# Buggy code
def set_(key, value, setting=None, conf_file=_DEFAULT_CONF):
    """
    Set a new value for a specific configuration line.

    :param str key: The command or block to configure.
    :param str value: The command value or command of the block specified by the key parameter.
    :param str setting: The command value for the command specified by the value parameter.
    :param str conf_file: The logrotate configuration file.

    :return: A boolean representing whether all changes succeeded.
    :rtype: bool

    CLI Example:

    .. code-block:: bash

        salt '*' logrotate.set rotate 2

    Can also be used to set a single value inside a multiline configuration
    block. For instance, to change rotate in the following block:

    .. code-block:: text

        /var/log/wtmp {
            monthly
            create 0664 root root
            rotate 1
        }

    Use the following command:

    .. code-block:: bash

        salt '*' logrotate.set /var/log/wtmp rotate 2

    This module also has the ability to scan files inside an include directory,
    and make changes in the appropriate file.
    """
    conf = _parse_conf(conf_file)
    for include in conf["include files"]:
        if key in conf["include files"][include]:
            conf_file = os.path.join(conf["include"], include)

    new_line = six.text_type()
    kwargs = {
        "flags": 8,
        "backup": False,
        "path": conf_file,
        "pattern": "^{0}.*".format(key),
        "show_changes": False,
    }

    if setting is None:
        current_value = conf.get(key, False)

        if isinstance(current_value, dict):
            error_msg = (
                "Error: {0} includes a dict, and a specific setting inside the "
                "dict was not declared"
            ).format(key)
            raise SaltInvocationError(error_msg)

        if value == current_value:
            _LOG.debug("Command '%s' already has: %s", key, value)
            return True

        # This is the new config line that will be set
        if value is True:
            new_line = key
        elif value:
            new_line = "{0} {1}".format(key, value)

        kwargs.update({"prepend_if_not_found": True})
    else:
        stanza = conf.get(key, dict())

        if stanza and not isinstance(stanza, dict):
            error_msg = (
                "Error: A setting for a dict was declared, but the "
                "configuration line given is not a dict"
            )
            raise SaltInvocationError(error_msg)

        if setting == stanza.get(value, False):
            _LOG.debug("Command '%s' already has: %s", value, setting)
            return True

        # We're going to be rewriting an entire stanza
        if setting:
            stanza[value] = setting
        else:
            del stanza[value]

        new_line = _dict_to_stanza(key, stanza)

        kwargs.update(
            {
                "pattern": "^{0}.*?{{.*?}}".format(key),
                "flags": 24,
                "append_if_not_found": True,
            }
        )

    kwargs.update({"repl": new_line})
    _LOG.debug("Setting file '%s' line: %s", conf_file, new_line)

    return __salt__["file.replace"](**kwargs)


# Traceback (FileNotFoundError)
salt-apply:341]           ID: logrotate_config
[salt-apply:342]     Function: logrotate.set
[salt-apply:343]       Result: False
[salt-apply:344]      Comment: An exception occurred in this state: Traceback (most recent call last):
[salt-apply:345]                 File "/root/.local/lib/python3.6/site-packages/salt/state.py", line 1933, in call
[salt-apply:346]                   **cdata['kwargs'])
[salt-apply:347]                 File "/root/.local/lib/python3.6/site-packages/salt/loader.py", line 1939, in wrapper
[salt-apply:348]                   return f(*args, **kwargs)
[salt-apply:349]                 File "/root/.local/lib/python3.6/site-packages/salt/states/logrotate.py", line 87, in set_
[salt-apply:350]                   current_value = __salt__['logrotate.get'](key=key, conf_file=conf_file)
[salt-apply:351]                 File "/root/.local/lib/python3.6/site-packages/salt/modules/logrotate.py", line 163, in get
[salt-apply:352]                   current_conf = _parse_conf(conf_file)
[salt-apply:353]                 File "/root/.local/lib/python3.6/site-packages/salt/modules/logrotate.py", line 72, in _parse_conf
[salt-apply:354]                   with salt.utils.files.fopen(conf_file, 'r') as ifile:
[salt-apply:355]                 File "/root/.local/lib/python3.6/site-packages/salt/utils/files.py", line 399, in fopen
[salt-apply:356]                   f_handle = open(*args, **kwargs)  # pylint: disable=resource-leakage
[salt-apply:357]               FileNotFoundError: [Errno 2] No such file or directory: '/etc/logrotate.d/defaults'
[salt-apply:358]      Started: 19:26:45.652859
[salt-apply:359]     Duration: 0.858 ms

# Fixed code
def set_(key, value, setting=None, conf_file=_DEFAULT_CONF):
    """
    Set a new value for a specific configuration line.

    :param str key: The command or block to configure.
    :param str value: The command value or command of the block specified by the key parameter.
    :param str setting: The command value for the command specified by the value parameter.
    :param str conf_file: The logrotate configuration file.

    :return: A boolean representing whether all changes succeeded.
    :rtype: bool

    CLI Example:

    .. code-block:: bash

        salt '*' logrotate.set rotate 2

    Can also be used to set a single value inside a multiline configuration
    block. For instance, to change rotate in the following block:

    .. code-block:: text

        /var/log/wtmp {
            monthly
            create 0664 root root
            rotate 1
        }

    Use the following command:

    .. code-block:: bash

        salt '*' logrotate.set /var/log/wtmp rotate 2

    This module also has the ability to scan files inside an include directory,
    and make changes in the appropriate file.
    """
    conf = _parse_conf(conf_file)
    for include in conf.setdefault("include files", {}):
        if key in conf["include files"][include]:
            conf_file = os.path.join(conf["include"], include)

    new_line = six.text_type()
    kwargs = {
        "flags": 8,
        "backup": False,
        "path": conf_file,
        "pattern": "^{0}.*".format(key),
        "show_changes": False,
    }

    if setting is None:
        current_value = conf.get(key, False)

        if isinstance(current_value, dict):
            error_msg = (
                "Error: {0} includes a dict, and a specific setting inside the "
                "dict was not declared"
            ).format(key)
            raise SaltInvocationError(error_msg)

        if value == current_value:
            _LOG.debug("Command '%s' already has: %s", key, value)
            return True

        # This is the new config line that will be set
        if value is True:
            new_line = key
        elif value:
            new_line = "{0} {1}".format(key, value)

        kwargs.update({"prepend_if_not_found": True})
    else:
        stanza = conf.get(key, dict())

        if stanza and not isinstance(stanza, dict):
            error_msg = (
                "Error: A setting for a dict was declared, but the "
                "configuration line given is not a dict"
            )
            raise SaltInvocationError(error_msg)

        if setting == stanza.get(value, False):
            _LOG.debug("Command '%s' already has: %s", value, setting)
            return True

        # We're going to be rewriting an entire stanza
        if setting:
            stanza[value] = setting
        else:
            del stanza[value]

        new_line = _dict_to_stanza(key, stanza)

        kwargs.update(
            {
                "pattern": "^{0}.*?{{.*?}}".format(key),
                "flags": 24,
                "append_if_not_found": True,
            }
        )

    kwargs.update({"repl": new_line})
    _LOG.debug("Setting file '%s' line: %s", conf_file, new_line)

    return __salt__["file.replace"](**kwargs)