Relations with subordinate services can be added multiple times

[David Britton]

In the case of subordinate services that are joined to a principal with no interface, the relation can be added multiple times on the same unit, which seems to go against the idea of a relation in other parts of juju. I asked quicky in #juju on freenode and was told this seems like a bug.

Here is a console interaction to repeat the problem.

$ juju deploy ubuntu
2013-02-05 16:42:06,899 INFO Searching for charm cs:precise/ubuntu in charm store
2013-02-05 16:42:08,438 INFO Charm deployed as service: 'ubuntu'
2013-02-05 16:42:08,438 INFO 'deploy' command finished successfully
$ mkdir precise
$ cd precise; bzr branch lp:~charmers/charms/precise/landscape-client/trunk landscape-client; cd -
$ juju deploy --repository . local:precise/landscape-client
2013-02-05 16:48:43,887 INFO Searching for charm local:precise/landscape-client in local charm repository: /home/dpb/src
2013-02-05 16:48:44,086 INFO Subordinate 'landscape-client' awaiting relationship to principal for deployment.
2013-02-05 16:48:44,086 INFO Charm deployed as service: 'landscape-client'
2013-02-05 16:48:44,087 INFO 'deploy' command finished successfully
$ juju add-relation landscape-client ubuntu
2013-02-05 16:48:57,195 INFO Added juju-info relation to all service units.
2013-02-05 16:48:57,195 INFO 'add_relation' command finished successfully
$ juju add-relation landscape-client ubuntu
2013-02-05 16:48:59,044 INFO Added juju-info relation to all service units.
2013-02-05 16:48:59,044 INFO 'add_relation' command finished successfully
$ juju status
machines:
  0:
    agent-state: running
    dns-name: localhost
    instance-id: local
    instance-state: running
services:
  landscape-client:
    charm: local:precise/landscape-client-5
    relations:
      juju-info:
      - ubuntu
    subordinate: true
    subordinate-to:
    - ubuntu
  ubuntu:
    charm: cs:precise/ubuntu-0
    relations:
      juju-info:
      - landscape-client
    units:
      ubuntu/0:
        agent-state: started
        machine: 0
        public-address: 10.0.3.66
        subordinates:
          landscape-client/0:
            agent-state: started
          landscape-client/1:
            agent-state: started

Notice both landscape-client/0 and landscape-client/1 are "connected" the principal ubuntu/0

[Marius B. Kotsbak (mariusko)]

I saw this also, and had problems removing the extra relations.

[Marius B. Kotsbak (mariusko)]

"juju remove-relation XXX-extra-packages XXX"

gives:

"ERROR Unsupported attempt to destroy subordinate service 'XXX' while principal service 'XXX-extra-packages' is related"

[Marius B. Kotsbak (mariusko)]

Fixed in PPA: "ERROR Relation juju-info already exists between A and B".