refresh: log snapd response text when v2/snaps/{snap} fails

Signed-off-by: Olivier Gayot <olivier.gayot@canonical.com>

subiquity/server/controllers/refresh.py

@@ -214,9 +214,15 @@ class RefreshController(SubiquityController):
 
     @with_context()
     async def start_update(self, context):
-        change_id = await self.app.snapdapi.v2.snaps[self.snap_name].POST(
+        try:
-            SnapActionRequest(action=SnapAction.REFRESH, ignore_running=True)
+            change_id = await self.app.snapdapi.v2.snaps[self.snap_name].POST(
-        )
+                SnapActionRequest(action=SnapAction.REFRESH, ignore_running=True)
+            )
+        except requests.exceptions.HTTPError as http_err:
+            log.warning(
+                "v2/snaps/%s returned %s", self.snap_name, http_err.response.text
+            )
+            raise
         context.description = "change id: {}".format(change_id)
         return change_id
 

subiquity/server/controllers/tests/test_refresh.py

@@ -16,12 +16,14 @@
 from unittest import mock
 
 import jsonschema
+import requests
+import requests_mock
 from jsonschema.validators import validator_for
 
 from subiquity.server import snapdapi
 from subiquity.server.controllers import refresh as refresh_mod
 from subiquity.server.controllers.refresh import RefreshController, SnapChannelSource
-from subiquitycore.snapd import AsyncSnapd, get_fake_connection
+from subiquitycore.snapd import AsyncSnapd, SnapdConnection, get_fake_connection
 from subiquitycore.tests import SubiTestCase
 from subiquitycore.tests.mocks import make_app
 
@@ -111,3 +113,31 @@ class TestRefreshController(SubiTestCase):
         )
 
         JsonValidator.check_schema(RefreshController.autoinstall_schema)
+
+    async def test_start_update_api_error_logged(self):
+        self.app.snapdapi = snapdapi.make_api_client(
+            AsyncSnapd(SnapdConnection(root="/inexistent", sock="snapd"))
+        )
+        json_body = {
+            "type": "error",
+            "status-code": 409,
+            "status": "Conflict",
+            "result": {
+                "message": 'snap "subiquity" has "update" change in progress',
+            },
+        }
+        requests_mocker = requests_mock.Mocker()
+        requests_mocker.post(
+            "http+unix://snapd/v2/snaps/subiquity",
+            json=json_body,
+            status_code=409,
+        )
+
+        with requests_mocker:
+            with self.assertRaises(requests.exceptions.HTTPError):
+                with self.assertLogs(
+                    "subiquity.server.controllers.refresh", level="WARNING"
+                ) as logs:
+                    await self.rc.start_update()
+
+            self.assertIn('snap \\"subiquity\\" has \\"update\\"', logs.output[0])