Gem::Source

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.

Attributes

uri[R]

The URI this source will fetch gems from.

Public Class Methods

new(uri)

Creates a new Source which will use the index located at uri.

 
               # File rubygems/source.rb, line 29
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

Public Instance Methods

<=>(other)

Sources are ordered by installation preference.

 
               # File rubygems/source.rb, line 53
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

cache_dir(uri)

Returns the local directory to write uri to.

 
               # File rubygems/source.rb, line 111
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

download(spec, dir=Dir.pwd)

Downloads spec and writes it to dir. See also Gem::RemoteFetcher#download.

 
               # File rubygems/source.rb, line 209
def download(spec, dir=Dir.pwd)
  fetcher = Gem::RemoteFetcher.fetcher
  fetcher.download spec, api_uri.to_s, dir
end

fetch_spec(name_tuple)

Fetches a specification for the given name_tuple.

 
               # File rubygems/source.rb, line 134
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

load_specs(type)

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

 
               # File rubygems/source.rb, line 179
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

update_cache?()

Returns true when it is possible and safe to update the cache directory.

 
               # File rubygems/source.rb, line 122
def update_cache?
  @update_cache ||=
    begin
      File.stat(Gem.user_home).uid == Process.uid
    rescue Errno::ENOENT
      false
    end
end