File: install.rb

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#! /usr/bin/env ruby
#--
# Copyright 2004 Austin Ziegler <ruby-install@halostatue.ca>
#   Install utility. Based on the original installation script for rdoc by the
#   Pragmatic Programmers.
#
# This program is free software. It may be redistributed and/or modified under
# the terms of the GPL version 2 (or later) or the Ruby licence.
#
# Usage
# -----
# In most cases, if you have a typical project layout, you will need to do
# absolutely nothing to make this work for you. This layout is:
#
#   bin/    # executable files -- "commands"
#   lib/    # the source of the library
#
# The default behaviour:
# 1) Install commands from bin/ into the Ruby bin directory. On Windows, if a
#    if a corresponding batch file (.bat or .cmd) exists in the bin directory,
#    it will be copied over as well. Otherwise, a batch file (always .bat) will
#    be created to run the specified command.
# 2) Install all library files ending in .rb from lib/ into Ruby's
#    site_lib/version directory.
#
#++

require 'rbconfig'
require 'find'
require 'fileutils'
require 'tempfile'
require 'optparse'
require 'ostruct'
include FileUtils

InstallOptions = OpenStruct.new

# Returns true if OS is windows (copied from facter/util/config.rb)
def is_windows?
  (defined?(RbConfig) ? RbConfig : Config)::CONFIG['host_os'] =~ /mswin|win32|dos|mingw|cygwin/i
end

def glob(list)
  g = list.map { |i| Dir.glob(i) }
  g.flatten!
  g.compact!
  g
end

def do_configs(configs, target, strip = 'ext/')
  Dir.mkdir(target) unless File.directory? target
  configs.each do |cf|
    ocf = File.join(InstallOptions.config_dir, cf.gsub(/#{strip}/, ''))
    install(cf, ocf, {:mode => 0644, :preserve => true, :verbose => true})
  end
end

def do_bins(bins, target, strip = 's?bin/')
  Dir.mkdir(target) unless File.directory? target
  bins.each do |bf|
    obf = bf.gsub(/#{strip}/, '')
    install_binfile(bf, obf, target)
  end
end

def do_libs(libs, strip = 'lib/')
  libs.each do |lf|
    olf = File.join(InstallOptions.site_dir, lf.gsub(/#{strip}/, ''))
    op = File.dirname(olf)
    makedirs(op, {:mode => 0755, :verbose => true})
    chmod(0755, op)
    install(lf, olf, {:mode => 0644, :preserve => true, :verbose => true})
  end
end

def do_man(man, strip = 'man/')
  man.each do |mf|
    omf = File.join(InstallOptions.man_dir, mf.gsub(/#{strip}/, ''))
    om = File.dirname(omf)
    makedirs(om, {:mode => 0755, :verbose => true})
    chmod(0755, om)
    install(mf, omf, {:mode => 0644, :preserve => true, :verbose => true})

    gzip = %x{which gzip}
    gzip.chomp!
    %x{#{gzip} -f #{omf}}
  end
end

##
# Prepare the file installation.
#
def prepare_installation
  InstallOptions.configs = true

  ARGV.options do |opts|
    opts.banner = "Usage: #{File.basename($0)} [options]"
    opts.separator ""
    opts.on('--[no-]configs', 'Prevents the installation of config files', 'Default off.') do |onconfigs|
      InstallOptions.configs = onconfigs
    end
    opts.on('--destdir[=OPTIONAL]', 'Installation prefix for all targets', 'Default essentially /') do |destdir|
      InstallOptions.destdir = destdir
    end
    opts.on('--configdir[=OPTIONAL]', 'Installation directory for config files', 'Default /etc') do |configdir|
      InstallOptions.configdir = configdir
    end
    opts.on('--bindir[=OPTIONAL]', 'Installation directory for binaries', 'overrides RbConfig::CONFIG["bindir"]') do |bindir|
      InstallOptions.bindir = bindir
    end
    opts.on('--ruby[=OPTIONAL]', 'Ruby interpreter to use with installation', 'overrides ruby used to call install.rb') do |ruby|
      InstallOptions.ruby = ruby
    end
    opts.on('--sitelibdir[=OPTIONAL]', 'Installation directory for libraries', 'overrides RbConfig::CONFIG["sitelibdir"]') do |sitelibdir|
      InstallOptions.sitelibdir = sitelibdir
    end
    opts.on('--mandir[=OPTIONAL]', 'Installation directory for man pages', 'overrides RbConfig::CONFIG["mandir"]') do |mandir|
      InstallOptions.mandir = mandir
    end
    opts.on('--full', 'Performs a full installation. All', 'optional installation steps are run.') do |full|
      InstallOptions.configs = true
    end
    opts.separator("")
    opts.on_tail('--help', "Shows this help text.") do
      STDERR.puts opts
      exit
    end

    opts.parse!
  end

  version = [RbConfig::CONFIG["MAJOR"], RbConfig::CONFIG["MINOR"]].join(".")
  libdir = File.join(RbConfig::CONFIG["libdir"], "ruby", version)

