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196 lines
6.5 KiB
ReStructuredText
196 lines
6.5 KiB
ReStructuredText
.. _spm-formula:
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============
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FORMULA File
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============
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In addition to the formula itself, a ``FORMULA`` file must exist which
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describes the package. An example of this file is:
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.. code-block:: yaml
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name: apache
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os: RedHat, Debian, Ubuntu, Suse, FreeBSD
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os_family: RedHat, Debian, Suse, FreeBSD
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version: 201506
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release: 2
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summary: Formula for installing Apache
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description: Formula for installing Apache
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Required Fields
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```````````````
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This file must contain at least the following fields:
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name
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~~~~
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The name of the package, as it will appear in the package filename, in the
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repository metadata, and the package database. Even if the source formula has
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``-formula`` in its name, this name should probably not include that. For
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instance, when packaging the ``apache-formula``, the name should be set to
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``apache``.
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os
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~~
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The value of the ``os`` grain that this formula supports. This is used to
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help users know which operating systems can support this package.
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os_family
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~~~~~~~~~
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The value of the ``os_family`` grain that this formula supports. This is used to
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help users know which operating system families can support this package.
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version
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~~~~~~~
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The version of the package. While it is up to the organization that manages this
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package, it is suggested that this version is specified in a ``YYYYMM`` format.
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For instance, if this version was released in June 2015, the package version
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should be ``201506``. If multiple releases are made in a month, the ``release``
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field should be used.
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minimum_version
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~~~~~~~~~~~~~~~
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Minimum recommended version of Salt to use this formula. Not currently enforced.
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release
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~~~~~~~
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This field refers primarily to a release of a version, but also to multiple
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versions within a month. In general, if a version has been made public, and
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immediate updates need to be made to it, this field should also be updated.
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summary
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~~~~~~~
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A one-line description of the package.
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description
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~~~~~~~~~~~
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A more detailed description of the package which can contain more than one line.
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Optional Fields
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```````````````
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The following fields may also be present.
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top_level_dir
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~~~~~~~~~~~~~
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This field is optional, but highly recommended. If it is not specified, the
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package name will be used.
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Formula repositories typically do not store ``.sls`` files in the root of the
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repository; instead they are stored in a subdirectory. For instance, an
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``apache-formula`` repository would contain a directory called ``apache``, which
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would contain an ``init.sls``, plus a number of other related files. In this
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instance, the ``top_level_dir`` should be set to ``apache``.
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Files outside the ``top_level_dir``, such as ``README.rst``, ``FORMULA``, and
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``LICENSE`` will not be installed. The exceptions to this rule are files that
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are already treated specially, such as ``pillar.example`` and ``_modules/``.
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recommended
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~~~~~~~~~~~
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A list of optional packages that are recommended to be installed with the
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package. This list is displayed in an informational message
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when the package is installed to SPM.
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Building a Package
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------------------
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Once a ``FORMULA`` file has been created, it is placed into the root of the
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formula that is to be turned into a package. The ``spm build`` command is
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used to turn that formula into a package:
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.. code-block:: bash
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spm build /path/to/saltstack-formulas/apache-formula
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The resulting file will be placed in the build directory. By default this
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directory is located at ``/srv/spm/``.
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Loader Modules
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==============
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When an execution module is placed in ``<file_roots>/_modules/`` on the master,
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it will automatically be synced to minions, the next time a sync operation takes
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place. Other modules are also propagated this way: state modules can be placed
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in ``_states/``, and so on.
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When SPM detects a file in a package which resides in one of these directories,
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that directory will be placed in ``<file_roots>`` instead of in the formula
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directory with the rest of the files.
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Removing Packages
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=================
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Packages may be removed once they are installed using the ``spm remove``
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command.
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.. code-block:: bash
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spm remove apache
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If files have been modified, they will not be removed. Empty directories will
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also be removed.
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Technical Information
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=====================
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Packages are built using BZ2-compressed tarballs. By default, the package
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database is stored using the ``sqlite3`` driver (see Loader Modules below).
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Support for these are built into Python, and so no external dependencies are
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needed.
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All other files belonging to SPM use YAML, for portability and ease of use and
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maintainability.
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SPM-Specific Loader Modules
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===========================
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SPM was designed to behave like traditional package managers, which apply files
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to the filesystem and store package metadata in a local database. However,
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because modern infrastructures often extend beyond those use cases, certain
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parts of SPM have been broken out into their own set of modules.
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Package Database
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----------------
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By default, the package database is stored using the ``sqlite3`` module. This
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module was chosen because support for SQLite3 is built into Python itself.
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Please see the SPM Development Guide for information on creating new modules
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for package database management.
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Package Files
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-------------
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By default, package files are installed using the ``local`` module. This module
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applies files to the local filesystem, on the machine that the package is
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installed on.
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Please see the :ref:`SPM Development Guide <spm-development>` for information
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on creating new modules for package file management.
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Types of Packages
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=================
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SPM supports different types of formula packages. The function of each package
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is denoted by its name. For instance, packages which end in ``-formula`` are
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considered to be Salt States (the most common type of formula). Packages which
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end in ``-conf`` contain configuration which is to be placed in the
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``/etc/salt/`` directory. Packages which do not contain one of these names are
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treated as if they have a ``-formula`` name.
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formula
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-------
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By default, most files from this type of package live in the ``/srv/spm/salt/``
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directory. The exception is the ``pillar.example`` file, which will be renamed
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to ``<package_name>.sls`` and placed in the pillar directory (``/srv/spm/pillar/``
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by default).
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reactor
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-------
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By default, files from this type of package live in the ``/srv/spm/reactor/``
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directory.
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conf
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----
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The files in this type of package are configuration files for Salt, which
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normally live in the ``/etc/salt/`` directory. Configuration files for packages
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other than Salt can and should be handled with a Salt State (using a ``formula``
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type of package).
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