def download(spec, source_uri, install_dir = Gem.dir)
if File.writable?(install_dir)
cache_dir = File.join install_dir, 'cache'
else
cache_dir = File.join(Gem.user_dir, 'cache')
end
gem_file_name = "#{spec.full_name}.gem"
local_gem_path = File.join cache_dir, gem_file_name
FileUtils.mkdir_p cache_dir rescue nil unless File.exist? cache_dir
unless URI::Generic === source_uri
source_uri = URI.parse(URI.escape(source_uri))
end
scheme = source_uri.scheme
scheme = nil if scheme =~ /^[a-z]$/i
case scheme
when 'http', 'https' then
unless File.exist? local_gem_path then
begin
say "Downloading gem #{gem_file_name}" if
Gem.configuration.really_verbose
remote_gem_path = source_uri + "gems/#{gem_file_name}"
gem = self.fetch_path remote_gem_path
rescue Gem::RemoteFetcher::FetchError
raise if spec.original_platform == spec.platform
alternate_name = "#{spec.original_name}.gem"
say "Failed, downloading gem #{alternate_name}" if
Gem.configuration.really_verbose
remote_gem_path = source_uri + "gems/#{alternate_name}"
gem = self.fetch_path remote_gem_path
end
File.open local_gem_path, 'wb' do |fp|
fp.write gem
end
end
when 'file' then
begin
path = source_uri.path
path = File.dirname(path) if File.extname(path) == '.gem'
remote_gem_path = File.join(path, 'gems', gem_file_name)
FileUtils.cp(remote_gem_path, 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
when nil then
begin
if Gem.win_platform? && source_uri.scheme && !source_uri.path.include?(':')
FileUtils.cp URI.unescape(source_uri.scheme + ':' + source_uri.path), local_gem_path
else
FileUtils.cp URI.unescape(source_uri.path), local_gem_path
end
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