Namespaced Quattor configuration

Work In Progress

Setup

Derived from SCDB.

Templates Current setup uses namespaces.

Description of namespace hierarchy.

Namespaces

Quattor release 1.3 uses the concept of namespaces for organizing templates. The name of template in a namespace corresponds to its parent directory (or directories) that contain it with respect to the include root. An example: assume the include root for the Pan compiler is $I, then a template with path $I/my/namespaced/template.tpl should have the name my/namespaced/template in Pan:

template my/namespaced/template;

# contents

Combining namespaced templates with the Pan feature called loadpath gives tremendous flexibility in defining various template tree parallel to each other with the possibility to select from a template which of the trees to use for compilation. The loadpath is set by built-in Pan variable LOADPATH, which is a list strings to consider to resolve a requested template.

A concrete example is the selection of the operating system. Assume the file system hierarchy under the include root $I is as follows:

$I
   +- centos3_i386
      +- some
         +- template
   +- centos4_i386
      +- some
         +- template

Then it is possible to

include some/template;

from other templates if either centos3_i386 or centos4_i386 was added to the Pan variable LOADPATH.