Add basic system check for uwsgi

src/olympia/core/apps.py

@@ -1,14 +1,35 @@
 import logging
+import subprocess
 import warnings
 
 from django.apps import AppConfig
 from django.conf import settings
+from django.core.checks import Error, Tags, register
 from django.utils.translation import gettext_lazy as _
 
 
 log = logging.getLogger('z.startup')
 
 
+class CustomTags(Tags):
+    custom_setup = 'setup'
+
+
+@register(CustomTags.custom_setup)
+def uwsgi_check(app_configs, **kwargs):
+    errors = []
+    command = ['uwsgi', '--version']
+    result = subprocess.run(command, capture_output=True)
+    if result.returncode != 0:
+        errors.append(
+            Error(
+                f'{" ".join(command)} returned a non-zero value',
+                id='setup.E001',
+            )
+        )
+    return errors
+
+
 class CoreConfig(AppConfig):
     name = 'olympia.core'
     verbose_name = _('Core')

src/olympia/core/tests/test_apps.py

@@ -0,0 +1,17 @@
+from unittest import mock
+
+from django.core.management import call_command
+from django.core.management.base import SystemCheckError
+from django.test import SimpleTestCase
+
+
+class SystemCheckIntegrationTest(SimpleTestCase):
+    def test_uwsgi_check(self):
+        call_command('check')
+
+        with mock.patch('olympia.core.apps.subprocess') as subprocess:
+            subprocess.run.return_value.returncode = 127
+            with self.assertRaisesMessage(
+                SystemCheckError, 'uwsgi --version returned a non-zero value'
+            ):
+                call_command('check')