Merge ~gabrielcocenza/charm-juju-lint:deprecation into charm-juju-lint:master

[Gabriel Cocenza]

added deprecation logs and status for juju-lint as a principal charm.

[🤖 Canonical IS Merge Bot (canonical-is-mergebot)]

This merge proposal is being monitored by mergebot. Change the status to Approved to merge.

[🤖 prod-jenkaas-bootstack (prod-jenkaas-bootstack)]

PASSED: Continuous integration, rev:0c66318653d432e485b07c0137c7cc4df826908c
https://jenkins.canonical.com/bootstack/job/lp-charm-juju-lint-ci/30/
Executed test runs:
    SUCCESS: https://jenkins.canonical.com/bootstack/job/lp-charm-test-functest/2110/
    None: https://jenkins.canonical.com/bootstack/job/lp-update-mp/1950/

Click here to trigger a rebuild:
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review: Approve (continuous-integration)

[Andrea Ieri (aieri)]

small nit, lgtm otherwise

review: Approve

[🤖 prod-jenkaas-bootstack (prod-jenkaas-bootstack)]

PASSED: Continuous integration, rev:c0bcb4ea87d487b7c0c685be86405cd037a3d96d
https://jenkins.canonical.com/bootstack/job/lp-charm-juju-lint-ci/32/
Executed test runs:
    SUCCESS: https://jenkins.canonical.com/bootstack/job/lp-charm-test-functest/2112/
    None: https://jenkins.canonical.com/bootstack/job/lp-update-mp/1952/

Click here to trigger a rebuild:
https://jenkins.canonical.com/bootstack/job/lp-charm-juju-lint-ci/32//rebuild

review: Approve (continuous-integration)

[🤖 Canonical IS Merge Bot (canonical-is-mergebot)]

Change successfully merged at revision 7c340a4a57957a5dc16e3888c5d6715c105dd11e

diff --git a/src/charm.py b/src/charm.py
index d6c1b69..8518f9b 100755
--- a/src/charm.py
+++ b/src/charm.py
@@ -9,6 +9,7 @@ import logging
 from ops.charm import CharmBase
 from ops.framework import StoredState
 from ops.main import main
+from ops.model import ActiveStatus
 
 from lib_jujulint import JujuLintHelper
 
@@ -37,6 +38,23 @@ class JujuLintCharm(CharmBase):
             self.on.nrpe_external_master_relation_changed,
             self.on_nem_changed,
         )
+        self.framework.observe(self.on.update_status, self.on_update_status)
+
+    # NOTE(gabrielcocenza) This should be removed in the next release
+    # that the charm is subordinate.
+    def on_update_status(self, event):
+        """Set deprecation logs and status."""
+        logging.warning("Juju-Lint as principal charm has been deprecated")
+        logging.warning(
+            (
+                "To upgrade the charm you should re-deploy it as subordinate. "
+                "See the readme on the project for more details"
+            )
+        )
+        if self.helper.verify_config():
+            self.model.unit.status = ActiveStatus(
+                "Deprecated. See instructions on README"
+            )
 
     def on_upgrade_charm(self, event):
         """Handle upgrade and resource updates."""