juju deploy --dry-run does not catch relations error in bundle

[Nicolas Pochet]

When deploying (or applying a new config to an existing model) a bundle some might want to ensure that everything is correct.
To do so, we can use the --dry-run flag.
When doing so, juju does not validate the relations as it does it without the --dry-run flag.
For example, if we take this simple bundle:

applications:
  ubuntu:
    charm: cs:ubuntu
  nrpe:
    charm: cs:nrpe

relations:
  - ["nrpe:foo", "ubuntu:foo"]

The ubuntu charm does not have the foo option. If we try to validate the bundle with juju deploy --dry-run, we get the following output:

juju deploy bundle.yaml --dry-run
Resolving charm: cs:nrpe
Resolving charm: cs:ubuntu
Changes to deploy bundle:
- upload charm cs:nrpe-57
- deploy application nrpe using cs:nrpe-57
- upload charm cs:ubuntu-12
- deploy application ubuntu using cs:ubuntu-12
- add relation nrpe:foo - ubuntu:foo

Everything seems to be fine according to juju.
If we want to deploy, without dry-run, then we get the error that we expect:

juju deploy bundle.yaml
Resolving charm: cs:nrpe
Resolving charm: cs:ubuntu
Executing changes:
- upload charm cs:nrpe-57
- deploy application nrpe using cs:nrpe-57
- upload charm cs:ubuntu-12
- deploy application ubuntu using cs:ubuntu-12
- add relation nrpe:foo - ubuntu:foo
ERROR cannot deploy bundle: cannot add relation between "nrpe:foo" and "ubuntu:foo": application "nrpe" has no "foo" relation

[Canonical Juju QA Bot (juju-qa-bot)]

This bug has not been updated in 2 years, so we're marking it Low importance. If you believe this is incorrect, please update the importance.