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#--
# Copyright 2006 by Chad Fowler, Rich Kilmer, Jim Weirich and others.
# All rights reserved.
# See LICENSE.txt for permissions.
#++
require 'rubygems/exceptions'
require 'rubygems/package'
require 'rubygems/ext'
require 'rubygems/user_interaction'
##
# The installer installs the files contained in the .gem into the Gem.home.
#
# Gem::Installer does the work of putting files in all the right places on the
# filesystem including unpacking the gem into its gem dir, installing the
# gemspec in the specifications dir, storing the cached gem in the cache dir,
# and installing either wrappers or symlinks for executables.
#
# The installer invokes pre and post install hooks. Hooks can be added either
# through a rubygems_plugin.rb file in an installed gem or via a
# rubygems/defaults/#{RUBY_ENGINE}.rb or rubygems/defaults/operating_system.rb
# file. See Gem.pre_install and Gem.post_install for details.
class Gem::Installer
##
# Paths where env(1) might live. Some systems are broken and have it in
# /bin
ENV_PATHS = %w[/usr/bin/env /bin/env]
##
# Raised when there is an error while building extensions.
#
class ExtensionBuildError < Gem::InstallError; end
include Gem::UserInteraction
# DOC: Missing docs or :nodoc:.
attr_reader :gem
##
# The directory a gem's executables will be installed into
attr_reader :bin_dir
##
# The gem repository the gem will be installed into
attr_reader :gem_home
##
# The options passed when the Gem::Installer was instantiated.
attr_reader :options
@path_warning = false
class << self
##
# True if we've warned about PATH not including Gem.bindir
attr_accessor :path_warning
# DOC: Missing docs or :nodoc:.
attr_writer :exec_format
# Defaults to use Ruby's program prefix and suffix.
def exec_format
@exec_format ||= Gem.default_exec_format
end
end
##
# Constructs an Installer instance that will install the gem located at
# +gem+. +options+ is a Hash with the following keys:
#
# :bin_dir:: Where to put a bin wrapper if needed.
# :development:: Whether or not development dependencies should be installed.
# :env_shebang:: Use /usr/bin/env in bin wrappers.
# :force:: Overrides all version checks and security policy checks, except
# for a signed-gems-only policy.
# :format_executable:: Format the executable the same as the ruby executable.
# If your ruby is ruby18, foo_exec will be installed as
# foo_exec18.
# :ignore_dependencies:: Don't raise if a dependency is missing.
# :install_dir:: The directory to install the gem into.
# :security_policy:: Use the specified security policy. See Gem::Security
# :user_install:: Indicate that the gem should be unpacked into the users
# personal gem directory.
# :only_install_dir:: Only validate dependencies against what is in the
# install_dir
# :wrappers:: Install wrappers if true, symlinks if false.
# :build_args:: An Array of arguments to pass to the extension builder
# process. If not set, then Gem::Command.build_args is used
def initialize(gem, options={})
require 'fileutils'
