From 477c0fc85218cba12597cf3daf7728b127b0fd64 Mon Sep 17 00:00:00 2001 From: Sol Jerome Date: Wed, 8 Dec 2010 19:43:54 -0600 Subject: doc: Finish merging remaining documentation updates Signed-off-by: Sol Jerome --- doc/development/server.txt | 83 ---------------------------------------------- 1 file changed, 83 deletions(-) delete mode 100644 doc/development/server.txt (limited to 'doc/development/server.txt') diff --git a/doc/development/server.txt b/doc/development/server.txt deleted file mode 100644 index 0f594422e..000000000 --- a/doc/development/server.txt +++ /dev/null @@ -1,83 +0,0 @@ -.. -*- mode: rst -*- - -.. _development-server-plugins: - -Writing Server Plugins ----------------------- - -Metadata -^^^^^^^^ - -If you would like to define your own Metadata plugin (to extend/change -functionality of the existing Metadata plugin), here are the steps to -do so. We will call our new plugin `MyMetadata`. - -#. Add MyMetadata.py - - .. code-block:: python - - __revision__ = '$Revision$' - - import Bcfg2.Server.Plugins.Metadata - - class MyMetadata(Bcfg2.Server.Plugins.Metadata.Metadata): - '''This class contains data for bcfg2 server metadata''' - __version__ = '$Id$' - __author__ = 'bcfg-dev@mcs.anl.gov' - - def __init__(self, core, datastore, watch_clients=True): - Bcfg2.Server.Plugins.Metadata.Metadata.__init__(self, core, datastore, watch_clients) - -#. Add MyMetadata to ``src/lib/Server/Plugins/__init__.py`` -#. Replace Metadata with MyMetadata in the plugins line of bcfg2.conf - -.. _development-server-packages: - -Packages --------- - -In order to support a given client package tool driver, that driver -must support use of the auto value for the version attribute in Package -entries. In this case, the tool driver views the current state of -available packages, and uses the underlying package manager's choice of -correct package version in lieu of an explicit, centrally-specified, -version. This support enables Packages to provide a list of Package -entries with version='auto'. Currently, the APT and YUMng drivers support -this feature. Note that package management systems without any network -support cannot operate in this fashion, so RPMng and SYSV will never be -able to use Packages. Emerge, Zypper, IPS, and Blastwave all have the -needed features to be supported by Packages, but support has not yet -been written. - -Packages fills two major functions in configuration generation. The first -is to provide entry level binding support for Package entries included -in client configurations. This function is quite easy to implement; -Packages determines (based on client group membership) if the package -is available for the client system, and which type it has. Because -version='auto' is used, no version determination needs to be done. - -The second major function is more complex. Packages ensures that client -configurations include all package-level prerequisites for package entries -explicitly included in the configuration. In order to support this, -Packages needs to directly process network data for package management -systems (the network sources for apt or yum, for examples), process -these files, and build data structures describing prerequisites and the -providers of those functions/paths. To simplify implementations of this, -there is a generic base class (Bcfg2.Server.Plugins.Packages.Source) -that provides a framework for fetching network data via HTTP, processing -those sources (with subclass defined methods for processing the specific -format provided by the tool), a generic dependency resolution method, -and a caching mechanism that greatly speeds up server/bcfg2-info startup. - -Each source type must define: - -* a get_urls attribute (and associated urls property) that describes - the URLS where to get data from. -* a read_files method that reads and processes the downloaded files - -Sources may define a get_provides method, if provides are complex. For -example, provides in rpm can be either rpm names or file paths, so -multiple data sources need to be multiplexed. - -The APT source in ``src/lib/Server/Plugins/Packages.py`` provides a -relatively simple implementation of a source. -- cgit v1.2.3-1-g7c22