NAME

         fai-deps - class dependencies for FAI

SYNOPSIS

         fai-deps [-h] [--man] [-d]

ABSTRACT

         implements dependencies between fai classes.

DESCRIPTION

       fai-deps uses files $FAI/class/*.deps to sort the classes in $LOGDIR/FAI_CLASSES and
       define additional ones. While doing so, it retains the original order as much as possible.

       *.deps files may contain class names, separated by whitespace. Comments ( after # or ; )
       are ignored

       e.g. you have a class WORDPRESS that depends on the classes VHOST and POSTGRES . VHOST
       again may depend on WEBSERVER.  So if you want to install the blogging software wordpress,
       you add a file

         $FAI/class/WORDPRESS.deps

       that contains the words
         VHOST
         POSTGRES

       and a file
         $FAI/class/VHOST.deps

       that contains the word
         WEBSERVER

       The order often is important, so this script is taking care of it. The order of the
       example above would be:
         WEBSERVER VHOST POSTGRES WORDPRESS

       That way, in $FAI/scripts/ first the webserver would be configured, then the vhosts, ...

       It removes double entries from FAI_CLASSES and handles circular dependencies[1].

       I do not recommend using circular dependencies, but if you accidentally define them, they
       will not break your neck. But you'll get a warning ...

ENVIROMENT

       One non-standard perl module is required:
        Graph::Directed; On debian install libgraph-perl

       The following environment variables are used:

        $LOGDIR  : path to fai temporary files
        $FAI     : path to fai config space

SEE ALSO

        https://fai-project.org

AUTHOR

        Copyright 2008 by Ingo Wichmann <iw@linuxhotel.de>

        This software ist free software; you can redistribute it and/or modify
        it unter the same terms as Perl itself.

                                            2023-01-25                                FAI-DEPS(8)