Module: Gem

Defined in:
lib/vmbuilder_plugins/gem.rb

Overview

Purpose

Gem is a Capistrano plugin module providing a set of methods that invoke the gem package manager.

Installs within Capistrano as the plugin gem.

Usage

require 'vmbuilder_plugins/gem'

Prefix all calls to the library with gem.

Constant Summary collapse

GEM_INSTALL =

Default install command

  • doesn’t install documentation

  • installs all required dependencies automatically.

"gem install --no-rdoc --no-ri"
GEM_UPDATE = 
GEM_INSTALL.sub("install", "update")

Instance Method Summary collapse

Instance Method Details

#cleanup ⇒ Object

Removes old versions of gems from installation area.



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# File 'lib/vmbuilder_plugins/gem.rb', line 45

def cleanup
  send(run_method, "gem cleanup")
end

#install(packages, version = nil) ⇒ Object

Installs the gems detailed in packages, selecting version version if specified.

packages can be a single string or an array of strings.



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# File 'lib/vmbuilder_plugins/gem.rb', line 54

def install(packages, version=nil)
  send(run_method,"#{GEM_INSTALL} #{if version then '-v '+version.to_s end} #{packages.to_a.join(' ')}")
end

#select(package, version = nil, platform = 'ruby') ⇒ Object

Auto selects a gem from a list and installs it.

gem has no mechanism on the command line of disambiguating builds for different platforms, and instead asks the user. This method has the necessary conversation to select the version relevant to platform (or the one nearest the top of the list if you don’t specify version).



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# File 'lib/vmbuilder_plugins/gem.rb', line 64

def select(package, version=nil, platform='ruby')
  selections={}
  cmd="#{GEM_INSTALL} #{if version then '-v '+version.to_s end} #{package}"
  send run_method, cmd do |channel, stream, data|
    data.each_line do | line |
	case line
	when /\s(\d+).*\(#{platform}\)/
 if selections[channel[:host]].nil?
   selections[channel[:host]]=$1.dup+"\n"
   logger.info "Selecting #$&", "#{stream} :: #{channel[:host]}"
 end
	when /\s\d+\./
 # Discard other selections from data stream
	when /^>/
 channel.send_data selections[channel[:host]]
 logger.debug line, "#{stream} :: #{channel[:host]}"
	else
 logger.info line, "#{stream} :: #{channel[:host]}"
	end
    end
  end
end

#update_system ⇒ Object

Upgrade the gem system to the latest version. Runs via sudo



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# File 'lib/vmbuilder_plugins/gem.rb', line 34

def update_system
  send(run_method, "#{GEM_UPDATE} --system")
end

#upgrade ⇒ Object

Updates all the installed gems to the latest version. Runs via sudo. Don’t use this command if any of the gems require a version selection.



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# File 'lib/vmbuilder_plugins/gem.rb', line 40

def upgrade
  send(run_method, GEM_UPDATE)
end