...] [options]

See gem help deep_fetch.

Example

Let's suppose I plan to install a fresh version of sinatra. This gem has 3 dependencies:

$ gem dependency sinatra --version 1.4.3 --remote
Gem sinatra-1.4.3
  rack (~> 1.4)
  rack-protection (~> 1.4)
  tilt (>= 1.3.4, ~> 1.3)

tilt is already installed on my machine, so I don't care about that one.

$ gem list tilt --local | grep tilt
tilt (1.4.1)

Now, I want to fetch sinatra and all the gems I miss locally.

$ gem deep_fetch sinatra --version 1.4.3
Downloaded sinatra-1.4.3
Downloaded rack-1.5.2
Downloaded rack-protection-1.5.0

$ ls *gem -1
rack-1.5.2.gem
rack-protection-1.5.0.gem
sinatra-1.4.3.gem

That's it. I can now unpack the gems using gem unpack and review them before safely running gem install.

Bugs

When used with Rubygems 2.0.0, it will create empty directories like cache or doc. This bugs comes from Rubygems itself and it has been fixed in 2.1.0. See rubygems/rubygems#482

Disclaimer

No test so far.

No "platform" option so far.

Contributing

  1. Fork it
  2. Create your feature branch (git checkout -b my-new-feature)
  3. Commit your changes (git commit -am 'Added some feature')
  4. Push to the branch (git push origin my-new-feature)
  5. Create new Pull Request

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A rubygems plugin to fetch a gem with its dependencies

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