nixpkgs/pkgs/development/interpreters/ruby/monkey_patches.rb
2015-01-20 22:20:28 -05:00

244 lines
6.6 KiB
Ruby

require 'bundler'
# Undo the RUBYOPT trickery.
opt = ENV['RUBYOPT'].dup
opt.gsub!(/-rmonkey_patches.rb -I [^ ]*/, '')
ENV['RUBYOPT'] = opt
Bundler.module_eval do
class << self
# mappings from original uris to store paths.
def nix_gem_sources
@nix_gem_sources ||=
begin
src = ENV['NIX_GEM_SOURCES']
eval(Bundler.read_file(src))
end
end
# extract the gemspecs from the gems pulled from Rubygems.
def nix_gemspecs
@nix_gemspecs ||= Dir.glob("gems/*.gem").map do |path|
Bundler.rubygems.spec_from_gem(path)
end
end
# swap out ENV
def nix_with_env(env, &block)
if env
old_env = ENV.to_hash
begin
ENV.replace(env)
block.call
ensure
ENV.replace(old_env)
end
else
block.call
end
end
# map a git uri to a fetchgit store path.
def nix_git(uri)
Pathname.new(nix_gem_sources["git"][uri])
end
end
end
Bundler::Source::Git::GitProxy.class_eval do
def checkout
unless path.exist?
FileUtils.mkdir_p(path.dirname)
FileUtils.cp_r(Bundler.nix_git(@uri).join(".git"), path)
system("chmod -R +w #{path}")
end
end
def copy_to(destination, submodules=false)
unless File.exist?(destination.join(".git"))
FileUtils.mkdir_p(destination.dirname)
FileUtils.cp_r(Bundler.nix_git(@uri), destination)
system("chmod -R +w #{destination}")
end
end
end
Bundler::Fetcher.class_eval do
def use_api
true
end
def fetch_dependency_remote_specs(gem_names)
Bundler.ui.debug "Query Gemcutter Dependency Endpoint API: #{gem_names.join(',')}"
deps_list = []
spec_list = gem_names.map do |name|
spec = Bundler.nix_gemspecs.detect {|spec| spec.name == name }
dependencies = spec.dependencies.
select {|dep| dep.type != :development}.
map do |dep|
deps_list << dep.name
dep
end
[spec.name, spec.version, spec.platform, dependencies]
end
[spec_list, deps_list.uniq]
end
end
Bundler::Source::Rubygems.class_eval do
# We copy all gems into $PWD/gems, and this allows RubyGems to find those
# gems during installation.
def fetchers
@fetchers ||= [
Bundler::Fetcher.new(URI.parse("file://#{File.expand_path(Dir.pwd)}"))
]
end
# Look-up gems that were originally from RubyGems.
def remote_specs
@remote_specs ||=
begin
lockfile = Bundler::LockfileParser.new(Bundler.read_file(Bundler.default_lockfile))
gem_names = lockfile.specs.
select {|spec| spec.source.is_a?(Bundler::Source::Rubygems)}.
map {|spec| spec.name}
idx = Bundler::Index.new
api_fetchers.each do |f|
Bundler.ui.info "Fetching source index from #{f.uri}"
idx.use f.specs(gem_names, self)
end
idx
end
end
end
Bundler::Installer.class_eval do
# WHY:
# This allows us to provide a typical Nix experience, where
# `buildInputs` and/or `preInstall` may set up the $PATH and other env-vars
# as needed. By swapping out the environment per install, we can have finer
# grained control than we would have otherwise.
#
# HOW:
# This is a wrapper around the original `install_gem_from_spec`.
# We expect that a "pre-installer" might exist at `pre-installers/<gem-name>`,
# and if it does, we execute it.
# The pre-installer is expected to dump its environment variables as a Ruby
# hash to `env/<gem-name>`.
# We then swap out the environment for the duration of the install,
# and then set it back to what it was originally.
alias original_install_gem_from_spec install_gem_from_spec
def install_gem_from_spec(spec, standalone = false, worker = 0)
pre_installer = "pre-installers/#{spec.name}"
if File.exist?(pre_installer)
system(pre_installer)
unless $?.success?
