# File lib/gitlab_git/commit.rb, line 139
      def initialize(raw_commit, head = nil)
        raise "Nil as raw commit passed" unless raw_commit

        if raw_commit.is_a?(Hash)
          init_from_hash(raw_commit)
        elsif raw_commit.is_a?(Rugged::Commit)
          init_from_rugged(raw_commit)
        else
          raise "Invalid raw commit type: #{raw_commit.class}"
        end

        @head = head
      end