Error on ingress removed

[shipperizer]

Bug Description

charm doesn't behave nicely on ingress remove hook

To Reproduce

create a tfvars file with the following:

idp_provider_config = {
  client_id   = " ********************************************"
  provider    = "github"
  provider_id = "github_cccca7a7a3666c2bc336a09713596333b5d02fbc"
}

idp_provider_credentials = {
  client_secret = "********************************************"
}

internal_ingress = {
  name     = "traefik-internal"
  endpoint = "ingress"
}

juju_offers = {
  external_ingress_offer = "admin/admin.ingress"
}

model = "test"

hydra = {
  channel = "0.2/stable"
}

kratos = {
  channel = "0.2/stable"
}

login_ui = {
  channel = "0.2/stable"
}

using the terraform module in canonical/iam-bundle-integration on the IAM-838 branch do:

• juju add-model test
• juju add-model admin
• juju deploy traefik-k8s --channel stable traefik-public --model admin
• juju deploy traefik-k8s --channel stable traefik-internal --model test
• juju offer admin.traefik-public:ingress ingress
• terraform apply -var-file
• terraform destroy -var-file

Environment

0.2/stable

Relevant log output

2024-04-29T21:09:55.303Z [container-agent] 2024-04-29 21:09:55 INFO juju.worker.uniter resolver.go:180 awaiting error resolution for "relation-departed" hook
2024-04-29T21:09:55.856Z [container-agent] 2024-04-29 21:09:55 ERROR juju-log admin-ingress:10: Uncaught exception while in charm code:
2024-04-29T21:09:55.856Z [container-agent] Traceback (most recent call last):
2024-04-29T21:09:55.856Z [container-agent]   File "/var/lib/juju/agents/unit-kratos-0/charm/venv/ops/model.py", line 3019, in _run
2024-04-29T21:09:55.856Z [container-agent]     result = subprocess.run(args, **kwargs)  # type: ignore
2024-04-29T21:09:55.856Z [container-agent]   File "/usr/lib/python3.10/subprocess.py", line 526, in run
2024-04-29T21:09:55.856Z [container-agent]     raise CalledProcessError(retcode, process.args,
2024-04-29T21:09:55.856Z [container-agent] subprocess.CalledProcessError: Command '('/var/lib/juju/tools/unit-kratos-0/relation-set', '-r', '14', '--app', '--file', '-')' returned non-zero exit status 2.
2024-04-29T21:09:55.856Z [container-agent] 
2024-04-29T21:09:55.856Z [container-agent] The above exception was the direct cause of the following exception:
2024-04-29T21:09:55.856Z [container-agent] 
2024-04-29T21:09:55.856Z [container-agent] Traceback (most recent call last):
2024-04-29T21:09:55.856Z [container-agent]   File "/var/lib/juju/agents/unit-kratos-0/charm/venv/ops/model.py", line 3124, in relation_set
2024-04-29T21:09:55.856Z [container-agent]     self._run(*args, input_stream=content)
2024-04-29T21:09:55.856Z [container-agent]   File "/var/lib/juju/agents/unit-kratos-0/charm/venv/ops/model.py", line 3021, in _run
2024-04-29T21:09:55.856Z [container-agent]     raise ModelError(e.stderr) from e
2024-04-29T21:09:55.856Z [container-agent] ops.model.ModelError: ERROR invalid value "14" for option -r: relation not found
2024-04-29T21:09:55.856Z [container-agent] 
2024-04-29T21:09:55.856Z [container-agent] 
2024-04-29T21:09:55.856Z [container-agent] The above exception was the direct cause of the following exception:
2024-04-29T21:09:55.856Z [container-agent] 
2024-04-29T21:09:55.856Z [container-agent] Traceback (most recent call last):
2024-04-29T21:09:55.856Z [container-agent]   File "/var/lib/juju/agents/unit-kratos-0/charm/./src/charm.py", line 1075, in <module>
2024-04-29T21:09:55.856Z [container-agent]     main(KratosCharm)
2024-04-29T21:09:55.856Z [container-agent]   File "/var/lib/juju/agents/unit-kratos-0/charm/venv/ops/main.py", line 454, in main
2024-04-29T21:09:55.856Z [container-agent]     framework.reemit()
2024-04-29T21:09:55.856Z [container-agent]   File "/var/lib/juju/agents/unit-kratos-0/charm/venv/ops/framework.py", line 863, in reemit
2024-04-29T21:09:55.856Z [container-agent]     self._reemit()
2024-04-29T21:09:55.856Z [container-agent]   File "/var/lib/juju/agents/unit-kratos-0/charm/venv/ops/framework.py", line 943, in _reemit
2024-04-29T21:09:55.856Z [container-agent]     custom_handler(event)
2024-04-29T21:09:55.856Z [container-agent]   File "/var/lib/juju/agents/unit-kratos-0/charm/./src/charm.py", line 894, in _on_client_config_changed
2024-04-29T21:09:55.856Z [container-agent]     self.external_provider.set_relation_registered_provider(
2024-04-29T21:09:55.856Z [container-agent]   File "/var/lib/juju/agents/unit-kratos-0/charm/lib/charms/kratos_external_idp_integrator/v0/kratos_external_provider.py", line 763, in set_relation_registered_provider
2024-04-29T21:09:55.856Z [container-agent]     relation.data[self.model.app].update(data)
2024-04-29T21:09:55.856Z [container-agent]   File "/usr/lib/python3.10/_collections_abc.py", line 999, in update
2024-04-29T21:09:55.856Z [container-agent]     self[key] = other[key]
2024-04-29T21:09:55.856Z [container-agent]   File "/var/lib/juju/agents/unit-kratos-0/charm/venv/ops/model.py", line 1687, in __setitem__
2024-04-29T21:09:55.856Z [container-agent]     self._commit(key, value)
2024-04-29T21:09:55.856Z [container-agent]   File "/var/lib/juju/agents/unit-kratos-0/charm/venv/ops/model.py", line 1691, in _commit
2024-04-29T21:09:55.857Z [container-agent]     self._backend.update_relation_data(self.relation.id, self._entity, key, value)
2024-04-29T21:09:55.857Z [container-agent]   File "/var/lib/juju/agents/unit-kratos-0/charm/venv/ops/model.py", line 3355, in update_relation_data
2024-04-29T21:09:55.857Z [container-agent]     self.relation_set(relation_id, key, value, isinstance(_entity, Application))
2024-04-29T21:09:55.857Z [container-agent]   File "/var/lib/juju/agents/unit-kratos-0/charm/venv/ops/model.py", line 3127, in relation_set
2024-04-29T21:09:55.857Z [container-agent]     raise RelationNotFoundError() from e
2024-04-29T21:09:55.857Z [container-agent] ops.model.RelationNotFoundError

Additional context

No response

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The internal ticket has been created: https://warthogs.atlassian.net/browse/IAM-865.

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