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require 'rubygems'
require 'rubygems/dependency_list'
require 'rubygems/installer'
require 'rubygems/source_info_cache'
require 'rubygems/user_interaction'
class Gem::DependencyInstaller
include Gem::UserInteraction
attr_reader :gems_to_install
attr_reader :installed_gems
DEFAULT_OPTIONS = {
:env_shebang => false,
:domain => :both, # HACK dup
:force => false,
:ignore_dependencies => false,
:security_policy => Gem::Security::NoSecurity, # HACK AlmostNo? Low?
:wrappers => true
}
##
# Creates a new installer instance that will install +gem_name+ using
# version requirement +version+ and +options+.
#
# Options are:
# :env_shebang:: See Gem::Installer::new.
# :domain:: :local, :remote, or :both. :local only searches gems in the
# current directory. :remote searches only gems in Gem::sources.
# :both searches both.
# :force:: See Gem::Installer#install.
# :ignore_dependencies: Don't install any dependencies.
# :install_dir: See Gem::Installer#install.
# :security_policy: See Gem::Installer::new and Gem::Security.
# :wrappers: See Gem::Installer::new
def initialize(gem_name, version = nil, options = {})
options = DEFAULT_OPTIONS.merge options
@env_shebang = options[:env_shebang]
@domain = options[:domain]
@force = options[:force]
@ignore_dependencies = options[:ignore_dependencies]
@install_dir = options[:install_dir] || Gem.dir
@security_policy = options[:security_policy]
@wrappers = options[:wrappers]
@installed_gems = []
spec_and_source = nil
local_gems = Dir["#{gem_name}*"].sort.reverse
unless local_gems.empty? then
local_gems.each do |gem_file|
next unless gem_file =~ /gem$/
begin
spec = Gem::Format.from_file_by_path(gem_file).spec
spec_and_source = [spec, gem_file]
break
rescue SystemCallError, Gem::Package::FormatError
end
end
end
if spec_and_source.nil? then
version ||= Gem::Requirement.default
@dep = Gem::Dependency.new gem_name, version
spec_and_sources = find_gems_with_sources(@dep).reverse
spec_and_source = spec_and_sources.find do |spec, source|
Gem::Platform.match spec.platform
end
end
if spec_and_source.nil? then
raise Gem::GemNotFoundException,
"could not find #{gem_name} locally or in a repository"
end
@specs_and_sources = [spec_and_source]
gather_dependencies
end
##
# Returns a list of pairs of gemspecs and source_uris that match
# Gem::Dependency +dep+ from both local (Dir.pwd) and remote (Gem.sources)
# sources. Gems are sorted with newer gems prefered over older gems, and
# local gems prefered over remote gems.
def find_gems_with_sources(dep)
gems_and_sources = []
if @domain == :both or @domain == :local then
Dir[File.join(Dir.pwd, "#{dep.name}-[0-9]*.gem")].each do |gem_file|
spec = Gem::Format.from_file_by_path(gem_file).spec
gems_and_sources << [spec, gem_file] if spec.name == dep.name
end
end
if @domain == :both or @domain == :remote then
gems_and_sources.push(*Gem::SourceInfoCache.search_with_source(dep, true))
end
gems_and_sources.sort_by do |gem, source|
[gem, source !~ /^http:\/\// ? 1 : 0] # local gems win
end
end
##
# Moves the gem +spec+ from +source_uri+ to the cache dir unless it is
# already there. If the source_uri is local the gem cache dir copy is
# always replaced.
def download(spec, source_uri)
gem_file_name = "#{spec.full_name}.gem"
local_gem_path = File.join @install_dir, 'cache', gem_file_name
Gem.ensure_gem_subdirectories @install_dir
source_uri = URI.parse source_uri unless URI::Generic === source_uri
scheme = source_uri.scheme
# URI.parse gets confused by MS Windows paths with forward slashes.
scheme = nil if scheme =~ /^[a-z]$/i
case scheme
when 'http' then
unless File.exist? local_gem_path then
say "Downloading gem #{gem_file_name}" if
Gem.configuration.really_verbose
remote_gem_path = source_uri + "gems/#{gem_file_name}"
gem = Gem::RemoteFetcher.fetcher.fetch_path remote_gem_path
File.open local_gem_path, 'wb' do |fp|
fp.write gem
end
end
when nil, 'file' then # TODO test for local overriding cache
begin
FileUtils.cp source_uri.to_s, local_gem_path
rescue Errno::EACCES
local_gem_path = source_uri.to_s
end
say "Using local gem #{local_gem_path}" if
Gem.configuration.really_verbose
else
raise Gem::InstallError, "unsupported URI scheme #{source_uri.scheme}"
end
local_gem_path
end
##
# Gathers all dependencies necessary for the installation from local and
# remote sources unless the ignore_dependencies was given.
def gather_dependencies
specs = @specs_and_sources.map { |spec,_| spec }
dependency_list = Gem::DependencyList.new
dependency_list.add(*specs)
unless @ignore_dependencies then
to_do = specs.dup
seen = {}
until to_do.empty? do
spec = to_do.shift
next if spec.nil? or seen[spec.name]
seen[spec.name] = true
spec.dependencies.each do |dep|
results = find_gems_with_sources(dep).reverse # local gems first
results.each do |dep_spec, source_uri|
next if seen[dep_spec.name]
@specs_and_sources << [dep_spec, source_uri]
dependency_list.add dep_spec
to_do.push dep_spec
end
end
end
end
@gems_to_install = dependency_list.dependency_order.reverse
end
##
# Installs the gem and all its dependencies.
def install
spec_dir = File.join @install_dir, 'specifications'
source_index = Gem::SourceIndex.from_gems_in spec_dir
@gems_to_install.each do |spec|
last = spec == @gems_to_install.last
# HACK is this test for full_name acceptable?
next if source_index.any? { |n,_| n == spec.full_name } and not last
say "Installing gem #{spec.full_name}" if Gem.configuration.really_verbose
_, source_uri = @specs_and_sources.assoc spec
local_gem_path = download spec, source_uri
inst = Gem::Installer.new local_gem_path,
:env_shebang => @env_shebang,
:force => @force,
:ignore_dependencies => @ignore_dependencies,
:install_dir => @install_dir,
:security_policy => @security_policy,
:wrappers => @wrappers
spec = inst.install
@installed_gems << spec
end
end
end
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