Namespaced Quattor configuration

Work In Progress

Setup: derived from SCDB.

Current setup uses namespaces.

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.