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My specific case is for getting the amazon EC2 authentication information stored in the environments.yaml.
I am aware of the get-constraints command available in recent Juju builds. Can this be used to access this information?

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Try referring here jujucharms.com/docs/index.html –  atenz Aug 2 '12 at 8:53

2 Answers 2

up vote 2 down vote accepted

Try passing the information you need as config parameters for the charm.

To do this, you'd:

  • add parameter names into the charm's config.yaml file

  • either pass the keys in as a --config part of the juju deploy command or alternatively using the juju set command

  • read the keys from the charm hooks using the config-get command

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I am automating the juju commands so it is more suitable to use --config switch than calling set .Also I need the parameters within in the install and xxx-relation-added hooks. –  Antojk Aug 3 '12 at 10:16

At this time you can not access Environment varaibables. If your charm requires authentication information you'll need to add it as a configuration option for that Charm (Charms should be designed to deploy on all stacks, so not every provider will have something like an ec2-authentication key). If you require AWS services in your charm consider exposing those in the configuration with something like this:

options:
  aws-public-key:
    type: string
    default: ""
    description: Amazon Public Key for S3
  aws-secret-key:
    type: string
    default: ""
    description: Amazon Secret Key for S3
  s3-bucket:
    type: string
    default: ""
    description: Amazon S3 Bucket

So these would be set using the juju setcommand and would be available in the config_changed hook via config-get

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I have used the config.yaml to preset the variables –  Antojk Aug 3 '12 at 10:20

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