code: def get_builds(galaxy_base):
      
      name = "samtools"
      galaxy_config = _get_galaxy_tool_info(galaxy_base)
      galaxy_dt = _get_galaxy_data_table(name, galaxy_config["tool_data_table_config_path"])
      loc_file, need_remap = _get_galaxy_loc_file(name, galaxy_dt, galaxy_config["tool_data_path"],
                                                  galaxy_base)
      assert not need_remap, "Should not need to remap reference files"
      fnames = {}
      for dbkey, fname in _galaxy_loc_iter(loc_file, galaxy_dt):
          fnames[dbkey] = fname
      out = []
      for dbkey in sorted(fnames.keys()):
          out.append((dbkey, fnames[dbkey]))
      return out
docs: Retrieve configured genome builds and reference files, using Galaxy configuration files.
  
      Allows multiple dbkey specifications in the same file, using the most recently added.