Make relationships based on a pattern

1. Overview
2. Usage

Overview

The manifold resource type allows you to make relationships on many other resources at once. The relationships are generated at the end of the catalog compilation, and they're generated based on simple pattern-matching on attributes.

You can specify any attribute to match, and you can specify either a string or a regular expression. Unfortunately, this currently only works with native types, so you can create relationships against all package resources tagged with 'internal' but you cannot do the same for all apache::vhost defined resource types.

The pattern matching works like you might expect.

• If you're matching a string parameter:
  • and you pass a string, it matches using string equality.
  • and you pass a regex, if matches against the regex.
• If you're matching an array parameter:
  • and you pass a string, it uses string equality to check for membership in that array.
  • and you pass a regex, if uses regex to check for membership in that array.
• If you invert the match, the result of the above is inverted.
  • String/regex does not match.
  • String/regex doesn't match any array members.

This supports all standard relationships: require, before, subscribe, & notify.

Usage

Example:

manifold { 'internal':
  type         => 'package',
  match        => 'tag',
  pattern      => 'internal',  # or /internal/ to use a regular expression
  relationship => before,
}
package { ['foo', 'bar', 'baz']:
  ensure  => present,
  tag     => 'internal',
}
yumrepo { 'internal':
  ensure   => 'present',
  baseurl  => 'http://yum.example.com/el/7/products/x86_64/',
  descr    => 'Local packages',
  enabled  => '1',
  before   => Manifold['internal'],
}

• invert Invert the pattern matching. Valid values are true, false.

• match The parameter name to match on

• pattern A string or regex pattern to match in combination with the match param

• query A hash of matches and patterns to use (unimplemented)

• relationship The relationship to enforce from this resource to the matched resources

• type (namevar) The type of other resource to depend upon

TODO

• Allow relationships to be set on defined types.
• Allow more complex patterns to be used, such as matching multiple patterns.

Disclaimer

I take no liability for the use of this module. It's in early stages of development.

Contact

[email protected]