@gem = gem
@options = options
@package = Gem::Package.new @gem
process_options
@package.security_policy = @security_policy
if options[:user_install] and not options[:unpack] then
@gem_home = Gem.user_dir
check_that_user_bin_dir_is_in_path
end
end
##
# Checks if +filename+ exists in +@bin_dir+.
#
# If +@force+ is set +filename+ is overwritten.
#
# If +filename+ exists and is a RubyGems wrapper for different gem the user
# is consulted.
#
# If +filename+ exists and +@bin_dir+ is Gem.default_bindir (/usr/local) the
# user is consulted.
#
# Otherwise +filename+ is overwritten.
def check_executable_overwrite filename # :nodoc:
return if @force
generated_bin = File.join @bin_dir, filename
return unless File.exist? generated_bin
ruby_executable = false
existing = nil
open generated_bin, 'rb' do |io|
next unless io.gets =~ /^#!/ # shebang
io.gets # blankline
# TODO detect a specially formatted comment instead of trying
# to run a regexp against ruby code.
next unless io.gets =~ /This file was generated by RubyGems/
ruby_executable = true
existing = io.read.slice(/^gem (['"])(.*?)(\1),/, 2)
end
return if spec.name == existing
# somebody has written to RubyGems' directory, overwrite, too bad
return if Gem.default_bindir != @bin_dir and not ruby_executable
question = "#{spec.name}'s executable \"#{filename}\" conflicts with "
if ruby_executable then
question << existing
return if ask_yes_no "#{question}\nOverwrite the executable?", false
conflict = "installed executable from #{existing}"
else
question << generated_bin
return if ask_yes_no "#{question}\nOverwrite the executable?", false
conflict = generated_bin
end
raise Gem::InstallError,
"\"#{filename}\" from #{spec.name} conflicts with #{conflict}"
end
##
# Lazy accessor for the spec's gem directory.
def gem_dir
@gem_dir ||= File.join(gem_home, "gems", spec.full_name)
end
##
# Lazy accessor for the installer's spec.
def spec
@spec ||= @package.spec
rescue Gem::Package::Error => e
raise Gem::InstallError, "invalid gem: #{e.message}"
end
##
# Installs the gem and returns a loaded Gem::Specification for the installed
# gem.
#
# The gem will be installed with the following structure:
#
# @gem_home/
# cache/<gem-version>.gem #=> a cached copy of the installed gem
# gems/<gem-version>/... #=> extracted files
# specifications/<gem-version>.gemspec #=> the Gem::Specification
def install
verify_gem_home(options[:unpack])
# If we're forcing the install then disable security unless the security
# policy says that we only install signed gems.
@security_policy = nil if @force and @security_policy and
not @security_policy.only_signed
unless @force
ensure_required_ruby_version_met
ensure_required_rubygems_version_met
ensure_dependencies_met unless @ignore_dependencies
end
run_pre_install_hooks
Gem.ensure_gem_subdirectories gem_home
# Completely remove any previous gem files
FileUtils.rm_rf(gem_dir)
FileUtils.mkdir_p gem_dir
extract_files
build_extensions
run_post_build_hooks
generate_bin
write_spec
unless @build_args.empty?
File.open spec.build_info_file, "w" do |f|
@build_args.each { |a| f.puts a }
end
end
# TODO should be always cache the file? Other classes have options
# to controls if caching is done.
cache_file = File.join(gem_home, "cache", "#{spec.full_name}.gem")
FileUtils.cp gem, cache_file unless File.exist? cache_file
say spec.post_install_message unless spec.post_install_message.nil?
spec.loaded_from = spec_file
Gem::Specification.add_spec spec unless Gem::Specification.include? spec
run_post_install_hooks
spec
# TODO This rescue is in the wrong place. What is raising this exception?
# move this rescue to arround the code that actually might raise it.
rescue Zlib::GzipFile::Error
raise Gem::InstallError, "gzip error installing #{gem}"
end
def run_pre_install_hooks # :nodoc:
Gem.pre_install_hooks.each do |hook|
if hook.call(self) == false then
location = " at #{$1}" if hook.inspect =~ /@(.*:\d+)/
message = "pre-install hook#{location} failed for #{spec.full_name}"
raise Gem::InstallError, message
end
end
end
def run_post_build_hooks # :nodoc:
Gem.post_build_hooks.each do |hook|
if hook.call(self) == false then
FileUtils.rm_rf gem_dir
location = " at #{$1}" if hook.inspect =~ /@(.*:\d+)/
message = "post-build hook#{location} failed for #{spec.full_name}"
raise Gem::InstallError, message
end
end
end
def run_post_install_hooks # :nodoc:
Gem.post_install_hooks.each do |hook|
hook.call self
end
end
##
#
# Return an Array of Specifications contained within the gem_home
# we'll be installing into.
def installed_specs
@specs ||= begin
specs = []
