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require 'uri'
require 'fileutils'
##
# A Source knows how to list and fetch gems from a RubyGems marshal index.
#
# There are other Source subclasses for installed gems, local gems, the
# bundler dependency API and so-forth.
class Gem::Source
include Comparable
FILES = { # :nodoc:
:released => 'specs',
:latest => 'latest_specs',
:prerelease => 'prerelease_specs',
}
##
# The URI this source will fetch gems from.
attr_reader :uri
##
# Creates a new Source which will use the index located at +uri+.
def initialize(uri)
begin
unless uri.kind_of? URI
uri = URI.parse(uri.to_s)
end
rescue URI::InvalidURIError
raise if Gem::Source == self.class
end
@uri = uri
@api_uri = nil
end
##
# Use an SRV record on the host to look up the true endpoint for the index.
def api_uri # :nodoc:
require 'rubygems/remote_fetcher'
@api_uri ||= Gem::RemoteFetcher.fetcher.api_endpoint uri
end
##
# Sources are ordered by installation preference.
def <=>(other)
case other
when Gem::Source::Installed,
Gem::Source::Local,
Gem::Source::Lock,
Gem::Source::SpecificFile,
Gem::Source::Git,
Gem::Source::Vendor then
-1
when Gem::Source then
if !@uri
return 0 unless other.uri
return 1
end
return -1 if !other.uri
@uri.to_s <=> other.uri.to_s
else
nil
end
end
def == other # :nodoc:
self.class === other and @uri == other.uri
end
alias_method :eql?, :== # :nodoc:
##
# Returns a Set that can fetch specifications from this source.
def dependency_resolver_set # :nodoc:
return Gem::Resolver::IndexSet.new self if 'file' == api_uri.scheme
bundler_api_uri = api_uri + './api/v1/dependencies'
begin
fetcher = Gem::RemoteFetcher.fetcher
response = fetcher.fetch_path bundler_api_uri, nil, true
rescue Gem::RemoteFetcher::FetchError
Gem::Resolver::IndexSet.new self
else
if response.respond_to? :uri then
Gem::Resolver::APISet.new response.uri
else
Gem::Resolver::APISet.new bundler_api_uri
end
end
end
def hash # :nodoc:
@uri.hash
end
##
# Returns the local directory to write +uri+ to.
def cache_dir(uri)
# Correct for windows paths
escaped_path = uri.path.sub(/^\/([a-z]):\//i, '/\\1-/')
escaped_path.untaint
File.join Gem.spec_cache_dir, "#{uri.host}%#{uri.port}", File.dirname(escaped_path)
end
##
# Returns true when it is possible and safe to update the cache directory.
def update_cache?
@update_cache ||=
begin
File.stat(Gem.user_home).uid == Process.uid
rescue Errno::ENOENT
false
end
end
##
# Fetches a specification for the given +name_tuple+.
def fetch_spec name_tuple
fetcher = Gem::RemoteFetcher.fetcher
spec_file_name = name_tuple.spec_name
uri = api_uri + "#{Gem::MARSHAL_SPEC_DIR}#{spec_file_name}"
cache_dir = cache_dir uri
local_spec = File.join cache_dir, spec_file_name
if File.exist? local_spec then
spec = Gem.read_binary local_spec
spec = Marshal.load(spec) rescue nil
return spec if spec
end
uri.path << '.rz'
spec = fetcher.fetch_path uri
spec = Gem.inflate spec
if update_cache? then
FileUtils.mkdir_p cache_dir
open local_spec, 'wb' do |io|
io.write spec
end
end
# TODO: Investigate setting Gem::Specification#loaded_from to a URI
Marshal.load spec
end
##
# Loads +type+ kind of specs fetching from +@uri+ if the on-disk cache is
# out of date.
#
# +type+ is one of the following:
#
# :released => Return the list of all released specs
# :latest => Return the list of only the highest version of each gem
# :prerelease => Return the list of all prerelease only specs
#
def load_specs(type)
file = FILES[type]
fetcher = Gem::RemoteFetcher.fetcher
file_name = "#{file}.#{Gem.marshal_version}"
spec_path = api_uri + "#{file_name}.gz"
cache_dir = cache_dir spec_path
local_file = File.join(cache_dir, file_name)
retried = false
FileUtils.mkdir_p cache_dir if update_cache?
spec_dump = fetcher.cache_update_path spec_path, local_file, update_cache?
begin
Gem::NameTuple.from_list Marshal.load(spec_dump)
rescue ArgumentError
if update_cache? && !retried
FileUtils.rm local_file
retried = true
retry
else
raise Gem::Exception.new("Invalid spec cache file in #{local_file}")
end
end
end
##
# Downloads +spec+ and writes it to +dir+. See also
# Gem::RemoteFetcher#download.
def download(spec, dir=Dir.pwd)
fetcher = Gem::RemoteFetcher.fetcher
fetcher.download spec, api_uri.to_s, dir
end
def pretty_print q # :nodoc:
q.group 2, '[Remote:', ']' do
q.breakable
q.text @uri.to_s
if api = api_uri
q.breakable
q.text 'API URI: '
q.text api.to_s
end
end
end
end
require 'rubygems/source/git'
require 'rubygems/source/installed'
require 'rubygems/source/specific_file'
require 'rubygems/source/local'
require 'rubygems/source/lock'
require 'rubygems/source/vendor'
|