Bundler.ui.error "The pre-installer script for #{spec.name} failed!"
exit 1
end
env = eval(Bundler.read_file("env/#{spec.name}"))
unless env
Bundler.ui.error "The environment variables for #{spec.name} could not be loaded!"
exit 1
end
Bundler.nix_with_env(env) do
original_install_gem_from_spec(spec, standalone, worker)
end
else
original_install_gem_from_spec(spec, standalone, worker)
end
end
def generate_bundler_executable_stubs(spec, options = {})
return if spec.executables.empty?
out = ENV['out']
spec.executables.each do |executable|
next if executable == "bundle" || executable == "bundler"
binstub_path = "#{out}/bin/#{executable}"
File.open(binstub_path, 'w', 0777 & ~File.umask) do |f|
f.print <<-TEXT
#!/usr/bin/env #{RbConfig::CONFIG['ruby_install_name']}
old_gemfile = ENV["BUNDLE_GEMFILE"]
old_gem_home = ENV["GEM_HOME"]
old_gem_path = ENV["GEM_PATH"]
ENV["BUNDLE_GEMFILE"] =
"#{ENV["BUNDLE_GEMFILE"]}"
ENV["GEM_HOME"] =
"#{ENV["GEM_HOME"]}"
ENV["GEM_PATH"] =
"#{ENV["NIX_BUNDLER_GEMPATH"]}:\#{ENV["GEM_HOME"]}\#{old_gem_path ? ":\#{old_gem_path}" : ""}}"
require 'rubygems'
require 'bundler/setup'
ENV["BUNDLE_GEMFILE"] = old_gemfile
ENV["GEM_HOME"] = old_gem_home
ENV["GEM_PATH"] = old_gem_path
load Gem.bin_path('#{spec.name}', '#{executable}')
TEXT
end
end
end
end
Gem::Installer.class_eval do
# Make the wrappers automagically use bundler.
#
# Stage 1.
# Set $BUNDLE_GEMFILE so bundler knows what gems to load.
# Set $GEM_HOME to the installed gems, because bundler looks there for
# non-Rubygems installed gems (e.g. git/svn/path sources).
# Set $GEM_PATH to include both bundler and installed gems.
#
# Stage 2.
# Setup bundler, locking down the gem versions.
#
# Stage 3.
# Reset $BUNDLE_GEMFILE, $GEM_HOME, $GEM_PATH.
#
# Stage 4.
# Run the actual executable.
def app_script_text(bin_file_name)
return <<-TEXT
#{shebang bin_file_name}
#
# This file was generated by Nix's RubyGems.
#
# The application '#{spec.name}' is installed as part of a gem, and
# this file is here to facilitate running it.
#
old_gemfile = ENV["BUNDLE_GEMFILE"]
old_gem_home = ENV["GEM_HOME"]
old_gem_path = ENV["GEM_PATH"]
ENV["BUNDLE_GEMFILE"] =
"#{ENV["BUNDLE_GEMFILE"]}"
ENV["GEM_HOME"] =
"#{ENV["GEM_HOME"]}"
ENV["GEM_PATH"] =
"#{ENV["NIX_BUNDLER_GEMPATH"]}:\#{ENV["GEM_HOME"]}\#{old_gem_path ? ":\#{old_gem_path}" : ""}}"
require 'rubygems'
require 'bundler/setup'
ENV["BUNDLE_GEMFILE"] = old_gemfile
ENV["GEM_HOME"] = old_gem_home
ENV["GEM_PATH"] = old_gem_path
load Gem.bin_path('#{spec.name}', '#{bin_file_name}')
TEXT
end
end