fai-deps - class dependencies for FAI
fai-deps [-h] [--man] [-d]
implements dependencies between fai classes.
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 ...
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
https://fai-project.org
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.