Dir[File.join(gem_home, "specifications", "*.gemspec")].each do |path|
spec = Gem::Specification.load path.untaint
specs << spec if spec
end
specs
end
end
##
# Ensure that the dependency is satisfied by the current installation of
# gem. If it is not an exception is raised.
#
# spec :: Gem::Specification
# dependency :: Gem::Dependency
def ensure_dependency(spec, dependency)
unless installation_satisfies_dependency? dependency then
raise Gem::InstallError, "#{spec.name} requires #{dependency}"
end
true
end
##
# True if the gems in the system satisfy +dependency+.
def installation_satisfies_dependency?(dependency)
return true if installed_specs.detect { |s| dependency.matches_spec? s }
return false if @only_install_dir
not dependency.matching_specs.empty?
end
##
# Unpacks the gem into the given directory.
def unpack(directory)
@gem_dir = directory
extract_files
end
##
# The location of of the spec file that is installed.
#
def spec_file
File.join gem_home, "specifications", "#{spec.full_name}.gemspec"
end
##
# Writes the .gemspec specification (in Ruby) to the gem home's
# specifications directory.
def write_spec
File.open(spec_file, "w") do |file|
file.puts spec.to_ruby_for_cache
end
end
##
# Creates windows .bat files for easy running of commands
def generate_windows_script(filename, bindir)
if Gem.win_platform? then
script_name = filename + ".bat"
script_path = File.join bindir, File.basename(script_name)
File.open script_path, 'w' do |file|
file.puts windows_stub_script(bindir, filename)
end
say script_path if Gem.configuration.really_verbose
end
end
# DOC: Missing docs or :nodoc:.
def generate_bin
return if spec.executables.nil? or spec.executables.empty?
Dir.mkdir @bin_dir unless File.exist? @bin_dir
raise Gem::FilePermissionError.new(@bin_dir) unless File.writable? @bin_dir
spec.executables.each do |filename|
filename.untaint
bin_path = File.join gem_dir, spec.bindir, filename
unless File.exist? bin_path then
# TODO change this to a more useful warning
warn "Hey?!?! Where did #{bin_path} go??"
next
end
mode = File.stat(bin_path).mode | 0111
FileUtils.chmod mode, bin_path
check_executable_overwrite filename
if @wrappers then
generate_bin_script filename, @bin_dir
else
generate_bin_symlink filename, @bin_dir
end
end
end
##
# Creates the scripts to run the applications in the gem.
#--
# The Windows script is generated in addition to the regular one due to a
# bug or misfeature in the Windows shell's pipe. See
# http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-talk/193379
def generate_bin_script(filename, bindir)
bin_script_path = File.join bindir, formatted_program_filename(filename)
FileUtils.rm_f bin_script_path # prior install may have been --no-wrappers
File.open bin_script_path, 'wb', 0755 do |file|
file.print app_script_text(filename)
end
say bin_script_path if Gem.configuration.really_verbose
generate_windows_script filename, bindir
end
##
# Creates the symlinks to run the applications in the gem. Moves
# the symlink if the gem being installed has a newer version.
def generate_bin_symlink(filename, bindir)
if Gem.win_platform? then
alert_warning "Unable to use symlinks on Windows, installing wrapper"
generate_bin_script filename, bindir
return
end
src = File.join gem_dir, spec.bindir, filename
dst = File.join bindir, formatted_program_filename(filename)
if File.exist? dst then
if File.symlink? dst then
link = File.readlink(dst).split File::SEPARATOR
cur_version = Gem::Version.create(link[-3].sub(/^.*-/, ''))