  # Mac OS X 10.5 and higher declare bindir
  # /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin
  # which is not generally where people expect executables to be installed
  # These settings are appropriate defaults for all OS X versions.
  if RUBY_PLATFORM =~ /^universal-darwin[\d\.]+$/
    RbConfig::CONFIG['bindir'] = "/usr/bin"
  end

  if InstallOptions.configdir
    configdir = InstallOptions.configdir
  elsif is_windows?
    begin
      require 'rubygems'
      require 'win32/dir'
    rescue LoadError => e
      puts "Cannot run on Microsoft Windows without the sys-admin, win32-process, win32-dir & win32-service gems: #{e}"
      exit(-1)
    end
    configdir = File.join(Dir::COMMON_APPDATA, "PuppetLabs", "hiera", "etc")
  else
    configdir = "/etc"
  end

  if InstallOptions.bindir
    bindir = InstallOptions.bindir
  else
    bindir = RbConfig::CONFIG['bindir']
  end

  if InstallOptions.sitelibdir
    sitelibdir = InstallOptions.sitelibdir
  else
    sitelibdir = RbConfig::CONFIG["sitelibdir"]
    if sitelibdir.nil?
      sitelibdir = $LOAD_PATH.find { |x| x =~ /site_ruby/ }
      if sitelibdir.nil?
        sitelibdir = File.join(libdir, "site_ruby")
      elsif sitelibdir !~ Regexp.quote(version)
        sitelibdir = File.join(sitelibdir, version)
      end
    end
  end

  if InstallOptions.mandir
    mandir = InstallOptions.mandir
  else
    mandir = RbConfig::CONFIG['mandir']
  end

  # This is the new way forward
  if InstallOptions.destdir
    destdir = InstallOptions.destdir
  else
    destdir = ''
  end

  configdir = join(destdir, configdir)
  bindir = join(destdir, bindir)
  mandir = join(destdir, mandir)
  sitelibdir = join(destdir, sitelibdir)

  makedirs(configdir) if InstallOptions.configs
  makedirs(bindir)
  makedirs(mandir)
  makedirs(sitelibdir)

  InstallOptions.site_dir = sitelibdir
  InstallOptions.config_dir = configdir
  InstallOptions.bin_dir  = bindir
  InstallOptions.lib_dir  = libdir
  InstallOptions.man_dir  = mandir
end

##
# Join two paths. On Windows, dir must be converted to a relative path,
# by stripping the drive letter, but only if the basedir is not empty.
#
def join(basedir, dir)
  return "#{basedir}#{dir[2..-1]}" if is_windows? and basedir.length > 0 and dir.length > 2

  "#{basedir}#{dir}"
end

##
# Install file(s) from ./bin to RbConfig::CONFIG['bindir']. Patch it on the way
# to insert a #! line; on a Unix install, the command is named as expected
# (e.g., bin/rdoc becomes rdoc); the shebang line handles running it. Under
# windows, we add an '.rb' extension and let file associations do their stuff.
def install_binfile(from, op_file, target)
  tmp_file = Tempfile.new('hiera-binfile')

  if not InstallOptions.ruby.nil?
    ruby = InstallOptions.ruby
  else
    ruby = File.join(RbConfig::CONFIG['bindir'], RbConfig::CONFIG['ruby_install_name'])
  end

  File.open(from) do |ip|
    File.open(tmp_file.path, "w") do |op|
      op.puts "#!#{ruby}"
      contents = ip.readlines
      contents.shift if contents[0] =~ /^#!/
      op.write contents.join
    end
  end

  if is_windows?
    installed_wrapper = false

    if File.exists?("#{from}.bat")
      install("#{from}.bat", File.join(target, "#{op_file}.bat"), :mode => 0755, :preserve => true, :verbose => true)
      installed_wrapper = true
    end

    if File.exists?("#{from}.cmd")
      install("#{from}.cmd", File.join(target, "#{op_file}.cmd"), :mode => 0755, :preserve => true, :verbose => true)
      installed_wrapper = true
    end

    if not installed_wrapper
      tmp_file2 = Tempfile.new('hiera-wrapper')
      cwv = <<-EOS
@echo off
SETLOCAL
if exist "%~dp0environment.bat" (
  call "%~dp0environment.bat" %0 %*
) else (
  SET "PATH=%~dp0;%PATH%"
)
ruby.exe -S -- hiera %*
EOS
      File.open(tmp_file2.path, "w") { |cw| cw.puts cwv }
      install(tmp_file2.path, File.join(target, "#{op_file}.bat"), :mode => 0755, :preserve => true, :verbose => true)

      tmp_file2.unlink
      installed_wrapper = true
    end
  end
  install(tmp_file.path, File.join(target, op_file), :mode => 0755, :preserve => true, :verbose => true)
  tmp_file.unlink
end

# Change directory into the hiera root so we don't get the wrong files for install.
cd File.dirname(__FILE__) do
  # Set these values to what you want installed.
  configs = glob(%w{ext/hiera.yaml})
  bins  = glob(%w{bin/*})
  man   = glob(%w{man/man[0-9]/*})
  libs  = glob(%w{lib/**/*.rb})

  prepare_installation

  do_configs(configs, InstallOptions.config_dir) if InstallOptions.configs
  do_bins(bins, InstallOptions.bin_dir)
  do_libs(libs)
  do_man(man) unless is_windows?
end