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===============

 Configuration

===============

Configurable settings of the :class:`dnf.Base` object are stored into a :class:`dnf.conf.Conf` instance. The various options are described here.

.. class:: dnf.conf.Conf

    This object has attributes corresponding to all configuration options from both :ref:`"[main] Options" <conf_main_options-label>` and :ref:`"Options for both [main] and Repo" <conf_main_and_repo_options-label>` sections. For example setting a proxy to access all repositories::

        import dnf

        base = dnf.Base()

        conf = base.conf

        conf.proxy = "http://the.proxy.url:3128"

        conf.proxy_username = "username"

        conf.proxy_password = "secret"

        base.read_all_repos()

        base.fill_sack()

  .. attribute:: get_reposdir

    Returns the value of the first valid reposdir or if unavailable the value of created reposdir (string)

  .. attribute:: substitutions

    An instance of :class:`dnf.conf.substitutions.Substitutions` class. A mapping of substitutions used in repositories' remote URL configuration. The commonly used ones are:

    ==========     ============================================== ============

    key            meaning                                        default

    ==========     ============================================== ============

    arch           architecture of the machine                    autodetected

    basearch       the architecture family of the current "arch"  autodetected

    releasever     release name of the system distribution        ``None``

    ==========     ============================================== ============

    :func:`dnf.rpm.detect_releasever` can be used to detect the ``releasever`` value.

    Following example shows recommended method how to override autodetected architectures::

        import dnf

        import hawkey

        arch = hawkey.detect_arch()

        base = dnf.Base()

        base.conf.substitutions['arch'] = arch

        base.conf.substitutions['basearch'] = dnf.rpm.basearch(arch)

        base.fill_sack()

        ...

  .. method:: exclude_pkgs(pkgs)

    Exclude all packages in the `pkgs` list from all operations.

  .. method:: prepend_installroot(option)

    Prefix config option named `option` with :attr:`installroot`.

  .. method:: read(filename=None)

    Read configuration options from the ``main`` section in `filename`. Option values not present there are left at their current values. If `filename` is ``None``, :attr:`config_file_path` is used. Conversely, the configuration path used to load the configuration file that was used is stored into :attr:`config_file_path` before the function returns.

  .. method:: dump()

    Print configuration values, including inherited values.

  .. method:: write_raw_configfile(filename, section_id, substitutions, modify)

    Update or create config file. Where `filename` represents name of config file (.conf or .repo); `section_id`

    represents id of modified section (e.g. main, fedora, updates); `substitutions` represents an instance of

    base.conf.substitutions; `modify` represents dict of modified options.

.. class:: dnf.conf.substitutions.Substitutions

  .. method:: update_from_etc(installroot, varsdir=("/etc/yum/vars/", "/etc/dnf/vars/"))

    Read user-defined variables values from variable directories. See :ref:`variable files <varfiles-label>` in Configuration reference.