buildroot

3 files changed, 17 insertions, 0 deletions

diff --git a/lib/rubygems/dependency_installer.rb b/lib/rubygems/dependency_installer.rb
index 6303e8e..71ad393 100644
--- a/lib/rubygems/dependency_installer.rb
+++ b/lib/rubygems/dependency_installer.rb
@@ -69,6 +69,7 @@ class Gem::DependencyInstaller
     @installed_gems = []
 
     @install_dir = options[:install_dir] || Gem.dir
+    @build_root = options[:build_root]
     @cache_dir = options[:cache_dir] || @install_dir
 
     # Set with any errors that SpecFetcher finds while search through
@@ -290,6 +291,7 @@ class Gem::DependencyInstaller
                                 :format_executable   => @format_executable,
                                 :ignore_dependencies => @ignore_dependencies,
                                 :install_dir         => @install_dir,
+                                :build_root          => @build_root,
                                 :security_policy     => @security_policy,
                                 :user_install        => @user_install,
                                 :wrappers            => @wrappers
diff --git a/lib/rubygems/install_update_options.rb b/lib/rubygems/install_update_options.rb
index 3ee6432..53e867c 100644
--- a/lib/rubygems/install_update_options.rb
+++ b/lib/rubygems/install_update_options.rb
@@ -44,6 +44,12 @@ module Gem::InstallUpdateOptions
       options[:bin_dir] = File.expand_path(value)
     end
 
+    add_option(:"Install/Update", '--build-root DIR',
+      'Temporary installation root. Useful for building',
+      'packages. Do not use this when installing remote gems.') do |value, options|
+      options[:build_root] = File.expand_path(value)
+    end
+
     add_option(:"Install/Update", '-d', '--[no-]rdoc',
                'Generate RDoc documentation for the gem on',
                'install') do |value, options|
diff --git a/lib/rubygems/installer.rb b/lib/rubygems/installer.rb
index 31fb120..24b9555 100644
--- a/lib/rubygems/installer.rb
+++ b/lib/rubygems/installer.rb
@@ -427,9 +427,18 @@ class Gem::Installer
     @wrappers            = options[:wrappers]
     @bin_dir             = options[:bin_dir]
     @development         = options[:development]
+    @build_root          = options[:build_root]
 
     raise "NOTE: Installer option :source_index is dead" if
       options[:source_index]
+
+    unless @build_root.nil?
+      require 'pathname'
+      @build_root = Pathname.new(@build_root).expand_path
+      @bin_dir = File.join(@build_root, options[:bin_dir] || Gem.bindir(@gem_home))
+      @gem_home = File.join(@build_root,@gem_home)
+      alert_warning "You build with buildroot.\n  Build root: #{@build_root}\n  Bin dir: #{@bin_dir}\n  Gem home: #{@gem_home}"
+    end
   end
 
   def check_that_user_bin_dir_is_in_path