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namespace :gitlab do
  namespace :gitaly do
    desc "GitLab | Install or upgrade gitaly"
    task :install, [:dir, :repo] => :environment do |t, args|
      require 'toml'

      warn_user_is_not_gitlab
      unless args.dir.present?
        abort %(Please specify the directory where you want to install gitaly:\n  rake "gitlab:gitaly:install[/home/git/gitaly]")
      end
      args.with_defaults(repo: 'https://gitlab.com/gitlab-org/gitaly.git')

      version = Gitlab::GitalyClient.expected_server_version

      checkout_or_clone_version(version: version, repo: args.repo, target_dir: args.dir)

      _, status = Gitlab::Popen.popen(%w[which gmake])
      command = status.zero? ? 'gmake' : 'make'

      Dir.chdir(args.dir) do
        create_gitaly_configuration
        run_command!([command])
      end
    end

    desc "GitLab | Print storage configuration in TOML format"
    task storage_config: :environment do
      require 'toml'

      puts "# Gitaly storage configuration generated from #{Gitlab.config.source} on #{Time.current.to_s(:long)}"
      puts "# This is in TOML format suitable for use in Gitaly's config.toml file."

      config = Gitlab.config.repositories.storages.map do |key, val|
        { name: key, path: val['path'] }
      end

      puts TOML.dump(storage: config)
    end

    private

    # We cannot create config.toml files for all possible Gitaly configuations.
    # For instance, if Gitaly is running on another machine then it makes no
    # sense to write a config.toml file on the current machine. This method will
    # only write a config.toml file in the most common and simplest case: the
    # case where we have exactly one Gitaly process and we are sure it is
    # running locally because it uses a Unix socket.
    def create_gitaly_configuration
      storages = []
      address = nil

      Gitlab.config.repositories.storages.each do |key, val|
        if address
          if address != val['gitaly_address']
            raise ArgumentError, "Your gitlab.yml contains more than one gitaly_address."
          end
        elsif URI(val['gitaly_address']).scheme != 'unix'
          raise ArgumentError, "Automatic config.toml generation only supports 'unix:' addresses."
        else
          address = val['gitaly_address']
        end

        storages << { name: key, path: val['path'] }
      end

      File.open("config.toml", "w") do |f|
        f.puts TOML.dump(socket_path: address.sub(%r{\Aunix:}, ''), storages: storages)
      end
    rescue ArgumentError => e
      puts "Skipping config.toml generation:"
      puts e.message
    end
  end
end