return if spec.version < cur_version
end
File.unlink dst
end
FileUtils.symlink src, dst, :verbose => Gem.configuration.really_verbose
end
##
# Generates a #! line for +bin_file_name+'s wrapper copying arguments if
# necessary.
#
# If the :custom_shebang config is set, then it is used as a template
# for how to create the shebang used for to run a gem's executables.
#
# The template supports 4 expansions:
#
# $env the path to the unix env utility
# $ruby the path to the currently running ruby interpreter
# $exec the path to the gem's executable
# $name the name of the gem the executable is for
#
def shebang(bin_file_name)
ruby_name = Gem::ConfigMap[:ruby_install_name] if @env_shebang
path = File.join gem_dir, spec.bindir, bin_file_name
first_line = File.open(path, "rb") {|file| file.gets}
if /\A#!/ =~ first_line then
# Preserve extra words on shebang line, like "-w". Thanks RPA.
shebang = first_line.sub(/\A\#!.*?ruby\S*((\s+\S+)+)/, "#!#{Gem.ruby}")
opts = $1
shebang.strip! # Avoid nasty ^M issues.
end
if which = Gem.configuration[:custom_shebang]
which = which.gsub(/\$(\w+)/) do
case $1
when "env"
@env_path ||= ENV_PATHS.find do |env_path|
File.executable? env_path
end
when "ruby"
"#{Gem.ruby}#{opts}"
when "exec"
bin_file_name
when "name"
spec.name
end
end
return "#!#{which}"
end
if not ruby_name then
"#!#{Gem.ruby}#{opts}"
elsif opts then
"#!/bin/sh\n'exec' #{ruby_name.dump} '-x' \"$0\" \"$@\"\n#{shebang}"
else
# Create a plain shebang line.
@env_path ||= ENV_PATHS.find {|env_path| File.executable? env_path }
"#!#{@env_path} #{ruby_name}"
end
end
# DOC: Missing docs or :nodoc:.
def ensure_required_ruby_version_met
if rrv = spec.required_ruby_version then
unless rrv.satisfied_by? Gem.ruby_version then
raise Gem::InstallError, "#{spec.name} requires Ruby version #{rrv}."
end
end
end
# DOC: Missing docs or :nodoc:.
def ensure_required_rubygems_version_met
if rrgv = spec.required_rubygems_version then
unless rrgv.satisfied_by? Gem.rubygems_version then
raise Gem::InstallError,
"#{spec.name} requires RubyGems version #{rrgv}. " +
"Try 'gem update --system' to update RubyGems itself."
end
end
end
# DOC: Missing docs or :nodoc:.
def ensure_dependencies_met
deps = spec.runtime_dependencies
deps |= spec.development_dependencies if @development
deps.each do |dep_gem|
ensure_dependency spec, dep_gem
end
end
# DOC: Missing docs or :nodoc:.
def process_options
@options = {
:bin_dir => nil,
:env_shebang => false,
:force => false,
:install_dir => Gem.dir,
:only_install_dir => false
}.merge options
@env_shebang = options[:env_shebang]
@force = options[:force]
@gem_home = options[:install_dir]
@ignore_dependencies = options[:ignore_dependencies]
@format_executable = options[:format_executable]
@security_policy = options[:security_policy]
@wrappers = options[:wrappers]
@only_install_dir = options[:only_install_dir]
# If the user has asked for the gem to be installed in a directory that is
# the system gem directory, then use the system bin directory, else create
# (or use) a new bin dir under the gem_home.
@bin_dir = options[:bin_dir] || Gem.bindir(gem_home)
@development = options[:development]
@build_args = options[:build_args] || Gem::Command.build_args
end
# DOC: Missing docs or :nodoc:.
def check_that_user_bin_dir_is_in_path
user_bin_dir = @bin_dir || Gem.bindir(gem_home)
user_bin_dir.gsub!(File::SEPARATOR, File::ALT_SEPARATOR) if File::ALT_SEPARATOR
path = ENV['PATH']
if Gem.win_platform? then
path = path.downcase
user_bin_dir = user_bin_dir.downcase
end
unless path.split(File::PATH_SEPARATOR).include? user_bin_dir then
unless self.class.path_warning then
alert_warning "You don't have #{user_bin_dir} in your PATH,\n\t gem executables will not run."
