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134 lines
4.2 KiB
134 lines
4.2 KiB
.. _topics-configuration:
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*************
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Configuration
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*************
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Generating Commands From a File
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===============================
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The :py:class:`scripttease.parsers.ini.Config` class may instantiate commands by loading a configuration file.
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.. note::
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Additional formats such as JSON or YAML may be supported in the future.
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An example file:
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.. code-block:: ini
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[install apache]
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install: apache2
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[create the web site directory]
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mkdir: /var/www/domains/example_com/www
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recursive: yes
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[set permissions on the website directory]
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perms: /var/www/domains/example_com/www
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group: www-data
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mode: 775
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owner: www-data
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Notes regarding this format:
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- This is the standard format for Python's ConfigParser. If you prefer, you may use ``=`` instead of ``:``.
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- The first line is the INI section and is used as the default comment.
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- The command name must be the *first* option in the section.
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- The arguments for the command appear as the value of the first option in the section. Arguments are separated by a
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space.
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- Arguments that should be treated as a single value should be enclosed in double quotes.
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- ``yes`` and ``no`` are interpreted as boolean values.
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- List values, where required, are separated by commas.
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.. _topics-configuration-common-parameters:
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Common Parameters
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-----------------
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All commands support the following common parameters:
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- ``comment``: A comment regarding the command.
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- ``condition``: A condition for execution. For example, ``! -f /path/to/some/file.txt``
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- ``cd``: The path from which a command should be executed.
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- ``environments``: A string or list of strings indicating the operational environments in which the command runs. This
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is *not* used by default, but may be used to programmatically filter commands for a specific environment. For example,
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development versus live.
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- ``prefix``: A statement to be added prior to executing the command.
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- ``register``: A variable name to which the the success or failure (exit code) of the statement is captured.
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- ``shell``: The shell used to run the commands. For example, ``/bin/bash``. This is generally not important, but can
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be a problem when attempting to execute some commands (such as Django management commands).
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- ``stop``: ``True`` indicates no other commands should be executed if the given command fails.
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- ``sudo``: ``True`` indicates the command should be automatically prefixed with ``sudo``. If provided as a string, the
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command is also prefixed with a specific user name.
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- ``tags``: A list of tags used to classify the command.
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Defining an "Itemized" Command
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------------------------------
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Certain command definitions may be repeated by defining a list of items.
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Example of an "itemized" command:
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.. code-block:: ini
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[touch a bunch of files]
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touch = /var/www/domains/example_com/www/$item
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items = index.html, assets/index.html, content/index.html
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.. note::
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Command itemization may vary with the command type.
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Pre-Parsing Command Files as Templates
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======================================
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Configuration file may be pre-processed as a Jinja2 template by providing a context dictionary:
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.. code-block:: ini
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[install apache]
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install: apache
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[create the website directory]
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mkdir: /var/www/domains/{{ domain_tld }}/www
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recursive: yes
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[set permissions on the website directory]
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perms: /var/www/domains/{{ domain_tld }}/www
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group: www-data
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mode: 775
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owner: www-data
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Then with a config instance:
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.. code-block:: python
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context = {
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'domain_tld': "example_com",
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}
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config = Config("commands.ini", context=context)
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config.load()
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for command in config.get_commands():
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print(command.get_statement(cd=True))
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print("")
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Using the Tease Command
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=======================
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The ``tease`` command may be used to parse a configuration file, providing additional utilities for working with commands. See :ref:`commands`.
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The ``path`` argument defaults to ``commands.ini``.
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Loading Variables from a File
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-----------------------------
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Context variables may be loaded from a file:
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.. code-block:: ini
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[domain]
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name = example.com
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tld = example_com
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The variables above are available as ``section_key``. For example, ``domain_name`` is ``example.com``.
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