Installing content packs

[joschi]

When installing a specific version of a content pack, Graylog needs to do the following things:

• Ask user for parameters defined in content pack
• Check validity of version constraints
• Check validity of provided parameters
• Resolve dependencies of the described entities
• Create entities in the correct order
  • If a "singleton" entity already exists, use the existing instance (e. g. Grok pattern, lookup data adapter, lookup cache)
  • Create a mapping of the content pack entity IDs to the actual database IDs
  • In case of an error: Remove all newly created entities in reverse order
  • In case of success: Create a "snapshot" of the content pack instance, the parameters, and the actual entity references (ID?) so that modified entities can be detected later

[bernd]

This is done.