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Diffstat (limited to 'lib/bundler/plugin/api/source.rb')
| -rw-r--r-- | lib/bundler/plugin/api/source.rb | 299 |
1 files changed, 299 insertions, 0 deletions
diff --git a/lib/bundler/plugin/api/source.rb b/lib/bundler/plugin/api/source.rb new file mode 100644 index 0000000000..5d3f58df92 --- /dev/null +++ b/lib/bundler/plugin/api/source.rb @@ -0,0 +1,299 @@ +# frozen_string_literal: true +require "uri" +require "digest/sha1" + +module Bundler + module Plugin + class API + # This class provides the base to build source plugins + # All the method here are required to build a source plugin (except + # `uri_hash`, `gem_install_dir`; they are helpers). + # + # Defaults for methods, where ever possible are provided which is + # expected to work. But, all source plugins have to override + # `fetch_gemspec_files` and `install`. Defaults are also not provided for + # `remote!`, `cache!` and `unlock!`. + # + # The defaults shall work for most situations but nevertheless they can + # be (preferably should be) overridden as per the plugins' needs safely + # (as long as they behave as expected). + # On overriding `initialize` you should call super first. + # + # If required plugin should override `hash`, `==` and `eql?` methods to be + # able to match objects representing same sources, but may be created in + # different situation (like form gemfile and lockfile). The default ones + # checks only for class and uri, but elaborate source plugins may need + # more comparisons (e.g. git checking on branch or tag). + # + # @!attribute [r] uri + # @return [String] the remote specified with `source` block in Gemfile + # + # @!attribute [r] options + # @return [String] options passed during initialization (either from + # lockfile or Gemfile) + # + # @!attribute [r] name + # @return [String] name that can be used to uniquely identify a source + # + # @!attribute [rw] dependency_names + # @return [Array<String>] Names of dependencies that the source should + # try to resolve. It is not necessary to use this list intenally. This + # is present to be compatible with `Definition` and is used by + # rubygems source. + module Source + attr_reader :uri, :options, :name + attr_accessor :dependency_names + + def initialize(opts) + @options = opts + @dependency_names = [] + @uri = opts["uri"] + @type = opts["type"] + @name = opts["name"] || "#{@type} at #{@uri}" + end + + # This is used by the default `spec` method to constructs the + # Specification objects for the gems and versions that can be installed + # by this source plugin. + # + # Note: If the spec method is overridden, this function is not necessary + # + # @return [Array<String>] paths of the gemspec files for gems that can + # be installed + def fetch_gemspec_files + [] + end + + # Options to be saved in the lockfile so that the source plugin is able + # to check out same version of gem later. + # + # There options are passed when the source plugin is created from the + # lock file. + # + # @return [Hash] + def options_to_lock + {} + end + + # Install the gem specified by the spec at appropriate path. + # `install_path` provides a sufficient default, if the source can only + # satisfy one gem, but is not binding. + # + # @return [String] post installation message (if any) + def install(spec, opts) + raise MalformattedPlugin, "Source plugins need to override the install method." + end + + # It builds extensions, generates bins and installs them for the spec + # provided. + # + # It depends on `spec.loaded_from` to get full_gem_path. The source + # plugins should set that. + # + # It should be called in `install` after the plugin is done placing the + # gem at correct install location. + # + # It also runs Gem hooks `pre_install`, `post_build` and `post_install` + # + # Note: Do not override if you don't know what you are doing. + def post_install(spec, disable_exts = false) + opts = { :env_shebang => false, :disable_extensions => disable_exts } + installer = Bundler::Source::Path::Installer.new(spec, opts) + installer.post_install + end + + # A default installation path to install a single gem. If the source + # servers multiple gems, it's not of much use and the source should one + # of its own. + def install_path + @install_path ||= + begin + base_name = File.basename(URI.parse(uri).normalize.path) + + gem_install_dir.join("#{base_name}-#{uri_hash[0..11]}") + end + end + + # Parses the gemspec files to find the specs for the gems that can be + # satisfied by the source. + # + # Few important points to keep in mind: + # - If the gems are not installed then it shall return specs for all + # the gems it can satisfy + # - If gem is installed (that is to be detected by the plugin itself) + # then it shall return at least the specs that are installed. + # - The `loaded_from` for each of the specs shall be correct (it is + # used to find the load path) + # + # @return [Bundler::Index] index containing the specs + def specs + files = fetch_gemspec_files + + Bundler::Index.build do |index| + files.each do |file| + next unless spec = Bundler.load_gemspec(file) + Bundler.rubygems.set_installed_by_version(spec) + + spec.source = self + Bundler.rubygems.validate(spec) + + index << spec + end + end + end + + # Set internal representation to fetch the gems/specs from remote. + # + # When this is called, the source should try to fetch the specs and + # install from remote path. + def remote! + end + + # Set internal representation to fetch the gems/specs from app cache. + # + # When this is called, the source should try to fetch the specs and + # install from the path provided by `app_cache_path`. + def cached! + end + + # This is called to update the spec and installation. + # + # If the source plugin is loaded from lockfile or otherwise, it shall + # refresh the cache/specs (e.g. git sources can make a fresh clone). + def unlock! + end + + # Name of directory where plugin the is expected to cache the gems when + # #cache is called. + # + # Also this name is matched against the directories in cache for pruning + # + # This is used by `app_cache_path` + def app_cache_dirname + base_name = File.basename(URI.parse(uri).normalize.path) + "#{base_name}-#{uri_hash}" + end + + # This method is called while caching to save copy of the gems that the + # source can resolve to path provided by `app_cache_app`so that they can + # be reinstalled from the cache without querying the remote (i.e. an + # alternative to remote) + # + # This is stored with the app and source plugins should try to provide + # specs and install only from this cache when `cached!` is called. + # + # This cache is different from the internal caching that can be done + # at sub paths of `cache_path` (from API). This can be though as caching + # by bundler. + def cache(spec, custom_path = nil) + new_cache_path = app_cache_path(custom_path) + + FileUtils.rm_rf(new_cache_path) + FileUtils.cp_r(install_path, new_cache_path) + FileUtils.touch(app_cache_path.join(".bundlecache")) + end + + # This shall check if two source object represent the same source. + # + # The comparison shall take place only on the attribute that can be + # inferred from the options passed from Gemfile and not on attibutes + # that are used to pin down the gem to specific version (e.g. Git + # sources should compare on branch and tag but not on commit hash) + # + # The sources objects are constructed from Gemfile as well as from + # lockfile. To converge the sources, it is necessary that they match. + # + # The same applies for `eql?` and `hash` + def ==(other) + other.is_a?(self.class) && uri == other.uri + end + + # When overriding `eql?` please preserve the behaviour as mentioned in + # docstring for `==` method. + alias_method :eql?, :== + + # When overriding `hash` please preserve the behaviour as mentioned in + # docstring for `==` method, i.e. two methods equal by above comparison + # should have same hash. + def hash + [self.class, uri].hash + end + + # A helper method, not necessary if not used internally. + def installed? + File.directory?(install_path) + end + + # The full path where the plugin should cache the gem so that it can be + # installed latter. + # + # Note: Do not override if you don't know what you are doing. + def app_cache_path(custom_path = nil) + @app_cache_path ||= Bundler.app_cache(custom_path).join(app_cache_dirname) + end + + # Used by definition. + # + # Note: Do not override if you don't know what you are doing. + def unmet_deps + specs.unmet_dependency_names + end + + # Note: Do not override if you don't know what you are doing. + def can_lock?(spec) + spec.source == self + end + + # Generates the content to be entered into the lockfile. + # Saves type and remote and also calls to `options_to_lock`. + # + # Plugin should use `options_to_lock` to save information in lockfile + # and not override this. + # + # Note: Do not override if you don't know what you are doing. + def to_lock + out = String.new("#{LockfileParser::PLUGIN}\n") + out << " remote: #{@uri}\n" + out << " type: #{@type}\n" + options_to_lock.each do |opt, value| + out << " #{opt}: #{value}\n" + end + out << " specs:\n" + end + + def to_s + "plugin source for #{options[:type]} with uri #{uri}" + end + + # Note: Do not override if you don't know what you are doing. + def include?(other) + other == self + end + + def uri_hash + Digest::SHA1.hexdigest(uri) + end + + # Note: Do not override if you don't know what you are doing. + def gem_install_dir + Bundler.install_path + end + + # It is used to obtain the full_gem_path. + # + # spec's loaded_from path is expanded against this to get full_gem_path + # + # Note: Do not override if you don't know what you are doing. + def root + Bundler.root + end + + # @private + # Returns true + def bundler_plugin_api_source? + true + end + end + end + end +end |