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# Extensions for the Omnibus tool that allow using it to generate morphologies.
#
# Copyright (C) 2014 Codethink Limited
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; version 2 of the License.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
require 'omnibus'
require 'optparse'
require 'rubygems/commands/build_command'
require 'rubygems/commands/install_command'
require 'shellwords'
class Omnibus::Builder
# It's possible to use `gem install` in build commands, which is a great
# way of subverting the dependency tracking Omnibus provides. It's done
# in `omnibus-chef/config/software/chefdk.rb`, for example.
#
# To handle this, here we extend the class that executes the build commands
# to detect when `gem install` is run. It uses the Gem library to turn the
# commandline back into a Bundler::Dependency object that we can use.
#
# We also trap `gem build` so we know when a software component is a RubyGem
# that should be handled by 'rubygems.to_chunk'.
class GemBuildCommandParser < Gem::Commands::BuildCommand
def gemspec_path(args)
handle_options args
if options[:args].length != 1
raise "Invalid `gem build` commandline: 1 argument expected, got " \
"#{options[:args]}."
end
options[:args][0]
end
end
class GemInstallCommandParser < Gem::Commands::InstallCommand
def dependency_list_from_commandline(args)
handle_options args
# `gem install foo*` is sometimes used when installing a locally built
# Gem, to avoid needing to know the exact version number that was built.
# We only care about remote Gems being installed, so anything with a '*'
# in its name can be ignored.
gem_names = options[:args].delete_if { |name| name.include?('*') }
gem_names.collect do |gem_name|
Bundler::Dependency.new(gem_name, options[:version])
end
end
end
def gem(command, options = {})
# This function re-implements the 'gem' function in the build-commands DSL.
if command.start_with? 'build'
parser = GemBuildCommandParser.new
args = Shellwords.split(command).drop(1)
if built_gemspec != nil
raise "More than one `gem build` command was run as part f the build " \
"process. The 'rubygems.to_chunk' program currently supports " \
"only one .gemspec build per chunk, so this can't be " \
"processed automatically."
end
@built_gemspec = parser.gemspec_path(args)
elsif command.start_with? 'install'
parser = GemInstallCommandParser.new
args = Shellwords.split(command).drop(1)
args_without_build_flags = args.take_while { |item| item != '--' }
gems = parser.dependency_list_from_commandline(args_without_build_flags)
manually_installed_rubygems.concat gems
end
end
def built_gemspec
@built_gemspec
end
def manually_installed_rubygems
@manually_installed_rubygems ||= []
end
end
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