Beaker snippet: acquiring a GitLab 10.4+ oauth token using only the API + user creds

puppet_beaker__gitlab_oauth_token__snippet.rb

# Here is an example of how to grab a token under the new (10.0+ v4 API):
#
# It is written in the beaker DSL

require 'json'

# A puppet manifest to create a json file  for the API query
oauth_json_pp= <<-PP 
  # passgen() is a simplib function
  $pw = passgen( "simp_gitlab_${trusted['certname']}" )
  $json = "{\\"grant_type\\": \\"password\\", \\"username\\": \\"root\\", \\"password\\": \\"${pw}\\"}"
  file{ '/root/ouath_json.template':
    content => $json
  }
PP

# template the JSON payload
apply_manifest_on(gitlab_server, oauth_json_pp, :catch_failures => true, :environment => env_vars)

# use the payload on the API
_r = on(gitlab_server, "curl https://#{gitlab_server.node_name}/oauth/token --capath /etc/pki/simp-testing/pki/cacerts/ -d @/root/ouath_json.template  --header 'Content-Type: application/json' ")

expect(_r.exit_code_in? [0,2]).to be true

# Here's the tocken!
token_data = JSON.parse(_r.stdout)