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.\" ========================================================================
.\"
.IX Title "FAI-DEPS 8"
.TH FAI-DEPS 8 "2021-05-22" "" ""
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.SH "NAME"
.Vb 1
\&  fai\-deps \- class dependencies for FAI
.Ve
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&  fai\-deps [\-h] [\-\-man] [\-d]
.Ve
.SH "ABSTRACT"
.IX Header "ABSTRACT"
.Vb 1
\&  implements dependencies between fai classes.
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
fai-deps uses files \f(CW$FAI\fR/class/*.deps to sort the classes in \f(CW$LOGDIR\fR/FAI_CLASSES and define additional ones. While doing so, it retains the original order as much as possible.
.PP
*.deps files may contain class names, separated by whitespace. Comments ( after # or ; ) are ignored
.PP
e.g. you have a class \s-1WORDPRESS\s0 that depends on the classes \s-1VHOST\s0 and \s-1POSTGRES . VHOST\s0 again may depend on \s-1WEBSERVER.\s0
So if you want to install the blogging software wordpress, you add a file
.PP
.Vb 1
\&  $FAI/class/WORDPRESS.deps
.Ve
.PP
that contains the words
  \s-1VHOST\s0
  \s-1POSTGRES\s0
.PP
and a file
  \f(CW$FAI\fR/class/VHOST.deps
.PP
that contains the word
  \s-1WEBSERVER\s0
.PP
The order often is important, so this script is taking care of it. The order of the example above would be:
  \s-1WEBSERVER VHOST POSTGRES WORDPRESS\s0
.PP
That way, in \f(CW$FAI\fR/scripts/ first the webserver would be configured, then the vhosts, ...
.PP
It removes double entries from \s-1FAI_CLASSES\s0 and handles circular dependencies[1].
.PP
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 ...
.SH "ENVIROMENT"
.IX Header "ENVIROMENT"
One non-standard perl module is required:
 Graph::Directed;
On debian install libgraph-perl
.PP
The following environment variables are used:
.PP
.Vb 2
\& $LOGDIR  : path to fai temporary files
\& $FAI     : path to fai config space
.Ve
.SH "SEE ALSO"
.IX Header "SEE ALSO"
.Vb 1
\& https://fai\-project.org
.Ve
.SH "AUTHOR"
.IX Header "AUTHOR"
.Vb 1
\& 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.
.Ve