alternate_search

alternate_search is a chef cookbook that provides an alternate search syntax (and several utility functions) that make using Chef search easier. By default, searches are restricted to the current environment, and make use of partial_search so that searches use a minimum of resources.

Requirements

Uses the partial_search cookbook.

Usage

Depend on this cookbook in your cookbooks metadata.rb:

depends 'alternate_search'

The below functions can the be used in recipes and template resources.

Functions

All of the node search functions restrict searches to the current chef_environment. If you need to search across all environments, use :chef_environment => *.

search_to_string

search_to_string(:recipe => 'chef-client', :chef_environment => 'staging')
=> "recipe:chef-client AND chef_environment:staging"

search_nodes

Equivalent to partial_search, with :chef_environment set to node.chef_environment by default.

search_nodes(:recipe => 'chef-server')

Options for partial_search can be passed as a second parameter:

search_nodes({:recipe => 'chef-server'}, {:keys => {"fqdn" => ['fqdn']}})

search_fqdns

Does a partial search, only fetching the FQDNs of matching nodes.

search_fqdns(:recipe => 'webserver')
=> ['one.example.com', 'two.example.com']

search_fqdn

Returns the FQDN of the single matching node, raising an error if zero or multiple nodes match:

search_fqdn(:role => 'graphite')
=> 'graphite.example.com'

Examples

Searching from a recipe:

# A single FQDN, raising an error if no nodes or multiple nodes are found
chef_server_host = search_fqdn(:recipe => 'chef-server')

# A list of FQDNs matching nodes with the 'postgres' recipe
database_hosts = search_fqdns(:recipe => 'postgres')

# A list of nodes with the 'webserver' role
webservers = search_nodes(:role => 'webserver')

Searching from a template resource:

template "/tmp/test" do
    variables({
        :database_servers => search_fqdns(:role => 'my_database_role')
    })
end

Licence

Copyright (c) 2014 Sam Clements

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.

Authors

• Sam Clements