How to use the pybombs.utils.sysutils function in PyBOMBS

def detect_pip_exe():
    """
    Returns the path to the pip version used. Factors in the available Python
    version.
    """
    from pybombs.config_manager import config_manager
    if vcompare('>=', config_manager.get_python_version(), '3'):
        default_pip = 'pip3'
    else:
        default_pip = 'pip2'
    if sysutils.which(default_pip) is not None:
        return default_pip
    if sysutils.which('pip') is not None:
        return 'pip'
    return None

def __init__(self, logger):
        ExternPackager.__init__(self, logger)
        self.command = None
        if sysutils.which('zypper') is not None:
            self.command = 'zypper'
        if sysutils.which('rpm') is not None:
            self.fastcommand = 'rpm'
        else:
            self.fastcommand = None

def detect_pip_exe():
    """
    Returns the path to the pip version used. Factors in the available Python
    version.
    """
    from pybombs.config_manager import config_manager
    if vcompare('>=', config_manager.get_python_version(), '3'):
        default_pip = 'pip3'
    else:
        default_pip = 'pip2'
    if sysutils.which(default_pip) is not None:
        return default_pip
    if sysutils.which('pip') is not None:
        return 'pip'
    return None

def __init__(self, logger):
        ExternPackager.__init__(self, logger)
        self.command = None
        if sysutils.which('zypper') is not None:
            self.command = 'zypper'
        if sysutils.which('rpm') is not None:
            self.fastcommand = 'rpm'
        else:
            self.fastcommand = None

def supported(self):
        """
        Check if we can even run 'pkg-config'. Return True if yes.
        """
        return sysutils.which('pkg-config') is not None

def _write_env_file(self):
        """
        Create a setup_env.sh file in the prefix
        """
        prefix_recipe = get_prefix_recipe("default_prefix")
        if prefix_recipe is None:
            self.log.error("Could not find recipe for `{0}'".format(self.args.recipe))
            return False
        path = self.prefix.prefix_dir
        if not sysutils.dir_is_writable(path):
            self.log.error("Cannot write to prefix path `{0}'.".format(path))
            return -1
        try:
            for fname, content in prefix_recipe.files.items():
                sysutils.write_file_in_subdir(
                    path, fname, prefix_recipe.var_replace_all(content))
        except (PBException, OSError, IOError):
            return False
        return True

def _write_env_file(self):
        """
        Create a setup_env.sh file in the prefix
        """
        prefix_recipe = get_prefix_recipe("default_prefix")
        if prefix_recipe is None:
            self.log.error("Could not find recipe for `{0}'".format(self.args.recipe))
            return False
        path = self.prefix.prefix_dir
        if not sysutils.dir_is_writable(path):
            self.log.error("Cannot write to prefix path `{0}'.".format(path))
            return -1
        try:
            for fname, content in prefix_recipe.files.items():
                sysutils.write_file_in_subdir(
                    path, fname, prefix_recipe.var_replace_all(content))
        except (PBException, OSError, IOError):
            return False
        return True

def create_subdirs_and_files(path, dirs, files):
            " Create subdirs and files "
            sysutils.require_subdirs(path, [k for k, v in dirs.items() if v])
            for fname, content in files.items():
                sysutils.write_file_in_subdir(path, fname, prefix_recipe.var_replace_all(content))
        def register_alias(alias, path):

Stores information about the current prefix being used.
    """
    prefix_conf_dir = '.pybombs'
    src_dir_name = 'src'
    env_prefix_var = 'PYBOMBS_PREFIX'
    env_srcdir_var = 'PYBOMBS_PREFIX_SRC'
    inv_file_name = 'inventory.yml'
    setup_env_key = 'setup_env'
    default_config_info = {
        'prefix_aliases': {},
        'prefix_config_dir': {},
        'env': {},
        'recipes': {},
        'packages': {'gnuradio': {'forcebuild': True}},
        'categories': {'common': {'forcebuild': True}},
        'python_ver': sysutils.get_interpreter_version(),
    }
    default_env_unix = { # These envs are non-portable
        'PATH': "{prefix_dir}/bin:$PATH",
        'PYTHONPATH': "{python_path}:$PYTHONPATH",
        'LD_LIBRARY_PATH': "{prefix_dir}/lib:{prefix_dir}/lib64/:$LD_LIBRARY_PATH",
        'LIBRARY_PATH': "{prefix_dir}/lib:{prefix_dir}/lib64/:$LIBRARY_PATH",
        'PKG_CONFIG_PATH':
            "{prefix_dir}/lib/pkgconfig:{prefix_dir}/lib64/pkgconfig:$PKG_CONFIG_PATH",
        'GRC_BLOCKS_PATH': "{prefix_dir}/share/gnuradio/grc/blocks:$GRC_BLOCKS_PATH",
        'PYBOMBS_PREFIX': "{prefix_dir}",
    }


    def __init__(self, args, cfg_list, select_prefix=None):
        self.log = pb_logging.logger.getChild("ConfigManager.PrefixInfo")
        self.prefix_dir = None

def __init__(self, logger):
        ExternPackager.__init__(self, logger)
        self.command = None
        if sysutils.which('dnf') is not None:
            self.command = 'dnf'
        elif sysutils.which('yum') is not None:
            self.command = 'yum'