self.class.path_warning = true
end
end
end
# DOC: Missing docs or :nodoc:.
def verify_gem_home(unpack = false)
FileUtils.mkdir_p gem_home
raise Gem::FilePermissionError, gem_home unless
unpack or File.writable?(gem_home)
end
##
# Return the text for an application file.
def app_script_text(bin_file_name)
return <<-TEXT
#{shebang bin_file_name}
#
# This file was generated by RubyGems.
#
# The application '#{spec.name}' is installed as part of a gem, and
# this file is here to facilitate running it.
#
require 'rubygems'
version = "#{Gem::Requirement.default}"
if ARGV.first
str = ARGV.first
str = str.dup.force_encoding("BINARY") if str.respond_to? :force_encoding
if str =~ /\\A_(.*)_\\z/
version = $1
ARGV.shift
end
end
gem '#{spec.name}', version
load Gem.bin_path('#{spec.name}', '#{bin_file_name}', version)
TEXT
end
##
# return the stub script text used to launch the true ruby script
def windows_stub_script(bindir, bin_file_name)
ruby = File.basename(Gem.ruby).chomp('"')
return <<-TEXT
@ECHO OFF
IF NOT "%~f0" == "~f0" GOTO :WinNT
@"#{ruby}" "#{File.join(bindir, bin_file_name)}" %1 %2 %3 %4 %5 %6 %7 %8 %9
GOTO :EOF
:WinNT
@"#{ruby}" "%~dpn0" %*
TEXT
end
##
# Builds extensions. Valid types of extensions are extconf.rb files,
# configure scripts and rakefiles or mkrf_conf files.
def build_extensions
return if spec.extensions.empty?
if @build_args.empty?
say "Building native extensions. This could take a while..."
else
say "Building native extensions with: '#{@build_args.join(' ')}'"
say "This could take a while..."
end
dest_path = File.join gem_dir, spec.require_paths.first
ran_rake = false # only run rake once
spec.extensions.each do |extension|
break if ran_rake
results = []
extension ||= ""
extension_dir = File.join gem_dir, File.dirname(extension)
builder = case extension
when /extconf/ then
Gem::Ext::ExtConfBuilder
when /configure/ then
Gem::Ext::ConfigureBuilder
when /rakefile/i, /mkrf_conf/i then
ran_rake = true
Gem::Ext::RakeBuilder
else
message = "No builder for extension '#{extension}'"
extension_build_error extension_dir, message
end
begin
Dir.chdir extension_dir do
results = builder.build(extension, gem_dir, dest_path,
results, @build_args)
say results.join("\n") if Gem.configuration.really_verbose
end
rescue
extension_build_error(extension_dir, results.join("\n"))
end
end
end
##
# Logs the build +output+ in +build_dir+, then raises ExtensionBuildError.
def extension_build_error(build_dir, output)
gem_make_out = File.join build_dir, 'gem_make.out'
open gem_make_out, 'wb' do |io| io.puts output end
message = <<-EOF
ERROR: Failed to build gem native extension.
#{output}
Gem files will remain installed in #{gem_dir} for inspection.
Results logged to #{gem_make_out}
EOF
raise ExtensionBuildError, message
end
##
# Reads the file index and extracts each file into the gem directory.
#
# Ensures that files can't be installed outside the gem directory.
def extract_files
@package.extract_files gem_dir
end
##
# Prefix and suffix the program filename the same as ruby.
def formatted_program_filename(filename)
if @format_executable then
self.class.exec_format % File.basename(filename)
else
filename
end
end
##
#
# Return the target directory where the gem is to be installed. This
# directory is not guaranteed to be populated.
#
def dir
gem_dir.to_s
end
end
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