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require 'erb'
require 'rubygems/dependency_installer'
module Bundler
class Installer < Environment
class << self
attr_accessor :post_install_messages
end
# Begins the installation process for Bundler.
# For more information see the #run method on this class.
def self.install(root, definition, options = {})
installer = new(root, definition)
installer.run(options)
installer
end
# Runs the install procedures for a specific Gemfile.
#
# Firstly, this method will check to see if Bundler.bundle_path exists
# and if not then will create it. This is usually the location of gems
# on the system, be it RVM or at a system path.
#
# Secondly, it checks if Bundler has been configured to be "frozen"
# Frozen ensures that the Gemfile and the Gemfile.lock file are matching.
# This stops a situation where a developer may update the Gemfile but may not run
# `bundle install`, which leads to the Gemfile.lock file not being correctly updated.
# If this file is not correctly updated then any other developer running
# `bundle install` will potentially not install the correct gems.
#
# Thirdly, Bundler checks if there are any dependencies specified in the Gemfile using
# Bundler::Environment#dependencies. If there are no dependencies specified then
# Bundler returns a warning message stating so and this method returns.
#
# Fourthly, Bundler checks if the default lockfile (Gemfile.lock) exists, and if so
# then proceeds to set up a defintion based on the default gemfile (Gemfile) and the
# default lock file (Gemfile.lock). However, this is not the case if the platform is different
# to that which is specified in Gemfile.lock, or if there are any missing specs for the gems.
#
# Fifthly, Bundler resolves the dependencies either through a cache of gems or by remote.
# This then leads into the gems being installed, along with stubs for their executables,
# but only if the --binstubs option has been passed or Bundler.options[:bin] has been set
# earlier.
#
# Sixthly, a new Gemfile.lock is created from the installed gems to ensure that the next time
# that a user runs `bundle install` they will receive any updates from this process.
#
# Finally: TODO add documentation for how the standalone process works.
def run(options)
# Create the BUNDLE_PATH directory
begin
Bundler.bundle_path.mkpath unless Bundler.bundle_path.exist?
rescue Errno::EEXIST
raise PathError, "Could not install to path `#{Bundler.settings[:path]}` " +
"because of an invalid symlink. Remove the symlink so the directory can be created."
end
if Bundler.settings[:frozen]
@definition.ensure_equivalent_gemfile_and_lockfile(options[:deployment])
end
if dependencies.empty?
Bundler.ui.warn "The Gemfile specifies no dependencies"
lock
return
end
if Bundler.default_lockfile.exist? && !options["update"]
begin
tmpdef = Definition.build(Bundler.default_gemfile, Bundler.default_lockfile, nil)
local = true unless tmpdef.new_platform? || tmpdef.missing_specs.any?
rescue BundlerError
end
end
# Since we are installing, we can resolve the definition
# using remote specs
unless local
options["local"] ?
@definition.resolve_with_cache! :
@definition.resolve_remotely!
end
# Must install gems in the order that the resolver provides
# as dependencies might actually affect the installation of
# the gem.
Installer.post_install_messages = {}
specs.each do |spec|
install_gem_from_spec(spec, options[:standalone])
end
lock
generate_standalone(options[:standalone]) if options[:standalone]
end
private
def install_gem_from_spec(spec, standalone = false)
# Download the gem to get the spec, because some specs that are returned
# by rubygems.org are broken and wrong.
Bundler::Fetcher.fetch(spec) if spec.source.is_a?(Bundler::Source::Rubygems)
# Fetch the build settings, if there are any
settings = Bundler.settings["build.#{spec.name}"]
Bundler.rubygems.with_build_args [settings] do
spec.source.install(spec)
Bundler.ui.debug "from #{spec.loaded_from} "
end
# newline comes after installing, some gems say "with native extensions"
Bundler.ui.info ""
if Bundler.settings[:bin]
standalone ? generate_standalone_bundler_executable_stubs(spec) : generate_bundler_executable_stubs(spec)
end
FileUtils.rm_rf(Bundler.tmp)
rescue Exception => e
# install hook failed
raise e if e.is_a?(Bundler::InstallHookError)
# other failure, likely a native extension build failure
Bundler.ui.info ""
Bundler.ui.warn "#{e.class}: #{e.message}"
msg = "An error occurred while installing #{spec.name} (#{spec.version}),"
msg << " and Bundler cannot continue.\nMake sure that `gem install"
msg << " #{spec.name} -v '#{spec.version}'` succeeds before bundling."
Bundler.ui.debug e.backtrace.join("\n")
raise Bundler::InstallError, msg
end
def generate_bundler_executable_stubs(spec)
# double-assignment to avoid warnings about variables that will be used by ERB
bin_path = bin_path = Bundler.bin_path
template = template = File.read(File.expand_path('../templates/Executable', __FILE__))
relative_gemfile_path = relative_gemfile_path = Bundler.default_gemfile.relative_path_from(bin_path)
ruby_command = ruby_command = Thor::Util.ruby_command
spec.executables.each do |executable|
next if executable == "bundle"
File.open "#{bin_path}/#{executable}", 'w', 0755 do |f|
f.puts ERB.new(template, nil, '-').result(binding)
end
end
end
def generate_bundle_aware_executable_stubs(spec)
# double-assignment to avoid warnings about variables that will be used by ERB
bin_path = bin_path = Bundler.bin_path
template = template = File.read(File.expand_path('../templates/Executable', __FILE__))
relative_gemfile_path = relative_gemfile_path = Bundler.default_gemfile.relative_path_from(bin_path)
ruby_command = ruby_command = Thor::Util.ruby_command
spec.executables.each do |executable|
next if executable == "bundle"
File.open "#{bin_path}/#{executable}", 'w', 0755 do |f|
f.puts ERB.new(template, nil, '-').result(binding)
end
end
end
def generate_standalone_bundler_executable_stubs(spec)
# double-assignment to avoid warnings about variables that will be used by ERB
bin_path = Bundler.bin_path
template = File.read(File.expand_path('../templates/Executable.standalone', __FILE__))
ruby_command = ruby_command = Thor::Util.ruby_command
spec.executables.each do |executable|
next if executable == "bundle"
standalone_path = standalone_path = Pathname(Bundler.settings[:path]).expand_path.relative_path_from(bin_path)
executable_path = executable_path = Pathname(spec.full_gem_path).join(spec.bindir, executable).relative_path_from(bin_path)
File.open "#{bin_path}/#{executable}", 'w', 0755 do |f|
f.puts ERB.new(template, nil, '-').result(binding)
end
end
end
def generate_standalone(groups)
standalone_path = Bundler.settings[:path]
bundler_path = File.join(standalone_path, "bundler")
FileUtils.mkdir_p(bundler_path)
paths = []
if groups.empty?
specs = Bundler.definition.requested_specs
else
specs = Bundler.definition.specs_for groups.map { |g| g.to_sym }
end
specs.each do |spec|
next if spec.name == "bundler"
spec.require_paths.each do |path|
full_path = File.join(spec.full_gem_path, path)
paths << Pathname.new(full_path).relative_path_from(Bundler.root.join(bundler_path))
end
end
File.open File.join(bundler_path, "setup.rb"), "w" do |file|
file.puts "path = File.expand_path('..', __FILE__)"
paths.each do |path|
file.puts %{$:.unshift File.expand_path("\#{path}/#{path}")}
end
end
end
end
end
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