new_contents: #!/usr/bin/env python3
  """
  Simple script that generates hosts files usable with dsh/pssh
  for runnign administrative actions on all hosts in a particular
  labs project. Salt is just way too unreliable to be useful
  for this purpose.
  
  Hits the wikitech API.
  
  You can execute commands via pssh like:
  
      pssh -t0 -p4 -h <hostgroup> '<command>'
  
  This sets parallelism to 4, tweak as necessary.
  """
  import json
  import sys
  from urllib.request import urlopen
  
  
  project_spec = sys.argv[1]
  
  if project_spec == 'all-instances':
      projects_url = 'https://wikitech.wikimedia.org/w/api.php?action=query&list=novaprojects&format=json'
      projects = json.loads(urlopen(projects_url).read().decode('utf-8'))['query']['novaprojects']
  else:
      projects = [project_spec]
  
  instances = []
  for project_name in projects:
      api_url = 'https://wikitech.wikimedia.org/w/api.php' \
                '?action=query&list=novainstances&niregion=eqiad&format=json' \
                '&niproject=%s' % project_name
  
      data = json.loads(urlopen(api_url).read().decode('utf-8'))
      for instance in data['query']['novainstances']:
          instances.append(instance['name'] + ".eqiad.wmflabs")
  
  with open(project_spec, 'w') as f:
      f.write("\n".join(instances))
  
subject: Add script to generate list of instances in any project